检索结果-南通市图书馆

Theoretical Study on Drift of Ca^(2+)Spiral Waves Controlled by Electric Field

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

Communications in Theoretical Physics 2009年第5期51卷 941-946页

作者： TANG jun JIA ya.ma.jun YI Ming Department of Physics and Institute of Biophysics Huazhong Normal University Wuhan 430079 China College of Science China University of Mining and Technology Xuzhou 221008 China Department of Physics Lanzhou University of Technology Lanzhou 730050 China

Based on the Tang-Othmer Ca^2＋ model, the drift behavior of intracellular Ca^2＋ spiral waves under the influence of weak electric field is investigated. Numerical results show that the dependence of drift velocity of the spiral tip on dc electric field is similar to experimental observations in BZ system. When an ac electric field is applied, interesting resonant-drift phenomenon is observed with ω=2ω0. All results can be explained analytically using a proximate method.

关键词： Ca^2+ spiral wave tip drift electric field

Lattice Boltzmann method for simulation of time-dependent neutral particle transport

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2017年第3期28卷 74-84页

作者： ya.Hui Wang Li-Ming ya. Bang-ya.g xia Yu ma School of Energy Science and Engineering Harbin Institute of Technology Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China

In this paper, a novel model is proposed to investigate the neutron transport in scattering and absorbing medium. This solution to the linear Boltzmann equation is expanded from the idea of lattice Boltzmann method(LBM) with the collision and streaming process. The theoretical derivation of lattice Boltzmann model for transient neutron transport problem is proposed for the first *** fully implicit backward difference scheme is used to ensure the numerical stability, and relaxation time and equilibrium particle distribution function are obtained. To validate the new lattice Boltzmann model, the LBM formulation is tested for a homogenous media with different sources, and both transient and steady-state LBM results get a good agreement with the benchmark solutions.

关键词： Transient neutron transport Lattice Boltzmann method Linear Boltzmann equation

在线全文

学校读者我要写书评

暂无评论

供应链韧性研究进展及其测度方法研究

南宁师范大学学报(自然科学版) 2025年第1期42卷 48-58页

作者：马小雅徐浩彭俊豪南宁师范大学物流管理与工程学院

通过文献计量和知识图谱方法，以“供应链韧性”为主题，分别从Web of Science和CNKI数据库中筛选出相关度较高的期刊文献，以“供应链韧性”测度为主题，从Web of Science数据库中筛选相关度较高的期刊文献。通过分析2010年以来国内外... 详细信息

通过文献计量和知识图谱方法，以“供应链韧性”为主题，分别从Web of Science和CNKI数据库中筛选出相关度较高的期刊文献，以“供应链韧性”测度为主题，从Web of Science数据库中筛选相关度较高的期刊文献。通过分析2010年以来国内外相关研究，探讨供应链韧性的热点问题、核心领域以及测度方法。研究发现：供应链韧性的热点问题主要聚焦供应链韧性的特性、测度方法、评价指标和影响因素，供应链韧性研究的核心领域则在供应链韧性特性研究、供应链韧性的优化设计以及供应链风险管理；供应链韧性测度的研究热点聚焦供应链韧性测度方法、指标体系、影响因素和供应链特性方面；供应链韧性及其测度的研究均呈现明显的时期特征。通过对测度方法的深入研究分析发现：供应链韧性测度方法包括定性分析、定量分析和综合评价分析，常用的综合评价法涵盖主观和客观权重法，旨在全面评估供应链的抵抗、恢复和适应能力。最后从供应链韧性理论深化和整合方向、供应链韧性测度指标体系构建和方法创新等方面对未来的研究方向进行探讨，以期对后续研究提供一定的指导。

关键词：供应链韧性测度方法评价指标影响因素文献计量知识图谱

维普期刊数据库博看期刊

Effects of Atomic Coherence and Injected Classical Field on Chaotic Dynamics of Non-degenerate Cascade Two-Photon Lasers

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第2X期48卷 288-294页

作者： ZHANG ya.jun HUANG Hong-Bin ya.G Peng XIE xia Department of Physics Southeast University Nanjing 210096 China Nanjing Institute of Astronomical Optics and Technology Nanjing 210042 China

Based on the cascade two-photon laser dynamic equation derived with the technique of quantum Langevin operators with the considerations of coherently prepared three-level atoms and the classical field injected into the cavity, we numerically study the effects of atomic coherence and classical field on the chaotic dynamics of a two-photon laser. Lya.unov exponent and bifurcation diagram calculations show that the Lorenz chaos and hyperchaos can be induced or inhibited by the atomic coherence and the classical field via crisis or Hopf bifurcations.

关键词： nondegenerate cascade two-photon laser chaos bifurcation injected classical field atomic coherence

Properties of phosphate glass waste forms containing fluorides from a molten salt reactor

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2016年第3期27卷 96-102页

作者： ya.Ping Sun xiao-Bin xia ya.-Bo Qiao Zhong-Qi Zhao Hong-jun ma Xue-ya.g Liu Zheng-Hua Qian Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

Radioactive fluoride wastes are generated during the operation of molten salt reactors(MSRs) and reprocessing of their spent *** of these wastes in borosilicate glass is not feasible because of the very low solubility of fluorides in this *** candidates are thus an active topic of research including phosphatebased glasses,crystalline ceramics,and hybrid glass-ceramic *** this study,mixed fluorides were employed as simulated MSRs waste and incorporated into sodium aluminophosphate glass to obtain phosphate-based waste *** waste forms were characterized by X-ray diffraction,Raman spectroscopy,and scanning electron *** tests were performed in deionized water using the product consistency test A *** study demonstrates that up to 20 mol%of simulated radioactive waste can be introduced into the NaA1 P glass matrix,and the chemical durability is much better than that of *** addition of Fe_2O_3 in the NaAlP glass matrix results in increases of the chemical durability at the expense of fluoride loading(to 6.4 mol%).Phosphate glass vitrification of radioactive waste containing fluorides is a potential method to treat and dispose of MSR wastes.

关键词：磷酸盐玻璃玻璃废物含氟化物放射性废物处理扫描电子显微镜熔盐堆硼硅酸盐玻璃化学耐久性

Fabrication of hollow porous PLGA microspheres for controlled protein release and promotion of cell compatibility

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2013年第8期24卷 710-714页

作者： Guo-Hua Zhang Rui-xia Hou Dan-xia Zhan ya.g Cong ya.jun Cheng jun Fu Polymers and Composites Division Ningbo Institute of Materials Technology and EngineeringChinese Academy of Sciences School of Chemical Engineering Ningbo University of Technology

This letter reports on the fabrication of hollow,porous and non-porous poly（D,L-lactide-co-glycolide）（PLGA） microspheres（MSs） for the controlled release of protein and promotion of cell compatibility of tough *** MSs with different structures were prepared with modified double emulsion methods,using bovine serum albumin（BSA） as a porogen during *** release of the residual BSA from PLGA MSs was investigated as a function of the MS *** hollow PLGA MSs show a faster protein release than the porous MSs,while the non-porous MSs have the slowest protein *** the PLGA MSs with poly（vinyl alcohol）（PVA） hydrogels promoted chondrocyte adhesion and proliferation on the hydrogels.

关键词： PLGA microspheres Controlled release Hydrogel Cell compatibility

Synergy of porous structure and cation doping in Ta3N5 photoanode towards improved photoelectrochemical water oxidation

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第1期30卷 343-350,I0011页

作者： Yubin Chen Hongyu xia xiaoya.g Feng ya.Liu Wenyu Zheng Lijing ma Rui Li International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049ShaanxiChina

Herein,a cross-linked porous Ta3N5 film was prepared via a simple solution combustion route followed by a high-temperature nitridation process for photoelectrochemical(PEC) water ***,the metal cations(Mg2+ and Zr4+) were incorporated into the porous Ta3N5 to enhance the PEC *** porous Mg/Zr co-doped Ta3N5 photoanode yielded a photocurrent density of 1.40 ma cm^(-2) at 1.23 V vs RHE,which is 5.6 times higher than that of the dense Ta3N5 *** enhanced performance should be ascribed to the synergistic effect of porous structure and cation doping,which can enlarge the electrochemical active surface area and accelerate the charge transfer by introducing ON substitution ***,Co(OH)2 cocatalyst was loaded on the Mg/Zr-Ta3N5 photoanode to negatively shift the onset potential to 0.45 V vs RHE and further improve the photocurrent density to 3.5 ma cm^(-2)at 1.23 V ***,with a maximum half-cell solar to hydrogen efficiency of 0.45%.The present study provides a new strategy to design efficient Ta3N5 photoelectrodes via the simultaneous control of the morphology and composition.

关键词： Photoelectrochemical water oxidation Ta3N5 Porous structure Doping Solution combustion

基于三矩形谐振腔非通MIM波导的四重法诺传感

在线全文

学校读者我要写书评

暂无评论

原子与分子物理学报 2025年第3期42卷 116-123页

作者：王叶壮沈宏君陈俊坤王雅雯宁夏大学物理学院银川750000

为了得到高灵敏度的生物传感器,设计了一种可以激发出四重法诺共振的非通金属-绝缘体-金属(Metal-Insulator-Metal,MIM)波导传感器.采用了上下对称结构,由一个竖放矩形谐振腔和两个横放矩形谐振腔与总线波导共同作用而得到了四重法诺共... 详细信息

为了得到高灵敏度的生物传感器,设计了一种可以激发出四重法诺共振的非通金属-绝缘体-金属(Metal-Insulator-Metal,MIM)波导传感器.采用了上下对称结构,由一个竖放矩形谐振腔和两个横放矩形谐振腔与总线波导共同作用而得到了四重法诺共振.采用了有限时域差分方法计算了此结构的传输特性与Z方向的归一化磁场,并详细分析了其法诺共振的产生机理.通过计算结构几何参数调节后的透射光谱,从而得出了四处法诺共振峰透射率和共振位置可以通过改变结构几何参数而获得独立调节.此外还发现在结构中添加不同浓度的葡萄糖溶液可以实现高折射率传感灵敏度(S),获得最高灵敏度2736.98nm/RIU,可以看出此结构对于折射率变化有很高的灵敏度,这为设计和优化纳米级别的折射率传感器提供了新的思路,还可以应用于电路构建前进行性能测试.

关键词：金属-绝缘体-金属传感器谐振腔法诺共振灵敏度

维普期刊数据库博看期刊

同方期刊数据库

Channel noise-induced phase transition of spiral wave in networks of Hodgkin-Huxley neurons

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2011年第2期56卷 151-157页

作者： ma.jun WU Ying YING HePing JIA ya Department of Physics Lanzhou University of Technology Lanzhou 730050 China Department of Physics Huazhong Normal University Wuhan 430079 China School of Science Xi'an University of Technology Xi'an 710048 China Zhejiang Institute of Modern Physics Zhejiang University Hangzhou 310027 China

The phase transition of spiral waves in networks of Hodgkin-Huxley neurons induced by channel noise is investigated in *** neurons in the networks are coupled with small-world connections,and the results are compared with the case for regular networks,in which all neurons are completely coupled with nearest-neighbor connections.A statistical variable is defined to study the collective behavior and phase transition of the spiral wave due to the channel noise and topology of the *** effect of small-world connection networks is described by local regular networks and long-range connection with certain probability *** numerical results confirm that (1) a stable rotating spiral wave can be developed and maintain robust with low p,where the breakup of the spiral wave and turbulence result from increasing the probability p to a certain threshold;(2) appropriate intensity of the optimized channel noise can develop a spiral wave among turbulent states in small-world connection networks of H-H neurons;and (3) regular connection networks are more robust to channel noise than small-world connection networks.A spiral wave in a small-world network encounters instability more easily as the membrane temperature is increased to a certain high threshold.

关键词：神经元网络信道噪声螺旋波赫胥黎小世界网络连接网络金耦合连接