检索结果-南通市图书馆

Effect of exhaust gas recirculation and ethyl hexyl nitrate additive on biodiesel fuelled diesel engine for the reduction of NOx emissions

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2012年第3期6卷 304-310页

作者： k. venkateswarlu B. S. R. MURTHY V. V. SUBBARAO k. Vijaya k.MAR Mechanical Engineering Department K.L University Guntur 522502India Mechanical Engineering Department Q.I.S College of Engineering and Technology Ongole 523272 India Mechanical Engineering Department J.N.T.U Kakinada Kakinada533033 India

Cetane improvers reduce the ignition delay, which in turn reduces the combustion temperatures thereby reduce NOx emissions. Exhaust gas recirculation （EGR） proved to be an effective way to reduce the NOx emissions. In this present experimental work. a combination of exhaust gas recirculation and cetane improver ethyl hexyl nitrate （EHN） is used to investigate the performance and exhaust emissions of a single cylinder four strok. naturally aspirated direct injection and air cooled diesel engine. Test results show that the brak. thermal efficiency increases with the increase in the percentage of EGR which is accompanied by a reduction in brak. specific fuel consumption and exhaust gas temperatures, and that bio- diesel with cetane improver under 20% EGR reduces NOx emissions by 33% when compared to baseline fuel without EGR. However carbon monoxide （CO）, hydro carbon （HC） and smok. emissions increase with an increase in percentage of EGR.

关键词： additive exhaust gas recirculation (EGR),emissions ethyl hexyl nitrate (EHN) performance

Effect of Beryllium Aluminum Cyclosilicate on Thermal Expansion Behavior of Al-Based Composites

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 Minerals and Materials Characterization and Engineering 2017年第3期5卷 140-152页

作者： V. Bharat B. Durga Prasad k. venkateswarlu Department of Mechanical Engineering JNTUA Anantapuramu India CSIR-National Aerospace Laboratories Bangalore India

Beryllium aluminum cyclosilicate, an ore of beryllium was reinforced in Aluminum matrix to fabricate Al-beryl composites using powder metallurgy. Effect of the content of beryllium aluminum cyclosilicate on microstructural hardness and thermal expansion was studied. The coefficient of thermal expansion of Al-beryl composite was measured in the temperature range between 50oC to 360oC using dilatometer and was theoretically studied using thermo-elastic models, and these models were used to explain abnormalities observed experimentally. The hardness of Al-beryl metal matrix composites increased with the increase in beryl percentage. Vacuum sintering of Al-beryl metal matrix composites at 600oC inhibited excellent bonding between the matrix and the particulate increasing the strength of the composite. The result shows the CTE significantly increased with increasing temperature but decreased with increasing reinforcement. At higher temperatures, CTE of Al-beryl metal matrix composites with 5 wt%, 10 wt% and 15 wt% of beryllium aluminum cyclosilicate was 21 ppm/k. 18.2 ppm/k. and 16.8 ppm/k. The CTE values were found to be comparable with theoretical results. The turner model showed conformance with experimental results, was well suited to the experimental results.

关键词： Al-Beryl MMCs Powder Metallurgy Hardness Coefficient of Thermal Expansion (CTE) Thermo-Elastic Models

Hydrothermal fabrication of selectively doped organic assisted advanced ZnO nanomaterial for solar driven photocatalysis

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 Environmental Sciences 2015年第8期27卷 248-255页

作者： k.Namratha k.Byrappa S.Byrappa P.venkateswarlu D.Rajasek.ar B.k.Deepthi Center for Material Science and Technology Vijnan Bhavan Manasagangotri P.B.No 21 University of Mysore Department of Materials Science and Engineering Stony Brook University Department of Chemistry Sri Venkateswara University

Hydrothermal fabrication of selectively doped（Ag＋＋ Pd3＋） advanced ZnO nanomaterial has been carried out under mild pressure temperature conditions（autogeneous; 150°C）.Gluconic acid has been used as a surface modifier to effectively control the particle size and morphology of these ZnO nanoparticles. The experimental parameters were tuned to achieve optimum conditions for the synthesis of selectively doped ZnO nanomaterials with an experimental duration of 4 hr. These selectively doped ZnO nanoparticles were characterized using powder X-ray diffraction（XRD）, Fourier transform infrared spectroscopy（FT-IR）, UV–Vis spectroscopy and scanning electron microscopy（SEM）. The solar driven photocatalytic studies have been carried out for organic dyes, i.e., Procion MX-5B dye,Cibacron Brilliant Yellow dye, Indigo Carmine dye, separately and all three mixed, by using gluconic acid modified selectively doped advanced ZnO nanomaterial. The influence of catalyst, its concentration and initial dye concentration resulted in the photocatalytic efficiency of 89% under daylight.

关键词： Hydrothermal technique Gluconic acid surface modification Selectively doped ZnO Photocatalytic degradation

Pyoderma Gangrenosum with Oral Involvement–Case Report and Review of the Literature

在线全文

学校读者我要写书评

暂无评论

International Journal of Oral Science 2010年第2期2卷 111-116页

作者： Geetha Paramk.sam venkateswarlu Meduri Naresh Gangeshetty Department of Oral Medicine and Radiology Kaminein Institute of Dental Sciences

Pyoderma gangrenosum （PG） is a rare, noninfectious neutrophilic dermatosis. Clinically, it begins with sterile pustules that rapidly progress into painful ulcers of variable depth and size with undermined violaceous borders. The diagnosis of PG is based on the history of an underlying disease, a typical clinical presentation, histopathology, and exclusion of other diseases. The peak.incidence occurs between the ages of 20 to 50 years with women being more often affected than men. There have been very few reports of pyoderma gangrenosum with oral mucosal involvement. Oral lesions in previously reported cases have included ulcers of varying sizes from a few mm to several cm and have been reported to have been found on the tongue, soft and hard palate, buccal mucosa, and gingiva. Some of these oral lesions have been associated with ulcerative colitis, inflammatory bowel disease, and polycythemia rubra vera. A few cases were reported with biopsy findings, the histological picture being nonspecific, showing ulceration, and necrosis with inflam- matory cell infiltrate. A peculiar case of pyoderma gan- grenosum with an oral lesion is presented here, and the differential diagnosis is discussed.

关键词： pyoderma gangrenosum oral lesion of pyoderma gangrenosum diagnosis

Effect of Impeller Geometry and Tongue Shape on the Flow Field of Cross Flow Fans

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2003年第2期12卷 118-125页

作者： M.Govardhan G.venkateswarlu Department of Mechanical Engineering Indian Institute of Technology MadrasChennai 600 036IndiaDepartment of Mechanical EngineeringIndian Institute of Technology MadrasChennai 600 036India

Experiments were conducted to investigate the effect of impeller geometry and tongue shape on the flow field of cross flow *** impellers(Ⅰ，Ⅱ，Ⅲ）having same outer diameter,but different radius ratio and blade angles were employed for the *** impeller was tested with two tongue *** survey was carried out for each impeller and tongue shape at two flow *** for each flow coefficient at different circumferential *** flow is two-dimensional along the blade span except near the *** total pressure developed by the impellers in each case is found to be maximum at a circumferential position of around 270°.The total and static pressures at the inlet of impellers are more or less same regardless of impeller and tongue geometry,but they vary considerably at exit of the *** Ⅲ with tongue T2 develops higher total pressure and efficiency where as impeller Ⅱ with tongue T2 develops minimum total *** diffusion and smaller vortex size are the reasons for better performance of impeller Ⅲwith tongue T2。

关键词： Impeller tongue circumferential position flow coefficient eccentric vortex total pressure coefficient static pressure coefficient.

Computational Fluid Dynamics Study of a Compound Flow Field for Proton Exchange Membrane Fuel Cell(PEMFC) Performance Enhancement

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2022年第6期31卷 2374-2384页

作者： venkateswarlu VELISALA Gandhi PULLAGURA Naveen k.mar CHINNAM Raju GANTA Automobile Engineering Section Damacharla Anjaneyulu Government PolytechnicOngole 523002Andhra PradeshIndia GITAM Institute of Technology Visakhapatnam 530045Andhra PradeshIndia Vishnu Institute of Technology Bhimavaram 534202Andhra PradeshIndia BVC Engineering College Odalarevu 533210Andhra PradeshIndia

The aim of the present work.is to evaluate proton exchange membrane(PEM) fuel cell performance with a modified serpentine flow field with right angle turn by numerical modeling. A 3-D PEM fuel cell model of size 50 cm^(2) active area is developed. A conventional serpentine flow field is modified and the same is considered for the supply of reactants. Computational fluid dynamics(CFD) based simulations were conducted to analyse the pressure drop, distribution of reactants(H_(2) and O_(2)), liquid water activity, current flux density and water content in the membrane. From the simulation results, polarization curve is drawn to validate the literature data of PEMFC with the conventional serpentine flow field. Comparison of simulated polarization curve with literature data revealed that modified serpentine flow field performance is better than conventional serpentine flow field as it offers better water exclusion and uniform sharing of reactants. From this study, it is concluded that model of flow field pattern influences the functioning of fuel cell and utmost care must tak. while selecting a pattern for flow field of PEM fuel cell.

关键词： PEM fuel cell CFD current density water removal modified serpentine flow field membrane water content

A rare case of intraoral lipoma in a six year-old child:a case report

在线全文

学校读者我要写书评

暂无评论

International Journal of Oral Science 2011年第1期3卷 43-46页

作者： Meduri venkateswarlu Paramk.sam Geetha Mandadi Srik.nth Department of Oral Medicine and Radiology Kamineti Institute of Dental SciencesNarketpally Andhra Pradesh 508254 India

One type of soft tissue lesions of the oral cavity is lipoma, which is a k.nd of benign tumor composed of mature lipid cells. Although the lipoma presents as one of the most common mesenchymal neoplasms, most tend to develop on the trunk.and proximal portions of the extremities. However, lipomas in the oral and maxillofacial region are much less frequent. Here we present a case of an intraoral lipoma in a six year-old child.

关键词： lipoma mature fat cells fibrolipoma

Non-static plane symmetric inflationary Universe in scalar tensor theory

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2012年第6期12卷 636-642页

作者： Rangavajhala venkateswarlu Janjeti Satish k.k.rlapati Pavan k.mar GITAM School of International Business GITAM UniversityVisakhapatnam530045India Vignan's Institute of Engineering for Women Visakhapatnam530046India Narasaraopet Engineering College Narasaraopet522601India

Non-static plane symmetric cosmological solutions are presented in the presence of cosmic strings in the scalar-tensor theory of gravitation formulated by Sen ＆ Dunn. It is shown that string cosmological models representing geometric strings （ρ = λ） and massive strings （ρ ＋λ = 0） do exist in this theory. Further, it is found that the Tak.bayasi string, i.e. ρ= （1 ＋ζ）λ, does not exist. Some physical and geometrical features of these models are discussed.

关键词： string fields -- inflation -- plane symmetry -- acceleration of particles-- gravitation

Developing Mg–Zn surface alloy by friction surface allosying: In vitro degradation studies in simulated body fluids

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2020年第7期27卷 962-969页

作者： venkateswarlu Badisha Shabana Shaik.Ravik.mar Dumpala B.Ratna Sunil Department of Metallurgical and Materials Engineering Rajiv Gandhi University of Knowledge Technologies(AP-IIIT)Nuzvid 521202India Department of Mechanical Engineering Rajiv Gandhi University of Knowledge Technologies(AP-IIIT)Nuzvid 521202India Department of Mechanical Engineering Visvesvaraya National Institute of TechnologyNagpur 440010India Department of Mechanical Engineering Bapatla Engineering CollegeBapatla 522101India

A new variant of friction-assisted process named friction surface alloying(FSA)for developing surface alloys was demonstrated in the present *** FSA,the dispersed phase is melted and allowed to react with the matrix material to form an alloy at the surface of a metallic *** the present work.magnesium(Mg)sheets and zinc(Zn)powder were selected,and fine grained(~3.5μm)Mg–Zn surface alloy with improved hardness was produced by FSA.X-ray diffraction studies confirmed the formation of intermetallic phases of Mg and Zn at the *** the in vitro degradation studies carried out by immersing in simulated body fluids,a lower corrosion rate was observed for the Mg–Zn surface alloy compared with pure *** surface morphologies after immersion studies indicated large degraded areas on the base Mg compared with Mg–*** results demonstrate the potential of FSA in developing Mg-based surface alloys without melting the substrate to impart better surface properties.

关键词： friction stir processing,surface alloy magnesium zinc corrosion degradation