工程管路中波纹管膨胀节的选型与应用

分析了管路系统主固定支架的受力情况,指出了波纹管膨胀节选型的注意事项.在剖析1个工程实例后,提出了合理的处理方法.     

改善陶瓷颗粒／金属基体润湿性的方法

本文讨论了改善陶瓷颗粒与金属基体之间润湿性的各种工艺方法,分析了每种方法的原理及特点,对每种方法列举了一些实例,提出了实际生产中的最佳工艺方法.     

耦合双桩共振子MDM波导结构中光学性质的研究

采用时域有限差分方法研究了同侧和异侧耦合双桩共振子的MDM波导结构中的光学性质．发现同侧耦合双桩共振子的MDM波导中桩间距改变时对透射谱影响很大,当间距较小时,出现两个很尖锐的透射峰,当间距较大时,其中一个峰消失,另一个峰增强．异侧耦合双桩共振子的MDM波导结构中桩长度不一样时,能导致Fano共振而产生新的尖锐的峰．     

多糖金属配合物的研究进展

多糖金属配合物由于其结构和生物活性的特殊性已成为当今天然产物研究领域的热门课题,研究的热点主要集中在植物类多糖铁复合物和壳聚糖与钙、铁、铜、稀土元素离子形成的配合物上。该文对多糖金属复合物的制备工艺、理化性质和药理作用、工业用途等方面进行了综述。     

Hydrothermal synthesis,structures and properties of metal phosphonates based on m-xylylenediphosphonic acid

In this work, a series of new metal phosphonates were hydrothermally synthesized and structurally characterized based on m-xylylenediphosphonic acids （H4L）, including [M（H2L）（bpy）] （M = Mn 1, Co 2）, [MH2L）（phen）] （M = Co 3, Cu 4）, and [Cu2（H2L）2（bpy＂）2] 5 （bpy = 2,2＇-bipyfidine, phen = 1,10-phenanthroline, bpy＂ = 4,4＇-dimethyl-2,2＇- bipyridine）. X-ray diffraction indicated that compounds 1 and 2 were isomorphic. Complexes 3 and 4 were shown to crystallize in different space groups but had similar crystallographic units. In the complexes, H4L was seen to partially deprotonate to afford H2L^2-. The H2L^2- ligands in 1-4 functioned as tetradentate ligands with each phosphonate group adopting bidentate coordination mode with two M centers to generate a 2D layer. In addition, the H2L^2- anions in 5 functioned as tfidentate ligands with one phosphonate group adopting the bidentate mode and another phosphonate group adopting the monodentate mode, thus linking three Cu atoms to provide a 1D chain. The IR and thermal stabilities of these compounds were subsequently examined.     

Progress in the research of radical anion ligands and their complexes

Recent progress in the research of radical anion ligands and their complexes with metals were summarized in this review. Radical anions were sorted into several types including iminosemiquinonate and iminoquinonate radical, nitroxide radical, heterocycle radical etc. Structural characteristics and properties of the corresponding complexes were introduced. The complexes exhibited novel properties and possibility for applications in organic magnetic materials and transition metal catalysis.     

微纳米卟啉金属有机络合物的合成

我们通过一种简单的绿色合成方法,得到微纳米尺度的金属卟啉配合物,并通过选择不同的金属离子,实现了对金属卟啉配合物的可控组装,得到了从零位、一维和二维的金属卟啉配合物.并借助扫描电镜、红外光谱、X射线衍射谱(XRD),X射线光电子能谱(XPS)等对其结构进行了表征,详细考察了其影响纳米结构的影响因素和动力学生长过程.     

浅析21世纪材料的发展前景

介绍了21世纪各种金属和非金属材料的发展状况,特别是新型材料在新的领域及各个领域所起到的关键性作用,简要分析了各种材料的性能,综述了材料的研究现状和发展前景,指出了选择材料所应注意的几个问题。     

基于正交设计试验的双锥药型罩结构优化

双锥药型罩成形的影响因素复杂,其壁厚、上锥角、下锥角以及上锥高度占比4个参数对形成射流的特性、侵彻性能产生重要影响。基于正交设计方法分析以上因素对射流特性及侵彻能力的影响。选取双锥药型罩的以上4个参数为正交优化的4个因素,将射流头部速度、速度梯度以及有效长度作为优化时主要的评价指标,对双锥药型罩进行结构方案优化。通过分析双锥药型罩数值仿真优化结果,得到药型罩上锥角为25°、下锥角为55°、壁厚为3.5 mm、上锥占比60%时,其形成的射流具有较好的破甲效果。     

环境污染原生动物监测的研究进展

简要概述了原生动物在监测环境污染方面的优势,论述了以草履虫为典型代表的原生动物在监测重金属离子和化学农药造成的环境污染方面的研究进展,并且提出了原生动物在环境污染监测中存在的问题,还对其应用前景做出了展望.