ChemRN: Engineering Materials (Topic)最新文献_第2页

One Dimensional Unsteady Flow Analysis Using HEC-RAS Modelling Approach for Flood in Navsari City 基于HEC-RAS模型的Navsari市一维非定常流分析

ChemRN: Engineering Materials (Topic) Pub Date : 2019-03-13 DOI: 10.2139/ssrn.3351780

Patel K B, Yadav S.M

{"title":"One Dimensional Unsteady Flow Analysis Using HEC-RAS Modelling Approach for Flood in Navsari City","authors":"Patel K B, Yadav S.M","doi":"10.2139/ssrn.3351780","DOIUrl":"https://doi.org/10.2139/ssrn.3351780","url":null,"abstract":"Flood is a natural tragedy which occurs as a consequence of tremendous rainfall occurrence. Navsari city and part of villages nearby Navsari lie on the Purna river bank which is a flood affected region. The Purna River flood disturbs common people’s day to day life in the city as well as the surrounding villages nearby Navsari very frequently. The perception of the processes behind flood is required to provide a good and efficient way to protect areas at risk. The present study uses the Hydrologic Engineering Center’s River Analysis System (HEC-RAS 4.1.0) Model for the flood analysis. For the flood discharge of 2004 and 2013, water surface heights were calculated. The unsteady flow computations were carried out for the past flood events of the year 2004 and 2013 for High tide and low tide conditions separately for Purna Basin. A total of 128 cross sections along the main river close to the city were taken into consideration for unsteady flow simulations. The Purna river passes through the densely populated Navsari city which is more vulnerable to flood. In this study, cross-sections and past observed flood data have been used to develop a 1-D integrated hydraulic model of Purna River. The calibrated HFL value was also validated with the observed HFL value. The result shows that the selected study area was more affected by the flood. In order to avoid the losses due to floods in future, it is recommended to increase the height of embankment, to provide stone pitches and embankment along the study reaches to prevent flooding of the adjoining areas.","PeriodicalId":156312,"journal":{"name":"ChemRN: Engineering Materials (Topic)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116849055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Tribological Behaviour of Thermally Sprayed Coatings: A Review 热喷涂涂层摩擦学性能研究进展

ChemRN: Engineering Materials (Topic) Pub Date : 2018-12-13 DOI: 10.2139/ssrn.3323697

S. Rukhande, W. Rathod, D. Bhosale

{"title":"Tribological Behaviour of Thermally Sprayed Coatings: A Review","authors":"S. Rukhande, W. Rathod, D. Bhosale","doi":"10.2139/ssrn.3323697","DOIUrl":"https://doi.org/10.2139/ssrn.3323697","url":null,"abstract":"Coatings are used for modifying the surface properties of critical components subjected to mechanisms such as corrosion, oxidation, wear, or under an excessive heat load failure. Selection of the coating material and method of depositions are very important for any application. Coatings are effectively and economically used to guard the substrate surface from wear also to reduce friction. The tribological response of a coating system depends on many factors like coating properties, counterpart, substrate, interface, and running conditions. Hence, selection of the appropriate coating for a given tribological application is difficult. Thermally sprayed WC and CrC based cermet coatings are extensively used in the hydro turbine for resistance to wear like abrasive, erosive and cavitation. The NiCrAlY coating showed better resistance to high-temperature oxidation and corrosion due to the formation of protective oxides. At high temperature working environment and chemically aggressive condition NiCrSiBC alloy reveals a good balance between corrosion and wear resistance. The NiCrBSi coating showed a good surface finish as well as the bonding interface. This paper presented the review related to the selection of coating powder and process of protective wear resistance coating by thermal spray techniques. The effect of spraying techniques and spraying parameters on the performance of the coating is different for every coating. The wear types, powders, Plasma spray and HVOF spray methods are discussed to identify the coating for a specific application.","PeriodicalId":156312,"journal":{"name":"ChemRN: Engineering Materials (Topic)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114311940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Tribological Performance of PTFE Filled with 40% Bronze against Different Surface Textured Patterns 40%青铜填充PTFE对不同表面纹理的摩擦学性能

ChemRN: Engineering Materials (Topic) Pub Date : 2018-12-13 DOI: 10.2139/ssrn.3328459

V. S. Aher, U. Shirsat, G. J. Vikhe Patil

{"title":"Tribological Performance of PTFE Filled with 40% Bronze against Different Surface Textured Patterns","authors":"V. S. Aher, U. Shirsat, G. J. Vikhe Patil","doi":"10.2139/ssrn.3328459","DOIUrl":"https://doi.org/10.2139/ssrn.3328459","url":null,"abstract":"PTFE, a thermoplastic polymer is having low friction coefficient, excellent corrosion resistance, chemical inertness and wide range of service temperature. Due to its poor wear and abrasion resistance, its applications are widely limited. The wear resistance of PTFE can be significantly improved by addition of suitable filler material. Bronze filled PTFE composites produces very thick, uniform and adherent transfer films of both PTFE and Bronze. Surface Texturing is a phenomenon to reduce contact area between two mating surfaces which affects friction and wear behaviour of material. Therefore, in this research, the friction and wear behaviour of PTFE composite filled with 40% Bronze particles at varying load and sliding velocity was studied. Test pins of PTFE composite were tested against textured stainless steel disc under dry and wet sliding conditions using Pin-On –Disc tribometer (TR-20LE) at NTP. There were three types of textured patterns made on the disc i.e. circular, elliptical and square. It was observed that the total wear loss due to friction and wear increases with increase in load as well as increase in sliding velocity. The lowest wear loss was found for PTFE composite filled with 40% Bronze, when circular textured pattern was used under wet sliding condition.","PeriodicalId":156312,"journal":{"name":"ChemRN: Engineering Materials (Topic)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130668621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Materials Science: Academic Laboratory Experiments 材料科学:学术实验室实验

ChemRN: Engineering Materials (Topic) Pub Date : 2018-01-01 DOI: 10.2139/ssrn.3599940

Mahmood H. Shubbak

引用次数: 1

Marble Wastes Recycling: Design and Synthesis of Low-Temperature Calcium Silicate Hydrate Under Various CaO:SiO 2 Ratio and Alkalinity 大理石废料回收:不同CaO: sio2比和碱度下低温水合硅酸钙的设计与合成

ChemRN: Engineering Materials (Topic) Pub Date : 1900-01-01 DOI: 10.2139/ssrn.3873673

E. Kamseu, V. A., R. Rosa, D. N., D. Sanna, A. Mariani, C. Leonelli

{"title":"Marble Wastes Recycling: Design and Synthesis of Low-Temperature Calcium Silicate Hydrate Under Various CaO:SiO 2 Ratio and Alkalinity","authors":"E. Kamseu, V. A., R. Rosa, D. N., D. Sanna, A. Mariani, C. Leonelli","doi":"10.2139/ssrn.3873673","DOIUrl":"https://doi.org/10.2139/ssrn.3873673","url":null,"abstract":"Marble sludge wastes (MSW) are investigated as solid precursor for the production of low-temperature calcium silicate hydrate (CSH). Calcined powder of MSW is ball-milled with rice husk ash (RHA) and the slurries are treated in oven at 100C for 24 hours in a context where water evaporation is minimized. The initial CaO:SiO2 molar ratio varies from 1 to 3 (CS, C2S and C3S) and the solution used for the preparation of the calcium silicate hydrate presents NaOH with concentration of 0, 1, 2 and 3 N. FTIR, XRD, Particle size distribution, BET surface area and Environmental Scanning Electron Microscope (ESEM) permitted to confirm the formation of CxS (x = 1, 2, 3) and CSH at 100̊C through pozzolanic reactions. The increase of the alkalinity of the solution improved the silica dissolution and enhances the formation of CxS and CSH up to 2N. Further increase of the alkalinity affected the silica polymerization, the particle size and the concentration of CxS and CSH into the final matrix. Precursor with CaO:SiO2 = 1 seem to promote more monomers while 2CaO:SiO2 and 3CaO:SiO2 resulted in orthosilicate chains and interlayer respectively. The high reactivity and fine particles (ϕ < 32 nm) of CSH obtained appeared promising for the design of low-cost, environmentally-friendly and sustainable binders as well as others engineering applications including refractory precursors, hydroceramics, insulating matrices, filtration and catalysis.","PeriodicalId":156312,"journal":{"name":"ChemRN: Engineering Materials (Topic)","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124957022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fast Reversible Pseudocapacitance Enhanced Na-Ion Storage on in Situ Surface Functionalized Ultrathin Carbon Nanosheets 在原位表面功能化超薄碳纳米片上快速可逆伪电容增强na离子存储

ChemRN: Engineering Materials (Topic) Pub Date : 1900-01-01 DOI: 10.2139/ssrn.3945385

Vinodkumar Etacheri, R. Maça, Venkata Sai Avvaru, C. Hong, Abdullah A. Alazemi, V. Pol

{"title":"Fast Reversible Pseudocapacitance Enhanced Na-Ion Storage on in Situ Surface Functionalized Ultrathin Carbon Nanosheets","authors":"Vinodkumar Etacheri, R. Maça, Venkata Sai Avvaru, C. Hong, Abdullah A. Alazemi, V. Pol","doi":"10.2139/ssrn.3945385","DOIUrl":"https://doi.org/10.2139/ssrn.3945385","url":null,"abstract":"Disordered carbon is the state of the art anode material for Na-ion batteries due to their increased interlayer spacing and good electronic conductivity. However, its practical application is hindered by mediocre specific capacity, poor rate performance, low coulombic efficiency and limited cycling stability. Herein we report the superior pseudocapacitance enhanced Na-ion storage of in situ surface functionalized carbon nanosheets. Anodes composed of ultrathin (~15 nm) carbon nanosheets demonstrated excellent reversible specific capacity (375 mAh/g at 25 mA/g), rate performance (150 mAh/g at 2A/g), long-term cycling performance (110% after 1000 cycles at 1A/g) and coulombic efficiency (~100%). Considerably higher pseudocapacitance (up to ~78%) is also identified in this case compared to amorphous carbon particles. Spectroscopic and electrochemical studies proved Na-ion intercalation in to the disordered carbon and pseudocapacitive storage driven by oxygen-containing surface functional groups. Outstanding electrochemical performance is credited to the synergy between diffusion limited intercalation and pseudocapacitive surface Na-ion storage. The demonstrated synthetic method of in situ functionalized carbon nanosheets is inexpensive and scalable. The strategy of functional group and morphology induced pseudocapacitive Na-ion storage offer new prospects to design high-performance Na-ion battery electrodes.","PeriodicalId":156312,"journal":{"name":"ChemRN: Engineering Materials (Topic)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133738426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0