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Effect of induced magnetic field on natural convection in vertical concentric annuli

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Acta Mechanica Sinica 2012年第2期28卷 315-323页

作者： R.k.Singh A.k.Singh Department of Mathematics Central University of BiharPatnaIndia Department of Mathematics Banaras Hindu UniversityVaranasiIndia

In the present paper, we have considered the steady fully developed laminar natural convective flow in open ended vertical concentric annuli in the presence of a ra- dial magnetic field. The induced magnetic field produced by the motion of an electrically conducting fluid is taken into account. The transport equations concerned with the con- sidered model are first recast in the non-dimensional form and then unified analytical solutions for the velocity, induced magnetic field and temperature field are obtained for the cases of isothermal and constant heat flux on the inner cylin- der of concentric annuli. The effects of the various phys- ical parameters appearing into the model are demonstrated through graphs and tables. It is found that the magnitude of maximum value of the fluid velocity as well as induced magnetic field is greater in the case of isothermal condition compared with the constant heat flux case when the gap be- tween the cylinders is less or equal to 1.70 times the radius of inner cylinder, while reverse trend occurs when the gap between the cylinders is greater than 1.71 times the radius of inner cylinder. These fields are almost the same when the gap between the cylinders is equal to 1.71 times the radius of inner cylinder for both the cases. It is also found that as the Hartmann number increases, there is a flattening ten- dency for both the velocity and the induced magnetic field. The influence of the induced magnetic field is to increase the velocity profiles.

关键词： Natural convection Isothermal Heat flux Skin-friction Induced magnetic field Magnetohydrody- namics

Enhancement of Natural Circulation Type Domestic Solar Hot Water System Performance by using a Wind Turbine

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Journal of Thermal Science 2011年第4期20卷 371-376页

作者： k.k.Ramasamy PSS.Srinivasan Department of Mechanical Engineering Paavai Engineering CollegeNamakkal-637018TNIndia Department of Mechanical Engineering Knowledge Institute of TechnologySalem-637504TNIndia

Performance improvement of existing 200 litres capacity natural convection type domestic solar hot water system is attempted.A two-stage centrifugal pump driven by a vertical axis windmill having Savonius type rotor is added to the fluid *** windmill driven pump circulates the water through the *** system with necessary instrumentation is tested over a *** on Natural Circulation System(NCS)mode and Wind Assisted System(WAS)mode are carried out during January,April,July and October,*** results of a clear day are *** average efficiency of 25-28% during NCS mode and 33-37% during WAS mode are *** higher wind velocities,higher collector flow rates and hence higher efficiencies are *** general,WAS mode provides improvements in efficiency when compared to NCS mode.

关键词： Solar hot water system efficiency improvement windmill driven pump

MINIMAX PROGRAMMING UNDER GENERALIZED （p, r）-INVEXITY

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Journal of Systems Science & Complexity 2007年第4期20卷 501-508页

作者： S. k. MISHRA Shouyang WANG k. k. LAI Department of Mathematics Statistics and Computer Science College of Basic Sciences and Humanities G. B. Pant University of Agriculture and Technology Pantnagar-263 145 India Institute of Systems Science Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 China Department of Management Sciences City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong China

Minimax programming problems involving generalized （p, r）-invex functions are consid- ered. Parametric sufficient optimality conditions and duality results are established under the aforesaid assumptions on the obje... 详细信息

关键词： Duality minimax programming optimality conditions (p r)-invex functions.

ROLE OF α-PSEUDO-UNIVEX FUNCTIONS IN VECTOR VARIATIONAL-LIkE INEQUALITY PROBLEMS

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Journal of Systems Science & Complexity 2007年第3期20卷 344-349页

作者： S. k. MISHRA Shouyang WANG k. k. LAI Department of Mathematics Statistics and Computer Science College of Basic Sciences and Humanities G. B. Pant University of Agriculture and Technology Pantnagar-263 145 India. Institute of Systems Science Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 China. Department of Management Sciences City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong China.

In this paper, we introduce a new class of generalized convex function, namely, a-pseudounivex function, by combining the concepts of pseudo-univex and α-invex functions. Further, we establish some relationships between vector variational-like inequality problems and vector optimization problems under the assumptions of α-pseudo-univex functions. Results obtained in this paper present a refinement and improvement of previously known results.

关键词： α-pseudo-univex functions vector optimization vector variational-like inequality problems.

Biofuel-driven trigeneration systems for non-residential building applications:A holistic assessment from the energy,environmental and economic perspectives

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Building Simulation 2023年第4期16卷 557-576页

作者： k.F.Fong C.k.Lee Division of Building Science and Technology College of EngineeringCity University of Hong KongTat Chee AvenueKowloonHong KongChina

In the metropolises,it is unlikely to use merely solar and wind energy to pursue zero carbon building ***,it would become possible if biofuel-driven trigeneration systems(BDTS)are *** is thus essential to assess the application opportunity of BDTS in a holistic *** this study,BDTS offered definite primary energy saving of up to 15%and carbon emissions reduction of at least 86%in different types of non-residential buildings as compared to the conventional *** 24/7 operation for the hotel and hospital buildings,the corresponding BDTS could even achieve zero carbon *** the BDTS primed with compression-ignition internal combustion engine were not economically viable even in running cost due to the high local biodiesel price *** BDTS primed with spark-ignition engine and fueled by biogas,however,would have economic merit when carbon price was considered for the conventional systems that fully utilize fossil *** of carbon tax and social cost could have the payback ceilings of 8 years and 2 years respectively for most of building ***,the results could reflect the application potential of BDTS for non-residential buildings,leading the pathway to carbon neutrality for sustainable sub-tropical cities.

关键词： trigeneration biofuel dynamic simulation carbon tax social cost economic analysis

Modified Classical Over Barrier Model for Multi-Charged Ion in Collisions with Multiple Electron Target at Energies Below 1 keV/u

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Plasma Science and Technology 2010年第3期12卷 369-371页

作者： k.ISHII k.OkUNO Department of Physics Nara Women's University Kitauoyanishi

Charge transfer cross sections for kr^q＋ with Ne are calculated quantitatively by using modified classical over barrier model in order to clarify energy dependence of charge transfer cross sections in low energy region. Essential of this model is taking the induced dipole potential into consideration. As a result, this calculation can reproduce systematic energy dependence of experimental results. This suggests that the bending trajectory of the projectile due to an induced dipole potential should be considered to describe pictures of collisions at low energy regime below 1 keV/u.

关键词： atomic processes highly charged ion charge transfer classical over barrier

Robotic approach with neoadjuvant chemotherapy in adult Wilms’ tumor: A feasibility study report and a systematic review of the literature

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Asian Journal of Urology 2023年第2期10卷 128-136页

作者： Simone Sforza Valeria Emma palmieri Maria Rosaria Raspollini Giandomenico Roviello Alberto Mantovani Umberto Basso Maria Carmen Affinita Alberto D’Angelo Lorenzo Antonuzzo Marco Carini Andrea Minervini Lorenzo Masieri Department of Oncologic Minimally-Invasive Urology and AndrologyCareggi HospitalUniversity of FlorenceFlorenceItaly Department of Pediatric Urology Meyer Children HospitalUniversity of FlorenceFlorenceItaly Clinical Oncologic Unit Careggi HospitalUniversity of FlorenceFlorenceItaly Histopathology and Molecular Diagnostics Careggi HospitalUniversity of FlorenceFlorenceItaly Medical Oncology Unit 1 Istituto Oncologico Veneto IOV IRCCSPaduaItaly Hematology Oncology Division Department of Women’s and Children’s HealthPadova University HospitalPaduaItaly Department of Biology and Biochemistry University of BathBathUK

Objective:The incidence of Wilms’tumor(WT)among adult individuals accounts for less than 1%of kidney cancer cases,with a prognosis usually less favorable when compared to younger individuals and an overall survival rate of 70%for the adult patients versus 90%for the pediatric *** diagnosis and treatment of WT are complex in the preoperative setting;neoadjuvant chemotherapy(NAC)or robotic surgery has rarely been *** study aimed to review the literature of robotic surgery in WT and report the first adult WT management using both NAC and robotic ***:We reported a case of WT managed in a multidisciplinary ***,according to Preferred Reporting Items for Systematic reviews and Meta-Analyses recommendations,a systematic review of the literature until August 2020 of WT treated with a robotic approach was carried ***:A 33-year-old female had a diagnosis of *** was scheduled to NAC,and according to the clinical and radiological response to a robotic radical nephrectomy with aortic lymph nodes dissection,she was managed with no intraoperative rupture,a favorable surgical outcome,and a follow-up of 25 months,which did not show any *** systematic review identified a total number of 230 cases of minimally invasive surgery reported in the literature for *** these,approximately 15 patients were carried out using robotic surgery in adolescents while none in ***,NAC has not been administered before minimally invasive surgery in adults up until ***:WT is a rare condition in adults with only a few cases treated with either NAC or minimally invasive approach so *** advantage of NAC followed by the robotic approach could lead to favorable outcomes in this complex ***,additional cases of adult WT need to be identified and investigated to improve the oncological outcome.

关键词： Nephroblastoma Nephrectomy Renal neoplasm Minimally invasive surgery Rare tumor

Magnetotelluric Constraints on the Occurrence of Lower Crustal Earthquakes in the Intra-plate Setting of Central Indian Tectonic Zone

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Acta Geologica Sinica(English Edition) 2016年第3期90卷 884-899页

作者： k.k.ABDUL AZEEZ CSIR-National Geophysical Research Institute Uppal Road Hyderabad 500007 India

Lower crustal earthquake occurrence in the Central Indian Tectonic Zone （CITZ） of the Indian sub-continent was investigated using magnetotelluric （MT） data. MT models across the CITZ, including the new resistivity model across the 1938 Satpura lower crustal earthquake epicenter, show low resistive （〈80 Ωm） mid-lower crust and infer small volume （〈1 vol%） of aqueous fluids existing in most part of lower crust. This in conjunction with xenoliths and other geophysical data supports a predominant brittle/semi-brittle lower crustal theology. However, the local deep crustal zones with higher fluid content of 2.2%-6.5% which have been mapped imply high pore pressure conditions. The observation above and the significant strain rate in the region provide favorable conditions （strong/ moderate rock strength, moderate temperature, high pore pressure and high strain rate） for brittle failure in the lower crust. It can be inferred that the fluid-rich pockets in the mid-lower crust might have catalyzed earthquake generation by acting as the source of local stress （fluid pressure）, which together with the regional stress produced critical seismogenic stress conditions. Alternatively, fluids reduce the shear strength of the rocks to favor tectonic stress concentration that can be transferred to seismogenic faults to trigger earthquakes.

关键词： Resistivity fluids lower crustal earthquake intra-plate Central Indian Tectonic Zone

Magnesium matrix composite reinforced by nanoparticles-A review

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Journal of Magnesium and Alloys 2021年第1期9卷 57-77页

作者： k.B.Nie X.J.Wang k.k.Deng X.S.Hu k.Wu State key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

Significant progress has been made in magnesium-based composites during recent decades,especially for the appearance of magnesium matrix composite reinforced by *** nanoparticles added not only exhibit a good strengthening effect,but also maintain the initial toughness of the matrix,effectively balancing the contradiction between the strength and plasticity in the traditional magnesium matrix *** magnesium matrix nanocomposites with excellent mechanical properties have pushed the development of magnesium matrix composites to a new ***,it is very difficult to disperse the nanoparticles in metal melt especially in magnesium melt which is different from other metal melts and dangerous during the cast *** means that the preparation of magnesium matrix nanocomposite is extremely ***,the magnesium matrix nanocomposites possess a distinctive characteristic in deformation behavior,strengthening and toughening mechanism due to their special size effect of ***,this review will focus on the new preparation technologies,deformation behavior,mechanical properties and strengthening and toughening *** potential applications,development trends and future research ideas of magnesium matrix nanocomposite are also prospected.©2020 Published by Elsevier *** behalf of Chongqing University.

关键词： Magnesium matrix nanocomposite Microstructure Mechanical properties Strengthening mechanism