基于布尔求差的对数螺旋锥齿轮精确建模

为了获得新型螺旋锥齿轮——对数螺旋锥齿轮的小齿轮的精确三维模型,提出一种新的建模方法,即基于对数螺旋锥齿轮的形成机理,建立精确的等螺旋角圆锥对数螺旋线,并作为对数螺旋锥齿轮的齿向线.对数螺旋锥齿轮大小两端的齿廓线采用精确渐开线及圆弧过渡,通过沿引导线精确扫掠的方式建立第一个齿槽.对齿槽进行阵列,用面锥与齿槽进行布尔求差的方式实现对数螺旋锥齿轮三维模型的精确建模,建模理论误差为零,实际距离误差≤0.1μm.以齿数为9,模数为4.5mm,压力角为20°,螺旋角为35°的对数螺旋锥齿轮小齿轮为例进行建模,在德玛吉DMU 40五轴联动铣床进行数控加工,证明方法的有效性和实用性.     

调整圆柱齿轮滚齿刀安装角度的直观图示修订

几乎所有书籍中介绍滚齿刀的安装角度的调整,仅介绍了调整的原理及已调整好的滚齿刀的状态,对滚齿刀的安装角度的具体调整不够明确.作者从实践工作中总结出了一套浓齿刀安装调整的方法,以供机床操作人员、工艺技术人员参考.     

一类空间曲线与平面交点的快速算法

针对一特定类型的空间曲线－伪凸螺旋线，充分利用直线的单调性，选择恰当的起始值，运用牛顿切线法，给出一种可以快速求出这类曲线与平面的所有交叉的算法，其中螺旋线的位置与平面的位置可任意（任意位置和任意方向）。     

计及核自旋时原子的Lande‘g因子表达式

本文用矢量模型方法推导出了考虑核自旋的原子Ｌａｎｄｅ‘ｇ因子公式。结果表明此公式可作为文献（１）中给出的ｇ因子通式推广。     

The Microscopic Approach of sdglBM-1 and Its Application to Nucleus ^154Gd

Based on the Dyson expansion theory, a micro-scopic approach of sdglBM-1 is presented and applied to nucleus is, Gd in this paper. The energy spectra and E2 transition have been calculated. Good agreement is obtained in comparison with experimental results.     

关于原子核形变问题的再讨论

原子核是什么形状的？它为什么会发生形变？本将通过核结构模型来讨论原子核的形变问题（指由球形核变为非球形核），并把它与普通物理学中某一力学习题所得出的结论进行比较，从而使我们能够更形象、更深刻地理解原子核的形变。     

对卢瑟福散射的研究

汤姆逊模型不足以说明a粒子散射实验中的大角散射,而a粒子的大角散射实验却充分证明了原子的核式结构 (即:卢瑟福模型).现利用正弦函数的值域和从微观的角度来分析卢瑟福模型可能发生大角散射的原因.     

A spiral-tube-type valveless piezoelectric pump with gyroscopic effect

Abstract The valveless piezoelectric pump integrates driving and transmitting into one operating element, and characterizes easy micro-miniaturization. But, there is the original sin of low pressure and low flow. Thus, it must avoid weakness to choose applications field. This paper analyzes the flow characteristics in the rotary spiral-tube, which will cause the Coriolis force, and subsequently influence the fluid moving. The principle of the pump is deduced, and the spiral-tube-type valveless piezoelectric pump is invented. The angular velocity variation can be obtained when the pump attitude changes, which theoreti- cally verifies the gyroscopic effect of the pump. A pump is fabricated for experimental testing. Experiments has shown that when Archimedes spiral 0 = 4n is selected for the tube design, and the rotation speed of the plate is 70 r/min, the pressure differential is 9 mm H20, which is 1.5 times that of 0 r/min rotation speed. If introduced the low-cost and miniaturized gyroscope, then this may promise potential application in these areas such as smart cars, robots, and home health care.     

浅谈AutoCAD教学中绘制三维螺旋线型图形的方法

本文简要论述低版本的AutoCAD软件绘制三维螺旋线型图形时自建模的过程和方式．方法,并通过实例详细介绍了用AutoCAD2007绘制三维螺旋线型图形的步骤,方法和要点。     

Recent progress in theoretical nuclear physics related to large-scale scientific facilities

Several large-scale scientific facilities(LSSF) are running and several others are under construction in China.Recent progress made by Chinese scientists in theoretical study of nuclear physics related to these facilities is reviewed.The emphasis is put on those topics covered in the issue entitled Special Topics on Some Theoretical Nuclear Physics Aspects Related to Large-scale Scientific Facilities(in Sci China Ser G-Phys Mech Astron,Vol.52,No.10,2009).