Follow Slashdot stories on Twitter

 



Forgot your password?
typodupeerror
×

Comment Re:This is so 1990s (Score 1) 132

"normal people don't care about the OS". So? Why are you even bringing up "norms"? They don't come here, they don't know how to spell "OS", and don't know that a good OS can keep everything working like a fine watch ... or keep crashing your all-important app. You sound like a "norm" that's stumbled in here, and trying to sound "technical".

Submission + - DARPA Develops Stealth Motorcycle for US Special Forces

Hugh Pickens DOT Com writes: Allen McDuffee reports that DARPA is developing a hybrid-powered motorcycle to soundlessly penetrate remote areas and execute complex, lightning-fast raids. The idea is to develop a hybrid power system that relies on both electric and gas power, allowing special ops to go off-road and zip past enemy forces with the silence of an electric engine, while also being able to handle extended missions and higher speeds with a supplemental gas tank. "Quieted, all-wheel-drive capability at extended range in a lightweight, rugged, single-track vehicle could support the successful operations of U.S. expeditionary and special forces in extreme terrain conditions and contested environments,” says Wade Pulliam of Logos Technologies which was awarded a contract for a preliminary design to see just how viable the project is. “With a growing need to operate small units far from logistical support, the military may increasingly rely on adaptable, efficient technologies like this hybrid-electric motorcycle.” Logos plans to fit its quieted, multifuel hybrid-electric power system with an all-electric bike from San Francisco-based manufacturer BRD Motorcycles that uses an existing (and what BRD calls “barely legal”) racing bike, the RedShift MX, a 250-pound all-electric moto that retails for $15,000. The RedShift MX has a two hour range, but will be extended with a gas tank the size of which will be determined by the military in the research period. The focus on the electric element suggests that DARPA is more concerned with the stealthiness of the motorcycle than it is efficiency. “The team is excited to have such a mature, capable system from which to build, allowing an accelerated development cycle that could not be achieved otherwise,” says Pulliam.

Comment Re:Random thoughts... (Score 2) 193

30 minutes? After driving for a couple of hours, I'm ready to take a 30 minute break and stretch my legs...

Hydrogen? Seriously? 45 years ago, when I was little, they were saying Hydrogen was only 30 years away, and would roll out demo cars to prove it. I think they just said the same thing last week.

I used to think the same thing, until I actually looked at the engineering realities regarding hydrogen. It's the lightest and smallest element on the Periodic Table, so it will migrate through steel, making it brittle as it goes. The only way to make hydrogen in the industrial quantities needed is with steam reforming of petroleum based hydrocarbons (check Wikipedia if you don't believe me). Then there is the energy density and storage nightmare of hydrogen which isn't even nearly as good as current gen car batteries.

And that is just to replace the current fuel in an internal combustion engine (not so efficient) with a lower density fuel (even worse efficiency). Now a fuel cell, where the fuel is converted directly into electricity is promising, except that to produce the amount of power needed to drive a vehicle would require an oxidation rate right up there with a controlled explosion trying to go uncontrolled.

And you still haven't gotten away from using petroleum, or the wars,corruption and crime involved in dealing with it. So, hydrogen isn't really looking too good now, is it?

I would think that just changing the power generation method for a hybrid from an IC engine to a micro-turbine generator, with it's higher efficiency, flex fuel capability, fewer and more reliable parts, would provide the fast recharge capability that you say you want. In fact, some companies are starting to do this already. Neil Young's LincVolt was such a conversion, by H Line Conversions in Wichita, KS.

But I think that, except for niche applications, the end of life for the internal combustion engine is in sight. It has to be over-sized and over-built for performance use, and can't compare (favorably) to microturbines for power generation. They are expensive, complicated, dirty, and require an expensive and violently fought over fuel.

Comment Re:Isn't this a lot like programming? (Score 1) 107

No, biological processes are inherently non-deterministic, and this becomes more apparent the smaller the scale. At the genetic level, it's all about probabilities. I suppose you could argue the same about computation since circuits are now getting small enough for quantum effects to show up, but I don't think most programmers are explicitly modeling random bit flips! On large scales, when you're talking about big programs with lots of different possible inputs, it's often more effective to model them statistically, I agree, but the underlying processes are still quite different.

Comment Re:Next goals: (Score 3, Insightful) 107

Co-evolution only looks "co" on very large timescales; every new trick our immune systems have come up with has been in response to something a pathogen already came up with. Sure, there always can (and will) be new plagues, whether the victims are trees or people. I just think they're a whole lot more likely to come from the nigh-uncountable number of random "experiments" taking place in the wild than they are from anything done in a lab.

Comment Re:In other words... (Score 1) 284

Corporations don't go to prison for violating censorship laws. The members of the group, employees, owners, and members go to jail. They are the ones who have their assets taken.

That last bit would be a lot more persuasive if it weren't for the concept of limited liability. The whole idea of corporations owning assets, signing contracts, etc. is that the owners of the corporation are to some degree insulated if the corporation "does" something such as breaking a contract that could lead to the loss of those assets--but it really ought to work both ways. As things stand right now, the privilege pretty much only seems to go one way.

Comment Re:Next goals: (Score 4, Informative) 107

Honestly, I think that fear is overblown. Vertebrate pathogens have had hundreds of millions of years of optimization in the most ruthlessly selective "laboratory" ever known, and while there are obviously some pretty deadly ones out there they haven't managed to wipe us out yet. Nothing we do in a lab is likely to come close, in terms of coming up with something that can spread wildly on its own.

I used to work between a synthetic bio lab at one end of the hall and an infectious disease lab at the other. Ask which one scared me more.

Comment Re:Isn't this a lot like programming? (Score 2) 107

In a lot of ways, it is similar, but there are some important differences. The biggest one, I think, is that programs are (or had better be!) deterministic: make a particular change and a particular thing will happen every time. Living systems, even relatively simple ones like yeast cells, are stochastic: make a particular change and the probability of a particular thing happening increases or decreases. What you're counting on when growing a culture of mutated cells is that enough of the cells will behave in the desired fashion to make the behavior of the colony predictable, but the underlying randomness remains.

Comment Re:Whatabout we demand equal time of our views ins (Score 4, Informative) 667

Being a scientific organization is one of the major listed justifications for tax exempt status - assuming the other criteria are met.

The part in bold there is kind of the point. Scientific organizations--actually educational organizations of all kinds--can indeed apply for non-profit status, but they have to prove they meet the standards. Churches are assumed to qualify a priori.

Comment Re:"Creationists" (Score 1) 220

The AC does have a point: "creationism" (and "intelligent design") are potentially ambiguous terms to people who aren't engaged in the evolution debate.

Then if they want to engage in that debate, they should learn how those terms are used. AC's sub-Objectivist ranting doesn't make me think he's interested in that level of intellectual effort, though.

Slashdot Top Deals

Thus spake the master programmer: "After three days without programming, life becomes meaningless." -- Geoffrey James, "The Tao of Programming"

Working...