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used computerNationwideNationwide is affecting the whole of a nation. Worldwide is spanning the world.Juniper NetworksJuniper Networks, Inc. is an information technology company based in Sunnyvale, California and founded in 1996. Juniper Networks designs and sells Internet Protocol network products and services. Juniper also partners with Ericsson, Lucent, and Siemens AG to provide IP/MPLS network solutions to customers. Juniper's products include T-series, M-series, E-series, and J-series families of routers, and the SDX Service Deployment System.laptop computerA laptop computer, or simply laptop is a small mobile computer, which usually weighs 2-18 pounds (around 1 to 8 kilograms), depending on size, materials, and other factors. Laptops usually run on a single main battery or from an external AC/DC adapter which can charge the battery while also supplying power to the computer itself. Many computers also have a 3 volt cell to run the clock and other processes in the event of a power failure. As Personal computers, laptops are capable of the same tasks as a desktop computer, although they are typically less powerful for the same price. They contain components that are similar to their desktop counterparts and perform the same functions, but are miniaturized and optimized for mobile use and efficient power consumption. Laptops usually have liquid crystal displays and most of them use different memory modules for their random access memory (RAM), for instance, SO-DIMM in lieu of the larger DIMMs. In addition to a built-in keyboard, they may utilize a touchpad (also known as a trackpad) or a pointing stick for input, though an external keyboard or mouse can usually be attached. A laptop is a notebook computer. Notebook and notepad are laptops.used goodsA second-hand or used good is one that is being purchased by or otherwise transferred to a second or later end user. A used good can also simply mean it is no longer in the same condition as it was when it was first transferred to the current end user. With respect to a quantifiable resources, such as the charge in a battery, it also refers to something which has been partially or completely depleted. The strategy of buying used items is employed by some to save money, as they are typically worth less than the equivalent new items. Purchasing used items for reuse prevents them from becoming waste and saves costly production of equivalent new goods. Motivations for purchase include conserving natural resources and protecting the environment, and may form part of a simple living plan. used goods Wiki used goods |
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desktop computersA desktop computer is an electronic machine computer that converts raw data into meaningful information, made for use on a desk in an office or home and is distinguished from portable computers such as laptops or PDAs. Desktop computers are also known as microcomputers. There are four types of desktop computers: home computers, or personal computers; workstations, Internet servers, and special communications computers. Desktops are currently the most affordable computers and ubiquitous in businesses, schools, and households; they are used for performing office tasks, organizing digital photos, video editing, and Internet access. Nearly all desktop computers are modular, with components that can easily be replaced or upgraded. Desktop computers come in a variety of case styles ranging from large vertical towers to small form factor models that can be tucked behind an LCD monitor. desktop computers Hardware An exploded view of a modern desktop computer: Display Motherboard CPU (Microprocessor) Primary storage (RAM) Expansion cards Power supply Optical disc drive (ODD) Secondary storage (HDD) Keyboard Mouse The hardware in a desktop computer is modular, making it easy for someone with intermediate knowledge of a computer to modify one. Desktop computers are generally more affordable than notebook computers. This is because no extra effort is needed to miniaturize the components, nor to find design solutions to the thermal management problems that arise from the use of components that emit heat in a compact space. [edit] Components Fan - cools the computer. These are present on most computers. There are often multiple, one to cool the processor(see below), one in the power supply, and possibly additional ones for the graphics card and general cooling. Motherboard (a.k.a. mainboard) - links all of the components together and routes data. HDD (hard disk drive) - location where all information can be stored even when power is off. ODD (optical disc drive) - reads most or all types of CDs and/or DVDs. Processor - The main brain of the computer. CPU Cooler - cools the processing unit. Typically a fan combined with a heatsink. RAM - short-term data storage, volatile (data is erased when the computer is powered off) Graphics card - codes video output and delivers to monitor. Physics card - performs physics computations in some modern games. Sound card - codes sound output and delivers to speakers. Speakers - deliver sound. Modem - used to access data via a telephone line (dial-up connection). Used to access BBS and the Internet. Network card - allows the computer to be linked to a computer network where it can communicate with other computers. Also used as a means of accessing the Internet via a broadband connection. Computer PSU (power supply unit) - A device that provides power to the rest of the computer parts. FDD (floppy disk drive) - Reads and Writes floppy disks. Although largely supplanted by CDs and Flash Drives, is still common on many systems, and may be required during set-up on certain operating systems. |
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