导热PA6复合材料导热性能的研究

将氮化硼和氧化铝等助剂混合后,经过平行双螺杆挤出机制备了导热PA6复合材料,研究了将不同粒径的氮化硼和氧化铝复配对尼龙6复合材料导热系数的影响。结果表明:采用不同粒径的氮化硼和氧化铝复配,添加60%的含量可得到导热系数为1.869的导热PA6复合材料。     

Two-layer synchronized ternary quantum-dot cellular automata wire crossings

ABSTRACT: : Quantum-dot cellular automata are an interesting nanoscale computing paradigm. The introduction of the ternary quantum-dot cell enabled ternary computing, and with the recent development of a ternary functionally complete set of elementary logic primitives and the ternary memorizing cell design of complex processing structures is becoming feasible. The specific nature of the ternary quantum-dot cell makes wire crossings one of the most problematic areas of ternary quantum-dot cellular automata circuit design. We hereby present a two-layer wire crossing that uses a specific clocking scheme, which ensures the crossed wires have the same effective delay.     

四种无机矿石的红外光谱计算方法表征

本研究采用Gaussian03计算化学程序软件中3-21G（基组），或6-31G（d）（基组）在HF水平上模拟绘制四种无机物矿石（方解石，金红石，赤铁矿和石膏）主要化学成分的红外谱图。首先使用GaussView搭建分子模型，利用Gaussian03优化其几何结构，然后逐一通过Gaussian03程序软件计算其振动频率。在计算得到的频率值中没有一个虚频，证明得到的红外谱图对应的是优化后的分子结构。通过计算得到的各个无机物矿石的红外谱图经与文献中查得的红外谱图实验数值相对照，得出结论为应用Gaussian03能够普遍较为快速地绘制出无机矿物的红外谱图，如果是非简谐振动的非对称振动模式，则有少数吸收峰位置误差较大，它具有一定的实际对比使用价值。     

La2O3/γ-Al2O3酸碱性对肉桂醛MPV反应的影响

用封锁酸(碱)性位点的方法,研究了La₂O₃/γ-Al₂O₃的酸碱性对肉桂醛MPV反应还原为肉桂醇的影响。结果表明,La₂O₃/γ-Al₂O₃的酸性和碱性位点均对肉桂醛MPV反应有影响,而催化剂酸性位点对反应的影响大于碱性位点。     

Na20-- A1203 -- SiO2微晶玻璃体系熔体结构的分子动力学模拟

采用分子动力学方法模拟了7种组分的Na20-- A1203 -- SiO2体系微晶玻璃熔体结构,分析了体系的径向分布函数、键长分布和键角分布,得出了不同含量Na＋对Na20-- A1203 -- SiO2体系玻璃网络结构的影响。     

BaTi4O9介电陶瓷的低温烧结

研究液相多元添加对BaTi4O9介质陶瓷的烧结和介电性能的影响.通过添加(CuO和V2O5)烧结助剂来达到降低烧结温度的效果,并且使其保持较好的高频性能.实验结果表明在添加合适的烧结助剂下,烧结温度为1180℃时,BaTi4O9介电陶瓷在1MHz下的介电性能:ε=41.2,tan δ=5,τ=82 ppm/℃.基本保持了良好的介电性能.     

Study on corrosion resistance of pure magnesium with CaSiO3 contained coating in NaC1 solution

A composite coating was fabricated on pure magnesium by hydrothermal treatment in order to reduce its degradation in body environment.The coating was characterized by scanning electron microscopy(SEM) and X-ray diffraction(XRD).The XRD pattern showed that the main composition of the coating was a mixture of CaSiO3,MgSiO3 and Mg(OH)2.Electrochemical test showed that the corrosion current density(icorr) of the coated magnesium was decreased by about two orders of magnitude compared with that of the bare magnesium,and the EIS measurement also showed that the corrosion resistant performance of the coated magnesium was significantly enhanced.Meanwhile,weight loss test showed that the weight loss of the coated magnesium was lower than that of the bare magnesium.Hence,the present study indicated that the composite coating could greatly slow down the degradation of pure magnesium.     

上海山阳镇农村河道生态护岸类型的探讨

针对上海金山区山阳镇农村河道现状进行了分析,阐述了河道破坏的原因以及对其进行生态护岸建设的必要性,并介绍了几种适合山阳镇河道的生态护岸的基本形式,以期指导该地区农村河道改造工作。     

西部凹陷曙4—4—03井区潜山储层研究

阐述了曙4－4－03井区潜山储层特征及其分布规律,分析了构造,岩石性质等因素对储集性质的影响,通过应力场分析和利用5700,测井技术,对潜山裂缝的倾角,倾向以及变化趋势进行了描述,为该区的滚动勘探开发提供了地质依据,。     

BaTi_4O_9(f)/0.64BaTi_4O_9-0.36BaPr_2Ti_4O_(12)复合陶瓷的介电性研究

借助X射线衍射技术 (XRD) ,低频阻抗法 ,X射线光电子能谱 (XPS)等手段对BaTi4O9(f) /0 .6 4BaTi4O9-0 .36BaPr2 Ti4O1 2 复合陶瓷新材料的相组成、介电性能和样品中Ti元素的价态变化进行了研究 .研究结果表明 :该复合陶瓷新材料只由BaTi4O9和BaPr2 Ti4O1 2 两相组成 .加入BaTi4O9纤维后 ,复合陶瓷材料中Ti3 + 离子和Ti2 + 离子的含量降低 ,氧元素的含量提高 ,并对该材料体系的介电性有明显的改善作用 ,其中含 10 %BaTi4O9纤维的BPT10试样的性能最佳 ,其εr=6 4,tgδ =1× 10 - 4 (1MHz) .