三级生物接触氧化在高层建筑污水处理改造工程中的应用

某高层建筑已完成污水处理装置土建部分的施工，为达标排放，提出改造方案。经方案比较，将原单级接触氧化法改为三级接触氧化法，将原鼓风曝气改为潜水曝气，增加污泥外循环回流及清水池和排水泵，以强化系统脱氮效果．保证出水顺利排放。同时，介绍了各处理单元的设计参数，分析了运行费用和投资，以供同类工程参考。     

金属与金刚石薄膜接触的电学特性研究

用热丝辅助化学汽相沉积技术在Si衬底上合成了含少量受主型杂质的近于本征的金刚石薄膜，并研究了三种金属（Cu，Ag和Al）与它接触的电学特性，以及退火对接触特性的影响．结果表明Cu，Ag与金刚石薄膜接触的电学特性比较类似，而Al则明显不同；而且退火对它们的接触特性影响很大 关键词：     

Nuclear Shadowing Effect on the K Factor in Au—Au Collisions

We investigate the nuclear shadowing effect on the K factor in the Drell-Yan process by introducing a Shadowing factor into the corresponding quantum chromodynamical αs order corrections.K factors for Au-Au collisions are calculated at the centre-of-mass system energies √s=60,130 and 200 GeV while the nuclear shadowing factor is taken into account.The numerical results indicate that the nuclear shadowing factor obviously raises the K value in the small x region,and for the same nucleon the K valus becomes smaller as the energy increases.The nuclear shadowing effect could be one reason for creating the non-constancy of the K factor.     

对一个力学碰撞问题的讨论

对普通物理力学中有关碰撞的一个问题,从恢复系数e的取值角度出发,进行了详细求解和讨论,得到了更完整的结果.     

电子束产生大尺度等离子体过程的数值模拟研究

建立了一个四组分一维混合模型，对电子束注入大气产生大尺度等离子体的过程进行了数值模拟.结果表明了能量为140keV、流强为50mA/cm²的注入电子束，可以产生线度为0.5m，密度为10¹²cm^-3量级的大气环境下等离子体.电子束所伴随的空间电荷效应由于等离子体的产生会很快消失，不影响后续的等离子体产生过程.电子束注入流强主要影响产生等离子体的密度，而电子束能量则同时影响其空间线度和密度. 关键词： 电子束 碰撞 电离     

质速关系的恒力作功推导法

通过分析惯性系中的质点在恒力作用下作直线运动的事例，导出了质速关系。     

Isospin Effect of Charged Particle Multiplicity in Intermediate Energy Heavy Ion Collisions

The dependences of He and intermediate mass fragments (IMF) production rates in the reactions 55 MeV/u ^40Ar ^58,64 Ni on the isospin, impact parameter and primary excitation energy of the reaction nuclear system were studied by using the 4π charged particle multi-detector array system (MUDAL). For the mentioned two reaction systems, the measured He particle contribution in the total charged particle multiplicity increases with increasing the total charged particle multiplicity but for the contribution of IMFs in the total charged particle multiplicity increases with increasing the total charged particle multiplicity at lower total charged particle multiplicities, and latter on it drops down with further increasing of the total charged particle multiplicities (see Fig.l). The experimental results of these two reaction systems with the same nuclear charge indicate that the contribution of He and IMFs in the total charged particle multiplicities are obviously isospin dependent.     

量子点器件的三端电测量研究

利用三端电测量方法，研究了调制掺杂二维电子气结构的量子点器件输运特性.报道了可分别测量二维电子气电阻和量子点隧穿电阻的实验方法.实验结果表明：量子点的横向耦合控制了量子点器件在小偏压下的电输运特性. 关键词： 自组装量子点 二维电子气 量子隧穿 肖特基接触     

基于Hamaker假设的黏着接触弹性模型

为研究微纳米系统中的黏着接触问题，基于Hamaker假设和Lennard-Jones势能定律，通过积分方法得到了球体与平面间的黏着力，同时结合经典弹性理论建立了一种新型的球体与平面黏着接触的弹性模型，该模型可以同时得到平面轮廓随间距的变形过程及黏着力和平面变形量随间距的变化规律，当球体半径较大时，所建模型与基于Derjaguin近似的黏着模型给出的结果基本一致，随着球体半径的逐渐减小，两种模型的差异逐渐增大，这是由于Derjaguin近似的误差随球体半径的减小而增大引起的，因此，当球体的半径趋近纳米级时，基于Hamaker假设的黏着接触模型可以给出更加准确的结果。     

The production of slow particles in 16O－Em interactions at 4.5 A GeV/c

A sample of 1233 events is used to study the general characteristics of {}^{16}O－Em interactions at 4.5 A GeV/c. Multiplicity and angular distributions of slow particles and correlations among them are discussed. The present data are compared with the corresponding results from the interactions of other projectiles at the same energy and also the same projectile at different energies. The results indicate that black particle production is independent of the energy and mass of the projectile, but for grey particles it is dependent on the mass of projectile.