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GLOBAL WELL-POSEDNESS OF THE 2D BOuSSINESQ EQuATIONS WITH PARTIAL DISSIPATION

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Acta Mathematica Scientia 2022年第4期42卷 1293-1309页

作者： Xueting jin Yuelong Xiao Huan Yu School of Mathematical Sciences Capital Normal UniversityBeijing 100048 China School of Mathematics and Computational Science Xiangtan UniversityHunan411105China School of Applied Science Beijing Information Science and Technology UniversityBeijing 100192China

In this paper,we prove the global well-posedness of the 2 D Boussinesq equations with three kinds of partial dissipation;among these the initial data(u_(0),θ_(0))is required such that its own and the derivative of one of its directions(x,y)are assumed to be L^(2)(R^(2)).Our results only need the lower regularity of the initial data,which ensures the uniqueness of the solutions.

关键词： Two-dimensional Boussinesq equations global well-posedness partial dissipation and diffusion

Preface to the special issue: novel applications of main refractory metals and their compounds

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Tungsten 2020年第3期2卷 215-216页

作者： jin‑Shu Wang Jun Wang Key Laboratory of Advanced Functional Materials Education Ministry of ChinaFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Laboratory of Micro‑Nano Optoelectronic Materials and Devices Key Laboratory of Materials for High‑Power LaserState Key Laboratory of High Field Laser PhysicsShanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

Tungsten is an important material widely used not only in traditional refractory applications,but also in new functional *** in early 2019,Tungsten journal is dedicated to the science and technology of tungsten and re... 详细信息

关键词： alloys metals journal

On the Simulation of Industrial Gas Dynamic Applications with the Disconti- nuous Galerkin Spectral Element Method

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Journal of Thermal Science 2016年第3期25卷 250-257页

作者： F. Hempert M. Hoffmann u. Iben C.-D. Munz Robert-Bosch GmbH Robert-Bosch Campus 1 71272 Renningen Germany Institute of Aerodynamics and Gas Dynamics Pfaffenwaldring 21 70569 Stuttgart Germany

In the present investigation, we demonstrate the capabilities of the discontinuous Galerkin spectral element method for high order accuracy computation of gas dynamics. The internal flow field of a natural gas injector for bivalent combustion engines is investigated under its operating conditions. The simulations of the flow field and the aeroacoustic noise emissions were in a good agreement with the cxperirnental data. We tested several shockcapturing techniques for the discontinuous Galerkin scheme. Based on the validated framework, we analyzed the development of the supersonic jets during different opening procedures of a compressed natural gas injector. The results suggest that a more gradual injector opening decreases the noise emission.

关键词： Discontinuous Galerkin natural gas injection supersonic under-expanded jet high performance computing

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逆作法施工地下工程的结构设计方法

施工技术 2006年第7期35卷 39-41,61页

作者：吕金乐中国电子产业开发公司北京100846

为保证地下工程在逆作法施工中的安全性,除了正常的结构设计外,还需验算地下柱和首层梁、板在施工时的承载力,以及由于地下层楼板临时开洞,挡土支护的承载力。

关键词：逆作法施工荷载承载力

Fabrication of Superhydrophobic Micro Post Array on Aluminum Substrates using Mask Electrochemical Machining

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Chinese Journal of Mechanical Engineering 2018年第4期31卷 110-116页

作者： jing Sun Wei Cheng jin-Long Song Yao Lu Yan-Kui Sun Liu Huang Xin Liu Zhu-Ji jin Claire J-Carmalt Ivan P-Parkin Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education Dalian University of Technology Collaborative Innovation Center of Major Machine Manufacturing in Liaoning Dalian University of Technology Department of Chemistry University College London

Surfaces with controllable micro structures are significant in fundamental development of superhydrophobicity. However,preparation of superhydrophobic surfaces with array structures on metal substrates is not effective using existing methods. A new method was presented to fabricate super-hydrophobic post arrays on aluminum(Al) substrates using mask electrochemical machining and fluoridation. Electrochemical etching was first applied on Al plates with pre-prepared photoresist arrays to make the post array structures. Surface modification was subsequently applied to reduce the surface energy, followed by interaction with water to realize superhydrophobicity. Simulation and experimental verification were conducted to investigate how machining parameters affect the array structures. Analysis of the water contact angle was implemented to explore the relationship between wettability and micro *** results indicate that superhydrophobic surfaces with controllable post structures can be fabricated through this proposed method, producing surfaces with high water static contact angles.

关键词： Superhydrophobicity Aluminum substrates Mask electrochemical machining Micro post arrays

Hydrocarbon accumulation principles in troughs within faulted depressions and their significance in exploration

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Petroleum Science 2011年第1期8卷 1-10页

作者： Zhao Xianzheng jin Fengming Wang Quan Lu Xuejun Huabei Oilfield Company PetroChinaHebei 062552China

Previously,troughs in continental faulted depressions were usually considered as a zone of hydrocarbon generation and expulsion rather than a zone for hydrocarbon *** they were confirmed to be the source kitchen,the possibility that they could constitute potential plays would be overlooked in the subsequent exploration *** on the hydrocarbon exploration practice of the Jizhong Depression and the Erlian Basin in the past several years,this paper discusses a new understanding that reservoir distribution is controlled by multiple factors and lithological accumulations are more likely to form in trough *** further documents the three main factors controlling the formation of large lithological hydrocarbon accumulations in trough *** paper also discusses the new concept that structural and lithological accumulations not only co-exist but also complement each *** propose that fan-delta fronts on inverted steep slopes in troughs,delta fronts and sublacustrine fans on gentle slopes,channel sands along toes of fault scarps are favorable locations for discovery of new oil *** application of this concept has led to the discovery of several hundreds of million tonnes of oil in place in trough areas in the Jizhong Depression and the Erlian Basin.

关键词： Sand distribution multiple controlling factors preferential hydrocarbon accumulation accumulation in troughs accumulation model exploration method

understanding the multidimensional poverty in South Asia

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Journal of Geographical Sciences 2022年第10期32卷 2053-2068页

作者： LI Yuheng jin Qihui LI Ao CAS Key Laboratory of Regional Sustainable Development Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China College of Economics and Management Xinjiang Agricultural UniversityUrumqi 830052China College of Tourism and urban-Rural Planning Chengdu University of TechnologyChengdu 610059China

Special attention needs to be paid to achieve the world’s poverty reduction goal by 2030 in less than ten-year *** paper aims to investigate the multidimensional poverty in South Asia in the period *** constructs the Multidimensional Poverty Index(MPI)by selecting ten indicators in the fields of health,education and living *** research results show that the MPI of South Asia decreases in the research *** people in South Asian countries are still facing several forms of deprivation while cooking fuel,sanitation,housing,nutrition and years of schooling are the main restrictive factors to poverty reduction in this ***,India and Bangladesh face the worst poverty situation in terms of health,education and living *** poverty alleviation and resilient poverty reduction are proposed in the paper to improve the poverty reduction efficiency and individual/regional capacity against risks to avoid returning to poverty.

关键词： multidimensional poverty resilient poverty reduction sustainable development goals South Asia

Effects of aspirin on fracture healing in OPF rats

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Asian Pacific Journal of Tropical Medicine 2014年第10期7卷 801-805页

作者： jin-Song Wei Rong Zeng Si-Yuan Chen Hao Lin Shao-Ke Wu.jin-Chang Zheng Department of Orthopaedics Guangdong Medical University Affiliated Hospital

Objective:To study the effect of aspirin on healing process of osteoporotic fracture(OPF)in ***:A total of 50 female Wistar rata aged 3 months were randomly divided into observation group and control group,castration method was adopted to establish the osteoporosis(OP)*** artificial preparing fractures on the midpoint of left femur,fixing gram needle *** modeling was *** lavage of 33 mg once a day was adoptde in observation group after modeling,same amount of normal saline was used in the control as *** eash group,selected 5 rats at the 2nd.4th,8th and 12th week after modeling to measure the bone mineral density(BMD)and histogical examination of the fracture callus,radiology observation was conducted at the 8th and 12th *** femur biomechanical measurement was taken at the 12th ***:BMD values of observation group at each time point were significantly higher than that of the control group after modeling(Pup was faster than that of observation group,with fuzzy fracture line in observation group and clear fracture line in observtion group;at the 12th week,fracture line disappeared in observation group,fracture line of the control group was fuzzy at the same time;three-point bending load of the left femur in observation group rats was significantly higher than that of control group after12 weeka(Pusions:Asporin can accelerate the healing of new callus in OPF rats,increase bone density and biomechanics strength,and promote fracture of osteporotic rats.

关键词： Aspirin Osteoporosis Fracture Healing

Growth Dynamics of the Middle Devonian Jukoupu Bioherm,Xinshao, Hunan

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Acta Geologica Sinica(English Edition) 1994年第1期68卷 95-106页

作者： Gong EnpuDepartment of Geology, Northeast u niversity, Shenyang, Liaonmg Department of Geology Northeast University Shenyang Liaoning

The growth process, palaeoecological features and the function of organisms in reef-building of the Jukoupu bioherm in Hunan are discussed in detail. The bioherm is divided into 10 microfacies. Organisms are very abundant in the reef. Thirty-two genera Belonging to 7 phyla have been recognized. They make up 5 communities composed mainly of stromatopoids, Corals and algae, each of which has its own salient ecological features. An analysis of all communities shows that the organic functions are very complex. The same organisms may possess diverse functions simultaneously as the reef growth enters the late stage. The growth process of the reef may involve five stages' (l)biostrome stage, (2) stabilization stage, (3) frame-type reef-building stage, (4) binding and covering-type reef-building stage, and (5) baffle- type reef -building stage.

关键词： Hunan Province Middle Devonian reef community structure community succession growth process of bioherm