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A novel approach to correlate heat transfer and pressure fluctuation in gas-solid spouted bed

particuology 2019年第1期17卷 26-34页

作者： p.K. Mollick p.S. Goswamib M. Krishnana p.K. Vijayanc A.b. panditd Mechanical Metallurgy Division Bhabha Atomic Research CentreMumbai 400085India Deptartmenr of Chemical Engineering Indian Institute ofTechnology-BombayMumbai 400076India Reactor Engineering Division Bhabha Atomic Research CentreMumbai 400085India Deptartment of Chemical Engineering Institute of Chemical TechnologyMumbai 400019India

Statistical analysis of pressure fluctuations in spouted beds has been used as a well-established diagnostic tool to determine bed and flow characteristics because of its smooth operation. However, in many recent and conventional applications of spouted beds such as drying, coal gasification, catalytic conversion, biomass treatment, and chemical vapor deposition, direct estimation of the heat transfer rate from the solid bed to the gas or vice versa has proven to be difficult. A variance and spectral analysis of pressure fluctuation is extended here to characterize the heat transfer phenomena in a spouted bed. In the present study, zirconia and alumina were used as the bed materials, and argon and nitrogen were used as the spouting gases. Experiments were conducted at various heating rates for different superficial gas velocities for a range of temperatures up to 300 °C. Significant changes in the gas density and viscosity with different extents of heat transfer were observed to affect the momentum diffusivity and gas–particle interaction, which in turn led to local pressure fluctuations, causing the bed to behave differently. In the present work, a novel approach is proposed to establish a link between local pressure fluctuation and the extent of heat transfer in the bed. This method shows potential for correlation of the statistics of pressure fluctuation with the thermal properties of individual solids and gases. Thus, the technique can be extended to many industrial applications for the indirect estimation of the extent of heat transfer and prediction of unknown thermal properties of products in solids or gases.

关键词： Spouted bed Heat transfer pressure fluctuation Statistical analysis power spectral density analysis Thermal properties

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Influence of Annealing on physical properties of CdO Thin Films prepared by SILAR Method

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Journal of Materials Science & Technology 2013年第1期29卷 17-21页

作者： b.Gokul p.Matheswaran R.Sathyamoorthy pG and Research Department of physics Kongunadu Arts and Science College (Autonomous)

Cadmium oxide （CdO） thin films were prepared by successive ionic layer adsorption and reaction （SILAR） method and annealed at 250-450 ℃ for 2 h. The prepared films were characterized by X-ray diffraction （XRD）, optical spectroscopy, scanning electron microscopy （SEM） and Hall effect measurement. The XRD analysis reveals that the films were polycrystalline with cubic structure. both crystallinity and the grain size were found to increase with increasing annealing temperature. SEM analysis shows the porous nature of the surface with spherical nanoclusters. Energy dispersive spectroscopic analysis （EDS） confirmed the presence of Cd and O elements without any additional impurities. The films exhibited maximum transmittance （82%-86%） in infra-red （IR） region. Transmittance was found to decrease with increasing annealing temperature （Eg） was in the range of 2.24-2.44 eV. Hall effect measurement shows an and the estimated band gap energy ncrease in carrier concentration and a decrease in resistivity with increasing annealing temperature. The carrier concentration （N） and resistivity （p） of about 1.26 × 1022 cm-3 and 8.71 × 10 3 Ω cm are achieved for the film annealed at 450 ℃ for 2 h.

关键词： Annealing porous structure Hall effect Electrical resistivity

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performance analysis of new word weighting procedures for opinion mining

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Frontiers of Information Technology & Electronic Engineering 2016年第11期17卷 1186-1198页

作者： G.R.bRINDHA p.SWAMINATHAN b.SANTHI School of Computing SASTRA University

The proliferation of forums and blogs leads to challenges and opportunities for processing large amounts of information. The information shared on various topics often contains opinionated words which are qualitative in nature. These qualitative words need statistical computations to convert them into useful quantitative data. This data should be processed properly since it expresses opinions. Each of these opinion bearing words differs based on the significant meaning it conveys. To process the linguistic meaning of words into data and to enhance opinion mining analysis, we propose a novel weighting scheme, referred to as inferred word weighting(IWW). IWW is computed based on the significance of the word in the document(SWD) and the significance of the word in the expression(SWE) to enhance their performance. The proposed weighting methods give an analytic view and provide appropriate weights to the words compared to existing methods. In addition to the new weighting methods, another type of checking is done on the performance of text classification by including stop-words. Generally, stop-words are removed in text processing. When this new concept of including stop-words is applied to the proposed and existing weighting methods, two facts are observed:(1) Classification performance is enhanced;(2) The outcome difference between inclusion and exclusion of stop-words is smaller in the proposed methods, and larger in existing methods. The inferences provided by these observations are discussed. Experimental results of the benchmark data sets show the potential enhancement in terms of classification accuracy.

关键词： Inferred word weight Opinion mining Supervised classification Support vector machine(SVM) Machine learning

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塑性理论

塑性理论

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1965年

作者：（英）约翰逊 W.（英）梅乐 p.b. 王则明译

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A new thermodynamically stable Nb_(2)Ni intermetallic compound phase revealed by peritectoid transition within binary Nb-Ni alloy system

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Journal of Materials Science & Technology 2022年第5期100卷 246-253页

作者： J.F.Zhao H.p.Wang b.Wei School of physical Science and Technology Northwestern Polytechnical UniversityXi’an 710072China

A new intermetallic compound of thermodynamically stable Nb_(2)Ni phase is discovered within Nb-Ni binary system,refreshing the current situation that there are only three stable intermediate phases of Nb_(7)Ni_(6),NbNi_(3) and NbNi_(8).The new stable phase is generated from the peritectoid transition:(Nb)+Nb_(7)Ni_(6)→Nb_(2)Ni,and the transformation temperature is 1533 *** refreshes the current equilibrium Nb-Ni binary phase *** is confirmed by transmission electron microscopy and the annealing experiments,which is determined to be the FCC structure(pearson:cF96,space grope:Fd-3m O2,a=11.888A).Furthermore,the equilibrium properties of Nb_(2)Ni phase are produced by density functional theory,including the formation energy,cohesive energy,bulk modulus and lattice constant.

关键词： Intermetallic compound peritectoid transition Transmission electron microscopy Density functional theory Nb alloy

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Stochastic Energy Management of Microgrid with Nodal pricing

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Journal of Modern power Systems and Clean Energy 2020年第1期8卷 102-110页

作者： Dhanapala prudhviraj p.b.S.Kiran Naran M.pindoriya IEEE Department of Electrical Engineering Indian Institute of Technology GandhinagarPalaj 382355GandhinagarIndia

This paper develops a stochastic framework for the energy management of a microgrid to minimize the energy cost from the *** considers the uncertainties in solar photovoltaic(pV)generation,load demand,and electricity ***,the opportunity of flexible load demand,i.e.,the effect of demand response(DR),on the test system is *** uncertainties are modeled by using Monte Carlo simulations and the generated scenarios are reduced to improve the computational *** general,microgrid scheduling is implemented by using substation(source node)price as a reference,but that reference price is not the same at all ***,this paper develops the nodal price based energy management in a microgrid to improve the scheduling *** stochastic energy management framework is formulated as a mixed integer non-linear programming(MINLp).Four case studies are simulated for a modified 15-node radial distribution network integrated with solar pV and battery energy storage system(bESS)to validate the effectiveness of the energy management framework for a microgrid with nodal pricing.

关键词： battery energy storage system(bESS) demand response(DR) distributed generation microgrid mixed integer non-linear programming(MINLp) scheduling stochastic optimization

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Anisotropic strange quark star in Finch-Skea geometry and its maximum mass for non-zero strange quark mass(m_(s)≠0)

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Chinese physics C 2023年第5期47卷 195-210页

作者： b.Das K.b.Goswami A.Saha p.K.Chattopadhyay Department of physics Coochbehar Panchanan Barma UniversityVivekananda StreetCoochbehar 736101West BengalIndia Department of physics Alipurduar CollegeAlipurduar 736122West BengalIndia

A class of relativistic astrophysical compact objects is analyzed in the modified Finch-Skea geometry described by the MIT bag model equation of state of interior matter,p=1/3(ρ-4b),where b is known as the bag constant.b plays an important role in determining the physical features and structure of strange *** consider the finite mass of the strange quark(m_(s)≠0) and study its effects on the stability of quark matter inside a *** note that the inclusion of strange quark mass affects the gross properties of the stellar configuration,such as maximum mass,surface red-shift,and the radius of strange quark *** apply our model physically,we consider three compact objects,namely,(ⅰ) VELA X-1,(ⅱ) 4U 1820-30,and(ⅲ) pSR J 1903+327,which are thought to be strange *** range of b is restricted from 57.55 to bstable(MeV/fm3),for which strange matter might be stable relative to iron(^(56)Fe).However,we also observe that metastable and unstable strange matter depend on b and *** energy conditions hold well in this *** in terms of the Lagrangian perturbation of radial pressure is studied in this paper.

关键词： compact star strange star anisotropy MIT EoS strange quark mass

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Capacitance of High-Voltage Coaxial Cable in plasma Immersion Ion Implantation

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Journal of Materials Science & Technology 2001年第1期17卷 41-42页

作者： X.b.Tian L.p.Wang D.T.K.Kwok b.Y Tang p.K.Chu Department of physics&Materials Science City University of Hong KongHong KongChina

plasma immersion ion implantation (pIII) is an excellent technique for the surf see modification of complex-shaped components. Owing to pulsed operation mode of the high voltage and large slew rate, the capacitance on the high-voltage coaxial cable can be detrimental to the process and cannot be ignored. In fact, a significant portion of the rise-time/fall-time of the implantation voltage pulse and big initial current can be attributed to the coaxial cable.

关键词： surface modification ion implantation high voltage mode of

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Maximum mass of anisotropic charged strange quark stars in a higher dimensional approach(D≥4)

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Chinese physics C 2023年第1期47卷 271-292页

作者： A.Saha K.b.Goswamiy b.Dasz p.K.Chattopadhyayx Department of physics Alipurduar CollegeAlipurduarWest Bengal 736122India Department of physics Coochbehar Panchanan Barma UniversityWest Bengal 736101India

In this article,a new class of solutions of Einstein-Maxwell field equations of relativistic strange quark stars obtained in dimensions D≥4,is *** assume that the geometry of space-time is pseudo-spheroid,embedded in Euclidean space of(D-1)*** MIT bag model equation of state(henceforth EoS)is employed to study the relevant properties of strange quark *** the causal and non-negative nature of the square of the radial sound velocity(vr2),we observe that some restrictions exist on the reduced radius(b/R),where R is a parameter related to the curvature of the space-time,and b is the radius of the *** spheroidal parameter A used here defines the metric potential of the grrcomponent,which is pseudo-spheroidal in *** note that the pressure anisotropy and charge have some effects onλ.The maximum mass for a given surface density(ρs)or bag constant(b)assumes a maximum value in dimension D=5and decreases for other values of *** generalized buchdahl limit for a higher dimensional charged star is also obeyed in this *** observe that in this model,we can predict the mass of a strange quark star using a suitable value of the electric charge(Q)and bag constant(b).Energy and stability conditions are also satisfied in this *** is also studied considering the dependence of the Lagrangian perturbation of radial pressure(Δpr)on the frequency of normal modes of *** tidal Love number and tidal de-formability are also evaluated.

关键词： strange star MIT bag model Einstein-Maxwell equations higher Dimension

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储藏对小米粉中蛋白质质量的影响

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粮食加工 1987年第4期 50-52页

作者： p.b. 石金柱

将两个品种的小米全粉放于容器中,于室温下（25±5℃）下存放8天,直至米粉失去其风味且口感很差。然后测定一下米粉样品中蛋白质的品质,从而可知蛋白质含量、实际可消化利用率、生物学效价、净留存的蛋白质含量,并可了解到蛋白质的可利... 详细信息

将两个品种的小米全粉放于容器中,于室温下（25±5℃）下存放8天,直至米粉失去其风味且口感很差。然后测定一下米粉样品中蛋白质的品质,从而可知蛋白质含量、实际可消化利用率、生物学效价、净留存的蛋白质含量,并可了解到蛋白质的可利用率在储藏过程中有明显的下降。含油量较高的品种,蛋白质的品质受到的影响较严重。

关键词：小米粉 HC 食物蛋白质小白鼠质量

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