1 Phase Energy Meter
Product Details
Application
Model DEM011AG single phase electronic DIN rail active energy meter is a kind of new style single phase two wire active energy meter. It has adopted micro-electronics technique, imported large scale integrate circuit, and used advanced technique of digital, SMT techniques, and etc. The meter completely accords with relevant technical requirements of class 1 single phase active energy meter stipulated in international standard IEC 62053-21. It can accurately and directly measure 50Hz or 60Hz active energy consumption from single phase AC electricity net. It can display total energy consumption by step motor type impulse register. It has following features: good reliability, small volume, light weight, specious nice appearance, convenient installation, and etc. This meter has already gotten the patent certificate from China State Intellectual Property Office at present. Patent certificate NO. ZL 2006 3 0106828.1. All the other country patent certificates are in processing.
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oral contraceptive: birth control pil
In the early 1920s, Austrian scientist Ludwig Haberlandt published a paper suggesting that hormones could be used as an effective means of contraception in animals. While it is unclear, he may have soon after tested a hormone preparation in clinical trials, despite heavy criticism from colleagues who considered contraception to be taboo. Haberlandt’s work, however, came to an abrupt end with his suicide in 1932. Two decades passed before further clinical trials of hormonal contraception were conducted in humans, and then largely at the urging of social activist Margaret Sanger. The first birth control pill was approved in 1960, in the United States.
2. A Life-Saving Contaminant
In 1928 Scottish bacteriologist Alexander Fleming was in the process of sterilizing bacterial culture plates that had become contaminated with mold when he noticed clear zones circling mold colonies. The mold toxin responsible for killing the bacteria turned out to be penicillin, which Australian pathologist Howard Walter Florey and British biochemist Ernst Boris Chain later successfully isolated and purified to produce what became arguably the world’s most effective live-saving antibiotic. Incidentally, Fleming seemed to thrive on contamination—his other major discovery, of the antiseptic enzyme lysozyme in 1921, was made after he had accidentally contaminated a culture plate with his own cold germs.
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