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Blue White
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If you know much about LED lights then you know that they are typically built upon an n-type substrate. On the surface of the device, the electrode is attached to the p-type layer. Often, commercial LED lights also include some kind of substrate of sapphire. A scientist in LED research must always remember that when the refractive index of materials is not properly paired with the index of the semiconductor there is a chance of increased heat and, of course, potential danger. This is actually the exact opposite of one of the major benefits of LED lighting, that being that they do not retain or give off heat despite the generation of light. However, any potential dangers can be remedied simply by assuring that the basic scientific functions are executed properly in the design of each LED unit.
There have been many developments, experiments, and research done on the production and benefits of LED lighting. The semiconductor - device sends charges of incoherent narrow - spectrum light. LED lighting therefore emits a particular form of electroluminescence that can, theoretically, be easily utilized an alternative light source. The semiconducting chip of an LED light is of course, cased in solid plastic in the form of a lens - a very effective and very strong. Making LED lighting one of the safest kinds of bulb - lighting.
The development of LED began with the introduction of lighting devices and with gallium arsenide - particularly for infrared and red lighting purposes. Of course, LED lighting had a great beginning, already useful for things such as Christmas trees and theatrical lighting (being that they can be used in several colors.) However, the research and development of LED lighting has since grown and will continue to grow.
More advanced and especially more complex LED's are those being created in ultraviolet, blue and even white shades. For example: an ultraviolet GaN LED,Blue type of LED uses a wide band gap semiconductor in GaN as well as InGaN (indium gallium nitrate). The concept was there, however, it was not until 1993 that high brightness of blue LED lighting was possible thanks to the work of a man named Shuji Nakamura from the Nicha Corporation.
White LED lights can be created in more than one way. For example: As I mentioned, most LED white lights are based on InGaN and GaN structural designs. These lights are said to be capable of emitting bluish light wavelengths between 450 nm and 470 nm blue from the GaN.
The GaN/InGaN lights usually use a yellowish colored phosphor coating of cerium - doped yttrium aluminum garnet (Ce3+:YAG). The Ce3+YAG crystals are considered a scintillator as opposed to a phosphor. Because yellow light acts to stimulate the red and green light receptors of someone's eye, the appearance of white actually comes from the presence of the mix of the yellow and blue. The white light resulting from this is a shade of white often referred to as "lunar white" by people in and outside of the industry.
The overall spectrum of a white LED light will distinctly show that it comes directly from a GaN-based LED and can peak at about 465 nanometers. When more broad - strokes of shifted light emitted by the elements of Ce3+YAG phosphor the light emitted can be extended to between 500 and 700 nanometers. In manufacturing, the LED's must be properly sorted during the process by their own particular characteristics because of the spectral characteristics of the diode.
White LED's can be made in other ways as well, for example: one can coat near ultraviolet rays (NUV) that emit LED's with a mix of highly efficient europium - based reds and blues, these phosphors added to green emitted by copper and aluminum doped zinc sulfide, or ZnS:Cu, Al. However, this method is less efficient than LED with YAG:Ce phosphor, primarily because it is larger and more energy is transformed into heat than with other LED's.
A man named Micheal Bowers, as a graduate student in Nashville, TN at Vanderbilt University recently developed a kind of LED lighting that involves coating a blue LED with quantum dots. The quantum dots, in response to the LED light, will glow white. The effect is quite similar to incandescent bulbs - meaning that the technique produces a warm, glowing, yellowish light.
Before Bowers made his discovery, another of the most recent method of producing white - light LED's is a method which makes use of absolutely no phosphors whatsoever. Some call the idea revolutionary - it is certainly a great idea in the development of LED's today. The newest method is based on a homoepitaxially developed form of zinc selenide (ZnSe). Basically, the ZnSe substrate for this purpose is a creation which emits blue light simultaneously from the active region as well as the yellow from the substrate.
Anne Clarke writes numerous articles for websites on gardening, parenting, fashion, and home decor. Her background includes teaching, gardening, and fashion. For more of her articles on LED lighting and other environmental lighting alternatives, please visit solarhome.org, supplier of Solar Lighting and Solar Panels.
Power Macintosh G3 (Blue & White)
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Power Macintosh G3(Blue & White)
The Blue & White Power Macintosh G3.
Developer
Apple Computer Inc.
Type
Desktop (Minitower)
Release date
January, 1999
Discontinued
August, 1999
CPU
PowerPC G3,300 450MHz
An open Power Macintosh G3 case, showing the logic board placement on the hinged door.
The Power Macintosh G3 series (commonly known as the "Blue and White G3", or sometimes just the "B&W G3" to distinguish it from the original Power Macintosh G3) was a series of personal computers designed, manufactured and sold by Apple Computer Inc. as part of their Power Macintosh line. It was introduced in January 1999, succeeding the original "beige" Power Macintosh G3, with which it shared the name and processor architecture but little else; it was discontinued in favor of the Power Mac G4 line in August 1999.
The Blue & White G3 used a modified version of the memory/PCI controller, the Motorola MPC106 (codenamed "Grackle"); it used the MPC106 v4. The I/O "Heathrow" had been replaced by "Paddington" (adding 100 Mbit Ethernet and power save features), the audio chip "Screamer" (on the beige G3's "Personality Card") had been replaced by "Burgundy", and other controllers for Firewire (Texas Instruments PCI-Lynx), for USB etc. were added.
Note that "Paddington" only handles the slow IDE bus for CD/DVD and ZIP, in fact it provides up to 16.6 MB/s like its predecessor "Heathrow". The fast IDE bus for the hard disks is an extra chip and provides up to 33 MB/s; this one is the problem in the Rev 1 blue/white G3s.
Though still based on the PowerPC G3 architecture, the G3 B&W was a totally new design. The first new Power Mac model after the release of the iMac, it used a novel enclosure with the logic board on the folding "door", which swung down onto the desk for easy access (a design that was also used on all Power Mac G4 models except for the Cube). It also introduced the New World ROM to the Power Macintosh line.
Hardware
The faster models (not the 300 MHz model) used the new copper-based PowerPC G3 CPUs made by IBM, which used about 25% of the power of the Motorola versions clock for clock. The B&W line ranged from 300 to 450MHz. Despite its 100MHz system bus and PC100 SDRAM, the 300MHz B&W G3 performed worse than its 300MHz Beige predecessor, because it had only 512KB L2 cache, half of what the 300MHz Beige had. The logic board had four PCI slots: three 64-bit 33MHz slots, and one 32-bit 66MHz slot dedicated for the graphics card, an ATI Rage 128 with 16MB SGRAM. Four 100MHz RAM slots accepted PC100 SDRAM modules, allowing the installation of up to 1GB of RAM with the use of 256MB DIMMs. The onboard ATA was upgraded to Ultra ATA/33 (in fact an extra UDMA-33 controller was added, see above), but SCSI was no longer present, having been replaced by two FireWire ports, a new standard (IEEE1394) running at 400Mbit/s (50MB/s) faster in theory than even the ATA/33 (33MB/s) hard drive controller. The serial ports were gone, too, having given way to two USB 1.1 ports (12Mbit/s), as implemented already in the iMac. The ADB port remained, as did the option for an internal modem. Also gone was the internal floppy disk drive. 100BASE-TX Ethernet was now standard, and audio was moved back to the logic board. A Zip Drive remained an option, and some configurations included a DVD-ROM drive and a DVD-Video decoder daughtercard for the graphics card, allowing hardware-assisted DVD video playback.
The blue-and-white Power Macintosh G3 was the first Power Mac with the "New World" architecture which only contained a small (approximately 1MB) boot ROM. When booting the Mac OS the Mac OS Toolbox and any other ROM patches installed would be loaded into ram (the former Beige G3 however was the first Mac with this ROM-in-RAM capability). Initially, many buyers chose to buy the older "Platinum" G3s instead, in order to maintain compatibility with existing peripherals.
The blue and white G3's case design was widely praised at the time for being easy to open up and work on. It had a door on the side that hinged down by pulling a latch at the top. No components needed to be removed or unplugged to open the case, and in fact it could be done with the computer running. The logic board was positioned in the door, providing easy access to all components. The hard drive(s) were mounted in a bracket affixed with one screw on the floor of the case. There was room for four internal hard drives. Removable drives were in a more conventional position at the top of the case.
The inside of the Power Mac G3
Early blue and white G3s ("Revision 1" units) had IDE controller problems related to the ATA/33 hard drive controller that made it impossible to connect two hard drives and prevented the use of newer drives. Using newer ATA drives in those units resulted in data transmission...(and so on) To get More information , you can visit some products about , . The Emergency Wind-up Flashlight(SB-3049),LED Flashlight,LED torch products should be show more here!
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what is the best course to add your construction and building skill after white/blue course?
hi there,i am planning to chose building and construction field as a job, and for my future i want to improve my skill as much as i can i have my blue/white card...what is the best course to take next?
thanks
Carpentry, formwork/concreting, metalwork (something that will teach you how to use tools and preferrably an actual trade. Doing labouring work on a construction site would help you choose a trade. Check out trades and apprenticeships. australianapprenticeships.gov.au or contact you local TAFE college for courses. My husband started out labouring, specialising in formwork and is now a Construction Manager so there are great career opportunities out there if you continue to work hard and study. Best of luck.
White Bear Lake police on lookout for man who posed as cop
White Bear Lake police are looking for a man who allegedly robbed a motorist Thursday while posing as a law enforcement officer.
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