构造常数数列解决数列问题

2008年全国高中数学联赛湖北省预赛试题中有这样一道题：设数列{an}满足：a1=1，a2=2，an＋2/an=an＋1^2＋1/an^2＋1（n≥1）.     

First-Principles Calculation for the Electron-Phonon Coupling Constant of Superconducting MgB2

We use a first-principles plane wave method with the new relativistic analytic pseudopotential of the Hartwigsen,Goedecker and Hurter (HGH) scheme and the pseudopotential of the Troullier-Martins scheme to calculate the eleetron-phonon coupling constant λ of superconducting MgB2. The calculated results show that there is a peak at about 300-350cm^-1 in the eleetron-phonon spectral functional α2F(ω), duo to the coupling of the electrons to the acoustic phonon, and the relativistic effect appears in the high frequencies zone. All the results agree well with the present and previous experimental data,     

First-Principles Calculations of Elastic Constants of Superconducting MgB2

The five independent elastic constants of superconducting MgB2 are obtained using the first-principles plane wave method with the new relativistic analytic pseudopotential of the Hartwigsen-Goedecker-Hutter (HGH) scheme in the frame of local density approximation. The dependences of bulk modulus on temperature and pressure are also obtained. It is suggested that the HGH-type pseudopotentials are successful in investigating the ground-state mechanical properties of any solids.     

溶剂萃取法提锂的研究进展

总结了采用溶剂萃取法在盐湖卤水中提取锂资源的三类萃取剂:酸性萃取剂、中性络合萃取剂和碱性萃取剂,分析了三类不同萃取剂在萃取锂工艺过程的优缺点,指出了溶剂萃取法从高镁锂比的盐湖卤水中萃取提锂尚待攻克的技术难题。     

关于工业产品生产许可证管理的探讨

对工业产品生产许可证管理方面存在的一些问题进行了探讨。经分析认为,在做好实地核查及证后监管的前提下,生产许可证制度的关键在于宣贯和相关细节的明确上。     

Effects of preparation parameters on growth and properties of β-Ga2O3 film

The Ga$_{2}$O$_{3}$ films are deposited on the Si and quartz substrates by magnetron sputtering, and annealing. The effects of preparation parameters (such as argon-oxygen flow ratio, sputtering power, sputtering time and annealing temperature) on the growth and properties ($e.g.$, surface morphology, crystal structure, optical and electrical properties of the films) are studied by x-ray diffractometer (XRD), scanning electron microscope (SEM), and ultraviolet-visible spectrophotometer (UV-Vis). The results show that the thickness, crystallization quality and surface roughness of the $\beta $-Ga$_{2}$O$_{3}$ film are influenced by those parameters. All $\beta $-Ga$_{2}$O$_{3 }$films show good optical properties. Moreover, the value of bandgap increases with the enlarge of the percentage of oxygen increasing, and decreases with the increase of sputtering power and annealing temperature, indicating that the bandgap is related to the quality of the film and affected by the number of oxygen vacancy defects. The $I$-$V$ curves show that the Ohmic behavior between metal and $\beta $-Ga$_{2}$O$_{3}$ films is obtained at 900 ${^\circ}$C. Those results will be helpful for the further research of $\beta $-Ga$_{2}$O$_{3}$ photoelectric semiconductor.     

硼酸盐晶体及其溶液结构研究现状

硼酸盐结构十分复杂,主要针对硼酸盐晶体结构和硼酸盐水溶液结构问题,总结了水合硼酸盐晶体结构及其结晶行为,归纳了硼酸盐水溶液中硼酸盐的主要存在形式及其结构研究,并侧重介绍和评价了电导/电势滴定、红外(IR)、拉曼光谱(Raman)、11B核磁共振等方法在硼酸盐溶液结构研究方面的进展,指出了未来的发展方向.     

软X射线分光晶体KAP的反射率特性

弯晶谱仪是激光等离子体软X射线的有效诊断工具,KAP是弯晶谱仪的分光晶体之一.利用原子散射因子和结构因子分量,以及镶嵌晶体模型计算KAP的积分反射率,表明KAP的积分反射率与波长有关,先随波长增大而减小,后随波长增大而增大.此外,还计算了KAP的峰值反射率、半最大值宽度、能量宽度和能量分辨率,表明峰值反射率和能量分辨率随波长增大而减小.     

短肽自组装水凝胶的温和制备方法及免疫佐剂应用

短肽自组装水凝胶是一种新型的软物质材料,它由短肽通过自组装形成,具有生物活性和生物相容性高、易于设计与合成以及对外部刺激能快速响应等优点,它在生物医药、分析检测、组织工程等领域有很高的应用前景.本文主要总结了我们近年来在短肽自组装水凝胶温和制备方法研发方面的工作,同时介绍了短肽自组装水凝胶在疫苗佐剂方面的创新应用,并探讨了短肽自组装水凝胶研究领域的挑战及研究热点.     

罗丹明6G在醇溶液中的荧光频移特性分析

罗丹明6G在甲醇、乙醇、乙二醇溶液中均发出较强的荧光。当醇溶液浓度为33.3%时,基本不存在频移现象。当醇溶液浓度为99.7%时,荧光峰发生蓝移或红移,分析认为该频移是由罗丹明6G和醇类物质分子相互作用(如氢键、静电吸引)导致激发态能量升高、荧光峰蓝移,与醇类物质分子中羟基OH的孤对电子跃迁导致荧光能量降低、荧光峰红移,这两种因素相互竞争的结果,且在高浓度醇溶液中,羟基OH数量越多,红移越明显。