检索结果-南通市图书馆

NUMERICAL SIMULATION OF 3-D TURBULENT FLOW IN THE MULTI-INTAKES SUMP OF THE PUMP STATION

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 Hydrodynamics 2007年第1期19卷 42-47页

作者： CHEN Hong-xun shen Xin-rong Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China

In this article, a numerical model forthree-dimensional turbulent flow in the sump of the pumpstation was presented. A reasonable boundary condition for the flow in the sump with several water intakes at different flowrates was proposed. The finite volume method was employed tosolve the governing equations with the body fitted gridgenerated by the multi-block grid technique. By using theFluent software, the fluid flow in a model sump of the pumpstation was calculated. Compared with the experimental result,the numerical result of the example is fairly good.

关键词： pumping station sump suction pipe turbulentmodel numerical simulation

Spaces with σ-point-discrete N_0-weak bases

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2013年第1期28卷 116-126页

作者： shen rong-xin LIN Shou Department of Mathematics Taizhou Teachers' College Department of Mathematics Nanjing University Department of Mathematics Ningde Normal University

It is discussed in this paper the spaces with σ-point-discrete N_0-weak bases. The main results are：（1） A space X has a σ-compact-finite N_0-weak base if and only if X is a k-space with a σ-point-discrete N_0-weak base; （2） Under （CH）, every separable space with a σ-point-discrete N_0-weak base has a countable N_0-weak base.

关键词： N_0-weak base σ-point-discrete network σ-compact-finite network separable space.

Vibrating Carbon Nanotubes as Water Pumps

在线全文

学校读者我要写书评

暂无评论

Nano Research 2011年第3期4卷 284-289页

作者： Hu Qiu rong shen Wanlin Guo Institute of Nano Science Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

Nanopumps conducting fluids directionally through nanopores and nanochannels have attracted considerable interest for their potential applications in nanofiltration, water purification, and hydroelectric power generation Here, we demonstrate by molecular dynamics simulations that an excited vibrating carbon nanotube （CNT） cantilever can act as an efficient and simple nanopump. Water molecules inside the vibrating cantilever are driven by centrifugal forces and can undergo a continuous flow from the fixed to free ends of the CNT. Further extensive simulations show that the pumping function holds good not only for a single-file water chain in a narrow （6,6） CNT, but also for bulk-like water columns inside wider CNTs, and that the water flux increases monotonically with increasing diameter of the nanotube.

关键词： Nanopump carbon nanotube nanofluidics centrifugal forces water dynamics

Pre-bainitic Transformation in Fe-Ni Alloy

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 Iron and Steel Research International 1998年第2期5卷 49-51页

作者： shen rong Cheng Juqiang Kang Mokuang Northwestern Polytechnical University

The behaviour of the pre bainitic transformation in Fe Ni alloy was investigated by using SAM, X ray diffraction and TEM. The results show that there is segregation of Ni atoms in austenite and that bainite forms i... 详细信息

关键词： bainite pre bainitic transformation Fe Ni alloy

同方期刊数据库

Nucleation of Bainite around Grain Boundary

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1998年第4期14卷 383-384页

作者： shen, rong Cheng, Juqiang Wang, Liuding Kang, Mokuang Northwestern Polytech Univ Dept Mat Sci & Engn Xian 710072 Peoples R China

The scanning Auger microprobe study on Fe-8Mn-1C alloy shows that the carbon atoms segregate at grain boundary during bainitic transformation and solute atoms depleted regions form near the grain boundary. The observation of optical and TEM indicates that bainite nucleates in solute atoms depleted regions near the grain boundary. (Edited author abstract) 11 Refs.

关键词： Iron alloys

FLUID-STRUCTURE INTERACTION OF HYDRODYNAMIC DAMPER DURING THE RUSH INTO THE WATER CHANNEL

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2008年第5期20卷 583-590页

作者： XU Qing-xin shen rong-ying State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai 200240China

The hydrodynamic damper is a device to decrease the motion of armament carrier by use of the water resistance. When hydrodynamic damper rushes into the water channel with high velocity, it is a complicated flow phenomenon with fluid-structure interaction, free surface and moving interface. Numerical simulation using the Smoothed Particle Hydrodynamics （SPH） method coupled with the Finite Element （FE） method was successfully conducted to predict the dynamic characteristics of hydrodynamic damper. The water resistance, the pressure in the interface and the stress of structure were investigated, and the relationship among the peak of water resistance, initial velocity and actual draught was also discussed. The empirical formula was put forward to predict the water resistance. And it is found that the resistance coefficient is commonly in the range of 0.3 ≤ C ≤ 0.5, when the initial velocity is larger than 50 m/s. It can be seen that the SPH method coupled with the FE method has many obvious advantages over other numerical methods for this complicated flow problem with fluid-structure interaction.

关键词： hydrodynamic damper fluid-structure interaction Smoothed Particle Hydrodynamics (SPH) method Finite Element (FE) method

Rice Phospholipase Dαis Involved in Salt Tolerance by the Mediation of H^+-ATPase Activity and Transcription

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2011年第4期53卷 289-299页

作者： Peng shen rong Wang Wen Jing Wenhua Zhang College of Life Sciences State Key Laboratory of Crop Genetics and Germplasm Enhancement Nanjing Agricultural University Nanjing 210095 China

Phospholipase Dα（PLDα） is involved in plant response to salt stress,but the mechanisms remain unclear. We investigated rice PLDα（OsPLDa） localization and its effect on tonoplast（TP） and plasma membrane （PM） H^＋ -ATPase activity and transcription in response to *** rice suspension-cultured cells were treated with 100 mM NaCI,PLDa activity in cell extracts showed a transient activation with a threefold increase at 1 *** amount of OsPLDαprotein decreased slightly in the cytosolic fractions,whereas it increased significantly in the TP after NaCI ***α1 knockdown cells were developed using RNA interference（RNAi） *** increase in TP and PM H -ATPase activity induced by NaCI was significantly inhibited in OsPLDα1-RNAi *** of OsPLDα1 prevented the NaCI-induced increase in the transcript level of OsVHA-A（encodes TP H^＋-ATPase） and OSA2（encodes PM H^＋-ATPase）, as well as OsNHX1（encodes TP Na^＋ /H^＋ antiporter）.The cells died more in OsPLDα1-RNAi mutant than in wild type when they were treated with *** results suggest that OsPLDαis involved in salt tolerance in rice through the mediation of H^＋ -ATPase activity and transcription.

关键词： Rice Salts Brining Transcription ATPase Cells Lymphocytes

The electric field and frequency responses of giant electrorheological fluids

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第7期27卷 561-565页

作者： Hanqing Zhao rong shen Kunquan Lu School of Physics and Technology Wuhan UniversityWuhan 430072China Beijing National Laboratory for Condensed Matter Physics Key Laboratory of Soft Matter and Biological PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China

The giant electrorheological （ER） fluid is based on the principle of a polar molecule dominated electrorheological （PM-ER） effect. The response of the shear stress for PM-ER fluid in alternate electric fields with triangle/square wave forms for different frequencies has been studied. The results show that the shear stress cannot well follow the rapid change of electric field and the average shear stresses of PM-ER fluids decrease with the increasing frequency of the applied field due to the response decay of the shear stress on applied field. The behavior is quite different from that of traditional ER fluids. However, the average shear stress of PM-ER fluid in a square wave electric field of iE at low frequency can keep at high value. The obtained knowledge must be helpful for the design and operation of PM-ER fluids in the applications.

关键词： electrorheological fluid frequency response

Solitary rectal ulcer syndrome:Clinical features,pathophysiology,diagnosis and treatment strategies

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第3期20卷 738-744页

作者： Qing-Chao Zhu rong-rong shen Huan-Long Qin Yu Wang Department of Surgery The Sixth People's Hospital Affiliated to Shanghai Jiao Tong University Department of Surgery The Tenth People's Hospital Affiliated to Shanghai Tongji University

Solitary rectal ulcer syndrome (SRUS) is an uncommon benign disease, characterized by a combination of symptoms, clinical findings and histological abnormalities. Ulcers are only found in 40% of the patients; 20% of the patients have a solitary ulcer, and the rest of the lesions vary in shape and size, from hyperemic mucosa to broad-based polypoid. Men and women are affected equally, with a small predominance in women. SRUS has also been described in children and in the geriatric population. Clinical features include rectal bleeding, copious mucus discharge, prolonged excessive straining, perineal and abdominal pain, feeling of incomplete defecation, constipation, and rarely, rectal prolapse. This disease has well-described histopathological features such as obliteration of the lamina propria by fibrosis and smooth muscle fibers extending from a thickened muscularis mucosa to the lumen. Diffuse collage deposition in the lamina propria and abnormal smooth muscle fiber extensions are sensitive markers for differ-entiating SRUS from other conditions. However, the etiology remains obscure, and the condition is frequently associated with pelvic floor disorders. SRUS is difficult to treat, and various treatment strategies have been advocated, ranging from conservative management to a variety of surgical procedures. The aim of the present review is to summarize the clinical features, pathophysiology, diagnostic methods and treatment strategies associated with SRUS. (C) 2014 Baishideng Publishing Group Co., Limited. All rights reserved.

关键词： Solitary rectal ulcer syndrome Pathophysiology Diagnosis Treatment Clinical characteristics Treatment