消磁电源误差信号采集与处理方法

为了解决传统仪器在消磁设备误差检测中存在着测试周期长,精度偏低,自动化程度不高等问题,结合消磁电源模块误差的来源和消磁电源模块的特性,研究了消磁电源模块静态特性、动态特性、瞬态特性的测试方法.同时对系统的自校正技术原理和算法进行了研究,提出了基于最小二乘法和实用滤波法的三段式的数据校准方法来消除系统误差,设计了差分放大电路来抑制零漂现象;基于虚拟仪器技术和Labview平台,根据所提出的测试方法和分析方法,成功实现了消磁电源模块误差测试系统.     

北京国际花卉物流港叶状钢屋盖施工技术

北京国际花卉物流港叶状钢屋盖采用的施工方法有效解决了大跨度管桁架安装的技术难题,保证了工程的施工质量并提高施工速度,降低了施工成本。课题的研究内容主要针对叶状钢结构屋盖施工方法的研究,其成果在今后的空间管桁架施工中有广阔的推广应用前景。     

生活垃圾卫生填埋场封场工程施工技术

封场施工通过对填埋库区堆体表面进行覆土、铺设防渗材料等防渗处理、地表水导流、填埋气体导排、渗沥液有序收集和场区绿化等施工,选用陈垃圾、现况坡面土或粘土作填筑材料,经过机械作业、人工配合修整及压实处理后,形成表面平整、密实、稳定的坡面,降低了滑坡塌方的概率,提高了垃圾堆体安全性,实现了控制气体无序排放、沼气收集利用、封闭臭气和渗沥液、抑制病菌及其传播媒体蚊蝇的繁殖和扩散,最终实现了绿化美化环境的目标。     

强纵向磁场下圆柱型量子阱中的集体激发和态密度的抹灭(英文)

On the basis of a cylindrical quantum well model, a self-consistent theory of tunneling perimeter-magnetoplasmon (TPMP) in a ring superlat-tice is proposed. A new TPMP branch is found as a result of the electron tunneling in the superlattice direction. Lntrasubband excitation with angular quantum numbers is studied in a tight-binding approximation. Moreover, in the presence of a strong longitudinal magnetic field, we have found that the electric quantizations caused by the lateral confinements may be destroyed by the strong magnetic field and when the applied field is larger than a critical magnetic field the quantized energy levels associated with the radial quantum numbers(n = 2,3,…) are completely smeared out, except the first radial quantized energy level associated with n = l. Using the results obtained, we have explained an unexpected experimental phenomenon related to the damping of oscillations of DOS in a quasi-one dimensional wire under a strong longitudinal magnetic field.