半导体激光器光谱的聚类分析

本文提出了分析半导体激光器光谱分布差异的聚类算法.首先,介绍了聚类分析的有关概念和原理,接着给出了分析光谱差异的算法.该算法具有较强的有效性和通用性.最后,给出了一个具体应用.     

CLUSTER AND PRINCIPAL COMPONENT ANALYSIS OF THE SOLVENT EFFECTS ON THE C˭O STRETCHING FREQUENCY OF ACETOPHENONE

The solvatochromic shift of the C?O stretching frequency of acetophenone is studied by cluster (CA) and principal component analysis (PCA) confirming our previous results about the determining contributions to the polarity, polarizability, and electrophilicity of the medium on this effect. It is shown that the used combination of Varimax mode of PCA and multiple regression (apportioning modeling) makes it possible to obtain absolute principal component scores (APCS), which include the solvent parameters describing definite solute–solvent interactions. The adequateness of the suggested chemometric model is checked by “reverse” CA of 25 solvents as objects with respect to the APCS calculated.     

分数量子Hall效应的有限集团研究

本文在均匀正电背景下,利用哈密顿量数值对角化方法讨论了强磁场中二维有限电子体系。对库仑相互作用的三电子体系给出了详细的讨论。计算了1/3填充因子的基态能和波函数,并且与不可压缩流体模型的结果作了比较。 关键词：     

嵌埋式InP团簇光学吸收性质的研究

利用双束共蒸发的方法制备InP∶CaF₂复合膜，InP以团簇的形式嵌埋在绝缘介质CaF₂中，团簇大小可通过改变携带气压和蒸发电流来控制.样品的TEM结果表明：InP嵌埋团簇呈多晶结构，团簇尺寸10nm左右.研究了该复合膜的线性光吸收性质，半导体InP团簇表现出明显的量子效应，其吸收边随着团簇尺寸的减小发生了蓝移. 关键词：     

趋向统一发展的团簇科学

团簇科学在发展过程中，从原子核物理、凝聚态物理和量子化学等引入许多概念和方法，构成团簇研究的中心议题，逐渐形成一门介于原子分子物理和凝聚态物理之间的交叉学科．文章就团簇结构和性质研究的某些最新进展进行了评述，并与原子核和量子点等的性质进行了比较．     

超短脉冲强激光与团簇的相互作用

超短脉冲强激光与团簇的相互作用已被证明能够产生能量高达ＭｅＶ量级的高能离子和中子以及非常强的Ｘ射线辐射。广阔好原子团簇在超短脉冲强激光场的作用下的加热、电离和膨胀等机制,对这种相互作用的深入研究可能会对激光核聚变和Ｘ射线激光等应用领域产生重大影响。     

ANALYSIS OF THE E2 TRANSITIONS BETWEEN THE d+a CLUSTER STATES OF 6Li WITH THE RGM

The E2 reduced transition probabilities between the d-a cluster states of ⁶Li were calculated by the RGM in this paper.The resulting B(E2;E₁→E₀)=21.06fm⁴ consistented with the experimental value 25.1±2.0fm⁴ more than the calculated values of the double-well cluster model including p-state exciting and LCCO.Also,the B(E2;E₃→E₀)=9.67fm⁴ coincided with the exprimental value 6.483±3.360fm⁴ within the error range.     

孤立碳颗粒聚团燃烧过程的研究

数值模拟气体流过孤立碳颗粒聚团的燃烧反应过程。计算表明穿过颗粒聚团的气体流量主要与颗粒聚团空隙率有关。当颗粒聚团空隙率小于0．8时,穿过颗粒聚团的气体流量可忽略不计。碳颗粒聚团内温度呈现迎来流面低、背流面高,两侧低中间高; CO和CO2含量呈现迎来流面低、背流面高,两侧低中间高的变化趋势;而O2含量迎来流面高、背流面低,两侧高中间低。颗粒聚团内不同位置的颗粒消耗的碳量不同。颗粒的相互团聚将降低碳的消耗量,同时也抑制碳颗粒燃烧过程NO和N2O的生成。     

借助集团展开的超辐射热力学

N原子-单模辐射场相互作用系统当作相互作用准玻色子-光子系统并处理作巨正则系综.系统热力学势的明显表达式应用集团展开得到，某些热力学量按通常的热力学公式导出.数值计算和图示表明了这个超辐射系统的热力学行为，在超辐射态临界线上和其他地方出现的奇异性揭示了在此合作系统中存在第二类相变换. 关键词：     

3种常见腔型LD泵浦全固体绿激光器

总结LD泵浦全固体绿激光器的3种常见腔型：即传统直腔、三镜折叠腔和四镜环行腔。分别对3种腔型的特点进行分析。     

小型低值LD激光测距仪的研制

研制成一种小型,低值,便携式,对人眼安全,无合作目标的LF-1型系列LD激光测距仪.激光波长905nm,激光峰值功率10W,脉宽25ns,重复频率100Hz系统的测距范围14-1000m,测距精度＜±1m,有多种工作模式,具有省电功能.LF1LRF是一种光子雷达系统,它的测距能力优于其它低值的半导体激光测距仪.本文讨论LD激光测距仪研制中的几个问题.     

HIGH ENERGY CLUSTER SCATTERING THEORY OF MANY PARTICLES SYSTEM

Within the framework of the Glauber theory, we divide the many particle systeminto two subsystems formed. by the "valence" particles and "sea" particles respective-ly. Then the multiple scattering amplitudes can be divided into "sea","sea","sea","valence", "valence","sea", and "valence","valence" multiple scattering amplitude.For the calculations of these different amplitudes different effective approximatemethods are proposed, Finally, for "sea"."sea". "sea""valence", "valence" "sea"and "valence"."valence" processes, we obatain the respective S-matrices which phy-sically clear and convenient in calculation.     

团簇淀积纳米结构薄膜的计算机模拟

对团簇的淀积方式作了简介。着重对团簇的淀积过程进行了计算机模拟,从中得出了淀积的尺寸分布与团簇在衬底上的徙动长度有关,而团簇的聚合长大存在一临界尺寸。并给出低能Ｐｂ团簇在碳膜表面的徙动长度和聚合的临界尺寸。     

稠密气固流动中颗粒聚集的定量评价

本文提出了定量评价稠密两相流动中颗粒聚集现象的参数和方法:用碰撞频率的大小估计颗粒聚集的强弱;用颗粒体积分数的标准偏差评价流场中颗粒分布的不均匀程度;用颗粒分布的相关系数衡量流动的相似性;用颗粒体积分数的概率分布和颗粒分布曲线描述流场细节;用高密集区域颗粒数目比例和稀疏区域面积比例来反映流场的特征部分。     

H^＋5团簇离子的形成和分解

简报报告了１．８ＭｅＶ的Ｈ＋５团簇离子及其产物的测量结果。讨论了Ｈ＋５的形成和分解反应。     

多体作用对氦原子团簇He9压缩特性的贡献

 采用Lowdin方法计算了处于压缩状态的氦原子团簇He₉体心立方向型的排斥势及其多体分量，并由此计算出团簇微观压强及其多体分压强。结果发现，多体作用对氦原子团簇He₉压缩特性贡献较大。在相同体积下，由两体近似方法计算的体系压强比多原子体系实际压强偏高10%~30%；考虑三体分压强修正后，近似理论的计算值又会偏低1.5%~10%；只有同时考虑三体、四体修正后，近似理论计算值与实际多原子体系的压强值基本一致。团簇He₉所表现出的压缩特性与固态氦的实验结果相符合。     

胶体晶体结晶过程与人造三维周期性集团点阵材料

胶体晶体结晶的物理过程和以胶体晶体为基的三维周期性集团点阵材料的制备是目前实验凝聚态物理的一个热点领域,文章对胶体粒在悬浮液中自组织有序化的物理机制、结构相变与形态的形成和以胶体晶体为基的人造三维周期性点材料作了介绍,无论是从实验上还是理论上看,对胶体体系中发生的自组织有序化的物理机制还有没有给出令人信服的证据和解释。而胶体晶体的制备为具有新异功能的三维周期性集团国材料设计开辟了一条新途径,因而在     

CLUSTER EFFECTS IN DEUTERIUM CLUSTER ION IMPLANTATION ON SOLIDS

Atomic and nuclear cluster effects of (D⁺₃) were studied by alternative implantation of deuterium cluster ion beam and isolated deuteron (D⁺) beam on metal targets. The beam energy was adjusted from 10keV/d to 100keV/d in experiment. The atomic cluster effect was shown by the enhancement of X-ray emission induced by cluster deuterion. The average ratio of X-ray intensity induced by each cluster deuteron to that induced by each isolated deuteron is about 2.6 in the experimental energy region. The nuclear cluster effect is shown by the difference of D-D fusion rates induced by two kinds of deuterons under the same experimental conditions. The ratio of the D-D fusion rates induced by the two kinds of deuterons is energy dependent.     

强激光场中原子团簇的电离和光辐射

通过数值求解一维含时薛定谔方程,研究了原子与原子围簇的电离、电子的时间演化和光辐射现象。结果表明,原子团簇比原子更易于电离,原子团簇中电子的时间演化和原子中电子的时间演化不同,光辐射频率也要高很多。     

THE STRUCTURE FUNCTION OF SIX-QUARK CLUSTER AND THE EMC EFFECT

Based upon the experiments on electric form factor for deutron use is made of the valon model to determine the valon distribution functions in a six-quark cluster. By using the QCD evolution equation, the Q² dependence of the structure function of a six-quark cluster is obtained. The EMC effect is discussed and it is pointed out that the distortion of the nucleon structure function in nuclei may be ascribed to the contributions from the six-quark cluster(for x>0.3) and the meson cloud(for x<0.3).