Domain: ohiolink.edu
Stories and comments across the archive that link to ohiolink.edu.
Comments · 8
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compare and contrast!
http://en.wikipedia.org/wiki/P...
High level drug dealer and money launderer.
15 month sentence, didn't even serve all of it.
Male privilege indeed.
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Re:Detecting anthropogenic movement on the surface
GRACE can resolve nearly uncorrelated mascons that are blocks 400km on each side with a noise floor of ~1cm equivalent water height. (This is latitude dependent because GRACE's denser ground tracks near the poles allow for better resolution.) Each mascon has a mass of ~1.6 gigatons, and a fully-loaded coal train is ~10 kilotons, so GRACE falls short by about five orders of magnitude.
The improved laser ranging on the GRACE follow-on will increase sensitivity, and David Wiese analyzes improvements due to lowering the satellites' altitude and/or adding more satellites to the GRACE system.
You're right to suspect that detecting a tiny change in local gravity is limited by uncertainties in models such as atmosphere dynamics. I've discussed how GPS occultation data (among many other data sources) can be used to reduce these uncertainties.
Other anthropogenic effects such as groundwater depletion can already be detected with GRACE. Rodell et al. 2009 (PDF) and Tiwari et al. 2009 (PDF) observed this in northern India, and Famiglietti et al. 2011 (PDF) recently observed similar groundwater depletion in California.
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Re:His Master's Voice
Actually that "CancerX" drug all the newspapers were talking about appears to be DMAT, which you can buy here. I mean the the guy doesn't seem to have published anything about CancerX besides on his webpage. He filed a patent in 2009 which is about using DMAT or TBB to inhibit the enzyme Casein Kinase 2 (CK2), and had a PhD student do her dissertation work on the same thing which was completed in 2008. Since DMAT was actually first synthesized in 2004 for the very purpose of inhibiting CK2 to decrease cell proliferation, and there have been numerous papers on using DMAT for this purpose (you can see these by searching for DMAT CK2 in pubmed or google) I find it hard to believe that this was a serendipitous discovery. If you do the pubmed/google search and look for the institutes where the DMAT studies have been done you'll notice they are pretty much all based in Europe. So it seems to me that these other groups failed to patent the use of this drug for whatever reason and this guy is taking advantage of that while making up a new name along with some story about accidentally discovering its anti-proliferative properties as a self-marketing ploy. Possibly to encourage funding or somehow support his patent rights.
That said he is a biochemist working on anti-coagulants and DMAT is basically a nucleotide analogue (nucleotides are involved in blood clotting) so its possible he synthesized/designed the drug himself at some point for that purpose. I don't really know anything for sure except that calling it CancerX is shady, and talking to the newspapers before publishing is shady.
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Re:Nothing new here
This wireless charging/powering is by no means a new technique. My masters thesis included plenty of material and research on this topic, and I was referencing papers on wireless powering for implants as far back as the 70's. The class-E amplifier driving an inductive coil resonantly tuned with a receiving coil is the standard architecture used by decades.
I'm confused at the submitter's hailing 'resonant coupling' as a (seemingly) recent advance, as resonant coupling is simply what happens whenever a tuned transmitter and receiver antenna communicate. In communications devices, the tuning is broad so that the receiver takes in a wide range of frequencies which are filtered out down the line. In power transmission devices, the tuning is much more narrow, as only a single frequency (the power wave) is transmitted.
Ironically, [please tell me I've used that word correctly] what makes wireless powering and charging more feasible today than 20 years ago is not an improvement in the electromagnetic theory of wireless power. Rather, it is a combination of a reduction in the power requirements of the receiving device due to advances in low-power electronics, as well as an improvement in evolution-based software which can simulate and design better and better directed antennas--something which by-hand design has never been able to do. All in all, though, it's a nice demo but isn't much in the way of new and useful science. -
Re:Mid Range Wireless
For my Masters Thesis, I designed a wireless powering system for a fully implanted bio-monitoring device for a mouse running around, untethered, in a cage. Now, a mouse is actually quite small, so our implant had to be about the size of a U.S. dime (actually, a bit smaller). The mouse was never more than a few cm away from the cage floor, but could move around, stand up, roll over, etc., so we could not make the powering system very "directed" in nature. As a result, our optimized average power coupling efficiency we near 0.08% (Page 25, specs on Page 95), which was actually pretty good for the application. It did mean that our implant needed to be extremely low-power, however, involving all sorts of power supply optimizations (Chapter 3), MEMS sensors, and the like.)
The problem with trying to power your wireless devices anywhere in a room is similar, due to the fact that you can move around and change the orientation of your devices. As the ratio of power-receiving-antenna to "cage" is even lower, you are likely looking at even lower power efficiencies. Yes, you can perform all sorts of fractal antenna optimizations and the like, but, if you want to be able to receive power anywhere in the room, then you are limited by the laws of physics: If your powering system covers the whole room, your efficiency is limited by the simple ratio of the area of your receiving antenna in the plane parallel to the floor (or wherever you place your powering system) to the area of the powering antenna itself.
The recent demos of wireless power by Intel and others have all involved highly directed powering antennae, where moving the receiver even a small amount cuts off the power supply. Directed power does have its uses, however. Imagine medical implants that can be powered in a short time by placing a directed antenna on your skin each morning, or even wearing a battery pack on your belt with a directed antenna to power a device with a built in radio communicator. No (highly infectable) wires penetrate the skin, no surgery is necessary to replace batteries that run low, and, even in the worst cases, you should still be able to remove the battery back for a time to perform certain functions (exercising, bathing) without losing device functionality. -
Re:HiroshimaTell me when the actual research articles are available in a refereed journal. OK!
Also, you may want to check the lead researcher's other research. Turns out it's all published in a lot of "refereed journals" and comes to the same types of "evidence-based" conclusions. Fancy that! -
Porphyrin chemistry is very interesting...
Porphyrin chemistry is very interesting and has been studied for over 100 years. This news is both exciting and old news, because porphyrins and related isomers have been the subject of continued research. For very detailed information about porphyrin chemistry, refer to The Porphyrins edited by David Dolphin. Also, review the research of Martin Gouterman. In biological systems, porphyrins are found commonly in heme-type proteins used for oxygen transport and cytochrome P450 in the liver for metabolizing biological compounds including pharmaceutical products, and as chlorophyll in plants. Porphyrins have served as catalysts for organic reactions in industry, photodynamic therapy for cancer, molecular devices including sensors and switches, and model compounds for the active sites of enzymes. My thesis, which available for download through OhioLink:
http://www.ohiolink.edu/etd/view.cgi?akron11339504 18
details the photophysical characterization of N-Confused tetraphenylporphyrin and characterization of zinc N-Confused tetraphenylporphyrin.
Upon reading this post on Slashdot, I was pleasantly surprized that the subject of my thesis has some similarities to a related compound that could be used for further research into catalyzing an energy source. In one way I'm surprized, and in another I'm not, and I'm glad that one of the Slasdot crowd submitted the post. Porphyrin chemistry is vast, interesting, and complex.
Happy reading! -
Re:Someone is looking at this page and...
It is indeed a bit misleading. I think i found the entire thing, and it's 81 pages long.