资讯

人物霍立诚:执掌西门子中国帅印 9月2日,西门子(中国)有限公司对外称,现任总裁兼首席执行官贝殷思将于2005年1月离任,其职位将由现任西门子股份公司医疗系统集团CT业务部总裁的霍立诚博士接替。 在西门子看来,中国对于西门子的全球业务而言,是一个具有战略意义的市场。2004年5月,西门子公司在中国宣布了未来在华“利润与增长”战略,计划在中期将目前40亿欧元的销售额实现再翻一番的目标,同时将在中国进一步注入10亿欧元的投资。     

新生态δ-MnO2对废水中As(v)的吸附研究

利用新生态δ-MnO2对含As(v)的模拟废水进行了吸附实验，结果表明，δ-MnO2对As(v)有良好的吸附特性，有较好的去除率．吸附前MnO2悬浊液的PH值、MnO2的投放量、As(v)的初始浓度、吸附时间、温度等对吸附效果都有一定的影响．却除的最佳条件为：室温下，PH值为6．5，MnO2投放量为100mg，As(v)的初始浓度为10mg／L，吸附时间为2h，去除率可达96％以上。     

YN相互作用和轻超核∧^5He结合能的计算

在手征SU(3)夸克模型基础上，用共振群方法，给出∧N相互作用的非定域位，并用于轻超核∧^5He的结合能的计算，得到了与实验和其他方法相近的结果．     

应用全谱直读光谱仪测定原油中铁和钙元素的含量

提出了利用电感耦合等离子发射光谱ICP -AES法测定原油中铁、钙元素含量的方法 ,考察了雾化压力、RF功率等对被测元素分析线强度的影响 ,确定了仪器的最佳使用条件。试验表明 ,该方法简便、快速、精密度和准确度均令人满意 ,能满足实际应用的要求     

Synthetic Study on Polyhydroxyestrogens Modeled for Inagami-Tamura Endogenous Digitalis-like Factor and Their Activity

1 Results Mammalian possess receptors for digitalis,cardiac glycosides,derived from plants.As one of the results from studies on a real endogenous ligand for the receptors,so called an endogenous digitalis-like factor (EDF) or substance (EDS),Inagami and Tamura isolated a promising candidate possessing a molecular weight,336.We elucidated several possible structures (Fig.1) for the factor and synthesized several modeled compounds,some of which exhibited remarkable constriction at higher concentrations t...     

Investigations on the Sensing Mechanism of Humidity Sensors Based on Poly(4-vinylpyridine)/carbon Black Composite by AC Impedance Spectra

1 Results Investigations on the sensing mechanism is important for understanding the electrical responses of humidity sensors to humidity change,and could provide guidelines for the design and synthesis of humidity sensitive materials with desirable properties.In this work,the sensing mechanism of humidity sensors based on quaternized poly(4-vinylpyridine) (PVP)/carbon black (CB) composite[1] was studied by measuring their AC impedance spectra at various humidities at room temperature.Under low humidity...