腔衰荡吸收多指数模型研究

本文建立了考虑激光线宽影响后腔衰荡的多指数吸收模型，推导出了对数衰荡函数的多项式拟合公式。     

石墨炉原子吸收光谱法测定人体血清铝

本文报导了石墨炉子原子吸收光谱法测定人体血清铝的方法，对各种测定条件进行了探讨，本法简便，快速，准确，并已初步应用于医学临床研究，取得了一定效果。     

光控塞曼石墨炉原子吸收光谱法直接测定血液中硅

本文采用偏振塞曼原子吸收法，血液基体匹配标准，以Ｃａ作基体改进剂直接测定人体全血中痕量硅，既降低了硅原子化温度又提高了硅的测定灵敏度，克服了血液基体的干扰。方法的相对标准偏差小于５．０％，回收率在９５．８－１０６％之间。     

过渡金属原子团簇的电子能谱与吸收光谱

文献〔１〕从理论上阐明了金属原子团簇的公有化电子能谱具有分裂能级的特点，因而其公有化电子具有吸光的特性，并计算了Ｃｕ与Ａｌ的金属原子团簇的吸收光谱。然后，在文献〔２〕中用此理论计算了碱金属原子团簇的电子能谱与吸收光谱。现进一步推广此理论来计算过渡金属原子团簇的电子能谱与吸收光谱。     

湿法灰化火焰原子吸收光谱测定胭脂花中微量锌

本文采用ＨＮＯ３－ＨＣｌＯ４湿灰化法火焰原子吸收光谱测定胭脂花种子，胚乳，叶片和枝中的微量锌，实测了４０多个样品，该法与常规的比色法相比，具有较高的灵敏度和准确度，简化了处理手续，缩短了测定时间，也减少了污染和测定元素处理过程中的损失。检出限为０．０１μｇ．ｇ＾－１。相对标准偏差小于５％，回收率在９５％－１０５％之间。     

碱金属原子团簇的电子能谱与吸收光谱

苟清泉在前文中［１］，从理论上阐明金属原子团簇的公有化电子能谱具有分裂能级的特点，因而具有吸光的特性，并计算了Ｃｕ与Ａｌ的金属原子团簇的吸收光谱。现进一步用此理论计算碱金属团簇的电子能谱与吸收光谱。     

原子吸收光谱法同时测定中草药内五种元素的研究

微量元素Ｃｕ、Ｚｎ、Ｆｅ、Ｍｎ、Ｃｒ是人体所必需的。本文采用火焰原子吸收光谱法同时测定中草药内这五种微量元素。建立了样品的消化方法及介质、基体对测定影响的抑制措施。通过对野生中草药根、茎、叶和植物标准物的测定，确立了方法的可行性，各元素回收率在９１．３％－１０３．７％，相对标准偏差＜１％。     

火焰原子吸收法测定牙膏中的锶

本文阐述了牙膏锶的测定方法，各种类型的牙膏成份较为复杂，宜采用标准加入法。获得满意的精密度，准确度。     

小白鼠组织和骨中铜锌铁钙镁的测定

本实验利用原子吸收光谱法对小白鼠组织及骨中Ｃｕ，Ｚｎ，Ｆｅ，Ｃａ，Ｍｇ含量进行了测定。样品采用浓ＨＮＯ２和ＨＣｌＯ４湿法消化，并用国家计量局的猪肝（ＧＢＷ０８５５１）作为标准物对测定方法进行了考核，测定值与标准值吻合。方法加收率：Ｃｕ９９－１００％，Ｚｎ１０２－１０３％，Ｆｅ９９－１００％，Ｃａ９９－１０４％，Ｍｇ１０１－１０３％，ＣＶ值为１．７－３．９％。方法简便，快速，准确度高，需样量少，符合     

吸收光谱光路的设计与误差

固体、液体和气体物质的吸收光谱是大学普物、光学专业的一个基本实验．如何在普通的设备和实验条件下，较为准确地测量吸收系数？本文从朗伯定律出发，介绍一种“对数测量法”光路．并对实验中出现的“负吸收系数”等误差作了分析．文中还介绍了消除材料样品对探测光的反射误差的固体、液体样品架．     

约束对Birkhoff系统Noether对称性和守恒量的影响

研究约束对Birkhoff系统的Noether对称性和守恒量的影响．首先，建立了Birkhoff系统的运动微分方程．其次，给出了系统Noether对称性的判据．然后，讨论了受约束作用后，Birkhoff系统的Noether对称性发生的变化，并给出了系统的Noether对称性以及守恒量保持不变的条件．最后，举例说明结果的应用． 关键词： 分析力学 Birkhoff系统 约束 Noether对称性 守恒量     

Aerial Video Trackers Review

Target tracking technology that is based on aerial videos is widely used in many fields; however, this technology has challenges, such as image jitter, target blur, high data dimensionality, and large changes in the target scale. In this paper, the research status of aerial video tracking and the characteristics, background complexity and tracking diversity of aerial video targets are summarized. Based on the findings, the key technologies that are related to tracking are elaborated according to the target type, number of targets and applicable scene system. The tracking algorithms are classified according to the type of target, and the target tracking algorithms that are based on deep learning are classified according to the network structure. Commonly used aerial photography datasets are described, and the accuracies of commonly used target tracking methods are evaluated in an aerial photography dataset, namely, UAV123, and a long-video dataset, namely, UAV20L. Potential problems are discussed, and possible future research directions and corresponding development trends in this field are analyzed and summarized.     

亲水性材料固相萃取-紫外导数光谱法检测血中茚满二酮灯抗凝 …

本文报导了血中茚满二酮类抗凝血杀鼠剂敌鼠、氯敌鼠、杀鼠酮的亲水性材料固相萃取－紫外导数光谱检测法。血样用pＨ５缓冲液等体积稀释后加于西雷脱硅藻土柱上,柱用乙酸乙 酯洗脱,将洗脱液挥发干净,剩余物用pＨ１０缓冲液溶解,测定所得溶液的二阶导数光谱进行定性和定量分析。三种杀鼠剂以１０mg／Ｌ的量加于空白血中测得萃取率为８５％以上,血中三种杀鼠剂的检出限低于２ｍｇ／Ｌ。萃取中亲水性硅藻土可用硅胶和氧化铝代替,     

Concurrence and Quantum Discord in the Eigenstates of Chaotic and Integrable Spin Chains

There has been some substantial research about the connections between quantum chaos and quantum correlations in many-body systems. This paper discusses a specific aspect of correlations in chaotic spin models, through concurrence (CC) and quantum discord (QD). Numerical results obtained in the quantum chaos regime and in the integrable regime of spin-1/2 chains are compared. The CC and QD between nearest-neighbor pairs of spins are calculated for all energy eigenstates. The results show that, depending on whether the system is in a chaotic or integrable regime, the distribution of CC and QD are markedly different. On the other hand, in the integrable regime, states with the largest CC and QD are found in the middle of the spectrum, in the chaotic regime, the states with the strongest correlations are found at low and high energies at the edges of spectrum. Finite-size effects are analyzed, and some of the results are discussed in the light of the eigenstate thermalization hypothesis.     

无旋性前进重力波传递在均匀流中的Lagrangen解析解与试验验证Ⅱ.试验验证

针对文献[1]中的无旋性自由表面周期性规则前进重力波传递在均匀流中,本文以与前进波波向同向与反向的均匀流两种特例情况,进行试验测量,所得的波形曲线、流速分布、流体质点的运动轨迹与运动周期及其质量传输速率与Lagrange平均高程等特性,均与文献[1]中全以Lagrange方式所得的三阶解结果符合得很好.这证实本研究取定的标注流体质点的参数,正好为其在原静止水中的位置坐标值.同时亦证实波流场中由流体质点所构成的波形曲线,其波长皆同于(纯)前进波,而其传播速度为(纯)前进波波速与均匀流流速之和是具Doppler效应的;而流体质点的运动周期与其运动周期平均高程、及其质量传输速率扣掉均匀流流速等,都与(纯)前进波的相符.另外,亦揭示出流体质点的运动轨迹,在前进波波向与均匀流同向中,当流体质点在波谷断面处时沿前进波波向的流速分量为反向、零与正向时,则其形状分别为朝波向前进的扁长辐状余摆线、在波谷断面处成尖点朝下的滚轮状线与短辐形余摆线;而在前进波波向与均匀流反向中,当流体质点的质量传输速率为沿前进波波向为正向与零时,则其形状分别为朝波向前进的缩短的扁长辐形余摆线与长轴在前进波波向上椭圆形封闭曲线;而当流体质点的质量传输速率为反前进波波向,但质点在波峰断面处时沿前进波波向的流速分量分别为正向、零与反向时,则其形状分别为反波向前进的倒扁长辐形余摆线、在波峰断面处成尖点朝上的倒滚轮状线与倒短辐形余摆线.     

基于激光的测量技术在燃烧流场诊断中的应用

分析了工业发动机湍流燃烧场诊断的需求和面临的挑战,介绍了燃烧流场组分浓度、温度和速度等主要参数的激光测量技术,给出了其基本原理、在燃烧场诊断中的应用和国内外研究现状,分析了不同技术的特点及其适用性。简介了多参数综合诊断的作用和进展。对目前诊断和测量存在的主要问题和发展趋势进行了探讨。     

Calculated correlations between material parameters and electro-optical performance of twisted nematic displays

Computer calculations of the optical transmission of TN-LCDs as a function of the applied voltage are presented. In particular, the wavelength and angular dependence of half transmission voltages and sharpness of transmission curves are examined. Furthermore the lowest relaxation rates of the linearized dynamical equations, neglecting backflow effects are calculated. The dielectrical anisotropy and the elastic parameters are varied systematically in the calculations over ranges that actually occur in nematics. Although the results are too complex to be condensed in simple general statements they are helpfull in designing optimal nematic mixtures for a given display application.     

基于数值计算的斜流泵级性能改进

采用CFD数值模拟的方法对斜流泵级内部三维紊流流场进行计算,预测了其效率-流量、扬程-流量特性,并与实验结果进行了对比验证。根据得到的流场结果,通过斜流泵级水力尺寸改进-数值模拟分析的循环工作,在最终改进的斜流泵级预测流场中减少了泵内流场的漩涡运动,避免了出口回流的产生,削弱了叶顶间隙泄漏涡,提高了斜流泵级的效率,改进了能量特性,得到了斜流泵级改进前后流场与效率的对比。     

Cylindrical-confinement-induced phase behaviours of diblock copolymer melts

The phase behaviours of diblock copolymers under cylindrical confinement are studied in two-dimensional space by using the self-consistent field theory. Several phase parameters are adjusted to investigate the cylindrical-confinement-induced phase behaviours of diblock copolymers. A series of lamella-cylinder mixture phases, such as the mixture of broken-lamellae and cylinders and the mixture of square-lamellae and cylinders, are observed by varying the phase parameters, in which the behaviours of these mixture phases are discussed in the corresponding phase diagrams. Fur-thermore, the free energies of these mixture phases are investigated to illustrate their evolution processes. Our results are compared with the available observations from the experiments and simulations respectively, and they are in good agreement and provide an insight into the phase behaviours under cylindrical confinement.     

Kinetics and equilibrium of adsorption of organic solutes on mesoporous carbons

Static and kinetic studies on adsorption of nitrobenzene, 4-nitrophenol and 4-chlorophenol on two mesoporous carbons are performed. The carbon properties are analyzed by means of nitrogen adsorption. The adsorption experiments are performed in acidic buffer solutions in a wide range of concentrations. The static experiments are analyzed by means of Langmuir-Freundlich and Freundlich isotherms. The Lagergren, pseudo-second-order, intraparticle-diffusion and multi-exponent equations are used in the analysis of kinetic equilibria.