亥姆霍兹线圈磁场均匀性的研究

用Mathematica研究了亥姆霍兹线圈中心区域磁场的均匀性.给出了多种区域所对应的Bx(x,y)和By(x,y)的三维分布图,从而求出了这些区域内磁场的均匀度.     

Theoretical and Experimental Study on Ground Coupled Heat Pump with Vertical Spiral Coil

Groundcoupledheatpump (GCHP)isalsoclassi callycalledthegroundsourceheatpump ,ortheearthcoupledheat pump ,orthegeothermalheat pump ,thoughtheydonotreallyutilizegeothermalenergyintheclassicalsense .Insteadofhavingitsoutsidecoilsexchangeheatwithair ,itexchangesheatwiththeearthviagroundloopheatexchanger .Itdoesnotutilizegroundwaternordoesitneedreinjectionwellsoranyprotectionagainsterosion ,sotheycanavoidextensiveuseofgroundwaterandtheearthsubsidence .Withnopollutionofwasteheat ,smoke ,andwater,i…     

杆状病毒后期启动子在大肠杆菌中启动CAT基因表达的研究

以CAT基因为报道基因,探讨了杆状病毒后期启动子在大肠杆菌中启动表达CAT基因的活性。结果显示在不含多角体基因及其启动子的质粒中,具合成启动子的表达量最高,野生型多角体启动子的表达量次之,而含ⅩⅣ多角体启动子的最低;具相同CAT基因启动子的质粒中,含多角体蛋白基因及其野生型启动子者较不含者强,含合成与ⅩⅣ启动子串联组合者与单纯ⅩⅣ启动子者表达量近乎一致,但均较前者为弱。以上结果表明,杆状病毒后期启动子在大肠杆菌与在昆虫细胞中的启动表达的能力并非完全一致。     

卷材自动包装技术在武钢的应用

钢卷包装是冷轧生产中重要的辅助工艺技术。简要介绍了自动包装技术,并以武钢冷轧总厂某分厂包装项目为例,阐述了该技术在武钢的应用状况及其效果。通过对该技术的实际应用以及应用中所存在问题的改进,使半自动包装技术更适用于实际生产作业。     

浅谈电力系统消弧线圈

从结构接线、工作原理、补偿方式及容量的选择等方面对消弧线圈进行了介绍,闸述了它在系统中应用的优点以及必要性,最后介绍了消弧圈中新技术应用.     

螺旋形线圈感应电池的专用电动机

介绍了一种无机械转换机构，把电能直接转换为机械振动的螺旋形感应电池专用电动机，提高了电机与使用工艺对象联系的可靠性，并通过分析得到数字模型．     

用相量法分析正弦稳态电路

本文通过一些实例,归纳总结了用相量法求解线圈参数的几种方法,通过这些方法的对比、总结,达到启发学生思维的教学目的。     

基于室内盘管温度比较运算的空调器智能除霜方案

在可行性实验和分析的基础上,提出一种基于室内盘管温度比较运算的智能化除霜方案。对比实验证明,该方案进入除霜的时间更为合理;除霜时间较短,效率更高;除霜干净,不会出现无霜除霜的误操作。且成本低廉,市场反映甚好。     

圆电流和亥姆霍兹线圈磁场的数值模拟

根据毕奥-萨伐尔定律和磁场叠加原理,导出圆电流和亥姆霍兹线圈的磁场分布含积分的表达式。利用Mathematica软件进行数值计算,得到磁场分布的数值解,由此绘出圆电流和亥姆霍兹线圈的磁场分布图像,并对两者的磁场均匀区进行分析比较：在垂直于中心轴线平面上亥姆霍兹线圈磁场均匀区的面积是圆电流的10.4倍;在轴平面上前者是后者的5.4倍。最后对亥姆霍兹线圈磁场均匀区（±1%）作对比分析,数值计算的结果与相关实验测量十分吻合。     

VCA Direct-Drive High Speed and Precision XY Table

In order to compensate for the limitation of conventional XY table used in semiconductor integrated circuits(IC) packaging and improve its speed and accuracy, a voice coil actuator (VCA) direct-drive high-speed and precision positioning XY table used in wire bonder was proposed. Also, a novel flexible decoupling mechanism was used in the positioning table, and the small moving mass enabled the positioning table to move at high speed and precision. XY table deformation interference caused by assembly error and instant interference generated by dynamic load moving with high speed and acceleration can be eliminated through the flexible decoupling mechanism. Considering the positioning table as lumped mass spring system,the dynamic equations of the mechanical system and the VCA were built according to the Newton mechanics principle and electromagnetic theory. Then the electromechanical coupling control model of the system was created through Laplace transform. Based on displacement PID controller, the loop-locked controlling algorithm of the positioning system was investigated. The dynamic control algorithm effectively improved the system dynamic performance. The precision test of the prototype machine was carried out, and the results validated the correctness of the model and the theory. Compared with traditional XY table, the table has higher speed, acceleration and positioning accuracy.