斜入射激光等离子体堵口时空特性研究

在“星光II”上首次利用X光12分幅相机(XFC)成功地观测到了1.053 μm激光以45°方向斜入射孔靶和半腔靶等离子体堵口的时间和二维空间图象,获得了等离子体堵口速度,同时通过一维模型给出了斜入射条件下的等离子体堵口速度。实验结果表明：相同参数条件下半腔靶与孔靶相比,等离子体喷射速度高约15%。一维模型给出的等离子体喷射速度与XFC测出的等离子体喷射速度在实验误差范围内是一致的。     

The inverse electromagnetic scattering problem by a penetrable cylinder at oblique incidence

In this work, we consider the method of non-linear boundary integral equation for solving numerically the inverse scattering problem of obliquely incident electromagnetic waves by a penetrable homogeneous cylinder in three dimensions. We consider the indirect method and simple representations for the electric and the magnetic fields in order to derive a system of five integral equations, four on the boundary of the cylinder and one on the unit circle where we measure the far-field pattern of the scattered wave. We solve the system iteratively by linearizing only the far-field equation. Numerical results illustrate the feasibility of the proposed scheme.     

A new spectroscopic tool for surface layer analysis: multiple-angle incidence resolution spectrometry

A series of application studies of infrared multiple-angle incidence resolution spectrometry (IR-MAIRS) have been reported since it was first proposed as a unique technique for analyzing molecular orientation in thin films on an optically transparent substrate, and both expected and unexpected benefits of IR-MAIRS have been revealed. In this review, cutting-edge application studies are summarized systematically, and the principle of MAIRS is explained from a new point of view.     

Radiation damage in polymer films from grazing‐incidence X‐ray scattering measurements

Grazing‐incidence X‐ray scattering (GIXS) is widely used to analyze the crystallinity and nanoscale structure in thin polymer films. However, ionizing radiation will generate free radicals that initiate crosslinking and/or chain scission, and structural damage will impact the ordering kinetics, thermodynamics, and crystallinity in many polymers. We report a simple methodology to screen for beam damage that is based on lithographic principles: films are exposed to patterns of X‐ray radiation, and changes in polymer structure are revealed by immersing the film in a solvent that dissolves the shortest chains. The experiments are implemented with high throughput using the standard beam line instrumentation and a typical GIXS configuration. The extent of damage (at a fixed radiation dose) depends on a range of intrinsic material properties and experimental variables, including the polymer chemistry and molecular weight, exposure environment, film thickness, and angle of incidence. The solubility switch for common polymers is detected within 10–60 s at ambient temperature, and we verified that this first indication of damage corresponds with the onset of network formation in glassy polystyrene and a loss of crystallinity in polyalkylthiophenes. Therefore, grazing‐incidence X‐ray “patterning” offers an efficient approach to determine the appropriate data acquisition times for any GIXS experiment. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54, 1074–1086     

一种变权综合评价方法及其在膨胀土分类中的应用

针对膨胀土胀缩等级分类问题,构造了一种新的区间关联函数,提出了"分类特征体现度越大,权重越大"的权重计算原理,给出了一种新的变权计算方法,将单指标关联函数的最大值作为其评价类的靶心坐标,根据样本与靶心的贴近度,对样本进行分类.将该方法应用于膨胀土的胀缩等级分类,其合理性和有效性得到了验证.     

ON Δ-GOOD MODULE CATEGORIES OF QUASI-HEREDITARY ALGEBRAS

A useful reduction is presented to determine the finiteness of △-good module category F(△)of a quasi-heredltary algebra. As an application of the reduction, the f(△)-finitenetess of quasi-hereditary M-twisted double incidence algebras of posets is discussed. In particular, a complete classification of F(△)-finite M-twisted double incidence algebras is given in case the posets are linearly ordered.     

一种基于TOPSIS思想的改进灰色关联法及其在方案评估中的应用

提出了一种基于TOPSIS思想的改进灰色关联法,方法采用了TOPSIS思想,通过标准化处理,能够将灰色关联法给出的评估结果转换为,TOPSIS方法所要用到的与最优/最劣解的距离,从而给出一个稳定的评估结果,弥补了传统灰色关联法受全局极值影响大的缺点.经实例分析证明,方法可以应用于方案评估中,并能够得出可行、稳定、科学的评估结果.     

一类4-正则平面图的邻点可区别关联色数

所谓图R_n是指具有如下结构的平面图:R_n=(V,E),其中顶点集合V={u_1,u_2,…,u_n}U{v_1,v_2,…,v_n},边集合E={u_iu_(i+1),v_iv_(i+1),u_iv_i,u_iv_(i+1)|i=1,2,…,n},其中u_(n+1)=u_1,v_(n+1)=v_1.通过研究R_n的邻点可区别关联着色,给出了当n=4,n是3或者5的正整数倍时,R_n的邻点可区别关联色数.