Model of Primary Austenite Dendrite Structure in Hypoeutectic Cast Iron

Ｉｔｗａｓｒｅｐｏｒｔｅｄ[1] ｔｈａｔｔｈｅｍｉｃｒｏ ｓｔｅｒｅｏｓｔｒｕｃｔｕｒｅｏｆｐｒｉｍａｒｙａｕｓｔｅｎｉｔｅｉｎｃａｓｔｉｒｏｎｃｏｎｓｉｓｔｓｏｆｐｒｉｍａｒｙｓｔｅｍｓａｎｄｓｅｃｏｎｄａｒｙａｒｍｓｔｈａｔ ｇｒｏｗａｃｃｏｒｄｉｎｇｔｏｄｅｎｄｒｉｔｅｃｒｙｓｔａｌｓｂｒａｎｃｈｒｕｌｅ ,ａｎｄｓｏｍｅｏｆｐｒｉｍａｒｙａｕｓｔｅｎｉｔｅｅｖｅｎｈａｖｅｔｈｉｒｄａｒｍｓ .ＭｉｙａｋｅＨｅｔａｌ[2 ]ｐｒｏｐｏｓｅｄａｃｏｎｃｅｐｔｏｆｒｅｇｉｏｎｍｏｄｅｌｂｙｓｔｕｄｙｉｎｇ…     

能控广义系统与不能控广义系统集之间的距离

本文讨论了能控广义系统与不能控广义系统集之间的距离问题,得出了该距离的下界估 计式及相应的算法.     

Chaos control and noise suppression in external-cavitysemiconductor lasers

Feedback-induced chaos and intensity noise enhancement in a laser diode with external optical feedback are studied by computer simulations. The enhancement of relative intensity noise (RIN) that is often observed in experiments is considered as a result of the feedback-induced deterministic chaos and the intensity noise suppression is treated from the viewpoint of chaos control. Especially, the conventional noise suppressing technique known as a high-frequency injection modulation is turned into a problem of stabilizing chaos through parameter modulations. We developed an analytical method which allows to optimize the modulation frequency from the linear stability analysis of the dynamical model that describes the laser diode with external feedback. The robustness of the modulation with respect to the modulation frequency and depth is verified and the results suggest the feasibility of applying our method to actual noise suppression. The RIN in the low-frequency region (up to 100 MHz) is shown to be reduced to the solitary laser level when the feedback-induced chaos is effectively controlled with the optimized modulation frequency     

Suppression of MHC class II expression by human class II trans-activator constructs lacking the N-terminal domain

The class II trans-activator (CIITA) is a bi- or multi-functional domain protein which plays a critical role in the expression of MHC class II genes. We report that removal of the N-terminal 151 amino acids, encompassing all of the acidic domain but leaving intact the proline/serine/threonine-rich domain, results in a mutant protein with potent suppressive properties for MHC class II expression. HeLa cells stably or transiently transfected with mutant CIITA constructs showed up to 99% suppression of MHC class II antigen induction by IFN-gamma and marked suppression of HLA-DRA mRNA expression. Transient transfection of a B lymphoma line resulted in up to 89% reduction of constitutive MHC class II expression within 5 days and suppression of HLA-DRA mRNA synthesis.     

80m高钢筋砼烟囱的爆破拆除

论述了控制爆破拆除钢筋砼烟囱的方案设计与力学计算、爆破参数确定、施工方法、安全防护措施、震动监测和爆破效果.     

氧化还原功能纤维的研究 Ⅷ．含正丙胺基吸附剂与Au~（3＋）的氧化还原反应机理

通过元素分析、红外光谱分析、光电子能谱分析以及扫描电子显微镜分析等手段，证实含正丙胺基吸附剂与Ａｕ３＋的氧化还原反应过程中，氮原子邻近的羟基碳或Ｃ－Ｈ键被氧化，而氮原子并未参与氧化还原反应；吸附态Ａｕ（３＋）最终部分被还原成单质金；在非水介质中吸附在吸附剂上的金聚集成颗粒状。     

Effect of aromatic diamine extenders on the morphology and property of RIM polyurethane–urea

An aromatic diamine, CMOMDA, was synthesized and used as a chain extender for reaction injection molding (RIM) polyurethane–urea. The morphology and properties of CMOMDA-, DETDA-, and MDA-extended poly(ether–urethane–urea)s (PEUUs) were measured by IR, DSC, DMS, SEM, and tensile testing apparatus. Well-matched values of C_h and X_ut,b/C_h were necessary for aromatic diamine-extended PEUU. DSC and SEM showed that the aggregation state of hard segments might undergo some changes with increasing hard-segment content. © 1994 John Wiley & Sons, Inc.     

用微脱胶技术表征芳纶纤维材料界面强度

采用微脱胶原位技术表征了Ａｐｍｏｃ，芳纶－Ⅱ纤维复合材料界面结合强度。     

钛酸铅系薄膜的热释电性能及其应用

叙述了钛酸铅系薄膜的热释电原理，介绍了国际上近几年钛酸铅系薄膜材料、制备工艺及热释电性能，并与块状陶瓷材料进行了比较，分析表明钛酸铅系薄膜具有优良的热释电性能及可观的应用前景。     

新一代的国际互联网通信协议：IP Version6

本文通过对ＩＰｖ６和ＩＰｖ４协议的比较，讨论了新一代国际互联网通信协议ＩＰｖ６的特点，新增加的功能，并指出ＩＰｖ６协议的颁布对现有技术的影响和相应对策。