关于对数积分的基本理论

提出了实对数导数与对数积分的基本理论 ,证明了实对数导数和对数积分与 (常义 )导数和积分的关系及充要条件 ,所得到的定理与公式在实数域内对处理函数乘、除、乘方、开方及复合函数的性质具有独特的优势 .实对数导数与对数积分的基本理论是对经典微积分理论的扩充     

借鉴韩国“新村运动”经验 加快我国新农村建设

为了制定好“十一五”规划,在解决“三农”问题和促进农村经济社会发展方面切实迈出步伐,根据国务院领导的指示,由中研室、中农办、财政部、建设部、人民银行和贵州省的有关同志,到韩国就“新村运动”进行了考察。回国后,考察团提交了《韩国“新村运动”考察报告》和《关于建设社会主义新农村的若干建议》两个成果。我作为考察团团长,深深感到当前要抓住机遇,借鉴韩国经验,把我国社会主义新农村建设摆在国家重大发展战略的高度,切实有效地加以推进。一、韩国“新村运动”的主要做法和成效上世纪六十年代,韩国仍然是一个落后的农业国。1962年…     

Triangulated surface flattening based on the physical shell model

Journal of Mechanical Science and Technology - Triangulated surface flattening plays an important role in the surface shape design of a complex product, such as a vehicle, a train and an air plane....     

Perfluorosulfonated ionomers membranes: Melt‐processing and characterization for ion exchange applications

Perflurosulfonated ionomers membranes with different ionic‐exchange capacity were successfully fabricated via melt‐extruding and casting of their –SO₂F precursors. A systematical investigation of the thermal stability, crystallinity, and rheological properties of the precursors was performed to secure their optimized processing conditions. The tensile properties of acid‐form membranes are found to increase with base‐hydrolysis time, where a tensile strength of 38.2 MPa is readily obtained after 24 h's base‐hydrolysis. The content of –SO₂F or –SO₃H containing side‐chains plays an important role in the thermal stability, rheological, and mechanical properties of the precursor or the acid‐form membranes. The strong ionic interactions, attributed to the –SO₃H groups, lead to decreased crystallinity and tensile strength for different IEC membranes. The acid‐form membranes exhibit good proton conductivity and low methanol crossover in comparison with reference Nafion membrane. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39944.     

循环水厂余压势能回收利用

循环水厂以水轮机代替电机带动风扇转动,充分利用富余的压力势能冷却循环水,达到节能的目的.     

提高云母氧化铁醇酸面漆防沉性能试验研究

分别采用有机膨润土、气相二氧化硅、聚酰胺蜡3种不同的固体防沉剂,对灰云铁醇酸面漆进行了防沉降试验研究。研究结果表明:有机膨润土与聚酰胺蜡组合,并选择合适的配比,成功解决了灰云铁醇酸面漆沉降和黏度增长的贮存问题。而且制备的灰云铁醇酸面漆低黏(6#黏度杯,<90 s)、高不挥发分(>75%),有利于环境保护。     

对硝基苯酚钠生产工艺分析研究

文章以对硝基苯酚钠生产过程作为研究对象,分析生产中的关键控制点,进一步优化工艺参数,达到节能减排、降低能耗的目的。     

Catalyst-Controlled Selectivity in Oxidation of Olefins: Highly Facile Success to Functionalized Aldehydes and Ketones

Catalysis Letters - The attractive challenge in green chemistry is exploring novel heterogeneous catalyst system for catalyst-controlled product selectivity for oxidation of olefins. Hence, we...