четверг, 15 марта 2012 г.

What we like about Yoo

Film rocks out with new kind of screen teen

Aaron Yoo is a pretty lucky guy. In the past 16 months alone, he's scammed casino bigwigs in Vegas with a gang of collegiate card sharks ("21"), played amateur suburban sleuth alongside cute "it-boy" ShiaLaBeouf ("Disturbia") and, in his latest cinematic romp, Yoo gets to jam with his best pals in a queercore band on Manhattan's �ber-hip Lower East Side, then rage around the Big Apple all night in pursuit of drunken friends and indie rockers, all in the name of true love. It's not a bad way to spend a year, eh?

OK, maybe Yoo's high-profile hijinks are all Hollywood make-believe, but the LA.based Yoo is definitely on a roll. And his …

EasyJet, Ryanair airlines threaten to withhold portion of airport fees

Low-cost airlines easyJet and Ryanair threatened Tuesday to withhold part of the landing charges they pay airport owner BAA while they challenge the latest fee increases in court.

EasyJet chief executive Andy Harrison said his airline will hold back paying some of the 21 percent increase in charges at London's Gatwick airport until a court reviews fee increases that took effect on April 1.

"We are determined to address a regulatory decision which we consider to be unlawful and damaging for the airlines, our passengers and the industry as a whole," Harrison wrote in a letter to BAA.

Ryanair chief executive Michael O'Leary said his …

Never a cross word from ralph

I Had great difficulty solving last week's Chronicle 'QuickCrossword', which still usually managed to complete, with the help ofsome 'thesaurus', in around an hour or two.

This evening, I managed to complete the crossword in just over aquarter of an hour, with just one word causing me consternation. The word was, 'testimony', which turned into, 'evidence'.

Obviously, your normal crossword puzzle setter was on holiday lastweek, much to my chagrin and …

среда, 14 марта 2012 г.

U.S., Pakistan resume non-proliferation talks

Reviving non-proliferation talks dormant since February 1999, Pakistani Foreign Minister Abdul Sattar visited Washington June 15 to meet with Deputy Secretary of State Strobe Talbott and other high-level U.S. officials. Initiated after the May 1998 Indian-Pakistani nuclear tests, the talks, which have also been undertaken with India, have produced little concrete progress to date. Instability on the subcontinent-including the April 1999 fall of the Indian government, ongoing Indian-Pakistani fighting in Kashmir, and the October 1999 coup that ousted Pakistani Prime Minister Nawaz Sharif-contributed to the long lapse since the last meeting.

The latest round of talks covered a wide …

Garrett still thrilled about '94 Thanksgiving win

IRVING, Texas (AP) — Knocking off the reigning Super Bowl champion New Orleans Saints for his third straight win since taking over the Dallas Cowboys would be one heck of a Thanksgiving feat for Jason Garrett.

It just wouldn't be his best.

That distinction will always belong to Nov. 24, 1994, when Garrett filled in for injured starter Troy Aikman and ailing backup Rodney Peete to rally the two-time Super Bowl champion Cowboys to a 42-31 victory over Brett Favre, Reggie White and the Green Bay Packers.

"I'll never forget just how much they rallied around this guy who probably wasn't good enough, to be honest with you," Garrett said. "It was a fun day."

In his …

Hurricane propels Jackson's justice quest at EPA

More than four years after Hurricane Katrina, the single-story brick rancher in Pontchartrain Park where Lisa Perez Jackson grew up stands empty.

Floodwaters long ago ate away the walls of her corner bedroom, where the current head of the Environmental Protection Agency once hung Michael Jackson and Prince posters and studied her way to the top of her high school class.

Faded spray paint, left by search teams to indicate that no bodies were found, serves as a reminder of the day Jackson evacuated her mother, Marie, to Bossier City ahead of the approaching storm.

Katrina was the closest that an environmental disaster had hit home for someone who has …

Hinsdale South OL Pape to shun early commitment

You don't want to miss this matchup.

On one side is Tony Pape, Hinsdale South's 6-7, 290-poundoffensive tackle. He is the top-rated football prospect in theChicago area for 1998.

On the other side is Michigan coach Lloyd Carr. When the Mayevaluation period begins next weekend, he plans to offer Pape ascholarship. It's an offer he doesn't think Pape can refuse.But Pape insists he won't make an early commitment. He wants toenjoy his senior season, then select five colleges to visit beforemaking a decision in time for the February signing period.So when Carr calls next week, Pape will tell him that he isinterested in visiting Michigan - and UCLA, Ohio State and …

Slain US activist's parents seek justice in Israel

JERUSALEM (AP) — The parents of a young American activist crushed to death by an Israeli bulldozer seven years ago as she tried to save a Palestinian home from demolition never saw the soldier who killed her or his commanders put on trial or punished.

Instead, they have spent years battling in Israeli courts for two modest goals they hope might give them some closure: an apology from the military and a chance to look their daughter's killer in the eye in court.

They suffered a setback in their quest last week when an Israeli judge declined one of their key requests. The driver and his commander are expected to testify in the family's civil trial against the Israeli government …

UK hires executive to handle sale of bank shares

A British government agency has hired an executive from Bank of America Merrill Lynch to supervise the sale of government shares in two bailed-out banks.

UK Financial Investments Ltd., which holds the government stakes in Royal Bank of Scotland Group and Lloyds Banking Group, said it has hired Jim O'Neil as its head of Market Investments …

VBS troupe hitting the road this summer

Mennonite Church

Saskatchewan

A group of six teenagers (Carissa Feick, Michael Bueckert, Lenora Epp, Joel Bueckert, Wendy Luitjens and Ashley Wiebe), together with adult staff, will be seeing a lot of Saskatchewan this summer.

The teens are working as a Vacation Bible School (VBS) troupe to help churches carry out VBS programs over the summer. They are going to congregations that need assistance in setting up a program.

The conference in Edmonton will be the first stop for the troupe, after which it will visit …

English Soccer Capsules

A brief look at Saturday's Premier League soccer games (home teams listed first):

Arsenal 1, Birmingham 1 (1-0)

Birmingham became just the second team to avoid Premier League defeat at Arsenal this season, rallying to a 1-1 draw that forced the Gunners down into second place.

Eduardo da Silva headed wide and Emmanuel Adebayor went close for Arsenal, but Birmingham spurned the first clear chance when Manuel Almunia saved a low shot into the corner from Cameron Jerome.

Adebayor then put the home team ahead in the 21st minute with a penalty kick after Stephen Kelly had tackled Eduardo from behind.

Olivier Kapo's appeals for a …

Appeals court upholds NY forced labor conviction

A federal appeals court on Thursday upheld the convictions of a suburban New York couple accused of enslaving two Indonesian housekeepers, finding they received a fair trial in a case that put a spotlight on domestic worker abuse in America.

The 2nd U.S. Circuit Court of Appeals in Manhattan rejected arguments by attorneys for Mahender and Varsha Sabhnani that sought to overturn their forced-labor convictions. It also ordered a recalculation of restitution requiring each of them to pay $936,546 to their victims. The appeals court found that the lower court judge erred in awarding overtime pay.

Varsha Sabhnani's lawyer had argued that prejudicial publicity …

Welsh quits as Hofstra hoops coach after arrest

Hofstra basketball coach Tim Welsh resigned Monday, three days after he was charged with drunken driving and only a month after he was hired.

Welsh, a former coach at Iona and Providence, never worked a game at Hofstra after signing a five-year contract for $3 million to replace Tom Pecora, who left to coach Fordham in March.

"The university accepted the resignation in the best interests of the university and of the men's basketball program," Hofstra spokesman Stephen Gorchov said in a statement.

There was no immediate word from the school on a successor.

The 49-year-old Welsh was arrested Friday morning after Nassau County police found him behind the wheel of his 2006 Lexus, stopped at a green light at an intersection in Levittown at 1 a.m. He pleaded not guilty at his arraignment and is due back in district court Tuesday.

Welsh's voicemail box was full. His attorney did not immediately return a call.

Welsh told Newsday in Saturday's editions that he wanted to "express the deepest regrets and apologies over the incident."

Welsh took over a program Pecora led to a 155-126 record in nine seasons, including three straight NIT appearances from 2005-07.

Welsh was fired by Providence in 2008 after 10 seasons, and spent the past two years as a basketball commentator for ESPN.

At Providence, he had an overall record of 160-143, bu was 1-9 in the Big East tournament. The Friars reached the NCAA tournament under Welsh in 2001 and 2004, losing in the first round both times.

His best season at Providence was 2003-04 when the Friars finished third in the Big East and were ranked as high as No. 12 in the country. Before Providence he spent three seasons at Iona, where his record was 70-22 with one NCAA and two NIT appearances.

Hofstra joined the Colonial Athletic Association in 2001. While it has had success on the court, the Pride have not been able to reach the NCAA tournament as a member.

Welsh is accused of aggravated driving while intoxicated, which means prosecutors contend he had a blood-alcohol reading over 0.18, more than double the legal limit of 0.08.

His arrest occurred in a county where the district attorney has built a reputation for zero tolerance on drunken driving. During her first term, Kathleen Rice obtained a rare murder conviction against a drunken driver who crashed head-on into a wedding limousine, killing a 7-year-old flower girl and the chauffer.

Marge Lee, an anti-DWI advocate whose daughter was killed in a drunken driving crash, said high-profile arrests like Welsh's help to focus attention on the issue.

"Unfortunately, everyday drunken driving arrests are not always in the paper," she said. "If every single arrest made this kind of headline, it might help bring an end to the problem. A better headline would be `drunken driving is over.'"

___

Associated Press Basketball Writer Jim O'Connell contributed to this report.

вторник, 13 марта 2012 г.

NO-HITTERS BY ANGELS

Mark Langston and Mike Witt combined to beat the Mariners 1-0Wednesday night for the Angels' eighth no-hitter. Nolan Ryan tossedfour of his record five no-hitters in an Angels uniform. Year, Pitcher No-hitter

1962 Bo Belinsky beat Orioles 2-0 1970 Clyde Wright beat A's 4-0 1973 Nolan Ryan beat Royals 3-0 1973 Nolan Ryan beat Tigers 6-0 1974 Nolan Ryan beat Twins 4-0 1975 Nolan Ryan beat Orioles 1-0 1984 Mike Witt beat Rangers 1-0 1990 Langston-Witt beat Mariners 1-0 -Perfect game

Horror stories fuel Yugoslav strife // Propaganda war keeps hatred at battle pitch

SISAK, Yugoslavia Tales of massacres and mutiliation are emergingin Croatia's bloody ethnic conflict, feeding growing fury betweenSerbs and Croats and diminishing the chances for peace.

Stories of gruesome bloodletting have become central ingredientsof an unrelenting propaganda war. Details are often difficult tosubstantiate, but their existence has stirred deep emotions.

Croatian newspapers have reported - and Western journalistsconfirmed - that a human shield of Croatian villagers was forced tomarch ahead of ethnic Serbian militiamen as they fired their guns atCroatian forces late last week.

Croatian police in the village of Struga apparently did notshoot back, fearing they would hit the women, children and elderlyshielding the Serbs, reports said.

Serbian newspapers also run horror tales or reports designed toblacken Croatian authorities and police forces.

A recent newspaper headline said that 400 "Ustashas" had beenkilled during fighting. Ustashas were Croatian fascist extremistswho set up a Nazi puppet state in Yugoslavia.

Much of the Serbian media refer to the Croatian government andits security forces as "Ustasha" and tend to inflate the number ofCroatians killed in battles.

More than 50 people have been killed in Croatia since last week,mainly in clashes between Croatian forces and ethnic Serbs, whooppose the republic's secession and seek to join neighboring Serbia.Croatia and the neighboring republic Slovenia declared independenceJune 25.

European Community officials arrived Wednesday seeking a trucein Croatia, and the eight-member presidency tried again to reach anaccord in the republic. But heightened violence and greaterinvolvement by Serb-led federal troops have fed fears of all-outcivil war.

A cease-fire declaration last Friday was followed by thebloodiest weekend since June 25, with death toll estimates rangingfrom 30 to 180. Serbian nationalists, supported by Serbia, haveseized control of seven Croatian villages in the republic and havenot shown willingness to end the fighting in which they have theupper hand.

The Croatian government on Tuesday played a tape of crying womenfrom Struga and other villages south of the capital, Zagreb.

"The (Serbian) terrorists destroyed everything and killed atrandom," said a Croatian women.

"They were shooting and burning houses, killing people andcattle," another woman said on the tape, played at a pressconference.

People interviewed by a Croatian reporter also spoke of rapesand killings with knives and bayonets by Serbs. They claimed theSerbs mutilated dead bodies and carved out eyes.

The tape, first carried by Croatian radio, did not give names ofthose interviewed.

Struga is a village with a Serbian minority, about 60 milessouth of Zagreb. Dozens of Croatians have fled from the town in thelast three days.

In nearby Sisak, Mate Piskor, a reporter for the leadingCroatian daily, Vjesnik, said ethnic Serbian forces were only threemiles from the city.

An estimated 1,000 civilians and Croat guardsmen were fleeing toSisak from the town of Kostajnica in a 3 1/2-mile convoy Wednesdaynight. Kostajnica was reportedly bombed Tuesday by the Yugoslav AirForce.

Profits embolden US companies, but revenue lacking

Corporate America is turning a profit again, but only by spending less, not making more.

While recent bullish profit reports have fueled the stock market, a true economic revival will depend on consumers opening their wallets. So far, there's little evidence of that.

Big names such as Caterpillar, IBM, Whirlpool, Pfizer, 3M and Lowe's boosted profit forecasts for 2009 following a slew of second-quarter earning reports that blew past lackluster expectations. Yet the gains aren't coming from sales.

Rather, companies are slashing everything from jobs to officer perks to boost the bottom line and please investors who have responded by pushing the major stock indexes to their highest levels in months.

None of this is surprising coming out of a recession. But the increase in the major stock indexes is raising questions about whether investors are getting ahead of themselves. Companies can only cut costs so much, and the profits and the stock surge aren't likely to last without a sustained economic recovery that puts people in the mood to spend again.

"Cost saving is not going to be the source of future earnings," said Fred Fraenkel, vice chairman of the Beacon Trust Company, an investment management firm. "The source is going to be revenue, and that can't happen until the economy starts growing."

Many companies are taking steps that could lead to even better year-over-year earnings growth in the third and fourth quarters. Last year, companies were unprepared for the plunge in consumer spending that followed the credit crisis and stock market collapse in September and October. Revenue fell sharply, but there wasn't enough time to cut costs, so profits tumbled.

Now, months of cost reductions are paying off, and investors are eating it up. The Standard & Poor's 500 stock index has shot up 44 percent since early March, while the Dow Jones industrials jumped above 9,000 Thursday for the first time since early January. On Friday, the Dow rose 23.95, or 0.3 percent, to 9,093.24.

Edward Yardeni, an independent market analyst, said the rally is justified. "But if all these companies do is cut costs and they can't find ways to expand revenue, all they're doing is shrinking and that's not bullish," he said.

Companies have cut spending in big and small ways. At Google, employees no longer get free bottled water. Starbucks, meanwhile, has shuttered hundreds of stores.

The frugality is paying off. Of the nearly one-third of the nation's largest companies that have reported second-quarter earnings so far, 76 percent have topped analyst expectations, according to Thomson Reuters.

And despite the severity of the downturn, less than a fifth of U.S. companies are losing money, according to Cary Leahey, an economist at consulting firm Decision Economics.

"They've done extraordinary belt-tightening," he said.

For earnings to keep rising, consumers must start spending again. And unless economic activity overseas improves, U.S. companies that do business abroad will continue to suffer, dragging down everyone.

The dismal spending climate has hurt big companies like Microsoft and Amazon.com, which reported disappointing quarterly earnings Thursday.

At IBM, layoffs, automation and other cost-cutting measures helped the company small quarterly earnings projections last week. The revenue picture was less encouraging. IBM's sales dropped 13 percent to $23.25 billion, below the $23.59 billion predicted by analysts. Still, the company raised its full-year profit forecast.

"Bottom line, the changes to the company have allowed us to deliver strong performance in a tough environment," IBM chief financial officer Mark Loughridge told analysts, predicting the company will "come out even stronger when the economy improves."

Ford Motor Co. notched a $2.3 billion profit in the second quarter, a year after suffering the worst loss in company history. The surprise gains came as the struggling Detroit automaker reduced debt and trimmed its payroll, including 1,000 blue-collar job cuts through buyout and early retirement offers.

"Without those measures, they'd be in an entirely different situation as a company," said Aaron Bragman, an analyst for the consulting firm IHS Global Insight. He noted Ford had little choice to cut back to offset flagging sales, which fell 14 percent in June compared to the same month last year.

Even the battered banking industry is joining the earnings bonanza, with Wells Fargo & Co., Bank of America Corp. and Citigroup Inc. all posting profitable second quarters.

The gains stand in marked contrast with the stunning losses and financial market upheaval seen only six months ago. Gone are the days when experts fretted about the possibility of another depression. Now the talk centers on whether the economy will recover early next year, and the question is whether it will happen fast enough for many companies.

"Many companies are going to look good now," said Joe Battipaglia, market strategist for private client group at Stifel Nicolaus. But if revenue remain flat and companies run out of ways to save money, "it becomes economic Darwinism where only the strong survive."

___

AP writers Stephen Manning and Chris Rugaber in Washington, Jordan Robertson in San Franscisco and Daniel Lovering in Pittsburgh contributed to this report.

Temple beats Villanova 31-24 on late 43-yard FG

PHILADELPHIA (AP) — Brandon McManus kicked a 43-yard field goal with 8 seconds left to lift Temple to a 31-24 win over defending FCS national champion Villanova on Friday night.

Justin Gildea scored on a 26-yard fumble return on the last play of the game for the Owls. There was a penalty on the play and it took nearly 15 minutes for officials to sort out if the score would stand.

McManus also kicked field goals of 53, 44 and 40 yards in front of more than 32,000 fans, the second-largest crowd to watch the Owls in Lincoln Financial Field. The Owls won the Mayor's Cup presented to the winner of this series.

The Owls went ahead 22-21 on Chester Stewart's 62-yard TD pass to Michael Campbell. Stewart fumbled the snap on the next possession and the Wildcats recovered inside the 25. Nick Yako kicked a 41-yard field goal with 1:56 left that put Villanova up 24-22.

The Owls had circled the date of this game since the schedule was released after the Wildcats beat them last season. Coach Al Golden was quick to note that of all of Temple's milestones last year — first winning season since 1990, first bowl game since 1979 — the Owls failed to beat city rival Villanova.

For most of this one, it looked like the Wildcats would win for the fourth straight time. Villanova's Chris Whitney completed 15 of 17 passes in the first half and finished 17 of 25 for 133 yards with two touchdowns.

His first TD pass was a 3-yarder to Matt Szczur, the Most Outstanding Player in the FCS title game. The two-sport star was drafted by the Chicago Cubs and had a 21-game hitting streak in the minors this year.

Villanova coach Andy Talley rested Szczur to get him fresh for the grueling season ahead. He caught five passes and even completed one.

Aaron Ball's 9-yard run gave Villanova a 14-7 lead in the second quarter.

McManus ended the half with a 54-yard field goal, the second-longest in Temple history. Don Bitterlich hit a 56-yarder in 1975. McManus had plenty of oomph as the ball would have been good from at least 5 more yards out.

The Owls needed all of McManus' kicks to eek out this victory. He hit one in the third quarter and another in the fourth that brought the Owls within five.

Stewart, who made four starts last year, made a perfect pass to Campbell to put Temple ahead. The Owls botched the 2-point conversion. Stewart was 16 for 27 for a career-high 200 yards. Campbell had eight catches for 127 yards.

Years of futility had eroded Temple's fan base until Golden revitalized the program. Fans tailgated outside the Linc, home of the NFL's Eagles, hours before the rare 5 p.m. kickoff. Only a Penn State game in 2007 ever drew more fans.

Select alloys that perform well in sulfuric acid

A variety of stainless steels and high-nickel alloys, as well as carbon steel, meet a wide range of temperatures and concentrations.

Although it is highly corrosive, concentrated sulfuric acid at ambient temperatures is customarily handled in carbon steel equipment. In general, the aggressiveness of the acid varies with its concentration and temperature, its velocity relative to exposed surfaces, and the nature of possible contaminants.

This article examines the behavior of several stainless steel and nickel-bearing alloys (Table 1), taking account of the above variables. Discussion begins with a look at alloys suitable for equipment used in the manufacture of sulfuric acid and in the storage and handling of cold, concentrated commercially-pure acid; then, we present guidelines for the selection of corrosion-resistant materials in processes using sulfuric acid. The following concentration ranges are defined:

This article does not cover concentrations in excess of 98%, e.g., anhydrous, fuming sulfuric acid, or oleum.

The various alloys interact with sulfuric acid in a complex manner. A single process may involve not only a wide range of sulfuric acid concentrations, but also the presence of such contaminants as ferric and cupric ions, nitrates, chlorides, ammonia, sulfur dioxide, and metallic oxides. While the hydrogen ion activity of sulfuric acid attains its maximum at about 5N (25% concentration), its activity diminishes above and below this level. The foregoing variables exert significant influence not only on the oxidizing capacity of sulfuric acid solutions, but also on the performance of stainless steels and nickelbearing alloys in contact with them.

Sulfuric acid manufacture

The past two decades have witnessed major changes in sulfuric acid manufacture. Plants are growing steadily larger and more energy-efficient; they are designed to minimize process energy consumption, while maximizing energy recovery and using steam to generate electricity. The Claus process is rapidly being supplanted by three newer technologies:

1. Combustion of sulfur;

2. Recovery of SO^sub 2^ from metallurgical processes, such as roasting of pyrites and other sulfide ores; and

3. Regeneration from spent acid.

For all three routes, the last two processing steps are catalytic conversion and absorption. The catalytic converter is the most important part of the plant. In it, SO^sub 2^ at about 425 deg C (800 deg F) reacts with excess air in the presence of a catalyst in a multipass operation. Since the reaction is highly exothermic, the gases traverse a cooling chamber after each pass through the catalyst bed. The SO^sub 3^ then enters the absorbing towers where it reacts to form sulfuric acid. About 35% of the heat generated during the process serves to raise the temperature of the sulfuric acid produced. It has been found that in the temperature range 155-190 deg C (310-370 deg F) relatively low corrosion rates prevail for stainless alloys such as American Iron and Steel Institute (AISI) Type 304L - Unified Numbering System (UNS) S30403 and Type 310L (S31003), and for duplex stainless compositions such as Type 2205 (S31803), and for high-silicon modified stainless steel, nominal composition 18% Cr, 18% Ni, 5.5% Si. Figure 1 shows the relevant isocorrosion curves for selected alloys used in the heat-recovery step.

Stainless steel has replaced carbon steel and cast iron as the preferred material of construction for converters and acid coolers. Newer alloys and anodic passivation surface treatments have increased resistance to corrosion by hot acid and oleum. In general, Type 304L is specified for the shell and internals of the converter. Drying towers, acid pump tanks and piping, as well as the acid coolers, are made from silicon-modified stainless steel. As an alternative, anodically protected AISI Type 316L (S31603) stainless steel has become the alloy of choice for acid coolers. Silicon stainless steel works well at acid temperatures higher than those for which anodically protected 316L is recommended. Table 2 provides typical corrosion rates for these and other alloys in 99% sulfuric acid at a temperature of 105-115 deg C (220-240 deg F) in an absorption tower.

Cold, concentrated sulfuric acid

The term "concentrated sulfuric acid" generally refers to the concentration range 90-100%. At concentrations of 93-98%, commercial sulfuric acid can be stored in carbon steel tanks, provided that iron contamination does not present a problem.

Carbon steel provides satisfactory corrosion resistance in the concentration range between 80 and 100% at ambient temperatures in static conditions, and at low velocity. In this service, carbon steel depends for its corrosion resistance on a ferrous sulfate film that is easily removed by erosion or turbulence. Rapid corrosive attack takes place in the absence of that film. Therefore, the maximum permissible design velocity in carbon steel is set at 2 ft/s.

Turbulent flow occurs in elbows, tees, valves, and rough or uneven internal pipe surfaces, e.g., steps or ledges created by improper pipe alignment during welding. Turbulence so created may extend over a distance of several pipe diameters downstream. Moreover, the solubility of the ferrous sulfate layer is directly proportional to temperature. For carbon steel, 50 deg C (120 deg F) is considered the upper limit in acid of 92-98% concentration; between 78 and 90% concentration, the corresponding temperature is only 25 deg C (80 deg F).

The remainder of this section suggests materials that are suitable for equipment and components in contact with concentrated sulfuric acid:

Storage tanks - These may be carbon steel, provided that a corrosion allowance of 1/8-1/4 in. (3-6 mm) above the design wall thickness can be accommodated. Discharge nozzles should be Type 316L.

Piping - Use ductile iron for large-diameter piping, and 304L or 316L for piping having an internal diameter of 3 in. (7.6 cm) or less.

Valves and pumps - Types CF3M (J92800) (19% Cr, 11% Ni, 2.5% Mo) and CN-7M (J95150) (20% Cr, 29% Ni, 2.5% Mo, 3.5% Cu) are usually selected to cope with velocity effects. CN-7M and CD4-MCu (J93370) (26% Cr, 5% Ni, 2% Mo, 3% Cu) can be specified for valves and pumps at little additional cost. These casting alloys also offer resistance to dilute acids up to specific limiting temperatures.

Tank cars and road tankers - An iron sulfate sludge tends to accumulate in these tanks and must be removed periodically. Because handling and brushing the internal surfaces is unavoidable during sludge removal, the tanks should be epoxy coated internally or preferably specified in 304L. Lightweight road tanker construction favors stainless steel, either in 304L or 316L. Tanks made from these alloys can carry a wide range of products, are easy to clean, and reduce the hazards of product contamination.

When concentrated sulfuric acid is fed into an aqueous stream, the temperature of the diluted acid rises. To prevent attack by the hot acid, the mixing section is usually a spool of 14.5% silicon iron. A check valve is provided to prevent backup of the intermediate-strength acid. Corrosion rates inside a dilution device usually exceed the capabilities of the various stainless steels and Alloy 20 (N08020). Cast or wrought control valves can be made from Alloy C-276 (N10276).

In summary, the major problems associated with handling and storage of concentrated sulfuric acid relate to:

1. Hygroscopic effects;

2. Exothermic temperature rise on dilution; and

3. Velocity effects that erode or otherwise damage protective surface layers.

Selecting corrosion-resistant materials

Corrosion is a complex and baffling phenomenon. Seemingly unimportant variables, such as minute amounts of impurities, can materially change the performance of alloys. Nevertheless, concisely summarized information is useful in that it permits a bird's eye view of a situation, a preliminary screening that helps to minimize the number of materials to he considered and evaluated. Figure 2, an isocorrosion chart based on pure sulfuric acid, presents such a screening tool. It summarizes the limits of usefulness for some of the alloys shown in Table 1. Figure 2 also indicates the inhibiting effect which metal sulfate corrosion products exert on the performance of stainless steels (the dotted lines in the figure).

Effect of contaminants

Oxidizing contaminants include sulfur dioxide, dissolved oxygen, nitrite or nitrate ion, chromates or vanadates, and oxidizing metallic cations -- notably ferric and cupric ions. If these are present in sufficient quantity, they can passivate stainless steel. Figure 3 demonstrates the relevant effect for 304L and 316L. The effect of ferric ion is not significant in highly-concentrated acid, 96% and beyond. Great care must he exercised if oxidizing agents are to be relied on as corrosion inhibitors to passivate alloys. This practice can be very dangerous, especially in the presence of chlorides or in equipment that contains undercuts or crevices wherein the inhibitors may be depleted locally.

Reducing contaminants include the halides, various compounds of arsenic and antimony, as well as hydrogen sulfide. These adversely affect the performance of stainless steel.

Specialty alloys

Iron- and nickel-base alloys have been developed to cope with intermediate concentrations of sulfuric acid in conditions beyond the capability of Type 316L. These alloys can be specified across the full range of acid concentrations up to 65 deg C (150 deg F). Comparable performance is obtained from the 6% molybdenum alloy 904hMo (N08925) and Alloy 28 (N08028) stainless steels, as well as the highnickel alloys 625 (N06625), G-3 (N06985), and C-276. The performance of some representative compositions in reagent sulfuric acid is compared in Figure 4 in which isocorrosion lines are for 20 mpy. The differences between their effectiveness are governed by the nature of the impurities that are present. In some cases, these impurities can extend the passivity of the alloys up to a temperature of 80 deg C (175 deg F), or even to the boiling point in the concentration range up to 40%.

The literature often describes corrosion resistance in terms of isocorrosion lines for rates of 5, 20, or 50 mpy (mils/yr -1 mil = 0.025 mm). Corrosion rates below 3 mpy are meaningful for passive film forming alloys; alloys with corrosion rates above 20 mpy should not be used.

In nonpassivating nickel-base alloys such as Alloy 400 (N04400) and Alloy B-2 (N10665), corrosion resistance usually depends on the insolubility of the protective surface film of metallic sulfate corrosion product. In the absence of oxidizing species, these alloys perform better than the chromium-bearing grades in acids of less than 25% concentration and temperatures up to the boiling point. Under these conditions, Alloy B-2 may be specified in concentrations up to 50%, while Alloy 400 may be used at temperatures up to 65 deg C (150 deg F) in the range of 25-50%, provided that no accumulation of cupric corrosion products can occur. The resistance of Alloy B-2 diminishes at acid concentrations of 70%, and Hastelloy Alloy D can be used for acid concentrations of 70-100% at temperatures over 65 deg C (150 deg F). Alloy B-2 and Alloy 400 will also resist chloride ion contamination in the acid.

Casting alloys

Comparable casting alloy specifications are available for many of the alloys mentioned above. Although their composition usually deviates somewhat from the corresponding wrought specifications, the casting alloys offer substantially similar corrosion resistance. Traditional high-nickel casting alloys, such as Illium and Chlorimet, have been largely replaced by compositions typically containing 32% Cr, 35% Ni, 16% Fe, 6% Co, 4% Mo, and 3.5% Si. These offer exceptionally good resistance to acids at temperatures up to 125 deg C (260 deg F), even under conditions in which erosion or abrasion may occur.

Miscellaneous materials

At acid concentrations below 80%, lead has been a traditional material of construction. However, its use has decreased because of its toxicity and because other more cost-effective materials have become available. In weak sulfuric acid, titanium is of interest only if powerful oxidants are present, as, for example, in the high-pressure leaching of copper ores at 15% acid concentration. Zirconium can be useful in acid concentrations up to about 60%, although care is required at approximately 60% and 80 deg C (180 deg F) because, in these conditions, the corrosion products are pyrophoric and pose an ignition hazard. Tantalum may be used at all acid concentrations up to the atmospheric boiling point; however, in concentration ranges between 77 and 100%, it should not be specified at temperatures above 190 deg C (375 deg F). Similar performance may be expected of glass, although neither it nor tantalum should be used in the presence of fluorides where glass suffers direct chemical attack while tantalum undergoes rapid deterioration as a result of hydriding phenomena. The 14.5% silicon-iron alloy can handle the full range of sulfuric acid concentrations up to the boiling point, but is also attacked by fluoride contamination that removes the protective siliceous film. Now, we will look at alloys for common sulfuric acid services.

Hydrometallurgy

AISI Type 316L is satisfactory for the tanks, piping, and other equipment in a copper refinery. Acid concentrations vary between 13 and 15%; the temperature in the electrowinning bath varies from 50-65 deg C (120-150 deg F). Cupric sulfates inhibit corrosion at the surface of the alloy. However, 316L is not suitable for the 100-psi heating coils that cause the metal to attain temperatures beyond its permissible limit. Alloy 20 or 904L (N08904) would be more appropriate. In zinc refineries, extensive applications for stainless steel include 304L for cathode starting sheets, and 316L for evaporators and crystallizers that handle byproducts such as copper sulfate. The finished crystalline product is conveyed and stored in equipment made from Type 304L. In Figure 2, dotted lines show the inhibiting effect of metal sulfate salts on the performance of Types 3i6L and 904L. Similar benefits are obtained for Type 304L.

Organic sulfation and sulfonation

Sulfuric acid at 93% concentration and at temperatures between room and 60 deg C (140 deg F) is suitable for sulfation of oils to make wetting agents and penetrants. Usually processed in batches, the sulfation product is salted out, washed, and neutralized with caustic soda. Frequently, all of these steps take place in the same vessel. Alloy 400 is specified not only for the vessel, but also for the heating coils, pipe, agitators, and pumps. A wide variety of detergents and wetting agents is now made by sulfation of fatty alcohols or fatty esters. Steel and cast iron reaction equipment may be used, provided that the sulfuric acid concentration is not permitted to fall below 80% during the reaction. If the concentration of the acid is likely to fall below that limit, Alloy 400 or Alloy 20 should be specified.

Petroleum refining

In sulfuric acid alkylation, the hydrocarbons are emulsified in 98% acid and reacted at temperatures in the range of -1 deg C to +10 deg C (30 deg F to 50F). The acid remains fairly concentrated, diluting to about 88%. Mild steel offers satisfactory corrosion resistance except in areas where high velocity may be encountered, such as in pumps, valves, or return bends, for which 304L or 316L should be specified.

Acid treatment of lubricating oils and other distillates is generally carried out in 83% acid at 65 deg C (150 deg F), although some processors may operate at temperatures as high as 105 deg C (220 deg F). The acid is diluted with water to facilitate separation of the sludge which arises after treatment. Batch operations commonly use Alloy 400, which can also be specified for the high-speed centrifugal equipment that accomplishes the separation of oil from sludge. Because acid and oil remain mixed in this equipment, corrosion is usually not severe at moderate temperatures.

Ammonium sulfate

Ammonia-rich gases pass upward through a tower countercurrently to a stream of ammonium sulfate solution that contains sulfuric acid at a temperature of 50 deg C (120 deg F) and concentrations between 4 and 10%. The exiting solution is pumped to a crystallizer and then to centrifuges or filters. In this process sequence, both Alloy 400 and Type 316L have performed well for the scrubber, crystallizer, motherliquor mixing tank, and the settling tanks. In an alternative process sequence, ammonium sulfate is generated by reaction of synthetic ammonia gas with concentrated sulfuric acid in a mother liquor of concentrated ammonium sulfate. Operating temperatures range between 80 and 105 deg C (180-220 deg F). While Alloy 400 is unsuitable in this temperature range, 316L may be used for reactor and crystallizer equipment.

Phosphate fertilizers

Phosphate rock feed material enters the system as a slurry that reacts with a mixture of concentrated sulfuric acid and partially spent acid that has been recycled from the filtering operation. The agitator paddles and shafting are commonly made from Alloy 20, Alloy 825, or Alloy 904L. The same alloy selection applies to a slight variant of the foregoing process sequence where the sulfuric acid is prediluted with filter acid prior to entering the reactor. However, the service life of the foregoing alloys has proved to be significantly shorter in newly designed isothermal reactors that are characterized by higher velocities and more severe agitation and abrasion by the gypsum solids. Here, Alloy G-3 has proved to be successful for the draft tube, shafting, and impeller. Depending upon the type of feedstock, corrosive attack in these units can become exceptionally severe. Some phosphate rocks contain high concentrations of fluorides and chlorides in addition to oxidizing metal salts, chlorates, and manganese peroxides. Occasionally, only alloys such as Alloy C-276 or Alloy 625 will suffice in this environment.

Flue-gas scrubbers

After the effluent gases from power-generating plants have been scrubbed free of sulfur dioxide, these wet gases are routinely mixed with some 10% by volume of nonscrubbed hot gases. This is to raise the temperature of the scrubbed gases from 60 to 70-80 deg C (135-160 deg F) to increase stack efficiency. This practice has brought about extremely severe corrosion in the outlet ducting, the stack breeching section, and the stack liner. The attack is particularly virulent during startup and abnormal operating conditions when a higher-than-normal percentage of sulfur dioxide-bearing flue gas may bypass the scrubbers. Since the mixed gases will be at a temperature below their dew points, they will throw off condensate. The adiabatic saturation curve for sulfuric acid (Figure 5) helps to determine the approximate concentrations of the acid to be expected in the condensing droplets. Under normal operating conditions, these concentrations range from 25-55% sulfuric, but they can rise to as high as 80% under full bypass conditions. Several plants have successfully applied Alloy 625 and Alloy C-276 for the exhaust ducting, breeching section, and stack liners. High-alloy cladding and thin-gage alloy liners have been employed as an added economy measure.

Acid pickling

Hot-rolled, forged, or heat-treated steel parts are pickled in hot sulfuric acid solutions to remove oxide scale. Acid concentrations range from 5 to 15% at temperatures of 60-95 deg C (140-200 deg F). Alloy 400, containing 66.5% nickel and 31.5% copper, is the accepted material of construction for crates, racks, baskets, hooks, chains, and other components that support the steel during the pickling sequence. The pickling reactions appear to consume any oxygen which may have been dissolved in the acid. Hydrogen evolved by reaction of the acid with the steel helps to keep the metallic ion contaminants in a reduced state. Moreover, Alloy 400 may become galvanically protected by the steel parts with which it comes in contact. Alloy 400 racks are also chosen for pickling brass and copper, and for the racks that hold the product to be pickled prior to enameling or carburizing.

Alloy 825 (N08825) may be specified for most pickling applications. In one case, it replaced Alloy 400 for a hook that conveyed wire bundles through an acid bath. The first stage was a dip into H2SO4 at a concentration of 12% and a temperature of 70C (160oF) in the presence of sodium dibromate. This treatment was followed by a dip into a mixture consisting of 60% H^sub 2^SO^sub 4^, 25% HNO^sub 3^, and 0.2% HCl, by weight. Alloy 825 achieved excellent results not only for the hook, but also for the heating coils in both pickling baths.

To sum up

Nickel, chromium, molybdenum, copper, and silicon are the most important of the elements that enhance the corrosion resistance of alloys in sulfuric acid service. Relatively newer alloys, such as Alloy 904L and Alloy 28, have proved to be highly corrosion resistant as well as cost-effective. Please refer to Table 3 for relative cost indications of the various alloys. Many of these alloys resist sulfuric acid both under reducing and oxidizing conditions. Established alloys that have performed satisfactorily over several decades include Alloy 20 and Alloy 825. Under the most severe conditions, Alloy 625 and Alloy C-276 receive consideration. Bronzes and nickel-base alloys containing 28% molybdenum or 14.5% silicon, respectively, have lost ground to the stainless steels and nickel-bearing alloys that rely for their corrosion resistance on a passivated surface layer. Newer sulfuric acid manufacturing flowsheets have been developed and promoted by major chemical plant constructors seeking maximum operating economy through energy savings and low maintenance costs. These installations make effective use of 304L, 316L, and Alloy 904L.

In general, three strategies may be employed to tackle corrosion problems that arise with equipment in sulfuric acid service:

1. Addition of an oxidizing agent;

2. Application of anodic protection; and

3. Selection of a more-corrosionresistant alloy.

[Sidebar]

Copyright (C) Nickel Development Institute, Toronto, ON, Canada. Used with permission.

[Author Affiliation]

C. M. SCHILLMOLLER is head of Schillmoller Associates, Belleair, FL (Tel. and Fax: 813/4435114). He has over 36 years of experience in the market development of stainless steels and nickel-containing alloys for corrosion control and high-temperature service. Schillmoller has held senior marketing positions with INCO and VDM in the U.S., Australia, and Europe. He is a chemical engineering graduate from the University of Sydney, Australia, a PE in California, and a NACE International Accredited Corrosion Specialist. He is the author of over 275 technical papers and articles dealing with alloy applications in the petroleum, petrochemical, and chemical industries, has lectured at Stanford and the University of California (Berkeley), and has taught numerous corrosion short courses. He is a member of NACE and AIChE.

Cubs jump into hunt for Girardi, consider offer to Hernandez

The Cubs have offered a contract to New York Yankees free-agentcatcher Joe Girardi, but Girardi has several other suitors.

"We appreciated the Cubs' offer," said Alan Nero, Girardi's agent."But we have another offer, expect two more soon and believe therecould be a fifth offer. The Cubs understand I will get back to themwhen we know more.

"I haven't talked to them about Joe playing every day, but I willbefore it is over. He could have stayed in New York if he wanted tobe a backup."

While general manager Ed Lynch awaits Nero's response, he isconsidering bringing back another former Cub: Atlanta Braves free-agent infielder Jose Hernandez.

"Jose would fit a need," Lynch said Wednesday. "Look at the rolesthat he played here - shortstop, third base and outfield. But would Ioffer him what I did before (three years, $9 million)? I don't know.But beefing up the middle infield is my focus right now, and I'vetalked to Alan Nero (also Hernandez's agent)."

If Lynch makes the same offer, Hernandez insisted he won't takeit. He thought the Cubs' eleventh-hour push for a contract beforetrading him to the Braves on July 31 was unfair. Even with time toponder the figures, he remains adamant about getting more.

"We are asking for what Pat Meares got from Pittsburgh (fouryears, $15 million)," Hernandez said from his home in Puerto Rico."With (Walt) Weiss back for one more year in Atlanta, I don't wantany of that stuff where he plays one day and I play another day. Ihear Atlanta is going to offer me one more year. But I want to gosomewhere I'd play every day. I think I could do that in Chicago."

The Cubs are interested in Hernandez as an alternative toshortstop Jose Nieves. Nieves became the starter in August afterHernandez was dealt and showed promise, though he made too manyerrors on routine grounders.

If Chad Meyers falters at second base, manager Don Baylor wouldhave the option to start Nieves at second and Hernandez at shortstop.Hernandez's 42 home runs in the last two seasons are appealing, whilehis 285 strikeouts stand out as his biggest liability.

"Their interest is hard to gauge at this point," Nero said of theCubs. "They have indicated they might go with younger players."

Girardi, 35, had only 209 at-bats last year with the Yankees. Hebatted .184 in 49 at-bats against left-handed pitching and .256 in160 at-bats vs. right-handers. The Yankees paid him $3.4 million lastseason.

"We are looking for a right-handed-hitting catcher, and Joe fitsthat need," Lynch said of pairing him with left-handed-hitting JeffReed.

Texas Rangers free-agent center fielder Tom Goodwin interestsLynch. But Goodwin's reported asking price of $15 million for threeyears isn't in line with the Cubs' plans for phenom Corey Pattersonto be in the 2001 starting lineup.

As for free-agent pitchers, the Cubs are in no hurry to sign any.But Lynch is interested in signing a starter once the prices levelout.

Free agents such as Chuck Finley, Juan Guzman, Andy Benes, OmarOlivares, Kenny Rogers and Steve Trachsel are seeking between $6million and $9 million a year for three or four years.

"It has yet to be decided if people are overpricing themselves atthe moment," Lynch said.

The Cubs also believe their ace, Kerry Wood, will return to formnext season after reconstructive elbow surgery. Lynch said Wood won'tthrow off the mound in Mesa, Ariz., for Baylor and his coaches for aweek or two.

NOTE: Utility infielder Manny Alexander agreed to a one-year,$612,500 contract with the Cubs on Wednesday. The right-hander batted.271 in 177 at-bats last season. Alexander, 28, will be used mostlyas a pinch hitter.

Teachers' perceptions of inappropriate student behavior as a function of teachers' and students' gender and ethnic background

ABSTRACT. This study investigated teachers' perceptions of inappropriate student behavior as a function of students' and teachers' gender and ethnic background characteristics. The study used videotapes depicting inappropriate behavior of four different students (i.e., African-American female, African-American male, White female, White male). A total of 87 inservice teachers and 99 preservice teachers viewed the videotapes. Following each videotape, participants were asked to complete a 32-item behavior rating scale focusing on the teachers' perceptions of the student in each videotape. Analysis of the data revealed statistically significant differences related to the gender of the teacher, but not to the ethnic background of the teacher. Statistically significant differences also were found among students depicted in the videotapes. The African-American female student was judged to display more problem behaviors than the White female student. and the White male student was rated as displaying more classroom difficulties than the White female student. Teachers were not found to make judgments based on their ethnic background. The gender of the teacher and the gender of the student appeared to have the most influence on teachers' perceptions of behavior.

Rhodes (1967) characterized behavioral deviance as an interaction between the student's behavior and the response that the behavior provoked from others in the environment. This characterization of student behavioral problems as disturbing to others places emphasis on the investigation of teacher tolerance levels and teacher perceptions of deviant behavior (Kelly, Bullock, & Dykes, 1977; Prieto & Zucker, 1981; Shinn, Tindal, & Spira; 1987; Tobias, Cole, Zibrin, & Bodlakova, 1982; Tobias, Zibrin, & Menell, 1983; Zucker, Prieto, & Rutherford, 1979). According to Edelbrock (1983), teachers vary in their tolerance of student behaviors, in their ability to deal with problem behaviors, and in their expectations related to student behaviors. Similarly, Shinn and colleagues (1987) noted that different degrees of teacher tolerance for behaviors resulted in bias in referral and assessment. These authors also concluded that bias was affected by "prejudicial judgments influenced by naturally occurring pupil characteristics such as ethnic background, sex, and physical attractiveness" (p. 33).

The evaluation of students referred to special education for emotional or behavioral problems has been viewed as difficult and often subjective (Algozzine, Ruhl, & Ramsey, 1991; Schwartz, Wolfe, & Cassar, 1997). This process is even more complicated when addressing students from ethnically different backgrounds (Council for Children with Behavioral Disorders, 1989). Kauffman, Cullinan, and Epstein (1987), as well as Wilson and Bullock (1989), indicated that students' ethnic background and gender were two factors that affected teachers' decision making in student referral and ratings and needed further investigation.

Researchers have investigated the possibility that teachers may be biased in their decisions or assessment of students as a function of their gender or ethnic background. In one study, the teacher's gender was found to affect teacher perceptions of the behavior of students with emotional or behavioral disorders (E/BD) (Kelly et al., 1977). Kelly found that female teachers perceived higher percentages of students as exhibiting behavioral difficulties than did male teachers. On the other hand, Tobias and colleagues (1983) and McGee (1985) did not find significant differences in teacher ratings of the severity of behavior related to the gender of the teacher.

The ethnic background of the teacher also was found to produce conflicting results. Teachers of Hispanic origin, when compared to White or African-American teachers, tended to show a preference for mainstreaming students with disabilities (Tobias et al., 1982) and rated females more severely than males (Tobias et al., 1983). Tobias and colleagues (1982) found that teachers tended to refer students for special education placement more frequently when the students were from ethnic backgrounds other than their own; however, Tobias and colleagues (1983) did not find this interaction. Bahr, Fuchs, Stecker, and Fuchs (1991) found that both African-American and White teachers rated African-American students as more appropriate for referral to special education than White students.

Much of the conflicting data from studies may be explained by the research methodology used. For example, several studies (Prieto & Zucker, 1981; Zucker & Prieto, 1977; Zucker et al., 1979) were conducted that used fictitious case studies to examine the effect of ethnic background of the student on referral patterns. Teachers considered special education placement more appropriate when the students were described as Hispanic rather than as White. Other researchers (Matuszek & Oakland, 1979; Tobias et al., 1982), using similar methodology, found that the ethnic background of the student was not a significant influence on the teacher's determination to refer a student to special education. Two of these studies (Zucker & Prieto, 1977; Zucker et al., 1979) also investigated the influence of student gender on referral; in these studies, student gender was not found to influence the teacher's determination to refer the student to special education. However, Shinn and colleagues (1987) indicated that gender could not be discounted as a factor influencing teachers' referral decisions. Written case studies are limited in that no observation of actual behavioral differences or similarities occurs that might explain contradictory findings.

The purpose of this study was to extend the research regarding gender and ethnicity in the identification of students with problem behaviors. Limitations of previous studies have left the profession currently without a clear answer regarding this relationship. The research questions addressed in this investigation were designed to determine whether differences in teachers' perceptions as measured by ratings of inappropriate behavior of students from different gender and ethnic backgrounds exist (a) as a function of teachers' gender and ethnic backgrounds, (b) as a function of students' gender and ethnic backgrounds, or (c) as an interaction of these conditions.

Methods and Procedures

Participants

A total of 186 preservice (n = 99) and inservice (n = 87) teachers enrolled in graduate and undergraduate education courses were selected as participants in this study. Participants were selected from two state universities in the Southeastern United States, with a minority student representation of at least 24% each. Across both preservice and inservice teachers, 24.55% were African-American females, 11.8% were African-American males, 45.8% were White females, and 17.85% were White males.

Instrumentation

Videotapes

Four videotapes were created for data collection. The tapes featured a White male student, a White female student, an African-American male student, and an African-American female student as the target student for observation. These students were selected due to similar age and physical stature. Only partial views of the students' faces were videotaped in an attempt to control for physical attractiveness.

The videotapes were made in the same classroom and showed the same incidents of undesirable behaviors (e.g., pencil tapping, disturbing others, mild rebukes to the teacher). By staging the videotapes, consistency in factors other than the gender and ethnic background of the student was maintained. For example, all students other than the target student were in the same classroom location engaging in the same behaviors. The target students were dressed alike in jeans and sweaters and were prompted to engage in similar rates of desirable and undesirable behaviors while the teacher engaged in the same instructional and management behaviors across all tapes. This was accomplished by using written scripts. The tapes were reviewed by members of a graduate class in applied behavioral analysis to ensure that the undesirable behaviors were consistent across all tapes.

Rating Scale

The Brief Record of Observed Behavior (BROB), a modified version of the Direct Observation Form (DOF) (Achenbach, 1991), was used in this investigation. For this study, the BROB included only those items from the DOF that pertained to the behaviors observed in the videotapes described earlier. All participants in the study completed four BROB forms related to the behaviors of students viewed in each of the four videotapes. The edited BROB contained 32 items using a 4-point Likert scale with the following descriptors: not observed (0), ambiguous occurrence (1), definite occurrence of mild to moderate intensity (2), and definite occurrence with severe intensity (3).

Cronbach's coefficient alpha (i.e., internal consistency) was used to ascertain the reliability of the modified instrument. Results of the initial analysis indicated a coefficient alpha of .92. This reliability of the BROB compares favorably with the standard version of the DOF. Reliability of the BROB across the order of presentation also was evaluated using Cronbach's coefficient alpha. On the first behavior rating scale completed by the participants, a coefficient alpha of .90 was obtained. The second behavior rating scale had a coefficient alpha of .91, the third had a coefficient alpha of .92, and the fourth had a coefficient alpha of .93. Next, a principal factor analysis with Varimax rotation was conducted on the BROB. This analysis led to the clustering of items into three factors: Inattention, Defiance, and Impulsivity.

Procedures

Teachers participating in the study viewed all four of the videotapes of the students. Within each university class, the order of presentation of the videotapes was counterbalanced. Instructions were read from a script for each class regarding the respondents' task of rating the videos. In short, participants were instructed to watch each video and complete a BROB for the target student (i.e., African-American female, African-American male, White female, White male) after each tape. Thus, each participant completed four behavior rating scales.

Results

Prior to analyses for ethnic and gender differences, an analysis was completed to determine whether the order of presentation or the university site had an effect on respondents' ratings. No statistically significant differences were present in total scores as a function of order of completion or university setting.

A factoral analysis of variance (ANOVA) was conducted to evaluate the effects of teacher gender, teacher ethnic background, and the interaction of these factors on total scores of the BROB. This analysis was performed for the categories (a) African-American male student, (b) African-American female student, (c) White male student, and (d) White female student. The only statistically significant effect was found for the African-American female student as a function of teacher gender, F (1, 185) = 7.32, p < .05. Male teachers rated the African-American female student viewed on tape as more troublesome than did female teachers. Male teachers had higher BROB scores than female teachers for each student rated. However, as noted, the difference between male and female teachers reached statistical significance on only one student, the African-American female.

Student factor (i.e., Inattention, Defiance, Impulsivity) scores derived from the BROB also were analyzed as a function of teacher gender, teacher ethnic background, and the interaction of these factors. Again, the only statistically significant interaction was for the African-American female student, with a statistically significant difference in scores on Impulsivity as a function of teacher gender, F (1, 185) = 6.79, p < .05. Male teachers rated the impulsive behaviors of the AfricanAmerican female student higher than did female teachers.

A series of one-way repeated-measures ANOVA comparisons was conducted to evaluate the difference between student total scores on the BROB. Within-subject contrasts yielded a statistically significant difference between the groups of students, F (3, 183) = 7.26, p < .05. Therefore, a follow-up analysis of the BROB total scores with paired-samples t-tests was conducted to determine where overall differences occurred. Because multiple t-tests were performed, a Bonferroni test (Hocking, 1996) with an adjusted alpha level of .0125 was used (i.e., .05 divided by 4).

A paired-samples Rest for the African-- American female student and the White female student viewed on videotape yielded a statistically significant finding, t (185) of 2.66, p < .0125. Teacher ratings (n = 186) showed that the African-American female student was judged to exhibit more problem behaviors (M = 51.20, SD = 17.11) than the White female student (M = 48.64, SD = 17.27). A paired-- samples Rest (n = 186) for the White female student (M = 48.64, SD = 17.27) and the White male student (M = 51.58, SD = 17.92) viewed on videotape also showed statistically significant results, t (185) = -4.53, p < .0125. Teacher ratings showed that the White male student was viewed as displaying more problem behaviors than the White female student. No differences were revealed for the AfricanAmerican male and White male or for the African-American female and White male comparisons, all ps > .0125.

To determine whether a significant difference in factor (i.e, Inattention, Defiance, Impulsivity) scores existed, a one-way repeatedmeasures ANOVA was conducted for each of the three factor scores. Within-subject contrasts yielded a statistically significant difference between students on Defiance, F (3, 183) = 5.58, p < .05, and Impulsivity, F (3, 183) = 7.89, p < .05. No statistically significant difference was found between the groups of students on Inattention, F(3, 183) = 2.03, p > .05, which measured nonattending behaviors.

The repeated-measures ANOVA of Defiance and Impulsivity was followed by paired t-tests to determine where the differences in student ratings on these factors occurred. For Defiance, the paired samples ttest for the White male student and the White female student yielded a t (185) of -4.10, which was statistically significant at the .0125 level. The White male student had a mean rating of 7.95 (SD = 3.10), whereas the White female student (n = 186) had a mean rating of 7.21 (SD = 3.21). These results show that teachers rated the White male student seen in the videotape as displaying more problems related to defiance than the White female student. No statistically significant findings were found in the comparisons of the AfricanAmerican female to the White female, the African-American male to the White male, or the African-American female to the AfricanAmerican male (all ps > .0125).

On Impulsivity, the paired-samples t-test for the African-American male student and the White male student viewed by teachers yielded a t (185) of -4.52, which was statistically significant at the 0.125 level. The AfricanAmerican male student had a mean rating of 8.04 (SD = 4.87), and the White male student had a mean rating of 9.03 (SD = 4.88). From the behaviors observed in the videotapes, the White male student was judged by teachers to display more impulsive and immature behaviors than the African-American male student. A comparison of the rating of the White female student and the White male student also yielded statistically significant results, t (185) = -3.30, p < .0125. Again, the White male student was observed to display more difficulties in this area. No statistically significant differences were found for the comparisons of the African-American female and the White female or the African-American female and the White male.

Discussion

This study compared the responses of four groups of inservice and preservice teachers on a behavior rating scale. The four groups of teachers (i.e., African-American female, White female, African-American male, White male) rated videotapes of the behavior of four different students (i.e., African-American female, White female, African-American male, White male) engaged in similar classroom interactions. No statistically significant differences were found in ratings of the students related to the ethnic backgrounds of the teachers or the interaction of ethnicity and gender. Statistically significant findings were found related to the gender of the teacher. Male teachers were found to rate the African-American female student as having more behavioral difficulties than did female teachers. This same pattern was also found in the factor scores on Impulsivity. Again, male teachers rated the African-American female as displaying a higher level of impulsive behaviors than did female teachers. In fact, the male teachers' ratings of all students were higher than the female teachers' ratings; however, the only statistically significant difference was for the AfricanAmerican female student.

Interestingly, these findings are contrary to previous research findings. Kelly and colleagues (1977) found that male teachers were more tolerant of inappropriate behavior than female teachers. In his field-based study, teachers were asked to rate their students as having mild, moderate, or severe behavioral disorders. Using fictitious case studies, Tobias and colleagues (1983) and McGee (1985) did not find gender differences in teacher judgments of appropriateness of referral to special education. These studies did not use a behavior rating scale to measure teachers' tolerance for behaviors. It is possible that male teachers have fewer behavioral problems in their classrooms and make fewer referrals to special education for behavioral difficulty than female teachers. However, in this study male teachers' ratings of inappropriate behavior were higher than those of female teachers. Thus, male teachers may actually be less tolerant of inappropriate behaviors than female teachers.

In using case studies in which only the ethnicity and gender of the student were altered, Tobias and colleagues (1982) found that teachers referred students to special education more frequently when the students were from ethnic backgrounds other than their own. However, Tobias and colleagues (1983) failed to find differences in the decision to refer students to special education as a function of the students' and teachers' ethnic backgrounds. The results presented in this study are consistent with the 1983 findings in that the ethnic background of the teachers did not affect their ratings of students.

Bahr and colleagues (1991) found that although African-American and White students had similar scores on the Behavior Problem Checklist, a significantly larger number of African-American students were referred to special education by both African-American and White general education teachers. The authors noted that the differential referral of students to special education was more likely related to academic achievement than to differences in student behavior. Achievement (i.e., correct and incorrect academic responding) was a variable controlled across each of the four videotapes in this study and, therefore, should not have affected participant ratings.

Statistically significant differences in the total BROB score as a function of the students' gender and ethnic backgrounds were evident, with the White male student receiving the highest ratings of disruptive behavior. Additionally, the African-American female had statistically significant higher scores than the White female. These findings suggest that students' characteristics of gender and ethnic background may have an influence on teacher ratings.

Limitations

Clearly, conclusions drawn from these data are subject to several limitations. First, the videotapes showed only a brief sample of student behaviors; and even though the disruptive behaviors were controlled carefully for each student, some subtle differences in topography (e.g., vocal tone) could have been present that contributed to the findings. Extended observations of student behavior would allow a more in-depth investigation. A second limitation is that the data were collected in one geographic area of the country. Thus, students and teachers from the Hispanic culture were eliminated from this investigation due to the difficulty in obtaining a participant sample of Hispanic teachers. Third, to obtain a sample of participants that was reflective of gender and ethnic diversity, both inservice and preservice teachers were included, along with special education and non-special-education teachers at elementary, middle, and secondary levels. Individual studies with larger samples from each group might produce different results. Finally, most of the differences that were found to be statistically different were perhaps numerically different by only a few points; readers are cautioned to evaluate these close differences from a clinical perspective.

Conclusion

The findings in this study have implications for the assessment of students referred to special education for their behavioral difficulties. It appears that the teachers did not make judgments based on their ethnic backgrounds. The gender of the teacher and the gender of the student appeared to have the most influence on teachers' perceptions of behavior.

[Reference]

References

[Reference]

Achenbach, T. M. (1991). Manual for the Child Behavior Checklist/4-18 and 1991 profile. Burlington: University of Vermont, Department of Psychiatry.

Algozzine, B., Ruh], K., & Ramsey, R. (1991). Behaviorally disordered? Assessment for identification and instruction. Reston, VA: Council for Exceptional Children.

[Reference]

Bahr, M. W., Fuchs, D., Stecker, P. M., & Fuchs, L. S. (1991). Are teachers' perceptions of difficult-toteach students racially biased? School Psychology Review, 4, 599-608.

Council for Children with Behavioral Disorders. (1989). White paper on best assessment practices for students with behavioral disorders: Accommodation to cultural diversity and individual differences. Behavioral Disorders, 14, 263-278.

Edelbrock, C. (1983). Problems and issues in using rating scales to assess child personality and psychopathology. School Psychology Review, 12, 293-299.

[Reference]

Hocking, R. R. (1996). Methods and applications of linear models: Regression and the analysis of variance. New York: Wiley.

Kauffman, J. M., Cullinan, D., & Epstein, M. H. (1987). Characteristics of students placed in special programs for the seriously emotionally disturbed. Behavioral Disorders, 12, 175-184.

Kelly, T. J., Bullock, L. M., & Dykes, M. K. (1977). Behavioral disorders: Teachers' perceptions. Exceptional Children, 43, 316-318.

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[Reference]

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[Reference]

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[Reference]

MANUSCRIPT:

[Reference]

Initial Acceptance: 8/23/00

Final Acceptance: 9/18/00

[Author Affiliation]

Paulette B. Taylor

Ware County Schools

Philip L. Gunter

Valdosta State University

John R. Slate

University of Texas at El Paso

[Author Affiliation]

AUTHORS' NOTE:

[Author Affiliation]

Readers desiring a more detailed version of this manuscript with accompanying tables should contact Philip Gunter, Department of Special Education and Communication Disorders, Valdosta State University, Valdosta, GA 31698. E-mail: pgunter@valdosta.edu. This manuscript is taken from a portion of the doctoral dissertation completed at Valdosta State University by Dr. Paulette Taylor.

[Author Affiliation]

AUTHORS:

[Author Affiliation]

PAULETTE B. TAYLOR, School Psychologist, Ware County Schools, Waycross, GA. PHILIP L. GUNTER, Professor and Department Head, Department of Special Education and Communication Disorders, Valdosta State University, Valdosta, Georgia. JOHN R. SLATE, Professor, Department of Educational Leadership and Foundations, University of Texas at El Paso.

Columbia exhibit turns over a new leaf on paper

Form follows function, as they say. Or is it that function followsform? Either way, you'll be surprised at just how functional paperreally is when you take a stroll through the Center for the Book andPaper Arts' latest exhibit, "Paper Adornment."

"Paper has come to be so disposable, so very expendable," sayscurator William Drendel. "Paper can be beautiful, though. And in thisexhibit, we've made paper non-expendable."

Drendel spent two months putting the exhibit together, whichfeatures more than 180 items from all over the world, crafted out ofpaper -- most of them are functional, wearable pieces of art.

Papermaking has been around for centuries, and since the beginningartisans have been using the material to make wearable objects.

The exhibit features paper masks, purses made entirely out ofcigarette wrappers and many pieces of jewelry. There's even a politicstatement, courtesy of Stacey Stern's "Public Law 107-243," which isa straitjacket made out of U.S. currency as a protest to the lawenacted that allowed the United States to invade Iraq.

There's even a spiritual side to the exhibit, Drendel says. TheBuddhist tradition of burning paper money for deceased ancestors touse in the afterlife has expanded to include articles of clothingmade out of paper, and the exhibit features some prime examples.

"Even the dead need clothes in the next life," he added.

*"Paper Adornment -- An International Exhibition of Wearables"continues through April 23 at Columbia College Chicago's Center forthe Book and Paper Arts, 1104 S. Wabash, second floor. Admission isfree. Gallery hours are 10 a.m. to 4 p.m. Monday-Saturday. Call (312)344-6630; www.bookandpaper.org.

a night at the mca: Chicago artist Susan Giles debuts her tourist-themed video installation piece "Panzoomtilt," 6-10 tonight as partof First Fridays at the Museum of Contemporary Art, 220 E. Chicago.DJs Ben Biz and John Herndon will be spinning music for thoseinclined to dance, and complimentary Wolfgang Puck hors d'oeuvres areincluded in the ticket price. The event is for those age 21 and over.Admission is $14. A cash bar also will be available until 9:30 p.m.Call (312) 397-4010; www.ticketweb.com. For more information aboutFirst Fridays or upcoming events, visit www.mcachicago.org.

talking italian art: Carlo Di Nello leads an Italian art historydiscussion at 7:30 tonight at the Italian Cultural Center, 1621 N.39th, Stone Park. Admission is free. Call (708) 345-3842.

On the auction block: The late Chicago artist Ed Paschke's lastprint is featured in "Slated," a print portfolio that will beauctioned off on Thursday as part of the Block Museum's benefit,Auction Block. Also included in the portfolio dedicated to his memoryare new prints from Karl Wirsum, Marilyn Propp and Richard Hull, justto name a few. The event will be held 6-9 p.m., with the auctionbeginning at 7:15. The $125 ticket price includes buffet supper,cocktails and a limited-edition box set of note cards that featuresart from the museum's permanent collection. Call (847) 491-7540;www.block-museum.northwestern.edu.

It does a body good: The Museum of Science and Industry (57th andLake Shore Drive) is now open daily from 9:30 a.m. to 9 p.m. throughSept. 5 for its exhibit Body Worlds: The Anatomical Exhibition ofReal Human Bodies. The last entry time for the exhibit is 8 p.m.Children under age 13 must be accompanied by an adult. Admission is$21 for adults, $11 for children ages 3-11, $17 for seniors andstudents with valid school I.D. Admissions on evenings is $16 foradults, $9 for children and $15 for seniors and students with validschool I.D. Advance tickets strongly recommended. Call (773) 684-1414; www.msichicago.org.

no April Fool's joke: Admission to the Morton Arboretum, I-88 andRoute 53 in Lisle, is only $1 today. Weather permitting, tram ridesare also just a buck today. Kids also can check out storytellingsessions at 1:15 and 2:30 p.m. Prizes will be awarded after eachsession to the kids who come to the Arboretum in the silliest, mostfoolish outfits. Call (630)-968-0074; www.morton-arb.org.

there in black and white: This is your last chance to see twoblack-and-white photography exhibits, Remnants of Our Forests Past byMiles Lowry and Jill Metcoff's Earth/Fire/Air Water: A Meditation onPrairie Burns, at the Chicago Botanic Garden, 1000 Lake Cook,Glencoe. Their photographs are on display and for sale from 9 a.m.to5 p.m. through Sunday. Admission is free; parking is $10. Call (847)835-5440 or visit www.chicagobotanic.org.

понедельник, 12 марта 2012 г.

From death to destruction: One man's escape from Lebanon

Winnipeg

On July 28, Bechara Azar, a Lebanese Canadian from Manitoba arrived in Winnipeg after being evacuated from Beirut. His plans for a month-long visit home to mourn the passing of his father were disrupted by "a rain of bombs" signalling the outbreak of a war with Israel that has killed hundreds of Lebanese civilians, left personal lives in chaos, and devastated the infrastructure and fragile economy of his country.

"The bombing started at the airport just two hours after my arrival in Beirut early on July 13," Azar said at the airport, sounding jet-lagged and dazed. "My brother had told me about the kidnappings of two Israeli soldiers [which Israel used as justification for its incursion into southern Lebanon] when I arrived. We expected some problems in the south, but not on this scale.... It never crossed my mind that there would be such a huge bombing campaign in Beirut! We heard the bombs very strong in the nearby suburb where we stayed," he continued. "You could feel the vibration... and the pressure pushing against you...."

In such a chaotic setting, holding a memorial service for his father in the Greek Catholic (Melkite) Church became impossible. Instead, the family shifted into survival mode-as they had many times in the past-extending hospitality to about 15 refugees, and helping Azar's sister and family, whose husband works in Jordan, escape to the Jordanian embassy.

"That was very dangerous, getting her there," said Azar. "Ten minutes later, the road was bombed and a helicopter shot down. It was quite a moment. We thought we wouldn't get back."

As for his own evacuation, initially he thought the war might stop at any time and he would take the road to Jordan. "But the road kept getting more dangerous," he said. So when his wife, Joan Barkman Azar, phoned to say that Canadian citizens did not have to wait to be called by the embassy to get onto the evacuation ships, he decided to go to the port to see what would happen. He was surprised when he showed his passport to a Canadian soldier, who told him he could go straight on board.

Thinking he was going to Cyprus, Azar actually ended up in Turkey. "There were about 200 people on the ship, including young families," he said. "It was an okay journey. They did a good job," he said of the Canadian rescue mission. After staying for a night in Turkey, Azar continued on by air to Montreal and finally arrived in Winnipeg on July 28, where he was warmly welcomed by his wife and a small group of well-wishers, including friends from Aberdeen Evangelical Mennonite Church in Winnipeg, where they attend.

Azar is glad to be safely back in Canada, but he is clearly distressed over those he left behind, especially his mother, with whom he hardly had time to visit.

"She's a very strong woman. We went through many wars together," he said ruefully. "Bombs, shrapnel in the house in 1982.... But the bombs are bigger now and shelters are no use."

"I don't know why [the Israelis] are doing this," he agonized. "They say it's because Hezbollah is using villagers as human shields. But there is no army there. These are just accusations...."

According to Azar, Israel's most recent incursion into Lebanon just "creates more enemies. It doesn't help the peace process. It will affect people for years to come. But if war stopped, they would forget."

While he appreciated the Canadian government's assistance in getting out of Lebanon, Azar is upset at Canada's response to the war itself. "I don't understand why they respond as they do," he said. "They just talk about violence on one side. At least they should condemn violence on both sides. Canadians should be writing to their governments, but I don't think it's going to change," he sadly concluded.

-Leona Dueck Penner