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Comment: Re:Rising transportation costs (Score 2) 149

by Tom Womack (#43861123) Attached to: Casting a Harsh Light On Chinese Solar Panels

Transportation across the Pacific is scarily cheap; it's about a thousand dollars for a container that holds about twenty tons, so five cents per shirt.

This is because it's done with a big boat, and boats are amazingly efficient; five thousand containers use about a fifty-megawatt engine for about two weeks, that's twenty kilowatt-weeks (a couple of tons) of fuel to take each container to China or back. You're adding the price of about a cup of super-cheap marine fuel per shirt per direction.

Remember that shipping wheat from Egypt to Rome was cost-effective with sailing ships two thousand years ago!

Comment: Re:This is awesome (Score 2) 99

by Tom Womack (#42642493) Attached to: NASA Achieves Laser Communication With Lunar Satellite

The laser-tracking protocol is defined to run at 25 pulses a second; pulling them back and forward by tiny amounts, to take advantage of the electronics in the orbiter that are designed to measure tiny time differences in order to do the LIDAR altimetry, is a really nifty classic NASA hack.

But the press release did not make a good job of pointing out that NASA were working under that restriction. Obviously if you were trying to do laser communication you'd do something else; ESA have done 50Mbit/second laser communication from low-Earth orbit to geostationary and from geostationary back to Earth, with their Artemis satellite.

Comment: Re:SoC (Score 1) 60

Yes, an SoC is a significantly bigger job than a pure CPU core. But Intel hasn't been producing pure CPU cores for a long time; an Ivy Bridge has a large GPU, a collection of video accelerators, two DDR3 controllers, a PCIe 3.0 interface, and quite a fancy power-management microcontroller. The die is less than 50% occupied by CPU cores.

Comment: Re:I just saw the opposite (Score 1) 252

by Tom Womack (#41546577) Attached to: Intel CPU Prices Stagnate As AMD Sales Decline

Similarly, I built a two-socket Opteron machine out of ebay parts a few years ago; companies are really bad at realising the value in the components in equipment that they're getting rid of, so quad-core dual-socket Opteron processors that sold for four figures new were two for $99. A current similar effect is happening with the slower-speed Infiniband interconnects from decommissioned supercomputers; DDR Infiniband (20gbit/second and much lower latency than 10GbaseT ethernet) cards are pocket-money cheap on ebay.

Comment: Re:Depends on the consumer. (Score 1) 252

by Tom Womack (#41546561) Attached to: Intel CPU Prices Stagnate As AMD Sales Decline

I have a quad 6168 in my shed; I do very parallel number-theory jobs, and it's really very good at those.

But for my work each core offers less performance than one hyperthread of a current i7; my 48-core machine is comparable to about 20 cores of Ivy Bridge. For the cases where I'm not taking full advantage of the 6168's amazing memory and interconnect bandwidth (and I don't have enough of those to keep the machine busy), I'd be getting the same performance for half the price with five i7/3770K boxes; they'd take more space and a bit less electricity. I'm hoping the 6168 will keep working for several more years, but I can't see why its successor wouldn't be a pile of haswell+1 machines.

Comment: Re:Catastrophe (Score 1) 926

And how does your yield compare to an equal area being farmed competently by people working for Archers-Daniel-Midland?

I have a garden, it's probably the most expensive luxury item I own; it cost me about £40,000 on the price of the house compared to getting a similar-sized apartment with no garden in a similar area, say about £200 a month on the mortgage. It produces enough tomatoes for my purposes, and they are tasty tomatoes; but £200 a month buys from Tesco enough tomatoes for a hundred people's purposes.

Comment: Re:The poor will always be with us (Score 1) 315

by Tom Womack (#41289613) Attached to: Space Vs. Poverty Debate In India

If I remember rightly, India has a reasonable number of large cities; what is it that stops people with irredeemably awful prospects in Bihar from getting on a train and becoming people with irredeemably awful but less walled-in prospects in Delhi?

People with irredeemably awful prospects in Gansu have been getting on a train and turning into people with quite decent prospects in Shenzhen by the dozens of millions for the last twenty years.

Comment: Re:Going to space (Score 1) 315

by Tom Womack (#41289529) Attached to: Space Vs. Poverty Debate In India

If you want satellite images, you can write a cheque to DigitalGlobe without much difficulty, and spend money on training local imagery-analysts to be good at producing the information that your planners and developers need.

If you want your own satellite that you can task, you can write a cheque to Astrium who will build you one, and another cheque to get Starsem to launch it from Guyana.

You don't need to develop your own rocket to get the satellite goals; and the technology involved in actually building rockets has only one spin-off use on the ground. Admittedly, nuclear deterrence is a pretty awesome spin-off use if you've got Pakistan on your western border.

Comment: Re:Space vs. Poverty? (Score 1) 315

by Tom Womack (#41289465) Attached to: Space Vs. Poverty Debate In India

Alternatively, you've taken some smart programmers who could be working on designing better interfaces for web sites connected with the poverty-alleviation programme, and you've got them designing interfaces for the ISRO miscellaneous small item procurement internal website. You're taking people who could be working on complicated investment strategies allowing Grameen bank to do more good with its resources, and you're using their time to design low-thrust trajectories for Lunar injection. You're taking fluid-dynamicists who could be working on the feedstocks for the big dams in Kashmir, to get a few more megawatts out of the turbines with the same volume of water, and getting them to work on the manifolds for the turbines pumping high-pressure hydrazine.

The money doesn't go away, but it's no more use than if you were spending that much to train people to be chess grandmasters or marathon runners or professors of analytic number theory - experts in fields of self-referential inutility.

United States

+ - Coca-Cola and Pepsi Change Recipe to Avoid Cancer Warning-> 1

Submitted by jones_supa
jones_supa (887896) writes "California has added 4-methylimidazole (a caramel coloring) to the list of carcinogenic compounds that require an explicit warning when added to foodstuffs. Incidentally, this has entailed the big two cola beverages to modify the recipe to decrease the amount of the substance, just enough to avoid the warning. The change to the recipe has already been introduced in California but will be rolled out across the US to streamline manufacturing. The American Beverage Association noted that there is not enough evidence to show the coloring to cause cancer in humans."
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Programming

+ - Building Expression Evaluator with Expression Trees in C# – Part 1->

Submitted by Anonymous Coward
An anonymous reader writes "This is first part of a series about writing expression evaluator in C#. Even though there are several of them available already I decided to write my own as this one is based on expression trees and is very simple. The evaluator supports numeric expressions as well as expression with parameters.

In this part we will build a simple expression evaluator which will support expressions like this: “2+2, “2.7+3.2, “1.7+2.9+14.24+6.58, “84+15+4-4*3*9+24+4-54/3-5-7+47, “25/3+1.34*2.56+1.49+2.36/1.48, etc. It will however not be able to parse expression with parentheses or with variables. These features will be implemented in the coming posts."

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Medicine

+ - LSD can treat alcoholism-> 1

Submitted by ananyo
ananyo (2519492) writes "LSD has potential as a treatment for alcoholism, according to a comprehensive retrospective analysis of studies published in the late 1960s and early 1970s (http://www.nature.com/news/lsd-helps-to-treat-alcoholism-1.10200).

The researchers sifted through thousands of records to collect data from randomized, double-blind trials that compared one dose of LSD to a placebo. Of 536 participants in six trials, 59% of people receiving LSD reported lower levels of alcohol misuse, compared to 38% of people who received a placebo (full paper (PDF) http://jop.sagepub.com/content/early/2012/03/08/0269881112439253.full.pdf+html). The study adds to the weight of evidence that hallucinogenic drugs may have important medical uses, including, for example, the alleviation of cluster headaches (http://science.slashdot.org/story/11/06/28/0416208/lsd-alleviates-suicide-headaches)."

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Robotics

+ - Hong Kong dentist to explore Egyptian pyramids with his robotic tools->

Submitted by asavin
asavin (2516080) writes "Ng Tze-chuen, a 59-year-old dentist, is teaming up with Egypt's former antiquities minister to explore the Pyramids of Giza.

To do this, he's invented a tiny insect-sized robot with dental forcep-inspired grips on the top. This will be used to travel between the cracks on two mysterious doors blocking a tomb."

Link to Original Source
Windows

+ - Is Onlive pirating Windows and will it cost them?->

Submitted by Anonymous Coward
An anonymous reader writes "When Onlive, the network gaming company, started offering not just Microsoft Windows but Microsoft Office for free on the iPad, and now on Android, it certainly seemed too good to be true. Speculation abounded on what type of license they could be using to accomplish this magical feat. From sifting through Microsoft’s licenses and speaking with sources very familiar with them, the ugly truth may be that they can’t."
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