基于TCP/ IP 协议的CSR离子泵电源远程监控软件系统设计

This paper discuss a Ion-pump Power Supply control system making use of RS232 series bus and Intranet.The system s hardware VAC800 is composed of MSP430F149 mixed-signal processors produced by TI and UA7000A network model.MSP430F149 has advantages of ultra-low-power and high-integration.The Ion-pump Power Supply control system has the characteristics of strong function,simple structure,high reliability,strong resistance of noise,no peripheral chip,etc.Visual studio 2005 is used to design the system s softwa...中文文摘：论述了通过RS-232总线和Intranet网络,来实现对远端的离子泵电源的监测与控制。系统硬件VAC800由TI公司的MSP430F149混合信号处理器和UA7000A网络模块构成。MSP430F149具有超低功耗和高集成度等优点,利用它构建的离子泵电源监控系统功能强大,结构简单,可靠性高,抗干扰能力强。系统软件采用visual studio 2005设计。本监控系统能够很好地完成对加速器离子泵电源监视与控制。

Climatic changes in Eurasia and Africa at the last glacial maximum and mid-Holocene: reconstruction from pollen data using inverse vegetation modelling

IEECAS SKLLQG

尚未完成的地质年代表――第四纪悬而未决的前程

IEECAS SKLLQG

beta-delayed proton decays and spin assignments for Sm-133 and Yb-149

The proton-rich isotope Sm-133 was produced via the fusion evaporation reaction Ca-40 + Ru-96. Its beta-delayed proton decay was studied by p-gamma coincidence in combination with a He-jet tape transport system, and half-lives, proton energy spectra, gamma-transitions following the proton emission, as well as beta-delayed proton branching ratios to the low-lying states in the grand-daughter nucleus were determined. Comparing the observed beta-delayed proton branching ratios with statistical model calculations, the best agreement is found assuming that only one level with the spin of 3/2 in Sm-133 decays or two levels with the spins of 1/2 and 5/2 decay with similar half-lives. The configuration-constrained nuclear potential energy surfaces of Sm-133 were calculated using the Woods-Saxon-Strutinsky method, which suggests a 1/2-ground state and a 5/2(+) isomer with an excitation energy of 120 keV. Therefore, the simple(EC+beta(+)) decay scheme of Sm-133 in Eur. Phys. J.A 11,277(2001) has been revised. In addition, our previous experimental data on the beta-delayed proton decay of Yb-149 reported in Eur. Phys. J. A 12,1 ( 2 0 0 1) was also analyzed using the same method. The spin-parity of Yb-149 is suggested to be 1/2(-).

Ginsenoside R-e increases fertile and asthenozoospermic infertile human sperm motility by induction of nitric oxide synthase

We investigated the effects of Ginsenoside R-e on human sperm motility in fertile and asthenozoospermic infertile individuals in vitro and the mechanism by which the Ginsenosides play their roles. The semen samples were obtained from 10 fertile volunteers and 10 asthenozoospermic infertile patients. Spermatozoa were separated by Percoll and incubated with 0, 1, 10 or 100 mu M of Ginsenoside R-e. Total sperm motility and progressive motility were measured by computer-aided sperm analyzer (CASA). Nitric oxide synthase (NOS) activity was determined by the H-3-arginine to H-3-citrulline conversion assay, and the NOS protein was examined by the Western blot analysis. The production of sperm nitric oxide (NO) was detected using the Griess reaction. The results showed that Ginsenoside R-e significantly enhanced both fertile and infertile sperm motility, NOS activity and NO production in a concentration-dependent manner. Sodium nitroprusside (SNP, 100 nM), a NO donor, mimicked the effects of Ginsenoside R-e. And pretreatment with a NOS inhibitor N-omega-Nitro-L-arginine methyl ester (L-NAME, 100 mu M) or a NO scavenger N-Acetyl-L-cysteine (LNAC, 1 mM) completely blocked the effects of Ginsenoside R-e. Data suggested that Ginsenoside R-e is beneficial to sperm motility, and that induction of NOS to increase NO production may be involved in this benefit.

流域水土资源优化配置的几种方法比较

目前关于流域水土资源优化配置研究的特点表现为:对单项的水、土资源优化配置研究较多,把两者结合起来的研究较少;分别从宏观和微观两个尺度研究的较多,将两种尺度结合起来研究的较少;越来越重视资源配置模式下的生态系统服务功能状况及其能否满足特定区域可持续发展的需要;研究方法逐渐由定性向定量化转变,在定量研究中,较多使用一般线性规划、灰色线性规划、动态规划、多目标决策和系统动力学等方法;越来越重视以3S技术为基础,结合专业模型进行模拟,为水土资源配置和管理提供高质量的科学决策支持,但目前还没有建立完善的区域性的支持

气候变化研究中若干不确定性的认识问题

气候变化研究已取得重要进展,但很多研究结果存在不确定性。本文选择对气候变化研究有重要意义但已有的研究结果存在不确定性的几个方面进行综述,包括过去两千年气候变化的状况(中世纪暖期和小冰期是否存在、20世纪温暖程度是否为过去千年最大、20世纪增温趋势是否停止)、温室效应(对温室效应机理的不同认识、温室气体排放与气温变化的关系、水汽对温室效应及增温的贡献)、气候模式模拟(模拟与实测结果的比较、模式本身的缺陷)以及2℃阈值(来源及其物理意义、对2℃阈值的不同认识)等问题。气候系统变化的复杂性决定了人类对气候变化问

温度和pH双敏性PVME/CMCS水凝胶辐射交联制备及其性能

以聚甲基乙烯基醚(PVME)和羧甲基壳聚糖(CMCS)为原料,采用电子束辐照交联方法制备聚甲基乙烯基醚/羧甲基壳聚糖(PVME/CMCS)水凝胶,研究了温度、pH值、CMCS含量等对PVME/CMCS水凝胶溶胀度的影响,同时以5-氟尿嘧啶(5-Fu)作模型药物,初步探讨了凝胶药物释放性能

稀土-铁石榴石的共价极化行为对光谱和穆斯堡尔谱的影响

利用平均能带模型研究了稀土 铁石榴石晶体化学键的性质 ,结果表明 ,这些晶体虽然包含的稀土离子不同 ,但计算得到的化学键参数值几乎相同。在每个化合物当中 ,金属离子与氧配体之间共价性随着Ln3+ (2 4c)、Fe3+ (16a)、Fc3+ (16d)的次序而增大。利用由共价性和极化率定义的化学环境因子h计算YIG中Fe3+ 的拉卡参数与实验值一致。建立了穆斯堡尔同质异能位移与h值的线性关系 ,讨论了居里温度与h值的相关性。