And would Dutch Elm disease be reclassified as a computer virus or a buffer exploit?
The researchers built the device — which uses about one-billionth the electric current needed to power a hair dryer — while exploring how to use quantum dots, which are bits of semiconductor material that act like single atoms, as components for quantum computers
The device demonstrates a major step forward for efforts to build quantum-computing systems out of semiconductor materials, according to co-author and collaborator Jacob Taylor, an adjunct assistant professor at the Joint Quantum Institute, University of Maryland-National Institute of Standards and Technology. "I consider this to be a really important result for our long-term goal, which is entanglement between quantum bits in semiconductor-based devices" Taylor said
The researchers fabricated the double quantum dots from extremely thin nanowires (about 50 nanometers, or a billionth of a meter, in diameter) made of a semiconductor material called indium arsenide. They patterned the indium arsenide wires over other even smaller metal wires that act as gate electrodes, which control the energy levels in the dots
To construct the maser, they placed the two double dots about 6 millimeters apart in a cavity made of a superconducting material, niobium "This is the first time that the team at Princeton has demonstrated that there is a connection between two double quantum dots separated by nearly a centimeter, a substantial distance" Taylor said
When the device was switched on, electrons flowed single-file through each double quantum dot, causing them to emit photons in the microwave region of the spectrum. These photons then bounced off mirrors at each end of the cavity to build into a coherent beam of microwave light
One advantage of the new maser is that the energy levels inside the dots can be fine-tuned to produce light at other frequencies, which cannot be done with other semiconductor lasers in which the frequency is fixed during manufacturing, Petta said. The larger the energy difference between the two levels, the higher the frequency of light emitted
"In this paper the researchers dig down deep into the fundamental interaction between light and the moving electron" Gmachl said. "The double quantum dot allows them full control over the motion of even a single electron, and in return they show how the coherent microwave field is created and amplified. Learning to control these fundamental light-matter interaction processes will help in the future development of light sources"
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According to Cambridge Historian Richard Toye, Churchill was a “closet science-fiction fan” who borrowed the lines for one of his most famous speeches from H. G. Wells — to depict the rise of Hitler's Germany. "It's a bit like Tony Blair borrowing phrases from Star Trek or Doctor Who," says Toye. A close friend of Wells, Churchill said that The Time Machine was “one of the books I would like to take with me to Purgatory”. Wells and Churchill met in 1902 and several times thereafter, and kept in touch in person and by letter until Wells' death in 1946. "We need to remember that there was a time when Churchill was a radical liberal who believed these things," Toye adds. "Wells is often seen as a socialist, but he also saw himself as a liberal, and he saw Churchill as someone whose views were moving in the right direction."
If, like me, you administer FreeBSD systems, you know that (like Linux) there is an embarrassment of riches when it comes to filesystems. GEOM, UFS, soft updates, encryption, disklabels — there is a *lot* going on here. And if, like me, you're coming from the Linux world your experience won't be directly applicable, and you'll be scaling Mount Learning Curve. Even if you *are* familiar with the BSDs, there is a lot to take in. Where do you start?
You start here, with Michael W. Lucas' latest book, "FreeBSD Mastery: Storage Essentials". You've heard his name before; he's written "Sudo Mastery" (which I reviewed previously), along with books on PGP/GnuPGP, Cisco Routers and OpenBSD. This book clocks in at 204 pages of goodness, and it's an excellent introduction to managing storage on FreeBSD. From filesystem choice to partition layout to disk encryption, with sidelong glances at ZFS along the way, he does his usual excellent job of laying out the details you need to know without every veering into dry or boring.
Do you need to know about GEOM? It's in here: Lucas takes your from "What *is* GEOM, anyway?" (answer: FreeBSD's system of layers for filesytem management) through "How do I set up RAID 10?" through "Here's how to configure things to solve that weird edge-case." Still trying to figure out GUID partitions? I sure as hell was...and then I read Chapter Two. Do you remember disklabels fondly, and wonder whatever happened to them? They're still around, but mainly on embedded systems that still use MBR partitions — so grab this book if you need to deal with them.
The discussion of SMART disk monitoring is one of the best introductions to this subject I've ever read, and should serve *any* sysadmin well, no matter what OS they're dealing with; I plan on keeping it around for reference until we no longer use hard drives. RAID is covered, of course, but so are more complex setups — as well as UFS recovery and repair for when you run into trouble.
Disk encryption gets three chapters (!) full of details on the two methods in FreeBSD, GBDE and GELI. But just as important, Lucas outlines why disk encryption might *not* be the right choice: recovering data can be difficult or impossible, it might get you unwanted attention from adversaries, and it will *not* protect you against, say, an adversary who can put a keylogger on your laptop. If it still make sense to encrypt your hard drive, you'll have the knowledge you need to do the job right.
I said that this covers *almost* everything you need to know, and the big omission here is ZFS. It shows up, but only occasionally and mostly in contrast to other filesystem choices. For example, there's an excellent discussion of why you might want to use FreeBSD's plain UFS filesystem instead of all-singing, all-dancing ZFS. (Answer: modest CPU or RAM, or a need to do things in ways that don't fit in with ZFS, make UFS an excellent choice.) I would have loved to see ZFS covered here — but honestly, that would be a book of its own, and I look forward to seeing one from Lucas someday; when that day comes, it will be a great companion to this book, and I'll have Christmas gifts for all my fellow sysadmins.
One big part of the appeal of this book (and Lucas' writing in general) is that he is clear about the tradeoffs that come with picking one solution over another. He shows you where the sharp edges are, and leaves you well-placed to make the final decision yourself. Whether it's GBDE versus GELI for disk encryption, or what might bite you when enabling soft updates journaling, he makes sure you know what you're getting into. He makes recommendations, but always tells you their limits.
There's also Lucas' usual mastery of writing; well-written explanations with liberal dollops of geek humour that don't distract from the knowledge he's dropping. He's clear, he's thorough, and he's interesting — and that's an amazing thing to say about a book on filesystems.
Finally, technical review was done by Poul Henning-Kamp; he's a FreeBSD developer who wrote huge parts of the GEOM and GBDE systems mentioned above. That gives me a lot of warm fuzzies about the accuracy of this book.
If you're a FreeBSD (or Linux, or Unix) sysadmin, then you need this book; it has a *lot* of hard-won knowledge, and will save your butt more than you'll be comfortable admitting. If you've read anything else by Lucas, you also know we need him writing more books. Do the right thing and buy this now.
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Valérie Pécresse, a minister under former President Nicolas Sarkozy, said France needed its own version of the USA Patriot Act, which gave the United States more authority to collect intelligence and pointed America’s surveillance apparatus at its citizens. Politicians and civil rights advocates on both sides of the Atlantic bristled at that suggestion, and at a string of arrests in which French officials used a new antiterrorism law to crack down on what previously would have been considered free speech.
Dominique de Villepin, the former French prime minister, warned against the urge for “exceptional” measures. “The spiral of suspicion created in the United States by the Patriot Act and the enduring legitimization of torture or illegal detention has today caused that country to lose its moral compass,” he wrote in Le Monde, the French newspaper.
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Don't forget mouse condoms, those are v. important in a shared enviro!
Thats fairly common with IT install projects. Between mission creep and idle time (usually caused by mission creep and work outage disputes) its surprising anything gets done on these contracts. Install projects take a special kind of insanity to manage.
I'm not sure about Australia, but in the US schools also spend tons on electronics, but can't afford textbooks
Have you tried http://www.ck12.org/student/ CK-12? Or even The Khan Academy...there are tons of professional quality resources out there.
And those '47%-ers'? The vast majority of them are in one of two categories: a) enlisted in the military, or b) retired
Sorry to burst your bubble but, the enlisted ranks must pay federal tax on their earnings. At their (below E-4) pay rate they most certainly fall into poverty level and most get everything back after filing their return. You should see what a Private makes, minimum wage would be nice.
Put both Clinton and Shatner on the ship and see who can score the most green chicks / moon maidens / Venusian Princesses. We might not be able to conquer the aliens through force but, we can out breed them with the above tag team. Of course wars then might be fought over who has the best hair.
now, now, no need to be rude! Or were you just channeling Kevin Cline from "A Fish Called Wanda"?
It's deja vu all over again. In the other period of American history where corporate money had much undue influence, labor unions arose. The businesses hired thugs to terrorize and even execute labor union leaders.
And now its the labor union thugs doing terrorizing...for the people of course.
Hermit crabs will live in anything they can get their ass into and fully hide under. I've seen them "wear" bottle tops and in one case a plastic cup.
I don't know about anywhere else but, the hermit crabs out here aren't hurting for shells. The problem should be even worse as they are in competition with young coconut crabs too.
My town paper http://www.statesman.com/business/survey-texas-companies-with-broadband-internet-outperform-those-1686241.html was nice enough to give them some coverage. See if you can spot the errors.