检索结果-南通市图书馆

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

激光诱导放电等离子体极紫外辐射的模拟

物理学报 2024年第1期73卷 258-265页

作者：王均武玄洪文俞航航王新兵 vassily S.zakharov 广东大湾区空天信息研究院广州510700 华中科技大学武汉国家光电研究中心武汉430074 凯尔迪什应用数学研究所莫斯科125047 中国科学院大学北京100049

极紫外光刻是目前新一代超高集成度半导体芯片制造流程中重要的一环,激光诱导放电等离子体是极紫外光源产生的重要技术手段之一.本文基于全局状态方程、原子结构计算程序、碰撞辐射模型建立了一个辐射磁流体力学模型,对激光诱导放电等... 详细信息

极紫外光刻是目前新一代超高集成度半导体芯片制造流程中重要的一环,激光诱导放电等离子体是极紫外光源产生的重要技术手段之一.本文基于全局状态方程、原子结构计算程序、碰撞辐射模型建立了一个辐射磁流体力学模型,对激光诱导放电等离子体的动力学特性及极紫外的辐射特性进行模拟,模拟复现了放电过程中的箍缩现象,得到的极紫外光的转化效率与实验符合.研究发现放电电流的上升速率对极紫外光的产生有极大的影响,该结果对后续极紫外光输出功率、转化效率以及光谱纯度的提升有重要的指导意义.

关键词：辐射磁流体力学激光诱导放电等离子体碰撞辐射模型极紫外光

维普期刊数据库博看期刊

Laser-induced liquid tin discharge plasma and its EUV spectra

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2020年第5期18卷 40-43页

作者：王均武王新兵左都罗 vassily zakharov Wuhan National Research Center for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Keldysh Institute of Applied Mathematics Russian Academy of SciencesMoscow 125047Russia

Laser-induced discharge plasmas(LDPs) have the potential to be inspection and metrology sources in extreme ultraviolet(EUV) lithography. An LDP EUV source was developed to avoid tin electrode erosion in which a tin pool was used as a cathode. A CO2 pulse laser was focused on the liquid tin target surface, and then a breakdown occurred in a very short time. The voltage-current characteristics of the discharge oscillated, lasting for several microseconds, and an RLC fitting model was used to obtain the inductance and resistance. An intensified chargecoupled device(ICCD) camera was used to investigate the dynamics of LDP, which can explain the formation of a discharge channel. The EUV spectra of laser-induced liquid tin discharge plasma were detected by a grazing incident ultraviolet spectrometer, compared with a laser-produced tin droplet plasma EUV spectrum. To explain the EUV spectrum difference of laser-induced liquid tin discharge plasma and laser-produced tin droplet plasma,the collision radiation(CR) model combined with COWAN code was used to fit the experimental EUV spectrum, which can estimate the electron temperature and density of the plasma.

关键词： laser induced discharge plasma voltage-current characteristics liquid tin plasma plume extreme ultraviolet spectra

Micro-pinch formation and extreme ultraviolet emission of laser-induced discharge plasma

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第9期30卷 355-363页

作者：王均武王新兵左都罗 vassily S.zakharov Wuhan National Research Center for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Keldysh Institute of Applied Mathematics Russian Academy of SciencesMoscowRussia

Extreme ultraviolet(EUV)source produced by laser-induced discharge plasma(LDP)is a potential technical means in inspection and metrology.A pulsed Nd:YAG laser is focused on a tin plate to produce an initial plasma thereby triggering a discharge between high-voltage electrodes in a vacuum *** process of micro-pinch formation during the current rising is recorded by a time-resolved intensified charge couple device *** evolution of electron temperature and density of LDP are obtained by optical emission *** extreme ultraviolet spectrometer is built up to investigate the EUV spectrum of Sn LDP at 13.5 *** laser and discharge parameters such as laser energy,voltage,gap distance,and anode shape can influence the EUV emission.

关键词： laser-induced discharge plasma micro-pinch electron temperature and density extreme ultraviolet spectra

Low-frequency laboratory measurements of the elastic properties of solids using a distributed acoustic sensing system

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2023年第9期15卷 2330-2338页

作者： vassily Mikhaltsevitch Maxim Lebedev Roman Pevzner Alexey Yurikov Konstantin Tertyshnikov Curtin University GPO Box U1987PerthWA 6845Australia Centre for Sustainable Energy and Resources Edith Cowan University270 Joondalup DrJoondalupWA 6027Australia

In recent decades,low-frequency(LF)experiments based on the forced-oscillation(FO)method have become common practice in many rock physics laboratories for measuring the elastic and anelastic properties of ***,the use of the electronic displacement sensors in traditional acquisition systems of FO devices such as conventional capacitive transducers or strain gauges seriously limits both the efficiency and productivity of LF measurements,and,due to the limited contact area of the displacement sensors with a sample under test,increases the requirements for sample *** this paper,we present the first results obtained in the development of a new laboratory method elaborated to measure the elastic properties of *** method is a further development of the FO method where traditional data acquisition is replaced by acquisition based on fiber-optic distributed acoustic sensing(DAS)*** new method was tested in a laboratory study using two FO setups designed for measurements under uniaxial and confining *** study was carried out on a sample made from polymethyl methacrylate(PMMA)and an aluminium standard,first under uniaxial pressure at FO frequencies of 1,10,30,60 and 100 Hz,and then under confining pressure at an FO frequency of 1 *** uniaxial and confining pressures were equal to 10 MPa,and the strain in the PMMA sample in all measurements did not exceed 4×10^(-8).The performance of DAS acquisition was compared with the measurements conducted at a strain of 1×10^(-6) using the traditional FO method based on the use of semiconductor strain gauges and the ultrasonic *** results of the DAS measurements are in good agreement with the FO measurements carried out using semiconductor strain gauges and with the literature data.

关键词： Elasticity and anelasticity Acoustic properties Fourier analysis Wave propagation

Simultaneous multiple time scale imaging for kHz-MHz high-speed accelerometry

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2022年第7期10卷 1712-1722页

作者： vassily KORNIENKO DAVID ANDERSSON MEHDI STITI JONAS RAVELID SIMON EK ANDREAS EHN EDOUARD BERROCAL ELIAS KRISTENSSON Division of Combustion Physics Department of PhysicsLund UniversityLundSweden

Fast transient events,such as the disintegration of liquid bodies or chemical reactions between radical species,involve various processes that may occur at different time ***,there are two alternatives for monitoring such events:burst-or high-speed *** imaging at ultrahigh speeds(~100 MHz to THz)allows for the capture of nature's fastest processes but only for a narrowly confined period of time and at a repetition rate of~10 *** long lasting,rapidly evolving transient events requires a significantly higher repetition rate,which is met by existing~kHz to 1 MHz high-speed imaging ***,the use of such systems eliminates the possibility to observe dynamics occurring on the sub-microsecond time *** this paper,we present a solution to this technological gap by combining multiplexed imaging with high-speed sensor technology,resulting in temporally resolved,high-spatial-resolution image series at two simultaneous time *** further demonstrate how the collection of such data opens up the tracking of rapidly evolving structures up to MHz burst rates over long durations,allowing,for the first time,to our knowledge,the extraction of acceleration fields acting upon the liquid bodies of an atomizing spray in two dimensions at k Hz frame rates.

关键词： repetition high transient

Lack of evolutionary convergence in multiple primary lung cancer suggests insufficient specificity of personalized therapy

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2023年第5期50卷 330-340页

作者： Hua Cheng Ziyan Guo Xiaoyu Zhang Xiao-Jin Wang Zizhang Li Wen-Wen Huo Hong-Cheng Zhong Xiao-Jian Li Xiang-Wen Wu Wen-Hao Li Zhuo-Wen Chen Tian-Chi Wu Xiang-Feng Gan Bei-Long Zhong vassily ALyubetsky Leonid Yu Rusin Junnan Yang Qiyi Zhao Qing-Dong Cao Jian-Rong Yang Department of Thoracic Surgery The Fifth Affiliated HospitalSun Yat-Sen UniversityZhuhaiGuangdong 519000China Department of Genetics and Biomedical Informatics Zhongshan School of MedicineSun Yat-sen UniversityGuangzhouGuangdong 510080China Program in Cancer Research Zhongshan School of MedicineThe Fifth Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdong 510080China Kharkevich Institute for Information Transmission Problems Russian Academy Sciences Moscow 127051Russia Department of Mathematical Logic and Theory of Algorithms Faculty of Mechanics and MathematicsLomonosov Moscow State UniversityMoscow 119991Russia Department of Infectious Diseases Third Affiliated HospitalSun Yat-Sen UniversityGuangzhouGuangdong 510630China Guangdong Provincial Key Laboratory of Liver Disease Research the Third Affiliated Hospital Sun Yat-sen UniversityGuangzhouGuangdong 510630China Key Laboratory of Tropical Disease Control Ministry of EducationSun Yat-sen UniversityGuangzhouGuangdong 510080China

Multiple primary lung cancer(MPLC)is an increasingly prevalent subtype of lung *** to recent genomic studies,the different lesions of a single MPLC patient exhibit functional similarities that may reflect evolutionary *** perform whole-exome sequencing for a unique cohort of MPLC patients with multiple samples from each lesion *** our own and other relevant public data,evolutionary tree reconstruction reveals that cancer driver gene mutations occurred at the early trunk,indicating evolutionary contingency rather than adaptive ***,tumors from the same MPLC patient are as genetically diverse as those from different patients,while within-tumor genetic heterogeneity is significantly ***,the aberrant molecular functions enriched in mutated genes for a sample show a strong overlap with other samples from the same tumor,but not with samples from other tumors or other ***,there is no evidence of adaptive convergence during the evolution of *** importantly,the similar between-tumor diversity and between-patient diversity suggest that personalized therapies may not adequately account for the genetic diversity among different tumors in an MPLC *** fully exploit the strategic value of precision medicine,targeted therapies should be designed and delivered on a per-lesion basis.

关键词： Multiple primary lung cancer Cancer evolution Convergent evolution

Spin nature of genetic code

在线全文

学校读者我要写书评

暂无评论

Journal of Biophysical Chemistry 2013年第2期4卷 52-57页

作者： Alexander A. Tulub vassily E. Stefanov Faculty of Biology and Soil Saint-Petersburg State University Saint Petersburg Russia School of Physics and Astronomy University of Manchester Manchester UK

Nature has developed codon as a tool to manipulate a two-electron spin symmetry (short-living electrons, forming a radical pair, arise from the Mg-bound nucleosidetriphosphate cleavage at the triplet/singlet (T/S) crossing), which permits or forbids further nucleotide synthesis (DNA/RNA) and the synthesis of proteins. The thesis is confirmed by conducting DFT:B3LYP (6-311G** basis set) computations (T/S potential energy surfaces) with the model system composed of the template (C-G-C-G-A nucleotide sequence) and the growing chain (G-C-G nucleotide sequence, DNA or RNA). The origin of codon is in hyperfine interaction between a single electron, transferred onto the template, and three 31P nuclei built into the phosphorus fragments of nucleotides. The nuclei, together with the polynucleotide structure, form a spiral twist that is homeomorphic to a triangle patch on the Poincare sphere. Each triangle has unique angle values depending on the nucleotide nature and their position in the codon. The patch tracing produces the Berry phase changing the electron spin orientation from “up” to “down”. The Berry phase accumulation proceeds around the (T/S) conical intersections (CIs). The CIs are a result of complementary recognition between nucleotide bases at distances exceeding the commonly accepted Watson-Crick pairing by 0.17 A. Upon changing spin symmetry, the DNA or RNA chain is allowed to elongate by attaching a newly coming nucleotide. Without complementary recognition between the bases, the chain stops its elongation. The Berry phase accumulation along the patch tracing explains the effect of Crick’s wobbling when the second nucleotide plays a primary role in recognition. The data is directly linked to creation of a quantum computing device.

关键词： Spintronics Nucleotides Genetic Code Quantum Computations Berry’s Phase Hyperfine Coupling

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

康定斯基论艺

康定斯基论艺