碳化硅中惰性气体离子辐照引起缺陷的研究

综述了有关碳化硅材料中惰性气体离子引起辐照缺陷研究的进展。包括借助多种方法对氦离子辐照的碳化硅中氦泡集团形成的剂量阈值的实验研究,基于过冷固体假设对氦泡阈值的理论解释,不同剂量氦泡的两种形态及其机理的研究,以及重惰性气体离子(Ne,Xe)辐照下缺陷演化的特点。

高电离态原子光谱测量

简要介绍了兰州重离子加速器上的高电离态原子光谱实验测量和取得的部分实验结果

Low-spin signature inversion in the pi h(9/2)circle times nu i(13/2) oblate band

Excited states in Tl-188,Tl-190 have been studied experimentally by means of in-beam gamma spectroscopy techniques, and resulted in the identification of a strongly coupled band based on the pi h(9/2) circle times nu i(13/2) configuration with oblate deformation. The oblate band in doubly odd Tl nuclei shows low-spin signature inversion. It is the first experimental observation of low-spin signature inversion for a band associated with the oblate pi h(9/2) circle times nu i(13/2) configuration.

Prototype of the Superferric Dipoles for the Super-FRS of the FAIR-Project

The FAIR China Group (FCG), consisting of the Institute of Modern Physics (IMP Lanzhou), the Institute of Plasma Physics (ASIPP, Hefei) and the Institute of Electric Engineering (IEE, Beijing) developed and manufactured in cooperation with GSI, Germany a prototype of a superferric dipole for the Super-Fragment-Separator of the FAIR-project [1]. The dipole magnets of the separator will have a deflection radius of 12.5 m, a field up to 1.6 T, a gap of at least 170 mm and an effective length of more than 2 meters to bend ion beams with a rigidity from 2 T . m up to 20 T . m. The magnets operate at DC mode. These requirements led to a superferric design with a yoke weight of more than 50 tons and a maximum stored energy of more than 400 kJ. The principles of yoke, coil and cryostat construction will be presented. We will also show first results of tests and measurements realized at ASIPP and at IMP.

He喷嘴带传输及X-γ符合测量装置

本文介绍了He喷嘴带传输及X-γ符合测量装置对重缺中子远离核作活性分离鉴别的基本原理和技术路线，以及该装置首次在本所在线完成的实验结果。通过对110 MeV ~(16)O+~(185)Re实验主要反应产物的测量，指定出~(195)Bi，~(196)Bi，~(192)Tl的半衰期分别为3.11 ± 0.30，4.39 ± 0.53和10.8 ± 1.8 Min，与文献报道一致，并根据母子体衰变平衡拐点Tm初步分析了~(195)Pb；在110 MeV ~(16)O+~(142)Nd实验中，首次测量了~(153)Er的EC/β~+衰变，得到其下列四条新γ线：188.6，352.3，400.0，451.6 KeV(±0.3KeV)，并指定其寿命值T_(1/2) = 35.3 ± 1.6 Sec，与文献报道的根据α衰变测得的半衰期36 ± 2 Sec一致

Theoretical study on analytical potential function and spectroscopic parameters for CaF molecule

The equilibrium properties and potential energy curves of the ground electronic state of CaF have been calculated using the Brueckner Doubles calculation with a triples contribution added [BD(T)] and the gradient-corrected density functional theory with three-parameter exact exchange mixing (B3LY-P) method, with 6-311 + G*,6-311 + G(2df,2pd) and 6-311 + G(3df,3pd) basis sets. All the computational PECs are fitted to analytical potential energy functions using Murrell-Sorbie, Huxley and Tang-Toennies potentials. Based on this, the spectroscopic parameters are calculated, and then compared with some other theoretical and experimental data. (C) 2004 Elsevier B.V. All rights reserved.

额济纳天然绿洲景观变化及其生态环境效应

基于研究区 1987年LandsatTM和 2001年LandsatETM+遥感影像资料, 综合运用遥感与GIS技术手段, 结合景观格局分析软件APACK, 就近 15年来额济纳天然绿洲景观格局变化进行了分析, 并进一步探讨了由此所引起的生态环境效应。研究结果表明: 1) 天然绿洲面积与水域面积急剧缩减, 绿洲荒漠化程度加剧; 2) 绿洲景观与荒漠景观过渡地带为各景观生态类型相互转化最为剧烈的区域; 3) 景观多样性与景观异质性程度减小, 景观稳定性降低; 4)景观变化所引起的生态环境效应包括地下水矿化度升高、水质下降, 植被退化与物种多样性降低, 沙尘暴危害加剧以及生态难民数量增加等。

复合肥长效添加剂是提高化肥利用率的新途径

复合肥长效添加剂是将脲酶抑制剂、硝化抑制剂、磷活化剂有机结合,利用其协同作用比单一抑制剂使肥料具有更长供肥期和更高利用率,达到一次性投肥免追肥的目的。这是提高作物产量和提高化肥利用率的有效手段之一,应大力推广在复混肥中添加这种长效添加剂(NAM)。