超临界流体中的酶催化

与其他非水相酶催化介质相比 ,超临界流体有其独特的优越性。阐述了超临界流体的概念、对超临界流体的选择原则以及在超临界流体中酶催化的各种影响因素 ,还讨论了在此类流体中酶催化的应用和发展前景     

国内中小皮化企业如何适应激烈的市场竞争

总结了目前国内中、小皮化企业中存在的主要问题 :自主开发能力差 ,造成产品品种单一、配套性差 ;新产品市场推广能力也较差 ,造成即使有好的产品 ,也无法打开市场 ;而普遍存在的制革厂欠款 ,皮化企业自身体制陈旧及国外皮化公司的进一步本土化策略 ,使国内皮化企业面临更严峻的挑战。根据自身多年经营皮化材料的经验 ,提出了切实可行的应对措施     

“两步法”求取双目视觉传感器中摄象机位置关系

根据平行线“消隐点”理论，提出了用于双目视觉传感器自标定的“两步法”。该方法仅需４对消隐点象面坐标便可线性求解出旋转矩阵，再用２个空间点坐标便可线性求解出平移矢量。     

铸造合金凝固过程瞬时应力的测试

以计算机采集处理系统为手段,测试了应力框铸件凝固过程的瞬时应力.结果表明,该方法简便、速度快,精度高,可获得铸件凝固过程瞬时应力及温度的动态变化过程。     

Rapid synthesis of La0.7Sr0.3MnO3+λ catalysts by microwave irradiation process

Microwave irradiation processing (MIP) was considered as a potential method to synthesize perovskite-type oxides rapidly, cleanly and energy-efficiently. In this paper, La_0.7Sr_0.3MnO_3+λ, a kind of promising catalyst for automobile exhaust purification, was successfully prepared by MIP in not more than 5 min. The sol–gel method was also used for comparison. All the samples were evaluated by catalytic activity tests in the simulated exhaust and characterized by XRD, BET, TEM and XRF analyses. The results showed that the integrated perovskite-type phase and uniform particle size were obtained in the microwave-treated samples. And those ones exhibited a better oxidation activity under slightly oxygen-rich condition than that by sol–gel method, which may be related to more A-site cation vacancies and larger bulk oxygen content generated in MIP. Possible formation mechanism of perovskites in MIP was also discussed.     

Comparison of prototype and rote instruction of English names for Chinese visual characters

This study compared prototype and rote instruction of English names for Chinese visual characters. In the prototype condition, participants were taught the meaning of the prototype that served as the distinctive feature of multicomponent characters. In the rote condition, participants traced the character and wrote its translation. Participants learned more rapidly and maintained more words in the prototype condition.     

光学活性物质的工业生产方法

本文介绍了光学８活性牺牲垢几种工业规模的生产方法及最新的进展，分析了各种方法的特点及存在的问题。     

一种新型卷绕方式CPW介绍及应用

主要介绍了德国ＮＥＵＭＡＧ公司开发的新型高速卷统方式ＣＰＷ（致密精密卷绕）的工艺技术特点，并对引进和应用该设备技术的生产情况及其产品质量做了对比分析．     

反射补偿式光纤位移传感器的理论分析

概述了反射式光纤传感器的发展。讨论了这类光纤传感器理论分析中所采用的纤端出射光场光强径向均匀分布的假设。给出了纤端出射场的光通量分布函数,并以全光路补偿反射式光纤探头为例,建立了补偿机理的理论分析方法,给出了传感特性调制函数的解析表达式。最后,简要分析了这类光纤传感器的温度稳定性问题。