针对标志及建筑物装饰照明等应用的智能LED控制及接口方案

本文介绍了适用于标志和建筑物装饰照明的安森美半导体LED驱动器主要产品性能及其特点,并给出了应用示例。     

中高功率照明LED驱动器方案

针对中大功率LED照明应用的不同需求,介绍了安森美半导体单段式和两段式功率因数校正(PFC)控制器方案。     

大幅优化离线电源轻载能效的安森美半导体创新PFC控制方案

本文介绍了安森美半导体具有新颖电流控制频率反走(CCFF)技术的NCP1611 PFC控制器的性能特点,该控制器负载适应能力更强,效率提高,明显减少噪声。     

满足新应用需求的先进PFC技术及解决方案

功率因数校正（PFC）是电源设计中的关键内容之一。本文介绍了交错式PFC和无桥PFC等新颖拓扑结构的先进PFC技术及实现方案。     

Regional redistribution of blood during air cooling of unanesthetized rats

3-hr exposure to air at +5 degrees C of unrestrained rats evoked a relative reduction of blood volume in vessels of the skin, skeletal muscles, abdominal and pelvic organs (except liver). Increase of the blood volume occurred in the brain, thoracic organs, and in the liver. No significant decrease of the rectal temperature was noticed at that, in spite of cooling of the skin of different parts of the body and tail. Cooling of restrained rats at +5 degrees C during 1 and 3 hrs decreased the rectal temperature. The main direction of the blood redistribution involved its removal from the liver to the deep muscle tissues. At the beginning of the cooling and immediately after self--warming the relative increase of the blood volume was more obvious in the skeletal muscles of the anterior body parts.     

Leiomyosarcoma of the larynx in an 8-year-old girl

Poor issues in the most cases concerned were due to gastric resection either not adeqately indicated of performed with technical shortcomings. It is quite possible to reduce considerably the number of poor late results if the resection is performed on strict indications with proper accomplished of its technical details.     

The pharmacokinetics of propranolol when used with the propercuten transdermal therapeutic system (experimental data)

The pharmacokinetic studies of propranolol following the application of the propercuten transdermal therapeutic system were performed in conscious rabbits previously assigned to 3 groups. Different forms of propercuten (forte and mite) were used in different groups, different areas of its application being employed. Pulsed intravenous injections of propranolol were given to Group 1 rabbits to conduct another series of pharmacokinetic studies. The rate of drug administration to the systemic bed was 0.08 mg/h per cm propercuten. The constant injection rate was maintained during 5 days, but when propercuten was withdrawn the elimination time of propranolol was 24 hours.