检索结果-南通市图书馆

Ionization of two-electron atom(xenon)studied by Bohmian mechanics theory

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第11期29卷 297-302页

作者： Yang Song Shu Han Yu-Jun Yang fu-ming Guo Su-Yu Li College of Science Northeast Electric Power UniversityJilin 132012China Archives Northeast Electric Power UniversityJilin 132012China Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China

The ionization dynamics of two-electron atom in an intense laser field is studied by the Bohmian mechanics(BM)theory, and the xenon atomic potential function is used as a model. The single ionization process and double ionization process are calculated by the BM theory and their results are in good agreement with those calculated by numerically solving the time-dependent Schrodinger equation. The analyses of the types, trajectories, and forces of Bohmian particles(BPs)undergoing the single and double ionizations indicate that the re-collision process accounts for a considerable proportion in the singly ionized cases. furthermore, the analysis of the work done by the external force acting on the BPs shows that the quantum force plays an important role in the re-collision process. This work is helpful in understanding the ionization of two-electron atom in an intense laser field.

关键词： Bohmian mechanics quantum force atomic ionization re-collision process

Resonance-enhanced two-photon ionization of hydrogen atom in intense laser field investigated by Bohmian-mechanics

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第9期29卷 288-294页

Resonance enhanced two-photon ionization process of hydrogen atom via the resonant laser pulse is studied by Bohmian mechanics (BM) method. By analyzing the trajectories and energies of Bohmian particles (BPs), we find that under the action of high frequency and low intensity multi-circle resonant laser pulses, the ionized BPs first absorb one photon completing the excitation, and then absorb another photon, completing the ionization after staying in the first excited state for a period of time. The analysis of work done by the forces shows that the electric field force and quantum force play a major role in the whole ionization process. At the excitation moment and in the excitation-ionization process, the effect of the quantum force is greater than that of the electric field force. Finally, we discuss the principle of work and energy for BPs, and find that the electric field force and quantum force are non-conservative forces whose work is equal to the increment of mechanical energy of the system. In addition, it is proved that the quantum potential energy actually comes from the kinetic energy of the system and the increment of kinetic energy is equal to that of the kinetic energy of the system.

关键词： Bohmian mechanics quantum force resonance-enhanced two-photon ionization

Improved preparation of(1S,3',4'S,5'S,6'R)-5-chloro-6-[(4-ethylphenyl)methyl]-3',4',5',6'-tetrahydro-6'-(hydroxymethyl)-spiro[isobenzofuran-l(3H),2'-[2H]pyran]-3',4',5'-triol

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2013年第2期24卷 131-133页

作者： Yong-Hai Liu Ting-ming fu Chun-Yan Ou Wen-Ling Fan Guo-Ping Peng School of Pharmacy Nanjing University of Chinese Medicine

Received 9 November 2012 Received in revised form 23 November 2012 Accepted 3 December 2012 Available online 29 January 2013

关键词： Type 2 diabetesSodiurn glucose co-transporter 2InhibitorPreparation

Study on Inclusions in Large Sapphire Optical Crystal Grown by SAPMAC Method

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2006年第B12期19卷 31-35页

作者： WANG Gui-gen ZHANG ming-fu ZUO Hong-bo HE Xiao-dong HAN Jie-cai Center for Composite Structure Harbin Instime of Technology Harbin 150080 China

The sapphire （Al2O3） single crystal is a kind of excellent infrared transmission window materials. A large-sized sapphire （Ф225 mm×205 mm, 27.5 kg） was grown by SAPMAC method （sapphire growth technique with micro-pulling and shoulder-expanding at cooled center）. Several kinds of inclusion in the large sapphire crystal were investigated by means of an optical microscopy （OM）, scanning electron microscopy （SEM） and electron probe microanalysis （EPMA）. The experimental results show that most inclusions are consisted of solid metallic and non-metallic particles as well as gas pores caused by the impurity of alumina as the raw material, the thermal dissociation of aluminum oxide melt and the reaction of the melt to the crucible material （Mo） at high temperatures. It is also found that in different crystal regions the inclusions are of varied sizes, morphology and chemical compositions. Finally, the measures to reduce and eliminate the inclusions are proposed to improve the crystal quality.

关键词： sapphire single crystal inclusions bubbles SAPMAC method

Interaction of Aromatic Hydrocarbons with Sulfuric Acid,Bisulfate and Sulfate Anions

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2010年第7期29卷 1091-1097页

作者： ZHAO Ya-Ying ZENG Eddy Y ZHANG Xi-Hui MA Lin TAO fu-ming Research Center of Environmental Engineering and Management Graduate School at Shenzhen. Tsinghua University. Shenzhen 518055 China State Key Laboratory of Organic Geochemistr). Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Department of Chemistry and Biochemistry California State University Fullerton CA 92834 USA

Intermolecular geometries and energies of the dimers formed between simple aromatic hydrocarbons （benzene, toluene and naphthalene） and sulfate species （sulfuric acid, bisulfate and sulfate） were studied by density functional theory. The AH：H2SO4 complexes were determined by the OH-π H-bond, with H2SO4 acting as the H-bond donor and AHs as the aeeeptor. However, the AHs：HSO4- and AHs：SO4^2- complexes were established by the H-bond, with AHs serving as acid and HSO4 or SO4^2- as alkali. The atmospheric implications of those complexes were strongly supported by their considerable binding energies.

关键词： PAHs sulfate species interaction density functional theory

Inhalation of shin-I essential oil enhances lactate clearance in treadmill exercise

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2014年第2期4卷 158-163页

作者： Hsuan-Ying Chen ming-fu Wang Jun-Ying Lin Ying-Chich Tsai fu-Chou Cheng Stem Cell Center.Department of Medical Research Taichung Veterans General Hospital1650.Sect.4.Taiwan BoulevardTaichung40705Taiwan Department of Food and Nutrition Providence University200.Sec.7Taiwan Boulevard.Shalu Dist.Taichung43301Taiwan Yangsen Bioteclnology Co. Ltd.3F5.Sec.1Bei-tou.Rd.Bei-tonTaipei11245Taiwan Institute of Biochemistry and Molecular Biology National Yang-Ming University155Sec.2Li-mong Street.Taipei11221Taiwan

Objective:To evaluate the effect of Shin-I essential oil inhalation on blood lactate changes in rats subjected to treadmill ***:Adult male Sprague Dawley rats(n=12) were randomly divided into the control or the Shin—1 *** were subjected to a treadmill exercise program(15 m/min for 30 *** exercise,rats were exposed to 200 *** water or Shin—I essential ***|*** a nebulizer for 180 min during the recovery *** samples were collected every 15 *** glucose and lactate concentrations were determined in a CMA 600 ***:The basal glucose and lactate levels wen? no significantly different between two *** exercise,glucose levels were slightly increased to about 110%-120%of the basal level in both *** levels of both groups reached to 110%-140%of basal levels during *** the recovery period,lactate levels further increased to 180%of the basal level and were maintained at a plateau in the control ***,lactate levels gradually decreased to 609—657 of the basal level in the Shin-I *** clearance was significantly enhanceil after Shin-I essential oil ***:Our results provide evidence that Shin-I essential oil inhalation may accelerate recovery after exercise in rats.

关键词： Blood Lactate Shin-I essential oil Treadmill exercise

Deconsolidation and combustion performance of thermally consolidated propellants deterred by multi-layers coating

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

Defence Technology（防务技术） 2014年第2期10卷 101-105页

作者： Zheng-gang XIAO San-jiu YING fu-ming XU School of Chemical Engineering Nanjing University of Science and Technology

Both heating and solvent-spray methods are used to consolidate the standard grains of double-base oblate sphere propellants plasticized with triethyleneglycol dinitrate(TEGDN)(TEGDN propellants) to high density *** obtained consolidated propellants are deterred and coated with the slow burning multi-layer *** maximum compaction density of deterred and coated consolidated propellants can reach up to 1.39 g/*** mechanic,deconsolidation and combustion performances are tested by the materials test machine,interrupted burning set-up and closed vessel,*** static compression strength of consolidated propellants deterred by multi-layer coating increases significantly to 18 MPa,indicating that they can be applied in most circumstances of charge *** the samples are easy to deconsolidate in the interrupted burning ***,the closed bomb burning curves of the samples indicate a two-stage combustion phenomenon under the condition of certain thickness of coated *** the outer deterred multi-layer coating of consolidated samples is finished burning,the inner consolidated propellants continue to bum and breakup into aggregates and *** high burning progressivity can be carefully obtained by the smart control of deconsolidation process and duration of consolidated *** preliminary results of consolidated propellants show that a rapid deconsolidation process at higher deconsolidation pressure is presented in the dynamic vivacity curves of closed bomb *** density and higher macro progressivity of consolidated propellants can be obtained by the techniques in this paper.

关键词：燃烧性能推进剂多层涂布拆分材料试验机热固多层涂层乙二醇酯

Effects of proteinase A on cultivation and viability characteristics of industrial Saccharomyces cerevisiae WZ65

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第10期10卷 769-776页

作者： Hong-bo ZHANG Hai-feng ZHANG Qi-he CHEN Hui RUAN ming-liang fu Guo-qing HE Department of Food Science and Nutrition Zhejiang University Hangzhou 310029 China

Proteinase A （PrA）, encoded by PEP4 gene, is a key enzyme in the vacuoles of Saccharomyces cerevisiae. We characterized the effects of PrA on cell growth and glucose metabolism in the industrial S. cerevisiae WZ65. It was observed that the lag phase of cell growth of partial PEP4 gene deletion mutant （36 h） and PrA-negative mutant （48 h） was significantly extended, compared with the wild type strain （24 h）（P〈0.05）, but PrA had no effect on glucose metabolism either under shaking or steady state cultivations. The logistic model was chosen to evaluate the effect of PrA on S. cerevisiae cell growth, and PrA was found to promote cell growth against insufficient oxygen condition in steady state cultivation, but had no effect in shaking cultivation. The effects of glucose starvation on cell growth of partial PEP4 gene deletion strain and PrA-negative mutant were also evaluated. The results show that PrA partial deficiency increased the adaption ofS. cerevisiae to unfavorable nutrient environment, but had no effect on glucose metabolism under the stress of low glucose. During heat shock test, at 60 ℃ the reduced cell viability rate （RCVR） was 10% for the wild type S. cerevisiae and 90% for both mutant strains （P〈0.01）, suggesting that PrA was a negative factor for S. cerevisiae cells to survive under heat shock. As temperatures rose from 60 ℃ to 70℃, the wild type S. cerevisiae had significantly lower relative glucose consumption rate （RGCR）（61.0% and 80.0%） than the partial mutant （78.0% and 98.5%） and the complete mutant （80.0% and 98.0%）（P〈0.05）, suggesting that, in coping with heat shock, cells of the PrA mutants increased their glucose consumption to survive. The present study may provide meaningful information for brewing industry; however, the role of PrA in industrial S. cerevisiae physiology is complex and needs to be further investigated.

关键词： Proteinase A (PrA) PEP4 gene Saccharomyces cerevisiae WZ65 Cell metabolism Viability

A Remark on Adaptive Decomposition for Nonlinear Time-frequency Analysis

在线全文

学校读者我要写书评

暂无评论

Communications in Mathematical Research 2016年第4期32卷 319-324页

作者： LIU XU WANG HAI-NA Ma fu-ming School of Applied Mathematics Jilin University of Finance and EconomicsChangchun130117 不详

In recent study the bank of real square integrable functions that have nonlinear phases and admit a well-behaved Hilbert transform has been constructed for adaptive representation of nonlinear signals. We first show in this paper that the available basic functions are adequate for establishing an ideal adaptive decomposition algorithm. However, we also point out that the best approximation algorithm, which is a common strategy in decomposing a function into a sum of functions in a prescribed class of basis functions, should not be considered as a candidate for the ideal algorithm.

关键词： Hilbert transform empirical mode decomposition adaptive decompo-sition algorithm best approximation

维普期刊数据库博看期刊