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This Day in History -1789: Sir William Herschel discovered Saturn's moon, Enceladus. 1830: The first locomotive in the U.S. to carry passengers, the "Tom Thumb," carried 26 passengers 13 miles over the tracks of the B&O Railroad. 1845: The first issue of the Scientific American was published by Rufus Porter ...more
Equine Kingdom: My daughter Sally's horse riding business website - lots of info
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While it has nothing to do with electronics, I ran across a surprising (to me) article regarding oil consumption in new cars. Industry-wide specs claim that 1 quart per 600 to 1,000 miles is the norm. That accounts for blow-by past piston rings, seepage past valve guides, or other means. Catalytic converters prevent the old tell-tale bellowing of blue smoke due to oil burning, so in newer cars it is not as apparent. The topic came up when the owner of a 2007 Toyota Solara complained that his engine was going through a quart every 2,000 miles. My 2007 Chevy Cobalt (2.2L, 34 mpg) loses almost no oil between 3,000-mile changes. Here is a similar statement on oil consumption.
Now your running shoe can converse with other shoes - what a missed opportunity for Converse!. The VectraSense Verb for Shoe's embedded computer automatically adjusts the shoe to your feet, syncs with your PC, and communicates with the Verb for Shoes of fellow wearers to exchange contact information. Price: A mere $700.
This 1.5 MV home brew Tesla coil is the handiwork of John Miles and his team, initially built for use in a Halloween spook house. The primary is 6 turns of #6 AWG solid copper; the secondary is 700 turns of #22 polythermalized magnet wire wound on a 20" diameter cardboard form at a spacing of 10 turns per inch. A 14.4 kV, 5 kW power-pole transformer fed power to its 10-pole, 3,000 rpm rotary spark gap. Click here to buy a Tesla coil of your own, if you do not have time and/or resources to roll your own.
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"You guys, this is one of the elements in the period table - I'm not sure if that's in our jurisdiction to be banning a whole element." - Patrick Moore, co-founder of Greenpeace, re extremism of banning chlorine (go to 3:00 minutes)
I wish I understood Japanese and knew what these guys are saying. Evidently, building and operating giant air vortex guns is great sport in Japan. Adding smoke to the mix for enhanced visualization gives it a cool, menacing, sci-fi look.
Featured Book
Microwave System Design Tools and EW Applications w/CD-ROM
Back when personal computers were new to the world and Basic was the common man's programming language of necessity, there were hundreds of new little applets that kept popping up to solve specific calculation tasks. It was great sport, as well as a display of mental cunning, to develop such programs and then figure out a way to make them available to the public. Remember that at the time (early to mid 1980s) a TRS-80 or a Commodore 64 would set you back a couple hundred dollars, and the Internet was just a gleam in Al Gore's eye.
Eventually, new languages like Pascal, Fortran, and some really strange language known as simply "C" arrived for MS DOS, and even for Apple DOS. I personally latched onto Pascal simply because in the late 1980s when I was at the University of Vermont working on my EE degree, that was the language du jour. Our microprocessor lab consisted of an Intel 8088 proto board for machine language practice. One of our first Pascal programming exercises was to create a routine that would convert a base-10 number to a Roman numeral (not as straight-forward as you might think once you get above 48). There was no such thing as an Integrated Development Environment (IDE) or visual development tools. Performing a divide-by-zero operation caused the entire computer to hang (however, rebooting took about 30 seconds due to the small OS size, with no anti virus software to load, maybe a printer drive, etc.). I was immediately smitten by the programming bug (no pun intended) and set about to write routines for every application I could - or might - use in my daily engineering chores.
Eventually, spreadsheet files with calculation functions began getting posted on bulletin boards along with the applets, but many people did not have access to spreadsheets because they were part of rather expensive office packages. A lot... (more)
RF Cafe has become the the de facto place to visit for questions, answers, and sharing of interview experiences with Qualcomm. Check out the Qualcomm Employment Forum. We have no affiliation of any sort with Qualcomm.
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