有限域上的不可约多项式

通过有限域上的低次本原多项式构造出了同一有限域上的高次不可约多项式。为进而构造有限域上的高阶本原多项式创造了条件。     

空气雾化钻井中液滴尺寸及其分布

本文讨论了空气雾化钻井中液滴大小的计算方法，分析了影响液滴尺寸的因素．发现液相和气相的相对速度、液体的表面张力以及气体中液相的体积百分数是影响液滴尺寸的主要因素．     

水压裂缝缝内流场的理论研究

水力压裂过程就是地层在受到压裂液作用后裂缝向前延伸扩展的过程。水力压裂过程中，缝内流体的流动特征对裂缝的延伸和形态具有很大的影响。要确定水力压裂过程中的缝宽变化，首先应根据流体力学理论，找出缝内流体压力的分布规律，得出它与裂缝宽度的关系，再根据岩石力学和断裂力学理论，寻求二在裂缝宽度或压力方向的流固耦合，从而科确定出裂缝的几何形态。通过缝内流场的理论研究，推导出了一个新的描述缝内流场的理论模型，为求解全三维裂缝几何形态打下了理论基础。     

高压交流架空线路工频电场对人体的影响

本文主要讨论了高压交流架空线路下人体对地感应电位和人体接触电流的算法.文中首先把人体简化等效为一个等值圆柱,用等效电荷法导出了单相架空线路下人体对地电位的计算模型.在此基础上,进一步将模型与算法推广到三相高压交流架空线路的情况.然后本文运用所推出的模型与算法计算出人接触架空线路下的导体时通过人体的电流.本文推出的模型与...     

Synthesis and characterization of indium tin oxide (ITO) nanoparticle using gas evaporation process

In this paper, indium tin oxide (ITO) nanoparticle was synthesized by gas evaporation process, and its physical properties such as particle size, specific surface area, crystal structure, and composition ratio according to the heat-treating conditions were investigated to optimize them. The source material was charged in a chamber with vacuum circumstance of 1×10⁻⁵ torr, and the oxygen gas was supplied during evaporation. The In_xO_ySnO_z nanoparticle was synthesized, and the nanoparticle was heat-treated to have optimal point of particle size, crystal structure, and composition, etc. The synthesized nanoparticle was heat-treated with controlling such parameters as heat-treating temperature and environmental gas. Particle size, specific surface area, crystal structure, and concentration ratio of the synthesized ITO nanoparticle by using the method were analyzed with high resolution transmission electron microscopy (HRTEM), BET surface area analyzer, X-ray diffraction (XRD), and energy dispersion spectroscopy (EDS). As a result, in case of ITO nanoparticle synthesized at 300^∘C, its mean particle size is 5 nm and the surface area exceeds 100 m²/g. The XRD analysis indicates that the crystal structure of the particle is cubic one with orientation of (222), (400), (440). Also, the EDS analysis demonstrates that the concentration ratio of indium and tin is 91 at% and 9 at% in the lattice of the ITO nanoparticle. Since the lower sized ITO nanoparticle produces the ITO sputtering target with higher density and the ITO sputtering target with higher density makes the high quality ITO electrode, the synthetic condition of 300^∘C is considered to be optimal condition for enhancing the high quality ITO electrode.     

应用模态级数方法分析电力系统模态谐振

本文推出了一种分析电力系统模态谐振的方法———模态级数(modalseries)方法。用该方法求取2阶解析解不用解高维非线性代数方程,而且把谐振情况和非谐振情况的公式融为一体,推导容易,计算简单。在2阶解析解的基础上推导出了系统谐振时非线性相关因子的表达式。用该方法分析了简单电力系统中出现的模态谐振情况,获得了良好的效果,由此验证了本文所提出方法及谐振时2阶非线性相关因子的正确性。     

输配电网利用水平的宏观分析方法及日本案例研究

通过分析一个国家或地区的电力宏观统计数据,能够一定程度揭示其输配电网利用水平的历史发展规律及其与全社会电力需求增长之间的关系。提出了一组反映输配电网整体利用率的利用水平指标以及该指标的近似估算方法和一组反映输配电网发展速度与用电需求增长速度之间相对关系的发展弹性系数指标。为验证所提两组指标的实用性,分析了日本1963—2011年电力工业发展数据,绘制了历史曲线图,从利用水平的角度研究了日本输配电网的发展规律。算例分析结果表明,在特定阶段日本电网建设超前于经济发展,不同电压等级电网利用水平发展趋势有较大差别,电网利用水平受经济发展水平和经济波动影响明显。     

脉冲电磁场对雄性小白鼠生物效应的研究

本文分析了生物体所处电磁环境的类型以及外电磁场对生物体的作用方式，并以雄性小白鼠为研究对象.采用血细胞计数及细胞电泳实验的方法研究了脉冲电场及脉冲磁场对其影响。在生物电介质介电模型的基础上，探讨了脉冲电磁场对生物体及其细胞作用的机理。     

变压器油中溶解气体在线监测技术的研究

介绍了一种可分别检测C0和H2两种气体含量的智能型的在线监测装置,概述了脱气技术及气体含量测量技术的研究.     

Deposition and gas sensing properties of tin oxide thin films by inductively coupled plasma chemical vapor deposition

Tin oxide thin films have been deposited by a custom-designed inductively coupled plasma chemical vapor deposition (ICP-CVD) system in order to explore its application as an alternative approach for thin film gas sensor preparation. The as-deposited SnO₂ films were of polycrystalline structure with nano-size grains of 12 nm. The SnO₂ films exhibited a maximum sensitivity of 43 to 1000 ppm H₂ at an optimum operating temperature of 350^∘C. The response time of the SnO₂ films was 12 s and full recovery was achievable.