February 2011
« Jan   Mar »
Recent Posts

Архивы за February, 2011

Hp pavlion dtu ac adapter w

HP Pavlion DT859U AC Adapter 120W


120W HP Pavlion DT859U  AC Adapter

Input: AC100-240V (worldwide use)

Output: DC19V 6.3A

Power: 120W

Outlet: 2-prong

Connecter size:
Internal Diameter: 2.5mm
External Diameter: 5.5mm

Brand New Replacement Product, works as genuine parts, 100% OEM Compatible!!

Full 12 months warranty!

Remark: US style Power cord included!

Why buy wholesale goods from us?

* Professional wholesale AboutBuys.com
AboutBuys is leading Business to Customer platform where buyers can buy direct from China on line. Our company was originally founded in ShenZhen of China, we are Chinese factory representation and wholesale of high quality and low price consumer electronic products,which provides you with an extensive selection of what you need.To make a pleased online shopping atmosphere for our customers is what we are striving for. Therefore, we will exert our efforts to provide the qualified electronic products for you at very low price; to deliver the goods to you in the fastest speed as well as improve our services constantly.

* Its so easy to place a wholesales order
You can order goods directly through our wholesale website without having to register. Use the most advanced fast and secure payment systems such as PayPal. You can also pay for your goods by wire transfer.

* Fast delivery for wholesale from China
We use DHL, EMS, UPS and HK Post ect… From China to major destinations like US, Europe and Australia it only takes 2 to 6 days.

* Security
Security is at top priority at AboutBuys.com. We ensure the integrity and encryption of the data of every transaction by applying the most advanced security solution provider VeriSign.

The world of scanners is incomplete without hp

The World of Scanners is Incomplete Without Hp!

In the modern day world of cut-throat competition, no business can afford to lose any opportunity to stay in the race for the top position. For this, it needs to be advanced and far ahead of its peers. But a business’s performance may be hampered by the time-consuming management of paper documents or files. This may also lead to a slow and poor performance, which a business can simply not afford. However, an efficient business bolstered by the presence of smart thinking minds will always be on a hunt to enhance all the productivity levels even if the enhancements are on a small-scale in the initial years. These small scale enhancements will obviously see an uprising in the future years and this is where the purpose of such plans is achieved.

Some of the eminent names in the world of scanning devices such as Hewlett Packard (HP) and Canon have been able to receive positive responses from all parts of the world. HP is undoubtedly the market leader when it comes to the advanced scanning solutions and users from all parts of the globe simply swear by its brand name and consistent performance. The HP Scanjet G3010, HP L1950A photo scanner, HP Scanjet 2400 Digital Flatbed Scanner and HP Scanjet 8300 are some of the most highly acclaimed scanners from the reputed house of Hewlett Packard. These HP scanners will never fail to deliver high-end scanning performance even after a rigorous usage of the scanning devices. They are also reasonable in terms of their prices and are suitable options for the home users, student community as well as executives and professionals.

While buying a good scanning device, you must perform a thorough market survey to get a cheap scanner deal. This will not only give you access to all the scanning devices in the markets but also will help you to achieve smart scanning solutions, without any fail.

The basics of hardware for your network

The Basics of Hardware for Your Network

Even a basic knowledge of networking is a major asset in today’s world. Even if you don’t want to get into the details of the subject, the ability to connect your computer to other computers, a router or a peripheral will save you a lot of headaches. It is also a good idea to have a basic knowledge of the equipment you need and what it does. In this article we look at the basic building blocks of a computer network and explain what the various pieces of hardware do.
Of course, any network will need at computers. If you are very new to the subject a good first lesson would be to attempt to connect two computers either by ethernet cable or wirelessly so that they can share information. If you can do this, you have created your first network.
However, when you add more computers, printers, scanners and other peripherals, as well as an internet connection, things get a lot more complicated. The average home network will have most or all of these components and business networks get infinitely more complex. So, here is a basic overview of the hardware needed to build a network.
Cable or wireless?
The most basic requirement of any network is that the various components are connected to each other. Here, there are two choices. Cable or wireless. Ethernet cable remains the fastest of the two and remains an important building block of most networks, especially large business network where high data transfer speeds are essential.
That said, the next generation of wireless is set to close the gap on ethernet cable in terms of speed, and offer a much greater range. Already, wireless is favored in smaller networks because it spares the expense and the mess of ethernet cables, and is easier and cheaper to maintain.
Although networks can exist without being connected to the internet, it is rare in today’s world. And for a network to connect to the internet a modem is required. Most modern home or small business networks will use a cable/ADSL modem. These usually provide speeds of up to 10 Mbps by ethernet. However, in reality, very few internet service providers can provide a connection that even comes close to this speed. Ethernet modems are the norm these days, although USB modems do exist and dial-up modems are still used, though rarely for networks.
A router is essential for all networks as it provides the connection between the Local Area Network (LAN), which is the home or small business network, and the Wide Area Network (WAN), usually the internet. A lot of home network will use a combined modem, router and switch which will allow the network to connect to the internet and allow any computers and peripherals on the network to communicate with each other. In very large business networks the router (or sometimes a gateway is used) and switch will be individual hardware devices.
Switches and hubs
There is often a lot of confusion about the difference between switches and hubs. Both allow computers and devices within a network to communicate with each other, but there are some significant differences between them. Of the two, switches are by far the better, and more expensive, option. Switches are essential for larger networks because they make the transfer of information much more efficient.
When a switch receives data from a computer or peripheral it can determine which device/s on the network on the network the data is intended for, and will only send it to its intended destination. This will not be noticed on a small home network but can make a big difference on larger networks.
A hub is a simpler device that can connect anywhere between four and 24 devices. The data will pass through the hub but it the hub will not interfere with the data in any way. Therefore, data sent through a hub will be sent to, and can be accessed by, all devices on a network.
Hardware firewall devices are not really necessary for home networks. The firewall software on your individual computers’ operating systems’ firewalls, and the security options provided by your router, should be more than enough to protect your network.
However, for business networks that are storing large amounts of sensitive information a good hardware firewall is essential. All information from outside the network must pass through this before reaching the network’s main switch. If properly configured by a network professional this should provide all the security a business needs. Further software firewall protection within the network is also an option to secure the network further.

Types of mobile display technologies

Types Of Mobile Display Technologies

A handset might seem to be just a device tnat lets you zaiK on a cellular network, but actually, there is a lot you need to know about handsets before you go out and buy one. What do you need? What kind of form factors are available? What about the battery? Then, there’s the camera to be considered. Also, if a mobile phone is to be really mobile, you need to consider connectivity options. Then there are accessories to jazz up your phone -We round off this chapter with descriptions of a few especially desirable phones.
Display Types
Not only do mobile phone displays show caller information, menu options, contacts, etc., mobile phone displays these days need to be capable of displaying thousands of colours so that high-end features such as images and video playback offer the desired user experience. The followingis a brief on the various types of display technologies in use for mobile phones.
LCD displays utilise two sheets of polarising material with a liquid crystal solution between them. Crystals in this suspension are naturally aligned parallel with one another, allowing light to pass through the panel. When electric current is applied, the crystals change orientation and block light instead of allowing it to pass through, turning the crystal region dark.There are two main types of Liquid Crystal Displays: STN and TFT.
Super Twisted Nematic LCDs use the passive matrix screen technology, which has no active or controlling element inside the display cell. Pixels are controlled by energising the appropriate row and column drive lines of the matrix from outside the display, resulting in a slow frame rate. STN screens have limited colour range and viewing angles (~15 degrees max).
With Thin Film Transistor (TFT) LCDs, each pixel is controlled by one to four transistors. Typically one transistor is used for each of the RGB colour channels. Because of this direct control technique, TFT screens are also called Active-Matrix LCDs.TFT technology provides more accurate colour control, allowing it to display more colours and also offer a wider viewing angle range than other types of LCDs.
OLED stands for Organic Light Emitting Diode. OLED is a flat-panel display technology that is now being used in a variety of devices. Apart from mobile phones, you can also find OLED screens on portable audio players, car audio systems, PDAs and digital cameras. The basic property of OLEDs was discovered in 1985, over a decade before the first displays were seen. Ching Tang, a Kodak researcher, noticed that an organic material glows green if you pass an electrical current through it.An OLED is made by placing a series of organic thin films between two conductors. They operate on the attraction between positively and negatively charged particles. When voltage is applied, one layer becomes negatively charged relative to another transparent layer. As energy passes from the negatively charged layer to the other layer, it stimulates organic material between the two, which emits light visible through a layer of glass. There must be blue, red, and green light-producing organic material to produce the different colours. Because screens using OLED technology produce light themselves, they do not require a backlight as compared to LCD screens. This means that OLED displays require less power and also can be made very thin. Without any other source of illumination, OLED screens can display bright images that are viewable from almost any angle.Like LCDs, OLEDs also come in passive-matrix and active-matrix flavours.Passive-matrix OLEDs are made up of a matrix of electrically-conducting rows and columns making pixels. Between the rows and the columns are the organic layers. On the other side is the substrate, the material which gives the electricity. The more cur-rent applied, the brighter the display.In Active-matrix OLEDs, there is a TFT back plate instead of rows and columns. This controls the brightness of each pixel. There are two TFT arrays per pixel: one to start and stop the charging of the capacitor, and one to provide a constant electrical current to the pixel. Active-matrix OLEDs consume much lower power than passive-matrix ones.OLEDs have the following advantages over LCD or plasma displays: New-age displays: OLEDs can bring in new types of displays, like ultra-thin, flexible or transparent displays.
Power efficiency:
Since OLED screens do not require a back-i hey require much less power compared to other types of displays. This makes OLED a far better choice for portable devices.