Volume Shadow Copies Overview Volume shadow copies, a new Windows Server 2003 feature, are used to create copies of files at a specific point in time, or set time interval. Shadow copies can only be created on NTFS volumes to create automatic backups of files or data per volume. When enabled, the Shadow copies feature protects you from accidentally losing important files in a network share. Remember that when users delete files from over the network, those files are permanently deleted. Because shadow copies enable users to view previous versions Read More

A solar pool heater is a device that uses the sun’s power to heat a pool. Solar pool heaters are ergonomically designed to absorb the maximum amount of sunlight without imposing on the user’s comfort. Solar pool heaters allow the user to change the water temperature without even getting out of the pool. They can operate all day long and even run at night, as a built-in battery that stores excess energy during the day powers them. Solar pool heaters are usually used in small pools and hot tubs, but Read More

“Privacy is the ability of an individual or group to seclude themselves or information about themselves and thereby reveal themselves selectively.”  That is the definition offered by Wikipedia, and it makes sense. Privacy is all about concealment of information about an individual or a group, and the ability to control what of it to reveal and what to keep private. Privacy has been a big topic as of late, which is unsurprising considering that we are living in an age of information; the time when access and sharing of information Read More

Eddy currents are also referred to as Foucault currents and are created when conductors are exposed to a changing magnetic field because of a field source’s relative motion. Their applications include induction heating and non-destructive testing. Eddy currents are continually researched in order to develop new applications. How do Eddy Currents Work? Eddy currents are created when a conductor is exposed to a magnetic field that changes due to the field source’s and/or the conductor’s motion. Magnetic field variations, which create a current within the conductor’s body over time, may Read More

A heterodyne is a circuit that transfers a signal from one carrier wave to another with a different frequency. It mixes the input signal with a wave generated by an oscillator to create two new signals, called beats. While heterodyning is a simple process governed by the laws of trigonometry, most heterodynes are complex devices with several filters and amplifiers. Heterodyne Beats A beat is a signal produced by two input signals with different frequencies. A heterodyne produces two beats, one with a frequency that is the sum of the Read More

The Terminal Services Manager tool (Tsadmin.exe) is the main administration tool used to manage existing Terminal Services sessions, users, and processes that are connected to or running on the Terminal Services server. The Terminal Services Manager tool can manage one or more Terminal Services servers. The administrative tasks that the Terminal Services Manager tool can perform are listed below: View information on existing Terminal Services servers, users, and any connected or running sessions and processes. Connect and disconnect from sessions. Terminate existing sessions and processes. Log off users from sessions. Read More

IMAX, which stands for Image Maximum, is a motion picture format with the capacity for greater size and clearer resolution than standard movie systems. It was developed by the Canadian IMAX Corporation. It dramatically enhances image resolution by making use of larger film stock (70mm with 15 perforations per frame – 10 times larger than standard). This results in a movie with incredible clarity, even on huge screens that are the hallmark of IMAX theaters worldwide. This, combined with a six-channel sound system, results in an extraordinary movie-going experience. IMAX Read More

Hydrogen-powered cars are still currently under the development stage. A hydrogen car runs mainly on either a hydrogen fuel source like that of an internal combustion engine, or on a fuel cell like that of an electric car. Hydrogen comes in abundance in many of the things we could see today, most especially petroleum. It is a very light gas that is flammable and could be used as a fuel source, or could be directly burned in a way similar to that in conventional internal combustion engines. How It Works Read More

A PIN, or Personal Identification Number, is a number that is used on some SIM cards to prevent unauthorized use of the cell phone it is located in. PINs are not used by all SIM cards and may need to be setup before they can be used. A PIN is generally between 4 and 8 digits long and may consist of a “PIN1” for locking the phone itself as well as a “PIN2” for locking certain features that the phone has access to. However, emergency calls can still be made Read More

A zip file works by acting as a container to transport the file. The same way that random things aren't tossed around a cargo ship–instead, they stack cargo containers to save space–sending files without first zipping them results in less available space. A zip file comes in handy when you are trying to send a lot of files through e-mail. You can't send too many, but when they are zipped, you can send more. How Do Zip Files Work Zip files works by doing three things. The first thing that Read More