关于2024A1液-汽临界性质

考查了冷压Pv为A（δ~6-δ~2）形式物态方召的临界性质，提出了两种修正的Morse势冷压形式，并计算了其临界参数，认为这是一种较合理的形式．分别对电子比热系βm=0和βm≠0计算了液－汽相变平台．     

Combined fit to BABAR and Belle Data on e^＋e^- →φπ^＋π^- and φf0（980）

A combined fit is performed to the BABAR and Belle measurements of the e^＋e^- →φπ^＋π^- and φf0（980） cross sections for center-of-mass energy between threshold and 3.0 GeV. The resonance parameters of the φ（1680） and Y（2175） are determined. The mass is （1681-12^＋10） MeV/c^2 and the width is （221-24^＋34） MeV/c^2 for the φ（1680）, and the mass is （2117-49^＋59） MeV/c^2 and the width is （164-80^＋69） MeV/c^2 for the Y（2175）. This information will shed light on the understanding of the nature of the excited φ and Y states observed in e＋e- annihilation.     

液体的内压和内能的统计热力学理论

利用分布函数理论导出了液体的内能和内压公式。液体的内压和过剩内能可以表示成体积的幂级数形式,其中的系数可以用多体相互作用势和多体径向分布函数表出,它们仅仅与温度有关。讨论了液体仅存在第n次多体相互作用势情的内压和过剩内能的表达式,结果与Egelstaff的微扰理论结果具有相同的形式,不仅给出了相应参数的表达式而且适用于多体相互作用较强的情形,定义了物性参数α（T）和m,得到的液体过剩内能和内压的表达式与Frank实验结果具有相同的形式,其结果不仅给出了参数α（T）和m的表达式,而且指出了Frank的过剩内能和内压公式只适用于参数α（T）和m与体积无关的液体。     

β-Zn3（PO4）2：Mn^2＋，B^3＋长余辉发光材料的性能

采用高温固相法分别合成了β-Zn3（PO4）2：Mn^2＋,B^3＋和不同HBO3含量的β-Zn3（PO4）2：Mn^2＋,B^3＋红色长余辉材料。XRD结果表明,HBO3的加入对于β-Zn2（PO4）2物相的形成和结晶温度并没有显著影响。从不同样品的激发和发射光谱可以看出,HBO,的加入并没有改变其激发和发射光谱位置,而对其强度有一定影响。对于Zn2.85（P1-x/2O4）2：Mn0.15^2＋,Bx^3＋来说,当B3＋加入量为x=0．05时发光强度最强;而对其余辉衰减光谱来说,HBO3的加入明显提高了材料的余辉性能,并且当B^3＋加入量为x=0．1时余辉性能最强,这是由于B^3＋的不等价取代增加了材料中的陷阱而导致的结果。     

非交错网格下三维准稳态激光重熔熔池数值模拟

对三维维稳态激光重熔问题进行数值模拟,模型考虑了熔池内金属液体的流动和换热。在非交错网格下,采用修正的动量插值技术和ＳＩＭＰＬＥ算法求解动量方程。数值结果表明表面张力温度系数δγ／δＴ对熔池内金属液体的流动方式有重要影响。当δγ／δＴ为－３．５×１０＾－６时,熔池中环。当δγ／δＴ为＋３．５×１０＾－４时,与负的表面温度张力系数情形相反,熔池中只存在沿逆时针方向流动的主对流环。通过灰铸铁激光相变硬     

低能O^3＋与H2碰撞电子俘获过程中靶的同位素效应研究

利用全量子的分子轨道强耦合方法，我们研究了基态的O^3＋（2s^22p^2P）与氚分子和氢分子碰撞的电荷转移过程，计算了方位角为45°，能量分别为0．1eV／u，1．0eV／u，100eV／u，500eV／u的单电子俘获的振动分辨的态选择截面及总截面．分子轨道强耦合计算中采用了自旋耦合价带理论计算的三原子分子势能面和径向耦合矩阵元，对体系的电子运动同H2（T2）或H2^＋（T2^＋）的转动和振动之间的耦合，根据能量的不同，分别采用了无限阶的冲量近似或振动冲量近似．结果发现，低能O^3＋与H2碰撞电子俘获过程中靶的同位素效应显著：对不同的同位素靶，单电子俘获的总截面以及振动分辨态选择截面的分布明显不同；入射离子能量越低，同位素效应越显著．     

一般情形下的碰撞积分修正

众所周知,将玻耳兹曼积分应用于等离子体,由于忽略了集体效应,导致积分对数发散。另外,Balescu-Lenard碰撞理论考虑了集体效应,克服了k→0对数发散困难,但又有k→0积分发散。对于等离子体参量g=1/nλD~3《1情形,文[4]已得出克服k→0积分发散的方法。但对g≥1情形,k→0积分发散问题仍未解决。本文改进了粒子分布函数展开求得包括g<1及g≥1在内的一般情形即南k→0与k→0均收敛的碰撞积分。     

类铍离子内壳激发态1s2p^33P^o的俄歇宽度、俄歇分支率和辐射跃迁率计算

采用鞍点变分方法和鞍点复数转动方法，井考虑相对论修正和质量极化效应，计算了类铍内壳激发态1s2p^33P^o的俄歇宽度、俄歇电子能量和俄歇分支率．同时还对1s2p^33P^o态到1s^22p3P^3P^e态（Z=4～10）的振子强度和辐射跃迁率进行了计算，计算结果和其他理论结果和实验数据符合的很好。     

PH，PD分子基态（X^3∑^-）的结构与势能函数

本文采用量子力学从头算方法，运用电相关单双耦合CCSD（T）／6—311＋＋G（3df，2pd）和QCISD（T）／6—311＋＋G（3df，2pd）研究了PH、PD分子基态的结构与势能函数，计算出了这些分子的光谱数据（ωe、ωeχe、Be、αe、De），结果与实验光谱数据吻合较好．这表明上述分子基态的势能函数可用经修正的Murrell-Sorbie＋c6函数来表示．     

同位素取代和碰撞能对N（4S）＋H2反应立体动力学性质的影响

基于Poveda等计算得到的DMBE势能面,运用准经典轨线的方法研究了同位素取代和碰撞能对N（4S）＋H2反应的立体动力学性质的影响．计算并讨论了两矢量k-J’相关分布函数P（θr）,三矢量k—k＇-j’相关分布函数P（φr）,空间分布函数P（θr,φr）,微分反应截面和积分反应截面．研究了碰撞能从25kcal/mol到80kcal/mol变化对三个反应N＋H2,N＋D2和N＋T2的影响．结果表明：分子间同位素和碰撞能均会对反应立体动力学性质产生一定的影响．     

微结构光纤预制棒拉制过程的温度场分布

根据非稳态傅里叶热传导方程及微结构光纤(MSF)预制棒的初始条件和边界条件，建立圆柱形坐标系，推导出MSF预制棒的温度场分布方程.计算结果表明：当MSF预制棒在高温炉内的温度场分布接近热传导稳态分布时的下棒速度为制备MSF的最佳速度，此时高温炉的加热温度可降低到MSF预制棒的软化温度，另外，随着MSF空气填充率的增加，MSF预制棒的下棒速度也应加快. 关键词： 微结构光纤 光纤预制棒 温度场分布 热传导     

微结构光纤制备过程中不同位置空气孔的形变量分析

根据热传导原理，在拉制微结构光纤(MSF)时，在高温区中，MSF预制棒的包层内不同位置加热的温度也不一样，且由表面往中心方向温度逐渐下降，温度梯度随MSF预制棒下棒速度的加快或包层空气填充率的减少而增大.由于材料的表面张力和黏度系数都是温度的函数，因此将MSF预制棒拉细成MSF时，实际所得到的MSF结构，并非是预制棒等比例的缩小，而是温度越高的空气孔形变量越大.为得到符合设计要求的MSF，就必须将MSF预制棒包层空气孔尺寸按温度变化规律设计，从而消除由于加热温度的非均匀性对拉制的MSF包层空气孔所产生的影响.     

Assessment of a Wiener filter synthetic discriminant function for optical correlation

The Wiener filter (WF), which has been used extensively for image restoration and signal processing, is employed for robust optical pattern recognition and classification. The WF is formulated to incorporate the in-class image (to be detected) and the out-of-class noise image (to be rejected) into a single step filter construction. It is compared with the classical matched filter (CMF) and phase-only filter (POF), demonstrating a superior discriminatory capability. The WF is incorporated into a synthetic discriminant function (SDF); correlation results show that it is tolerant to image distortion. With a 30 ° out of plane rotation between training set images, the WF SDF achieves a 100% success rate in discriminating one class of images from another. The CMF SDF and POF SDF fail to achieve 100% discrimination even at rotation increments of 15 °.     

Experimental simulation of hydrodynamic flow noises in an autonomous marine laboratory

The spectral characteristics of turbulent pressure pulsations arising from the flow around an autonomous marine laboratory have been measured. The autonomous marine laboratory is an upgraded Dolphin buoyant device, equipped with modern digital facilities for autonomous recording, which extends the frequency range of the signals under study up to 50–60 kHz. The power spectra and cross spectra of turbulent pressure pulsations have been measured at different points of the measuring section by point pressure transducers 1.3 or 20 mm in diameter at a speed of the autonomous marine laboratory of 8–22 m/s. The measurements have revealed unexpected behavioral features of the spectra (their inflection points) at high frequencies. An analysis is performed to explain these features. In particular, it is shown that the correction function based on the more complex cross spectrum model (in comparison with the Corcos cross spectrum model) developed by Smol’yakov in 2006 predicts a monotonic (without inflection points) decrease in the spectral levels at high frequencies for reconstructed (corrected) spectra.     

An analysis of phonon emission as controlled by the combined interaction with the acoustic and piezoelectric phonons in a degenerate III–V compound semiconductor using an approximated Fermi–Dirac distribution at low lattice temperatures

Compound semiconductors being piezoelectric in nature, the intrinsic thermal vibration of the lattice atoms at any temperature gives rise to an additional potential field that perturbs the periodic potential field of the atoms. This is over and above the intrinsic deformation acoustic potential field which is always produced in every material. The scattering of the electrons through the piezoelectric perturbing potential is important in all compound semiconductors, particularly at the low lattice temperatures. Thus, the electrical transport in such materials is principally controlled by the combined interaction of the electrons with the deformation potential acoustic and piezoelectric phonons at low lattice temperatures. The study here, deals with the problem of phonon growth characteristics, considering the combined scattering of the non-equilibrium electrons in compound semiconductors, at low lattice temperatures. Beside degeneracy, other low temperature features, like the inelasticity of the electron–phonon collisions, and the full form of the phonon distribution have been duly considered. The distribution function of the degenerate ensemble of carriers, as given by the heated Fermi–Dirac function, has been approximated by a simplified, well-tested model. The model which has been proposed earlier, makes it much easier to carry out analytically the integrations without usual oversimplified approximations.     

Generalized synchronization of coupled chaotic systems

In this paper we briefly report some recent developments on generalized synchronization. We discuss different methods of detecting generalized synchronization. We first consider two unidirectionally coupled systems and then two mutually coupled systems. We then extend the study to a network of coupled systems. In the study of generalized synchronization of coupled nonidentical systems we discuss the Master Stability Function (MSF) formalism for coupled nearly identical systems. Later we use this MSF to construct synchronized optimized networks. In the optimized networks the nodes which have parameter value at one extreme are chosen as hubs and the pair of nodes with larger difference in parameter are chosen to create links.     

基于卷积法TV模型的锥束CT散射校正方法

为了解决CT图像中散射伪影问题,提出并使用修正的泊松分布函数作为散射函数,然后利用卷积模型生成多个散射基图像,将基图像与原始重建图像的线性组合作为最终重建图像,最后,通过使重建图像的全变分函数最小求取线性组合系数最优解。该算法具有计算复杂度小、能够灵活应用于不同的成像对象的特点。实验结果表明,算法能够有效抑制散射导致的杯状和黑色带状伪影,提高图像对比度。     

四元量化的综合鉴别函数滤波器实现比例不变相关识别

设计一种基于综合鉴别函数(SDF)的比例不变相关识别滤波器，将频域中被SDF调制的相关输出函数进行复数形式的四元量化（QFCQ），并采用叠代算法调整SDF的系数，使输出的相关峰尖锐，区分能力强，同时满足不同比例图像等相关峰输出的准则，从而达到了比例不变识别的要求.计算机仿真实验对属于训练图像系列的目标图像进行了识别，并与基本的SDF及二元化纯相位SDF做了比较，结果表明该方法具有较好的识别效果.     

Measurement of the space–time interval in modified gravity theories in Palatini formalism

There are strong motivations that lead cosmologists to consider alternatives to Einstein’s theory of gravity in Palatini formalism. In addition, there are two distinguishable local frames in this formalism in which one of them is local inertial frame and the equivalence principle is satisfied. Different features of speed of light such as the causal structure constant, electromagnetic and gravitational wave velocities and Einstein velocity will not coincide in this local inertial frame for extended gravity theories in Palatini formalism. On the other hand, both the measurement of time and exchange of a signal between the distant points are required to determine spatial distances. In a particular situation where these aspects of the speed of light do not coincide, the distance determination will become more demanding because light will follow a time-like geodesic of the metric. In modified gravity theories in Palatini approach, theories involve a varying speed of photon. Therefore these kinds of theories must be based on some other technique of measuring spatial distances than radar or some terms should be corrected in the line element in the proposed model. We found out we should consider a coefficient which is proportional to energy density in each era, in the line element in order to be able to use radar for measuring distance in modified gravity theories in Palatini formalism. Analysis of some observational data will be affected by considering this coefficient in the line element.     

Influence of ultrasound on the kinetic parameters of electrochemical redox reactions

The aim of this work is to determine the Tafel parameters with and without ultrasound. The total overvoltage has been corrected for diffusion by using rotating disk technique and potentiostatic extrapolation to infinite rotating speed. Three well known redox systems have been selected regardless to their different electrochemical behaviour: the quinone-hydroquinone, the Fe(II)Fe(III) chlorides and Fe(II)-Fe(III) cyanide systems. This work shows that the reversibility is higher with ultrasound only in the case of the quinone-hydroquinone system.