Plumber Merchants: a Guide to Buying Online December 28, 2011
Posted in : Home Improvement Management, Nothing But Hardware , comments closedWe live in unusual times – it appears numerous college students are flocking to studying “softer” degree like art history and similar, and yet the financial system is calling for graduates who have the talents in much more fundamental professions. Given the condition the economy is in, and the price of tuition charges, it is astounding that people aren’t concentrating on the more elementary occupations that have high demand and are well paid. Let’s take a look at plumbing for example. It’s a rather well paid vocation, and it’s one in which you can do the job by your self making sure your costs are as low as possible. You possibly can even bill your clients the price of parts too – thus in essence, you have a tiny amount of operating expenses. My pal is a pipe fitter, and he purchases his parts via plumber merchants on-line – rather fast and simple to execute. He has his personal van, does the the amount of hours he desires to, and makes a very good living from his line of work – what’s better than that? He has thought about expanding his business to incorporate folks working underneath him, but he’s sagely determined to carry on working on his own. I think he has the perfect line of work that’s enjoyable, and comparatively free of stress.
A Fundamental Guide To Selecting The Most Suitable Digital Photo Frames December 29, 2009
Posted in : Nothing But Hardware , comments closedDigital photo displays are the electric brother of the classic photograph-album. These electrical pieces of equipment make very good presents and are also terrific when it comes to giving to your close friends and relatives, therefore get a move on and get aboard the digital photo frame fad.
Why choose a digital photo frame: If you are similar to me you most likely capture tons of photos of the family and the children. The original style photographers did things was getting picture album after picture album. Yet, with the development of compact digital cameras, taking those holiday snaps immediately became dramatically more cost effective meaning a lot more photos are being captured today than ever. A digital photo frame permits you to show 100s or even thousands of photos inside one gadget that looks more or less the same in appearance as an original photo frame. Find a substantial number of technology products such as; digital photo frames, LCD televisions and Panasonic televisions from leading brands online.
What dimensions are available when it comes to digital photo displays: Currently you are able to purchase frames from five inches through to thirteen inches in size. Digital photo frames come in an assortment of looks in order to suit any flat and any need. Digital picture frames are transportable and can easily be moved to anywhere you might require them. Capturing photos of the children and your grandparents has never been easier.
Which qualities must you look out for on a digital photo frame: Basic options that you will need for your digital picture frame are a significant quantity of internal memory as well as the ability to add extra memory capable of interfacing with large-capacity memory cards. Normal picture frames are capable of using SD, SDHC, MMC, MS, XD, CF memory cards in addition to a USB connection for use with the items internal memory and installed memory card. You are also advised to look for a durable battery and rapid charging unit. A variety of the newer digital photo frames contain the option to play video and include built in speakers. The resolutions of the screens are ever-increasing and with every development of digital picture frames you should look for the greatest resolution available to you so that your images continually look their best.
Which picture frame ought I procure: Which brand and what size picture frame you eventually choose depends completely on what you wish to use it for. If you require a compact frame to take in your handbag you could think about obtaining one of the small sized frames because they normally are smaller and more straightforward to carry. On the other hand, if you are trying to find a showpiece frame to sit on your mantle piece then you are without a doubt going to be looking for the biggest digital photo frame that will fit on your mantle. Regardless of what the interior decoration you have in your household, you can buy a picture frame that blends in without any problem.
What price should I presume to pay for a digital frame: Worth by and large varies according to frame size therefore you will find prices varying from thirty pounds to £300. As with any technology products you get what you pay for so skimping on price now possibly will result in regrets down the line.
Windshield Replacement November 2, 2009
Posted in : Nothing But Hardware, Road Rage , comments closedReplacing or repairing a broken windscreen can be one of the simplest, or one of the most frustrating, experiences that you can have as a car owner depending on the approach that you take. Windscreen replacement is not for the faint of heart; it involves strength, a pair of steady hands, and a willingness to follow instructions carefully.
All vehicles are unique, most of the time, removing a windshield involves loosening the urethane that supports it in position, then raising it out its place with caution. Once this step is done, using the a utility knife the left over urethane must be cleared away to make room for the new windscreen. The new windscreen is then glued into place, and secured with bolts. When replacing a windscreen, it is extremely important to make sure that the new urethane seal is put in place the right way, because any outflows can cause wind to get into the car, totally ruining the experience of driving.
If a windscreen has a chip, it may be possible to repair it as oppose to replacing it. windscreen repair is an easy process. Repair kits can be found in almost every auto parts store, and involves sealing off the chip with resin. The resin the clear and does not leave a mark, and once the procedure is complete, it is nearly impossible to tell that the windshield was ever chipped. Windscreen repair kits can be unreliable when used to fix large cracks, however, and can sometimes make the problem worse, demanding a replacement. This job is often better left to professionals.
If you decide to let a professional deal with your windscreen problems, you may be delighted to find that this is one of the few auto repair jobs that does not require your car to be brought to a garage. Many repair companies offer mobile services, which can be completed in a matter of an hour or less, even if the windshield needs to be replaced completely. Mobile windscreen repair services are able to perform the service at your home, or while you are at work, making the process an extremely convenient one.
LED lighting modules: taking the heat out of the situation
Posted in : Nothing But Hardware , comments closedThe appeal of using LEDs in lighting applications is growing rapidly. The numerous and significant benefits of using modules that incorporate a matrix of LEDs are being recognized by design engineers in several key industry sectors, including aerospace, architectural lighting, and the “golden egg” automotive market.
Attributes such as design flexibility, low power consumption, even and reliable light, and long lifetime distinguish LED modules from designs based on traditional filament lamps and fluorescent tubes. LEDs can also have knock-on benefits, such as greatly reducing the size and complexity of the module and simplifying the lens design.
A good example of some other benefits of LED lighting is demonstrated by an application in the cabin of a passenger aircraft. A retrofit LED unit that replaced a fluorescent-tube lighting module enabled finely controlled dimming and also provided mood lighting through the use of differently coloured LEDs.
Thermal management
Perhaps the most challenging issue when realizing a module design that uses LEDs is to manage the temperature of individual device junctions during normal operation. If the considerable amount of heat produced by all the devices in a module is not managed correctly then the junction temperatures may reach a level where the LEDs’ expected life is shortened and reliability is compromised (see Links).
LED modules typically comprise a matrix of many surface mount devices. These LEDs are soldered to an etched copper layer that provides the interconnects between the individual LEDs as well as other passive and active components that are required to complete the circuit. The small size of the LEDs and the close proximity with which they can be mounted means that designers have a huge amount of design freedom and can achieve complex lighting patterns with high levels of brightness.
The etched copper circuit is separated from a base plate – usually made of aluminum – by a thermally efficient, electrically isolating dielectric material. The characteristics and capabilities of the dielectric layer are key to the design flexibility and performance of the overall module.
Dielectric materials are made by blending thermally efficient materials such as alumina and boron nitride with other ingredients, to provide a flexible yet resilient coating on the base plate. An important characteristic of the dielectric layer is the amount of electrical isolation it provides between the copper on the topside and the metallic base plate on the underside. This is known as its dielectric strength. A typical dielectric material may possess a dielectric strength of around 800 V/mil and be coated onto the base plate to a thickness of 8-12 mils (1 mil = 1 inch-3 = 25.4 m).
Dielectric materials used on insulated metal circuit boards usually have a thermal conductivity figure in the region of 3W/mK. This is approximately 10 times the performance achieved by FR4 (flame retardant woven glass reinforced epoxy resin) PCB material.
A further key requirement of the dielectric layer is to be able to compensate for the different coefficients of thermal expansion of the copper track on the topside of the assembly and the aluminum base plate/heat spreader on the bottom side.
Going three-dimensional
Flat sheets of insulated metal circuit board comprising copper foil, a dielectric layer and an aluminum base plate have been available for several years. In the eyes of the forward-thinking LED module designer, the main problem has been that flat sheets of insulated metal circuit board limit them to 2D shapes.
To address these limitations, new dielectric materials are becoming available that have a low modulus, meaning that they are compliant with mechanical stress and strain. These materials not only accommodate the coefficient of expansion of the metal elements of the construction, but also enable parts to be formed into right angles, and even through 360˚. This enables designers to realize complex-shaped designs and ones that form a complete circle with either internal or external copper traces.
When designing with new, formable insulated metal circuit board materials it is possible to route the tracks around corners, which alleviates the need to use connectors and hard wiring. There are several benefits to this, including enhanced reliability resulting from having fewer junctions and interconnects. Despite the slightly higher cost of the new materials, the overall cost is reduced because fewer components are needed, and assembly time is reduced.
Strength and durability
LEDs themselves are inherently durable. Mounting them on metal based circuit boards only serves to enhance their robustness and that of the finished module, providing excellent resistance to vibration and mechanical shock.
Automotive lighting clusters provide a good example of how LED modules can provide superior performance compared with traditional filament lamps. On-vehicle applications experience high levels of vibration and wide operating temperature ranges that can cause premature failure of filament lamps. In some operating conditions LEDs can last up to 100,000 hours, which means that they should not require any attention for the life of the vehicle.
The long life of LEDs also simplifies the designers’ task because it is less important to make the lighting module accessible for servicing in the finished product. This can result in a neater, more integrated installation and also in potential cost savings.
Temperature modelling
Thermal analysis software packages are available to help prove LED based module designs before they are committed to manufacture.
These software packages gather data from an integrated database about LED performance and specifications along with those of other devices that are mounted on the insulated metal circuit board. This data is combined with other information about elements of the design, including the copper traces, power and ground planes, and vias. The collated information is then processed to produce an accurate representation of the thermal performance of the design.
User-friendly graphical representations of the results enable the design engineer to quickly pinpoint areas that may require attention, right down to component and track level.
Thermal analysis software can bring significant commercial and design benefits by helping speed the time to market and reducing the number of iterations needed to reach a production-ready solution.
James Stratford is the managing director of Universal Science (www.universal-science.com), a UK-based company that designs and manufactures a range of thermal materials.
Tel: +44 (0)1908 222211, e-mail: sales@universal-science.com.