检索结果-南通市图书馆

Journal of Minerals and Materials characterization and Engineering 2012年第3期11卷 285-302页

作者： Dinesh Gond R.S. Lalbondre D. Puri S. prakash HEEP Bharat Heavy Electricals Ltd. (Government of India Undertaking) Haridwar India. Mechanical Engineering Department National Institute of Technology Suratkal India Metallurgical & Materials Engineering Department Indian Institute of Technology Roorkee India

Yttria-Stabilised Zirconia (YSZ) coatings were deposited on a T-91 boiler steel. NicrAlY was used as bond coat and YSZ as top coat. Hot corrosion studies were conducted on uncoated as well as plasma spray coated specimens in air as well as salt (75wt. % Na2SO4 + 25wt. % Nacl) at 900°c under cyclic conditions. The thermogravimetric technique was used to establish kinetics of corrosion. X-ray diffraction (XRD) and scanning electron microscopy/energy-dispersive x-ray analysis (SEM/EDAX) techniques were used to analyse the corrosion products. This YSZ overlay coatings enhance resistance to corrosion significantly which can be attributed to formation of zirconium oxides (ZrO2) and yttrium oxide (Y2O3). This coating was more effective in salt environment and there is an extra phase of ZrS.

关键词： Hot corrosion T-91 Plasma spray coating.

comparative Efficacy of Tagetes erectaand centella asiaticaExtracts on Wound Healing in Albino Rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

chinese Medicine 2011年第4期2卷 138-142页

作者： Sandipan chatterjee Tigari prakash Dupadahalli Kotrsha Nadendla Rama Rao Divakar Goli 不详

The study was undertaken to evaluate the comparative efficacy of hydroalcoholic extracts of leaves of Tagetes erecta (T. erecta) and aerial parts of centella asiatica (c. asiatica) on Excision, Incision and Dead space wound models in albino rats. Extract of T. erecta and c. asiatica (P T. erecta extract (250 and 500 mg/kg) showed significantly increased the wound breaking strength in incision wound model and wet and dry granulation tissue weights, breaking strength in a dead space wound model compare to control and c. asiatica treated group (P T. erecta extract showed potent wound healing activity then the reported c. asiatica in different wound parameters.

关键词： centella asiatica Tagetes erecta Excision Incision Dead Space Wound Model

Influence of Machining Parameter on Tool Life While Machining Hybrid Metal Matrix 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

Journal of Minerals and Materials characterization and Engineering 2020年第6期8卷 440-458页

作者： c. R. prakash Rao V. Ravi Kumar D. V. Ravi Kumar Poorna chandra M. Vedavyasa M. S. Rajagopal Department of Mechanical Engineering Global Academy of Technology Bengaluru India Department of Mechanical Engineering Dayananda Sagar University Bangalore India

A metal matrix composite constitutes a continuous metallic matrix and a discontinuous phase known as reinforcement. The hybrid metal matrix composites (Hmmcs) have been used to manufacture drive shafts, disc brake rotors, brake drums, connecting rods pistons, engine block cylinder liners for automotive and rail vehicle applications. The Hmmcs castings of diameter 120 mm and length 300 mm were prepared through sand mould technique following stir casting methodology. The cast components further subjected to evaluation of physical properties and machining tests using two grades of coated inserts and PCD inserts. The experiments were carried out following ISO 3685 standards. The coating thickness of the TiN coated and TiAlN coated inserts were measured using Kalo testing method; the results of the test show that the interface of the substrate and coating was free from the porosity, and the coating thickness of TiN coating was 4.84 microns and TiAlN coating was measured 4.6 microns. The results of the experiments show that performance of the PCD insert was better than coated inserts at 0.1 mm/rev feed; however at 0.2 mm/revolution feed PcD insert failed by micro chipping of cutting edge while ma

关键词： composites Hybrid Metal Matrix composites coated Inserts PcD Inserts Turning Tool Life Testing

comparative Analysis of Genetic Diversity among cultivated Pigeonpea (cajanus cajan(L) Millsp.) and Its Wild Relatives (c. albicansand c. lineatus) Using Randomly Amplified Polymorphic DNA (RAPD) and Inter Simple Sequence Repeat (ISSR) Fingerprinting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2014年第11期5卷 1665-1678页

作者： Kusum Yadav Sanjay Kumar Yadav Anurag Yadav Veda prakash Pandey Upendra Nath Dwivedi Department of Biochemistry University of Lucknow Lucknow India Department of Microbiology Sardarkrushinagar Dantiwada Agricultural University Palanpur India

Genetic relationships of 16 cultivars of pigeonpea (cajanus cajan (L) Millsp.) and its two wild relatives (c. albicans and c. lineatus) from different parts of the India were analysed using 22 random amplified polymorphic DNAs (RAPDs) primers and 10 inter simple sequence repeats (ISSRs) primers. Twenty two RAPD primers yielded 151 polymorphic markers (71.2%) with an average of 6.8 polymorphic band/primer. cluster analysis based on these 151 RAPD markers revealed relatively low level (0.434 - 0.714) of genetic diversity among cultivars and high level of diversity between cultivars and wild relatives. Ten ISSR primers produced 100 bands across 16 cultivars and its wild relatives out of which 93 (93%) were polymorphic with an average of 9.3 polymorphic band/primer. cluster analysis based on these 93 ISSR markers also revealed relatively higher level (0.328 - 0.827) of genetic diversity among cultivars as compared to RAPD markers. The polymorphic markers obtained by both RAPD and ISSR primers were pooled and the genetic diversity analysis based on these 244 markers was analysed. Jaccard’s similarity coefficient obtained by pooled data revealed very narrow range (0.477 - 0.720) among cultivated and high range between cultivated and wild species c. albicans (0.240 - 0.331) and c. lineatus (0.163 - 0.193). In the UPGMA based dendrogram the 16 cultivars were grouped into three distinct clusters. cluster I contained two genotypes, cluster II had six and cluster III had eight genotypes. Principal components analysis (PcA) also resulted in similar pattern as that of UPGMA based analysis. The first three Pcs contributed 56.26%, 5.71% and 4.97% of variation, respectively, with cumulative variation of the first three Pcs was 66.96%. Both the markers and the combined data revealed similar pattern with narrow diversity among cultivars and higher diversity between cultivars and wild one, but the genetic diversity range obtained by ISSR markers was relatively higher as compared to RA

关键词： Genetic Diversity RAPD ISSR Pigeonpea

Role of activation energies of individual phases in two-phase range on constitutive equation of Zr-2.5Nb-0.5cu alloy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of china 2017年第1期27卷 172-183页

作者： K.K.SAXENA S.K.jha V.PANcHOLI G.P.cHAUDHARI D.SRIVASTAVA G.K.DEY N.SAIBABA Department of Metallurgical and Materials Engineering Indian Institute of TechnologyRoorkee-247667UttarakhandIndia Nuclear Fuel complex Limited Hyderabad-501301India Materials Science Division Bhabha Atomic Research CenterMumbai-40085India Department of Mechanical Engineering Insitute of Engineering and TechnologyGLA UinversityMathura-281406Uttar PradeshIndia

Dominant phase during hot deformation in the two-phase region of Zr-2.5Nb-0.5cu （ZNc） alloy was studied using activation energy calculation of individual phases. Thermo-mechanical compression tests were performed on a two-phase ZNc alloy in the temperature range of 700-925 ℃ and strain rate range of 10-2-10 s-l, Flow stress data of the single phase were extrapolated in the two-phase range to calculate flow stress data of individual phases. Activation energies of individual phases were then calculated using calculated flow stress data in the two-phase range, comparison of activation energies revealed that a phase is the dominant phase （deformation controlling phase） in the two-phase range. constitutive equations were also developed on the basis of the deformation temperature range （or according to phases present） using a sine-hyperbolic type constitutive equation. The statistical analysis revealed that the constitutive equation developed for a particular phase showed good agreement with the experimental results in terms of correlation coefficient （R） and average absolute relative error （AARE）.

关键词： Zr-2.5Nb-0.5cu alloy hot deformation activation energy constitutive equation two-phase material

维普期刊数据库

Genetic Diversity of Pigeonpea (cajanus cajan(L.) Millsp.) cultivars and Its Wild Relatives Using Randomly Amplified Polymorphic DNA (RAPD) Markers

在线全文

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2012年第3期3卷 322-330页

作者： Kusum Yadav Sanjay Kumar Yadav Anurag Yadav Veda prakash Pandey Upendra Nath Dwivedi Department of Biochemistry University of Lucknow Lucknow India Department of Microbiology College of Basic Science & Humanities Sardarkrushinagar Dantiwada Agricultural University Palanpur India

Genetic diversity among and between 16 cultivars of pigeonpea (cajanus cajan (L) Millsp.) and its wild relatives (c. albicans and c. lineatus) analysed using RAPD. Twenty two random primers with an average of 71.2% polymorphism produced 151 polymorphic bands. cluster analysis based on these 151 RAPD markers revealed relatively low level (0.434 - 0.714) of genetic diversity among cultivars and high level of diversity between cultivars and wild relatives. c. albicans and c. lineatus showed only 0.231 similarity with each other and c. albicans showed relatively higher similarity with c. cajan cultivars than that showed by c. lineatus. In dendrogram the 16 cultivars grouped into two distinct clusters comprising of seven and nine genotypes each while the wild species form out groups. Bootstrap analysis of the dendrogram was performed and resulted in significant bootstrap values. Principal components analysis (PcA) also revealed the similar results that of unweighted pair group method with arithmetic mean (UPGMA). The first, second and third Pcs contributed 55.9%, 5.9%, and 5.6% of the variation, respectively, with cumulative variation of the first three Pcs was 67.4%.

关键词： Genetic Diversity RAPD Pigeonpea

Performance of Nanostructured Metal Nitride coated T-22 Boiler Steel in Na2SO4–60% V2O5Environment at 900°c under cyclic conditions

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 Minerals and Materials characterization and Engineering 2011年第7期10卷 583-608页

作者： Vikas chawla Amita chawla D. Puri S. prakash Buta Singh Sidhu chemistry Department Govt. Brijindra College Faridkot-151203 India Dean (Academics) P.T.U. Jalandhar-144001 India Mechanical Engineering Department F.C.E.T. Ferozepur-152002 India Metallurgical & Materials Engineering Department I.I.T. Roorkee -247667 India

In this work, TiAlN and AlcrN coatings were deposited on ASTM-SA213-T-22 boiler steel using Balzer’s rapid coating system (RcS) machine (make Oerlikon Balzers, Swiss) under a reactive nitrogen atmosphere. cyclic oxidation studies in molten salt environment were conducted at 900°c temperature in the laboratory using silicon carbide furnace. The weight gain was measured after each cycle and visually examined the surface morphology of the oxidized samples was studied using FE-SEM with EDAX attachment and XRD analysis. The results obtained showed the better performance of TiAlN coated T-22 boiler steels than the AlcrN coated and uncoated T-22 boiler steel.

关键词： Nanostructured coating Hot corrosion Oxide Scale Physical vapour deposition Scale morphology.

水稻叶绿素诱发突变与某些生化变化和长蠕孢菌发生率关系的研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

原子能农业译丛 1983年第1期 30-32页

作者： S.c.Mathur J.prakash 董以德

叶绿素突变体的重要性,体现在细胞器能量转换效应,包括整个酶的过程和光合作用所必需的成份如DNA、RNA以及DNA的复制、转录和翻译等机制。同其它作物一样,水稻叶绿素突变体是常见的,并被用来作为水稻育种中测定诱发突变率的一种手段。... 详细信息

叶绿素突变体的重要性,体现在细胞器能量转换效应,包括整个酶的过程和光合作用所必需的成份如DNA、RNA以及DNA的复制、转录和翻译等机制。同其它作物一样,水稻叶绿素突变体是常见的,并被用来作为水稻育种中测定诱发突变率的一种手段。叶绿素突变体的叶绿素含量通常减少。在某些情况下,色素的一部分能存活,一部分不能存活。尽管认

关键词：叶绿素突变体产量叶绿素含量水稻水稻品种发生率

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

软件工程中的问题及前景

计算机工程与应用 1986年第1期 13-28页

作者： c.V.Ramamoorthy,Atul prakash,Wei-Tek Tsai,Yutaka Usuda,刘景 Trans.on software Engineering Trans.on software Engineering Trans.on software Engineering Trans.on software Engineering 主编 Uc教授博士 IEEE 主编 Uc教授博士 IEEE 主编 Uc教授博士 IEEE 主编 Uc教授博士 IEEE

随着软件应用问题越来越复杂,软件工程必将获得发展。规范语言(Specificationlanguages)、快速放样(rapid prototyping),复杂性度量(complexity metrics)和维护技术(maintenance techniques)将是其最重要的成果。

关键词：软件设计规范软件工程代价估计可靠性增长模型可执行规范程序员维护代价软件生存期

Improvement of Plasma Performance with Lithium Wall conditioning in Aditya Tokamak

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2013年第2期15卷 123-128页

作者： M. B. cHOWDHURI R. MANcHANDA J. GHOSH S. B. BHATT Ajai KUMAR B. K. DAS K. A. JADEJA P. A. RAIJADA Manoj KUMAR S. BANERJEE Nilam RAMAIYA Aniruddh MALI Ketan M. PATEL Vinay KUMAR P. VASU R. BHATTAcHARYAY R. L. TANNA Y. Shankara JOISA P. K. ATREY c. V. S. RAO D. chenna REDDY P. K. cHATTOPADHYAY R. jha Y. c. SAXENA Aditya team Institute for Plasma Research Bhat Gandhinagar 382 428 India

Lithiumization of the vacuum vessel wall of the Aditya tokamak using a lithium rod exposed to glow discharge cleaning plasma has been done to understand its effect on plasma performance. After the Li-coating, an increment of ~100 eV in plasma electron temperature has been observed in most of the discharges compared to discharges without Li coating, and the shot reproducibility is considerably improved. Detailed studies of impurity behaviour and hydrogen recycling are made in the Li coated discharges by observing spectral lines of hydrogen, carbon, and oxygen in the visible region using optical fiber, an interference filter, and PMT based systems. A large reduction in O I signal （up to ~40% to 50%） and a 20% to 30% decrease of Ha signal indicate significant reduction of wall recycling. Furthermore, VUV emissions from O V and Fe XV monitored by a grazing incidence monochromator also show the reduction. Lower Fe XV emission indicates the declined impurity penetration to the core plasma in the Li coated discharges. Significant increase of the particle and energy confinement times and the reduction of Zeff of the plasma certainly indicate the improved plasma parameters in the Aditya tokamak after lithium wall conditioning.

关键词： lithiumization wall conditioning impurity Aditya tokamak

维普期刊数据库