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Lattice Boltzmann Simulation of a Gas-to-Solid Reaction and Precipitation Process in a Circular Tube

Computer Modeling in Engineering & Sciences 2018年第12期117卷 527-553页

作者： Matthew D.Lindemer Suresh G.Advani Ajay k.prasad Department of Mechanical and Industrial Engineering University of Minnesota Duluth1049 University DriveDuluthMN 55812USA Department of Mechanical Engineering University of DelawareNewarkDE 19716USA.

The lattice Boltzmann method(LBM)is used to simulate the growth of a solid-deposit on the walls of a circular tube resulting from a gas-to-solid reaction and precipitation *** process is of particular interest for the design of reactors for the production of hydrogen by the heterogeneous hydrolysis of steam with Zn vapor in the Zn/ZnO thermochemical *** solid deposit of ZnO product on the tube wall evolves in time according to the temporally-and axially-varying convective-diffusive transport and reaction of Zn vapor with steam on the solid *** LBM is wellsuited to solving problems with coupled flow,heat and mass transfer in a time-evolving ***,a D2Q9 axisymmetric multiple-relaxation-time(MRT)lattice Boltzmann scheme is used to simulate incompressible fluid transport while a D2Q5 axisymmetric MRT lattice Boltzmann scheme is used to simulate the convective-diffusive transport of Zn *** model is first validated against several analytical solutions,followed by a parametric study to understand the effect of Reynolds,Schmidt,and Damk?hler numbers on the time evolution of the ZnO deposition profile along the tube *** axial location of the fastest deposition is found to increase with increasing Peclet number,and decrease with increasing Damk?hler number,with no independent effect from the Schmidt *** the reaction kinetics are assumed to increase along the tube axis due to nonisothermal tube wall temperature,a second peak in the deposition profile can be observed for sufficiently low values of Da/Pe.

关键词： Lattice Boltzmann methods reactive flow heterogeneous reaction precipitation solar hydrogen production.

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Editorial

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Defence Technology（防务技术） 2015年第3期11卷 185-186页

作者： k.prasad Rao University of UTAH

Joining of materials is indeed an important aspect for both designers and *** reasons for joining are functional,structural and cost *** other technique is as widely used as welding to join materials efficiently and a... 详细信息

关键词：焊接材料编辑产品附加值机械连接制造商设计者钎焊粘接

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On the high temperature phase transition in Ba(Zr_(0.20)Ti_(0.80))O_(3) ceramic

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Journal of Advanced Dielectrics 2017年第4期7卷 22-28页

作者： k.P.Chandra A.R.kulkarni k.prasad Department of Physics S.M.College Bhagalpur 812001India Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Mumbai 400076India University Department of Physics T.M.Bhagalpur University Bhagalpur 812007India

Temperature dependent X-ray diffraction(XRD)and dielectric properties of perovskite Ba(Zr_(0.2)Ti_(0.8))O_(3) ceramic prepared using a standard solid-state reaction process is *** with phase transitions at low temperature,a new phase transition at high temperature(873℃ at 20 Hz),diffusive in character has been found where the lattice structure changes from monoclinic(space group:P2=m) to hexagonal(space group:P6=mmm).This result places present ceramic in the list of potential candidate for intended high temperature *** AC conductivity data followed hopping type charge conduction and supports jump relaxation *** experimental value of d_(33)=98 pC/N was *** dependence of polarization and strain on electric field at room temperature suggested that lead-free Ba(Zr_(0.2)Ti_(0.8))O_(3) is a promising material for electrostrictive applications.

关键词： Lead-free ceramic structure dielectric properties phase transition AC conductivity piezoelectric electrostriction

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Electrical and magnetic properties of 0-3 Ba(Fe_(1/2)Nb_(1/2))O_(3)/PVDF composites

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Journal of Advanced Dielectrics 2017年第6期7卷 1-11页

作者： Hars Ranjan Uttam k.Mahto k.P.Chandra A.R.kulkarni A.prasad k.prasad Aryabhatta Centre for Nanoscience and Nanotechnology Aryabhatta Knowledge University Patna 800001India Department of Physics S.M.CollegeBhagalpur 812001India Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Mumbai 400076India University Department of Physics T.M.Bhagalpur UniversityBhagalpur 812007India

Lead-free Ba(Fe_(1/2)Nb_(1/2))O_(3)/PVDF O_(3) composites were fabricated using *** technique.X-ray diffraction,scanning electron microscopy,dielectric,impedance,ac conductivity,magnetic force microscopy(MFM)and vibrating sample magne-tometer studies were undertaken to characterize the *** crstallite size of the Ba(Fe_(1/2)Nb_(1/2))O_(3) powder,estimated using Williamson-Hall approach,was found to be~42 *** fller particles of~0.5-1 pum were found to disperse in the polymer matrix of all the *** concentration dependent values of real and imaginary parts of complex permittivity showed increasing trend and were seen to follow Bruggeman and Furukawa *** data for ac conductivity exhibited negative temperature coeficient of resistance character of the test materials and were found to obey Jonscher's power *** correlated barier hopping model was found to explain satisfactorily the mechanism of charge transport occurring in the *** confirmed the presence of magnetic phases in the *** magnetization versus applied field curves indicated the possibility of magnetoelectric coupling in the ***,the present composites have shown themselves as potential multi-functional candidate materials for use in high density data storage applications.

关键词： Random composite medium dielectric properties magnetic properties effective permittivity magnetic force microscopy

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Electrical properties of 0-30.5(Ba_(0.7)Ca_(0.3))TiO_(3)-0.5Ba(Zr_(0.2)Ti_(0.8))O_(3)/PVDF nanocomposites

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Journal of Advanced Dielectrics 2018年第4期8卷 35-42页

作者： Bablu k.Pandey Amit kumar k.P.Chandra A.R kulkarni S.k Jayaswal k.prasad University Department of Physics T.M.Bhagalpur University Bhagalpur 812007 India Department of Mechanical Engineering Birla Institute of Technology Mesra(Patna Campus) Patna 800014India Department of Physics S.M.College Bhagalpur 812001India Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Mumbai 400076 India

Lead-free x(0.50(Ba_(0.7)Ca_(0.3)TiO_(3)-0.50Ba(Zr_(0.2)Ti_(0.8)O_(3)-(1-x)PVDF ceramic–polymer nanocomposites with x=0.025,0.05,0.10,0.15,0.20,0.25 were prepared using melt-mixing *** distribution of nanoceramic filler particles(0.50(Ba_(0.7)Ca_(0.3)TiO_(3)-0.50Ba(Zr_(0.2)Ti_(0.8)O_(3)in the PVDF matrix were examined using scanning electron *** analysis indicated the negative temperature coefficient of resistance character of all the test *** concentrationdependent piezoelectric coefficient(d33Þdata followed exponential growth types of *** data for ac conductivity were found to obey Jonscher’s power *** correlated barrier hopping(CBH)model was found to explain the mechanism of charge transport occurring in the *** low value of loss tangent(-10^(-2))along with the high value of d_(33) foreshadowing the prospect of present nanocomposite is a better nonlead option for piezo-sensing/detection applications,especially in bio-medical area.

关键词： Random composite medium dielectric properties piezoelectric properties impedance analysis.

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“病理影像化”:基于组织学特征的磁共振成像在体识别心肌纤维化

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Science Bulletin 2023年第9期68卷 864-867页

作者：陆敏杰朱乐怡 Sanjay k.prasad 赵世华 Department of Magnetic Resonance Imaging Fuwai HospitalState Key Laboratory of Cardiovascular DiseaseChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100037China key Laboratory of Cardiovascular Imaging(Cultivation) Chinese Academy of Medical SciencesBeijing 100037China Cardiovascular Magnetic Resonance Unit Royal Brompton HospitalLondon SW36NPUK National Heart&Lung Institute Imperial CollegeLondon W21PGUK

Myocardial fibrosis,characterized by the excessive deposition of extracellular matrix proteins,is an important underlying mechanism for adverse outcomes in many cardiovascular diseases[1].Multiple modalities have been developed to identify and quantify myocardial fibrosis *** magnetic resonance(CMR)imaging provides the gold standard for the assessment of cardiac structure and function.

关键词：磁共振成像心肌纤维化组织学特征影像化

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“病理影像化”:基于组织学特征的磁共振成像在体识别心肌纤维化（英文）

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Science Bulletin 2023年第9期 864-867页

作者：陆敏杰朱乐怡 Sanjay k.prasad 赵世华 Department of Magnetic Resonance Imaging Fuwai Hospital State Key Laboratory of Cardiovascular Disease Chinese Academy of Medical Sciences and Peking Union Medical College key Laboratory of Cardiovascular Imaging (Cultivation) Chinese Academy of Medical Sciences Cardiovascular Magnetic Resonance Unit Royal Brompton Hospital National Heart & Lung Institute Imperial College

Myocardial fibrosis, characterized by the excessive deposition of extracellular matrix proteins, is an important underlying mechanism for adverse outcomes in many cardiovascular diseases [1].Multiple modalities have been developed to identify and quantify myocardial fibrosis non-invasively. Cardiac magnetic resonance(CMR) imaging provides the gold standard for the assessment of cardiac structure and function.

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Histopathological study of chronic wounds modulated by intermittent negative pressure therapy under limited access dressing

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Plastic and Aesthetic Research 2015年第1期2卷 272-276页

作者： Thittamaranahalli Muguregowda Honnegowda Pramod kumar Rekha Singh Swarna Shivakumar Pragna Rao Hemanth k.prasad Sudesh kumar Udaya kumar Echalasara Govindarama Padmanabha Udupa Department of Plastic Surgery and Burns Kasturba Medical CollegeManipal 576104KarnatakaIndia Department of Plastic Surgery King Abdulaziz Specialist HospitalSakaka 42421Al-JoufSaudi Arabia Department of Pathology Vydehi Institute of Medical Sciences and Research CenterBengaluru 560066KarnatakaIndia Department of Pathology Apollo HospitalsBengaluru 560066KarnatakaIndia Department of Biochemistry Kasturba Medical CollegeManipal 576104KarnatakaIndia Department of Surgery Government District HospitalUdupi 576101KarnatakaIndia

Aim:Negative pressure wound therapy(NPWT)has achieved widespread success in the treatment of chronic ***,its effects have been only partially explored,and investigations have generally concentrated on the wound-dressing interface;a detailed histopathological description of the evolution of wounds under NPWT is still *** present study was performed to investigate the effect of a limited access dressing(LAD)which exerts intermittent NPWT in a moist environment on chronic ***:A total of 140 patients were randomized into 2 groups:LAD group(n=64)and conventional dressing group(n=76).By histopathological analysis of the granulation tissue,the amount of inflammatory infiltrate,necrotic tissue,angiogenesis,and extracellular matrix(ECM)deposition was studied and compared to determine healing between the 2 ***:After 10 days of treatment,histopathological analysis showed a significant decrease in necrotic tissue with LAD compared to the conventional dressing group(mean±standard error,11.5±0.48 vs.10.1±0.30,P=0.007),the number of inflammatory cells(12.6±0.60 vs.8.63±0.35,P=0.018),a significant increase in new blood vessels(12.8±0.58 vs.9.3±0.29,P=0.005)and ECM deposit(13.3±0.50 vs.9.6±0.24,P=0.001).Conclusion:LAD exerts its beneficial effects on chronic wound healing by decreasing the amount of necrotic tissue and inflammatory cells while increasing the amount of ECM deposition and angiogenesis.

关键词： Angiogenesis chronic wounds extracellular matrix granulation tissue inflammatory cell limited access dressing necrotic tissue negative pressure wound therapy

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Design of Power System Stabilizer for DFIG-based Wind Energy Integrated Power Systems Under Combined Influence of PLL and Virtual Inertia Controller

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 524-534页

作者： Balakrushna Sahu Bibhu prasad Padhy Department of Electrical Engineering Indian Institute of Technology RoparPunjab140001India

Wind energy systems (WESs) based on doubly-fed induction generators (DFIGs) have enormous potential for meeting the future demands related to clean energy. Due to the low inertia and intermittency of power injection, a WES is equipped with a virtual inertial controller (VIC) to support the system during a frequency deviation event. The frequency deviation measured by a phase locked loop (PLL) installed on a point of common coupling (PCC) bus is the input signal to the VIC. However, a VIC with an improper inertial gain could deteriorate the damping of the power system, which may lead to instability. To address this issue, a mathematical formulation for calculating the synchronizing and damping torque coefficients of a WES-integrated single-machine infinite bus (SMIB) system while considering PLL and VIC dynamics is proposed in this paper. In addition, a power system stabilizer (PSS) is designed for wind energy integrated power systems to enhance electromechanical oscillation damping. A small-signal stability assessment is performed using the infinite bus connected to a synchronous generator of higher-order dynamics integrated with a VIC-equipped WES. Finally, the performance and robustness of the proposed PSS is demonstrated through time-domain simulation in SMIB and nine-bus test systems integrated with WES under several case studies.

关键词： Doubly-fed induction generator(DFIG) virtual inertia controller(VIC) phase locked loop(PLL) small-signal analysis synchronizing/damping torque synchronous generator power system stabilizer(PSS)

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A Pair of Pseudo-differential Operators Involving Index Whittaker Transform in L_(2)^(a) (R_(+);m_(a)(x)dx)

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Acta Mathematica Sinica,English Series 2024年第6期40卷 1420-1430页

作者： Jeetendrasingh MAAN Akhilesh prasad Department of Mathematics and Computing Indian Institute of Technology(Indian School of Mines)Dhanbad-826004India

Pseudo-differential operators(PDO)Q(x,L_(a,x))and Q(x,L_(a,x))involving the index Whittaker transform are *** for these operators in Hilbert space L_(2)^(a)(R+;m_(a)(x)dx)are obtained.A symbol classΩis *** product an... 详细信息

关键词： Pseudo-differential operator index Whittaker transform confluent hypergeometric functions Hilbert space

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