You are currently browsing the daily archive for junho 29, 2009.

Teoricamente, amanhã expira o “prazo de validade” do “pinger” das caixas pretas.  O “pinger” é o sinal ultrassônico que possibilita a sua localização por sonar.

Embora eu tenha lido em alguns lugares que apesar disso o sinal pode continuar ativo por até 60 dias, este blog, o “Unusual Attitude“, comenta que na verdade após os 30 dias a força do sinal cai acentuadamente.  Diante dessa realidade, a BEA, autoridade francesa responsável pela busca, teria contratado reforços na forma de um submarino autônomo (não tripulado) da empresa americana C&C Technologies, capaz de operar a 4.500 metros de profundidade.  Eis uma nota publicada pela empresa:

Air France 447 Search Effort: Phase II Fact Sheet

June 24, 2009

C & C Technologies, Inc. (C & C) has received inquiries regarding our discussions with the French BEA on the second phase of the AF447 search effort.

The following information may help minimize communication errors:

1) Pinger Life: Dukane, the AF447 pinger manufacturer, has confirmed that the pingers may only last a day or so longer than the specified thirty days. Unlike regular flashlight batteries that fade out slowly, the battery technology used in the pingers will hold its voltage for the thirty days, and then quickly collapse along with the transmitted signal.

2) Contact by BEA: The French BEA has contacted C & C by phone and e-mail regarding use of C & C’s 4,500 meter (15,000 feet) rated autonomous underwater vehicle (AUV) to perform a sonar search for the flight recorders. C & C has two 250 foot (76 meter) ships near the crash area equipped with state-of-the-art AUV systems. However, the AUVs on those vessels are only rated for 3,000 meters (10,000 feet), and the wreck area approaches 4,500 meters. If the pingers are not found by the end of June, French authorities may ask C & C to send its 4,500 meter rated AUV to Brazil to search the mountainous underwater terrain.

3) Comments Regarding BEA’s Actions: While the first phase of the search for the flight recorders continues, the BEA is making contingency plans for a second phase. Tapping C & C’s world-renowned deepwater AUV search capability indicates the French authorities’ commitment to locate the recorders and solve the mystery. Given the complexity of the situation, the BEA is making all the right moves.

4) AUV Description: Like the unmanned drone aircraft used by the military, AUVs are unmanned, untethered, computer controlled underwater vehicles. C & C’s 4,500 meter rated vehicle is capable of searching large areas while flying at a constant height off the ocean bottom at four knots for two days at a time before returning to the surface to refuel.

The 6 meter (20 foot) cigar shaped vehicle has an acoustic communications link (wireless underwater telemetry system) that can continuously transmit the sonar images to a surface ship in real time. Any debris detected by the AUV can be seen by observers on the ship in real time. The AUV also has a camera, so ambiguous sonar contacts can be quickly identified.

Because there is no cable between the AUV and the ship, the AUV can travel more than twice the speed of ROVs (remotely operated vehicles), which are tethered. C & C’s 4,500 meter rated AUV with mother ship and experienced scientific crew offers the highest possibility of flight recorder location if the current pinger locator effort fails. Pictures and video of the AUV can be found at:!

5) C & C’s Background: C & C is the worldwide leader in deepwater AUV operations. The company has performed more deepwater AUV searches than any company in the world, having surveyed enough to encircle the globe four times. C & C’s AUVs are usually used to perform deepwater oilfield surveys worldwide. C & C has 600 employees and operates worldwide.” [grifos meus]


Matéria do Washington Post diz que a NTSB, autoridade norte-americana que investiga acidentes aéreos, está dando uma boa olhada em incidentes recentes envolvendo aviões “computer-centric“, isto é, com controle computadorizado, como os Airbus e o Boeing 777.

Leva água para esse moinho essa descrição de um incidente (não confirmado) que teria acontecido no dia 23, no Japão (também reportado pelo “Unusual Attitude“):

Tuesday 23, 2009 10am en-route HKG to NRT. Entering Nara Japan airspace.

FL390 mostly clear with occasional isolated areas of rain, clouds tops about FL410.
Outside air temperature was -50C TAT -21C (your not supposed to get liquid water at these temps). We did.

As we were following other aircraft along our route. We approached a large area of rain below us. Tilting the weather radar down we could see the heavy rain below, displayed in red. At our altitude the radar indicated green or light precipitation, most likely ice crystals we thought.

Entering the cloud tops we experienced just light to moderate turbulence. (The winds were around 30kts at altitude.) After about 15 sec. we encountered moderate rain. We thought it odd to have rain streaming up the windshield at this altitude and the sound of the plane getting pelted like an aluminum garage door. It got very warm and humid in the cockpit all of a sudden. Five seconds later the Captains, First Officers, and standby airspeed indicators rolled back to 60kts. The auto pilot and auto throttles disengaged. The Master Warning and Master Caution flashed, and the sounds of chirps and clicks letting us know these things were happening.
Jerry S, the Capt. hand flew the plane on the shortest vector out of the rain. The airspeed indicators briefly came back but failed again. The failure lasted for THREE minutes. We flew the recommended 83%N1 power setting. When the airspeed indicators came back. we were within 5 knots of our desired speed. Everything returned to normal except for the computer logic controlling the plane. (We were in alternate law for the rest of the flight.)

We had good conditions for the failure; daylight, we were rested, relatively small area, and light turbulence. I think it could have been much worse. Jerry did a great job flying and staying cool. We did our procedures called dispatch and maintenance on the SAT COM and landed in Narita. That’s it.”


Nesta semana, há expectativa de que a BEA solte um relatório preliminar.

Há um papo nos fóruns de aviação por aí de que, baseado nas características das lesões havidas nos corpos encontrados e no tamanho e estado dos destroços, crescem as apostas na hipótese de que ao invés de se desintegrar no ar o avião tenha caído no mar descontrolado, mas relativamente intacto.


Do “Blog do Servidor“:

Bye Bye Mangabeira

De saída do governo, o ministro Roberto Mangabeira Unger limpa suas gavetas na Secretaria de Assuntos Estratégicos (SAE) até amanhã, terça-feira. Unger não conseguiu prorrogar a licença de professor na Universidade de Harvard e, por isso, terá de retomar imediatamente a carreira acadêmica.

Harvard quer Mangabeira já na quarta-feira.

O ministro concluiu uma série de projetos que tratam da modernização do Estado. Defensor do mérito e do profissionalismo na administração pública, o ministro deixa um legado importante que terá de ser tocado por sua equipe – formada principalmente por gestores governamentais.”


Convenhamos que, para um ministro das ações de longo prazo, Mangabeira tinha um prazo de validade bastante curto.

Ô Idelber, como é que é aí esse negócio de licença de professor universitário nos EUA?  Considerando que ele virou ministro em junho de 2007, Harvard só dá licença de dois anos, não renováveis?

Ou será que é verdade a história de que ele caiu porque queria trocar de partido?

Via Nick Carr:

A team of Israeli research psychologists gave personality tests to 69 Wikipedians and 70 non-Wikipedians. They discovered that, as New Scientist puts it, Wikipedians are generally “grumpy,” “disagreeable,” and “closed to new ideas.”

In their report on the results of the study, the scholars paint a picture of Wikipedians as social maladapts who “feel more comfortable expressing themselves on the net than they do off-line” and who score poorly on measures of “agreeableness and openness.” Noting that the findings seem in conflict with public perceptions, the researchers suggest that “the prosocial behavior apparent in Wikipedia is primarily connected to egocentric motives … which are not associated with high levels of agreeableness.“‘


Gostaria de ver o resultado de um teste desses com blogueiros.  🙂



New MySpace users (N  58) were surveyed on joining the site and again in 2 months to examine psychosocial differences between bloggers and nonbloggers over time. Bloggers’ social integration, reliable alliance, and friendship satisfaction all significantly increased compared to nonbloggers, suggesting that blogging has beneficial effects on well-being, specifically in terms of perceived social support.” [grifo meu]

Esta matéria do Guardian sobre os efeitos da recessão sobre a indústria do sexo no estado de Nevada nos leva a conhecer aquele que é provavelmente o único setor da iniciativa privada nos EUA que ama impostos:

In an effort to shore up their legitimacy, Nevada’s bordellos are virtually unique in the US business world in lobbying for greater taxation, believing they would be harder to outlaw if they made a useful contribution to the public purse. The industry enthusiastically supported a proposal in Nevada’s legislature for a $5 levy on each sexual transaction to help fill up a $3bn budgetary deficit.

Narrowly rejected in a senate committee, the levy would have been the first value-added tax on sex – brothels presently only pay an annual licensing fee and payroll tax.” [grifo meu]


Via Engadget:

It’s not enough that humans gave robots a place to congregate to plan our demise, now we’ve adapted them with the ability to extract fuel from the very nectar of life. All that innocent experimentation with fuel cells that run on blood has led to this, a flesh-eating clock. This prototype time-piece from UK-based designers James Auger and Jimmy Loizeau traps insects on flypaper stretched across its roller system before depositing them into a vat of bacteria. The ensuing chemical reaction, or “digestion,” is transformed into power that keeps the rollers rollin’ and the LCD clock ablaze. The pair offers an alternative design fueled by mice, another contraption whose robotic arm plucks insect-fuel from spider webs with the help of a video camera, and a lamp powered by insects lured to their deaths with ultraviolet LEDs. Man, this is so wrong it has to be right.

A serious newspaper or broadcast news outlet must simultaneously be a mirror and a window to its audience — a look at themselves and an opening to the wider world.”


junho 2009
« maio   jul »
Add to Technorati Favorites

Blog Stats

  • 1.561.556 hits