Tuesday, August 28, 2007

Light Arrester

In telegraphy and telephony a lightning arrester is to be found where wires enter a structure, preventing harm to electronic instruments within and ensuring the protection of individuals near them. Lightning arresters, also called rush protector, are devices which are linked between each electrical conductor in a power and transportation systems and the earth. These provide a short circuit to the earth that is interrupted by a non-conductor over which lightning jumps. Its function is to limit the rise in voltage when a connections or power line is struck by lightning.

The non-conducting substance may consist of a semi-conducting material like silicon carbide or zinc oxide, or a spark gap. Primitive varieties of such flash gaps are simply open to the air, but more modern varieties are filled with dry gas and provided with a little amount of radioactive material to support the gas to ionize when the voltage across the gap reaches a particular level. Other designs of lightning arresters use a glow-discharge tube associated between the protected conductor and ground, or any one of a many of voltage-activated solid-state switches called varistors or MOV's. Lightning arresters built for substation use are consisting of a porcelain tube several feet in length and several inches in diameter, impressive devices, fill with disks of zinc oxide. A safety port is full on the side of the device to vent the occasional internal explosion without shocking the porcelain cylinder.

Tuesday, August 21, 2007


Java (Javanese, Indonesian, and Sundanese: Jawa) is an land mass of Indonesia and the place of its capital city, Jakarta. Once the centre of controlling Hindu kingdoms and the heart of the colonial Dutch East Indies, Java now plays a governing role in the money-making and supporting life of Indonesia. With a population of 124 million, it is the most heavily populated island in the world; it is also one of the most thickly populated regions on Earth.

Java shaped mostly as the result of volcanic events, Java is the 13th leading island in the world and the fifth major island of Indonesia. A sequence of volcanic mountains forms an east-west spine along the island. It has three main languages, and most populace are bilingual, with Indonesian as their second language. While the popular of Javanese are Muslim (or at least supposedly Muslim), Java has a different mixture of religious beliefs and cultures.

Tuesday, August 14, 2007


Turmeric (Curcuma longa) is a rhizomatous herbaceous continuing plant of the ginger family, Zingiberaceae which is citizen to tropical South Asia. It wants temperatures between 20 and 30 deg. C. and a significant amount of annual rainfall to succeed. Plants are gathered yearly for their rhizomes, and re-seeded from some of those rhizomes in the following season.It is also often pronounced as tumeric. It’s name vary according to region, in some Asian countries as kunyit.
Its rhizomes are boil for several hours and then dried in hot ovens, after which they are position into a deep orange-yellow powder generally used as a flavor in curries and for dyeing, other South Asian cuisine, and to impart color to mustard condiments. Its active component is curcumin and it has an bitter, earthy, peppery flavor.Sangli, a town in the southern part of the Indian state of Maharashtra, is the largest and most important trade centre for turmeric in Asia or maybe in the entire world.

Tuesday, August 07, 2007

Electromagnetic hypersensitivity syndrome

Some users of mobile handsets have reported feeling several unspecific symptoms during and after its use, such as flaming and tingling feelings in the skin of the head and extremities, fatigue, sleep disturbances, dizziness, loss of mental attention, reaction times and memory retentiveness, headaches, malaise, tachycardia and disturbances of the digestive system. Some researchers, implying a causal relationship, have named this syndrome as a new diagnostic entity, EHS or ES. The World Health Organization prefers to name it “idiopathic environmental intolerance", in order to avoid the insinuation of causation.