FIBER-REINFORCED COPPER MATRIX COMPOSITES FABRICATED BY ELECTROCHEMICAL INFILTRATION TECHNIQUE

［中文文摘］基于电化学浸渗技术(ECI)在室温下制备了连续铜纤维、碳纤维和玻璃纤维增强铜基复合材料。实验结果表明,在本实验工艺条件下可获得致密的纤维/Cu基复合材料,并具有优良的力学性能。复合材料的断口形貌及显微结构的SEM观察表明,纤维与铜基体之间的界面结合良好,纤维不受任何损伤。证实了ECI在室温下快速制备纤维增强金属基复合材料的可行性。［英文文摘］Continuous-fiber-reinforced Cu matrix composites were fabricated based on the electrochemical infiltration technique (ECI). The experimental results show that the dense fiber/Cu composites have been obtained on the present condition, which possess good mechanical properties. The fracture surface morphology and microstructures of the composites have been observed by SEM. It is indicated that the interfacial bond between fibers and Cu matrix is very well and the fibers do not have any damage. The ECI is　feasible to prepare rapidly fiber reinforced metal matrix composites at room temperature

Investigated of Fiber-reinforced Metallic Matrix Composites Prepared by Electrochemical Method

［中文文摘］提出了利用电化学方法在室温下制备纤维增强金属基复合材料的新技术.详细阐述了制备工艺过程,并通过SEM观察了复合材料的断口形貌及显微结构.实验证实电化学浸渗技术具有在室温下快速制备纤维增强金属基复合材料的优点,导电或不导电纤维可用来作为增强剂.导电纤维可直接用于电化学浸渗,而不导电纤维在使用之前要进行表面金属化处理.初步实验结果表明,在5.5V和8h的沉积条件下可获得致密的纤维/铜基复合材料.［英文文摘］A novel technique of preparing fiberreinforced metallic matrix composites by electrochemical method was proposed. The processing procedures were described in details, and the fracture surface morphology and microstructure of the present composites have been observed by SEM. It is demonstrated that the electrochemical infiltration technique has obvious merits over the conventional processing techniques in the preparation of fiberreinforced metallic matrix composite. Either conductive or nonconductive　fibers may be used as reinforcing agents. Conductivefibers can be electrochemically infiltrated without additional treatment , while non2conductive fibers need to be surface2metallized before use. Preliminary experiments have shown that densefiber/copper matrixcomposites areobtainable at 5.5 Vfor 8 hfor the systems studied

土壤介质振动传递特性模型试验及实测研究

设计了一个土壤介质振动传递试验模型,测量得到了振动加速度响应随距离、激励力大小以及激励频率的变化规律。试验结果表明,响应随距离的增大而减小,随激励力的增大而增大,随激励频率的增大而增大。同时对北京地铁十三号线太阳园段进行振动测量,实际测量结果与模型实验测量结果对比分析表明,土壤介质振动传递试验模型可以很好的反应轨道交通振动的传递特性

Design of a novel capacitor: multifiber ceramic capacitor

［中文文摘］提出了一种新型多纤维陶瓷电容器(MFC)。MFC由众多纤维电容器并联而成,而每根纤维电容器由内电极(导电纤维)、介电层和外电极构成。理论分析表明,当纤维直径与介电层厚度相匹配时,MFC的电容比多层电容器(MLC)的电容大,而且MFC也具有更优异的抗击穿性能。［英文文摘］Based on the fundamental principles of ceramic capacitor, a new type of capacitor designated as multifiber capacitor (MFC) is proposed. It is made up of fiber capacitors (elements) connected in parallel and bonded together with a binder. Each element consists of fiber core (inner electrode), dielectric coating and outer electrode. Theoretical analysis indicates that MFC has the optimum and greater capacitance in comparison with multilayer capacitor (MLC), when the diameter of fiber core is carefully　matched with the thickness of dielectric coating.MFC also has better resistance to dielectric breakdown

Preparation and Properties of PVDF Matrix Piezoelectric Composites Containing Highly Aligned BaTiOs Whiskers

以高度定向的BaTiO3晶须作为活性相、聚偏氟乙烯(PVDF)作为基体制备了压电复合材料.研究了该复合材料的介电和电学性能.研究结果表明,以BaTiO3作为活性相的晶须复合材料与粉末复合材料相比,其介电常数(ε)、压电常数(d33)和剩余极化率(Pr)大大提高,而其损耗因子(tanδ)具有相反的趋势.对晶须复合材料,沿晶须定向方向的ε、d33和Pr的值比晶须平行方向要高得多.分析了产生这些差别的原因.A piezoelectric composite was prepared with highly aligned BaTiO3 whiskers as active phase and polyvinylidene fluoride (PVDF) as matrix. Its dielectric and electromechanical properties were investigated. The experimental results show that the dielectric constant (ε), piezoelectric constant (d33) and remnant polarization (Pr) are considerably higher in the whisker composite than in the corresponding composite containing BaTiO3 powders as the active phase, while the loss factors follow the opposite trend. For the whisker composite, ε, d33 and Pr along the direction of the whisker orientation (normal specimen) are much higher than the values normal to the whisker orientation (parallel specimen). The reasons for the observed differences were discussed

Preparation and Properties of PVDF Matrix Piezoelectric Composites Containing Highly Aligned BaTiOs Whiskers

［中文文摘］以高度定向的BaTiO3晶须作为活性相、聚偏氟乙烯(PVDF)作为基体制备了压电复合材料.研究了该复合材料的介电和电学性能.研究结果表明,以BaTiO3作为活性相的晶须复合材料与粉末复合材料相比,其介电常数(ε)、压电常数(d33)和剩余极化率(Pr)大大提高,而其损耗因子(tanδ)具有相反的趋势.对晶须复合材料,沿晶须定向方向的ε、d33和Pr的值比晶须平行方向要高得多.分析了产生这些差别的原因.［英文文摘］A piezoelectric composite was prepared with highly aligned BaTiO3 whiskers as active phase and polyvinylidene fluoride (PVDF) as matrix. Its dielectric and electromechanical properties were investigated. The experimental results show that the dielectric constant (ε), piezoelectric constant (d33) and remnant polarization (Pr) are considerably higher in the whisker composite than in the corresponding composite containing BaTiO3 powders as the active phase, while the loss factors follow the opposite trend.Ｆor the whisker composite,ε,d33 and Pr alonf the direction of the whisker orientation (normal specimen)are much higher than the values normal th the whisker orientation (parallel specimen).The reasons for the observed differences were discussed

两种泥鳅不同核质关系下EST和MDH同工酶基因表达的研究

采用聚丙烯酰胺胶不连续系统电泳方法分析了泥鳅和大鳞副泥鳅不同组合、不同核质关系下，胚胎改良阶段（０－１４５ｈ）酯酶（ＥＳＴ）和要酸脱氢酶（ＭＤＨ）同工酶的分化表达谱式。ＥＳＴ同工酶随细胞质、细胞不同及胚胎发育各个时期具有不同的个体发育谱式。以泥鳅卵子为细胞质环境的Ⅰ、Ⅱ两组，杂交组（Ⅱ）的ＥＳＴ同工酶基因在受精后３ｍｉｎ至原肠中期，雄核原因参与表达与调控。以大鳞副泥鳅为细胞质环境的Ⅲ、Ⅳ两组，各

两种泥鳅不同核质关系下EST和MDH同工酶基因表达的研究

采用聚丙烯酰胺凝胶不连续系统电泳方法分析了泥鳅和大鳞副泥鳅不同交配组合、不同核质关系下，胚胎发育阶段（０～１４５ ｈ） 酯酶（ＥＳＴ） 和苹果酸脱氢酶（ＭＤＨ） 同工酶的分化表达谱式。ＥＳＴ 同工酶随细胞质、细胞核不同及胚胎发育各个时期具有不同的个体发育谱式。以泥鳅卵子为细胞质环境的Ⅰ、Ⅱ两组，杂交组（ Ⅱ） 的ＥＳＴ同工酶基因在受精后３ ｍｉｎ 至原肠中期，雄核基因参与表达与调控。以大鳞副泥鳅为细胞质环境的Ⅲ、Ⅳ两组，各酶均以细胞质调控为主。ＭＤＨ 同工酶在各组合及各个发育阶段均未表现出实质性差异，发

两种泥鳅不同核质关系下LDH同工酶基因表达的研究

采用聚丙烯酰胺不连续系统凝胶电泳方法分析了泥鳅和大鳞副泥鳅不同杂交组合不同核质关系下胚发育阶段（0－145h）中乳酸脱氢酶（LDH）同工酶的分化表达谱式，ＬＤＨ同工酶的基因表达随细胞质、细胞核不同及胚胎发育各个时期具有不同的个体发育谱式，以泥鳅卵子为细胞质的Ⅰ、Ⅱ两组，杂交组（Ⅱ）ＬＤＨ同工酶基因在受精后３min至原肠中期雄核基因参与表达与调控，部分基因位点比本交组（Ⅰ）启动与表达的时间要早，两组的管家酶主要来自细胞质。以大鳞副泥鳅为细胞质的Ⅲ、Ⅳ两组，各酶均以细胞质调控为主，其管家酶与泥鳅有很大不同。并具体分析和讨论了不同核质关系ＬＤＨ同工酶基因的表达和调控的时空顺序

两种泥鳅不同核质关系下LDH同工酶基因表达的研究

采用聚丙烯酰胺不连续系统凝胶电泳方法分析了泥鳅和大鳞副泥鳅不同杂交组合不同核质关系下胚发育阶段（0－145h）中乳酸脱氢酶（LDH）同工酶的分化表达谱式，ＬＤＨ同工酶的基因表达随细胞质、细胞核不同及胚胎发育各个时期具有不同的个体发育谱式，以泥鳅卵子为细胞质的Ⅰ、Ⅱ两组，杂交组（Ⅱ）ＬＤＨ同工酶基因在受精后３min至原肠中期雄核基因参与表达与调控，部分基因位点比本交组（Ⅰ）启动与表达的时间要早，两组的管家酶主要来自细胞质。以大鳞副泥鳅为细胞质的Ⅲ、Ⅳ两组，各酶均以细胞质调控为主，其管家酶与泥鳅有很大不同。并具体分析和讨论了不同核质关系ＬＤＨ同工酶基因的表达和调控的时空顺序