Theoretical Maxwelrs Equations, Gauge Field and Their Universality Based on One Conservation Law

The notion of the inner product of vectors is extended to tensors of different orders, which may replace the vector product usually. The essences of the differential and the codiffcrential forms are pointed out： they represent the tangent surface and the normal surface fluxes of a tensor, reslpetivcly. The definitions of the divergence and the curl of a 2D surface flux of a tensor arc obtained. Maxwell＇s equations, namely, the constraction law of field, which were usually established based on two conservation laws of electric charge and imaginary magnetic charge, are derived by the author only by using one conservation law （ mass or fluid flux quantity and so on） and the feature of central field （or its composition）. By the feature of central field （or its composition）, the curl of 2D flux is zero. Both universality of gauge field and the difficulty of magnetic monopole theory （ a magnetic monopole has no effect on electric current just like a couple hasing no effect on the sum of forces） axe presented： magnetic monopole has no the feature of magnet. Finally it is pointed out that the base of relation of mass and energy is already involved in Maxwell＇s equations.     

浅谈摩托车发动机装配中的螺丝连接

摩托车发动机是由若干部件和零件按照规定的技术要求组合而成的。在发动机的构造中，曲轴连杆活塞和配气机构、变挡机构、离合器等零部件与曲轴箱、汽缸体、汽缸盖等铸铝件，通过螺纹有序地连接在一起，并且根据各部分零件的材料、功能、受力程度和密封要求，规定了不同的扭矩和轴向力。由于我国摩托车市场起步较晚，     

用WKB法的近似解作为精确解求微分方程

用ＷＫＢ近似方法解薛定谔方程，得到的解是近似的，本文提出一种用该近似解作为精确解求微分方程的方法，求得该微分方各国分析解的近似条件及解的近似程度等问题。     

浅谈“南二环铁路新村人行天桥”施工经验

人行天桥钢板焊接箱形连续刚构梁桥结构断面小，尺寸要求严格，施工偏差只允许几毫米，因此，施工测量，墩柱在灌注砼过程中如何保持其定位，钢梁在架设过程中如何保证桥梁中心线及桥面高度等问题都须认真对待，本文介绍了这方面的施工经验。     

基于非量测数字相机的近景摄影测量

介绍了应用基于非量测数字相机的近景摄影测量方法进行建筑物外形的测量，通过直接线性变换（DLT）计算未知点的空间三维坐标，并探讨了数字影像畸变改正对解算结果的影响，应用此方法很好地解决了人体骨架模型的测量。