Outline Imaging by THz Time Domain Spectroscopy

Outline imaging by THz time domain spectroscopy is proposed. Spectroscopic splitting at interface is reported, The principle of outline imaging is put forward. Experimental results demonstrate the feasibility of outline imaging by spectroscopic splitting, It is shown that clear out：line image of sample interface could be achieved easily by this technique. The spatial resolution is about 0.6mm. The THz-beam focus, the scanning step and the THz pulse width are the critical foctors affecting the imaging resolution. The signal-to-noise ratio of this technique could be improved greatly compared to the conventional transsion imaging.     

EFV方法的可行性验证

本文在已有的EFV方法基本思想和数值运算的基础上,对1s0d壳的F¹⁸,N²⁰,NeF²²和SiF²⁸四种核的不同态进行了实际运算,验证了EFV方法的可行性,说明了该方法中所包括的各种关联作用的重要性.为大模型空间中EFV方法的应用铺平了道路.     

D—^3He聚变动力可行性研究

本文首先简要地讨论D-3He聚变的物理要求并与D-T聚变作相应的比较,然后运用目前的约束定律和第一稳定区β极限,对计划的近期ETR规模装置(如CIT,TIBER,FER,NET)进行D-3He得失相当和点火实验的可行性研究,并对高径比第二稳定区D-3He托卡马克堆进行参数学研究,最后指出潜在的缩短商用化进程可能性。     

Non-Achievability of Metal-Insulator Transition in Two-Dimensional Systems

We present a simple demonstration of the nonfeasibility of metal-insulator transition in an exactly two-dimensional （2D） system. The Hartree-Fock potential in the 3D system is suitably modified and presented for the 2D case. The many body effects are included in the screening function, and binding energies of a donor are obtained as a function of impurity concentration so as to find out the possible way leading metal-insulator transition in the 2D system. While solving for the binding energy for a shallow donor in an isolated well of a GaAs/Ga1-x Als As superlattice system within the effective mass approximation, it leads to unphysical results for higher concentrations. It shows that the phase transition, the bound electron entering into the conduction band whereby （H）min=0, is not possible beyond this concentration. The results suggest thai a phase transition is impossible in 213 systems, supporting the scaling theory of localization. The results are compared with the existing data available and discussed in the light of existing literature.     

EDA软件在大学物理电学实验课中的应用

分析了EDA软件进入大学物理电学实验课堂的可行性和必要性，并给出了一些应用实例。     

“追寻守恒量”教学设计

根据新课程的相关理念设计了一个"追寻守恒量"教学设计.     

磁化套筒惯性聚变初步探索研究与实验可行性分析北大核心CSCD

磁化套筒惯性聚变(MagLIF)构型可充分利用现有大型脉冲功率驱动装置,如聚龙一号等。基于磁流体力学方程组和1∶1比例氘氚(DT)混合燃料聚变模型,开发了零维MagLIF数值模拟程序并进行了初步探索研究。计算结果表明初始负载参数(如轴向磁场强度,预加热温度、时刻,负载半径等)与聚变产额之间有着密切的联系,在给定条件下,可依据计算给出的定性关系进行负载优化设计。值得注意的是,根据计算结果,即使在理想条件下,氘氚燃料要实现能量收支平衡,则驱动器的电流必须大于21.2 MA。这意味着聚龙一号装置(10 MA)无法开展集成化的MagLIF实验,进一步的校验计算验证了上述观点,并在此基础上提出铝套筒分解实验的建议和负载设计参数。所取得的计算结果有利于加深对MagLIF套筒压缩阶段物理过程的认知和理解。     

磷钼杂多化合物脱硫热力学可行性与硫磺生成机理研究

长期以来杂多化合物一直被用作特定反应的催化剂 ,尚无直接利用其氧化还原性能进行污染物治理研究的先例 [1] .由于磷和钼在我国均为丰产元素 ,相应的杂多化合物又具有稳定的化学性能 ,寻找其新的应用领域无疑具有特别重要的意义 .本文对与此相关的脱硫热力学可行性与硫磺生成机理问题进行研究 ,以期为应用开发奠定理论基础 .1　实验部分1 .1　仪器和试剂　 31 4型硫离子选择电极 (江苏电分析仪器厂 ) ;DSC- 7型微分量热仪 (美国 Perkin-Elmer公司 ) ;Finber 1 0 0 0型能谱分析仪 (配置 Pioneer KYKY2 80 0型扫描电镜 ) ;UJ33a型电位…     

膜蒸馏装置热容腔流场数值模拟的可行性分析

本文运用CFD软件,采用水作为工质,在第Ⅲ代膜组件基础上,对旋转切向入流空气隙膜蒸馏热容腔内的流场进行了模拟计算,通过数值模拟结果与实验数据的比较分析,验证了针对膜组件热容腔进行理论模拟所设置的物理模型和边界条件是符合实际的,理论模拟值和实验值的误差在20%范围内,其结果较为理想.