Archive for March, 2010

What are the benefits of Laptops?

Friday, March 26th, 2010

A lap top is a portable personal Computer. It is so called as it is small enough to fit into a person’s lap. Laptops have most of the features of a desktop like Keyboard, screen, touch pad and batteries. They are usually shaped like a large notebook.

They were initially intended for a niche market like military and internal revenue services. But now they are popular with the general public like students etc. In 2008, sales of laptops exceeded those of Desktops in the USA.

The advantages of Laptops are many:

Main advantage is portability. It means that the Laptops can be used anywhere, at home, in the office, while traveling, in lecture halls, coffee shops etc. Portability offers the following advantages:

  • Achieving more: More work can be completed by Laptops. It can do work where it is not feasible by a desk top, like while traveling, or while resting in a university coffee shop in between lectures.
  • Instantaneous work: Carrying a laptop computer provides immediate access to various personal files and other information. Getting immediate access to information helps in better collaboration between students and coworkers because a laptop can be used to present a solution anywhere at any time.
  • Latest information: In case a person has more than one desk top PC, it becomes a problem to synchronize; changes in one are not automatically transferred to another. It needs to be physically transmitted like through a USB stick. But using a single lap top at both locations solves the problem as files are found in one location and are up to date.
  • Connectivity: the latest broadband and WiFi connections enable the Laptops to be net connected wherever it is transported and enables internet based work at any place, at any time.

The next advantage of Laptops is their size.

· Laptops are much smaller than Desk tops. This is useful when there is a shortage of space like student dorms and small apartments. Lap tops can be folded and put away.

· They are easily accessible. Many of the drives, hard drive, memory etc on the Laptop are easily accessible in comparison to the desktop.

· Also, power consumption by laptops is much lower than that of desktops. A laptop uses 60-90 watts while a desk top consumes 100 to 800 watts. For more details please visit http://www.webelectronicsstore.com/computers/

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How to Select An Automotive GPS

Thursday, March 25th, 2010

Getting from one corner of a city to another is not usually an easy task with large amount of distraction and traffic to interfere in your attention.

Before GPS or Global Positioning System was invented, to travel to unknown areas required a map or stopping at different points to ask for directions. Both methods are fraught with problems. Reading a map while driving is not an easy task and you require the assistance of some one else to read out the directions.

Asking for directions can be frustrating with different people giving different advice on the way or if one person gives unclear instructions.

Fortunately the automotive GPS has been invented and it has made map reading and asking for directions much simpler. Gaining directions has been easier as it can be done through activated voice, pushing buttons, touching the screen or combining a number of these functions.

Maps giving the exact location appear on the screen while a computer generated voice can give directions. The only problem is to decide which GPS unit to buy.

The first consideration while buying a GPS unit is to consider its accuracy. One way to determine how accurate a GPS unit is by considering how many channels the GPS unit has. This is because more channels means that there are more satellites that it communicates with it and resulting in more coverage.

One other way to determine accuracy is by determining how its antenna is designed. Ensure that antenna is placed in a spot on the unit where it can freely stand.

The next consideration with respect to GPS is its size. Some GPS units are not portable. Some others are small enough to be portable. There are some as small as a hard cover book.

The third consideration of a GPS unit is the interface of the unit. Expensive versions of GPS units will consist of voice activation and also touch screens while cheaper ones are enabled through a set of buttons. Use of buttons is convenient only if there is another person in the car. But if only the driver ahs to operate the unit, it must be as Hands-free as possible. It is also vital to get an Automotive GPS unit that can give directions through a computer generated voice. For more details visit http://www.webelectronicsstore.com/gps/

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Liquid Crystal Display or LCD TV is the latest technology in the market

Tuesday, March 16th, 2010

Whether placed along a flattened screen or in a projector’s centre, the technology behind all LCD’s is the same. A system of Thin Film Transistors (TFT’s) supply voltage to cells filled with liquid crystal placed between two glass sheets.

When subject to electric current the crystals untwist to a perfect degree to filter white light emitted by a lamp placed behind the screen, in the case of Flat panel TV’s or trough a small LCD chip projection , in the case of Projection T.V.

LCD monitors produce color through a subtraction process. They block away color wavelengths of particular color for white light spectrum until they are left with the correct color. The light’s intensity allowed to transmit via this liquid crystal matrix enables LCD TVs to display a wide variety of colors.

LED TV’s are a new type of LCD’s. The LED’s panel is still that of an LCD and operates with the same crystal technology. The difference is the backlight changing from fluorescent to that based on LED (light emitting diode).

Regarding color performance, LCD TV’s reproduce colors by manipulating light waves and subtracting colors from white light. This is basically a difficult way to maintain accuracy and vibrancy of color. LCD’s however produce a brighter picture. It will suit a room with lots of ambient light.

LCD TV makers have done a great deal to improve the viewing angles of their displays. The best LCD TV’s have around 120 degree viewing angles.

But LCD TV’s suffer from trailer effects when individual pixels are slightly out of sync with image on screen. During fast moving scenes a discerning eye can detect this motion lag. This applies to both fluorescent backlit LCD’s and LED backed LCD’s.

LCD TV’s are also preferred on aero planes. They are not affected by increase or decrease in air pressure. They perform consistently regardless of the altitude they are operated in.

Regarding longevity, there is little to wear out in an LCD TV except for backlighting. But the fluorescent backlighting in LCD’s cannot be replaced cost effectively. LED backlit LCD’s last for a long time.

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