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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

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

Optical recursional binormal optical visco Landau-Lifshitz electromagnetic optical density

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Communications in Theoretical Physics 2023年第5期75卷 17-37页

作者： Talat körpinar Zeliha körpinar Muş Alparslan University Department of Mathematics49250MuşTurkey Muş Alparslan University Department of Administration49250MuşTurkey

In this manuscript,we study a new version of the optical recursional binormal microbeam model for a flexible binormal microscale beam in terms of a binormal normalized ***,we give new explanations for the optical recursional visco Landau-Lifshitz binormal electromagnetic binormal microscale ***,we obtain an optical application for the normalized visco Landau-Lifshitz electromagnetic binormal optimistic density with an optical binormal resonator.

关键词： optical recursion optical visco Landau-Lifshitz microscale flexible elastic microscale electromagnetic optimistic density visco microbeam model

Comparative study on high temperature deformation behavior and processing maps of Mg-4Zn-1RE-0.5Zr alloy with and without in-situ sub-micron sized TiB2 reinforcement

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Journal of Magnesium and Alloys 2022年第12期10卷 3520-3541页

作者： S.k.Sahoo S.k.Panigrahi Department of Mechanical Engineering Indian Institute of Technology MadrasChennai-600036India Applied Magnesium Research Group Center of Excellence in Materials and Manufacturing for Futuristic Mobility Indian Institute of Technology MadrasChennai-600036India

Mg-4Zn-1RE-0.5Zr (ZE41) Mg alloy is extensively used in the aerospace and automobile *** order to improve the applicability and performance,this alloy was engineered with in-situ Ti B2reinforcement to form Ti B2/ZE41 *** high temperature deformation behavior and manufacturability of the newly developed Ti B2/ZE41 composite and the parent ZE41 Mg alloy were studied via establishing constitutive modeling of flow stress,deformation activation energy and processing map over a temperature range of 250℃-450℃ and strain rate range of 0.001 s-1-10 *** predicted flow stress behavior of both materials were found to be well consistent with the experimental values.A significant improvement in activation energy was found in Ti B2/ZE41 composite (171.54 k J/mol) as compared to the ZE41 alloy (148.15 k J/mol) due to the dispersed strengthening of in-situ Ti *** processing maps were developed via dynamic material modeling.A wider workability domain and higher peak efficiency (45%) were observed in Ti B2/ZE41 composite as compared to ZE41 alloy (41%).The Dynamic recrystallization is found to be the dominating deformation mechanism for both materials;however,particle stimulated nucleation was found to be an additional mode of deformation in Ti B2/ZE41 *** twinning and stress induced cracks were observed in both the materials at low temperature and high strain rate.A narrow range of instability zone is found in the present Ti B2/ZE41 composite among the existing published literature on Mg based *** detailed microstructural characterization was carried out in both workability and instability domains to establish the governing deformation mechanisms.

关键词： ZE41 Mg composite In-situ TiB2 particles ZE41 Mg alloy Constitutive equations Processing map Dynamic recrystallization