Stone-containing pyelocaliceal diverticulum: a case report

We report a case of stone-containing pyelocaliceal diverticulum. A 68-year-old man was admitted for extensive investigation of microscopic hematuria on January 12, 1983. A cluster of numerous small calcifications was disclosed in the left renal region on an abdominal plain film and the case was considered to be of stones in the left kidney. An excretory pyelogram showed that the stones were away from the collecting system of the left kidney. Through partial nephrectomy, 107 stones were removed on January 21, 1983. Histological examination of the surgical specimen revealed pyelocaliceal diverticulum. The stones were found to consist of calcium oxalate and calcium phosphate by infrared spectrophotometry. In addition to these components, a small amount of magnesium was detected by X-ray microanalysis. A scanning electron microscopic study of the cut surface of the stones disclosed the presence of a granular core identified as urate and calcium oxalate, concentric laminations of crystallized substances in the mid-zone and laminations of amorphous substances in the outer layer

Development of Microwave Dielectric Materials and Its Applications

[中文文摘]详细论述了微波介质材料与器件国内外现状和技术发展趋势, 分析了应用前景和国内市场需求,对我国“十一·五”发展方向和重点研究课题提出了建议。[英文文摘]Presented are the histores, recent situation and development of microwave dielectric materials and its applications. The communication market, research and production of the microwave dielectric materials and devices in China and the solutions are discussed

水生生物毒性试验方法

水生生物毒性试验方法是水生毒理学的重要组成部分，目前已广泛地应用于测定和评价化学物质的毒性，工业废水的排放管理，渔业保护，水质的卫生评价以及水源保护等方面。早在50年代末，我国环境保护工作者就进行了化学物质对鱼类的急性毒性试验，二十多年来，各地有关单位和大专院校相继开展了这方面的研究工作，积累了不少资料和经验，为发展我国的水生毒理学奠定了良好的基础。近年来，随着社会主义现代化建设事业的飞速发展，局部地区的水源污染日趋严重，保护水源已成为我国四化建设中不可掉以轻心的重要任务。为了对各种化学物质进行正确的评价和提高水质生物测试的可靠性，各地环保工作者期待有一本较为系统地介绍水生生物毒性试验方法的著作。有鉴于此，我们查阅了国内外大量有关文献，并结合我们在这方面的实践经验，编写成册，以供读者参考。有关国外水生毒理学研究的新趋向，本书仅作概要的介绍，读者可据此查阅有关文献

Summary of Measurement of Earning Meanagement

盈余管理又叫盈余操纵 ,意指公司的管理层为达到其个人效用最大化或公司市场价值最大化的目的 ,而对利润进行人为的“管理”或“操纵” ,使盈余信息失去了真实性。研究盈余管理首先要解决盈余管理的测度问题 ,西方有关赢余管理的测度模型主要有希利模型、迪安吉洛模型、琼斯模型、修正的琼斯模型和行业模型。 5种模型都已广泛应用于赢余管理的研究中 ,但各种模型的测度效果在西方仍存在着争论。总的来说 ,琼斯模型和修正的琼斯模型得到较多的认可。同时各种模型的理论基础也存在着一定的缺陷。Earnings management refers to the manipulation of corporation's management on the reported earnings for maximizing either personal utility or corporate value How to measure the extent of earnings management is the first problem to be solved in earnings management research There are five models for the measurement of earnings management,which are the Healy Model,the DeAngelo Model,the Jones Model,the Modified Jones Model and the Industry Model Although the five models have been widely used in earnings management research,there are many arguments on the measurement effect of these models In a word,the Jones Model and the Modified Jones Model are believed to be more exact in measuring earnings management In a while,there are some defects in the theory based on the model

重视海岸及海洋微塑料污染 加强防治科技监管研究工作

海岸带及海洋环境中的微塑料污染已经成为全球环境问题。我国已对一些典型河口、海湾、海岛周边海域及潮滩开展了微塑料污染的初步调查，积累了一些基础数据。但目前从基础理论、方法学及评估与控制技术等方面都远未达到环境监管的要求。因此，需要从建立和完善微塑料调查、监测与评估的方法学体系，厘清我国海洋微塑料的排放格局与污染分布规律，建立微塑料及其附着污染物的毒理学评价指标体系与参数库，形成海洋及海岸环境微塑料污染控制与管理技术体系等角度开展全面系统研究，解决现有的技术难点和关键科学问题，为我国海岸及海洋环境微塑料污染的监管与安全保障提供科学支撑