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Comments

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Japan Grounds Fleet of Boeing 787s After Emergency Landing

spirito Re:This can't be true (180 comments)

Only Li batteries have the energy density required for Boeing "more electric" aircraft concept (http://www.designnews.com/document.asp?doc_id=222308).

about a year and a half ago
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Climate Treaty Negotiators Are Taking the Wrong Approach, Say Game Theorists

spirito Re:Climate Treaty Negotiation Must Fail (227 comments)

So I see the viable solution being to wait a few decades while continuing to observe the Earth's climate. If there is near future harm from global warming, we should see it by then.

Yes, and it will be too late to do something about it.

about 2 years ago
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Wielding Supercomputers To Make High-Stakes Predictions

spirito (No subject) (65 comments)

This is a topic of great interest in aerodynamics. Aim is to understand how uncertainties in the input data (flow conditions, geometric imperfections, ....) affect the predicted aircraft performances. Some research has already taken place in Europe, for example see the project nodesim (http://www.nodesim.eu).

more than 2 years ago
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Taking Radioactive Contaminants From Water With Shells

spirito Re:Did anyone else double take (50 comments)

rm -rf radioactivity perhaps? Seriously, if you don't know the basics, do not post on slashdot!

more than 3 years ago
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Global Observer's First Hydrogen-Powered Flight

spirito Polluting (34 comments)

I thought that releasing watrer vapor (as hydrogen engines do) is very bad for the environment, at that altitude ( 55,000 to 65,000 feet).

more than 3 years ago
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Supercomputing, There's an App For That

spirito marketing (66 comments)

This is just marketing at work. from TFA: The real impact of the system may come in the application of these methods to aircraft or automobiles, which use control systems to react to inputs from the environment in order to achieve optimal safety and performance. Examples include traction control in cars and stabilization systems in jet fighters. “If you have sensors feeding in data to the reduced order model system, then it could solve the equation corresponding to the input data, and indicate the appropriate response in real-time based on the calculations you performed on a supercomputer,” This is how things work already: control systems on a jet fighters do not solve a CFD problem to know how to control the plane, they have a built in model (yeah, "reduced order", if you want to call it this way) that approximate the actual behavior of the plane. Doing it on a smartphone is useless. Furthermore the article has no details on how the error bounds are claculated.

about 4 years ago
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100 Million-Core Supercomputers Coming By 2018

spirito Re:Limits on simulation. (286 comments)

You are right, fluid dynamics simulations parallelize beautifully, but once you start increasing the number of cores the communication between machines will slow things down. And you can have implicit, time accurate, temporal schemes for which the stability condition is (theoretically) CFL less than infinity. But it's clear that if you want to resolve turbulence time scales (and length scales) on a complicated case with relatively high Reynolds number a 100 million processor machine may not be enough.

more than 4 years ago
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Ultra-Dense Deuterium Produced

spirito Re:It's also good for practical jokes (355 comments)

That's why it is always better to do calculations by hand. Considering the big mass of the object you can discard drag effects. This leaves you with a uniform acceleration situation. Consideing a=9.81 m/s^2 and an height of 324 meters, this gives an impact speed of 80 m/s = 288 Km/h. This is obviously independent of the mass (http://en.wikipedia.org/wiki/Inertial_mass#Equivalence_of_inertial_and_gravitational_masses) of the object since we discard drag.

more than 5 years ago

Submissions

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Roundup tolerant GM maize linked to tumor development

spirito spirito writes  |  about 2 years ago

spirito (1552779) writes "The first animal feeding trial studying the lifetime effects of exposure to Roundup tolerant GM maize, and Roundup, the world's best-selling weedkiller, shows that levels currently considered safe can cause tumors and multiple organ damage and lead to premature death in laboratory rats, according to research published online today by the scientific journal Food and Chemical Toxicology."
Link to Original Source
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Swedish physicists confirm LENR

spirito spirito writes  |  more than 3 years ago

spirito (1552779) writes "Two Swedish physicists recently supervised a new test on the E-cat, a device capable of producing energy using nickel powder, water vapor and "secret" catalysts. In the report they write: “Any chemical process should be ruled out for producing 25 kWh from whatever is in a 50 cubic centimeter container. The only alternative explanation is that there is some kind of a nuclear process that gives rise to the measured energy production.” In the used powder 10% copper was found."
Link to Original Source
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KDE 4.5 released

spirito spirito writes  |  more than 4 years ago

spirito (1552779) writes "A new major version of the KDE desktop environment has been released.
"More than 16,000 bugs have been fixed, and many feature requests have been filled. (..) Plasma 4.5.0's new notification system is one example here. It is designed to get less in your way, yet to support your workflow as smoothly as possible. Visually, the striking monochromatic icons make for a more consistent look in the notification area. A highlight of the KDE Applications 4.5.0 is surely Marble, which can now be used for map routing as well as viewing. The Konqueror web browser can now also use the WebKit engine to render its content.""

Link to Original Source

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