苄叉丙酮实验的改进

将薄层色谱技术应用于苄叉丙酮的合成实验，通过薄层色谱对合成反应过程的监控，增加了实验的探究性，提高了学生分析问题、解决问题的能力．     

四川省地震灾区婴幼儿营养监测状况分析

作者通过对四川省青川县和彭州市两个地震灾区6-24个月龄婴幼儿健康状况的统计分析,发现该地区生长发育状况不佳,存在营养不良现象,其中贫血率较高。经过对比进行营养包6个月干预后的人群统计分析,发现营养状况稍得到改善,其中彭州市目标人群贫血改善明显,由此提出面对四川其它或其它类似贫困地震地区,由于贫困,天灾必然加剧受灾人群的营养状况,特别是贫血率状况,针对这些地区的求援,必须紧迫加强营养包的干预,而且需要持续性的干预,比较可靠的预算应该在灾难期6个月以上方有一定的作用,同时必要的管理措施有利于保证营养干预对象的稳定性,提高营养干预的有效性的。     

薄煤层采区车场连续跨巷施工技术的探讨

通过合理的分析薄煤层群采区车场连续垮巷施工技术的可行性,并将其运用到矿井的实际生产中,并采取严格的安全技术措施和合理构筑的安全设施,既回收了煤炭资源,又加快了施工进度,同时减少了矸石的外运,减小了工人的劳动强度和副井的提升强度,达到了安仝经济、快速施工的目的。     

薄壁壳体类铝件的数控加工

从图样分析、加工工艺、数学建模、工艺参数设置、刀路生成、加工程序的模拟仿真以及后置处理等几方面详细分析薄壁壳体类铝件数控加工的实例,提出采用真空吸盘装夹零件的新工艺。为解决薄壁壳体类铝件难装夹及加工时易变形的问题,提供了一套较为完整的数控加工方法。     

H~∞(D)与C(M)之间的闭子代数

美国密执安州立大学数学系的 S·Axler 教授在[4]中开始了对 H∞(D)与 C(M)之间闭子代数结构的研究和猜想。由于 H∞(T)(T 表示单位圆周)与 L∞(T)之间闭子代数的完全刻划以及两类代数的某种相仿性使人们希望用解决 H~∞(T)与 L~∞(T)之间闭子代数结构的相似的方法去获得 H~∞(D)与 C(M)之间闭子代数结构的类似结论。但本文定理—证明了 H~∞(D)与 C(M)之间的所有团子代数的极大理想空间均为 M,给出了两类代数结构较本质的区别。从而否定了解决两类代数结构方法的相似性。而在 Axler[4]的基础上获得的定理二,则给出了比[4]更—般的结论.从而使人们希望对 C(M)中的元素 f 有 H~∞〔f,f〕与 H~∞[f]相等这样的结论成立.     

对会计电算化发展的思考

电子计算机在会计上的应用从根本上解脱财会人员的繁重手工劳动，腾出精力来从事财务管理工作。由于会计电算化工作目前在我国还处于生长发育期，因此在当前的会计电算化工作中产生了一些不可忽视的问题，也对会计电算化的发展提出了新的要求。本阐述了会计电算化的总目标和具体目标，分析了目前会计电算化中存在的若干问题，思考了发展会计电算化工作的对策。     

Characterization of DC magnetron sputtering deposited thin films of TiN for SBN/MgO/TiN/Si structural waveguide

INTRODUCTION Monocrystalline SBN (Strontium barium nio-bium, SrxBa1?xNb2O6, denoted SBNx?100, where 0.25≤x≤0.75) solid solution, is currently being inves-tigated as potential material for many micro-device applications, such as piezoelectric infrared detectors, piezoelectric, electro-optic modulators, and holo-graphic storage (Koch et al., 1998), because SBN has one of the largest known linear electro-optic coeffi-cients (r33=1300 pm/V for SBN75), two orders of magnitude larger th…     

小河嘴煤矿高效薄煤层成套装备采煤机的研制与应用

川煤集团达竹公司在现有薄煤层电牵引采煤机实践应用的基础上,研制出MG150/350-PWD型爬底板式无链电牵引采煤机(以下简称MG150/350-PWD型采煤机)。本文介绍了该采煤机的特点与工业性试验情况,可为今后我国发展薄煤层采煤机的研制工作提供一种设计思路。     

Design of non-polarizing thin film edge filters

INTRODUCTION The design of tilted edge filters which avoid the polarization problems is a much more difficult task than that of polarizer design and there is no com-pletely effective method (Macleod, 2001). Edge fil-ters are divided into two main groups, long-wave-pass and short-wave-pass. They are widely used for vari-ous optical purposes, especially in wavelength divi-sion multiplexers (WDM) (Nosu et al., 1979) and multimedia color projection display (Zhang et al., 1999). Unfortunate…     

Historical plasters on light thin vaults: State of conservation assessment by a Hybrid ultrasonic method

Historical plasters on light thin vaults, usually made by mats of reeds nailed to an upper wooden framework, were used in several historical and monumental Italian buildings and churches built between the 16th and the 19th century and almost all of the historical Italian theatres built between the 18th and the 19th century to cover the theatre-hall and to improve its acoustic properties. The non-destructive inspection of these structures is very important, but traditional inspection techniques are usually limited in resolution, which may be a problem for detection of defects at a very early stage. The paper presents the development and application of a high-resolution inspection technique based on a hybrid ultrasonic method, where a contact emitter probe and a non-contact air-coupled receiver probe are used. Results show the effectiveness of the method on laboratory samples and propose an inspection procedure for in-field application.