灌注桩有限元——无限元耦合分析

用有限元———无限元耦合数值方法，对现场试验灌注桩进行计算，并将其结果与试验结果作分析比较     

Reactions of bis(3-aminopropyl)amine with formaldehyde in the presence of a metal ion: Preparation of a metal-free macropolycycle and a dinuclear copper(II) complex

The reaction of bis(3-aminopropyl)amine with excess formaldehyde in the presence of Ni²⁺ ion produces the macropentacyclic compound L¹(ClO₄)₂ (1) L¹ = 1,3,7,11,13,17- hexaazapentacyclo[15.3.1.1^3.7.1^7.13.1^13.17]tetracosane). The dinuclear complex [Cu₂(L²)₂(H₂O)₂](ClO₄)₂ (2) (HL¹ = 1-(3-aminopropyl)-3-(hydroxymethyl)-1,3-diazacyclohexane) as well as 1 can be prepared by the condensation reaction in the presence of Cu²⁺ ion. Interestingly, 2 · 2H₂O exhibits uncommon magnetic behavior.     

Effects of spinning speed and heat treatment on the mechanical properties and biodegradability of poly(lactic acid) fibers

We undertook this study to suggest the optimal spinning process conditions that provide a proper range of tenacity and biodegradability in textile fibers. The effect of melt‐spinning speed and heat treatment on the mechanical properties and biodegradability of poly(lactic acid) (PLA) fibers were investigated. PLA was spun at a high spinning speed of 2000–4000 m/min, and each specimen was heat‐treated. Mechanical properties were estimated by measurement of the breaking stress, and the degree of crystallinity was evaluated with wide‐angle X‐ray scattering. Biodegradability was estimated from the decreases in breaking stress, weight loss, and degree of crystallinity after soil burial. The results of the experiment reveal that heat treatment of the PLA fibers increased the breaking stress and crystallinity. With increasing spinning speed, breaking stress and crystallinity also increased. An increase in spinning speed was more effective than an increase in heat treatment for enhancing the breaking stress within the range of this study. From the soil burial test, it was revealed that an increase in spinning speed and heat treatment decreased the biodegradability of the fibers. X‐ray analysis of the soil‐buried fibers showed that fibers with higher crystallinities began to degrade more slowly. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3099–3104, 2007     

Synthesis and characterization of pyridine‐containing poly(imide‐siloxane)s and their adhesion to copper foil

A series of pyridine‐containing poly(imide‐siloxane) (PIS) copolymers with different amounts of PDMS with various segmental lengths were synthesized from 2,6‐diaminopyridine (DAP), α,ω′‐aminopropylpoly(dimethylsiloxane) (PDMS), 1,3‐bis(4‐aminophenoxy)benzene (APB), and 4,4′‐oxydiphthalic dianhydride (ODPA). A modified synthetic approach was applied instead of approaches commonly reported in the literature, to ensure the incorporation of DAP and PDMS. The effects of the content and the segmental length of PDMS on the thermal glass transition temperature (T_g), dielectric constant, and surface electrical resistivity of the copolymer are investigated. The copolymers were attached to copper foil by hot‐pressing, and changes in wettability caused the peel strength of the laminates to increase with the PDMS content, but to decrease as the DAP content increased. Furthermore, X‐ray photoelectron spectroscopy was employed to determine the loci of failures (LOF) of the laminates and to monitor the movement of LOF, which varies with the PDMS content. For those laminates with good peel strengths, the LOF occur in the interior of PIS layer, indicating that the adhesion is cohesive rather than adhesive. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

SPD在快速自动测色中的应用

本文在比较两类基本测色方法的基础上，引出了快速多通道测色系统。介绍了ＳＰＤ在快速自动测色应用中的工作原理和设计方案，并提出了ＳＰＤ实现的多通道测色仪器的光谱定标和光度定标方法，由此进行测色实验。最后，针对实验结果，对系统存在的测量误差进行了分析和校正，获得了满意的效果，充分说明了ＳＰＤ在快速自动测色系统中的应用完全达到了工业中颜色测控的技术指标。     

汽车转向系减振器减摆效果仿真计算分析

采用仿真计算方法,对汽车转向系液压阻尼减振器消减一种国产微型汽车独立悬架转向轮摆振的效果进行了分析。建立了该车转向系的五自由度集总参数摆振分析模型,并确定了模型的各种参数;应用数值方法求解系统摆振运动微分方程组,进行了多种情况的摆振仿真计算分析,得出了关于采用阻尼减振器控制转向轮摆振的几点重要结论。     

带保护涂层的V—B—RE共渗膏剂工艺的研究

对４０Ｃｒ，Ｔ１０，ＧＣｒ１５，ＣｒＷＭｎ，Ｃｒ１２钢进行了带保护涂层的Ｖ－Ｂ－ＲＥ共渗膏剂工艺的研究。使用所研制的Ｖ－Ｂ－ＲＥ共渗膏剂，可实现钢在共渗后的直接淬火，渗剂在淬火时自行脱落。试验结果表明：涂层外侧是以ＶＣ为主的碳化物，内侧是以Ｆｅ２Ｂ为主的硼化物。涂层最高硬度可达ＨＶ０．１２１００～２３００，耐磨耐蚀性能良好，渗层与基体结合紧密，硬度梯度平缓。工艺设备简单，最适合单件小批或大件局部的     

基础化学实验室“三废”的绿色化回收与处理

基础化学实验室是高校上课人数多、容易产生污染和安全事故的地方,如何减少或者尽量消除化学污染和安全隐患,是实验教学人员应该重视的新课题。文章重点探讨了实现化学实验室绿色化的安全举措以及三废回收与处理措施。