An SD (Secure Digital) card is a portable storage device that stores data even when it is not powered. SD cards are very small and fit in many portable devices such as cameras, video game consoles, and cell phones. They can also be used with both desktop and laptop computers if the user purchases an SD card adapter. While SDSC (SD Standard Capacity) cards store up to 4 GB, there are also SDHC (SD High Capacity) and SDXC (SD eXtended Capacity) versions that store up to 32 GB and 2 Read More

Acrylonitrile is a highly flammable and toxic chemical that is used in the production of acrylic materials and other plastics. In its pure form, acrylonitrile is a colorless liquid but impurities can give it a yellow appearance. Acrylonitrile is soluble in water and most organic solvents, boils at 77.3 degrees Celsius, and melts at 82 degrees Celsius. Acrylonitrile polymerizes spontaneously when heated, although polymerization inhibitors are often used to prevent this. Acrylonitrile releases hydrogen cyanide and nitrous oxide when burned, and is widely investigated and disapproved of due to its Read More

Internet Explorer (IE) is the Microsoft produced web browser that is freely bundled with the Windows operating system. A common task that arises for users of Internet Explorer is zooming in on web pages that do not have font large enough to view. This capability is included with the web browser to greater enhance the accessibility of web pages to those who have difficulty with vision or just to cope with sites that do not provide an automatic scaling of the text or imagery included on a web page. The Read More

A thyristor is a solid state semiconductor device that consists of four alternating layers of N-type and P-type material. Many sources consider thyristors to be the same as Silicon Controlled Rectifiers (SCRs). In some cases they are defined as a large group of devices – the eligibility criterion being that the device should consist of a minimum of 4 layers of alternating N and P-type material. A thyristor functions as a bistable switch, which means that it starts conducting when its gate receives a pulse of current. It conducts until the Read More

Photonic crystals are those that manipulate how photons are absorbed or reflected off of them. They occur in nature and are made of dielectric nanostructures that allow certain wavelengths to pass through them while blocking other wavelengths. The visible light portion of the electromagnetic spectrum’s wavelengths is responsible for colors, therefore photonic crystals can spontaneously emit exotic colors. How Photonic Crystals Work Photonic crystals are made of nanoscale structures that either allow or block individual wavelengths of light, depending on the frequency of their dielectric constants. Each wavelength of light Read More

A test credit card number is the card number of a fake live credit account provided by a credit card company in order for retailers to verify that their card readers are working properly and that they are compatible with a specific credit card brand. Test credit card numbers are read like real credit card numbers, but no money is actually moved. How Test Credit Card Numbers Work A retailer can enter a test credit card number into his/her credit card reader or cash register in order to verify that Read More

A content management system–otherwise known as a CMS–is a piece of software that runs on a server. As the name suggests, the software is intended to manage content. The overall goal of a CMS it to make it easier for the average Internet user to publish content on the web. Without having to go in and code new pages using HTML, a user could update a website with just a few clicks. A CMS took the focus away from the coding and the design and instead focused it on the Read More

Mobile software refers to software that can be stored and executed on a mobile device such as a cell phone, PDA, smart phone, or similar device. Mobile software can range in its capabilities as some simply change the virtual appearance of the device while others provide important features such as menu layouts and password protection. ScreenLocker, for instance, can lock unauthorized users out of a mobile device while Opera Mini is a mobile browser. This article will go over a number of mobile programs that can greatly enhance the user’s Read More

Most satellite television is encrypted using conditional access systems such as: DigiCipher II VideoCipher II RS Nagravision VideoGuard Irdeto Mediaguard Viaccess Conex To watch these encrypted television channels, you need a box which can decrypt them. This box is sometimes referred to as a satellite television descrambler. Satellite Television Descramblers Most satellite television descamblers are legal boxes which are provided by legitimate resellers. These descramblers require valid subscriptions from the satellite television broadcasters. A few people sell “hacked” satellite television descramblers which are designed to provide satellite television service without Read More

Troubleshooting SMS Site Server Installation Issues When SMS Setup fails to install the SMS site server, you can use the information in the Smssetup.log file to determine where the SMS Setup failed. A SMS installation failure usually fails in one of these categories: Disk issue Security issue SQL Server issue A few common SMS site server installation issues are listed here, together with the recommended strategy for solving the issue: When SMS Setup fails because of a disk space issue; ensure that the NTFS partition you are using has sufficient Read More