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Linear Analyses of langmuir and EM Waves in Relativistic Hot Plasmas

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Communications in Theoretical Physics 2018年第11期69卷 609-612页

作者： Qiang-Lin Hu Xiao-Bin Luo Gui-Lan Xiao Wen Hu Ji-Chang Peng Shen-Lin Zhou Department of Physics Jinggangshan University Library Jinggangshan University

The linear langmuir and electromagnetic (EM) waves in relativistic hot plasmas are discussed, and the dispersion relations are obtained based on the covariant Maxwell's and fluid equations. When k_BT/mc^2> 1, the effective mass of electrons will be increased obviously. As the results, many other influences are induced, such as the decrease of the plasmas frequency and the critical frequency, the reduction of the electron sound velocity and the electrons' oscillation velocity, and so on. Numerical results show that these influences can affect the dispersion relations of langmuir and EM waves seriously even in linear regime.

关键词： relativistic hot plasmas langmuir wave electromagnetic wave dispersion relation

STUDIES　ON　THE　AGGRESGATION　BEHAVIOUR　OF　A　SIDE－CHAIN　LIQUID　CRYSTALLINE　POLYMER　IN　langmuir－BLODGETT　FILMS

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Chinese Chemical Letters 1996年第4期7卷 371-374页

作者： Xiao CHEN Qing Bin XUE KongZhang YANG and Qi Zhen ZHANG(Institute of Colloid and Interface Chemistry, Shandong University, Jinan, 2501OO)(￣+Department of Chemistry, Shandong University, Jinan, 250100) Inst. of Colloid and Interface Chem. Shandong University Jinan 250100 Department of Chemistry Shandong University Jinan 250100

be aggregation behavior of a side chain liquid crystaline polymer (PSLC) has been investigated by means of surface pressure-area isotherm, TEM and SEM observation X-ray diffraction, and UV-vis spectroscopy. Resulte o... 详细信息

关键词： SIDE CHAIN AGGRESGATION BEHAVIOUR CRYSTALLINE FILMS langmuir LIQUID OF POLYMER

斜入射非线性电离层langmuir扰动的电磁波传播特性

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物理学报 2022年第6期71卷 123-131页

作者：杨利霞刘超李清亮闫玉波安徽大学电子信息工程学院合肥230031 安徽大学信息材料与智能感知安徽省实验室合肥230031 中国电波传播研究所电波环境特性及模化技术重点实验室青岛266107

基于广义Zakharov模型,结合斜入射等离子体的时域有限差分(FDTD)方法与双流体力学方程,通过由二维麦克斯韦方程等价转换的一维麦克斯韦方程,与等离子体流体力学方程建立了一个电磁波以不同角度入射电离层传播的数值模型.分析推导出TEz... 详细信息

基于广义Zakharov模型,结合斜入射等离子体的时域有限差分(FDTD)方法与双流体力学方程,通过由二维麦克斯韦方程等价转换的一维麦克斯韦方程,与等离子体流体力学方程建立了一个电磁波以不同角度入射电离层传播的数值模型.分析推导出TEz波在斜入射非线性电离层等离子体的支配方程,然后推导了适用于计算电离层电磁波传播特性的FDTD算法.通过仿真来证明该方法在较小倾角下,电磁波对电离层加热形成langmuir扰动及其传播特性的准确性和有效性.结果表明,在小角度入射下,大功率高频电磁波在电离层等离子体中的O波反射点附近激发出了langmuir波,同时波粒相互作用导致O波转换为Z波并向电离层更高区域传播.本文进一步研究了基于电离层等离子体的电磁波传播特性,为全面深入分析电离层langmuir扰动对电离层电波传播特性影响奠定数值算法的基础.

关键词：时域有限差分方法 Zakharov 方程斜入射 langmuir 扰动

Automated electron temperature fitting of langmuir probeⅠ-Ⅴtrace in plasmas with multiple Maxwellian EEDFs

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Plasma Science and Technology 2020年第8期22卷 109-119页

作者： Chi-Shung YIP Wei ZHANG Guosheng XU Noah HERSHKOWITZ Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Department of Engineering Physics University of Wisconsin—MadisonMadisonWI 53706United States of America

An algorithm for automated fitting of the effective electron temperature from a planar langmuir probe I-V trace taken in a plasma with multiple Maxwellian electron populations is developed through MATLAB *** code automatically finds a fitting range suitable for analyzing the temperatures of each of the electron *** algorithm is used to analyzeⅠ-Ⅴtraces from both the Institute of Plasma Physics Chinese Academy of Sciences's Diagnostic Test Source device and a similar multi-dipole chamber at the University of Wisconsin-Madison.Ⅰ-Ⅴtraces reconstructed from the parameters fitted by the algorithm not only agree with the measured I-V trace but also reveal physical properties consistent with those found in previous *** probe traces are also analyzed with the algorithm and it is shown that the major source of error in such attempts is the disruption of the inflection point due to both decreased signal-to-noise ratio and greater sheath *** is thus recommended to use planar probes with radii much greater than the plasma Debye length when signal-to-noise ratio is poor.

关键词： EEDF langmuir probes plasma diagnostics

Soliton and bound-state soliton mode-locked fiber laser based on a MoS_2/fluorine mica langmuir–Blodgett film saturable absorber

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Photonics Research 2019年第4期7卷 431-436页

作者： RUIDONG Lü YONGGANG WANG JIANG WANG WEI REN LU LI SICONG LIU ZHENDONG CHEN YONGFANG LI HONGYING WANG FUXING FU School of Physics and Information Technology Shaanxi Normal University School of Science Xi'an Institute of Posts and Telecommunications Key Laboratory for Surface Engineering and Remanufacturing of Shaanxi Province Xi'an University

In this article, we report on an experimentally generated soliton and bound-state soliton passively mode-locked erbium-doped fiber laser by incorporating a saturable absorber(SA) made of MoS2∕fluorine mica(FM) that was fabricated with the langmuir–Blodgett(LB) method. The FM substrate is 20 μm thick and easy to bend or cut,like a polymer. However, it has a higher damage threshold and a better thermal dissipation than *** addition, the LB method can be used to fabricate a thin film with good uniformity. In this study, the modulation depth, saturable intensity, and unsaturated loss of the SA are measured as 5.9%, 57.69 MW∕cm2, and13.4%, respectively. Based on the SA, a soliton mode-locked laser is achieved. The pulse duration, repetition rate, and signal-to-noise ratio are 581 fs, 15.67 MHz, and 65 dB, respectively. By adjusting the polarization controller and pump power, we obtain a bound-state soliton mode-locked pulse. The temporal interval between the two solitons forming the bound-state pulse is 2.7 ps. The repetition rate of the bound-state pulses is proportional to the pump power. The maximum repetition rate is 517 MHz, corresponding to the 33 rd harmonic of the fundamental repetition rate. The results indicate that the MoS2∕FM LB film absorber is a promising photonic device in ultrafast fiber lasers.

关键词： langmuir mica controller pulse MoS2 pump is was

langmuir films stability phenomenon of glycerol dialkyl nonitol tetraether at the air-water interface for variations spreading time

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Advances in Biological Chemistry 2012年第3期2卷 233-237页

作者： Sri Vidawati Udo Bakowsky Ulrich Rothe Department of Pharmaceutical Technology Philipps University Marburg Marburg Germany Department of Physics Faculty of Natural Science and Mathematics University Indonesia Depok Indonesia Institute of Physiological Chemistry Faculty of Medicine University Halle-Wittenberg Halle/Saale Germany

langmuir films behavior of asymmetric glycerol dialkyl nonitol tetraether (GDNT) lipids at the air-water interface (temperature 19℃ ± 1℃) investigated the stability of the mean ratio of langmuir films for different spreading time prior to the transfer film. Floating monolayer films stability is an important parameter to obtain high-quality langmuir-Blodgett films for their aplications. Hysteresis loop of the compression-decompression (μ-A) isotherms of langmuir film GDNT used to analyze the thermodynamic stability of the monolayer films and its features. langmuir films stability of tetraether lipid GDNT shown more stable at the time of spreading longer than a short time.

关键词： Asymmetric Glycerol Dialkyl Nonitol Tetraether Lipid Surface Pressure-Area Isotherm langmuir Films Stability Hysteresis Loop

langmuir吸附等温线方程的改进及其在沸石吸附重金属中的应用

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有色金属（冶炼部分） 2020年第4期 84-92页

作者：张晓陈晨程婷王津南叶晨昊邓琴江苏开放大学环境生态学院南京210017 南京大学盐城环保技术与工程研究院江苏盐城224005 江苏科技大学环境与化学工程学院江苏镇江212018 南京大学污染控制与资源化国家重点实验室南京210093

从试验数据分析出发,基于经典langmuir吸附等温线方程,通过引入虚拟重金属离子和平衡吸附面积分配参数的概念,并将传统的平衡吸附量概念转化为平衡吸附面积,成功建立了可用于分析重金属离子在沸石材料上多元吸附过程的改进式半经验吸附... 详细信息

从试验数据分析出发,基于经典langmuir吸附等温线方程,通过引入虚拟重金属离子和平衡吸附面积分配参数的概念,并将传统的平衡吸附量概念转化为平衡吸附面积,成功建立了可用于分析重金属离子在沸石材料上多元吸附过程的改进式半经验吸附等温线方程和数据分析方法,并应用到重金属元素(Cu、Pb、Cd、Ni)在合成沸石上的吸附过程,结果令人满意。方程拟合结果表明:在一元吸附体系下,四种重金属离子的极限吸附面积顺序依次为Ni^2+>Cu^2+>Pb^2+>Cd^2+。在多元吸附体系中,由于重金属离子间的相互干扰,重金属离子的总极限吸附面积均小于各重金属离子在一元吸附体系下的极限吸附面积之和。在任何多元吸附系统中,无论初始浓度高低,Cu离子均占有吸附面积分配的优势,且随着初始浓度的增加其优势愈加明显或至少保持相对稳定。Pb离子的竞争优势主要体现在较高初始浓度,并且也随着初始浓度的增加而增加。Cd离子和Ni离子的优势地位则主要体现在较低初始浓度,且随着初始浓度的增加而逐步降低。

关键词： langmuir 半经验式改进吸附等温线多元吸附重金属沸石

langmuir探针诊断微波ECR非平衡磁控溅射等离子体

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真空科学与技术学报 2005年第2期25卷 110-114页

作者：张治国陈小锰刘天伟徐军邓新禄董闯大连理工大学三束材料改性国家重点实验室大连116024

利用朗谬尔探针诊断了ECR非平衡磁控溅射等离子体,给出了微观等离子体参量随宏观工艺参量变化关系。实验测得基片架附近等离子体密度达到1010～1011数量级,电子温度在(5～10)eV之间。随溅射靶功率变化,等离子体密度在130W时取得最大值;... 详细信息

利用朗谬尔探针诊断了ECR非平衡磁控溅射等离子体,给出了微观等离子体参量随宏观工艺参量变化关系。实验测得基片架附近等离子体密度达到1010～1011数量级,电子温度在(5～10)eV之间。随溅射靶功率变化,等离子体密度在130W时取得最大值;同样随微波源功率变化,等离子体密度在功率为850W时也达到最大值。电子温度、等离子体空间电位变化与等离子体密度呈相同趋势。

关键词：非平衡磁控溅射 langmuir 探针诊断 ECR 等离子体密度等离子体参量电子温度功率变化变化关系电位变化最大值工艺参数量级溅射靶微波源片架

The MAVEN langmuir Probe investigation of the thermal electron structure in the Martian ionosphere

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The MAVEN Langmuir Probe investigation of the thermal electr...