检索结果-南通市图书馆

Dirichlet problem for Schrodinger equation with the boundary value in the BMO space

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2022年第7期65卷 1431-1468页

作者： Renjin jiang bo Li Center for Applied Mathematics Tianjin UniversityTianjin 300072China College of Data Science Jiaxing UniversityJiaxing 314001China

Let(X,d,μ)be a metric measure space satisfying a Q-doubling condition(Q>1)and an L^(2)-Poincaré*** L=L+V be a Schrödinger operator on X,where L is a non-negative operator generalized by a Dirichlet form,and V is a non-negative Muckenhoupt weight that satisfies a reverse Hölder condition RH_(q) for some q≥(Q+1)/*** show that a solution to(L−∂_(t)^(2))u=0 on X×R_(+) satisfies the Carleson condition,sup_(B(xB,rB))1/μ(B(xB,rB))∫_(0)^(rB)∫_(B(xB,rB))|t∇u(x,t)|^(2)dμdt/tbounded mean oscillation)space associated with L.

关键词： Schrodinger equation BMO Carleson measure metric measure space

Tight sandstone gas accumulation mechanisms and sweet spot prediction, Triassic Xujiahe Formation, Sichuan Basin, China

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2023年第6期20卷 3301-3310页

作者： Lin jiang Wen Zhao Dong-Mei bo Feng hong Yan-Jie Gong Jia-Qing Hao Research Institute of Petroleum Exploration and Development PetroChinaBeijing100083China

The prediction of continental tight sandstone gas sweet spots is an obstacle during tight sandstone gas exploration. In this work, the classic physical fluid charging experimental equipment is improved, the combination of the gas migration and accumulation process with the pore network numerical simulation method is investigated, and application of the permeability/porosity ratio is proposed to predict the gas saturation and sweet spots of continental formations. The results show that (1) as the charging pressure increases, the permeability of the reservoir increases because more narrow pore throats are displaced in the percolation process;and (2) based on pore network numerical simulation and theoretical analysis, the natural gas migration and accumulation mechanisms are revealed. The gas saturation of tight sandstone rock is controlled by the gas charging pressure and dynamic percolation characteristics. (3) The ratio of permeability/porosity and fluid charging pressure is proposed to predict the gas saturation of the formation. The ratio is verified in a pilot and proven to be applicable and practical. This work highlights the tight sandstone gas migration and accumulation mechanisms and narrows the gap among microscale physical experiments, numerical simulation research, and field applications.

关键词： Tight sandstone gas Hydrocarbon migration and accumulation Physical experiment Numerical simulation

Competitive Cloud Pricing for Long-Term Revenue Maximization

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2019年第3期34卷 645-656页

作者： jiang Rong Tao Qin bo An Institute of Computing Technology Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Microsoft Research Asia Beijing 100080China School of Computer Science and Engineering Nanyarig Technological UniversitySingapore 639798Singapore

We study the pricing policy optimization problem for cloud providers while considering three properties of the real-world market:1)providers have only incomplete information about the market;2)it is in evolution due to the increasing number of users and decreasing marginal cost of providers:3)it is fully competitive because of providers'and users'revenuedriven *** far as we know,there is no existing work investigating the optimal pricing policies under such realistic *** first propose a comprehensive model for the real-world cloud inarket and formulatc it as a stochastic *** we use the Markov perfect equilibrium(MPE)to describe providers5 optimal *** we decompose the problem of computing the MPE into two subtasks:1)dividing the stochastic game into many normal-formal games and calculating their Nash equilibria,for which we develop an algorithm ensuring to converge,and 2)computing the MPE of the original game,which is efficiently solved by an algorithm combining the Nash equilibria based on a mild *** results show that our algorithms are efficient for computing MPE and the MPE strategy leads to much higher profits for providers compared with existing policies.

关键词： cloud computing Markov perfect equilibrium game theory revenue maximization

A PROJECTION-TYPE METHOD FOR SOLVING VARIOUS WEBER PROBLEMS

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

Journal of Computational Mathematics 2006年第4期24卷 527-538页

作者： Jian-lin jiang bo Chen Department of Mathematics Nanjing University Nanjing 210093 China

This paper investigates various Weber problems including unconstrained Weber problems and constrained Weber problems under l1, l2 and l∞-norms. First with a transformation technique various Weber problems are turned into a class of monotone linear variational inequalities. By exploiting the favorable structure of these variational inequalities, we present a new projection-type method for them. Compared with some other projection-type methods which can solve monotone linear variational inequality, this new projection-type method is simple in numerical implementations and more efficient for solving this class of problems; Compared with some popular methods for solving unconstrained Weber problem and constrained Weber problem, a singularity would not happen in this new method and it is more reliable by using this new method to solve various Weber problems.

关键词： Linear variational inequality Various Weber problems Projection-type method Slack technique.

Metabolite profiling of Zi-Shen pill in rat biological specimens by UPLC-Q-TOF/MS

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

Chinese Journal of Natural Medicines 2015年第2期13卷 145-160页

作者： LIU Xiao-Wei ZHANG Feng GAO Shou-hong jiang bo CHEN Wan-Sheng Department of Pharmacy Changzheng Hospital Second Military Medical University

This study aimed to profile the chemical constituents of Zi-Shen pill(ZSP) and its metabolites in plasma, urine, and prostate tissue, after administration into rats. Based on the chromatographic retention behavior, fragmentation patterns of chemical components, published literatures, and literature databases, an UPLC-Q-TOF/MS(LC-TOF/MS) method was established to identify the components of ZSP and its metabolites in biological samples. A total of 101 compounds were identified and tentatively characterized from the ZSP, including alkaloids, xanthones, and timosaponins. Except for 33 prototype components, 22 metabolites were detected in the plasma, urine, and prostate, and mainly came from Phellodendri Amurensis Cortex and Anemarrhenae Rhizoma. It was found that glucuronidation and sulfation were the major metabolic processes of xanthones, while oxidation, demethylation, and glucuronidation were the major metabolic pathways of alkaloids. In summary, the present study provided important chemical information on the metabolism of ZSP, indicating that alkaloids might be able to be absorbed into the prostate. The results provided a basis for further studies of the mechanisms of action for ZSP.

关键词： UPLC-Q-TOF/MS Zi-Shen pill Chemical constituents Metabolites

Mechanical thrombectomy for acute occlusion of the posterior inferior cerebellar artery: A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第10期9卷 2268-2273页

作者： hong-bo Zhang Pian Wang Yan Wang jiang-hong Wang Zheng Li Rong Li Department of Neurology Chengdu Fifth People's HospitalChengdu 611130Sichuan ProvinceChina

BACKGROUND Mechanical thrombectomy(MT)has been demonstrated to be useful for the treatment of ischemic stroke in patients with large vessel ***,recanalization by MT is not recommended for distal vessels such as second-order branches of the middle cerebral artery and posterior inferior cerebellar artery(PICA).Because of the small size and tortuosity of these arteries,the risks of using the available endovascular devices outweigh the benefits of ***,MT appears to be effective in patients with primary distal vessel occlusion in eloquent areas,those with a high National Institutes of Health Stroke Scale score,and those ineligible for recombinant tissue plasminogen activator ***,we report the use of MT for treating acute occlusion of the PICA using a directaspiration first-pass technique(ADAPT).CASE SUMMARY In this case,the patient received acute occlusion of the PICA with ADAPT when right internal carotid artery stenting was *** With the introduction of advanced endovascular devices,MT may now be a feasible treatment for acute occlusion of the PICA.

关键词： Posterior inferior cerebellar artery Mechanical thrombectomy Ischemic stroke Carotid artery stent Neurovascular interventions Case report

Coupling of small-and large-scale filament eruptions

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

Research in Astronomy and Astrophysics 2016年第1期16卷 23-30页

作者： Jia-Yan Yang Yun-Chun jiang bo Yang Jun-Chao hong Zhe Xu Yunnan Observatories Chinese Academy of Sciences Kunming 650011 China University of Chinese Academy of Sciences Beijing 100049 China

We present observations of the eruption of a large-scale quiescent filament （LF） that is associated with the formation and eruption of a miniature filament （MF）. As a result of convergence and subsequent cancelation of opposite-polarity magnetic flux, MF was formed just below the spine of the LF＇s right seg- ment. Probably triggered by a nearby newly emerging flux, MF underwent a failed eruption immediately after its full development, which first ejected away from the spine of LF and then drained back to the Sun. This eruption no sooner started than the overlying LF＇s right segment began to rise slowly and the LF＇s other parts were also disturbed, and eventually the whole LF erupted bodily and quickly. These observa- tions suggest that the MF can serve as an intermediary that links the photospheric small-scale magnetic-field activities to the eruption of the overlying large filament. It appears that, rather than directly interacting with the supporting magnetic field of LF, small-scale flux cancelation and emergence in the LF＇s channel can manifest themselves as the formation and eruption of MF and so indirectly affect the stability of LE

关键词： Sun: activity -- Sun: filaments -- Sun: magnetic fields

Comparative Study on Soot Reduction, Soot Nanostructure and Oxidation Reactivity of n-heptane/DMC and Isooctane/DMC Inverse Diffusion Flames

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2020年第5期29卷 1269-1281页

作者： jiang bo PALADPOKKRONG Chutikarn LIU Dong MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China Advanced Combustion Laboratory School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China jiangsu Province Key Laboratory of Aerospace Power System Nanjing 210016China

Dimethyl carbonate(DMC)is an environmentally oxygenated compound which can be used efficiently for soot *** paper compared the soot reduction,soot nanostructure and oxidation reactivity from inverse diffusion flames(IDFs)of the hydrocarbon fuels,namely n-heptane and isooctane doped with *** of DMC additions on soot reduction were *** addition is more effective for the soot reduction of n-heptane/DMC IDF than isooctane/DMC *** morphology and nanostructures of soot particles were investigated by Transmission Electron Microscopy(TEM)and High Resolution TEM(HRTEM),and the soot graphitization and oxidation reactivity were analyzed by X-ray Diflfraction(XRD)and Thermogravimetric Analyzer(TGA),*** results of HRTEM images showed that many larger aggregates were observed for the structures of soot particles from IDFs with DMC *** soot particles exhibited more liquid-like material,more amorphous,higher disorganized layers,and less graphitic than that of IDFs without DMC *** increasing of DMC blending rate,soot particles changed younger to have shorter fringe length,higher tortuosity,and greater fringe *** on the XRD and TGA results,the degree of the soot graphitization level decreased;the soot mass lost significantly faster,and the soot become more reactive.

关键词： inverse diffusion flame n-heptane/DMC isooctane/DMC soot reduction soot nanostructure oxidation reactivity

Numerical Study on Flow Heat Transfer Characteristics of Horizontal Tube Falling-Film Evaporator

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2021年第4期30卷 1302-1317页

作者： XU bo jiang Chun CHEN Zhenqian School of Energy and Environment Southeast UniversityNanjing 210096China jiangsu Provincial Key Laboratory of Solar Energy Science and Technology School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

As an efficient and energy-saving heat exchange technology, horizontal tube falling film evaporation has a great application prospect in refrigeration and air conditioning. The three-dimensional models of falling film flow evaporation outside horizontal single tube and inside evaporator were established, and the accuracy of flow and heat transfer simulation process was verified by comparison. For horizontal single tube, the results showed that total heat transfer coefficient was low and increased with larger spray density and evaporation temperature. The thickness of liquid film outside tube decreased gradually with the increase of tube diameter, and the total heat transfer coefficient of small tube diameter was significantly greater than that of the large tube diameter. The total heat transfer coefficient presented an increasing trend with larger liquid distribution height and density. In addition, the fluctuation of tube axial liquid film thickness distribution decreased with larger liquid distribution density. For evaporator, the results indicated that part of liquid refrigerant was carried into the vapor outlet. The temperature of tube wall and fluid presented a gradually rising trend in vertical downward direction, while tube wall temperature within the same horizontal and transverse row had little difference. The high-temperature zone on the outer wall of heat exchange tube moved towards the inlet and gradually decreased, and the outlet temperature of water in the tube also gradually decreased with the increase of refrigerant spray density. The local heat transfer coefficient of heat exchanger tube in the vertical direction presented a downward trend which was more obvious with the smaller spray density and it was obviously higher located in the middle of upper tube row and both sides of lower tube row for horizontal tube rows.

关键词： horizontal single tube evaporator falling film numerical simulation heat transfer