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THE STABILITY OF LINEAR MULTISTEP METHODS FOR LINEAR SYSTEMS OF NEUTRAL DIFFERENTIAL EQUATIONS

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Journal of Computational Mathematics 2001年第2期19卷 125-130页

作者： Hong-jiong tian jiao-xun Kuang Lin Qiu Department of Mathematics the University of Manchester Oxford RoadManchester M13 9PLUK Department of Mathematics Shanghai Normal UniversityShanghai 200234China Graduate School of Human Informaticss Nagoya 464-8601Japan

Presents information on a study which focused on the numerical solution of initial value problems for systems of neutral differential equations. Adaptations of linear multistep methods; Linear stability of linear mult... 详细信息

关键词： numerical stability linear multistep method delay differential equations

Quantum steerability of two qubits mediated by one-dimensional plasmonic waveguides

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Chinese Physics B 2022年第12期31卷 74-80页

作者： Ye-Qi Zhang Xiao-Ting Ding jiao Sun tian-Hu wang Department of Mathematics and Physics North China Electric Power UniversityBeijing 102206China School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing 102206China

We study the dynamics of the quantum steering between two separated qubits trapped in a one-dimensional plasmonic *** numerical methods,we calculate the quantum steerability and other quantum correlations,i.e.,entanglement,discord,and coherence,for both cases with and without laser driving *** is found that steerability may exhibit a sudden disappearance and sudden reappearance ***,there exist time windows with no steerability but finite *** effects of plasmon wavenumber and the distance between the two qubits on steerability are also ***,we show that quantum steerability is tunable by adjusting the laser driving fields.

关键词： quantum steering quantum correlations plasmonic waveguide

Effect of endothelin-1 in esophageal squamous cell carcinoma invasion and its correlation with cathepsin B

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World Journal of Gastroenterology 2007年第29期13卷 4002-4005页

作者： Wen-Jie jiao Jing Xu Hao Pan tian-You wang Yi Shen Department of Thoracic Surgery Peking University First Hospital Beijing 100034 China Department of Thoracic Surgery Committee of Disciplinary Inspection the Affiliated Hospital of Qingdao University Medical College Qingdao 266003 Shandong Province China Department of Thoracic Surgery Beijing Friendship Hospital Beijing 100050 China

AIM： To investigate the effect of endothelin-1 in the invasion of esophageal cancer and determine whethel cathepsin B plays a role in the course. METHODS： Western blotting was employed tc detect the expression of ET-1 protein in 75 sample., of esophageal squamous cell cancer and matched normal esophageal rnucosa. Bosentan, a dual ET （A/B）- receptor antagonist, was used to inhibit the binding of endothelin-1 and its receptors and cut down its biological role. In vitro matrigel invasion assays were made to show the invasive ability of esophageal cancer cells with and without bosentan. Subsequently, we evaluated cathepsin B activity and expression in EC9706 cell with and without bosentan. RESULTS： We found 74.7% （56/75） tumors had an overexpression of ET-1 protein by Western blotting. Bosentan significantly inhibited matrigel invasion of cancer cells in vitro. EC9706 cells have a positive expression of cathepsin B protein, and bosentan can down-regulate its expression and activity. CONCLUSION： Endothelin-1 may enhance the invasive ability of human esophageal cancer cells, and its role is correlated with cathepsin B.

关键词： Esophageal tumor Endothelin Cathepsin Invasion

Dynamic evaluation of a scaled-down heat pipe-cooled system during start-up/shut-down processes using a hardware-in-the-loop test approach

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Nuclear Science and Techniques 2023年第11期34卷 174-198页

作者： jiao‑Long Deng tian‑Shi wang En‑Ping Zhu Shuo Yuan Xiao‑Jing Liu Xiang Chai School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Micro-mobile heat pipe-cooled nuclear power plants are promising candidates for distributed energy resource power genera-tors and can be flexibly deployed in remote places to meet increasing electric power ***,previous steady-state simulations and experiments have deviated significantly from actual micronuclear system ***,a transient analysis is required for performance optimization and safety *** this study,a hardware-in-the-loop(HIL)approach was used to investigate the dynamic behavior of scaled-down heat pipe-cooled *** real-time features of the HIL architecture were interpreted and validated,and an optimal time step of 500 ms was selected for the thermal *** power transient was modeled using point kinetic equations,and a scaled-down thermal prototype was set up to avoid mod-eling unpredictable heat transfer behaviors and feeding temperature samples into the main program running on a desktop PC.A series of dynamic test results showed significant power and temperature oscillations during the transient process,owing to the inconsistency of the rapid nuclear reaction rate and large thermal *** proposed HIL approach is stable and effective for further studying of the dynamic characteristics and control optimization of solid-state small nuclear-powered systems at an early prototyping stage.

关键词： Micro-heat pipe-cooled nuclear reactor Hardware-in-the-loop Dynamic evaluation Start-up/shut-down processes

Tuning precise numbers of supported nickel clusters on graphdiyne for efficient CO_(2)electroreduction toward various multi-carbon products

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Journal of Energy Chemistry 2022年第6期31卷 456-465,I0013页

作者： Meiqi Yang Zhongxu wang Dongxu jiao Yu tian Yongchen Shang Lichang Yin Qinghai Cai Jingxiang Zhao College of Chemistry and Chemical Engineering Key Laboratory of Photonic and Electronic Bandgap MaterialsMinistry of EducationHarbin Normal UniversityHarbin 150025HeilongjiangChina Institute for Interdisciplinary Quantum Information Technology Jilin Engineering Normal UniversityChangchun 130052JilinChina Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina Heilongjiang Province Collaborative Innovation Center of Cold Region Ecological Safety Harbin 150025HeilongjiangChina

Compared to single-atom catalysts,supported metal clusters can exhibit enhanced activity and designated selectivity in heterogeneous catalysis due to their unique geometric and electronic ***,by means of comprehensive density functional theory (DFT) computations,we systematically investigated the potential of several Ni clusters supported on graphdiyne (Ni_(x)/GDY,x=1–6) for CO_(2) reduction reaction (CO_(2)RR).Our results revealed that,due to the strong interaction between Ni atoms and sp-hybridized C atoms,these supported Ni clusters on GDY exhibit high stabilities and excellent electronic *** particular,according to the computed free energy profiles for CO_(2)RR on these Ni_(x)/GDY systems,the anchored Ni_(4) cluster was revealed to exhibit high CO_(2)RR catalytic activity with a small limiting potential and moderate kinetic barrier for C–C coupling,and CH_(4),C_(2)H_(5)OH,and C_(3)H_(7)OH were identified as the main products,which can be attributed to its strong capacity for CO_(2) activation due to its unique configuration and excellent electronic ***,by carefully controlling the precise numbers of atoms in sub-nano clusters,the spatially confined Ni clusters can perform as promising CO_(2)RR catalysts with high-efficiency and high-selectivity,which may provide a useful guidance to further develop novel and low-cost metal clusters-based catalysts for sustain CO_(2)conversion to valuable chemicals and fuels.

关键词： CO_(2)reduction Supported metal clusters Graphdiyne Multi-carbon products Density functional theory

Myocarditis as an extraintestinal manifestation of ulcerative colitis:A case report and review of the literature

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World Journal of Clinical Cases 2022年第27期10卷 9750-9759页

作者： You-Yang wang Wen Shi Jian wang Yue Li Zhuang tian Yang jiao Department of General Internal Medicine Peking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China Department of Gastroenterology Peking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China Department of Radiology Peking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China Department of Cardiology and International Medical Service Peking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China

BACKGROUND Although extraintestinal manifestations of inflammatory bowel disease(IBD) are well documented,myocarditis has only rarely been reported as an extraintestinal manifestation,and it can be *** various clinical presentations and causes of myocarditis in IBD patients complicate making a correct and timely *** SUMMARY Here we report a 15-year-old boy who presented with myocarditis as the initial presentation of a relapse of ulcerative *** reviewing the literature for cases of myocarditis complicating IBD,we found 21 other cases,allowing us to expand our understanding of the clinical presentation,diagnosis,management,and outcomes of this rare *** most frequent diagnostic clues for myocarditis in IBD patients are dyspnea,chest pain,tachycardia,raised cardiac biomarkers,and abnormalities on trans-thoracic ***,we discuss the etiology of myocarditis in IBD patients,which include an extraintestinal manifestation,the adverse effects of mesalamine and infliximab,selenium deficiency,and infection,to help provide a framework for diagnosis and *** Myocarditis as an extraintestinal manifestation of IBD can be ***-thoracic echocardiogram and cardiac magnetic resonance may assist its diagnosis.

关键词： Inflammatory bowel disease Myocarditis Ulcerative colitis Crohn’s disease Extraintestinal manifestation Case report

Comparison of the Surface and Underground Natural Gas Occurrences in the Tazhong Uplift of the Tarim Basin

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Acta Geologica Sinica(English Edition) 2010年第5期84卷 1097-1115页

作者： tian Jun CHEN Junqing jiao jiao PANG Xiongqi Tarim Oilfield Company PetroChina Korla Xinjiang 841000 China State Key Laboratory of Petroleum Resource and Prospecting （China University of Petroleum） Beijing 102249 China Basin and Reservoir Research Center China University of Petroleum （Beijing） Beijing 102249 China

The oil, gas and water volumes revealed by the productivity of exploratory wells do not reflect the actual underground situations. Under the geologic conditions, a certain amount of dissolved natural gas is stored in oil or water. Based on the production test data of exploratory wells in the Tazhong uplift of the Tarim basin, this paper discusses in detail the differences in occurrence and distribution featrues between the surface and underground natural gases; presents a restoration of the surface gas occurrence to actual underground geologic conditions according to the dissolubility of natural gas under different temperature, pressure and medium conditions; and classifies the natural gas into three states, i.e. the oversaturated, saturated and undersaturated, according to its relative content underground. Through a comparative analysis of the differences in surface and underground occurrences of natural gas, it discusses the hydrocarbon reservoir formation mechanism and distribution rules, thereby providing guidances as new methods and technologies for the prediction of potential natural gas reservoir distribution in the study area.

关键词： Tarim basin Tazhong uplift natural gas occurrence features

Vertical deformation analysis based on combined adjustment for GNSS and leveling data

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Geodesy and Geodynamics 2023年第5期14卷 477-484页

作者： Jianliang Nie Jie tian Xinwei Guo Bin wang Xiaoyun Liu Yaxuan Cheng Pengtao jiao Geodetic Data Processing Center of Ministry of Natural Resources Shaanxi Bureau of Surveying Mapping and GeoinformationXi'an 710054China Geodetic Data Processing Center of Ministry of Natural Resources Xi'an 710054China The First Geodetic Surveying Bridge of Ministry of Natural Resources Xi'an 710054China The Second Topographic Surveying Brigade of Natural Resources Xi'an 710054China

A method is proposed to fuse the velocity data of the global navigation satellite system(GNSS) and leveling height via combined adjustment with constraints. First, stable GNSS-leveling points are uniformly selected, and the constraints of the geodetic height change velocity and normal height change velocity are given. Then, the GNSS vertical velocities and leveling height difference are used as observations of combined adjustment, and robust least-squares estimation are used to estimate the velocities of the unknown points. Finally, a vertical movement model is established with the GNSS vertical velocities and leveling vertical velocities obtained via combined adjustment. Data from the second-order leveling network and GNSS control points in Shandong Province are taken as test data, and eight calculation schemes are used for discussion. One of the schemes, the bifactor robust combined adjustment method based on variance component estimation with two kinds of vertical velocity constraints achieves the optimal results. The method applied in the scheme can be recommended for data fusion of GNSS and leveling, further improving the reliability of vertical crustal movement in Shandong Province.

关键词： Vertical crustal movement GNSS Leveling Robust adjustment Data fusion

A pseudoclassical theory for the wavepacket dynamics of the kicked rotor model

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Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 34-43页

作者： Zhixing Zou jiao wang Department of Physics and Key Laboratory of Low Dimensional Condensed Matter Physics(Department of Education of Fujian Province) Xiamen UniversityXiamen 361005China Lanzhou Center for Theoretical Physics Lanzhou UniversityLanzhou 730000China

In this study, we propose a generalized pseudoclassical theory for the kicked rotor model in an attempt to discern the footprints of the classical dynamics in the deep quantum regime. Compared with the previous pseudoclassical theory that applies only in the neighborhoods of the lowest two quantum resonances, the proposed theory is applicable in the neighborhoods of all quantum resonances in principle by considering the quantum effect of the free rotation at a quantum resonance. In particular, it is confirmed by simulations that the quantum wavepacket dynamics can be successfully forecasted based on the generalized pseudoclassical dynamics, offering an intriguing example where it is feasible to bridge the dynamics in the deep quantum regime to the classical dynamics. The application of the generalized pseudoclassical theory to the PT-symmetric kicked rotor is also discussed.

关键词： quantum-classical correspondence kicked rotor model pseudoclassical theory wavepacket dynamics