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Performance assessment of prefabricated vertical drains in mitig.ting.soil reliquefaction subjected to repeated seismic events using.shaking.table experiments

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Frontiers of Structural and Civil Eng.neering 2024年第3期18卷 411-427页

作者： gowtham PADMANABHAN g.nesh Kumar SHANMUg.M Department of Earthquake Eng.neering Indian Institute of Technology RoorkeeUttarakhand 247667India g.otechnical Eng.neering.Division CSIR-Central Building.Research Institute Academy of Scientific and Innovative Research(AcSIR)Uttarakhand 247667India

The use of prefabricated vertical drains(PVD)in liquefiable deposits is g.ining.attention due to enhanced ***,investig.tions on PVD in mitig.ting.re-liquefaction during.repeated shaking.events are not *** study performed a series of shaking.table experiments on untreated and PVD-treated specimens prepared with 40%and 60%relative *** sinusoidal loading.was applied with an incremental peak acceleration of 0.1g.0.2g.0.3g.and 0.4g.at 5 Hz shaking.frequency with 40 s *** performance of treated g.ound was evaluated based on the g.neration and dissipation of excess pore water pressure(EPWP),induced sand densification,subsidence,and cyclic stress *** addition,the strain accumulated in fresh and exhumed PVD was investig.ted using.g.otextile tensile testing.apparatus aided with dig.tal imag. *** evidence of pore pressure was reported up to 0.2g.peak acceleration for 40%and 60%relative density *** continuous occurrence of soil densification and drainag. medium restrained and delayed the g.neration of EPWP and expedited the dissipation *** study demonstrates PVD can mitig.te re-liquefaction,without suffering.from deterioration,when subjected to medium to hig. intense repeated shaking.events.

关键词： prefabricated vertical drains drainag. re-liquefaction shaking.table dig.tal imag. correlation

Experimental studies on liquefaction and reliquefaction potential of saturated g.ound subjected to repeated incremental acceleration loading.with varying.shaking.duration

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Earthquake Eng.neering.and Eng.neering.Vibration 2023年第4期22卷 909-920页

作者： gowtham Padmanabhan g.nesh Kumar Shanmug.m Department of Earthquake Eng.neering Indian Institute of Technology RoorkeeRoorkeeUttarakhand 247667India g.otechnical Eng.neering.Division CSIR-Central Building Research InstituteAcademy of Scientific and Innovative Research(AcSIR)RoorkeeUttarakhand 247667India

Past research has focused on the factors that influence liquefaction under normal shaking.***,studies on parameters that influence the reliquefaction potential of saturated deposits during.repeated shaking.events are *** this study,an attempt has been made to examine the influence of acceleration amplitude and shaking.duration on liquefaction and reliquefaction potential under repeated shaking.conditions is conducted.1-g.uni-axial shaking.table experiments were performed on saturated g.ound prepared with 40%and 60%relative *** prepared g.ound was subjected to alternate long.r and shorter shaking.durations(40 and 20 s)of repeated incremental 0.1 g.0.2 g.0.3 g.and 0.4 g.acceleration loading.*** variation in density,excess pore water pressure(EPWP),cyclic resistance ratio(CRR)and surface settlement were *** results showed that due to repeated incremental shaking.events,reliquefaction was observed on the prepared *** long.r shaking.duration,the post-liquefied soil showed density improvement with improved soil ***,the application of shorter duration loading.followed by long.r shaking.reduced the beneficial effect of density improvement by disturbing.the densified *** to this,the g.ound was found to be more susceptible to reliquefaction in the subsequent incremental long.r shaking.event.

关键词： 1g.shaking.table reliquefaction acceleration amplitude shaking.duration relative density

A dig.tal assistant for shading.paper sketches

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Visual Computing.for Industry,Biomedicine,and Art 2020年第1期3卷 152-167页

作者： Amal Dev Parakkat Hari Hara gowtham Sarang.Joshi Ramanathan Muthug.napathy Indian Institute of Technolog. Madras Chennai 600036India Indian Institute of Technolog. g.wahati Assam 781039India

We present a mixed reality-based assistive system for shading.paper *** a paper sketch made by an artist,our interface helps inexperienced users to shade it ***,using.a simple Delaunaytriang.lation based inflation alg.rithm,an approximate depth map is *** system then hig.lig.ts areas(to assist shading.based on a rendering.of the 2.5-dimensional inflated model of the input *** the help of a mixed reality system,we project the hig.lig.ted areas back to aid *** hints g.ven by the system are used for shading.and are smudg.d appropriately to apply an artistic shading.to the *** user is g.ven flexibility at various levels to simulate conditions such as heig.t and lig.t *** show that the proposed system aids novice users in creating.sketches with impressive shading.

关键词： Shading Paper sketch Mixed reality Iso-contours Delaunay triang.lation Dig.tal art

Desig., Thermodynamic Performance Comparison and Cost Analysis of Photovoltaic (PV), Concentrated Solar Power (CSP), Wind Turbine, Natural g.s Combined Cycle (Ng.C), and Integ.ated Solar Combined Cycle (ISCC) Power Plants

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Energ. and Power Eng.neering 2020年第6期12卷 288-313页

作者： Peter Jenkins gowtham Ramamoorthy Department of Mechanical Eng.neering University of Colorado Denver USA

This paper evaluates and discusses ways to use five energ. resources more efficiently for g.nerating.electric power. An analysis of five different 10 MW powerplants was made: a photovoltaic system, a concentrated solar power system, wind turbines, a natural gas combined cycle and an integrated solar combined cycle. Also, each power plant’s operating principle, thermodynamic analysis, economic analysis, and simulation evaluation were made using.the System Advisor Model (SAM), Eng.neering.Equation Solver (EES), and the Thermoflow Power Plant Simulation prog.am. From the analysis, the power plant capacity factor, g.id availability, levelized cost of electricity, and annual energ. production are compared and analyzed to determine a suitable power plant for a g.ven location.

关键词： Renewable Energ. PV CSP Wind Turbine Ng.C ISCC

Solar Desalination with Latent Heat Storag. Materials and Solar Collector

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Journal of Mechanics Eng.neering.and Automation 2011年第2期1卷 126-134页

作者： gowtham Mohan Hari Narayanan Soundararajan Department of Mechanical Eng.neering Thiagarajar College of Engineering Madurai Tamil Nadu 625015 India

Availability of clean water is g.ing.to become one of big.est demands of the country. Even thoug. there arc various technolog.es available for purification of water harnessing.solar energ. fits the purpose for future problems. Distillation is one of many processes available for water purification, and solar energ. is one of several forms of heat energ. that can be used to energ.ze this process. In this review a study is made to enhance the productivity of the solar stills by connecting.solar still with latent heat storag. and solar air heater in series and other factors like improving.evaporation rate by maintaining.Low depth, more exposure area, heat addition by solar collector and presence of latent heat storag. material, which is a paraffin wax as a integ.al part of still. Latent heat storag. is one of the most efficient ways of storing.thermal energ.. Unlike the sensible heat storag. method, the latent heat storag. method provides much hig.er storag. density, with a smaller temperature difference between storing.and releasing.heat. Further aug.entation of the yield by scraps, pebble, and sand are added.

关键词： Distillation latent heat storag. solar still paraffin wax solar collector.

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极地船舶结构设计思考

中国舰船研究 2022年第5期17卷 212-219页

作者： Bernt J.LEIRA 柴威 gowtham RADHAKRISNAN 挪威科技大学海洋技术系挪威特隆赫姆7491 武汉理工大学船海与能源动力工程学院湖北武汉430063

冰脊和冰山与极地船体发生碰撞将影响船体结构安全,并决定船体结构设计载荷。船体结构设计应遵循基于风险的设计原则,通常涉及以下极限状态设计准则:1)服务极限状态(SLS);2)最终极限状态(ULS);3)疲劳极限状态(FLS);4)事故极限状态(ALS)... 详细信息

冰脊和冰山与极地船体发生碰撞将影响船体结构安全,并决定船体结构设计载荷。船体结构设计应遵循基于风险的设计原则,通常涉及以下极限状态设计准则:1)服务极限状态(SLS);2)最终极限状态(ULS);3)疲劳极限状态(FLS);4)事故极限状态(ALS)。最终极限状态和事故极限状态对应于发生概率极低的船与冰脊作用以及冰山撞击事件,旨在确保船体结构不会完全损毁。然而,对于较低概率水平的冰载荷分析,需进行较大数据量的工况分析,计算耗时无法承受。为此,引入环境等值轮廓方法,来大幅减少冰载荷分析所需工况数量,并给出设计工况最有可能的冰体参数组合方式。结合最终极限状态和事故极限状态,举例说明这一方法的运用方式。环境等值轮廓方法可为现有极地船舶船体结构设计方法提供有效补充。

关键词：极地船舶船–冰作用环境等值轮廓法船舶结构设计冰载荷

TiNiHf/SiO_(2)/Si shape memory film composites for bidirectional micro actuation

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International Journal of Smart and Nano Materials 2022年第2期13卷 293-314页

作者： Sabrina M.Curtis Marian Sielenkamper gowtham Arivanandhan Duyg. Deng.z Zixiong.Li Justin Jetter Lisa Hanke Lars Bumke Eckhard Quandt Stephan Wulfing.off Manfred Kohl Institute for Materials Science Kiel University(CAU)KielGermany Materials Science and Eng.neering University of MarylandCollege ParkMDUnited States Institute of Microstructure Technolog. Karlsruhe Institute of Technology(KIT)KarlsruheGermany

The martensitic phase transformation in Ti_(40.4)Ni_(48)Hf_(11.6) shape memory alloys is leverag.d for bi-directional actuation with TiNiHf/SiO_(2)/Si *** shape memory properties of mag.etron sputtered Ti_(40.4)Ni_(48)Hf_(11.6) films annealed at 635℃-5 min are influenced by film thickness and the underlying.*** TiNiHf film thick-ness from 21μm to 110 nm results in the reduction of all characteristic transformation temperatures until a critical thickness is ***,Ti_(40.4)Ni_(48)Hf_(11.6) thin films as low as 220 nm show transfor-mations above room temperature when deposited on SiO_(2) buffer layer,which is of g.eat interest in *** comparison,220 nm films on Si substrates are austenitic at room temperature,and thus not suitable for *** fatig.e tests on TiNiHf/SiO_(2)/Si bimorphs demonstrate better functional fatig.e characteristics than freestanding.films,with an averag. reduction of 15℃ after 125 cycles,with tempera-ture stabilization *** bi-directional actuation results are promising.in the development of bistable actuators within a PMMA/TiNiHf/Si trimorph composite,whereby the additional PMMA layer underg.es a g.ass transition at 105℃.With the aid of constitutive modeling.a route is elaborated on how bistable actuation can be achieved at micro-to nanoscales by showing.favorable thickness combinations of PMMA/TiNiHf/Si composite.

关键词： Bimorph microactuator NiTiHf bistable actuator shape memory alloy thin films

Investig.tion of FOXP3 (rs3761548) polymorphism with the risk of preeclampsia and recurrent spontaneous abortion: A systemic review and meta-analysis

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Asian pacific Journal of Reproduction 2022年第3期11卷 117-124页

作者： g.vinda Sri Varshini Sivakumar Harshini Muhammed Ali Siham g.vindaraj Krishnamurthy Tejaswini Yasam Santhosh Kumar Lang.swaran Kulanthaivel gowtham Kumar Subbaraj Faculty of Allied Health Sciences Chettinad Hospital and Research InstituteChettinad Academy of Research and Education(Deemed to be University)KelambakkamTamil Nadu 603103India Department of Bioinformatics Alagappa UniversityKaraikudi-630003Tamil NaduIndia

Objective:To investig.te the association between forkhead box P3(FOXP3)(rs3761548)polymorphism and the risk of preeclampsia and recurrent spontaneous ***:Literature on the association of FOXP3 g.ne polymorphisms and susceptibility to preeclampsia and unexplained recurrent spontaneous abortion was retrieved by searching.databases such as PubMed,Science Direct,g.og.e Scholar and Embase from 2000 to *** association measure was analyzed using.an odds ratio(OR)and 95%confidence interval(CI).All the statistical analyses were executed using.RevMan 5.4 ***:In the present meta-analysis,11 articles were *** pooled results showed no association between FOXP3 g.ne polymorphism(rs3761548)and preeclampsia risk in allelic,recessive,dominant and over dominant contrast ***3 g.ne polymorphism(rs3761548)showed an association with recurrent abortion in allelic,recessive and dominant models(OR 1.85,CI 1.59-2.14;OR 2.02,95%CI 1.56-2.62;OR 2.69,95%CI 1.50-4.83,respectively),while no association in the over dominant contrast model(OR 1.35,CI 0.87-2.10).Conclusions:In the present study,FOXP3 g.ne(rs3761548)polymorphism is associated with risk of recurrent spontaneous abortion but not ***,larg.r sample size and multiracial studies are needed in the future to confirm the finding..

关键词： Preeclampsia FOXP3 g.ne Sing.e nucleotide polymorphism rs3761548 Unexplained recurrent spontaneous abortion

A case on hemiballismus due to uncontrolled diabetes

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Journal of Acute Disease 2019年第2期8卷 84-85页

作者： Mandla gowtham Chandrasekar Supriya Dudekula Seetharambabu g.pineni Divya Sri Padmavathi School of Pharmacy Vyshnavi NagarMohan GardensTiruchanoorTirupati ***India

Uncontrolled diabetes g.ves rise to severe systemic complications that affect different systems of our body. Among.those complications, hemiballismus is a rare manifestation that occurs due to hyperg.ycemia and can be reversible in most cases by decreasing.elevated sug.r levels to normal rang.. Here, we present a case of a patient with diabetic history since 10 years ag., who presented with uncontrolled jerky movements on one side of his body since 15 d, and he recovered after appropriate therapy. Medication adherence in diabetic patients and reg.lar monitoring.of blood sug.r levels are important.

关键词： Hemiballismus Jerking movements Medication adherence Corpus striatum Basal g.ng.ia