1) I am not an Engineer, I am a chemist.
2) My point above was to refute someone elses point that pressure does not change with temperature. If you think it doesn't, prove it.
3) And if you don;t believe me that the solubility of CO2 in water increases as temperature decreases, maybe...
wouldn;t you still have to eat enough real food to provide sufficient calories to provide energy for your bodily functions? Seems like you are saying eat just enough to meet your vitamin requirements, but you still need othjer stuff to convert into actual ATP. Seems like your saying eat 1 date...
yes, but first the enemy would have to know what signal is being used to control the system. Jamming is not as simple as filling the airwaves with lots of low level noise, its sually accomplished by pinpointing a known frequency and broadcasting at high intensity over that band. At least this is...
US PAtent 6819531 to Shiroishi teaches a hard disk apparatus having a 50 MB/s transfer rate where the platter is spun at 25,000RPM. The recording density is fairly low (5GB/square inch) compared to slower drives (50-100gb/siquare). But it is fast!
Couple thoughts on this:
1) The targeting and tracking system for a tank based anti-ballistic system would have to be ridiculous to be effective. The targeting/tracking system for this is well well beyond most if not all current systems (the system would have to track hundred of tiny fast...
see below for much better (and certainly more correct) anwer then I gave. Hey! I'm a chemist qith a background in applied magnetic materials..I said I wasn't an EE. Thanks for correcting me guys. :o
Typical hard disc platter composition:
Substrate: glass, polycarbonate, NiAl alloy, or Titanium alloy (only the nickel would be "toxic" because of the heavy metals, but the wort you'd exerience would be nickel itch unless you ate the disc LOL)
underlayers: typically Chromium and/or a Cr...
simple, because humans have been killing each other since we evolved, and probably before then too.
Also, I recently read something about a polymer that rapidly (nanoseconds) hardens when exposed to a point source impact (i.e. a pencil type, doctor blade, or bullet). Its supposedly very...
The reason hard drive platters cannot be, or more accurately, the reason they are not spun faster then they are currently is two-fold:
1) Microwaviness (that is literally what the property is called in the art, I didn't make it up) of a hard drive platter has a direct impact on how fast the...
Server storage for one. (2 huge capacity drives in Raid 1 might be more cost efficient then the 20 or so in a current server rack.
DVD audio for two
Next generation games for three (average install now is ~6 GB, 5 years from now it might be double or triple that
And of course, not to...
Based on the way you asked your question then theoretically there is no limit to storage density for a hard drive based on current magnetic technology or even technology years ago. Technically you could just keep adding platters and heads infinitely and have one huge multiplatter hard drive. No...
My laptop has recently become infected with the spyware known as people on page. I've tried using ad aware and a couple othe r programs to remove it. They detect that its present and tell me its removed, but when I reboot the computer its back again.
Any Idea how to get rid of this...
Well, when you consider that ~99% of all patents are worthless and never get litigated, then it doesn't really matter does it?
Its amazing how many people in here bash the patent system when by their very posts it is evident that they know absolutely nothing about it. (not that I'm saying you...
-Yes and no. The rated on the Media , i.e. 4X 8x is simply an indicator of how fast the media can be reliably spun without significant wobbling. I know I've been harping on this point in here lately, but it really is that important. Micro-waviness of media is a HUGE issue. Flatter and more...
Actually, the vast majority of hard disks are made of primarily High Tg polycarbonate or glass substrate with a magnetic layer formed on the surface (via one or more metallic underlayers). Due to adhesion forces between the metal layers and the substrate the metal is substantially constrained...
Thanks! Glad you found it interesting. Like I said, I examine recording media patent applications at the patent office, so i read about this stuff for about 6 hours a day. Glad to know its going to some use.
-Yes and no. Magnetic domains, while the consist of electrons oriented in particular directions are not typically referred to as charges. But otherwise I think you've got it. As the grain size goes down, the coercivity of each magnetic grain goes down as well. thus, each grains magnetic domain...
Actually, its none of the above reasons. The reaosn why HD manufacturers went to smaller diameter platters is because the flatness of a smaller diameter substrate can be controlled to a more uniform degree then a large diamter substrate. Its a stability issue basically. A hard drive platter...
I concur, typically layer just below the polymer surface of the disc is diamond like carbon or anodized aluminum, both of which can be highly insulative to heat.
Also note: this is assuming a far-field magneto-optical media (one where the laser first passes through the substrate before it...
One other major issue is that while nanodot media might exist which could theoretically contain terabytes of data per square inch, a head or other recording instrument that can read and record at that density does not. Its a resolution problem basically. To read data from a magnetic disc, a...
I examine patent applications for magentic media at the patent and trademark office. The problem you are describing has been around for a long time, as has so called "nanodot" media. This problem is called "intergranular exchange coupling" and contributes to increased noise in high density...
Hmmm... the book stuff you cited seems to help a bit, but it seems to be desribing a quantum well, which is as far I remember a description of an electron in a trapped state as opposed to a quantum confined state. See where my confusion comes from?
Thanks for the reply. As I'm sure you realize from your book this topic is extremely complicated.
You wished clarification as to my general knowledge of semiconductor doping, so here goes. I am quite fluent in doping technologies for bulk semiconductors, and I am familiar with most of the...
Was hoping someone out there could explain the difference between quantum confined (QC) doping and normal doping of semiconductors.
My rather basic understanding is that with normal doping, a carrier (an electron or a hole) is bumped up from the valence band into the conduction band via...
Definitely consider permalloy, coballoy, molyperm or other high saturation low coercivity material. Reade sells these materials in all sorts of physical forms
http://www.reade.com/Products/.../magnetic_powders.html
The alloys you want to look at the correspond to the above trade names are...
Sugar makes stuff sweet because of it reacts with certain receptors on the surface of your tongue. It has nothing to do with neutralizing acid.
Read this and see if it answers your questions: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/T/Taste.html
I'm willing to postulate that if...
might want to clarify that you are talking about a standard 6800, not a 6800 ultra. My albatron came straight from the factory with the core clacked at 410 MHz and 2ns memory
If you get the HD version of either you probably won't notice much difference in picture quality. I went with Directv because of their awesome HD DVR. And don;t believe what your cable company would have you believe. I have only had my satellite go out twice in the past 2 years. The first time...
My system rocks doom 3. NEver ever drops below 30FPS (and some fool on ebay sold me this brand new ultra for sugeested retail price of $499). Seriously, this card rocks for Doom. Only thing thats slowed it down so far is the Dam level in Farcry (where the lava is)
P4 3ghz
1Gb Corsair XMS
AB...
If it was a bad static discharge you could here that pop through your speakers. I've heard my speakers pop when they were not powered on) when a lightning bolt struck about 25 feet from my house.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.