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Effect of a less permeable stronger soil layer on the stability of non-homogeneous unsaturated slopes

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Frontiers of Structural and Civil Engineering 2020年第6期14卷 1462-1475页

作者： Nabarun DEY Aniruddha sengupta Department of Civil Engineering Indian Institute of Technology KharagpurKharagpur 721302India

Slope failure occurs due to an increase in the saturation level and a subsequent decrease in matric suction in unsaturated *** paper presents the results of a series of centrifuge experiments and numerical analyses on a 55°inclined unsaturated sandy slope with less permeable,stronger silty sand layer inclusion within *** is observed that a less permeable,stronger silty sand layer in an otherwise homogeneous sandy soil slope hinders the infiltration of *** water content of the slope just above the stronger layer increases significantly,compared to *** shear band is found to initiate in a homogeneous sandy soil slope,whereas for a non-homogeneous slope,they initiate just above the less pervious,stronger layer.A discontinuity of the shear zone is also observed for the case of a non-homogeneous soil *** factor of safety of a non-homogeneous,unsaturated soil slope decreases because of the less permeable,stronger *** decreases significantly if this less permeable,stronger soil layer is located near the toe of the slope.

关键词： non-homogeneous slope stronger soil layer factor of safety centrifuge model test unsaturated soils

Behavior of braced wall embedded in saturated liquefiable sand under seismic loading

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Earthquake Engineering and Engineering Vibration 2021年第2期20卷 361-375页

作者： Sanku Konai Aniruddha sengupta Kousik Deb Department of Civil Engineering Indian Institute of Technology KharagpurKharagpur 721302India

It is well known that the generation of excess pore water pressure and/or liquefaction in foundation soils during an earthquake often cause structural *** paper describes the behavior of a small-scale braced wall embedded in saturated liquefiable sand under dynamic *** table tests are performed in the laboratory on embedded retaining walls with single *** tests are conducted for different excavation depths and base *** influences of the peak magnitude of the ground motions and the excavation depth on the axial forces in the bracing,the lateral displacement and the bending moments in the braced walls are *** shake table tests are simulated numerically using FLAC 2D and the results are compared with the corresponding experimental *** pore water pressures developed in the soil are found to influence the behavior of the braced wall structures during a dynamic *** is found that the excess pore water pressure development in the soil below the excavation is higher compared to the soil beside the ***,the soil below the excavation level is more susceptible to the liquefaction compared to the soil beside the walls.

关键词： braced wall FLAC 2D liquefaction seismic analysis shake table test

Self-Coexistence Among Cognitive Radio Networks Using Risk-Motivated Channel Selection Based Deference Structure

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Tsinghua Science and Technology 2013年第3期18卷 242-249页

作者： Kenneth Ezirim Shamik sengupta Department of Computer Science Graduate Center Department of Math. and Comp. Sci. John Jay College

Among cognitive radio networks there is a persistent trend of competition to acquire under-utilized and idle channels for data transmission. The competition for spectrum resources often results in the misuse of the spectrum resources as networks experience contention in attempt to access unoccupied spectrum bands. The competitive scenario causes cognitive radio networks to incur a huge amount of loss, which constitutes a major problem of self-coexistence among networks. As a way to minimize these losses we present a self-coexistence mechanism that allows cognitive radio networks to coexist with each other by implementing a risk-motivated channel selection based on deference structure. Cognitive radio networks form deference structure community to have more efficient access to a channel of interest and can defer transmission to one another on that channel, thereby minimizing the chances of conflicts. As part of the decision making process to become a member of a deference structure community, cognitive radio networks rely on a risk-motivated channel selection scheme to evaluate the tentative deference structure channel. We provide numerical and simulation results that demonstrates the benefits of the proposed self-coexistence mechanism and show how it helps networks to coordinate their spectrum activities, minimize contention experienced and improve their utility. We also emphasize on the importance of the deference structure community size with regards to the average performance of member networks.

关键词： dynamic spectrum access cognitive radio self-coexistence deference deference structure

Seismic behavior of cantilever wall embedded in dry and saturated sand

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Frontiers of Structural and Civil Engineering 2020年第3期14卷 690-705页

作者： Sanku KONAI Aniruddha sengupta Kousik DEB Department of Civil Engineering Indian Institute of Technology KharagpurKharagpur 721302India

The embedded cantilever retaining walls are often required for excavation to construct the undergroundfacilities. Significant numbers of numerical and experimental studies have been performed to understand the behavior ofembedded cantilever retaining walls under static condition. However, very limited studies have been conducted on thebehavior of embedded retaining walls under seismic condition. In this paper, the behavior of a small scale modelembedded cantilever retaining wall in dry and saturated sand under seismic loading condition is investigated by shaketable tests in the laboratory and numerically using software FLAC2D. The embedded cantilever walls are subjected tosinusoidal dynamic motions. The behaviors of the cantilever walls in terms of lateral displacement and bending momentare studied with the variation of the two important design parameters, peak amplitude of the base motions and excavationdepth. The variation of the pore water pressures within the sand is also observed in the cases of saturated sand. Themaximum lateral displacement of a cantilever wall due to seismic loading is below 1% of the total height of the wall in drysand, but in case of saturated sand, it can go up to 12.75% of the total height of the wall.

关键词： embedded cantilever wall shake table test FLAC2D seismic loading,saturated and dry sand

Behavior of braced excavation in sand under a seismic condition: experimental and numerical studies

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Earthquake Engineering and Engineering Vibration 2018年第2期17卷 311-324页

作者： Sanku Konai Aniruddha sengupta Kousik Deb Department of Civil Engineering Indian Institute of Technology Kharagpur

The behavior of braced excavation in dry sand under a seismic condition is investigated in this paper.A series of shake table tests on a reduced scale model of a retaining wall with one level of bracing were conducted to study the effect of different design parameters such as excavation depth,acceleration amplitude and wall *** analyses using FLAC 2D were also performed considering one level of *** strut forces,lateral displacements and bending moments in the wall at the end of earthquake motion were compared with experimental *** study showed that in a post-seismic condition,when other factors were constant,lateral displacement,bending moment,strut forces and maximum ground surface displacement increased with excavation depth and the amplitude of base *** study also showed that as wall stiffness decreased,the lateral displacement of the wall and ground surface displacement increased,but the bending moment of the wall and strut forces *** net earth pressure behind the walls was influenced by excavation depth and the peak acceleration amplitude,but did not change significantly with wall *** force was the least affected parameter when compared with others under a seismic condition.

关键词： braced excavation shake table test seismic FLAC 2D displacement

The role of Pbx1 in T cells

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Protein & Cell 2011年第12期2卷 946-949页

作者： Mayami sengupta Laurence Morel Department of Pathology Immunology and Laboratory MedicineUniversity of FloridaGainesvilleFL 32610USA

Tissue and organ differentiation is tightly controlled to ensure proper development and function of the growing embryo as well as cells such as lymphocytes that differentiate throughout the adult *** it is vital that the genes and the protein they encode that are involved in these processes function ***,any mutation or error that occurs along the way can result in extensive damage,which is expressed in various ways in the embryo and can result in immune pathogenesis,including immunodeficiency and autoimmune diseases,when lymphocyte development is altered.

关键词： diseases lymphocytes pathogenesis

A Delay-dependent Dynamic Wide Area Damping Controller for Renewable Energy Integrated Power System Resilient to Communication Failure

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CSEE Journal of Power and Energy Systems 2023年第2期9卷 577-588页

作者： Anirban sengupta Dushmanta Kumar Das Bidyadhar Subudhi Department of Electrical and Electronics Engineering Sikkim Manipal Institute of TechnologySMUSIkkim737136 India Department of Electrical and Electronics Engineering National Institute of TechnologyNagalandDimapur797103 India School of Electrical Science Indian Institute of TechnologyGoaIndia

Integration of renewable energy sources(RES)with a conventional power system has a detrimental effect on interarea *** popular RESs are solar photovoltaic(PV)and wind energy conversion systems(WECS).Both solar PV power generation and WECS are integrated with power systems using a power electronic *** the amount of RES generation lead towards reduction of system damping,which leads towards inter-area ***,the intermittent behavior of a RES reduces the effectiveness of damping controllers.A dynamic controller based wide area damping controller(WADC)is proposed in this paper to increase small signal stability of a RES integrated power *** WADC is designed for contemplating delay in a communication channel,communication failure and *** anti-windup compensator is developed to overcome the effect of actuator ***,the gain of the anti-windup compensator is calculated using LyapunovKrasovskii functional(LKF)in terms of linear matrix inequality(LMI).The actuator considered in this paper is a unified power flow controller(UPFC).Efficacy of PV and wind power integration on power system is also *** efficacy of the developed dynamic controller is verified using IEEE 39 bus and 68 bus power system.

关键词： Actuator saturation communication failure linear matrix inequality renewable energy sources time delay wide area damping control

Colon Structure of Associated Primes of Monomial Ideals

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Algebra Colloquium 2024年第3期31卷 441-450页

作者： Siddhi Balu Ambhore Indranath sengupta Discipline of Mathematics IIT GandhinagarPalajGandhinagarGujarat 382355India

We find an explicit expression of the associated primes of monomial ideals as a colon by an element,using the unique irredundant irreducible decomposition whose irreducible components are monomial *** algorithm to compute is given using *** squarefree monomial ideals the problem is related to the combinatorics of the underlying clutter or *** ideals of Borel type,the monomial u takes a simpler form,and we classify when is unique.

关键词： monomial ideals associated primes colon ideals

Provenance studies on the heavy mineral placers along the coastal deposits of Odisha,eastern India

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Journal of Palaeogeography 2022年第2期11卷 275-285页

作者： Shayantani Ghosal Sudha Agrahari Debashish sengupta Department of Geology and Geophysics Indian Institute of Technology KharagpurWest BengalIndia Department of Applied Geology Indian Institute of Technology(Indian School of Mines)DhanbadJharkhandIndia

The coastal deposits along the eastern part of the Indian Peninsula are known for the high abundance of heavy minerals. The present study, as discussed here, has been undertaken along the southwestern coastal part of Odisha, India, adjoining the charnockite-migmatite zone of the Eastern Ghat Mobile Belt(EGMB). The composition of the placers along the study area is primarily controlled by the detritus from the proximal hinterland rock type(s). The weathering index has been established based on the grain morphology, major element concentration and radioelement ratios. Petrological characteristics and grain morphology of monazite, zircon, ilmenite and rutile have been presented respectively, and their implications are discussed. The provenance study of these coastal placers is based on the abundance of rare earth elements(REE) and radioactive elements in the placer sands and the rock types in the study area. The tectonic implications are based on the major element abundance of the beach sands.

关键词： Monazite placers High background radiation area(HBRA) Eastern Ghat Mobile Belt(EGMB) Weathering Zircon Rare earth elements(REE) East coast of India