Two-colour laser-induced electron dynamics in two-level quantum system

To attempt to control the quantum state of a physical system with a femtosecond two-colour laser field, a model for the two-level system is analysed as a first step. We investigate the coherent control of the two-colour laser pulses propagating in a two-level medium. Based on calculating the influence of the laser field with various laser parameters on the electron dynamics, it is found the electronic state can be changed up and down by choosing the appropriate laser pulses and the coherent control of the two-colour laser pulses can substantially modify the behaviour of the electronic dynamics: a quicker change of two states can be produced even for small pulse duration. Moreover, the oscillatory structures around the resonant frequency and the propagation features of the laser pulses depend sensitively on the relative phase of the two-colour laser pulses. Finally, the influence of a finite lifetime of the upper level is discussed in brief.

强外加电场与大调制度下光折变动力学光栅形成研究

强外加电场与大调制度在光折变效应的研究中已经得到了广泛应用。采用PDECOL算法, 严格求解光折变带输运方程, 得到外加电场时不同调制度下光折变晶体中随时间变化的空间电荷场、载流子浓度, 并讨论了外加电场对它们的影响。通过将物质方程与耦合波方程联立数值求解, 可得到光折变光栅形成过程中两波耦合增益系数以及光束条纹相位的变化。模拟结果表明, 在强外加电场作用下, 两束记录光之间的光强与相位耦合都得到了增强, 而原有的解析式忽视了强外加电场与大调制度对空间电荷场相位耦合的影响, 此时不再适用。同时发现折射率光

Religious Coping, Social Support and Subjective Severity as Predictors of Posttraumatic Growth in People Affected by the Earthquake in Chile on 27/2/2010

The aim of this research is to study the impact of religious coping, social support and subjective severity on Posttraumatic Growth (PTG) in people who lost their homes after the earthquake in Chile in 2010 and who now live in transitional shelters. One hundred sixteen adult men and women were evaluated using a subjective severity scale, the Posttraumatic Growth Inventory (PTGI), the Multidimensional Scale of Perceived Social Support (MSPSS) scale of social support and the Brief RCOPE scale of religious coping. The multiple linear regression analysis shows that social support and positive religious coping have an impact on PTG. On using a bootstrap estimate, it was found that positive religious coping fully mediates the relationship between subjective severity and PTG.

高效率599nmBa（NO3）2外腔喇曼激光器

橘黄色波段固体激光器在基于荧光探测的生物医学诊断和显示等众多方面有着广泛的实际应用．报道了利用532nm的Nd：YAG倍频激光抽运外置喇曼腔内的硝酸钡晶体，获得高效率的599nm橘黄色喇曼激光的实验结果．对外置喇曼腔实验装置和运转参量进行了优化，喇曼振荡腔由对二阶斯托克斯光有最优化反射率的腔镜构成，对实验中所得到的二阶斯托克斯喇曼激光脉宽压缩及出现双尖峰的现象进行了分析．当抽运光功率达到4．1W时，获得二阶斯托克斯喇曼激光功率为710mW，输出光中心波长为599．38nm，半峰全宽（FWHM）为1．1nm

海南岛作物种质资源考察与评价

1、全面考察了海南岛19个县(市)，设1444个考察点，其地貌类型包括山地、丘陵、盆地、沼泽地及海滩，行程15万公里，考察的作物包括粮食、油料、蔬菜、果树、纤维、茶叶、桑树、橡胶、椰子、腰果、油棕、龙舌兰麻类、胡椒、咖啡、可可、花卉、香料、药材、木棉、珍稀濒危植物、绿肥等21大类资源(包括栽培和野生类型)，取得了系列科学考察成果资料。2、共搜集各类作物种质资源5545份，其中具生命力的活种质4922份；腊叶标本7437份；我国特有种6个；海南特有种122个。3、撰写各类作物考察报告46篇，考察工作报告22篇，资源目录8册；提出各类作物种质资源的保护和开发利用建议22篇；编印《海南岛作物种质资源考察收集目录》，均具有重大学术价值，是珍贵的资料。4、基本摸清了各类作物种质资源在海南岛上的分布、生境概况。每份种质都建立了记录卡归类保存。5、列入濒危级的有40个种，渐危级64个种，稀有级71个种。同时，发掘了一些作物的丰产源、优质源、抗源、早花等400份供开发利用。6、对考察收集起来的种质作了妥善的保存，保存方法有：1156份入国家种质库；3947份入承担单位资源圃保存；3442份就地保存。对珍贵的、特殊的及新发现的种质进行了录像。大大地丰富了我国作物资源库，对栽培作物的起源、演变、进化、分类的研究有重要的理论价值和学术意义。7、拍摄资源彩色照片4170张。

Performance of genetically improved farmed tilapia (GIFT) under mono and mixed cui ture with silver barb (Barbodes gonionotus) in south-west Bangladesh

A participatory on-farm trial was carried out to evaluate the production performance of GIFT (genetically improved farmed tilapia) strain of Oreochmis sp., either alone or with silver barb (Barbodes gonionotus), in six rain-fed freshwater ponds of coastal area. There vvere two treatments; (i) GIFT alone at a stocking density of 24,700/ha (T1) and (ii) 1:1 combination of GIFT and silver barb (T1). Each of the treatments had three replications. A significantly (p1444.32 kg/ha). The results reveal that GIFT monoculture can performe better in rain-fed seasonal freshwater ponds of southwest coastal areas.