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Plasmon Induced Heat Funneling from Au to Cu in the Bimetallic Au@Cu Core-Shell Nanoparticles
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作者 Danli Shi Jingyi Yang +5 位作者 Minjie Li Jianchang Lv Xi Liu Ao Liu Shaoshi Guo Yan Wan 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2024年第4期522-530,I0061-I0066,I0094,共16页
The bimetallic nanostructures that mix a plasmonic metal with a transition metal in the form of the core-shell nanoparticles are promising to promote catalytic performance.But it is still unclear how the heat(hot elec... The bimetallic nanostructures that mix a plasmonic metal with a transition metal in the form of the core-shell nanoparticles are promising to promote catalytic performance.But it is still unclear how the heat(hot electrons and phonons)transfers on the interface between two metals.We have designed and synthesized Au@Cu bimetallic nanoparticles with Au as core and Cu as shell.By using transient absorption spectroscopy,we find that there are two plasmon induced heat funneling processes from Au core to Cu shell.One is the electron temperature equilibrium(electron heat transfer)with equilibration time of~560 fs.The other is the lattice temperature equilibrium(lattice heat transfer)with equilibration time of~13 ps.This plasmon induced heat funneling may be universal in similar bimetallic nanostructures,so our finding could contribute to further understanding the catalytic mechanism of bimetallic plasmonic photothermal catalysis. 展开更多
关键词 PLASMON Transient absorption Bimetallic nanoparticle
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Laser Flash Photolysis Mechanism of Anthraquinone-2-Sodium Sulfonate in Pyridine Ionic Liquid/Water Mixed System
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作者 朱光来 张良伟 +3 位作者 刘艳成 崔执凤 许新胜 吴国忠 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2016年第1期140-146,I0003,共8页
The photochemical reaction process of anthraquinone-2-sodium sulfonate (AQS) in the mixture of water (H2O) and N-butylpyridinium tetrafluoroborate ([BPy] [BF4]) was studied using the laser flash photolysis techn... The photochemical reaction process of anthraquinone-2-sodium sulfonate (AQS) in the mixture of water (H2O) and N-butylpyridinium tetrafluoroborate ([BPy] [BF4]) was studied using the laser flash photolysis technique. Experimental results show that the excited triplet of AQS (3AQS*) could react rapidly with H2O and the transient absorption spectra greatly changed by increasing the volume fraction of the ionic liquid (VIL) in [BPy][BF4]/H2O mixtures. The absorbance at 510 nm increased gradually with increasing VIL when 0〈VIL〈0.1. By contrast, the absorbance decreased gradually when VIL〉0.1. Otherwise, the absorbance of the band near 380 nm steadily increased. The apparent kinetic parameters of transient species B and ^3AQS* are obtained approximately. 3AQS* abstracting hydrogen from [BPy]+ was also explored. It was deduced that the 350-420 nm band was the superposition of the peaks of 3AQS* and AQSH'. The two reactions of 3AQS* with [BPy][BF4] and H2O are a pair of competitive reactions. We also concluded that the entire reaction processes slow down in the case of high [BPy] [BF4] concentrations. 展开更多
关键词 Laser flash photolysis Anthraquinone-2-sodium sulfonate Ionic liquids Tran- sient absorption Hydrogen abstraction
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神奇的物质新态与社会变迁
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作者 朱红 陈礼生 《新纪实·学校体音美》 2020年第7期180-180,共1页
人类生存的世界,是一个物质的世界。过去,人们只知道物质有三态,即气态、液态和固态。20世纪中期,科学家确认物质有第四态,即等离子体态(Plasma),另外,科学巨匠爱因斯坦在70多年前预言的一种新物态,后来在l995年,被美国标准技术研究院... 人类生存的世界,是一个物质的世界。过去,人们只知道物质有三态,即气态、液态和固态。20世纪中期,科学家确认物质有第四态,即等离子体态(Plasma),另外,科学巨匠爱因斯坦在70多年前预言的一种新物态,后来在l995年,被美国标准技术研究院和美国科罗拉多大学的科学家组成的联合研究小组,研究创造出物质的第五态,叫作“玻色——爱因斯坦凝聚态”,2004年1月29日,还是这个研究小组又宣布,他们创造出了物质的第六种形态:费米子凝聚态(Fermionic Condensate)。 展开更多
关键词 物质世界 离子体态
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Representation of Phase Behavior of Ionic Liquids Using the Equation of State for Square-well Chain Fluids with Variable Range 被引量:5
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作者 李进龙 何清 +2 位作者 何昌春 彭昌军 刘洪来 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第6期983-989,共7页
An equation of state (EOS) for square-well chain fluids with variable range (SWCF-VR) developed based on statistical mechanics for chemical association was employed for the calculations of pressure-volume-temperat... An equation of state (EOS) for square-well chain fluids with variable range (SWCF-VR) developed based on statistical mechanics for chemical association was employed for the calculations of pressure-volume-temperature (pVT) and phase equilibrium of pure ionic liquids (ILs) and their mixtures. The new molecular parameters for 23 ILs were obtained by fitting their experimental density data over a wide temperature and pressure ranges. The mo- lecular parameters of ILs composed of homologous organic cation and an identical anion such as [Cxmim][NTf2] are good linear with respect to their molecular weight, indicating that the molecular parameters of homologous substances, subsequently p VT and vapor-liquid equilibria vapor-liquid equilibria (VLE) can be predicted using the generalized parameter when no experimental data were available. The new set of parameters were satisfactorily used for calculations of the property of solvent and ILs mixture and the solubility of gas in various ILs at low pressure only using one temperature-independent binary interaction parameter. 展开更多
关键词 equation of state ionic liquids square-well chain phase behavior
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Study on Bombyx mori silk treated by oxygen plasma 被引量:1
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作者 陈宇岳 林红 +2 位作者 任煜 王红卫 朱良均 《Journal of Zhejiang University Science》 EI CSCD 2004年第8期918-922,共5页
Study of the morphology, aggregation structure and properties ofBombyx mori silk treated by low temperature oxygen plasma showed that slight flutes appeared on the surface of Bombyx mori silk fiber and that its surfac... Study of the morphology, aggregation structure and properties ofBombyx mori silk treated by low temperature oxygen plasma showed that slight flutes appeared on the surface of Bombyx mori silk fiber and that its surface structure changed after plasma treatment. The conformation also changed and crystalline degree decreased. The stannic filling rate of treated fiber was improved. Because of etching, the weight of the fiber decreased but the breaking strength changed little after short-time treatment. 展开更多
关键词 Oxygen plasma Bombyx mori silk MORPHOLOGY STRUCTURE PROPERTIES
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PLASMA RESISTIN LEVELS AND SINGLE-NUCLEOTIDE POLYMORPHISMS IN RESISTIN GENE 5 FLANKING REGION IN PATIENTS WITH STROKE 被引量:3
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作者 Xing-jian Lin Ying-dong Zhang Qing-shan Guan Qing Di Jing-ping Shi Wei-guo Liu 《Chinese Medical Sciences Journal》 CAS CSCD 2007年第1期27-32,共6页
Objective To analyze the role of resistin in insulin resistance (IR) through investigating the variation of plasma resistin levels and single-nucleotide polymorphisms (SNPs) in resistin gene 5’ flanking region in str... Objective To analyze the role of resistin in insulin resistance (IR) through investigating the variation of plasma resistin levels and single-nucleotide polymorphisms (SNPs) in resistin gene 5’ flanking region in stroke patients.Methods In 103 atherothrombotic cerebral infarction (ACI) patients, 85 lacunar infarction (LI) patients, 70 intracerebral hemorrhage (ICH) patients, and 86 healthy controls, plasma resistin and insulin levels were measured by ELISA , SNPs in resistin gene 5’ flanking region were detected by PCR and direct DNA sequencing. The subjects’ body height and weight, the body mass index, quantitative insulin sensitivity check index (QUICKI), blood pressure, and the concentration of fasting plasma glucose, triglyceride, total cholesterol, creatinine, low-density lipoprotein, and high-density lipoprotein were also determined. Results QUICKI was significantly lower in the ACI and ICH patients (0.316±0.037 and 0.309±0.032, respectively) than that in the controls (0.342±0.043, P<0.001), while plasma resistin level was significantly higher in the ACI and ICH patients (6.36±3.79 and 7.15±4.27 ng/mL, respectively) than that in the controls (5.28±2.56 ng/mL, P<0.05), but such difference was not observed in the LI patients compared with controls. There was a statistically negative correlation between plasma resistin level with QUICKI (r=-0.228, P<0.001). The distributions of allele and genotype frequencies of resistin gene -420C>G and -537A>C SNPs were not significantly different among the different groups, and those SNPs were not correlated with other clinical and biochemical parameters.Conclusions Plasma resistin is associated with stroke by participating in the development of IR. The SNPs in resistin gene 5’ flanking region has no impact on the plasma resistin level. 展开更多
关键词 RESISTIN insulin resistance single-nucleotide polymorphisms STROKE
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Theoretical Study of Reaction Paths and Transition States on Conversion Methane into C_2 Hydrocarbons Through Plasma 被引量:2
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作者 王保伟 杨恩翠 +1 位作者 许根慧 郝金库 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2007年第1期44-50,共7页
The direct synthesis of C2 hydrocarbons (ethylene, acetylene and ethane) from methane is one of the most important task in C1 chemistry. Higher conversion of methane and selectivity to C2 hydrocarbons can be real-iz... The direct synthesis of C2 hydrocarbons (ethylene, acetylene and ethane) from methane is one of the most important task in C1 chemistry. Higher conversion of methane and selectivity to C2 hydrocarbons can be real-ized through plasma reaction. In order to explore the reaction process and mechanism, the possible reaction paths (1)—(4) were proposed on coupling reaction of methane through plasma and studied theoretically using semi-PM3 method [PM3 is parameterization method of modified neglect of diatomic overlap (MNDO)] including determining the transition state, calculating the activation energy and thermodynamic state functions and analyzing the bond or-der and intrinsic reaction coordinate. The reaction heat results indicate that the reactions (2) and (4) are exothermic, while reactions of (1) and (3) are endothermic. The activation energy results show that activation energy for reac-tions (1) and (2) was much lower than that of reaction paths (3) and (4). Therefore, paths (1) and (2) is the favorable reaction path energetically. More interestingly by comparing the intrinsic reaction coordinated (IRC) of the reaction paths (1) and (2), it is found that the variations of bond lengths in reaction path (1) has a crucial effect on the poten-tial energy, while in reaction path (2), the adjustment of the system geometry also contributes to the whole potential energy of the system. 展开更多
关键词 reaction path transition state METHANE PLASMA PM3
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Volume Effect of Bound States in Quark-Gluon Plasma
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作者 MAIO Hong GAO Chong-Shou ZHUANG Peng-Fei 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第6X期1040-1046,共7页
Bound states, such as qq and q^-q, may exist the volume of the bound states may evoke a reduction in investigate qualitatively the volume effect on the properties states start to be completely melted.
关键词 QGP equationof state DIQUARK bag model volume effect
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Ionic Charge State Distribution of Au Plasma for 7-Ion System
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作者 CHENG Ke ZHU Zheng-He +2 位作者 TANG Chang-Hua TANG Yong-Jian FU Yi-Bei 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第2期353-356,共4页
The present work extends the previous work^[2] on 5-ion system to consider 7-ion system (i.e., Au^47+ -Au^53+). It is found that more highly charged ions, e.g., Au^53+, Au^54+ etc., could be able to be neglected... The present work extends the previous work^[2] on 5-ion system to consider 7-ion system (i.e., Au^47+ -Au^53+). It is found that more highly charged ions, e.g., Au^53+, Au^54+ etc., could be able to be neglected, however, less highly charged ions, e.g., Au^47+, Au^46+ etc., are rather important. Therefore, a new idea to consider 8-ion system, i.e., Au^46+ - Au^53+, is under way. As a supplement, we discuss the simultaneous reaction, which would be important in this sort of works. 展开更多
关键词 Au plasma 7-ion system simultaneous reaction process
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Getting Free Heat Energy Based on Cavitation and Nuclear Fusion according to Revinov's Pilot Plants
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作者 Daurenbek Azenuly AUBAKIR 《Journal of Physical Science and Application》 2016年第3期44-54,共11页
In this report, the author describes and compares two innovative processes for producing thermal energy based on cavitation and nuclear fusion reactions in the indoor environment. Experiments conducted in the laborato... In this report, the author describes and compares two innovative processes for producing thermal energy based on cavitation and nuclear fusion reactions in the indoor environment. Experiments conducted in the laboratory IHS (Intensive Heating System) of IE "Revinov N. M." indicate that the process of lasso-vortex cavitation, which generates by means of an electric arc obtained HV-EI, gas-liquid plasma state in the EHH-CTC (electro-hydraulic heater with cavitation thermal camera) is not inferior and sometimes even superior in heat transfer to NF-AC (nuclear fusion reactions in ambient conditions). 展开更多
关键词 Free energy lasso-vortex cavitation electric arc gas-liquid plasma electro-hydraulic heater cold nuclear fusion inambient conditions.
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High Density Plasma Nitriding of Al-Cu Alloys for Automotive Parts
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作者 Tatsuhiko Aizawa Shinji Muraishi Yoshio Sugita 《Journal of Physical Science and Application》 2014年第4期255-261,共7页
Duralumin alloys have been utilized as structural components and parts for aircrafts, train-cars and so forth. Their high specific strength was attractive to those applications; however, their little corrosion resista... Duralumin alloys have been utilized as structural components and parts for aircrafts, train-cars and so forth. Their high specific strength was attractive to those applications; however, their little corrosion resistance and low wear endurance became a fatal demerit in practical applications. In order to overcome these issues of high strength aluminum alloys, high density plasma nitriding is proposed as an effective surface treatment for duralumin. This process has a capability to control the RF- and DC-plasmas independently for nitriding. This enables us to temporally control and describe the plasma state by in-situ plasma diagnosis. This plasma diagnosis was instrumented to search for optimum processing condition to plasma nitriding the duralumin alloys of type A2011. Both type A2011 aluminum alloy plates and pipes were employed to describe the inner nitriding behavior for hardening the duralumin alloys by the present plasma nitriding. 展开更多
关键词 Duralumin alloys A2011 high density plasma nitrding AIN precipitation HARDENING PLATES PIPES heat sink.
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Two Schemes for Generation of Entanglement for Vibronic Collective States of Multiple Trapped Ions
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作者 YANG Wen-Xing LI Jia-Hua ZHNG An-Shou 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第3期421-426,共6页
We propose two schemes to prepare entanglement for the vibronic collective states of multiple trapped ions. The first scheme aims to generating multipartite entanglement for vibrational modes of trapped ions, which on... We propose two schemes to prepare entanglement for the vibronic collective states of multiple trapped ions. The first scheme aims to generating multipartite entanglement for vibrational modes of trapped ions, which only requires a single laser beam tuned to the ionic carrier frequency. Our scheme works in the mediated excitation regime, in which the corresponding Rabi frequency is equal to the trap frequency. Beyond their fundamental importance, these states may be of interest for experimental studies on decoherence since the present scheme operates in a fast way. The second scheme aims to preparing the continuous variable multimode maximal1y Greenberger-Horne-Zeilinger state. The distinct advantage is that the operation time is only limited by the available laser intensity, not by the inherent mechanisms such as off-resonant excitations. This makes it promising to obtain entanglernent of multiple coherent and squeezing states with desired amplitudes in a reasonable time. 展开更多
关键词 multipartite entanglement GHZ state trapped ions
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Promoting Effects of Pt on the Catalytic Performance of Supported NiB Amorphous Alloy Catalysts for Benzene Hydrogenation 被引量:6
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作者 SONG Hua WU Xianchun +1 位作者 WANG Huaiyuan LI Feng 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第4期698-702,共5页
A support(denoted AM) was prepared using pseudo-boehmite and mordenite.Ni-B and NiPtB amorphous catalysts were prepared on the support by the impregnation method followed by chemical reduction with a KBH4 solution.And... A support(denoted AM) was prepared using pseudo-boehmite and mordenite.Ni-B and NiPtB amorphous catalysts were prepared on the support by the impregnation method followed by chemical reduction with a KBH4 solution.And the catalysts were characterized by X-ray diffraction(XRD),environment scanning electron microscope(ESEM),inductively coupled plasma(ICP),H2-temperature programmed reduction(H2-TPR),differential thermal analysis(DTA),and BET.Benzene hydrogenation was used as a probe reaction to evaluate the effect of addition of small quantities of Pt on the NiB/AM catalyst.The results show that Pt can promote the reduction of NiO and the formation of active sites,leading to smaller catalyst particles and better dispersion of active metal particles on the support.The catalytic activity,sulfur resistance and thermal stability were remarkably improved by Pt doping of the NiB/AM catalyst. 展开更多
关键词 NiB amorphous alloy benzene hydrogenation Pt doping sulfur resistance
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New ab initio Potential Energy Surfaces for Cl(^2P3/2,^2P1/2)+H2 Reaction
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作者 Bin Jiang Dai-qianXie 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2009年第6期601-604,J0001,共5页
New global three dimensional potential energy surfaces for the Cl+H2 reactive system have been constructed using accurate multireference configuration interaction calculations with a large basis set. The three lowest... New global three dimensional potential energy surfaces for the Cl+H2 reactive system have been constructed using accurate multireference configuration interaction calculations with a large basis set. The three lowest adiabatic potential energy surfaces correlating asymptotically with Cl(^2p)+H2 have been transformed to adiabatic representation, which leads to a fourth coupling potential for non-linear geometries. In addition, the spin-orbit coupling surfaces have also been computed using the Breit-Pauli Hamiltonian. Properties of the new potential are described. Reaction dynamics based on the new potential agrees with the recent experimental results quite well. 展开更多
关键词 Potential energy surface Multi-reference configuration interaction Spin-orbit coupling Non-adiabatic effect
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Structure of Macro- and Trace Elements Status Observed in Residents of Magadan Town
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作者 Lugovaya Elena Stepanova Evgenia 《Journal of Life Sciences》 2014年第9期794-797,共4页
The authors aimed the study at examining macro- and trace elements content in elderly people of the 1 period of middle age (21-35) residing in Magadan town to assess the content of 25 trace elements in hair samples ... The authors aimed the study at examining macro- and trace elements content in elderly people of the 1 period of middle age (21-35) residing in Magadan town to assess the content of 25 trace elements in hair samples on individual and population levels by atom-emission spectrometry with inductively-bonded argon plasma. It turned out that the majority of surveyed subjects were characterized by deformation of element status demonstrated by excess and deficit of the basic essential elements of different degrees of manifestation. Deficit of Co (68% of surveyed people), Mg (67%), Ca (64%), Cu (47%), K (46%), Zn (44%), I (41%), Na (33%), P (27%) and Se (24%) was typical for female subjects as well as excess of Si (28%), Zn (22%) and P (20%). Male residents were characterized by deficit of Co (81%), Ca (66%), Mg (65%), I (50%), Cu (37%), K and Na (27%) and excess of Zn (41%). In individual cases it was noted excess concentration of nominally essential and toxic elements in both examined groups. They were: A1, As, Cd, Li, Ni, Pb, Sn, V and B. While analyzing of medians of chemical concentration it was stated reliable sex-related differences (P 〈 0.05): content of Ca, Mg and Mn was higher in hair samples of women, and content of As, B, Cd, Cr, K, Li, Na, P, Pb and V, on the contrary, was higher in male samples. 展开更多
关键词 Macro- and trace elements misbalance the North MEN women.
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Comparison of Structures and Properties between Wool and Ramie Fibers Treated by Atmospheric Pressure Ar and Ar/O_2 Plasma
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作者 王越平 徐向宇 +4 位作者 王守国 张晓丹 赵伶利 史丽敏 高绪珊 《Journal of Donghua University(English Edition)》 EI CAS 2009年第2期216-220,共5页
The technique of atmospheric pressure plasma is of value in textile industry.In this paper,argon(Ar)and argon/oxygen(Ar/O2)atmospheric pressure plasma were used to treat wool and ramie fibers.The structures and proper... The technique of atmospheric pressure plasma is of value in textile industry.In this paper,argon(Ar)and argon/oxygen(Ar/O2)atmospheric pressure plasma were used to treat wool and ramie fibers.The structures and properties of treated fibers were investigated by means of SEM,XPS,single fiber tensile tester and so on.The results proved that the effects of plasma treatments depended on structural characteristics of fibers to a great extent,besides conditions of plasma treatment.By atmospheric pressure plasma treatment,wool fiber had significant changes in morphology structure,surface chemical component,mechanic properties and dyeability,while ramie fiber just showed a little change.In additional,Ar/O2 plasma showed more effective action than argon.And at the beginning of treatment,plasma brought about remarkable effects,which did not increase with prolonging of treat time. 展开更多
关键词 atmospheric pressure plasma Ar plasma Ar/ O2 plasma wool fiber ramie fiber structuralcharacteristic property
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A Group Contribution Method for the Correlation of Static Dielectric Constant of Ionic Liquids
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作者 周颖 林真 +2 位作者 吴可君 徐国华 何潮洪 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第1期79-88,共10页
Static dielectric constant is a key parameter to estimate the electro-viscous effect which plays important roles in the flow and convective heat transfer of fluids with ions in microfluidic devices such as micro react... Static dielectric constant is a key parameter to estimate the electro-viscous effect which plays important roles in the flow and convective heat transfer of fluids with ions in microfluidic devices such as micro reactors and heat exchangers.A group contribution method based on 27 groups is developed for the correlation of static dielectric constant of ionic liquids in this paper.The ionic liquids considered include imidazolium,pyridinium,pyrrolidinium,alkylammonium,alkylsulfonium,morpholinium and piperidinium cations and various anions.The data collected cover the temperature ranges of 278.15-343.15 K and static dielectric constant ranges of 9.4-85.6.The results of the method show a satisfactory agreement with the literature data with an average absolute relative deviation of 7.41%,which is generally of the same order of the experimental data accuracy.The method proposed in this paper provides a simple but reliable approach for the prediction of static dielectric constant of ionic liquids at different temperatures. 展开更多
关键词 ionic liquid static dielectric constant group contribution method
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Modeling p VT Properties and Vapor-Liquid Equilibrium of Ionic Liquids Using Cubic-plus-association Equation of State
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作者 马俊 李进龙 +3 位作者 范冬福 彭昌军 刘洪来 胡英 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第6期1009-1016,共8页
Combining Peng-Robinson (PR) equation of state (EoS) with an association model derived from shield-sticky method (SSM) by Liu et al., a new cubic-plus-association (CPA) EoS is proposed to describe the ther-mod... Combining Peng-Robinson (PR) equation of state (EoS) with an association model derived from shield-sticky method (SSM) by Liu et al., a new cubic-plus-association (CPA) EoS is proposed to describe the ther-modynamic properties of pure ionic liquids (ILs) and their mixtures. The new molecular parameters for 25 ILs are obtained by fitting the experimental density data over a wide temperature and pressure range, and the overall aver-age deviation is 0.22%. The model parameter b for homologous ILs shows a good linear relationship with their mo-lecular mass, so the number of model parameters is reduced effectively. Using one temperature-independent binary adjustable parameter kij, satisfactory correlations of vapor-liquid equilibria (VLE) for binary mixtures of ILs + non-associating solvents and + associating solvents are obtained with the overall average deviation of vapor pressure 2.91% and 7.01%, respectively. In addition, VLE results for ILs + non-associating mixtures from CPA, lattice-fluid (LF) and square-well chain fluids with variable range (SWCF-VR) EoSs are compared. 展开更多
关键词 cubic-plus-association equation of state ionic liquids vapor-liquid equilibrium
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Speed of Sound in Asymmetric Quark Matter
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作者 XIE Chonglong HE Weibo +1 位作者 LI Zhipeng SHAO Guoyun 《原子核物理评论》 CAS CSCD 北大核心 2024年第1期587-593,共7页
The speed of sound in quark matter is an important physical quantity for studying the properties and the spacetime evolution of quark-gluon plasma(QGP).The behavior of the speed of sound with respect to temperature an... The speed of sound in quark matter is an important physical quantity for studying the properties and the spacetime evolution of quark-gluon plasma(QGP).The behavior of the speed of sound with respect to temperature and density can reveal to some extent the equation of state and the phase structure of QGP.Building upon the previous studies on the speed of sound in symmetric quark matter,the formulae for calculating the speed of sound in asymmetric quark matter in the temperature-density space are further derived.The PNJL model is then used to calculate the dependence of the speed of sound on isospin asymmetry.Furthermore,the relationship between the magnitude of the speed of sound and the QCD phase structure is discussed,and the regions where the acoustic equation fails are indicated under different physical conditions.It is found that the boundary of vanishing sound speed in asymmetric quark matter is smaller than that in symmetric quark matter,meaning that the range where the acoustic wave equation fails in asymmetric quark matter is smaller than that in symmetric quark matter.The results also indicate that in most of the stable phase,the speed of sound in asymmetric quark matter is slightly larger than that in symmetric quark matter. 展开更多
关键词 quark-gluon plasma equation of state speed of sound
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Numerical modeling and analysis of plasmonic flying head for rotary near-field lithography technology 被引量:2
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作者 Yueqiang HU Yonggang MENG 《Friction》 SCIE CSCD 2018年第4期443-456,共14页
Rotary near-field lithography(RNFL) technology provides a route to overcome the diffraction limit with a high throughput and low cost for nanomanufacturing. Utilizing the advantage of the passive flying of a plasmonic... Rotary near-field lithography(RNFL) technology provides a route to overcome the diffraction limit with a high throughput and low cost for nanomanufacturing. Utilizing the advantage of the passive flying of a plasmonic head, RNFL can achieve a 10 m/s processing speed with a perfect near-field condition at dozens of nanometers. The flying performance of the plasmonic flying head(PFH) is the pivotal issue in the system. The linewidth has a strong correlation with the near-field gap, and the manufacturing uniformity is directly influenced by the dynamic performance. A more serious issue is that the unexpected contact between the PFH and substrate will result in system failure. Therefore, it is important to model and analyze the flying process of the PFH at the system level. In this study, a novel full-coupled suspension-PFH-air-substrate(SPAS) model that integrates a six-degree of freedom suspension-PFH dynamics, PFH-air-substrate air bearing lubrication, and substrate vibration, is established. The pressure distribution of the air bearing is governed by the molecular gas lubrication equation that is solved by the finite element method(FEM) with a local pressure gradient based adaptive mesh refinement algorithm using the COMSOL Multiphysics software. Based on this model, three designs of the air bearing surface are chosen to study the static, dynamic, and load/unload performance to verify whether it satisfies the design requirements of RNFL. Finally, a PFH analysis solver SKLY.app is developed based on the proposed model. 展开更多
关键词 rotary near-field lithography (RNFL) coupled analysis air bearing finite element method
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