石菖蒲净化富营养化水体的研究

在石菖蒲克藻研究的基础上,在室内进行模拟试验,从青山湖排污口取污水置于培养缸中,培养石菖蒲。在培养前后定期进行水质成分分析,测试氯化物,有机耗氧量（ＣＯＤ）、生化需氧量（ＢＯＤ５）,溶解氧（ＤＯ）,铵氮和总磷的变化,植株总氮,总磷的变化,再分析石菖蒲对污水的净化效果,发现氯化物、ＣＯＤ、ＢＯＤ５和铵氮呈下降趋势,幅度均较大;ＤＯ则呈上升趋势,通过本试验发现水体总氮去除率达８７．４％,总磷去除率达４     

发铅含量与维生素D缺乏性佝偻病关系的探讨

探讨了铅与维生素Ｄ缺乏性佝偻病的关系。采用示波极谱法同时检测维生素Ｄ缺乏性佝偻病患儿１１８例及健康儿７６例发铅浓度。结果表明,维生素Ｄ缺乏性佝偻病患儿发铅浓度高于健康儿,且婴儿组中度佝偻病发铅浓度高于轻度佝偻病患儿,提示发铅浓度与佝偻病有一定的关系,高铅参与了营养性维生素Ｄ缺乏性佝偻病的发病机制,预防铅吸入可减少维生素Ｄ缺乏性佝偻病的发生。     

p型掺杂1.3μm InAs/GaAs量子点激光器的最大模式增益特性的研究

对p型掺杂13 μm InAs/GaAs量子点激光器的最大模式增益进行了实验和理论分析.实验上,测量了不同腔长激光器阈值电流密度与总损耗的对应关系,拟合出的最大模式增益为175 cm^-1,与相同结构非掺杂量子点激光器的最大模式增益一致.同时理论分析表明,p型掺杂对InAs/GaAs量子点激光器的最大模式增益并无影响,并且最大模式增益的计算结果与实验值相符.具有较小高度或高宽比的量子点能达到更高的最大模式增益,而较高的最大模式增益对p型掺杂13 μm InAs/GaAs自组织量子点激光器在光通信系统中的应用具有重要意义. 关键词： 最大模式增益 p型掺杂 InAs/GaAs量子点激光器     

光纤陀螺启动过程标度因数补偿方法

针对光纤陀螺启动过程标度因数变化大、稳定时间长的问题,提出标度因数补偿方案。分析了光纤陀螺启动过程中标度因数误差及超辐射发光二极管平均波长随温度变化误差产生的物理机制,建立了启动过程中标度因数误差的数学模型。进一步提出了一种通过测量温控电桥电路THERMIN端电压实时补偿启动过程标度因数的方案。试验结果表明,启动过程中(2 s内)光纤陀螺标度因数误差峰峰值从约25 000×10~(-6)降低到小于300×10~(-6),大幅提高了启动过程标度因数性能,满足了武器系统的快速启动需求。     

Stripping extraction calculation and simulation for CYCIAE-100

A 100 MeV H- compact cyclotron is under construction at China Institute of Atomic Energy (CYCIAE-100). The proton beams of 75 MeV-100 MeV at an intensity of 200 μA will be extracted in dual opposite directions by charge exchange stripping devices. The crossing point at the switching magnet center is fixed inside the magnet yoke and the stripping points for various extraction energies are calculated by the code CYCTRS. With the code GOBLIN, we can calculate the transfer matrix including the dispersion effects from the stripping point to the switch magnet. The beam distribution just after stripping foil can be obtained from the multi-particle tracking code COMA and the extracted beam parameters after the switch magnet such as emittance, envelope, dispersion, energy spread, bunch length, etc. are given by the extraction orbit simulations.     

Influence of radial magnetic field on emittance in the median plane at CYCIAE-100

A 75—100 MeV H- compact cyclotron CYCIAE-100 is being constructed at China Institute of Atomic Energy (CIAE). About 200 μA proton beam will be provided by CYCIAE-100. The imperfection of magnetic fields will remarkably affect the acceleration orbit and beam envelope in CYCIAE-100. The effects to the accelerating beam by the imperfection fields, especially the field components B_r on the mid-plane will be analyzed in detail with tracking code COMA. Poles misalignment that causes magnetic imperfection will be described in the paper. According to the simulation results, the tolerance of the poles machining and assembly will be illustrated in this paper.     

冷凝器动态性能仿真研究

本文应用移动边界法(MB)对冷凝器建立了动态仿真数学模型,模型体现了冷凝器内各个相区长度随时间的变化,模型最终可以化为常微分线性方程组的形式,在求解上更为方便且兼顾了仿真的效率和精度,模型可提供冷凝器详细的性能参数;研究了在系统不同的控制参数阶跃情况下冷凝器的动态响应,获得了冷凝器的动态特性,冷凝器的动态特性是冷凝器动态优化设计和编制系统控制规律的基础。本文中的冷凝器建模方法适合于系统级仿真研究。     

MS-代数的理想和同余关系

给出了MS-代数L的理想I=(d]可以成为某个同余关系核的充要条件;分别给出了以L的理想I=(d]为核的最小同余关系及最大同余关系的充要条件．     

A new three-dimensional chaotic system and its modified generalized projective synchronization

Based on the Chen chaotic system,this paper constructs a new three-dimensional chaotic system with higher order nonlinear term and studies the basic dynamic behaviours of the system. The modified generalized projective synchronization has been observed in the coupled new three-dimensional chaotic system with unknown parameters. Furthermore,based on Lyapunov stability theory,it obtains the control laws and adaptive laws of parameters to make modified generalized projective synchronization of the coupled new three-dimensional chaotic systems. Numerical simulation results are presented to illustrate the effectiveness of this method.     

Describing spatiotemporal couplings in ultrashort pulses using coupling coefficients

Three coupling coefficients are defined to describe spatiotemporal coupling in ultrashort pulses. With these coupling coefficients, the first-order spatiotemporal couplings of Gaussian pulse and beam are described analytically. Also, the first-order and the second-order spatiotemporal couplings caused by angular dispersion elements are studied using these coupling coefficients. It can be shown that these coupling coefficients are dimensionless and normalized, and readily indicate the severity of spatiotemporal coupling.