Crystals Prisms

crystals prisms

Quartz Crystal And Silica Health Supplements

It is a form of highly synthetic and pure silicon dioxide. Fused silica comes in non crystalline form and it doesn't have any colour. It is a type of silica glass which has less thermal expansion and high transmission power over variety of spectrums especially in ultraviolet. silica is the only pure silica with around 99.4 - 99.9% of silica present in it. This fused silica is mainly used in industries dealing with electronics and they are made by plasma arc, carbon electrode fusion or gas fired continual extrusion and carbon arc. Because of its high insulating and dielectric properties, almost 70% of the electronics industries use silica in its experiments. Some of them also use fused silica in investment casting or as a refractory material as when kept at high temperatures it has a capability to gain back its strength. Because of insulating and dielectric properties, silica is most widely used in electronic circuits.

For various applications, silica comes with different grades. The most important application in which fused silica is used are High Energy Laser Optics where any other optical equipment is nothing compared to the pure silica. Because of its purity and exceptional optical qualities, even if the high energy laser is transmitted it doesn't affect the material much. In the production of prisms, windows and lenses silica is used. Prisms which especially come in the range of 0.16 to 3 vyoms are manufactured using fused silica. Depending on the transmission range, the refractive index may be around 1.55 to 1.40. It has a capability to maintain its strength even at high temperatures and because of this property they are used as a good refractory material. This is mainly because silica has very high melting point, has very high abrasion resistance and low thermal expansion.

How fused silica is manufactured?

silica can be manufactured with the help of two basic steps:

1. Fused silica is produced by the synthesis process. Here the glass is synthesized from the chemicals.

2. With the help of electrical heating or gas, the silica grains are melted which produces fused silica. Depending on the applications, this mixture may be either opaque or transparent.

Advantages:

Different advantages of using silica are as follows:

1. High resistance power to thermal shocks. Even if it is inserted into water directly from red heat, it won't crack.

2. Coefficient value of thermal expansion is very low.

3. High optical transmission power over variety of spectrums especially in ultraviolet.

4. High resistance to chemical substances.

5. Act as great electrical insulation for electrical items and hence it is used in most of the electrical circuits.

6. Less dielectric value and dielectric loss.

The applications in which fused silica are used are windows, mirror substrates, boats, trays, crucibles, lenses, IR transmitting optics, UV transmitting optics and metrology components. It is also used as refractory materials due to its high melting point and great resistance to abrasion and low thermal expansion.

About the Author

Quartz crystal
is made up of two of the most abundant compounds on earth. It is also the source of the purist form of
silica
.

Nokia 7900 Prism Review - Beautiful Build and Features

There are three phones in the Prism collection including the 7900. All of the Prism models are geared toward the female population though some men buy them as well. The main differences that exist between the older and newer models exist within the materials used in the phone body and the dimensions. While the Nokia 6500 Classic is more for the men, Nokia 7900 Prism along with other versions of Prism are basically phones for women. The Nokia 7900 Prism comes in both a black shade and a golden, and while the black is more unisex, the pink of Crystal Prism is definitely geared toward the female population.

The Nokia 7900 Prism has a 1GB internal memory but no slot for memory expansion. Other features of the phone include GPRS Class 32, HSCSD, EDGE Class 32, 3G, Bluetooth 2.0 and USB. It also includes messaging, SMS, MMS and email with a browser that is html enabled. The battery has a talk time of 3 hours and stand by of up to 240 hours. In addition, there is a 2 megapixel CMOS camera with video and flash, an MP3 player, built in hands free device and voice memo.

Although there is very little metal in the phone itself, the main parts are made of metal, thus making it very difficult to break. The phone's display is 2" and has a resolution of 240x320 pixels and can reflect up to 16 million colors. The display is the same was what was used in the Nokia 8800 Arte and is of high quality and clarity. In spite of the basics of this phone, those who use it become emotionally attached to it. It is not a high tech phone that takes time to learn how to use bur rather provides basic features that are easy to learn without overdoing it.

The Nokia 7900 Prism is a great phone for someone who needs a basic small camera phone with minimal memory. It still retains the quality of all Nokia phones but does not include all of the fancy features that most users have come to expect. Although it does include an MP3 player, keep in mind that the 1MB of memory is shared among all phone features, so you may not have much stored memory for music files.

The Nokia 7900 Prism is a great little phone for those who don't need more than the installed memory allows and are not keen on many additional features. It's also a great phone for someone who is not technically savvy or for a new mobile phone user. If you read a Nokia 7900 Prism review, you will discover how well users enjoy this phone in spite of its limited capabilities. It doesn't have a great many fancy features, but it works well for a basic user. You are likely to find mobile phone deals on this phone in many regions or online. Though rather inexpensive compared to more technologically advanced mobile phones, cost savings is always appreciated and accepted.

About the Author

About the Author:

Trying to choose a new mobile phone or do you already know which handset you want but looking for the best deal. For the Nokia 7900 Prism or for any other phone, we provide price comparisons for all uk deals.

Alum Crystal Prism

[phpbay]crystals prisms, 100, "", ""[/phpbay]