Structure study on the thermoelectric materials CexCo4Sb12 (x = 0.5, 1.0) by neutron diffraction

In order to understand the relationship between crystal structure and thermoelectric properties, the neutron diffraction patterns of the thermoelectric materials with the nominal composition Ce_xCo₄Sb₁₂ (x = 0.5, 1.0) were measured at room temperature, the data were fitted by the Rietveld profile refinement method using the Fullprof2k program. It is found that the sample Ce_0.5Co₄Sb₁₂ is composed of two phases, its major phase is CoSb₃ with skutterudite-structure and the Ce atom is not incorporated into the lattice, the impurity is monoclinic CoSb₂. In the case of Ce_1.0Co₄Sb₁₂, the major phase is filled skutterudite, about 10% of the 2a site is occupied by Ce atom, the second phase is monoclinic CoSb₂.     

蒸煮过程复合压力控制系统的设计

本文以造纸厂蒸煮过程压力控制系统为例，介绍了一种新颖的基于参数自调整模糊控制和PI控制的复合控制策略，叙述了模糊控制的基本原理和参数调整的基本过程。同时，简单介绍了工控机控制方案和系统的软件结构。经实践证明，该系统性能良好。     

矢量法改进复合式相复励发电机调压特性

电抗变流复合式相复励有许多优点。本文根据相位和复励调节原理 ,用矢量法调整发电机主、副绕组相位 ,辅以相复励一、二次绕组匝数调整 ,改进三相同步发电机调压特性 ,在全系列相复励发电机开发中应用 ,取得较好效果。     

为测试系统诊断构造基于知识（规则）的诊断系统

随着集成电路测试系统复杂程度的不断提高，其自身的完整性和正确性变得越来越重要。作者所设计并实现的基于知识（规则）的诊断系统ＬＳＴＳ－Ｄｉａｇ实现了对大型测试系统ＬＳＴＳ硬件的故障诊断。本文以基于知识（规则）的诊断系统为背景，以ＬＳＴＳ－Ｄｉａｇ的系统设计方案为主线，论述ＬＳＴＳ－Ｄｉａｇ诊断系统的诊断策略、知识表示方法、诊断推理的运用，以及ＬＳＴＳ－Ｄｉａｇ的系统结构和系统设计，并给出有关系统运行     

On the Logical Foundations of Compound Predicate Formulae for Legal Knowledge Representation

In order to represent legal knowledge adequately, it is vital to create a formal device that can freely construct an individual concept directly from a predicate expression. For this purpose, a Compound Predicate Formula (CPF) is formulated for use in legal expert systems. In this paper, we willattempt to explain the nature of CPFs by rigorous logical foundation, i.e., establishing their syntax and semantics precisely through the use of appropriate examples. We note the advantages of our system over other such systems and discuss the significance of CPFs with regard to the formalization of legal reasonings using examples from the United Nations Convention for the International Sale of Goods.     

Handwritten Chinese Character Recognition Based on Primitive and Fuzzy Features via the SEART Neural Net Model

A handwritten Chinese character recognition method based on primitive and compound fuzzy features using the SEART neural network model is proposed. The primitive features are extracted in local and global view. Since handwritten Chinese characters vary a great deal, the fuzzy concept is used to extract the compound features in structural view. We combine the two categories of features and use a fast classifier, called the Supervised Extended ART (SEART) neural network model, to recognize handwritten Chinese characters. The SEART classifier has excellent performance, is fast, and has good generalization and exception handling abilities in complex problems. Using the fuzzy set theory in feature extraction and the neural network model as a classifier is helpful for reducing distortions, noise and variations. In spite of the poor thinning, a 90.24% recognition rate on average for the 605 test character categories was obtained. The database used is CCL/HCCR3 (provided by CCL, ITRI, Taiwan). The experiment not only confirms the feasibility of the proposed system, but also suggests that applying the fuzzy set theory and neural networks to recognition of handwritten Chinese characters is an efficient and promising approach.     

用异醇铝溶液燃烧化学沉积α-Al2O3纳米晶

本文提出了一种制备高性能纳米陶瓷粉体的新方法.将异醇铝溶液溶于易燃溶剂中配制成初始反应溶液,通过组合喷嘴让该溶液雾化并穿过氧-乙炔火焰,通过化学燃烧制备纳米α-Al2O3粉体.通过完全燃烧计算、雾化试验和燃烧试验,确定了溶液喷口、雾化剂(O2)喷口和氧-乙炔喷口的压力和流量的工艺参数.扫描电镜,激光测粒仪,高分辨透射电镜分析表明,用上述方法制备的纳米α-Al2O3以球形和六方棱柱为主,含极少量菱面体,颗粒尺寸为20～30nm,粒度均匀细致且分散性好.     

带常数输入率TB模型的全局稳定性

研究了各分类均具有常数输入率先的一个TB模型的全局稳定性。根据广义的Bendixson判据，证明了当输入中含有受感染者时，模型不存在无病平衡点而具有唯一的地方病平衡点。当感染者的治愈率较小时，证明了该平衡点的全局渐近稳定性。     

泡沫铝制备过程中增粘剂的选择

研究了铝熔体中添加不同种类增粘剂后的增粘效果,并通过对制备泡沫体的宏观观测和微观检测,研究了铝熔体增粘方式对泡沫体结构的影响及各种增粘剂的增粘机理. 结果表明:铝熔体中加入金属钙、镁、氧化铝和粉煤灰后,其物相组成发生改变,增粘剂存在形式和增粘机理不同,得到的泡沫体在结构上差别也很大.     

锅炉受热面管的复合涂层防护技术

针对燃煤电站锅炉受热面管磨蚀严重，导致泄露、爆管等事故而被迫停炉检修的情况，根据受热面管的形状、工况条件和使用环境状况，对电弧喷涂工艺以及对若干用于锅炉抗高温磨蚀的喷涂丝材所制备涂层的微观组织结构、硬度、涂层结合性能以及耐冲蚀磨损性能和高温腐蚀性能等进行了深入的研究。结果表明，以超音速电弧喷涂NiAl丝材作为结合底层、金属-陶瓷材料或高Cr材料作为功能层、并辅以高温封孔的复合涂层制备技术，可提高锅炉运行的可靠性和经济性。