Ultrasonic Transducers

The sound frequency used in these is usually in the range of one hundred kilohertz to fifty megahertz that is way above the normal human hearing range of twenty thousand hertz. Sound generated at these frequencies has a shorter wavelength that can reflect small surfaces and enable it to detect the defects inside solid materials such as metal and plastic.

These devices use Piezo or ferroelectric material as an active element to detect flaws by converting the excitation pulse (electrical energy) generated from the flaw detector into ultrasonic energy. The transducer’s performance is enhanced with the use of materials such as Piezo polymers and composites that are capable of producing different wave modes, by cutting the ceramics in different forms. These devices contain a backing component made from high density material to absorb the energy radiated from the active element’s back face, and control the vibration of the transducer. They … Read the rest

USB Flash Drive

Essentially the same, USB flash drives are available in a variety of styles and colors and even with various uses but all work the same. Marketed flash drives come in a range of sizes from 8 megabytes to, just recently, 256 megabytes – enough to hold digital pictures, a couple of hours worth of MP3s, or hundreds of documents. All of this comes at affordable prices, especially when looking at the generic USB flash drive brands.

Aside from its initial use, more and more manufacturers have made USB flash drives even more usable and can now be used as MP3 players, voice recorders or even FM tuners. There are even USB flash drives that function as wristwatches and others that may be used as pens.

USB flash drives reviews consider what most people take note of when purchasing their USB flash drives – capacity and function, speed, price, design, extra … Read the rest

Solve Shut Down And Related Problems

Clients should be educated so they understand that if a computer is not shutting down properly, the underlying problem can lead to serious consequences.

The issue should be resolved, rather than just shutting off the computer and denying it power. Many times a system hangs during shutdown due to an application that is not properly releasing control or a runway process. These two problems can we solved with the help of selective startup and windows 2000 Task Manager.

At first, it may seen strange to use startup options to resolve a shutdown issue, but by selectively choosing which options are installed on your system during operation, one can isolate the problem. Windows 2000 offers task manager, a utility that is not available in windows 9x. Press Ctrl+Alt+Del while system is running, to access this utility. This utility lets you quickly see that how the system is using CPU and which … Read the rest

Spectrum Analyzers

Generally, a spectrum analyzer is a device that measures and analyzes signals throughout the electromagnetic spectrum. The analyzer divides into parts signal and splits them into an amplitude component and a frequency component. You can find a variety of spectrum analyzers in the market. You have the subaudio, audio, and radio-frequency analyzers. You can also find spectrum analyzers that are intended to measure microwave and optical signals.

Aside from the kind of signals it measures, a spectrum analyzer can also be divided into analog, digital or hybrid. Digital spectrum analyzers usually handle more complex analysis and are used mainly with Fast Fourier Transform or FFT. Digital analyzers are able to transform the electrical or optical signals into components that are much smaller and a lot simpler. The differences of each model can be traced on the bandwidth range, sweep rates, frequency, and resolution.

Even before you buy a spectrum analyzer … Read the rest

Avoid Computer Eye Strain

Kinds of computer monitor

CRT or Cathode Ray Tube computer monitors are the most common. They are compatible with Macintosh and PC systems. Although bigger than other monitor types available, CRT monitors are still ideal for home and office use. They are also cheaper.

More expensive flat screen monitors have higher resolution, while LCD computer monitors have wider color ranges and high-contrast displays. For generating faster pixels, TFT computer monitors are available. Most of these computer monitors have built in speakers, mobile bases and security locks.

Your eyes and your monitor

Are you suffering from eyestrain from working long hours in front of a computer? Do not worry. This condition can easily be averted by adjusting your monitor as well as your usual work methods.

You can reduce eyestrain simply by adjusting the font quality and refresh rate of your computer. Make sure that your computer screen is slightly below … Read the rest

Portable Handheld Lasers

First, what exactly are you looking to accomplish with your portable handheld laser pointer? Does the beam need to output over any set distance? What color frequency are you looking for and how much output power does your application require? These are all simple questions that you may want to answer before you start looking to shop for a portable pointer. Lasers are high-tech gadgets that can come with a hefty price tag, be sure that you are ready to do a little bit of research into any hand held module before you order one from a retailer. All portable lasers are not created equal! A little bit of knowledge about any particular handheld unit can not hurt your situation, in fact the more you know about the diode, casing, expected life time, etc., the better off we will be when we are looking to buy lasers.

There is a … Read the rest

Electronic Waste Recycling Methods

Sale

Online auctions offer an alternative for businesses and consumers looking for an opportunity to resell their used electronic. Online classified ads offer an ideal platform that links sellers to buyers.

As a result, businesses looking for a cost-effective technique of recycling large amounts of electronics opt to sell most of their e-waste. They have the option of selling their electronics to online auctions in exchange for a small fee.

Donation

Businesses and each consumer have the option of donating their electronics to charity. There are several charitable organizations that receive used and old electronics to give them to the needy, such as schools in the developing nations.

Take back

Some of the major computer manufacturers provide take back options. Therefore, before purchasing a product it is important to find out from theĀ if they provide recycling services.

Once your electronic has outlived its useful life, you can make arrangements … Read the rest

Toner Cartridges

The actual particle size of toner comes about 12 micrometers. When image resolution was enhanced to 600 dots per inch, any how, the particle dimension was condensed to 8 micrometers. Further reductions in size would be essential for developments in resolution. Toner cartridges manufacturers preserve an excellence control standard for actual particle size in order to create a powder appropriate for use in their printers; the actual particle size in the product is not really allowed to vary too much from the essential dimension.

Toner has usually been made by compounding the ingredients and making a slab that was broken or palletized and then turned it into a fine dry toner powder with a controlled actual particle size variety by air jet milling. This procedure resulted in toner cartridge a granule that, if looked via microscope, displayed different sizes and jagged shapes. To get a best print, some ink/toner companies … Read the rest

Ultrasonic Welding

The ultrasonic welding process offers many advantages over other welding techniques and is most commonly used in manufacturing wire harnesses, electronic components, and appliances. Ultrasonic welding is used when multiple layers of foil need to be welded onto a terminal or welded together with different combination of metals such as copper, aluminum, lithium, and nickel.

Ultrasonic welding uses a “low power friction” welding process in which little heat is generated and better control can be applied. The basic idea is to scrub work pieces across each other while clamped under pressure to create a bond. Work pieces are placed on an anvil that is knurled with fine ridges that bite into the material, holding it in place during the weld process. The ultrasonic tool is then lowered onto the pieces, clamping them under pressure and creating the needed scrubbing action. This tool vibrates at a frequency of twenty kilohertz for … Read the rest

Hidden Hindrance to Virtualization Performance

More specifically, it is the creation of one or more virtual instances of a “guest” operating system on top of a “host” operating system, or in some cases directly on top of a specialized software layer. It allows numerous virtual machines, either standard PCs or servers, to operate and appear as independent machines when in fact they’re operating off of a single hardware platform.

Many software providers from large to small are in the race to offer virtualization solutions, and many enterprises are taking advantage. While this futuristic technology certainly offers many benefits, it has one critical challenge to its overall performance–disk file fragmentation.

File fragmentation–the splitting of files into pieces (fragments) in order to better utilize disk space–is a performance challenge in non-virtual environments, and has been for many years. But virtualization brings with it even more critical fragmentation issues, requiring solutions like never before.

The key to understanding … Read the rest