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An Investigation on Rotating bending Fatigue behavior of nanostructured Low-Temperature bainitic Steel

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Acta Metallurgica Sinica(English Letters) 2014年第2期27卷 233-238页

作者： b.R.Shendy M.n.Yoozbashi b.Avishan S.Yazdani Faculty of Materials Engineering Sahand University of Technology University of Applied Science and Technology Faculty of Engineering Azarbaijan Shahid Madani University

The aim of this work is to investigate the fatigue behavior of a new class of nanostructured, low-temperature bainitic steels, where rotating bending fatigue tests were conducted on samples isothermally transformed at 300, 250, and 200 ℃, after which, fracture surfaces were examined using scanning electron microscopy. Results showed that, fatigue limits of about 820, 945, and 1,005 MPa were achieved for the samples transformed at each transformation temperature, respectively. Moreover, according to the SEM micrographs, secondary crack initiation was observed in the high carbon retained austenite blocks for samples transformed at 300 ℃ and at the interface of blocky austenite-bainitic ferrite for samples transformed at 250 and 200 ℃.

关键词： Fatigue bainitic ferrite Retained austenite Fractography

Transmission FTIR derivative spectroscopy for estimation of furosemide in raw material and tablet dosage form

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Acta Pharmaceutica Sinica b 2014年第5期4卷 376-383页

作者： Máximo Gallignani Rebeca A.Rondón JoséF.Ovalles maría R.brunetto Laboratorio de Espectroscopia Molecular Departamento de QuímicaFacultad de CienciasUniversidad de Los AndesMérida 5101-AVenezuela Departamento de Análisis y Control Facultad de Farmacia y BioanálisisUniversidad de Los AndesMérida 5101-AVenezuela

A Fourier transform infrared derivative spectroscopy(FTIR-DS)method has been developed for determining furosemide(FUR)in pharmaceutical solid dosage *** method involves the extraction of FUR from tablets with n,n-dimethylformamide by sonication and direct measurement in liquid phase mode using a reduced path length *** general,the spectra were measured in transmission mode and the equipment was configured to collect a spectrum at 4 cm^(-1) resolution and a 13 s collection time(10 scans co-added).The spectra were collected between 1400 cm^(-1) and 450 cm^(-1).Derivative spectroscopy was used for data processing and quantitative measurement using the peak area of the second order spectrum of the major spectral band found at 1165 cm^(-1)(SO_(2) stretching of FUR)with baseline *** method fulfilled most validation requirements in the 2 mg/mL and 20 mg/mL range,with a 0.9998 coefficient of determination obtained by simple calibration model,and a general coefficient of variation n recovery for the proposed assay method resulted within the(100±3)%over the 80%–120% range of the target *** results agree with a pharmacopoeial method and,therefore,could be considered interchangeable.

关键词： FTIR Derivative spectroscopy Furosemide Frusemide Pharmaceutical analysis

Estimation of jet grouting parameters in Shahriar dam,Iran

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Mining Science and Technology 2010年第3期20卷 472-477页

作者： nIKbAKHTAn b AHAnGARI K RAHMAnI n Department of Mining Engineering Science & Research BranchIslamic Azad UniversityTehran ***Iran Sahand University of Technology Tabriz ***Iran

Jet grouting is a method for improving of soil and its physical ***,in this method,grouting of cement slurry with high pressure and velocity may cause damaging to soil structure,and then excavated grains of soil are removed from the borehole and replaced with cement *** grains,which are remained around the borehole,mixed with slurry（cement） in-situ,can create an improved mass of *** mass is named＂Soilcrete＂.Soilcrete mass has special characteristics such as high strength,low deformability and very low *** this paper,principles of jet grouting and effective parameters have been *** the test results obtained from Soilcrete column have been ***,the paper concludes with presenting amount of principle jet grouting parameters at foundation of Shahriar dam according to the results of jet grouting *** on the measurements,the diameter,Soilcrete UCS（uniaxial compression strength）,amount of the water,grout and air pressure and lifting and rotating speed in original site of jet grouting are 1.2～1.5 m,2～3 MPa,370～390 bar,10～15 bar,6～8 bar,7～8 cm/min and 7～8 cm/min,*** it can be seen that while the column diameter falls within the upper half of the range,some values of the compressive strength are close to the lower limit of the range.

关键词： jet grouting ground improvement Soilcrete column Shahriar dam

Electrical properties of rare earth based tungsten bronze vanadates

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Journal of Rare Earths 2012年第11期30卷 1134-1137页

作者： b.b.Mohanty P.S.Sahoo R.n.P.Choudhary Department of Physics Betnoti College Betnoti Department of Physics ITER

barium based tungsten bronze （Tb） oxides having high dielectric constant and low loss, can be effectively used as transducers, actuators, capacitors and also in memory devices. All these characteristics stimulated the researchers to replace toxic and hazardous lead based materials by barium based Tb materials from industry. In the present research work, polycrystalline samples of baaSrRTi3VTO30 （R=Dy, Sm, La） were synthesized by a high temperature solid state reaction technique. Preliminary structural （X-ray diffraction） analyses of these com- pounds showed the formation of single-phase orthorhombic structures at room temperature having average crystallite size of the order of some nanometer for all the compounds. The scanning electron micrographs （SEM） provided information on the quality of the samples and showed more or less homogeneous distribution of grains over the entire surface of the samples. Detailed dielectric study in a wide temperature range （30-500 ℃） showed ferro to para phase transition for Dy and Sm substituted samples whereas no such transition was observed for La substituted samples. both the grain and grain boundary resistances exhibited negative temperature coefficient of resistance behavior much like semiconductors. The dc conductivity of all the compounds obeyed Arrhenius relation.

关键词： ceramics X-ray diffraction dielectric properties electrical conductivity rare earths

Quantum mechanical compact modeling of symmetric double-gate MOSFETs using variational approach

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Journal of Semiconductors 2012年第3期33卷 15-19页

作者： P.Vimala n.b.balamurugan Department of Electronics and Communication Engineering Thiagarajar College of EngineeringMadurai-625015TamilnaduIndia

A physics-based analytical model for symmetrically biased double-gate（DG） MOSFETs considering quantum mechanical effects is ***＇s and Poisson＇s equations are solved simultaneously using a variational *** the Poisson and Schrodinger equations simultaneously reveals quantum mechanical effects（QME） that influence the performance of DG *** inversion charge and electrical potential distributions perpendicular to the channel are expressed in closed *** systematically evaluated and analyzed the potentials and inversion charges,taking QME into consideration,in Si based double gate *** effect of silicon thickness variation in inversion-layer charge and potentials are quantitatively *** analytical solutions provide good physical insight into the quantization caused by quantum confinement under various gate biases.

关键词： quantum mechanical effects DG MOSFETs centroid electric potential inversion-layer charge

Modeling and simulation of nanoscale tri-gate MOSFETs including quantum effects

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Journal of Semiconductors 2014年第3期35卷 20-24页

作者： P.Vimala n.b.balamurugan Department of Electronics and Communication Engineering Thiagarajar College of Engineering

Quantum effects are predominant in tri-gate MOSFETs, so a model should be developed. For the first time, this paper presents the analytical model for quantization effects of thin film silicon tri-gate MOSFETs by using variational approach. An analytical expression of the inversion charge distribution function（ICDF） or wave function for the tri-gate MOSFETs has been obtained. This obtained ICDF is used to calculate the important device parameters, such as the inversion charge centroid and inversion charge density. The results are validated against with the simulation data.

关键词： device modeling energy quantization inversion charge density Poisson–Schrdinger equation trigate MOSFET

Modelling of sediment movement in the surf and swash zones

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Acta Oceanologica Sinica 2015年第2期34卷 137-142页

作者： TOKPOHOZIn n.b. KOUnOUHEWA b. AVOSSEVOU G.Y.H. HOUEKPOHEHAM A. AWAnOU C.n. Institut de Mathématiques et de Sciences Physiques (IMSP/UAC) Centre béninois de la Recherche Scientifique et Technique (CbRST) Laboratoire de Physique du Rayonnement (LPR/FAST-UAC)

Under the action of marine currents,non-cohesive sediments evolve by bed-load,by saltation or suspension depending on their *** authors have considered that the movement of sediment is bidimensional and modelized the effects of swell by a constant velocitynear the *** we have studied the velocity profile of fluctuating currents near the seabed and studied the movement of sediment in *** results show that in the areas of study（surf and swash）the movement of sediment occurs in a volume,and the evolution of sediment varies from an areato *** obtained theoretical profiles of the position and velocity vectors confirm the observations of several authors.

关键词： non-cohesive sediments sediment dynamics swell trajectory of sediment velocity drive

Antarctic red algae in dye-sensitized photoelectrochemical cells for water splitting

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Advances in Polar Science 2024年第2期35卷 219-227页

作者： Florentina ARISPE maría Fernanda CERDÁ Laboratorio de biomateriales IQBFacultad de CienciasUdelaRMontevideo 11400Uruguay

Phycoerythrin extracted from Antarctic red seaweeds shows promising characteristics to be applied as an anode sensitizer in water-splitting photoelectrochemical *** light irradiation and using an LED lamp,the red-colored protein shows an interesting ability to profit the incident light,as confirmed by the presence of oxygen bubbles next to the electrode surface without applying any external *** results showed that the addition of iodide is helpful to allow the regeneration of the dye;nevertheless,oxygen evolution is not *** analysis of the involved semi-reactions is also helpful to understand the observed *** exploration of Antarctic resources offers then an alternative for the development of green energies,with a particular focus on their use as sensitizers to profit from the sunlight in water-splitting as well as in photovoltaic devices.

关键词： sensitizers water-splitting red algae electrochemical

Computer-aided morphometry of liver inflammation in needle biopsies

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World Journal of Gastroenterology 2005年第44期11卷 6995-7000页

作者： n Dioguardi b Franceschini C Russo F Grizzi Scientific Direction

AIM: To introduce a computer-aided morphometric method for quantifying the necro-inflammatory phase in liver biopsy specimens using fractal geometry and Delaunay's ***: Two-micrometer thick biopsy sections taken from 78 chronic hepatitis C virus-infected patients were immunohistochemically treated to identify the inflammatory cells. An automatic computer-aided image analysis system was used to define the inflammatory cell network defined on the basis of Delaunay's triangulation,and the inflammatory cells were geometrically classified as forming a cluster (an aggregation of a minimum of three cells) or as being irregularly distributed within the tissue. The phase of inflammatory activity was estimated using Hurst's ***: The proposed automatic method was rapid and objective. It could not only provide rigorous results expressed by scalar numbers, but also allow the state of the whole organ to be represented by Hurst's exponent with an error of no more than 12%.COnCLUSIOn: The availability of rigorous metrical measures and the reasonable representativeness of the status of the organ as a whole raise the question as to whether the indication for hepatic biopsy should be revised by establishing clear rules concerning the contraindications suggested by its invasiveness and subjective interpretation.

关键词： biopsy Grading Image analysis Fractal geometry Topography Delaunay