对氟苯丙氨酸对约氏疟原虫超微结构的研究

对氟苯丙氨酸（４－Ｆｌｕｏｒｏ－ＤＬ－β－Ｐｈｅｎｙｌａｌａｎｉｎｅ）通常被认为是苯丙氨酸的竞争抑制剂。它对恶性疟原虫的生长有明显的抑制作用。在１…１０＾－３ｍｏｌ／Ｌ的用药浓度下，可以有效地损伤约氏原虫（Ｐｌａｓｍｏｄｉｕｍ ｙｏｅｌｉｉ）使之在形态结构上出现一系列的变化。主要是膜结构的损伤，此外还有空囊泡的出现和疟色素的变型、凝集。     

Design and simulations for the detector based on DSSSD

The present paper describes the design and simulation results of a position-sensitive charged particle detector based on the Double Sided Silicon Strip Detector （DSSSD）. Also, the characteristics of the DSSSD and its testing result were are discussed. With the application of the DSSSD, the position-sensitive charged particle detector can not only give particle flux and energy spectra information and identify different types of charged particles, but also measure the location and angle of incident particles. As the detector can make multi-parameter measurements of charged particles, it is widely used in space detection and exploration missions, such as charged particle detection related to earthquakes, space environment monitoring and solar activity inspection.     

专科层次男、女生心理状况性别差异的调查分析

大学生的心理健康教育已受到教育界、社会的普遍重视.作为大学生中的专科生群体,尤其值得我们关注.本研究从分析专科男、女生的学习、生活、未来目标等差异状况着手,寻求其中带有共性的心理问题,以供教师运用有针对性的教育方式,引导专科学生健全人格和提高社会适应能力.     

PuH分子的势能函数与垂直电离势的理论计算

用密度泛函B3LYP方法计算得到PuH分子基态X^8∑^-,PuH^ 分子离子基态X^7∑^-和PuH^2 分子离子基态X^8∑^-的势能函数、力常数与光谱数据，并算出PuH分子的垂直电离势。     

Comparative studies of silicon photomultipliers and traditional vacuum photomultiplier tubes

Silicon photomultipliers (SiPMs) are a new generation of semiconductor-based photon counting devices with the merits of low weight, low power consumption and low voltage operation, promising to meet the needs of space particle physics experiments. In this paper, comparative studies of SiPMs and traditional vacuum photomultiplier tubes (PMTs) have been performed regarding the basic properties of dark currents, dark counts and excess noise factors. The intrinsic optical crosstalk effect of SiPMs was evaluated.     

Design and performance study of the LEPD silicon tracker onboard the CSES satellite

The low energy particle detector (LEPD) is one of the main payloads onboard the China seismic electromagnetic satellite (CSES). The detector is designed to ascertain space electrons (0.1-10 MeV) and protons (2-50 MeV). It has the capability of identifying the electrons and protons, to measure the energy spectrum and the incident angle of the particles. The LEPD is made up of a silicon tracker system, a CsI (Tl) mini-calorimeter, an anti-coincidence system made by plastic scintillator, as well as electronics and a data acquisition system (DAQ). The tracker is also a kind of E-E telescope; it consists of two layers of double-sided silicon strip detectors (DSSD). The signals emerging from the silicon tracker can be read out by two pieces of application specific integrated circuit (ASIC), which also can generate an event trigger for the LEPD. The functions of the DSSD system in the LEPD for charged particles were tested by 241Am @5.486 MeV α particles. The results show that the DSSD system works well, and has high performance to detect charged particles and measure the position of incident particles.     

A geometric factor calculation method based on the isotropic flux assumption

One of the instruments onboard the China Seismic Electromagnetic Satellite （CSES） is the Low Energy Particle Detector （LEPD）. The primary objective of LEPD is to provide measurements of the fluxes, energy spectra and pitch angles of 100 keV to 10 MeV electrons and protons from 2 to 50 MeV in the Earth＇s magnetosphere. The geometric factor is one of the principle parameters of a detector, which converts the physical quantity-count rate to the particle quantity-flux. In this paper, we calculated the geometric factor of LEPD via computer modeling of an isotropic radiation environment. It was first demonstrated that the radiation intensity related should obey a cosine-law, then a general sampling method of generating this distribution via GPS of GEANT4 was explained. Furthermore, combined with flux normalization, a comparison of the geometric factor calculation of a set of 2-layer detectors with different shapes （cylinder, truncated cone and rectangle） was performed. Results show a generally good agreement between simulation and analytical calculations for the cylinder and truncated cone detectors, and the result of the rectangular one, for which there is no accurate analytical formula, is consistent with the previous simulated results by others. As a practical instance of the 2-layer rectangle detector, the geometric factor of LEPD is 10.336±0.036 m cm2·sr for 10 MeV proton and 8.211±0.032 m cm2·sr for 8 MeV electron.     

Nonergodic Brownian Motion

The long-time behavior of a system is suggested to confirm nonergodicity of non-Markovian Brownian dynamics, namely, whether the stationary probability density function （PDF） of the system characterized mainly by low moments of variables depends on the initial preparation. Thus we classify nonergodic Brownian motion into two classes： the class-I is that the PDF of a force-free particle depends on the initial velocity and the equilibration can be recovered through a bounded potential; while the PDF in the class-H depends on the initial coordinate and the equilibration can not be approached by introducing any potential. We also compare our result with the conditions of three kinds for ergodicity.     

羊八井ARGO实验RPC性能

羊八井ARGO实验采用全覆盖式RPC阵列探测小型空气簇射事例,本文报告了在羊八井高海拔条件下RPC的工作性能,包括电流、效率、读出条重数和时间分辨随高压的变化.通过在气体中添加SF6组分和调节接收系统下拉阈值可以有效遏制由于探测器地浮动引起的伴随多重数.