金属Zr中自间隙子扩散的分子动力学模拟

本文采用分子动力学方法,对HCP结构的金属锆中的自间隙子扩散进行研究。通过检查不同时刻维格纳原胞(Wigner-Seitz cell)中的原子个数的方法得到不同时刻缺陷的位置,应用Rahman-Parrinello应力控制方法计算出了外应力为零时α-Zr的4种不同扩散机制在不同温度下的扩散系数,通过扩散系数随温度变化的关系得到各种扩散机制的势垒。     

Single-Proton Pickup Reaction of the Halo Nucleus ^6He on a ^9Be Target at 25 MeV/nucleon

The inclusive differential cross sections of the ^7 Li nucleus in a reaction induced by ^6He on a ^9Be target are measured at an incident energy of 25 MeV/nucleon. Finite-range distorted-wave Born approximation calculations suggest that these ^7 Li particles are formed in a direct single-proton pickup reaction ^9Be（^6He,^7 Li）^8Li. The experimental data can be well reproduced by taking into account of the contributions of both the ground states and the first excited states of ^7Li and ^8Li.     

喷雾热解法制备的SrWO4膜的阴极射线发光

利用超声喷雾热解法制备了钨酸锶SrWO₄多晶发光膜,并研究了制备条件及掺杂对其阴极射线发光特性的影响.生成的发光膜在300℃以上退火后具有白钨矿结构,其阴极射线发光为一宽带的蓝光,包括一个位于448nm的蓝色发光带和一个位于488.6nm的蓝绿色发光带,是由阴离子络合物WO₄^2-的电荷转移跃迁引起的.发光强度随着退火温度的升高而增强,而退火气氛对其影响不大.在SrWO₄膜中掺入银离子Ag⁺和镧离子La³⁺后,不影响其发光特性,但铕离子Eu³⁺的掺入对发光特性有影响.     

气红联用法研究标准桃金娘油的化学成分

采用毛细管气相色谱-傅里叶变换红外光谱联用技术法(气红联用,GC-FTIR),结合计算机检索对标准桃金娘油化学成分进行分析和鉴定,用气相色谱面积归一化法测定各组分的相对百分含量;经毛细管色谱从标准桃金娘油中分离出12个峰,并且采用FTIR法确认了所含的化合物。标准桃金娘油主要成分为三种单萜,分别为1,8-桉叶素、D-柠檬烯和α-蒎烯,含量分别为46.35%,36.83%和14.70%,三者占总量的97.88%,分析结果与GC-MS分析相一致。由于GC-FTIR分析能确定出经气相色谱分离后的有机物的异构体,故与GC-MS分析相比较,此法具有更广泛的应用价值。该研究可为综合利用开发桃金娘科植物提供科学依据。     

Variable Separation and Derivative-Dependent Functional Separable Solutions to Generalized KdV Equations

Using the generalized conditional symmetry approach, a complete list of canonicalforms for the Kortewegde-Vries type equations with which possessing derivative-dependent functional separable solutions (DDFSSs) is obtained.The exact DDFSSs of the resulting equations are explicitly exhibited.     

蜡烛火焰三维温度场重建实验研究

本文在实验室中以蜡烛火焰为研究对象,研究采用辐射图像处理技术重建蜡烛三维温度场。并采用细丝热电偶实测火焰局部温度,对蜡烛火焰三维温度场可视化的结果进行了比较。结果表明,火焰高温区的重建温度是合理的,此方法能够很好地重建单峰、双峰三维温度分布。进一步证实了基于火焰图像处理技术实现三维温度场可视化的可行性。     

纳米随机激光

介绍了以纳米ZnO粉末作为增益介质产生的随机激光。讲述了随机激光的特点、发展历史和它的应用前景。文章以随机激光的理论为基础，描述了四种主要的用于随机激光研究的方法。     

A (2+1)-Dimensional Integrable sinh-Gordon Extension

In this letter, we point out that if there is a (2+1)-dimensional extension of the KdV equation,then we can get a corresponding (2+1)-dimensional sine-Gordon (SG) or sinh-Gordon (SHG) extension which is related to the negative flow equation of the KdV extension. The (2+1)-dimensional SG (or SHG) extensions related to the KP, breaking soliton and Nizhnik-Novikov-Veselov equations are known in literature while the (2+1)-dimensional SHG extension related to the negative Aow equation of the Boiti-Leon-Manna-Pempinelli (BLMP) equation is obtained in this letter thanks to the Schwartz form of the BLMP equation being conformal invariant.     

Higher-Dimensional Integrable Models with a Common Recursion Operator

Starting from any one of hereditary symmetries, we can construct a type of integrable models with arbitrary dimensions. The models with different dimensions obtained from a same hereditary symmetry possess a common recursion operator. The symmetry structures of the models are studied in their potential forms. Using the formal series symmetry approach, we can get various sets of formal series symmetries with some arbitrary functions. Generally, these sets of series symmetries are not truncated for arbitrary functions. The series symmetries wiU all be truncated if the arbitrary functions are fixed as polynomials. Some sets of nontruncated symmetries constitute generalized Virasoro algebras. The more details about the symmetries and algebras are discussed for a concrete (3+1)-dimensional KdV equation.     

一维自旋-1/2XY模型的磁场效应

本文主要利用Haldane的谐振流理论——玻色化方法研究外场中的自旋-1/2XY模型。本文首先将无磁场情况下该模型的哈密顿进行了玻色化与对角化,并单独讨论了磁场项,最后两者联合给出外磁场中一维自旋-1/2模型哈密顿的玻色化形式。在这种形式下哈密顿量中的协变问题可以通过平移费米点来解决,所以,在阿贝尔玻色化方案下对玻色场算符做了重新定义,得到一个新的协变的哈密顿,从而解决了由于扰动所带来的问题,各关联函数也随之给出;最后简单讨论了平移费米点给模型关联函数的表达式带来的变化,以及玻色化方法较之其他方法的优长。