ESR Spectroscopy (Electron Spin Resonance Spectroscopy or Electron Paramagnetic Resonance Spectroscopy) is a technique used for studying chemical species that have one or more “free radical” or unpaired electrons. Most stable molecules only have paired electrons without any free radicals, so ESR Spectroscopy is used less often than NMR (Nuclear Magnetic Resonance) Spectroscopy, the usual technique for studying chemical bonds. This also means that ESR Spectroscopy is a highly specific technique. How does ESR Spectroscopy Work? A constant photonic frequency, such as microwave radiation, is used in conjunction with an Read More

Alexa is a subsidiary of Amazon.com which ranks web sites based upon actual user traffic to those sites. User traffic is monitored using the The Alexa Toolbar. Users voluntarily download and install the Alex Toolbar because includes a Popup Manager and Google Search, and also displays Site Info, Alexa Traffic Rank, and Related Links. Hudson Scripting provides an Alexa Ranking tool which will display the Alexa Traffic Rank of many web sites simultaneously. Understanding Alexa Traffic Ranks In Alexa Traffic Ranks, a lower number is better. The number 1 site Read More

RSA, which stands for Rivest, Shamir, and Adleman, is a security algorithm used in digital cryptography. RSA differs from older symmetric algorithms because it has the ability of allowing digital signing as well as advanced encryption for online commerce systems and high-profile institutions. RSA was one of the first major advancements in digital cryptography but is now widely used to secure financial, personal, and corporate-level information for a variety of domestic and commercial users. How RSA Works RSA involves the use of three individual functions. The first function of RSA Read More

Bluescreen 0x0000007b (0x7b) is a stop error that is displayed whenever the user is attempting to boot from a device that is inaccessible. An inaccessible boot device is usually a computer’s primary hard drive, but can be a CD player, USB port, or Flash Drive, depending on which device the user is attempting to boot from.   What Causes Bluescreen 0x0000007b? A wide variety of malfunctions, the most popular being that the user’s boot device has failed or has become corrupted, can cause Bluescreen 0x7b. The difference between a corrupted Read More

IP Access Lists What is an Access List? Access lists are used to control and manage access of interesting and non interesting traffic. Access lists are powerful tools for controlling access both to and from network segments. They can filter uninteresting packets and be used to implement security policies. Using the right combination of access lists, network managers will be armed with the power to enforce nearly any access policy they can invent. After the lists are built, they can be applied to either inbound or outbound traffic on any Read More

Adobe Flash Player is a high-performance, expressive client runtime software that delivers great digital experiences to end users. These days, Web sites are built in Flash, and individuals need to have Flash Player installed on their computers to render Web sites. Adobe releases new versions of Flash Player at regular intervals, and end users are required to update the installed player with the latest version. The install procedure is simple, but sometimes Flash Player may not install and work correctly. Some of the factors to be considered are the following: Read More

YouTube is a video file sharing website that millions of people around the world use at no charge. It allows users to watch and post an unlimited number of videos, create a user profile, and comment on videos they like. However, YouTube does not offer a means to download or save a YouTube video. Instead, users must depend on a variety of free and commercial programs that third party companies provide in order to download their favorite videos. Several free services for doing so are listed below.   KeepVid KeepVid Read More

Hoverboards in movies are fictional, but there are actual hoverboards — though they are not the size of a skateboard. Hoverboards are simple contraptions that allow the user to travel without parts that would roll over the ground. Hoverboards are an offshoot of the hovercraft. The hovercraft (also known as air-cushion vehicle or ACV) is a vehicle that has been configured to allow travel over land and water. The mechanism of a hovercraft (and the hoverboard, too) is pretty simple. One uses engines to pump air beneath a vehicle. This Read More

A VGA extender is a device that extends a VGA cable’s range without sacrificing quality. VGA extenders are often used in audio/video applications that require a source to be connected to a display device over a long distance. They are usually in the form of a small box and can often extend a VGA connection over 300 feet. VGA extenders may also include other features, such as converting VGA signals to other types of cables. How VGA Extenders Work VGA extenders are made for VGA (Video Graphics Array) cables and Read More

Standard to Metric Conversion Chart   Symbol   WhenYou Know   Multiply by   To Find   Symbol   LENGTH   in inches 2.5 centimeters cm ft feet 30 centimeters cm yd yards 0.9 meters m mi miles 1.6 kilometers km AREA   in² square inches 6.5 square centimeters cm²   ft² square feet 0.09 square meters m²   yd² square yards 0.8 square meters m²   mi² square miles 2.6 square kilometers km²   acres 0.4 hectares ha MASS (weight)   oz ounces 28 grams g lb pounds 0.45 Read More