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Interaction between surface gravity wave and submerged horizontal flexible structures

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Journal of Hydrodynamics 2018年第3期30卷 481-498页

作者： Sarat.chandra Mohapatra trilochan Sahoo C.Guedes Soares Centre for Marine technology and Ocean Engineering (CENtEC) Instituto Superior TécnicoUniversidade de Lisboa Department of Ocean Engineering and Naval Architecture Indian Institute of Technology

Interactions between surface gravity wave and submerged horizontal flexible structures are studied under the assumption of small amplitude water wave theory and structural response. the generalized dispersion relation associated with surface gravity wave interaction with submerged horizontal flexible plate is analyzed to understand the characteristics of the two propagating modes due to the presence of the free surface and submerged horizontal plate. the phase and group velocities are studied in order to analyze the effect of submerged flexible plate on gravity wave motion. the expansion formulae based on Green’s function technique and eigenfunction expansion method using Fourier transform with appropriate orthogonal mode-coupling relation associated with surface gravity wavemaker problems are derived and compared in both the cases of water of finite and infinite depths. the usefulness of the expansion formulae is demonstrated by deriving the solution for surface gravity wave interaction with submerged articulated flexible plate in water of finite depth. Several numerical results on reflection and transmission coefficients related to submerged flexible plate are presented in order to understand the effect of submerged flexible structure on surface wave motion in different cases.

关键词： Submerged flexible structures Green’s function expansion formulae articulated submerged plate reflection and transmission coefficients

可循环使用的Sn-tiO_2/聚噻吩纳米杂化材料用于可见光下降解有机污染物（英文）

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催化学报 2015年第10期36卷 1668-1678页

作者： M.Ravi chandra t.Siva Rao B.Sreedhar 安得拉邦大学化学学院无机和分析化学系印度化学技术研究所无机和物理化学部

采用改进的溶胶-凝胶法在低温制备了Sn-ti O2/聚噻吩纳米杂化材料(SPNH),运用X射线衍射(XRD)、扫描电镜、X射线光电子能谱(XPS)、红外光谱(IR)、紫外-可见光漫反射光谱(UV-DRS)和BEt比表面积分析对所制样品进行了表征.XRD结果证实聚噻吩... 详细信息

采用改进的溶胶-凝胶法在低温制备了Sn-ti O2/聚噻吩纳米杂化材料(SPNH),运用X射线衍射(XRD)、扫描电镜、X射线光电子能谱(XPS)、红外光谱(IR)、紫外-可见光漫反射光谱(UV-DRS)和BEt比表面积分析对所制样品进行了表征.XRD结果证实聚噻吩(Pth)对ti O2晶相结构没有影响.IR和UV-DRS结果表明,在掺杂的金属氧化物与Pth的纳米杂化和结合过程中,Pth表面与金属氧化物之间存在相互作用(类似核壳结构).XPS结果显示,纳米杂化材料中存在Sn4+以及Pth与ti O2各自所含的元素.催化剂表面吸附污染物结果发现,SPNH的吸附容量高于Sn-ti O2纳米粒子(StN).在可见光下降解有机污染物硝基苯(NB)和孔雀绿(MG)的反应中,SPNH表现出比单纯StN更高的光催化活性和稳定性.由于StN上存在聚噻吩,使得样品表面吸附NB(24%)和MG(21%)的能力增加,从而导致更高的光催化收率.考察了该光催化剂在可见光下重复使用5次时的光催化活性,未见Pth的消耗和降解.这些高光催化活性的SPNH材料有望在工业水净化中用作光催化剂.

关键词：锡二氧化钛聚噻吩纳米杂化材料硝基苯孔雀绿可见光光催化可循环使用性

Incidence and management of white grub, Schizonycha ruficollis on seedlings of teak （tectona grandis Linn, f,）

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Insect Science 2007年第5期14卷 411-418页

作者： NItIN KULKARNI KAILASH chandra PRAFULLA NARAHAR WAGH KAILASH chandra JOSHI RAM BHAJAN SINGH Forest Entomology Division Tropical Forest Research Institute Jabalpur (M. P.) Central Regional Station Zoological Survey of India Vijay Nagar Jabalpur (M. P.) Forest Development Corporation of Maharashtra Nagpur India

In investigation was conducted annually from 2002 to 2005 between the second week of May and the end of September on the incidence of scarab beetle, Schizonycha ruficollis （Fabricius） in a teak （tectona grandis L.f.） nursery at Ramdongari, Nagpur, India. the immature stages, that is white grubs of the scarab beetle damaged 14%-52% of teak seedlings in the nursery beds, whereas the adult of the species, that is scarab beetles, were recorded on three new host trees （ Ziziphus xylopyra, Acacia catechu and A. leucophloea） in addition to the reported hosts such as ziziphus （Z. jujuba and Z. mauritiana）. Beetles of the S. ruficollis started emerging from the nursery beds just after the pre-monsoon showers and continued for 10-18 days. While beetle of S. ruficollis defoliated tree hosts available in the surroundings, the immature stages of the beetle caused major damage by feeding on root systerfls of teak seedlings with symptoms of wilting and mortality in forest nursery beds. the result of chemical and biological treatments for the management of grubs of S. ruficollis in nursery beds indicated phorate 10% granular at the rate of 20 g/m^2 and chlorpyriphos 20% emulsifiable concentrate at the rate of 5.0 mL/m^2 to be effective. Grubs of S. ruficollis have not been recorded previously as a major pest of teak （t. grandis）. this is also the first report on occurrence of S. ruficollis adults on tree hosts such as Z. xylopyra, A. catechu and A. leucophloea. White grubs being pests of economic importance and the toughest insects to manage, information given in this paper on incidence, pest status and management of Schizonycha ruficollis is of importance to researchers and forest nursery managers.

关键词： bioecology Coleoptera field incidence forest nursery insect pest management,insecticides Melolonthinae Scarabaeidae

Biomethanisation of Municipal Solid Waste by Anaerobic Fungi Co-culture with Methanogens： An Approach to Energy Recovery

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Journal of Environmental Science and Engineering 2010年第6期4卷 60-66页

作者： N.R. chandra Shekar reddy H.K. Ramaraju Quality ＆ Environment Volvo India Private Limited Bangalore 562122 Karnataka India Civil ＆ Environnemental Engineering Department Dayananda Sagar College of Engineering Kumara Swamy Layout Bangalore560078 Karnataka India

In nature, cellulose, lignocellulose and lignin are major sources of plant biomass; their recycling is indispensable for global carbon cycle. the major portion of the municipal solid waste consists of lignocellulose. the incineration of organic fraction of municipal solid waste （OFMSW） with high moisture content and low calorific value is not environmentally, techno-commercially viable option for energy recovery. Optimization of biomethanisation process is aim to maximize organic waste stabilization at short digestion period with higher energy recovery. the biomethanisation studies, demonstrate co-digestion of substrates improves CH4 yield due to nutrients balance. Fungi are low sensitive to environment, thrive in acidic environment and produces required multi-enzyme, attach to cell envelope and hydrolyze the substrate for energy recovery. Fermentation of cellulose by the monoculture results in the formation of H2, CO2, formate, acetate, lactate, succinate, and ethanol. In co-cultures with Methanobacterium, H2 and formate reduction indicates it＇s utilized in CH4 production. Engineered co-culture of microorganisms is essential for the heterogeneous complex organic substrate degradation for extraction of unutilized energy fraction of biomass, as potential source of energy.

关键词： MSW anaerobic fungi cellulose degradation enzymes

Machine learned interatomic potentials using random features

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npj Computational Materials 2022年第1期8卷 48-57页

作者： Gurjot Dhaliwal Prasanth B.Nair chandra Veer Singh Department of Mechanical and Industrial Engineering University of Toronto5 King’s College RdTorontoM5S 3G8ONCanada Institute for Aerospace Studies University of Toronto4925 Dufferin StTorontoM3H 5T6ONCanada Department of Materials Science and Engineering University of Toronto184 College StTorontoM5S 3E4ONCanada

We present a method to model interatomic interactions such as energy and forces in a computationally efficient *** proposed model approximates the energy/forces using a linear combination of random features,thereby enabling fast parameter estimation by solving a linear least-squares *** discuss how random features based on stationary and non-stationary kernels can be used for energy approximation and provide results for three classes of materials,namely two-dimensional materials,metals and *** and energy predictions made using the proposed method are in close agreement with density functional theory calculations,with training time that is 96%lower than standard kernel *** Dynamics calculations using random features based interatomic potentials are shown to agree well with experimental and density functional theory *** frequencies as computed by random features based interatomic potentials are within 0.1%of the density functional theory ***,the proposed random features-based potential addresses scalability issues encountered in this class of machine learning problems.

关键词： random stationary interatomic

Photoluminescence and Energy transfer Process in Bi<sup>3+</sup>/Sm<sup>3+</sup>Co-Doped Phosphate Zinc Lithium Glasses

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Advances in Materials Physics and Chemistry 2014年第9期4卷 165-171页

作者： chandragiri Parthasaradhi reddy Varnakavi Naresh Ballipalli chandra Babu Srinivasa Buddhudu Department of Physics Sri Venkateswara University Tirupati India

Present paper reports on luminescence characteristics of individually doped Bi3+: PZL, Sm3+: PZL and co-doped (Bi3+/Sm3+): PZL (50P2O5-30ZnO-20LiF) glasses prepared by a melt quenching method. the results revealed that Bi3+: PZL glass exhibited a broad emission peak at 440 nm (3P1→1S0) under excitation wavelength 300 nm (1S0→3P1). Sm3+: PZL doped glass has shown a prominent orange emission at 601 nm (4G5/2→6H7/2) with an excitation wavelength 403 nm (6H5/2→4F7/2). Later on Bi3+ is added to Sm3+: PZL glass by increasing its concentrations from 0.1 - 1.5 mol%. By co-doping Bi3+ to Sm3+: PZL glass, Sm3+ emission intensity has been considerably enhanced till 1.0 mol% due to energy transfer from Bi3+ to Sm3+ and when its concentration exceeds this critical value (1.0 mol%) there has been a drastic decrease in Sm3+ emission which is explained accordingly from photoluminescence spectra, energy level diagram and lifetime measurements.

关键词： Melt Quenching Optical Glasses Rare Earth Ions Photoluminescence Luminescence Quenching and Energy transfer

Investigation on 1.07 μm laser emission in Nd^(3+)-doped sodium fluoroborate glasses

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Journal of Rare Earths 2012年第5期30卷 413-417页

作者： D.Umamaheswari B.C.Jamalaiah t.Sasikala G.V.Lokeswara reddy L.Rama Moorthy Department of Physics Sri Venkateswara UniversityTirupati517 502India Department of Physics Changwon National UniversityChangwon641 773Republic of Korea

Spectroscopic and fluorescence properties of Nd 3＋ ions in sodium fluoroborate（SFB） glasses were prepared and characterized through optical absorption,emission and decay *** energy level analysis was carried out using free-ion Hamiltonian *** oscillator strengths were determined by measuring the area encompassed by the absorption peaks recorded for 1.0 mol.% Nd 3＋-doped *** Judd-Ofelt parameters（2,4,6） were used to evaluate the laser characteristic parameters such as radiative transition probability（A R）,radiative decay time（τ R）,fluorescence branching ratio（β R） and stimulated emission cross-section（σ e） for the 4 F 3/2 metastable *** fluorescence spectra for different concentrations of Nd 3＋ ions were recorded by exciting the samples at 514.5 nm Ar ＋ ion laser.

关键词： sodium fluoroborate glasses rare earth spectroscopy Judd-Ofelt theory laser materials

Compact analytical model for single gate AlInSb/InSb high electron mobility transistors

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Journal of Semiconductors 2014年第11期35卷 46-50页

作者： S.theodore chandra N.B.Balamurugan G.Subalakshmi t.Shalini G.Lakshmi Priya National Instruments Electronics Laboratory Department of ECEThiagarajar College of Engineering

We have developed a 2D analytical model for the single gate AllnSb/lnSb HEMt device by solving the Poisson equation using the parabolic approximation method. the developed model analyses the device perfomance by calculating the parameters such as surface potential, electric field distribution and drain current. the high mobility of the AlInSb/InSb quantum makes this HEMt ideal for high frequency, high power applications. the working of the single gate AllnSb/InSb HEMt device is studied by considering the variation of gate source voltage, drain source voltage, and channel length under the gate region and temperature. the carrier transport efficiency is improved by uniform electric field along the channel and the peak values near the source and drain regions. the results from the analytical model are compared with that of numerical simulations （tCAD） and a good agreement between them is achieved.

关键词： high electron mobility transistor AlInSb/InSb quantum well 2D analytical model Poisson's equation surface potential electric field

Curcumin encapsulated dual cross linked sodium alginate/montmorillonite polymeric composite beads for controlled drug delivery

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Journal of Pharmaceutical Analysis 2021年第2期11卷 191-199页

作者： O.Sreekanth reddy M.C.S.Subha t.Jithendra C.Madhavi K.Chowdoji Rao Department of Chemistry Sri Krishnadevaraya UniversityAnanthapuramu515003India Department of Polymer Science and technology Sri Krishnadevaraya UniversityAnanthapuramu515003India

the aim of the present work is fabrication of dual cross linked sodium alginate(SA)/montmorillonite(MMt) microbeads as a potential drug vehicle for extended release of curcumin(CUR). the microbeads were prepared using in situ ion-exchange followed by simple ionotropic gelation technique. the developed beads were characterized by Fourier transform infrared spectroscopy(FtIR), differential scanning calorimetry(DSC), thermogravimetric analysis(tGA), X-ray diffraction(X-RD) and scanning electron microscopy(SEM). the effect of MMt on encapsulation efficiency of CUR and intercalation kinetics was investigated. Dynamic swelling study and in vitro release study were investigated in simulated intestinal fluid(pH 7.4) and simulated gastric fluid(pH 1.2) at 37 ℃. Results suggested that both the swelling and in vitro release studies were influenced by the pH of test media, which might be suitable for intestinal drug delivery. the release mechanism was analyzed by fitting the release data into KorsmeyerPeppas equation.

关键词： Curcumin Sodium alginate Montmorillonite Microbeads Drug delivery