Blue-violet luminescence double peak of In-doped films prepared by radio frequency sputtering

ZnO films doped with different contents of indium were prepared by radio frequency sputtering technique. The structural, optical and emission properties of the films were characterized at room temperature using XRD, XPS, UV-vis-NIR and PL techniques. Results showed that the indium was successfully incorporated into the c-axis preferred orientated ZnO films, and the In-doped ZnO films are of over 80% optical transparency in the visible range. Furthermore, a double peak of blue-violet emission with a constant energy interval (similar to 0.17 eV) was observed in the PL spectra of the samples with area ratio of indium chips to the Zn target larger than 2.0%. The blue peak comes from the electron transition from the Zn-i level to the top of the valence band and the violet peak from the In-Zn donor level to the V-Zn level, respectively.

Construction and test of Wien-filter combined with RIBLL

A recoil separator Wien-filter which was developed for the Radioactive Ion Beam Line in Lanzhou (RIBLL) as an extension is described. It consists of 2 quadruple triplets and a standard Wien-filter. It was designed for study of the fusion-evaporation reactions. The overall design, background suppression, the transmission efficiency, the angular acceptance and the momentum acceptance have been described. All the performances fulfil the designed requirements. Based on the test results, with some modifications the investigations of the nuclei with Z <= 110 and the drip-line nuclei in the medium-heavy mass region can be carried out with this facility.

Electron emission induced by the interaction of highly charged ions Pb-207(q+) (24 <= q <= 36) with solid surface of Si(110)

The electron emission induced by highly charged ions Pb-207(q+) (24 <= q <= 36) interacting with Si(110) surface is reported. The result shows that the electron emission yield Y has a strong dependence on the projectile charge state q, incidence angle psi and impact energy E. In fitting the experimental data we found a nearly 1/tan psi dependence of Y. Theoretical analysis shows that these processes are closely related to the process of potential electron emission based on the classical over-the-barrier model.

The effects of the annealing time on helium implantation in Si

The modifications induced in silicon samples by helium implantation before and after isothermal annealing at 673 K have been investigated. The surface morphology has been detected by atomic force microscopy. A hillock structure is observed on the sample surface before and after annealing for 5-10 min. Surface blister formation is observed with an increasing annealing time. The variation of crystal damage with annealing time has been investigated by Rutherford backscattering/channeling. The intensity of the damage peak first increases with annealing time, reaches maximum at an annealing time of 60 min and then decreases. Helium-induced bubbles and residual defects have been observed by transmission electron microscopy, which shows that dislocations are close to the bubbles. (C) 2010 Elsevier B.V. All rights reserved.

CSR特殊磁铁研制

特殊磁铁主要指用于同步加速器束流的注入和引出系统中的各类磁铁，如切割磁铁、BUMP磁铁、KICKER磁铁等。从结构和用途上来看，特殊磁铁基本属于二极偏转磁铁范畴；与常规的二极磁铁相比，只是在运行模式、磁场分布和好场区位置、杂散场分布、磁铁功能以及磁铁结构和材料等方面具有突出的特殊性。如切割磁铁的好场区要紧贴切割边，而切割边外侧的杂散场要降到主场的千分之一以下；BUMP磁铁和KICKER磁铁的磁场值不高，但要以很快的脉冲方式工作，所以就具有大电流、线圈匝数少的特点。各种特殊的性能要求使得特殊磁铁的设计和制造相当复杂。 HIRFL-CSR工程共有四台切割磁铁、四套BUMP磁铁以及两套KICKER磁铁用于加速器束流的注入和引出系统中。论文介绍了特殊磁铁的选型、材料选取、电磁设计、二维及三维磁场计算、电磁参数计算、冷却计算、结构设计以及工艺设计等磁铁设计的全部过程；另外，对磁铁研制的具体细节以及技术要求、加工制造以及测试结果也作了比较全面的介绍。论文将磁铁的二维及三维磁场计算作为设计和论述的重点；因为就目前的技术水平来说，二维及三维磁场的计算是磁铁设计的主要环节，是磁场优化的主要手段，也是其他主要电磁参数计算的基础。特别是三维磁场的计算结果，是磁铁设计的主要技术依据，是一种仿真度极高且经济实用的模拟过程。一些比较成熟的磁场计算软件，如TOSCA、ANSYS、MAFIA等更是具有人机界面简单、建模方便、计算结果直观可靠等优点。特殊磁铁的磁场计算所用的程序是TOSCA；从文中提供的测试结果看，计算结果与实测值的误差只有 1 %，可见其结果是极其可信的。从测试和运行结果来看，各种特殊磁铁的研制是成功的。特殊磁铁的成功研制为HIRFL-CSR的束流注入和引出提供了硬件基础

《中国沙地森林生态系统》评介

沙地森林是分布我国草原地区沙地上的大（中）高位芽植物为建群种形成的森林群落．由于其独特的生态条件、丰富的生物多样性和重要的生态系统功能，对我国北方防风固沙、控制土地沙漠化，改善当地农牧区人民生活环境以及三北防护林体系建设发挥巨大的生态效益、经济效益和...

The reaction route and active site of catalytic decomposition of hydrazine over molybdenum nitride catalyst

The catalytic properties of the passivated, reduced passivated, and fresh bulk molybdenum nitride for hydrazine decomposition were evaluated in a microreactor. The reaction route of hydrazine decomposition over molybdenum nitride catalysts seems to be the same as that of Ir/gamma-Al2O3 catalysts. Below 673 K, the hydrazine decomposes into N-2 and NH3. Above 673 K, the hydrazine decomposes into N-2 and NH3 first, and then the produced NH3 further dissociates into N-2 and H-2. From the in situ FT-IR spectroscopy, hydrazine is adsorbed and decomposes mainly on the Mo site of the Mo2N/gamma-Al2O3 catalyst. (C) 2004 Elsevier Inc. All rights reserved.

不同利用方式对潮棕壤比表面影响的研究

对中国科学院沈阳生态实验站潮棕壤水稻田、玉米地、撂荒地和人工林地4种土地利用方式经过14年后在0~150 cm土体10个土层中土壤比表面的剖面分布进行比较研究的结果表明,不同土地利用方式及不同深度土层土壤比表面差异显著,除林地0~5 cm表层外,4种土地利用方式在80 cm以内深度的土层中土壤比表面随剖面深度增加呈渐次增大的趋势,说明林地表层高有机碳积累对土壤比表面增加可能产生了重要影响。150 cm深度土壤比表面平均值为林地>玉米地>撂荒地>水稻田。土壤比表面与土壤风干含水量及交换性盐基总量呈极显著正相关关系:水稻田、玉米地、撂荒地、林地中土壤比表面与风干含水量相关系数分别为0.767、0.911、0.943、0.953(n=30,P<0.001);与土壤交换性盐基总量的相关系数分别为0.877、0.978、0.673、0.780(n=30,P<0.001)。不同利用方式下土壤比表面与土壤有机碳、全氮、碱解氮呈显著负相关关系,与土壤pH、硫、磷之间的关系因土地利用方式不同而具有一定的差异。研究结果表明,土壤比表面可作为指征不同土地利用方式对土壤理化性质影响的可行的土壤物理学指标,测定不同土壤的比表面可以基本反映出土壤交换性能的差异。

Heat capacity and enthalpy of fusion of penconazole (C13H15C12N3)

Low-temperature heat capacities of penconazole (C13H15Cl2N3) were precisely measured with an automated adiabatic calorimeter over the temperature rang from 78 to 364 K. The sample was observed to melt at 332.38 +/- 0.06 K. The molar enthalpy and entropy of fusion of the compound were determined to be 33580 +/- 11 J mol(-1), 101.03 +/- 0.02 J mol(-1) K-1, respectively. Further research of the melting process for this compound was carried out by means of differential scanning calorimetry (DSC) technique. The result was in agreement with that obtained from the measurements of heat capacities. (C) 2003 Elsevier B.V. All rights reserved.

Low-temperature heat capacity and thermodynamic properties of crystalline 2-chloro-5-trichloromethylpyridine

The low-temperature heat capacities of 2-chloro-5-trichloromethylpyridine were measured with a high-precision automated adiabatic calorimeter in the temperature range from 80 K to 345 K. A solid-liquid phase transition was observed from 318.57 K to 327.44 K with peak temperature 324.67 K; the molar enthalpy and entropy of phase transition, DeltaH(m) and DeltaS(m), were determined to be 14.50 +/-0.02 kJ mol(-1) and 44.66 +/- 0.07 kJ K-1 mol(-1), respectively. The thermal stability was investigated through thermogravimetric analysis (TG). The TG and DTG results reveal that 2-chloro-5-trichloromethylpyridine starts to lose mass at 332 K due to evaporation and completely changes into vapour at 483 K under the present experimental conditions.

长白山地区红松树干呼吸的研究

采用土壤呼吸气室于2003年5～10月测定了长白山阔叶红松林主要树种红松不同径阶不同方位的树干呼吸,同时监测了树干温度和林内温度.结果表明,树干呼吸速率具有明显的季节变化趋势,呈单峰曲线,8月出现最大值,2月呼吸速率最低.树干呼吸速率与树干温度具有显著幂指数关系,同时表现出大径阶树干呼吸速率与温度因子间曲线拟合效果好于小径阶红松.不同径阶树干呼吸速率均呈南面高于北面,并随树干径阶的减小南北面呼吸速率差异降低.不同径阶红松树干平均维持呼吸占总树干呼吸6363%,红松树干径阶越大维持呼吸所占比例越大.依树干径阶大小顺序分别为6676%、7329%和5084%.不同径阶红松树干呼吸Q10值在256～332之间,利用呼吸Q10值分别获得不同径阶树干Rt和Rm的季节变化趋势.因此,当估算生态系统呼吸时应考虑树干不同部位和不同径阶之间的差异.

氮肥长效增效剂──肥隆

氮肥长效增效剂肥隆针对我国农业生产中使用量最多的氮素化肥存在的利用率低（２５％～４５％）、肥效期短（３０～５０天）的两大弊病，中国科学院沈阳应用生态所的科研人员，经过近十年的研究，发明了新型广谱氮肥长效增效剂———肥隆。肥隆是采用多种天然物质与无毒害...