检索结果-南通市图书馆

chinese chemical Letters 2008年第7期19卷 780-782页

作者： Surinder Berar Urmila Berar Satish c.Gupta ramesh c.kamboj Department of chemistry Kurukshetra UniversityKurukshetra 136119India

Photocyclisation of substituted （E）-3-hydroxy-2-（V-methyl-2＇-phenylvinyl）-4-oxo-4H-1-benzopyrans to yield linear novel tricyclic 9H-furo[3,2-b]chromen-9-ones and angular fused tetracyclic xanthenones is described.

关键词： 9H-Furo(3,2-b)chromen-9-one Photocyclisation Xanthenones

Photochemical Transformations of Some 2-（5-Methylthiophen-2-yl）-3-[（naphthalen-2-yl）methoxy]-4H-chromen-4-ones Involving Type-II Process

在线全文

学校读者我要写书评

暂无评论

chinese Journal of chemistry 2011年第4期29卷 745-750页

作者： kamboj, ramesh c Kumar, Dinesh Sharma, Geeta Arora, Rita Department of chemistry Kurukshetra University Kurukshetra 136119 India

Photo-irradiation of 2-（5-methylthiophen-2-yl）-3-[（naphthalen-2-yl）methoxy]-4H-chromen-4-ones yielded the fascinating angular tetracyclic products via cyclization involving both 2-thienyl ring and naphthylmethoxy group via 1,4-biradical generated in the Norrish type-II process. The stereochemical dispositions of the products were determined by MM2 energy minimized programme and spectroscopic analysis.

关键词： type-II reaction radicals thienylchromone sigmatropic rearrangement substituent effects

Influence of B4c and ZrB2 reinforcements on microstructural,mechanical and wear behaviour of AA 2014 aluminium matrix hybrid composites

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第10期40卷 242-254页

作者： ramesh Babu R Rajendran c Saiyathibrahim A Rajkumar Velu Department of Mechanical Engineering Karpagam Institute of TechnologyCoimbatore 641105India Department of Mechanical Engineering Sri Krishna College of Engineering and TechnologyCoimbatore 641008India Department of Mechanical Engineering Indian Institute of Technology JammuJammu and Kashmir 181221India

considering their affordability and high strength-to-weight ratio,lightweight aluminium alloys are the subject of intensive research aimed at improving their properties for use in the aerospace *** research effort aims to develop novel hybrid composites based on AA 2014 alloy through the use of liquid metallurgy stir casting to reinforce dual ceramic particles of Zirconium Diboride(ZrB_(2))and Boron carbide(B4c).The weight percentage(wt%)of ZrB_(2) was varied(0,5,10,and 15),while a constant 5 wt%of B4c was maintained during this *** as-cast samples have been assessed using an Optical Microscope(OM)and a Scanning Electron Microscope(SEM)with Energy Dispersive Spectroscopy(EDS).The properties such as hardness,tensile strength,and wear characteristics of stir cast specimens were assessed to examine the impact of varying weight percentages of reinforcements in AA 2014 *** particular,dry sliding wear behaviour was evaluated considering varied loads using a pin-on-disc *** the weight%of ZrB_(2) grew and B4c was incorporated,hybrid composites showed higher hardness,tensile strength,and wear ***,the incorporation of a cumulative reinforcement consisting of 15 wt%ZrB_(2) and 5 wt%B4c resulted in a significant 31.86%increase in hardness and a 44.1%increase in tensile strength compared to AA 2014 *** addition,it has been detected that wear resistance of hybrid composite pin(containing 20 wt%cumulative reinforcement)is higher than that of other stir cast wear test pins during the whole range of applied *** surfaces of tensile specimens showed ductile fracture in the AA 2014 matrix and mixed mode for hybrid *** surfaces obtained employing higher applied load indicated abrasive wear with little plastic deformation for hybrid composites and dominant adhesive wear for matrix ***,the superior mechanical and tribological performance of hybrid composites can be attributed to dual reinforcement pa

关键词： AA 2014 alloy Stir casting Hybrid composite Hardness Tensile strength Specific wear rate

A novel mathematical morphology based algorithm for shoreline extraction from satellite images

在线全文

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2017年第4期20卷 345-352页

作者： c.A.Rishikeshan H.ramesh National Institute of Technology Karnataka Surathkal India

Shoreline extraction is fundamental and inevitable for several *** the precise spatial location of the shoreline is ***,the need for using remote sensing data to accomplish the complex task of automatic extraction of features,such as shoreline,has considerably *** feature extraction can drastically minimize the time and cost of data acquisition and database *** and fast approaches are essential to monitor coastline retreat and update shoreline ***,we present a flexible mathematical morphology-driven approach for shoreline extraction algorithm from satellite *** salient features of this work are the preservation of actual size and shape of the shorelines,run-time structuring element definition,semi-automation,faster processing,and single band *** proposed approach is tested with various sensor-driven images with low to high *** of the developed methodology has been assessed with manually prepared ground truths of the study area and compared with an existing shoreline classification *** proposed approach is found successful in shoreline extraction from the wide variety of satellite images based on the results drawn from visual and quantitative assessments.

关键词： Feature extraction shoreline detection satellite image processing remote sensing mathematical morphology

An overview of deep eutectic solvents:Alternative for organic electrolytes,aqueous systems&ionic liquids for electrochemical energy storage

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 Energy chemistry 2023年第7期82卷 592-626,I0013页

作者： Akshay Sharma Renuka Sharma ramesh c.Thakur Lakhveer Singh Department of chemistry Himachal Pradesh UniversitySummer HillShimla171005Himachal PradeshIndia Department of chemistry Sardar Patel UniversityMandi175001Himachal PradeshIndia

As the demand for sustainable energy sources continues to rise,the need for efficient and reliable energy storage systems becomes *** order to effectively store and distribute renewable energy,new and innovative solutions must be *** review examines the deep eutectic solvents(DESs)as a green,safe,and affordable solution for the electrochemical energy storage and conversion field,offering tremendous opportunities and a promising *** are a class of environment-friendly solvents known for their low toxicity and unique properties,such as their good conductivity,high thermal stability,and *** review explores the fundamentals,preparations,and various interactions that often predominate in the formation of DESs,the properties of DESs,and how DESs are better than traditional solvents involving cost-ineffective and unsafe organic electrolytes and ionic liquids as well as inefficient aqueous systems due to low energy density for electrochemical energy storage ***,a particular focus is placed on the various electrochemical applications of DESs,including their role in the electrolytes in batteries/supercapacitors,electropolishing and electrodeposition of metals,synthesis of electrode materials,recycling of electrodes,and their potential for use in cO_(2)*** review concludes by exploring the challenges,research gaps,and future potential of DESs in electrochemical applications,providing a comprehensive overview,and highlighting key considerations for their design and use.

关键词： Deep eutectic solvent Green solventHole theory Energy storage devices Aqueous electrolyte

Private Sector Participation in Electricity Generation and Distribution

在线全文

学校读者我要写书评

暂无评论

Small Hydro Power News 2005年第82期22卷 14-21页

作者： ramesh c Arya South Asia Watch on Trade Economics and Environment （SAWTEE） PO Box 4360 Kathmandu Nepal

In terms of hydropower resources in the country, Nepal ranks second in the world. But it has not acted seriously in terms of utilization. The effort began from the Rana days when they ruled the country for more than century. For energy, unfortunately, the country has at times sought thermal source rather than *** energy needs, it first depended upon foreign aid in the earlier dates. As late as in the ＇60s, it depended upon such assistance rather than developing its own. So much so, that it imported electrical power from neighbouring country. Later, it was developed both under foreign aid as well the multilateral assistance and loan. The electricity generation gradually became more and more costly. Only later, genuine private sectors have joined the energy market. But the terms and conditions have not always been in the national interest. There is a wide variation in cost of energy under different conditions of power development in the country, from the cheapest to the costliest. Both for generation and distribution, Nepal Electric corporation should no longer continue its *** sector should be promoted given more role to play for economy and *** paper discusses the different options available and practised in Nepal.

关键词：水电站电力需求水能河流水力发电尼泊尔

Maximum Power Enhancement Under Partial Shadings Using a Modified Sudoku Reconfiguration

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

cSEE Journal of Power and Energy Systems 2021年第6期7卷 1187-1201页

作者： Kandipati Rajani Tejavathu ramesh the Electrical Engineering Department National Institute of Technology Andhra PradeshWest Godavari-534101India

Partial shading is one of the important factors in reducing maximum power generation from PV(Photovoltaic)*** power generation can be improved by selecting a PV array through a Total-cross-Tied(T-c-T)***,maximum power generated from T-c-T can still be improved by distribution of shading over various *** to distribution of shading,the current entering the node increases and results in improved maximum power *** can be done effectively by using Sudoku reconfiguration *** techniques are economical,since they don’t require any sensors and switching *** technique only changes the physical location of the PV panel but the electrical connection between the panels remains the *** paper proposes a Modified Sudoku reconfiguration pattern which enhances the maximum power from the T-c-T connected PV ***,the theoretical calculation of row current and power output have been done for existing and proposed topologies under various shading *** performance of the proposed pattern has been analyzed and compared using specifications,such as Global Maximum Power(GMP),Fill Factor(FF),mismatch losses,and *** the results,it can be concluded that the Modified Sudoku reconfiguration enhances the GMP under all shading conditions.

关键词： Efficiency fill factor global maximum power point mismatch losses partial shadings PV array reconfiguration shading patterns sudoku and total-cross-tied

Why is graphene an extraordinary material? A review based on a decade of research

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2022年第2期16卷 1-39页

作者： Sachin Sharma Ashok KUMAR Shahid BASHIR Kasi ramesh Subramaniam ramesh centre for Ionics University of Malaya Department of PhysicsFaculty of ScienceUniversiti MalayaKuala Lumpur 50603Malaysia Higher Institution centre of Excellence(HIcoE) UM Power Energy Dedicated Advanced Centre(UMPEDAC)Level 4Wisma R&DUniversiti MalayaJalan Pantai BaharuKuala Lumpur 59990Malaysia

During this decade,graphene which is a thin layer of carbon material along at ease with synthesis and functionalization has become a hot topic of research owing to excellent mechanical strength,very good current density,high thermal conductivity,superior electrical conductivity,large surface area,and good electron *** research on graphene has exponentially accelerated specially when Geim and Novoselov developed and analyzed *** this basis,for industrial application,researchers are exploring different techniques to produce high-quality ***,reviewed in this article is a brief introduction to graphene and its derivatives along with some of the methods developed to synthesize graphene and its prospective applications in both research and *** this work,recent advances on applications of graphene in various fields such as sensors,energy storage,energy harvesting,high-speed optoelectronics,supercapacitors,touch-based flexible screens,and organic light emitting diode displays have been summarized.

关键词： graphene graphene oxide electrochemical sensor fuel cell supercapacitor dye-sensitized fuel cell lithium battery energy storage

A Novel Triple-tied-cross-linked PV Array configuration with Reduced Number of cross-ties to Extract Maximum Power Under Partial Shading conditions

在线全文

学校读者我要写书评

暂无评论

cSEE Journal of Power and Energy Systems 2021年第3期7卷 567-581页

作者： Tejavathu ramesh Kandipati Rajani Anup Kumar Panda Department of Electrical Engineering National Institute of Technology RourkelaIndia Department of Electrical and Electronics Engineering National Institute of Technology Andhra PradeshIndia

Partial shadings cause output power reduction from Photovoltaic(PV)arrays due to mismatch *** selection of PV array configurations play a vital role in maximum power *** paper proposes a novel Triple-Tied-cross-Linked(T-T-c-L)configuration to extract maximum power with a lesser number of cross ties than a Total-cross-Tied(T-c-T)*** performance of the proposed T-T-c-L configuration has been compared with various conventional PV array configurations,such as Series(S),Parallel(P),Series-Parallel(S-P),Bridge-Link(B-L),Honey-comb(H-c),and T-c-T under Partial Shading conditions(PScs)by considering the 9×9 PV *** PScs considered are uneven row,column,diagonal,random,short&narrow,short&wide,long&narrow,long&wide shadings and uniform half module *** measures,such as open circuit voltage,short circuit current,maximum power,voltages and currents at maximum power,mismatch losses,fill factor and efficiency have been used for performance analysis of various *** the results,it can be concluded that the performance of the proposed T-T-c-L configuration is optimal compared to other configurations.

关键词： Efficiency fill factor maximum power point mismatch losses partial shading conditions PV array configurations triple-tied-cross-linked

Synthesis, characterization and biocompatibility studies of zinc oxide(ZnO) nanorods for biomedical application

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2010年第1期2卷 31-36页

作者： R.Gopikrishnan K.Zhang P.Ravichandran S.Baluchamy V.ramesh S.Biradar P.ramesh J.Pradhan J.c.Hall A.K.Pradhan G.T.ramesh Molecular Toxicology Laboratory Center for Biotechnology and Biomedical Sciences Norfolk State University center for Materials Research Norfolk State University Health Science Academy Bayside High School Virginia Beach

Nanoparticles are increasingly being recognized for their potential utility in biological applications including ***,we have synthesized zinc oxide(ZnO)nanorods using zinc acetate and hexamethylenetetramine as precursors followed by characterizing using X-ray diffraction,fourier transform infrared spectroscopy,scanning electron microscopy and transmission electron *** growth of synthesized zinc oxide nanorods was found to be very close to its hexagonal nature,which is confirmed by X-ray *** nanorod was grown perpendicular to the long-axis and grew along the[001]direction,which is the nature of ZnO *** morphology of synthesized ZnO nanorods from the individual crystalline nucleus was confirmed by scanning and transmission electron *** length of the nanorod was estimated to be around 21 nm in diameter and 50 nm in *** toxicology studies showed that synthesized ZnO nanorods exposure on hela cells has no significant induction of oxidative stress or cell death even in higher concentration(10μg/ml).The results suggest that ZnO nanorods might be a safer nanomaterial for biological applications.

关键词： Zinc oxide [ZnO] Nanorods XRD SEM & TEM cytotoxicity