集成真空微电子器件的研究及展望

概述了集成真空微电子器件的基本理论、特性、工艺制备及发展现状。现在集成真空场发射阵列的发射电流密度可做到1×10~3A/cm~2,单个锥尖跨导为5.0 μS。对于锥尖密度为1×10~7锥尖/cm~2,总跨导可以达到50 S/cm~2。一种新的采用真空微电子技术的微带放大器,在频率ITHz下能输出功率1～50W。指出真空微电子技术将是设计和制备新型亚微米器件的有效方法。     

低比特率视频编码新标准H．263＋

介绍了低比特率视频编码新标准Ｈ．２６３＋。Ｈ．２６３＋是Ｈ．２６３的升级版本,增加了１２个新的编码可选模式。     

空间交会对接用激光雷达敏感器

本文讨论了在航天飞行器的空间交会对接(RVD)技术中采用激光雷达敏感器的可行性。提出在航天飞行器的自主交会对接技术中,应采用一种简单、实用的单目标系统。     

同轴送粉喷嘴粉末汇聚特性三维数值模拟

在激光金属直接制造过程中,实际的粉末汇聚不是自由射流,而是受阻射流.为了获得受阻射流工艺参数对粉末汇聚特性的影响规律,提高激光直接制造精度,应用FLUENT软件中的离散相模型模拟了工艺参数对粉末汇聚浓度分布的影响.结果表明:在自由射流时,粉末汇聚浓度随着送粉量的增加而增大,随着载气速度的增大而明显降低,保护气速度的增大...     

中医针灸临床治疗专家系统的研究与实现

中医针灸是国之瑰宝,构建中医针灸专家系统是本研究和实践的目标。在《中医针灸信息库》原系统基础上,结合穴位和疗法的有限可枚举性,提出映射样本穴位疗法为二进制串、一种改进的距离函数和一种通过阈值作为收敛标准的K-means聚类算法,为实践目标奠定基础。运用一种评估聚类算法效果设计平衡点的策略,为6万余例针灸治疗案例构建知识库。实践结果表明,该知识库能满足"依病求医"、"依医问病"和知识更新等核心应用需要,查全和查准率好,也能很好地为中医针灸治疗咨询和教学科研提供辅助决策依据。     

A study of Facebook Groups members’ knowledge sharing

There have been many studies focusing on individuals’ knowledge sharing behavior in the organizational setting. With the rapid prevalence of social networking sites, many people began to express their thoughts or share their knowledge via Facebook website. Facebook is an open environment which does not provide any immediate monetary benefits to its users. Its Groups members’ knowledge sharing behavior could be different from the ones in organizations. We proposed a research model to examine factors which promote the Facebook Groups users’ willingness to share knowledge. The factors in the study include extrinsic motivation, social and psychological forces, and social networking sharing culture. We used PLS to test our proposed hypotheses based on 271 responses collected through an online survey. Our results indicated that reputation would affect knowledge sharing attitude of Groups members and sense of self-worth would directly and indirectly (through subjective norm) affect the attitude. In addition, social networking sharing culture (fairness, identification, and openness) is the most significant factor, not only directly affecting knowledge sharing intention, but also indirectly influencing the sharing intention through subjective norm and knowledge sharing attitude.     

网络计划技术工期索赔综合分析方法

根据网络计划技术在工程进度控制中的应用,结合工程项目工期索赔的特征和对监理工程师处理工期索赔的要求,提出了基于网络计划技术的工期索赔综合分析方法以及分析中“叠加效应”和“发散效应”的处理,以利于监理工程师公平、公正地处理工期索赔,提高其监理工作质量和效能,维护业主和承包商的合法权益．并通过对某分部工程的工期索赔处理的实例分析说明网络计划技术在处理工期索赔中的作用．     

Formation of CuS pineal microspheres via a pyridine-solvothermal process

CuS pineal microspheres congregated from interleaving nanoflakes with thickness of 40 to 200 nm were synthesized by a pyridine-solvothermal process via the reaction between cupric chloride(CuCl2·2H2O) and thioacetamide(TAA,CH3CSNH2).The products were characterized by X-ray diffraction and scanning electron microscopy.UV-Vis absorption spectrum,excitation and photoluminescence spectra of CuS pineal microspheres were obtained at room temperature to investigate their optical properties.A possible growth mechanism on the formation of CuS pineal microspheres is proposed.The factors influencing the evolution of morphologies of CuS crystals including the dosage of the reactants,surfactant,and sulphur-source were also analyzed.     

基于Linux和MiniGUI的智能焊接 控制器界面设计与实现

在简要介绍MiniGUI图形用户界面系统的体系结构和特点的基础上,详细介绍了MiniGUI图形用户界面系统在ARM-Linux下的移植,以及智能焊接控制器界面的框架结构和编程实现。实际应用表明,该界面操作简单、灵活友好、提高了系统的整体性能。