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A geospatial investigation of interlinkage between basement fault architecture and coastal aquifer hydrogeochemistry

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Geoscience Frontiers 2020年第4期11卷 1431-1440页

作者： p.p.Das p.p.mohapatra S.Goswami m.mishra J.K.pattanaik ACOAST Amity University HarayanaGurugramIndia Department of Geology North Odisha UniversityOdishaIndia Department of Earth Sciences Sambalpur UniversitySamabalpurOdishaIndia Khallikote University BerhampurOdishaIndia Centre for Geography and Geology Central University of PunjabBhatindaIndia

The mahanadi delta,deposited on a series of horst and graben basement structures,is considered an extension of the East Lambert Rift of *** study is based on the hydrogeochemical assessment of this deltaic aquifer system and geospatial analysis thereof,to appreciate the basement structure influence on groundwater *** ion chemistry of subsurface waters portrays a distinct saline contamination across the terrain and varied regimes of water types,specifically with respect to southern and northern parts of this aquifer *** of the study indicate a general near surface saline horizon and significant fragmentation of the hydrostatic ***,in turn,implies noteworthy influence of formational water to salinity regimes and basin structural changes for the escape of these waters to surroundings.A plot of recent low intensity earthquakes displays proximity of epicenters to the faults as well as striking similarity to the trend of terrestrial faults indicating multiple reactivations of the *** further corroborate the above findings,spatial pattern analysis of individual hydrochemical variables is carried out which reveals specific clusters of sources(groundwater mixing)and sinks(groundwater dispersion) in proximity to basement fault *** the faults can be disregarded as conduits or barriers owing to their great depth,the overlying sedimentary mass,particularly,the horizons with significant clayey content have been distorted due to post rift subsidence and fault reactivations.A proximity analysis of ionic clusters points towards a greater influence of longitudinal faults to that of the transverse ones on groundwater mixing or dispersion.

关键词： Hydrogeochemistry mahanadi Geospatial Salinity Cluster analysis

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Biophysical interactions between silver nanoparticle-albumin interface and curcumin

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Journal of pharmaceutical Analysis 2020年第2期10卷 164-177页

作者： Vinod D.Jaiswal p.m.Dongre Department of Biophysics University of MumbaiVidyanagariSantacruzMumbai400098India

Active targeted drug delivery methods facilitate effective uptake of functionalized nanoparticles through receptor-mediated *** recent years,albumin-nanoparticle interaction has been critically examined so that this functionalized nanoparticle can be efficiently loaded with *** present investigation aims at understanding the adsorption of Bovine Serum Albumin(BSA)on Silver Nano-particle(SNp)surface,preparation of soft conjugates(SC)and hard conjugates(HC)of BSA-functionalized SNp(SNp-BSA),and their interaction with curcumin(CUR).HC contains tightly bound BSA whereas SC involves tightly and loosely bound *** in the hydrodynamic radii of conjugates was observed upon SNp incubation with increased concentration of *** different SNp-BSA conjugate ratios were selected to study their interaction with *** spectroscopy showed a strong association between CUR and SNp:BSA ***,binding varied with a change in the conjugate *** Dichroism(CD)/Fourier Transform Infrared(FTIR)spectroscopy revealed the alterations in the secondary structure of BSA upon CUR binding to the *** potential data indicated stable conjugate *** in SNp:BSA conjugate was found to have a higher half-life as compared to the *** believe that this is the first biophysical characterization report of conjugates that can be effectively extrapolated for targeted drug delivery.

关键词： CUR Bovine serum albumin Silver nanoparticles Soft conjugates Hard conjugates Spectroscopy

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A Criterion for the Change from Fast to Slow Regime of Cementite Dissolution in Fe-C-mn Steels

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Journal of materials Science & Technology 2012年第8期28卷 728-736页

作者： m.Gouné p.maugis J.Drillet Arcelor mittal Research maizières Voie RomaineBP 30320Maizières-lès-Metz 57283France ICmCB-CNRS 87 avenue du Docteur SchweitzerPessac 33609France Im2Np-UmR CNRS 6242&Aix-marseille University Avenue Escadrille Normandie Niemen-Case 142-13397 Marseille Cedex 20France

The present study clarifies the role of mn in cementite on the driving force of cementite dissolution and the growth of austenite. From an experimental study, the effects of manganese composition and temperature on the cementite dissolution were shown. From a theoretical analysis based on thermodynamic and kinetics considerations, a criterion for the change from fast to slow regime of cementite dissolution was proposed. This criterion is in good agreement with the experimental results. It can be easily calculated and can define the composition and temperature ranges where the cernentite dissolution is slow or fast.

关键词： phase transformation Thermodynamics Kinetics Cementite dissolution Steel

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A cavitation aggressiveness index within the Reynolds averaged Navier Stokes methodology for cavitating flows

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Journal of Hydrodynamics 2015年第4期27卷 579-586页

作者： KOUKOUVINIS p. BERGELES G. GAVAISES m. Department of Engineering and mathematical Science City University London

The paper proposes a methodology within the Reynolds averaged Navier Stokes（RANS） solvers for cavitating flows capable of predicting the flow regions of bubble collapse and the potential aggressiveness to material damage. An aggressiveness index is introduced, called cavitation aggressiveness index（CAI） based on the total derivative of pressure which identifies surface areas exposed to bubble collapses, the index is tested in two known cases documented in the open literature and seems to identify regions of potential cavitation damage.

关键词： cavitation aggressiveness index(CAI) cavitation erosion multiphase cavitating flows

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Seismic fragility of structures isolated by single concave sliding devices for different soil conditions

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Earthquake Engineering and Engineering Vibration 2018年第4期17卷 869-891页

作者： p.Castaldo G.Amendola m.Ripani Department of Structural Geotechnical and Building Engineering (DISEG) Politecnico di Torino Turin Italy Department of Civil Engineering University of Salerno Via Giovanni Paolo H (SA) ltaly Universidad de Buenos Aires. Consejo Nacional de lnvestigaciones Cientificas y Tecnicas ( CONICET). Instituto de Tecnologias y Cieneias de la Ingenieria "Hilario Fernandez Long" (INTECIN). Faeultad de Ingenieria Buenos Aires Argentina

This study deals with the seismic fragility of elastic structural systems equipped with single concave sliding（friction pendulum system（FpS）） isolators considering different soil conditions. The behavior of these systems is analyzed by employing a two-degree-of-freedom model, whereas the FpS response is described by means of a velocity-dependent model. The uncertainty in the seismic inputs is taken into account by considering artificial seismic excitations modelled as timemodulated filtered Gaussian white noise random processes of different intensity within the power spectral density method. In particular, the filter parameters, which control the frequency content of the random excitations, are calibrated to describe stiff, medium and soft soil conditions. The sliding friction coefficient at large velocity is also considered as a random variable modelled through a uniform probability density function. Incremental dynamic analyses are developed in order to evaluate the probabilities of exceeding different limit states related to both the reinforced concrete（RC） superstructure and isolation level, defining the seismic fragility curves within an extensive parametric study carried out for different structural system properties and soil conditions. The abovementioned seismic fragility curves are useful to evaluate the seismic reliability of base-isolated elastic systems equipped with FpS and located in any site for any soil condition.

关键词： friction pendulum devices seismic isolation soil condition frequency content seismic fragility

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Experimental Investigation of Flow Instabilities in a Laminar Separation Bubble

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Journal of Thermal Science 2014年第3期23卷 203-214页

作者： Simoni D. Ubaldi m. Zunino p. DImE-Università di GenovaVia montallegro 1 I-16145 Genova Italy DImE-Università di Genova Via Montallegro 1 I-16145 Genova Italy

The present paper reports the results of a detailed experimental study aimed at investigating the dynamics of a laminar separation bubble, from the origin of separation up to the breakdown to turbulence of the large scale co- herent structures generated as a consequence of the Kelvin-Helmholtz instability process. measurements have been performed along a fiat plate installed within a double contoured test section, designed to produce an adverse pressure gradient typical of Ultra-High-Lift turbine blade profiles, which induces the formation of a laminar separation bubble at low Reynolds number condition. measurements have been carried out by means of comple- mentary techniques： hot-wire （HW） anemometry, Laser Doppler Velocirnetry （LDV） and particle Image Veloci- metry （pIV）. The high accuracy 2-dimensional LDV results allow investigating reverse flow magnitude and both Reynolds normal and shear stress distributions along the separated flow region, while the high frequency response of the HW anemometer allows analyzing the amplification process of flow oscillations induced by instability mechanisms. pIV results complement the flow field analysis providing information on the generation and evolu- tion of the large scale coherent structures shed as a consequence of the separated shear layer roll-up, through in- stantaneous velocity vector maps. The simultaneous analysis of the data obtained by means of the different meas- uring techniques allows an in depth view of the instability mechanisms involved in the transition/reattachrnent processes of the separated shear layer.

关键词： Ultra-High-Lift turbine profiles separated flow transition mode streaks Kelvin-Helmholtz instabil- ity linear stability theory

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COmpOSITION AND RHEOLOGY OF pOLYAmIDE-6 OBTAINED BY USING BI-AND TRI-FUNCTIONAL COUpLING AGENTS

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Chinese Journal of polymer Science 2013年第1期31卷 58-70页

作者： J.J.m. Slot E. van Ruymbeke p.A.m. Steeman materials Science Centre DSM Research Department of mathematics and Computer Science Eindhoven University of Technology

A statistical approach is developed, based on a monte Carlo method, in order to determine the statistical composition of a polyamide-6 sample composed of caprolactam （an AB-type monomer） and of a di-acid （A2 type） or a tri- acid （A3 type） as coupling agents. For this composition, the linear theological behavior of these systems is predicted using a tube-based theory. This allows us to show that while coupling agents of type A2 can be seen as flow improver, the effect of branching agents of type A3, depending on the synthesis recipe and the conversion level, can lead either to an increase or to a decrease of the viscosity. By adding specific amount of these agents, we also show that it is possible to obtain materials with the same zero-shear viscosity but with different shear thinning behavior. Furthermore, the polydispersity of linear samples of the same average number molecular weight, mn, is discussed in function of the amount of A2 monomers they contain. Ranging from 2 to 1.5, this difference in polydispersity is expected to have a significant influence on the processing behavior of such materials.

关键词： polyamide-6 Random branching Statistical composition Rheology monte Carlo Tube theory.

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Effect of Streamwise Fences on Secondary Flows and Losses in a Twodimensional Turbine Rotor Cascade

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Journal of Thermal Science 2006年第4期15卷 296-305页

作者： m.Govardhan A.Rajender J.p.Umang Thermal Turbomachines Laboratory Department of Mechanical EngineeringIndian Institute of Technology MadrasChennai 600036India

To control secondary flows, streamwise fences were attached to end wall of a linear turbine rotor cascade. The cascade had 8 blades of 400 mm long and 175 mm chord. The blades deflected the flow by 120°. The fences were made out of 0.7 mm thick brass sheet and the heights of the fences were 14 mm, 18 mm respectively. The curvature of the fences was the same as that of the blade camber line. The fences were fixed normal to the end wall and at half pitch away from the blades. The experimental program consists of total pressure, static pressure measurements at the inlet and outlet of the cascade, by using five-hole probe. In addition, static pressure on the blade suction surface and pressure surface was also obtained. Fences are effective in preventing the movement of the pressure side leg of the horseshoe vortex. Consequently the accumulation of low energy fluid on the suction surface is minimised. End wall losses are reduced by the fences due to weakening of the end wall cross flow.

关键词： Turbine cascade streamwise fences loss core lift coefficient

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The effect of Fe doping on structural and magnetic properties of nanocrystallite Co_2Cr_(1-x)Fe_xAl Heusler alloys prepared by mechanical alloying

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Chinese physics B 2012年第11期21卷 459-466页

作者： m.Hakimi p.Kameli H.Salamati Department of physics Isfahan University of Technology

mechanical alloying has been used to produce nanocrystallite Co2Crl-xFexAl （x = 0, 0.4, 0.6, 1） Heusler alloys. The formation of the L21 phase of Co2Cr1-xFexAl by the mechanical alloying method was investigated. The effect of Fe doping on the structural and magnetic properties of the samples was also studied. The results were compared with the Slater pauling prediction. A comparison between these samples and those prepared by the arc-melting method in the literature was made. An increase of the coercivity Hc with the increasing Fe doping level was observed. This phenomenon was explained by the increases of lattice strain and magnetic anisotropy with the increasing Fe content.

关键词： magnetic property X-ray diffraction nanocrystallite mechanical property

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Self-collimation in photonic crystals with anisotropic constituents

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Chinese Optics Letters 2007年第9期5卷 527-530页

作者： J.W.Haus m.Siraj p.prasad p.markowicz Electro-Optics program University of DaytonDaytonOH 45469-0245 State University of New York at Buffalo Institute for LasersPhotonics and BiophotonicsBuffaloNY 14260-3000

In a photonic crystal composed of anisotropic constituents we quantify the range of input angles and the degree of collimation of the beam inside the crystal. The optical properties of a photobleached 4- dimethylamino-N-methyl-4-stilbazolium-tosylate （DAST） crystal are used in our model to demonstrate the efficacy of the self-collimation features.

关键词： Self-collimation in photonic crystals with anisotropic constituents

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