氦原子与HD,HT,DT分子碰撞角分布的理论计算

采用Ｔａｎｇ－Ｔｏｅｎｎｉｅｓ势模型,通过坐标变换,得到了氦原子与氢分子的非对称同位素替代体系ＨＤ,ＨＴ,ＤＴ在质心坐标系中的势能函数,在此基础上计算了Ｈｅ－ＨＤ,ＨＴ,ＤＴ碰的角分布。     

18O+148Nd的准弹性碰撞研究和耦合道分析

用Q3D磁谱仪及其焦面探测器系统,在90.72MeV处测量了¹⁸O+¹⁴⁸Nd的弹性散射和非弹性散射角分布,利用DWBA和耦合反应道计算程序FRESCO,对实验结果进行了拟合.在对弹性散射分析中,引入极化势的DWBA计算与耦合道计算有类似的结果.讨论了非弹性散射激发过程中的核–库仑激发的相干效应,得出了描述相干强度的近似因子.     

A Microcomputer System for Automatic Mode Sweep of Ring Laser Angular Rate Sensor (Ring Laser Gyro)

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High Speed Demultiplexer Based on a Three-Wavelength SLA

By using a semiconductor laser amplifier (SLA) with a three-wavelength configuration, which works as a nonlinear element in an optical loop mirror, a demultiplexer device for ultra-fast processing is presented. The simulation shows that its switching time can be less than 10 ps at the holding beam power of 1 W, therefore it has the ability of demultiplexing one bit data from 100 Gb/s Optical Time Division Multiplexing (OTDM) pulse trains at the control power of 1 W.     

Numerical simulation of a 4WD–4WS tractor turning in a rice field

For the steady-state circular turning of a 4WD–4WS (4 wheel driven–4 wheel steered) tractor in a rice field, a numerical simulation was achieved. Equations of motion of this tractor were developed in a vehicle fixed x–y coordinate system. By comparing the calculated and measured results of acting forces on the tractor tires, this simulation was evaluated. Then, the characteristic parameters of the turning vehicle, which are the side slip angle and the yaw angular velocity of the vehicle center of gravity, were simulated in several combinations of the steering wheel angle and the forward speed. Also the same simulation applied to a 4WD–2WS tractor which had the same body as the 4WD–4WS tractor. The simulated results showed a clear difference of turnability between 4WS and 2WS. ©     

基于双层超表面的宽带、高效透射型轨道角动量发生器

提出一种宽带、高传输效率的双层超表面,其单元结构是在介质层两边对称刻蚀结构参数相同的十字型金属贴片且将两层超表面沿y方向错位半个周期长度形成.通过引入y方向的错位,双层超表面的透射带宽得到大幅度提升.同时,采用等效电路理论分析了该双层超表面的带宽展宽机理.在此基础上,进一步结合Pancharatnam-Berry相位原...     

舰载角速度匹配传递对准方法研究

为了提高舰载局部捷联惯导系统的导航精度，希望能够在传递对准过程中，对船体甲板变形进行估计，对惯性器件的某些误差进行标定，并进行补偿。作为参数匹配传递对准方法之一的角速度匹配法为此提供了可能。文中对角速度匹配法中的三种不同海况下的系统状态可观测性进行了详细的分析，并对船体甲板变形和陀螺漂移进行了Kalman滤波估计及精度分析。研究结果表明，这一方法具有较好的对准精度和快速性，但具体情况随船体的运动情况而不同。     

稀土核区三轴超形变全同带

系统地考察了稀土核区三轴超形变带的跃迁能量、角动量增量顺排和动力学转动惯量.研究表明这些三轴超形变带为全同带.     

推转PNC波函数的角动量投影

研究原子核较高自旋态的特征,不仅需要考虑K混合,而且应该引入Coriolis相互作用项,亦即使用推转Hamilton量.推转项的引入破坏了时间反演对称性,单粒子角动量在内禀对称轴上的投影量子数已不再是好量子数.从表面上看,这会使得理论计算变得非常复杂,但考虑到原子核的某些固有对称性,将角动量投影技术应用于含推转成份的粒子数守恒波函数(推转PNC波函数)并不十分困难.在这一理论框架下详细推导计算原子核能谱及电磁性质的基本表达式,从而表明实施该方案的可行性.     

Positron–neutrino correlations in 32Ar and 33Ar decays: Probes of scalar weak currents and nuclear isospin mixing

The positron–neutrino correlation in the 0⁺→0⁺ β-decay of ³²Ar was measured at ISOLDE by analyzing the effect of lepton recoil on the shape of the narrow proton group following the super-allowed decay. Our result is consistent with the standard model prediction;for vanishing Fierz interference we find a=0.9989±0.0052±0.0039. Our result leads to improved constraints on scalar weak interactions. The positron–neutrino correlation in ³³Ar decay was measured in the same experiment;for vanishing Fierz interference we find a=0.944±0.002±0.003. The ³²Ar and ³³Ar correlations, in combination with precision measurements of the half-lives, super-allowed branching ratios and beta endpoint energies, will determine the isospin impurities of the super-allowed transitions. These will provide useful tests of isospin-violation corrections used in deducing |V_ud| which currently indicates non-unitarity of the KM matrix. This revised version was published online in July 2006 with corrections to the Cover Date.