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A HYBRID EXPLICIT-IMPLICIT SCHEME FOR THE TIME-DEPENDENT WIGNER EQUATION

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Journal of Computational Mathematics 2021年第1期39卷 22-42页

作者： Haiyan Jiang Tiao Lu xu yin Department of Mathematics and Statistics Beijing Institute of TechnologyBeiing 100081China CAPT HEDPSLMAMIFSA Collaborative Innovation Center of MoESchool of Mathematical SciencesPeking UniversityBeijing 100871China Department of Mathematics and Statistics Beijing Institute of TechnologyBeijing 100081China

This paper designs a hybrid scheme based on finite difference methods and a spectral method for the time-dependent Wigner equation,and gives the error analysis for the full discret ization of its initial value *** explicit-implicit time-splitting scheme is used for time integration and the second-order upwind finite difference scheme is used to dis-cretize the advection *** consistence error and the stability of the full discretization are analyzed.A Fourier spectral method is used to approximate the pseudo-differential operator term and the corresponding error is studied in *** final convergence result shows clearly how the regularity of the solution affects the convergence order of the pro-posed scheme.N umerical results are presented for confirming the sharpness of the *** scattering effects of a Gaussian wave packet tunneling through a Gaussian potential barrier are *** evolution of the density function shows that a larger portion of the wave is reflected when the height and the width of the barrier *** subject classification:65M06,65M70.

关键词： Finite diference method Spectral method Hybrid scheme Error analysis Wigner equation.

Synthesis and properties of ionic conduction polymer for anodic bonding

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Chinese Chemical Letters 2015年第3期26卷 289-292页

作者： xu yin Cui-Rong Liu Tai Yuan University of Science and Technology

In this study,powders of polyethylene oxide（PEO） and lithium perchlorate（Li Cl O4） were used as the raw materials for producing the ionic conduction polymer PEO–Li Cl O4 with different complex-ratios and used for anodic bonding through high energy ball milling method,and meanwhile,X-ray diffraction,differential scanning calorimetry（DSC）,ultraviolet absorption spectrum test analysis,and other relevant methods were adopted to research the complexation mechanism of PEO and Li Cl O4 and the impact of the ionic conduction polymer with different complex-ratios on the anodic bonding process under the action of the strong static electric *** research results showed that the crystallization of PEO could be effectively obstructed with increased addition of Li Cl O4,thus increasing the content of PEO–Li Cl O4 in amorphous area and continuously improving the complexation degree and the room-temperature conductivity thereof,and that the higher room-temperature conductivity enabled PEO–Li Cl O4 to better bond with metallic aluminum and have better bonding *** the new encapsulating material,such research results will promote the application of new polymer functional materials in micro-electromechanical system（MEMS） components.

关键词： anodic conduction bonding ionic ultraviolet metallic amorphous calorimetry milling encapsulation

Precise Control of Self-assembly in vivo Based on Polymer-Peptide Conjugates

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Chinese Journal of Chemistry 2022年第23期40卷 2815-2824页

作者： yin-Sheng xu Hao Wang Zeng-ying Qiao CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology(NCNST)Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100190China

The self-assembled nanomaterials based on peptides,which have not only good biocompatibility and low toxicity but also high stability and performance,are increasingly becoming an important way for cancer *** this review,we highlight the progress of in vivo self-assembled polymer-peptide conjugates(PPCs)and their application,showing the recent advances in the development of“in vivo self-assembly”strategy for cancer *** the diverse microenvironments of tumor cells,different responsive assembly strategies(enzyme,pH,redox,temperature,etc.)have been developed to precisely control the assembly at different biological levels,realizing enhanced drug delivery and improved anticancer efficacy.

关键词： Polymer-peptide conjugates Drug design In vivo self-assembly Drug delivery Antitumor agents

Optimization of Distributed Integrated Multi-energy System Considering Industrial Process Based on Energy Hub

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Journal of Modern Power Systems and Clean Energy 2020年第5期8卷 863-873页

作者： Yizhi Zhang Xiaojun Wang Jinghan He yin xu Wei Pei IEEE School of Electrical Engineering Beijing Jiaotong UniversityBeijing 100044China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China

As a typical scenario of distributed integrated multi-energy system(DIMS),industrial park contains complex production constraints and strong associations between industrial productions and energy *** industrial production process(IPP)consists of controllable subtasks and strict timing *** IPP as a control variable of optimal scheduling,it is an available approach that models the IPP as material flow into an extension energy hub(EH)to achieve the optimization of industrial *** this paper,considering the coupling between the production process and energy demands,a model of IPP is proposed by dividing the process into different adjustable steps,including continuous subtask,discrete subtask,and storage ***,a transport model of material flow is used to describe the IPP in an industrial park *** on the concept of EH,a universal extension EH model is proposed considering the coupling among electricity,heat,cooling,and ***,an optimal scheduling method for industrial park DIMS is proposed to improve the energy efficiency and operation ***,a case study of a typical battery factory is shown to illustrate the proposed *** simulation results demonstrate that such a method reduces the operation cost and accurately reflects the operation state of the industrial factory.

关键词： Distributed integrated multi-energy system(DIMS) industrial production process(IPP) energy hub(EH) optimal operation battery production

Flat-end tool orientation based on rotation-minimizing frame

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Advances in Manufacturing 2019年第3期7卷 257-269页

作者： Xiang Zou Hon-Yuen Tam Hai-yin xu Ke Shi School of Computer Science and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic of China College of Science and Engineering Department of Mechanical EngineeringCity University of Hong KongHong KongPeople's Republic of China

Well-designed tool orientation is crucial for the quality execution of five-axis machining with flat-end *** orientation can be specified in terms of tool inclination and tool tilt *** a given surface path,these aspects need to be specified for each cutter contact point along the path,because poor tool orientation choice can cause large axial acceleration of the machine tool,leading to inferior quality of the machined *** rotation-minimizing frame aims to reduce unnecessary frame rotation during *** concept has been adopted to develop tool orientation methods that allow variation in the inclination angle,the tilt angle,and both the inclination and tilt *** intention is to reduce unnecessary rotation of the tool frame as the tool follows a specified *** was conducted in the context of five-axis flat-end tool *** on these methods,tool orientation was planned along surface paths of a torus,sphere,and *** in tool orientation were always *** the perspective of reducing tool orientation changes and axial acceleration,it was demonstrated that simultaneous variation of the inclination and tilt angles based on rotation minimization provided the best results.

关键词： Five-axis machining Tool orientation Rotation-minimizing frame Numerical control

Purinergic Signaling in the Central Nervous System in Health and Disease

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Neuroscience Bulletin 2020年第11期36卷 1239-1241页

作者： Peter Illes Guang-yin xu Yong Tang International Collaborative Centre on Big Science Plan for Purine Signaling Chengdu University of Traditional Chinese MedicineChengdu 610075China Rudolf-Boehm-Institut fur Pharmakologie und Toxikologie Universitaet LeipzigLeipzig 04107Germany Institute of Neuroscience Soochow UniversitySuzhou 215123China Acupuncture and Chronobiology Key Laboratory of Sichuan Province Chengdu 610075China

The existence of purinergic signaling—the idea that almost all cells of the animal/human organism are able to communicate with each other via extracellular purines—was proposed by Geoffrey Burnstock(1929-2020)in 1972[1-3].The purinergic system includes the following constituents:(1)the four main purines:adenosine triphosphate(ATP)and its metabolites,adenosine diphosphate(ADP),adenosine monophosphate(AMP),and adenosine(ADO);(2)three key enzymes,the ectonucleoside triphosphate diphosphohydrolases(E-NTPDases:NTPDase1/CD39),ectonucleotide pyrophosphatase/phosphodiesterases(E-NPP),and ecto-5’-nucleotidase(E-5’-nucleotidase/CD73),which decompose ATP into ADP,AMP,and ADO.

关键词： ADO urine include

Targeting voltage-gated sodium channels for treatment for chronic visceral pain

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World Journal of Gastroenterology 2011年第19期17卷 2357-2364页

作者： Fei-Hu Qi You-Lang Zhou Guang-yin xu Jiangsu Key Laboratory of Neuroregeneration Nantong University Nantong22600 I Jian~su Province China Institute of Neuroscience Key laboratory of Pain Research and Therapy Soochow University Suzhou 215123Jiangsu Province China Division of Gastroenterology Department of Internal Medicine University of Texas Medical Branch Galve-ston TX 77555-0655 United States

Voltage-gated sodium channels (VGSCs) play a fundamental role in controlling cellular excitability,and their abnormal activity is related to several pathological processes,including cardiac arrhythmias,epilepsy,neurodegenerative diseases,spasticity and chronic *** particular,chronic visceral pain,the central symptom of functional gastrointestinal disorders such as irritable bowel syndrome,is a serious clinical problem that affects a high percentage of the world *** spite of intense research efforts and after the dedicated decade of pain control and research,there are not many options to treat chronic pain ***,there is a wealth of evidence emerging to give hope that a more refined approach may be *** using electronic databases,available data on structural and functional properties of VGSCs in chronic pain,particularly functional gastrointestinal hypersensitivity,were *** summarize the involvement and molecular bases of action of VGSCs in the pathophysiology of several organic and functionalgastrointestinal *** also describe the efficacy of VGSC blockers in the treatment of these neurological diseases,and outline future developments that may extend the therapeutic use of compounds that target ***,clinical and experimental data indicate that isoform-specific blockers of these channels or targeting of their modulators may provide effective and novel approaches for visceral pain therapy.

关键词： Voltage-gated sodium channel Dorsal root ganglion Visceral pain Functional gastrointestinal disorders Treatment

Recent advances towards catalytic asymmetric Conia-ene-type reactions

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Chinese Chemical Letters 2021年第3期32卷 954-962页

作者： En-Ze Lin yin xu Kegong Ji Long-Wu Ye College of Chemistry and Pharmacy Northwest A&F UniversityShaanxi Key Laboratory of Natural Products&Chemical BiologyYangling 712100China The Key Laboratory for Chemical Biology of Fujian Province and State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China State Key Laboratory of Organometallic Chemistry Chinese Academy of SciencesShanghai 200032China

Conia-ene reactions,as a type of ene reactions,have not become a remarkable focus until the beginning of21st century,when Lewis acids served as powerful catalysts and found an increasingly broad utilization in this ***,the catalytic Conia-ene reactions have gained great significance in synthetic chemistry due to their high efficiency and atom economy on the construction of valuable cyclic *** the past two decades,the rapid development of transition-metal catalysis and organocatalysis has imposed a profound impact on the exploration of asymmetric Conia-ene *** a result,several strategies have been developed and applied *** on the basis of the catalytic system,this review comprehensively presents a summary of recent progress achieved in this emerging domain,aimed at highlighting the reactions’features,practicalities,and the mechanistic rationale is presented where possible.

关键词： Conia-ene reaction Asymmetric catalysis Transition metals Organocatalysts

Spatiotemporal Pattern of Cultivated Land Pressure and Its Influencing Factors in the Huaihai Economic Zone, China

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Chinese Geographical Science 2023年第2期33卷 287-303页

作者： LI Yi FANG Bin LI Yurui FENG Weilun yin xu School of Geography Nanjing Normal UniversityNanjing 210023China Research Center of New Urbanization and Land Problem Nanjing Normal UniversityNanjing 210023China Jiangsu Provincial Geographic Information Resources Development and Utilization Cooperative Innovation Center Nanjing 210023China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China Key Laboratory of Regional Sustainable Development Modeling Chinese Academy of SciencesBeijing 100101China School of Geographic Science Hebei Normal UniversityShijiazhuang 050024China

Cultivated land pressure represents a direct reflection of grain security. Existing relevant studies rarely approached the spatiotemporal pattern of cultivated land pressure or the spatial heterogeneity of its influencing factors from the level of economic *** the Huaihai Economic Zone(HEZ), China for case analysis, this study investigated the spatiotemporal pattern of cultivated land pressure in diverse periods from 2000 to 2018 based on a modified cultivated land pressure index and spatial correlation models. On this basis, it explored the influencing factors of the spatial differentiation of cultivated land pressure in the late stage of the study using geographical detector as well as multi-scale geographically weighted regression model. The results indicated that: 1) in the study period, the global cultivated land pressure index of the study area decreased gradually, but cultivated land pressure increased locally in a significant way, especially in the central and southern Shandong Province;2) the spatial pattern of cultivated land pressure manifested global clustering features. Hot and secondary-hot spots presented a narrowing and clustering trend, whereas cold and secondary-cold spots manifested a spreading and clustering trend;3) average slope, the proportion of non-grain crops, population urbanization rate, and multiple cropping index have significant effects on the spatial differentiation of cultivated land pressure. The former three factors were positively correlated with cultivated land pressure, and the last factor was negatively correlated with cultivated land pressure;and 4) the amount of cultivated land has increased in the central and southern Shandong Province through land consolidation which, nonetheless, failed to improve the grain production. In regards to major grain producing areas similar to the HEZ in China, the authors suggest that great importance should be given to the balance of the quality and quantity of cultivated land, the op

关键词： cultivated land pressure spatiotemporal pattern influencing factors Huaihai Economic Zone China