局部自由度及其应用

探讨了局部自由度在机械中的应用，并将其归纳为三个方面：变滑动为滚动、改善车辆的平衡和运动状况、改善力的分布。     

含氟织物整理剂的单体及共聚方法

概述了含氟织物整理剂的典型结构和含氟共聚单体和非含氟共聚单体的种类及其共聚反应的方法.     

六氟环氧丙烷的合成

介绍了六氟环氧丙烷的性质、用途及其制备方法,并对其几种制备方法进行了比较.     

一氯二氟醋酸的合成和应用

一氯二氟醋酸是一典型的含氟化学品,本文对其性质、合成方法和应用进行介绍.     

中国岩溶地面塌陷及防治

根据大量资料和试验对中国岩溶塌陷的成因类型和机理提出了新的看法,对近代岩溶塌陷提出了自然充气防塌法并已取得良好效果。     

六氟丁醇的制备和应用

六氟丁醇（HFB）是一种十分有用的含氟醇，有着广泛的应用前景。六氟丁醇（２，２，３，４，４，４－Hexafluorobutanol－１；Hexafluorobutanol），结构式：CF３CFHCF２CH２OH，分子式：C４H４F６O，分子量：１８２．０６，CAS号：３８２—３１—０。六氟丁醇为淡黄色液体，密度（２５℃）：１．５４g／cm３，沸点：１１４℃（１０１．３kPa），闪点：５１℃；室温时的饱和蒸汽压：１０mmHg；折射率nD２５：１．３１４１；粘度（２０℃）：４．４cs；易燃、有毒，LD５０：９５０mg／kg。１六氟丁醇的应用１．１作溶剂六氟丁醇…     

Properties of Magnetite Nanoparticles Produced by Magnetotactic Bacteria

The magnetic nanoparticles(magnetite) were prepared through the fermentation of the Magnetospirillum strain WM-1 newly isolated by our group. The samples were characterized by TEM, SAED, XRD, rock magnetic analysis, and Mossbauer spectroscopy. TEM and SAED measurements showed that the magnetosomes formed by strain WM-1 were single crystallites of high perfection with a cubic spinel structure of magnetite. X-ray measurements also fitted very well with standard Fe3O4 reflections with an inverse spinel structure of the magnetite core. The size of crystal as calculated by the Debye-Scherrer's equation was approximately 55 nm. Rock magnetic analysis showed WM-1 synthesized single-domain magnetite magnetosomes, which were arranged in the form of linear chain. The high delta ratio((δFC / δZFC = 4) supported the criteria of Moskowitz test that there were intact magnetosomes chains in cells. The Verwey transition occurred at 105 K that closed to stoochiometric magnetite in composition. These observations provided useful insights into the biomineralization of magnetosomes and properties of M. WM-1 and potential application of biogenic magnetite in biomaterials and biomagnetism.     

高精度铝带材纵剪机

介绍了高精度铝带材纵剪机的类型及最新技术，并对影响剪切质量的关键因素、张力控制形式等进行了综合分析。     

Dynamic mechanical property of hybrid fiber reinforced concrete(HFRC)

The uniaxial compressive response of steel-polypropylene hybrid fiber reinforced concrete(HFRC) and steel fiber-reinforced concrete(SFRC) was analyzed under high strain rate loading with a 74 mm diameter split Hopkinson pressure bar(SHPB).The experimental investigation focused on recorded data and resulted in distinguishing the strain rate that mobilized different ductility of steel-polypropylene hybrid fiber reinforced concrete(HFRC) and steel fiber-reinforced concrete(SFRC).64 specimens of HFRC and SFRC with higher static compressive strength were tested at the strain rates changing from 20 to 120 s-1.The static compressive strength and dynamic stress-strain curves of the two materials were obtained at 4 different strain rates and the failure stress,and peak strain and peak toughness were also analyzed.The results show that HFRC has quite good dynamic mechanical property and clear strain-rate effect,and the failure mechanism of HFRC and SFRC was also compared based on the specimens’ failure modes in static and dynamic compressive tests.