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.     

短路电流限制器对电力系统暂态稳定影响的研究

快速短路电流限制器（ＦＦＣＬ）是限制电力系统短路电流的有效措施之一。主要研究了一种新型的短路电流限制器在电力系统中的配置及其对电力系统暂态稳定的影响,通过试验系统的验算,得到一些有益的结论。     

白家电的节能设计

介绍了安森美半导体一系列高能效典型应用于白家电产品的电机驱动器及控制器方案。     

基于混沌电路参数敏感性的信号检测方法研

提出了基于混沌电路参数敏感性的信号检测方法,并分析了用倒锯齿映射来实现这种参数式检测应用的优点,即实现倒锯齿映射的电路结构比较简单,电路输出的符号序列与映射参数在零初值时能够排序.在以该方法为基础的温度测量实验研究中,加入热敏电阻作为主要的感温元件,使测温精度大大提高,说明该方法具有一定的发展潜力,值得进一步研究.     

Prognostic factors after hepatic resection for hepatocellular carcinoma associated with Child-Turcotte class B and C cirrhosis

OBJECTIVE: To evaluate prognostic factors after resection of hepatocellular carcinoma (HCC) in patients with Child-Turcotte class B and C cirrhosis. SUMMARY BACKGROUND DATA: Although hepatic resection remains the mainstay in the treatment of HCC and can be performed with low morbidity and mortality rates in patients without cirrhosis, its role is poorly defined for patients with severe cirrhosis. METHODS: From 1986 to 1996, partial hepatectomy was performed for HCC in 63 patients with Child-Turcotte class B (n = 46) and C (n = 17) cirrhosis. There were 46 men and 17 women, with an average age of 61.2 years (range 35 to 79 years). Associated conditions were diabetes mellitus in 45, esophageal varices in 32, severe hypersplenism in 26, cholelithiasis in 13, gastroduodenal ulcer in 6, and hiatal hernia, gastric lymphoma, splenic abscess, and pancreatic cyst each in 1. Concomitant surgical procedures were performed for most of these conditions. RESULTS: Major complications occurred in 17 patients (27%), six (9.5%) of whom died within 1 month after surgery. The overall in-hospital death rate was 14.3%. Liver failure and intraabdominal sepsis were mostly fatal complications. The overall and disease-free survival rates, respectively, were 70.2% and 64.5% at 1 year, 43.5% and 23.8% at 3 years, and 21.4% and 14.9% at 5 years. Multivariate analysis with the Cox regression model revealed that favorable factors for survival were Child class B, no transcatheter arterial embolization before surgery, young age, and low alanine aminotransferase (ALT) level before surgery. CONCLUSIONS: Hepatic resection can provide a favorable result in young patients with HCC complicating Child class B cirrhosis with low hepatitis activity, but transcatheter arterial embolization before surgery should be avoided in such patients.     

合金元素对碳钢和低合金钢在大气中耐腐蚀性的影响

对我国七个试验点十七种钢的八年大气腐蚀试验数据用动力学公式D=At~n作了回归处理,用逐步回归方法获得了主要合金元素含量与公式中系数A_1n的关系式,探讨了合金元素对碳钢和低合金钢在大气中耐腐蚀性的影响。磷、铜提高钢的耐大气腐蚀性能;硫急剧降低钢的耐大气腐蚀性;硫、磷含量在很小范围内即有明显作用。与一般概念相反,硅能提高钢的耐大气腐蚀性能,铬、镍的影响不大。     

太阳能LED街灯的挑战及安森美半导体高能效解决方案

LED替代传统的荧光灯和HID金属灯具有明显的优势,将成为太阳能街灯的重要光源。本文探讨了利用安森美半导体的CS51221充电控制器结合最大峰值功率跟踪功能提升太阳能电池板能效以满足LED街灯供电的需要。     

通用照明市场中的高亮度LED驱动挑战暨安森美半导体解决方案

本文以LED驱动为重点,分析了通用照明市场LED驱动面临的挑战,并结合安森美半导体的高性能LED驱动解决方案,探讨了不同的LED驱动应用示例,如通过交流隔离电源为LED供电和通过宽输入范围DC—DC电源为LED供电等;最后,还介绍了能够用于需要高可靠性和持续性的LED应用中的安森美半导体LED分流保护解决方案。     

应用于白家电的变频器智能功率模块(IPM)技术及方案

白家电产品的节能问题日益受到世界各国的关注,变频器技术的应用可明显提高其能效。本文介绍了安森美半导体变频器智能功率模块(IPM)使用绝缘金属基板技术(IMST)的特征及应用方案。