检索结果-南通市图书馆

Least Square Finite Element Method for Viscous Splitting of Unsteady Incompressible Navier–Stokes Equations

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2018年第4期32卷 490-500页

作者： shui qing-xiang WANG Da-guo HE Zhi-liang HUANG Jin School of Human Settlement and Civil Engineering Xi'an Jiaotong University School of Environmental and Resources Southwest University of Science and Technology

In order to solve unsteady incompressible Navier–Stokes(N–S) equations, a new stabilized finite element method,called the viscous-splitting least square FEM, is proposed. In the model, the N–S equations are split into diffusive and convective parts in each time step. The diffusive part is discretized by the backward difference method in time and discretized by the standard Galerkin method in space. The convective part is a first-order nonlinear *** the linearization of the nonlinear part by Newton’s method, the convective part is also discretized by the backward difference method in time and discretized by least square scheme in space. C0-type element can be used for interpolation of the velocity and pressure in the present model. Driven cavity flow and flow past a circular cylinder are conducted to validate the present model. Numerical results agree with previous numerical results, and the model has high accuracy and can be used to simulate problems with complex geometry.

关键词： unsteady incompressible N–S equations viscous splitting Newton's method least square finite element method driven cavity flow flow past a circular cylinder

Preparation of cauliflower-like bismuth sulfide and its application in electrochemical sensor

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第5期19卷 585-588页

作者： qing xiang Wang Feng Gao Shun Xing Li Wen Weng Zheng shui Hu Department of Chemistry Zhangzhou Normal University Zhangzhou 363000 China College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao 266042 China

A solvothermal process was developed for the preparation of cauliflower-like Bi2S3 from N,N-dimethylformamide （DMF） solution of bismuth nitrate [Bi（NO3）3.5H2O] and thioacetamide （TAA） with 2-undecyl-1-dithioureido-ethyl-imidazoline （SUDEI） as the morphology-controlling agent. The obtained Bi2S3 products were characterized by transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, and X-ray diffraction （XRD）, etc. The sensing properties of Bi2S3 with different morphologies were evaluated by the electrochemical analysis of dopamine （DA） and ascorbic acid （AA） coexisting solution. The results showed that cauliflower-like Bi2S3 showed a better resolving ability than rod-like Bi2S3 for the simultaneous determination of DA and AA,

关键词： Bismuth sulfide Solvothermal synthesis Electrochemical sensor

Two properties of sequence of vector measures on effect algebras

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2010年第4期25卷 475-480页

作者： LIN qing-shui LI Rong-lu Department of Mathematics Harbin Institute of Technology Harbin 150006 China

Let （L, ,0, 1） be an effect algebra and let X be a Banach space. A function ： L→ X is called a vector measure if μ（a b） =μ（a）＋ μ（b） whenever a⊥b in L. The function μ is said to be 8-bounded if limn→∞μ（an） = 0 in X for any orthogonal sequence （an）n∈N in L. In this paper, we introduce two properties of sequence of s-bounded vector measures and give some results on these properties.

关键词： Effect algebra s-bounded vector measure.

The Crystallization Behavior of L-Poly(lactic acid)/Polypropylene Blends:The Acceleration for Both L-Poly(lactic acid)and Polypropylene

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第6期42卷 775-786页

作者： Shuang-Cheng Li Wei-Jia Zhou Wen-Jie Wu Jun Shao shui-Liang Chen Hao-qing Hou Sheng xiang College of Chemistry&Chemical Engineering and Nanofiber Engineering Center of Jiangxi Province Jiangxi Normal UniversityNanchang330022China National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal UniversityNanchang330022China Wenzhou Institute University of Chinese Academy of SciencesWenzhou325001China

For a polymer/polymer dismissible blend with two crystallizable components,the crystallization behavior of different components and the reciprocal influences between different crystals are interesting and important,but did not investigate in *** this study,the L-poly(lactic acid)/polypropylene(PLLA/PP)blends with different weight ratios were prepared by melt mixing and the crystallization behavior of the blends were *** showed that the crystalline structures of PLLA and PP were not altered by the *** the crystallization of PLLA,both the diffusion of chain segments and crystallization rate were enhanced under the existence of PP *** the crystallization of PP,its crystallization rate was depressed under the existence of amorphous PLLA molecular *** the PP crystallized from the existence of PLLA crystals,although the diffusion rate of PP was reduced by PLLA crystals,the nucleation positions were obviously enhanced,which accelerated the formation of PP *** investigation would supply more basic data for the application of PLLA/PP blend.

关键词： L-poly(lactic acid) Polypropylene Blends Crystalization behavior Crystallization acceleration

A novel model for the proppant equilibrium height in hydraulic fractures for slickwater treatments

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2022年第1期19卷 254-263页

作者： Zhong-Wei Wu Chuan-Zhi Cui Yin-Zhu Ye xiang-Zhi Cheng Japan Trivedi shui-qing-Shan Lu Yin Qian College of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongChina Research Institute of Petroleum Exploration&Development PetroChinaBeijing100083China School of Mining and Petroleum Department of Civil and Environmental EngineeringUniversity of AlbertaEdmontonABT6G 2R3Canada

The proppant equilibrium height is the basis of investigating proppant distributions in artificial fractures and has a great significant influence on hydraulic fracturing *** are two shortcomings of current research on proppant equilibrium heights,one of which is that the effect of fracture widths is neglected when calculating the settling velocity and another of which is that the settling bed height is a constant when building the settling bed height growth rate *** fill those two shortcomings,this work provides a novel model for the proppant equilibrium height in hydraulic fractures for slickwater treatments.A comparison between the results obtained from the novel model and the published model and experimental results indicates that the proposed model is *** the sensitivity analysis,it is concluded that the proppant equilibrium height increases with an increasing proppant *** proppant equilibrium height decreases with an increase in the slickwater injection rate and increases with an increase in the proppant injection *** increase in proppant diameter results in an increasing the friction factor,which makes proppant equilibrium heights ***,the increase in proppant sizes results in an increase in proppant settling rates,which makes the proppant equilibrium height *** the effect of the proppant diameter on settling rates is more significant than that on friction factors,the equilibrium height increases with an increasing proppant *** work provides a research basis of proppant distributions during the hydraulic fracture.

关键词： Equilibrium height Proppant settling Fracture width Slickwater Shale and tight reservoirs

Green Tea Polyphenols Prevent Early Vascular Aging Induced by High-Fat Diet via Promoting Autophagy in Young Adult Rats

在线全文

学校读者我要写书评

暂无评论

Current Medical Science 2022年第5期42卷 981-990页

作者： xiang-tian XIAO shui-qing HE Nan-nan WU Xue-chun LIN Jing ZHAO Chong TIAN Medical College of Wuhan University of Science and Technology Wuhan430081China Department of Nutrition and Food Hygiene Hubei Key Laboratory of Food Nutrition and SafetySchool of Public HealthTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430030China School of Public Health and Management Research Center for Medicine and Social DevelopmentInnovation Center for Social Risk Governance in HealthChongqing Medical UniversityChongqing400016China School of Nursing Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan430030China

Objective Epidemiology studies indicate that green tea polyphenols(GTP)perform a protective effect on cardiovascular diseases,but the underlying mechanisms are *** present study aimed to investigate the effect of GTP on high-fat diets(HFD)induced-early vascular *** Six-week young adult Wistar rats were fed with standard chow or HFD in the presence and absence of GTP(200 mg/kg body weight)for 18 *** vitro experiment,human umbilical vascular endothelial cells(HUVECs)were treated with palmitic acid(PA)and *** The results showed that GTP alleviated the disorganized arterial wall and the increased intima-media thickness induced by *** addition,the vascular oxidative injury was suppressed following GTP ***,GTP elevated the ratio of LC3-II/LC3-I and suppressed expression of p62/SQSTM1,and restored SIRT3 expression in the aorta of HFD ***,in cultured HUVECs,GTP inhibited cell senescence indicated by SA-β-gal and promoted endothelial autophagy compared with the PA treatment *** activity of SIRT3 was specifically inhibited by 3-TYP,and the protective effect of GTP was consequently *** The findings indicated that GTP protected against early vascular senescence in young HFD rats via ameliorating oxidative injury and promoting autophagy which was partially regulated by the SIRT3 pathway.

关键词： high-fat diets green tea polyphenols early vascular aging autophagy Sirtuin 3

Effect of Nano-anatase TiO_2 on Spectral Characterization of PhotosystemⅡParticles from Spinach

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

Chemical Research in Chinese Universities 2005年第2期21卷 196-200页

作者： HONGFa-shui YANGPing GAOFeng-qing LIUChao ZHENGLei YANGFan ZHOUJuan CollegeofLifeSciences CollegeofChemistryandChemicalEngineering SuzhouUniversitySuzhou215006P.R.China

The photosystem Ⅱ(PSⅡ) particles were purified by means of nano-anatase TiO_2 treatment of spinach and studied by spectroscopy. The results show that the electron transport and the oxygen-evolving rate of PSⅡ are accelerated after it has been treated with nano-anatase TiO_2; the UV-Vis absorption spectrum of PSⅡ particles is increased; the red shift of fluorescence emission peak of PSⅡ is 2 nm; the peak intensity is decreased; the PSⅡ signal Ⅱs of low temperature electron paramagnetic resonanace(EPR) spectrum is intensified under light, and the PSⅡ circular dichroism(CD) spectrum is similar to that of control. It is suggested that nano-anatase TiO_2 might bind to the PSⅡ reaction center complex and intensify the function of the PSⅡ electron donor, however, nano-anatase TiO_2 treatment does not change the configuration of the PSⅡ reaction center complex.

关键词： Nano-anatase TiO_2 Spinach PhotosystemⅡ Spectral characterization

An efficient and coordinated mapping algorithm in virtualized SDN networks

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2016年第7期17卷 701-716页

作者： shui-qing GONG Jing CHEN Qiao-yan KANG qing-wei MENG qing-chao ZHU Si-yi ZHAO College of Information and Navigation Air Force Engineering University

Software-defined networking(SDN) enables the network virtualization through SDN hypervisors to share the underlying physical SDN network among multiple logically isolated virtual SDN networks(v SDNs),each with its own *** v SDN embedding,which refers to mapping a number of v SDNs to the same substrate SDN network,is a key problem in the SDN virtualization ***,due to the distinctions of the SDN,such as the logically centralized controller and different virtualization technologies,most of the existing embedding algorithms cannot be applied directly to SDN *** this paper,we consider controller placement and virtual network embedding as a joint vS DN embedding problem,and formulate it into an integer linear programming with objectives of minimizing the embedding cost and the controller-to-switch delay for each v ***,we propose a novel online vS DN embedding algorithm called CO-v SDNE,which consists of a node mapping stage and a link mapping *** the node mapping stage,CO-vS DNE maps the controller and the virtual nodes to the substrate nodes on the basis of the controller-to-switch delay and takes into account the subsequent link mapping at the same *** the link mapping stage,CO-v SDNE adopts the k-shortest path algorithm to map the virtual *** evaluation results with simulation and Mininet emulation show that the proposed CO-v SDNE not only significantly increases the long-term revenue to the cost ratio and acceptance ratio while guaranteeing low average and maximum controller-to-switch delay,but also achieves good v SDN performance in terms of end-to-end delay and throughput.

关键词： Software-defined networking(SDN) Network virtualization Controller placement Virtual network embedding Coordination

Thermally Stable Guest-Host Polyetherketone Poled Polymer for Electro-Optical Applications

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2002年第8期19卷 1125-1127页

作者： Pan Qi-Wei Fang Chang-shui Qin Zhi-Hui Gu qing-Tian Wu xiang-Wen Shi Wei Yu Jin-Zhong State Key Laboratory of Crystal Materials Shandong University Ji'nan 250100 State Key Laboratory on Integrated Optoelectronics of Semiconductor Chinese Academy of Sciences Beijing 100083

The high glass transition temperature polymer polyetherketone doped with disperse red 13 (DR13/PEK-c) has been prepared by the spin-coating method. Through in situ second-harmonic generation, the corona poling temperature was optimized by measuring the temperature dependence of the in situ second-harmonic generation signal intensity under the poling electric field. The linear electro-optic coefficients of the poled polymer films have been determined at 632.8nm by using a simple interferometric technique. The polymer system was measured after 13000h, and found that it remained at 80% of its initial value.

关键词： Harmonic generation