Permittivity of free space or vacuum permittivity refers to the interaction between electricity and force as well as the effects of space on electrons. In a purely theoretical sense, permittivity of free space refers to a vacuum’s ability to maintain the bonding effects of individual electrons. Permittivity of free space allows the size and intensity of an electric or magnetic field to be measured within a vacuum.   How Permittivity of Free Space Works Permittivity of free space can be seen as a constant in theoretical physics and can be Read More

Yahoo Mail is a browser based email client that Yahoo provides. It allows users to check their email, create new messages, and organize messages into various categories such as “Inbox,” “Trash,” and “Spam.” Likewise, users can label messages depending on who they are from and their contents. Although many users do not like Yahoo Mail, it is still one of the most widely used browser based email clients available. How to Retrieve Deleted Emails Although users can delete emails in Yahoo Mail, deleted emails are placed in the “Trash” folder Read More

This tutorial will help you create a glass-looking picture frame in Photoshop. First, draw a gradient in the background layer: Next, create a red rectangular box: Then apply this effect to the layer: This will be the result: Then duplicate the layer and flip it vertically to make it look like this: Then draw this shape on a new layer and fill it with white: Next, reduce the opacity: Then again on a new layer fill a box with red to white gradient: Reduce the opacity for this layer also: Read More

RS-232 stands for Recommended Standard 232. It is a standard for serial binary data signals connecting between a Data Terminal Equipment (DTE) and a Data Circuit-terminating Equipment (DCE). It is widely implemented in computer serial ports communication –  roadmap for the way devices speak to each other using serial ports. RS-232 is radically identical to ITU V.24 (signal description and names) and V.28 (electrical). RS232 is an Active LOW voltage driven interface and operates at +12V to -12V. RS232 DB25 Pinouts Pin 1 Protective Ground Pin 2 Transmit Data Pin Read More

Blizzards are severe storms which are marked by extremely low temperatures, high-speed winds and substantial snowfall. They are formed when a region of high atmospheric pressure, termed as a ridge, interacts with a region of low atmospheric pressure. As a result of this, a phenomenon known as advection takes place, in which there is a rush of air from the high pressure region to the low pressure region. The visibility is reduced to less than a quarter of a mile. Three factors necessary for blizzards to form Air below freezing Read More

Physical Security Issues Server security is basically one of the initial security requirements when you install any server operating system. Servers have to be physically secure from physical threats such as physical unauthorized access. Physical security prevents an individual from physically accessing your server, and performing malicious actions. A few guidelines and recommendations for implementing physical server security are detailed below: All servers should be secured in a locked server room. Only those individuals that need access should be permitted to access the server room using a key or security Read More

Like other smartphones, the Android has numerous applications that users can choose from in order to upgrade their phone’s functionality. While many of these applications are games, dozens more are highly practical and aid the user in his/her daily life. The top five android applications are listed below.   Trippo Mondo Voice Translator The Trippo Mondo Voice Translator can convert any phrase into over 30 different languages. It allows the user to either enter a text based phrase manually or record someone who is actually talking in order to hear Read More

In order to understand how sunspots effect radio reception, you need to understand that the light waves and radio waves that the sun emits are both categorized as electromagnetic (EM) radiation. While light waves are visible to the human eye, they are still electromagnetic waves that oscillate. There are many electro magnetic waves, some oscillate very slow and some very fast. The slowest are the long-frequency radio waves. X-rays are some of the fastest EM waves and the light that we see usually falls in the middle of the electromagnetic Read More

Block and Stream Ciphers are two categories of ciphers used in classical cryptography. Block and Stream Ciphers differ in how large a piece of the message is processed in each encryption operation. Block Ciphers Block ciphers encrypt plaintext in chunks. Common block sizes are 64 and 128 bits. Stream Ciphers Stream ciphers encrypt plaintext one byte or one bit at a time. A stream cipher can be thought of as a block cipher with a really small block size. Block Ciphers vs. Stream Ciphers Generally speaking, block ciphers are more Read More

Magnetometers are scientific instruments that measure the direction and strength of magnetic fields in the device’s location. They are used on Earth as well as in space exploration missions due to the magnetic fields’ significant variations based on the nature of the environment, interaction of charged particles from the sun, and the magnetosphere. Why are Magnetometers Used? Magnetometers not only measure a magnetic field’s local strength, they also determine their own direction and orientation. A magnetometer’s design is often tweaked to match the specific device quality that is most important Read More