The Design of the Black Patch

Ｔｈｅ　Ｄｅｓｉｇｎ　ｏｆ　ｔｈｅ　Ｂｌａｃｋ　ＰａｔｃｈＴｈｅＤｅｓｉｇｎｏｆｔｈｅＢｌａｃｋＰａｔｃｈ￥ＧＡＯＷａｎｒｏｎｇ；ＺＨＡＮＧＸｉｎｇｚｈｅｎ；ＰＡＮＬａｉｊｉｕ；ＷＡＮＧＪｉａｎｇａｎｇ（ＳｐａｃｅＯｐｔｉｃｓＤｅｐａｒｔｍｅｎｔ，Ｘ...     

High Performance AlGaAs Quantum Well Lasers with Low Beam Divergence Grown by Molecular Beam Epitaxy

ＨｉｇｈＰｅｒｆｏｒｍａｎｃｅＡｌＧａＡｓＱｕａｎｔｕｍＷｅｌｌＬａｓｅｒｓｗｉｔｈＬｏｗＢｅａｍＤｉｖｅｒｇｅｎｃｅＧｒｏｗｎｂｙＭｏｌｅｃｕｌａｒＢｅａｍＥｐｉｔａｘｙ￥ＹＡＮＧＧｕｏｗｅｎ；ＸＩＡＯＪｉａｎｗｅｉ；ＸＵＺｕｎｔｕ；ＸＵＪｕｎｙｉ...     

THERMAL INSTABILITY OF D-T BURNING PLASMAS

ＴＨＥＲＭＡＬＩＮＳＴＡＢＩＬＩＴＹＯＦＤ－ＴＢＵＲＮＩＮＧＰＬＡＳＭＡＳ￥Ｂ．Ｒ．ＳＨＩＹ．Ｘ．ＬＯＮＧＨ．Ｇ．ＺＨＡＯ（ＳｏｕｔｈｗｅｓｔｅｒｎｉｎｓｔｉｔｕｔｅｏｆＰｈｙｓｉｃｓ，Ｐ．Ｏ．Ｂｏｘ４３２，Ｃｈｅｎｇｄｕ６１００４１，Ｓｉｃｈｕａｎ...     

Propagation and Beam Quality of Flattened Hermite-Gauss Beams

ＰｒｏｐａｇａｔｉｏｎａｎｄＢｅａｍＱｕａｌｉｔｙｏｆＦｌａｔｔｅｎｅｄＨｅｒｍｉｔｅ－ＧａｕｓｓＢｅａｍｓ￥ＨＵＡＲｅｎｚｈｏｎｇ；ＱＩＡＮＬｉｅｊｉａ，ＦＡＮＤｉａｎｙｕａｎ；ＤＥＮＣＸｉｍｉｎｇ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃ...     

Study on the Amplitude-squared Squeezing Characteristic of the Binomial-like State

ＳｔｕｄｙｏｎｔｈｅＡｍｐｌｉｔｕｄｅ┐ｓｑｕａｒｅｄＳｑｕｅｅｚｉｎｇＣｈａｒａｃｔｅｒｉｓｔｉｃｏｆｔｈｅＢｉｎｏｍｉａｌ┐ｌｉｋｅＳｔａｔｅＸＩＵＸｉａｏｆｅｎｇＪＩＡＮＧＺｕｏｈｏｎｇ（ＨｅｉｌｏｎｇｊｉａｎｇＵｎｉｖｅｒｉｓｔｙ，Ｈａｒｂｉ...     

XRD灵敏度与在同步辐射源上的绝对刻度

在ＢＥＰＣ同步辐射的３Ｂ１束线上，利用多层镜分光，获得生较好，强度较高的软Ｘ光光源。采用美国进口的ＡＸＵＶ－１００Ｓｉ光二极管作为二级标准，对ＸＲＤ探测器和滤片进行绝对刻度，获得了各种阴极ＸＲＤ的灵敏度，其结果与ＬＬＮＬ的实验结果吻合，并对实验结果作了分析。     

Crostalk in WDM SCM Systems due to SRS

ＣｒｏｓｔａｌｋｉｎＷＤＭＳＣＭＳｙｓｔｅｍｓｄｕｅｔｏＳＲＳＺＨＡＯＬｉａｎｇＸＵＤａｙｏｎｇＷＵＤｅｍｉｎｇＹＵＡＮＨｏｎｇＸＵＡｎｓｈｉ（ＤｅｐａｒｔｍｅｎｔｏｆＥｌｅｃｔｒｏｎｉｃｓ，ＢｅｉｊｉｎｇＵｎｉｖｅｒｓｉｔｙＮａｔｉｏｎａｌＫｅｙＬ...     

Influence of Buffer-Layer Thickness on Performance of Waveguide Modulators

ＩｎｆｌｕｅｎｃｅｏｆＢｕｆｆｅｒ－ＬａｙｅｒＴｈｉｃｋｎｅｓｓｏｎＰｅｒｆｏｒｍａｎｃｅｏｆＷａｖｅｇｕｉｄｅＭｏｄｕｌａｔｏｒｓ￥ＸＡＩＮＧＹｕｎｎａｎ；ＷＡＮＧＫｕｉｒｕ；ＹＵＧｕｏｘｉａｎ；ＸＵＤａｘｉｏｎｇ（ＢｅｉｊｉｎｇＵｎｖｅｒｓｉｔｙ...     

氟原子与氯溴代甲烷反应的光谱及动力学研究

本文报导了氯原子与三种含氢氯溴代甲烷（ＣＨ２ＢｒＣｌ，ＣＨＢｒＣｌ２，ＣＨＢｒ２Ｃｌ）反应的光谱及动力学研究结果，观察了这些反应的可见化学发光（３００－９００ｎｍ）和染料Ｒ６Ｇ波段（５６５－６１０ｎｍ）的激光诱导荧光，观测到ＨＦ基电子态振动泛频跃迁和Ｂｒ２（Ａ，Ｂ），ＢｒＦ（Ｂ）分子电子激发态跃迁的发射谱以及ＢｒＦ（Ｘ），ＣＨＦ（Ｘ）的基电子态的激发谱，计算机模拟光谱求出了Ｂｒ２（Ｂ），ＢｒＦ（Ｘ     

束—气条件下He（2^3S）＋CH2Cl2碰撞传能反应的动力学研究

本文在束－气条件下研究了亚稳态原子Ｈｅ（２＾３Ｓ）与ＣＨ２Ｃｌ２间的传能反应，测得了由该反应产生的ＣＨ（Ａ＾２△－Ｘ＾２П），ＣＨ（Ｂ＾２∑＾－Ｘ＾２П）ＣＨ（Ｃ＾２∑＾＋－Ｘ＾２П）和Ｈ原子（Ｂａｌｍｅｒ系）的化学发光光谱。通过对ＣＨ（Ａ，Ｂ）的光谱进行计算机模拟，推测出初手的ＣＨ（Ａ＾２△，ｖ＾１＝０－２）态振动分布为Ｎｏ：Ｎ１：Ｎ２＝１００：４０±５：１９±２，ＣＨ（Ａ＾２△，ｖ＾１＝０－０     

铝锂合金样品的前处理及其Ag和Li的光谱分析

针对铝锂合金样品检测其Ag和Li,采用等离子体原子发射光谱法(ICP-OES)同时测定Ag和Li,火焰原子吸收光谱法(FAAS)分别测定Ag和Li,单宁酸分光光度法(VS)测Ag,对不同的光谱测定方法进行了比较,证明了ICP-OES检测铝锂合金中的Ag和Li具有较高的抗干扰性。对比了三种不同的样品消解方法,确定了FAAS测Li采用王水溶样最佳,ICP-OES,FAAS和VS测Ag采用HCl+H₂O₂体系溶样准确度更高。详细讨论了样品中共存元素Al, Mg, Zr, Ti, Cu的干扰及消除方法。用氨水沉淀消除共存元素Al,Ti,Zr,8-羟基喹啉沉淀分离Mg和Cu的方法消除原子吸收光度法测Ag的干扰;采用磷酸盐沉淀分离Ti而消除原子吸收光度法测Li的干扰;采用与原子吸收光度法测银相同的消除干扰方法,消除上述离子干扰,滤去干扰沉淀后,用硝酸赶盐酸解蔽Ag+离子,同时分解消除8-羟基喹啉的颜色,以消除分光光度法测银的干扰。对比消除干扰前后的结果发现准确度显著提高,证明消除干扰的方法切实有效。将选择的最佳消解体系和干扰消除方法应用于铝锂合金样品的测定,ICP-OES测Li和Ag回收率分别在100.39%～103.01%和100.42%～103.73%之间,FAAS测Li和Ag 回收率分别在95.91% ～99.98%和98.04%～103.67%之间,分光光度法测Ag回收率在98.00%～101.00%之间,测定结果满足分析要求。     

Specification of spectral line shape and multiplex dispersion by self-imaging and moiré technique

Due to finite width of a spectral line, the visibility of the moiré fringes formed by a grating and the self-image of another similar grating reduces by the increase of the self-image order. This effect is exploited to specify the spectral line shape by evaluating the Fourier transform of a function related to the visibility. Even, by using in-expensive optics, the technique can provide the spectral line shapes of rather broad widths—of the order of nanometer and more—by precisions that are comparable by those obtained by expensive Fourier transform spectrometers.Besides, it is shown that by comparing the line shapes obtained with and without a dispersive medium between the gratings, one can specify the dispersion function of the medium in the wavelength range covered by the spectrum.     

提高布里渊光时域反射应变仪测量空间分辨力的等效脉冲光拟合法

由于探测光脉冲宽度受到限制,布里渊光时域反射仪(BOTDR)在对光纤上的应变进行分布式测量时,空间分辨力只能达到1 m。针对布里渊光时域反射仪单次采样接收背向布里渊散射信号(BBS)需要一定的时间,提出了基于等效脉冲光的多洛仑兹拟合法以提高其应变测量的空间分辨力。该方法将探测光脉冲在布里渊光时域反射仪完成单次采样所需的时间上进行积分,将积分函数作为等效脉冲光的表达式,再根据等效脉冲光的形状将布里渊光时域反射仪接收到的背向布里渊散射谱(BBS)细分,并对它进行多洛仑兹迭代拟合,准确求得每个细分布里渊散射谱的中心频率,进而利用光纤中布里渊频移与应变的对应关系,得到光纤中与细分布里渊散射谱对应的细分光纤单元上的应变情况。实验结果表明,利用这种方法,可使布里渊光时域反射仪应变测量的空间分辨力提高至0.05 m。     

Improvement of packet transmission scheduling and delivery rate in wireless Ad-Hoc networks

The principal purpose of Ad-Hoc wireless networks is to increase service efficiency in terms of transmission scheduling and packet transfer rate. The approaches that assume frame unicity to satisfy a given set of packets minimize the end-to-end delay. However, they do not guarantee a maximum packet delivery rate due to the difficulty of establishing robust paths for packet transfer across nodes deployed in the network, especially in a three-dimensional (3D) environment. The objective is to minimize the end-to-end delay by ensuring the maximum delivery of packets to their destinations. Furthermore, the signal-to-interference-and-noise-ratio (SINR) model is considered to optimize transmission scheduling. In this paper, an optimal node coordinates optimization approach is proposed to extend two recently investigated schemes in the literature (S-RDSP and I-RDSP). The developed algorithms, named S-MPDR and I-MPDR, seek to reduce the end-to-end delay by delivering a collection of inserted packets over a 3D environment while also maximizing the delivery rate of these packets. Desirability functions are used to evaluate the network’s performance in various scenarios involving two different environments, Level 0 and Level 1. Numerical results demonstrate that the developed algorithms outperform both schemes in terms of end-to-end delay and packet delivery rate. In the Level 0 environment, the overall minimum delay and packet delivery rate scores provided by S-MPDR are increased by 28% and 88% compared to S-RDSP, respectively. In comparison, those provided by I-MPDR are increased by 24% and 16% compared to I-RDSP. Similarly, in the Level 1 environment, the scores provided by S-MPDR are increased by 25% and 100% compared to S-RDSP, respectively, while those provided by I-MPDR are increased by 23% and 25% compared to I-RDSP.     

Theory of third-harmonic generation using double half-Gaussian hollow beams and self-phase-matching

We first (to best of out knowledge) use the slowly varying envelope approximation (SVEA) to obtain the equation of third harmonic (TH) generated by focusing the double half-Gaussian hollow beams into an atomic medium. The two-dimension intensity distribution is achieved by simulating, and it is similar to that generated by the 0th order Bessel beams. In addition to the similarities between the experimental setups, we demonstrate the accuracy of the equation. Compared with that generated by the Bessel beams, the pattern of the TH intensity generated by the double half-Gaussian hollow beams has salient features.     

Initial oxidation of Mn surface studied by ultraviolet photoelectron spectroscopy and metastable induced electron spectroscopy

Metastable induced electron spectroscopy (MIES) was combined to ultraviolet photoelectron spectroscopy (UPS) to study the initial steps of manganese oxidation. Oxygen exposure directly led to the formation of MnO with no intermediate states. The MnO feature saturation observed by MIES and UPS techniques showed noticeable differences and proved the formation of several oxide layers. The oxidation kinetics was studied by measuring MnO features by UPS, which depend on the surface coverage by oxygen. We observe a decrease of oxygen adsorption probability with oxygen exposure. Oxidation proceeds by oxygen dissolution into the first layers to form a three-dimension MnO. This hypothesis was confirmed by our work function measurements.     

Phase space density representations in fluid dynamics

Phase space density representations of inviscid fluid dynamics were recently discussed by Abarbanel and Rouhi. Here it is shown that such representations may be simply derived and interpreted by means of the Liouville equation corresponding to the dynamical system of ordinary differential equations that describes fluid particle trajectories. The Hamiltonian and Poisson bracket for the phase space density then emerge as immediate consequences of the corresponding structure of the dynamics. For barotropic fluids, this approach leads by direct construction to the formulation presented by Abarbanel and Rouhi. Extensions of this formulation to inhomogeneous incompressible fluids and to fluids in which the state equation involves an additional transported scalar variable are constructed by augmenting the single-particle dynamics and phase space to include the relevant additional variable.     

Growth of Bi-2212 single crystals by a horizontal Bridgman method using different oxygen pressure

We compared the crystallinity of the Bi-2212 single crystals grown by the horizontal Bridgman (HB) method with those grown by the vertical Bridgman (VB) method in terms of resistivity, ρ. It was clarified that crystals far inside the ingot grown by HB method showed the equivalent crystallinity to crystals grown by VB method, whereas crystals near the surface of the ingot grown by HB method showed the similar crystallinity to crystals grown by TSFZ method, which is sensitive to the growth atmosphere.     

Dispersion compensation for an ultrathin metal film using LCD—CCD system

A dispersion compensation method is introduced to correct the distorted image passing through an ultrathin metal film.An LCD-CCD system is modeled by the back propagation network and used to evaluate the transmittance of the ultrathin metal film.Training samples for the network come from 729 images captured by shooting test patches,in which the RGB values are uniformity distributed between 0 and 255.The RGB value of the original image that will be distorted by the dispersion is first transformed by mapping from the LCD to the CCD,multiplied by the inverse matrix of the transmittance matrix,and finally transformed by mapping from the CCD to the LCD,then the corrected image is obtained.In order to verify the effectiveness of the proposed method,ultrathin aluminum films with different thicknesses are evaporated on glass substrates and laid between the CCD and LCD.Experimental results show that the proposed method compensates for the dispersion successfully.     

Hg2CuTi型Mn2NiGe合金的电子结构、磁性对压力、四方变形的响应

运用基于密度泛函理论的第一性原理方法,研究了Hg2CuTi型 Mn2NiGe合金的电子结构对外加压力的响应以及Mn2NiGe的电子结构、磁性对四方变形的响应．结果表明：i）随着外加压力的增加,因Ni、Mn原子间距的减小而导致杂化程度的增强,使得态密度整体向低能区域移动,同时,态密度幅度整体略有减小;ii）在由奥氏体相到马氏体相的变形中,同样因Ni、Mn原子间距的减小而导致杂化程度的增强,占据态的态密度向低能区域移动,体系的能量降低,同时,成键态向低能方向移动,反键态向高能方向移动,能带变宽,成键作用加强,最终导致在马氏体相中的稳定性增大;iii）在四方变形过程中,Mn2NiGe总磁矩的变化主要由Ni原子磁矩的变化所产生．