SEM analysis of the changes of carbon layer structure of mesocarbon microbeads heat-treated at different temperatures

Mesocarbon microbeads (MCMB) with narrow size distribution, excellent sphericity and no obvious conglutination have been prepared with a coal tar pitch containing quinoline insolubles (QI) as the raw material. Optical microscopy and scanning electron microscopy (SEM) are used to examine the structure of the MCMB. It has been found that SEM technique shows the structural information of MCMB clearly in the form of micrographs even when the structure of MCMB is complex, while the optical technique is useful for analysis of the regular structure of the mesophase spheres but cannot be effectively used to analyze either the complex structure of the green MCMB or the structures of the further heat-treated ones at different temperatures. According to the characteristics of the carbon layers, the structures of the as-prepared MCMB in the present experiment could be classified as (I) Parallel Layer type structure and (2) Bent Layer type structure with the carbon layers gathering at one or two points in the MCMB. In the experiments, SEM is also utilized to investigate the structures of MCMB that are heat-treated at different temperatures. It has been found that the MCMB without any further heat-treatment show no layered-carbons, while the ones heat-treated at temperaturehigher than 1000℃ exhibit obvious layered carbons across their sections. When increasing the heat-treatment temperature, the carbon layers become thinner and flatter.     

Preparation and properties of antimony thin film anode materials

Metallic antimony thin films were deposited by magnetron sputtering and electrodeposition. Electrochemical properties of the thin film as anode materials for lithium-ion batteries were investigated and compared with those of antimony powder. It was found that both magnetron sputtering and electrodeposition are easily controllable processes to deposit antimony films with flat charge/discharge potential plateaus. The electrochemical performances of antimony thin films, especially those prepared with magnetron sputtering, are better than those of antimony powder. The reversible capacities of the magnetron sputtered antimony thin film are above 400 mA h g^-1 in the first 15 cycles.     

K-拟可加模糊数值积分的零可加性与绝对连续性

在K-拟可加模糊测度空间的任一子集上,针对给定的某一个μ-可积模糊数值函数,建立所谓的K-拟可加模糊数值积分.进而将这种积分整体看成可测空间上取值于模糊数值的集函数,应用其积分转换定理,讨论它们的零可加性和绝对连续性等.     

可拓神经网络在可拓专家系统中的研究与应用

将可拓学理论、人工神经网络和专家系统技术有效地组合与集成,建立了基于可拓分析与神经网络的空中目标识别专家系统,并将其应用于防空作战指挥信息系统空中目标识别。着重阐述了基于物元的知识表示方法以及空中目标识别专家系统的设计思路、总体结构和工作原理。     

船用平台式INS光学标校初始对准方法研究

为了解决航海型平台式惯性导航系统（INS）非自主式初始对准问题，建立了不同观测量条件下统一的INS初始对准方程。通过系统可观测性分析，得出增加外部姿态角的观测信息将有效提高INS平台失准角和惯性元件误差的估计能力的结论。设计出一种独特的可测量低动态载体两维姿态的高精度光学测量系统（OCS）用以提高航海型平台式INS初始对准精度。建立OCS／GPS／计程仪（LOG）／INS初始对准卡尔曼滤波器，并进行了基于部分试验数据的数字仿真，与传统的基于位置和速度的GPS／LOG／INS初始对准方法相比，基于OCS的系统不仅缩短了对准时间，还有效改善了系统惯性元件的误差估计精度。     

气动式水下发射装置的可调节发射阀仿真研究

为实现气动式水下武器发射装置对不同武器出管速度的调节，提出了使用新型可调节发射阀的气动式水下武器发射装置的实现方案。根据该方案建立了内弹道教学模型，并进行了系统仿真。仿真结果表明：所提出的实现方案是可行的。     

附有回售条款的可转换债券的鞅定价

从定量的角度分析了附有回售条款的可转换债券的价值构成，并在股票价格服从对数正态分布的条件下，利用Martingale Pricing方法推导出其定价公式．     

新型层状农药缓/控释材料—草甘膦插层双金属氢氧化物的超分子结构与缓释性能

以镁铝双金属氢氧化物(MgAl layered double hydroxide: MgAl-LDH)为主体, 以草甘膦(Glyphosate: GLY)为客体, 通过控制反应pH值, 由共沉淀法组装得到两种不同结构的GLY插层MgAl-LDH缓/控释材料. 考察了该缓/控释材料在Na₂CO₃溶液中的缓释性能, 其缓释历程为客体阴离子与介质中CO₃^2-的离子交换过程, 客体阴离子在插层化合物层间及晶粒间隙的扩散, 即粒内扩散过程为释放速率控制步. 低pH合成GLY插层产物较大的层间距、层间客体GLY阴离子单层垂直的定位方向及较高的堆积密度使其较高pH合成材料展示出更为显著的缓释能力, 其原因归结为超分子结构对释放速率控制步的影响. 该研究指出了层状双金属氢氧化物在农药缓/控释领域的应用潜力.     

草酸盐法合成Li_aNi_(0.7)Co_(0.3)O_2及电化学性能研究

采用草酸盐沉淀及高温固相反应相结合的方法合成了锂离子电池的活性正极材料Li_aNi_(0.7)Co_(0.3)O_2.XRD、SEM及电化学测试数据表明:该材料结晶及层状结构良好,首次充放电比容量为175.4mAh/g和142.9mAh/g,循环30次后放电比容量仍为136.0mAh/g,比容量损失只有4.8%.