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Single Crystal Metal Oxide Nanowires as Bio-Chem Sensing probes

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稀有金属材料与工程 2006年第A03期35卷 295-298页

作者： p.Gouma A.Bishop k.k.Iyer Dept of Materials Science & Engineering State University of New YorkStony BrookNY11794-2275USA

Single crystal MoO_3 nanowires were produced using the electrospinning *** resolution transmission electron microscopy (HRTEM) revealed that the 1-D nanostructures are 10nm in diameter,on the order of 1μm～2μm in length, and have an orthorhombic *** has been demonstrated that a nano-network of MoO_3 nanowires exhibits higher sensitivity and an n-type response to NH_3 as compared to the response of a traditional sol-gel *** structure,crystallinity, and sensoric nature of these single-step processed nanowires are discussed.

关键词： single crystal nanowires electrospinning HRTEM sensor

Effect of promoters on dynamics of gas-solid fluidized bed——Statistical and ANN approaches

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China particuology 2007年第6期5卷 401-407页

作者： Y.k. Mohanty k.C. Biswal G.k. Roy B.p. Mohanty Department of Chemical Engineering GIET Gunupur 765 022 Rayagada Orissa India Department of Chemical Engineering NIT Rourkela 769008 Orissa India

In this study, a bubbling fluidized bed column, 99 mm in inside diameter and 960 mm in height, was used to investigate the effect of rod and disc promoters on fluctuation and expansion ratios. Factorial design （statistical approach） and artificial neural network （ANN） models were developed to predict the fluctuation and expansion ratios in this gas-solid fluidized bed with varying gas flow rates, bed heights, particle sizes and densities. The fluctuation and expansion predicted using these statistical and ANN models, for beds with and without promoters, were found to agree well with corresponding experiments. The statistical model was found to be superior to the ANN model due to its ability to take into account both individual and interactive effects. The rod promoters were found to be more effective in reducing bed fluctuation, and in increasing bed expansion at high gas mass velocities.

关键词： Gas-solid fluidized bed Fluctuation ratio Expansion ratio promoter Factorial design Artificial neural network

Effect of dysprosium substitution on structural and dielectric properties of BiFeO_3-pbTiO_3 multiferroic composites

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Journal of Rare Earths 2015年第6期33卷 639-646页

作者： N.k.Mohanty A.k.Behera S.k.Satpathy Banarji Behera p.Nayak Materials Research Laboratory School of Physics Sambalpur University

0.5BiDyxFe1-xO3-0.5pbTiOa（0.5BDxF1-x-0.5pT）（x=0.00, 0.05, 0.10, 0.15, 0.20） multiferroic composites were pre- pared by conventional solid state reaction method. Structural characterization was performed by X-ray diffraction and the mate- rials showed tetragonal structure at room temperature. Surface morphology of the composites was studied by a scanning electron microscope （SEM）. Frequency and temperature dependence of dielectric constant （er） and dielectric loss （tan~） of 0.5BDxF1_x- 0.5pT were measured in a wide range of frequency （100 Hz to 1 MHz） and temperature （25 to 400 ~C）. The analysis of the study showed that the er and tang decreased with increasing frequency in the given range for all the samples which could be explained through the occurrence of dipole relaxation process. The effect of substitution of rare earth element dysprosium （Dy） showed increase in er in all the samples prepared for different concentrations from 0.00 to 0.20. An explanation for high value of er for Dy modified 0.5BiFeO3-0.5pbTiO3 （0.5BF-0.5pT） compared to Gd modified 0.5BF-0.5pT was provided. The variation of AC conductivity with inverse temperature found to obey the Arrhenius equation and the composites showed negative temperature coefficient of resistance （NTCR） behavior. The activation energy was found to be in the range from 0.25 to 0.40 eV for all the studied samples.

关键词： X-ray diffraction dielectric constant tangent loss activation energy rare earths

Influence of coal properties on coal conversion processes-coal carbonization,carbon fiber production,gasification and liquefaction technologies:a review

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International Journal of Coal Science & Technology 2021年第5期8卷 817-843页

作者： k.p.keboletse F.Ntuli O.p.Oladijo Department of Chemical Materials and Metallurgical EngineeringBotswana International University of Science and TechnologyPalapyeBotswana

Coal due to its relatively large quantities and wide distribution worldwide has generated renewed interest in research and development with the aim of establishing coal conversion technologies that are technically reliable,envi-ronmentally and economically *** has proved to be a prominent energy source in emerging markets with increasing energy demand by accounting for the largest increase in the demand of energy amongst all other energy ***-thermore,with its higher mesophase content,coal tar is an appropriate raw material for precursors in the production of carbon ***,whenever a material is put to use,it is important to be able to associate its properties to the behavioral characteristics during a conversion process so as to have a basis for opting for the material in a given process or adjusting the operating conditions in order to optimize the material ***,as with any other material,it is important to be able to relate the properties of coal to its utilization.A review was carried out on the influence of coal properties on four main utilization technologies:gasification,carbonization,liquefaction and carbon fibre *** several properties rank,type,mineral matter content,distribution of trace elements,structural composition and pore structure were found to be most influential on the behavior of coal during conversion processes.

关键词： Coal properties Carbonization Liquefaction Gasification Carbon fibre

Evaluation and prediction of blast induced ground vibration using support vector machine

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Mining Science and Technology 2010年第1期20卷 64-70页

作者： kHANDELWAL M kANkAR p k HARSHA S p Department of Mining Engineering College of Technology & Engineering Maharana Pratap University of Agriculture & Technology Udaipur 313001 India Department of Mechanical & Industrial Engineering Indian Institute of Technology Roorkee 247667 India

We present the application of Support Vector Machine (SVM) for the prediction of blast induced ground vibration by taking into consideration of maximum charge per delay and distance between blast face to monitoring point. To investigate the suitability of this approach, the predictions by SVM have been compared with conventional predictor equations. Blast vibration study was carried out at Magnesite mine of pithoragarh, India. Total 170 blast vibrations data sets were recorded at different strate-gic and vulnerable locations in and around to mine. Out of 170 data sets, 150 were used for the training of the SVM network as well as to determine site constants of different conventional predictor equations, whereas, 20 new randomly selected data sets were used to compare the prediction capability of SVM network with conventional predictor equations. Results were compared based on Co-efficient of Determination (CoD) and Mean Absolute Error (MAE) between monitored and predicted values of peak particle Veloc-ity (ppV). It was found that SVM gives closer values of predicted ppV as compared to conventional predictor equations. The coef-ficient of determination between measured and predicted ppV by SVM was 0.955, whereas it was 0.262, 0.163, 0.337 and 0.232 by USBM, Langefors-kihlstrom, Ambraseys-Hendron and Bureau of Indian Standard equations, respectively. The MAE for ppV was 11.13 by SVM, whereas it was 0.973, 1.088, 0.939 and 1.292 by USBM, Langefors-kihlstrom, Ambraseys-Hendron and Bureau of Indian Standard equations respectively.

关键词： blast vibration support vector machine generalised predictor equations

Nano Sized Copper Selenide Thin Film pre-Cursor by A Liquid phase Chemical Growth process

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稀有金属材料与工程 2012年第S1期41卷 24-27页

作者： Deshmukh L p Deshmukh S k Thin Film and Solar Studies Research Laboratory Department of PhysicsSolapur UniversitySolapur-413 255M.S.India

The deposition of copper selenide(CuSe)thin films was carried out using liquid phase chemical bath deposition process at the optimized growth parameters as:60℃deposition temperature,90 minutes deposition time,pH equal to 10.5±0.1 and 72±2 r/min speed of mechanical *** as-grown deposits exhibited excellent uniformity and physical adherency with the substrate surface and are smooth and diffusely reflecting with colour changing from yellowish orange to dark chocolate during *** layer is of the order of 300 nm *** EDS analysis technique gave film composition to be nearly stoichiometric(Cu=47.89%,Se=52.11%).An X-ray diffraction analysis showed CuSe to be polycrystalline hexagonal with a good match of d-values and intensities of *** crystallite size is in the nanorange(50-60 nm).The as-deposited CuSe exhibited a high coefficient of absorption(α=105cm-1)with a direct optical band gap of 1.81 *** to other chalcogenides,CuSe films exhibit low resistance;room temperature electrical resistivity being 1.55×103?*** electrical conductivity decreased with increase in temperature up to 473 k;showing totally unusual behaviour from that of the semiconducting *** thermo probe measurements showed n-type conduction of the samples.

关键词： LpCBD solar absorber Cu-deficient hexagonal metal like behaviour direct transition

Network and plage indices from kodaikanal Ca-k data

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Research in Astronomy and Astrophysics 2014年第2期14卷 229-232页

作者： k.p.Raju Jagdev Singh Indian Institute of Astrophysics

The Ca II k filtergrams from kodaikanal Solar Observatory have been used to study solar activity. The images are dominated by the chromospheric network and plages. programs have been developed to obtain the network and plage indices from the daily images as functions of solar latitude and time. preliminary results from the analysis are reported here. The network and plage indices were found to follow the sunspot cycle. A secondary peak is found during the period of declining activity in both the indices. A comparison of network indices from the northern and the southern hemispheres shows that the former is more active than the latter. However such an asymmetry is not clearly seen in the plage index.

关键词： Sun chromosphere

Spinosad and neem seed kernel extract as bio-controlling agents for malarial vector,Anopheles stephensi and non-biting midge,Chironomus circumdatus

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Asian pacific Journal of Tropical Medicine 2011年第8期4卷 614-618页

作者： kumar AN Murugan k Madhiyazhagan p prabhu k Department of Zoology Bharathiar UniversityCoimbatore - 641 046India

Objective:Midge egg masses are reported to support non-pathogenic strains of the cholera *** cholera（***）.Mosquito born diseases have been reported to cause millions of death *** present research reveals the toxicity effect of spinosad and neem seed kernel extract（NSkE） against different larval stages of Anopheles stephensi（***） and Chironomus circumdatus（***）.Methods:The neem seeds were collected from Marudamalai hills,Bharathiar University,Coimbatore,*** seed kernels were powdered,extracted and diluted for different concentrations（2 ppm to 10 ppm）.Spinosad was purchased from kalpatharu pesticide Limited,Coimbatore,Tamil Nadu,India and thoroughly mixed with distilled water to prepare various concentrations（0.01 to 0.08 ppm） and used for ***:The results depict that spinosad is more toxic in lower concentrations when compared to NSkE and mosquitoes are more susceptible than *** concentrations were evaluated using the observed *** lowest LC50 value obtained from spinosad against *** and *** were 0.002 05 ppm and 0.008 91 *** study investigated on effect of Spinosad and NSkE on the biology of *** immature stages of both species were susceptible to Spinosad and *** and NSkE in individual as well as combined treatment provided additional days in development for ***:The results conclude that Spinosad and NSkE are potential larvicides against *** and Ch. circumdatus.

关键词： Mosquitoes Chironomids Bioassay Lethal concentrations Larval durations

Machine Learning Based Classifiers for QoE prediction Framework in Video Streaming over 5G Wireless Networks

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Computers, Materials & Continua 2023年第4期75卷 1919-1939页

作者： k.B.Ajeyprasaath p.Vetrivelan School of Electronics Engineering Vellore Institute of TechnologyChennai600127India

Recently,the combination of video services and 5G networks have been gaining attention in the wireless communication *** the brisk advancement in 5G network usage and the massive popularity of threedimensional video streaming,the quality of experience(QoE)of video in 5G systems has been receiving overwhelming significance from both customers and service provider ***,effectively categorizing QoE-aware video streaming is imperative for achieving greater client *** work makes the following contribution:First,a simulation platform based on NS-3 is introduced to analyze and improve the performance of video *** simulation is formulated to offer real-time measurements,saving the expensive expenses associated with real-world ***,A valuable framework for QoE-aware video streaming categorization is introduced in 5G networks based on machine learning(ML)by incorporating the hyperparameter tuning(HpT)*** implements an enhanced hyperparameter tuning(EHpT)ensemble and decision tree(DT)classifier for video streaming *** performance of the ML approach is assessed by considering precision,accuracy,recall,and computation time metrics for manifesting the superiority of these classifiers regarding video streaming *** paper demonstrates that our ML classifiers achieve QoE prediction accuracy of 92.59%for(EHpT)ensemble and 87.037%for decision tree(DT)classifiers.

关键词： QoE-aware video streaming 5G networks wireless networks ensemble method