The mini rhytidectomy

PURPOSE: The relationship between green tea intake and serum concentrations of total cholesterol, triglycerides, and high density lipoprotein cholesterol was examined. METHODS: The subjects were 630 middle-aged men and their 370 wives sampled from five regions of Japan during 1989-1991. Consumption frequency of 38 foods, including green tea, was determined by interview. Three-day food records were collected from 207 of the men and 164 of the wives. The mean serum concentrations of the three lipids were compared according to the three levels of daily green tea intake (< 1 cup, 1-4 cups, and > 4 cups), with adjustments for various health habits, food frequencies, and nutrient intakes. RESULTS: After extensive multivariate adjustments for nondietary and dietary covariates, green tea was not associated with any of the lipid levels. CONCLUSIONS: The results of this cross-sectional study do not support the beneficial effects of green tea on serum lipid levels.     

地球、金星大气寿命的计算

假定行星大气层中气体分子的逃逸过程是准静态过程,推导出了气体分子的逃逸方程,定义了行星大气分子的逃逸率及行星大气的半寿命,给出了数学表达式.根据数学表达式,假定不同的大气温度,计算了地球和金星大气层的半寿命.结果表明,地球和金星大气层的半寿命远超过宇宙年龄(约1010y),因而是非常稳定的.本理论可应用于其他行星和月球大气层半寿命的计算.     

复杂条件村庄群下开采方案探讨

通过对开采区域地质条件和村庄情况分析,针对高潜水位状况,探讨选择适宜村庄下开采方案,以最大程度提高资源回收率和实现煤矿经济效益最大化。     

生态型绿化法在上海"近自然"群落建设中的应用

应用生态型绿化法建设"近自然"群落是城市植被恢复的种新途径.生态型绿化以生态学潜在自然植被和群落演替基本理论为依据,选择适生乡土植物,应用容器育苗和"近自然"苗木种植技术,超常速、低造价地营造具有群落结构完整、物种多样性丰富、生物量高、趋于稳定状态、后期完全遵循自然循环规律的"少人工管理型"绿地.生态型绿化法已在世界各地广泛应用,对于推动我国城市绿化也将起到重要作用.     

贵州榕江县八蒙地区锑矿床地质特征及找矿远景

八蒙锑矿床位于扬子准地台与华南褶皱带之间的过渡带,是雷公山Sb-Pb-Zn-Cu成矿带上的重要组成部分。通过对八蒙地区锑矿床地质特征及成矿地质条件进行分析,认为该矿床的形成主要受地层岩性和构造条件控制。结合前人研究成果,探讨了矿床的成矿物质来源和形成过程,并计论了该区找矿远景,供区内后续找矿工作参考。