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An effective round ball tool in electrochemistry process as novel reuse fabrication technology

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中国有色金属学会会刊：英文版 2012年第S3期22卷 825-830页

作者： P.S.pa Department of Digital Content Design Graduate School of Toy and Game DesignNational Taipei University of Education

A reuse fabrication module using micro electrochemistry (MECM) with a round-ball tool to remove the defective In2O3 SnO2 thin film from the surfaces of digital paper display was *** etching effect improves that the number of the round-balls decreases for promoting the concentration of electric power and increasing discharge *** a small size of the round-ball tool takes less time for the same amount of In2O3 SnO 2 layer removal since the effect of MECM is easily developed for supplying of sufficient electrochemical power.A higher feed rate of the poly ethylene terephthalate (PET) diaphragm combines with enough electric power to drive fast etching rate.A pulsed direct current can improve the effect of dreg discharge and is advantageous to couple this current with the fast feed rate of the *** the ultra-precise etching of In2O 3 SnO2,the optoelectronic semiconductor industry can effectively reuse the defective products,reducing production *** precision etching process is of high efficiency and requires only a short period of time to remove the In2O3 SnO2 nanostructures.

关键词： thin film round-ball tool In2O3SnO2 micro electrochemistry digital paper display

Ammonium persulphate promoted synthesis of polyethylene glycol entrapped potassium tribromide and its application in acylation and bromination of some selective organic compounds

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Chinese Chemical Letters 2013年第10期24卷 866-868页

作者： Rupa Rani dey Siddhartha Sankar Dhar Department of Chemistry National Institute of Technology

In this study, a new method of synthesis of polyethylene glycol supported potassium tribromide （PEG KBr3） and its application in acylation and bromination reactions are reported. Ammonium persulphate oxidizes I（Br to the corresponding tribromide which is entrapped by polyethylene glycol leading to stable PEG KBr3. The reagent is proved to be highly efficient for the acylation of variety of alcohols and bromination of activated aromatic substrates. The method is a mild, one pot reaction and involves no use of toxic reagents.

关键词： Potassium bromide Polyethylene glycol (PEG) Ammonium per sulphate Acylation Bromination

Synthesis of Nanocrystalline FeS_2 with Increased Band Gap for Solar Energy Harvesting

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Journal of Materials Science & Technology 2014年第8期30卷 770-775页

作者： Somnath Middya Animesh Layek Arka dey partha Pratim Ray Department of Physics Jadavpur University

In this paper,we have reported the synthesis of FeS2 of higher band gap energy（2.75 eV） by using capping reagent and its successive application in organic-inorganic based hybrid solar *** route was adopted for preparing iron pyrite（FeS2） nanoparticles with capping reagent *** quality of synthesized FeS2 material was confirmed by X-ray diffraction,field emission scanning electron microscopy,transmission electron microscopy,Fourier transform infrared,thermogravimetric analyzer,and Raman *** optical band gap energy and electro-chemical band gap energy of the synthesized FeS2 were investigated by UV-vis spectrophotometry and cyclic *** band gap engineered FeS2 has been successfully used in conjunction with conjugated polymer MEHPPV for harvesting solar *** energy conversion efficiency was obtained as 0.064%with a fill-factor of 0.52.

关键词： Hydrothermal synthesis FeS2 nanoparticles Optical characterization Energy band gap

Effective tool design of three-rank form as precision removal-process of ITO thin-films

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中国有色金属学会会刊：英文版 2009年第B9期19卷 232-237页

作者： pai-shan pa Digital Content Design Graduate School of Toy and Game DesignNational Taipei University of Education

A new effective tool design of three-rank form of electroremoval was present using a precision recycle system offering faster performance in removing the indium-tin-oxide(ITO) thin-films on color filter surface of displays. Higher electric power is not required since the three-rank form tool is adopted as a feeding mode to reduce the response area. The low yield of ITO persists throughout the entire semiconductor production process. By establishing a recycle process of ultra-precise removal of the thin-film nanostructure, defective products in the optoelectronic semiconductors industry can be effectively recycled, decreasing both production costs and pollution. A 5th generation TFT-LCD was used. The design features of the removal processes for the thin-films and the tool design of three-rank form were of major interest. For the precision removal processes, a pulsed current can improve the effect of dreg discharge and contributes to the achievement of a fast workpiece (displays' color filter) feed rate, but raises the current rating. High flow velocity of the electrolyte with a high rotational speed of the tool electrodes elevates the ITO removal effect. A displays' color filter with a fast feed rate is combined with enough electric power to provide highly effective removal. A small thickness of the rank and a small arc angle of the negative-electrode correspond to a higher removal rate for ITO-film. An effective three-rank form negative-electrode provides larger discharge mobility and better removal effect. It only needs a short period of time to remove the ITO easily and cleanly.

关键词：工具设计薄膜材料 ITO

Effects of particle fractions on the Bingham yield stress and viscosity of fine-coarse particle suspensions

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Journal of Mountain Science 2021年第11期18卷 2960-2970页

作者： dey Litan JAN Chyan-Deng WANG Ji-Shang Department of Hydraulic and Ocean Engineering National Cheng Kung UniversityTainan 701Chinese Taipei Ecological Soil and Water Conservation Research Center National Cheng Kung UniversityTainan 701Chinese Taipei

The rheological behaviors of highly concentrated fine particle suspensions(clay-silt-water mixtures)and coarse particle suspensions(coarse particles within a fine particle suspension)were investigated in this *** results demonstrated that the Bingham Fluid Model with two rheological parameters,Bingham yield stressand viscosity,wellcharacterized the rheological behavior of fine particle suspensions at shear rates between 4 and 20 s^(-1).The inclusion of coarse particles within a fine particle suspension induced an enhancement to the rheological *** rheological parameters of a coarse particle suspension not only depend on its total particle fraction but also on its relative fine/coarse particle *** equations of these two parameters were proposed,quantitatively related to both fine and coarse particle *** indicated that the Bingham yield stress and viscosity are much more(an order larger)sensitive to changes in fine particle fraction than to changes in coarse particle fraction.

关键词： Coarse particle suspension Bingham Fluid Model particle fractions Rheologicalparameters

Suspended load in flows on erodible bed

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International Journal of Sediment Research 2009年第3期24卷 315-324页

作者： Sujit K. BOSE Subhasish dey Visiting Fellow Department of Civil Engineering Indian Institute of Technology Chair Prof. Department of Civil Engineering Indian Institute of Technology

Steady state suspended-load of sediment transported in flow over erodible beds usually is treated by the advection-diffusion approach, though in recent years, it is being treated as a two-phase flow phenomenon incorporating kinetics of sediment particles. Among the advection-diffusion approaches, Rouse’s equation is the well-known, although a number of researchers in later periods have attempted to improve it by modifying the mixing length concept taking into account other aspects. In this paper, the advection-diffusion approach and associated logarithmic law of flow velocity are revisited. It is concluded from the logarithmic law that the Reynolds shear stress is a linear function of height above the bed, which reduces to bed shear stress in the case of a long horizontal channel. As a consequence, it is shown that the volumetric concentration of sediment is best approximated by the sum of two power laws of height above the bed. An equation is derived for the suspended-load transport rate in terms of elementary functions.

关键词： Sediment transport Fluvial hydraulics Suspended load Open channel flow

VO(acac)_2 catalyzed condensation of o-phenylenediamine with aromatic carboxylic acids/aldehydes under microwave radiation affording benzimidazoles

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Chinese Chemical Letters 2011年第3期22卷 296-299页

作者： Madhudeepa.dey Krishnajyoti Deb Siddhartha Sankar Dhar Department of Chemistry National Institute of TechnologySilcharSilchar 788010AssamIndia

Vanadyl acetylacetonate,VO（acac）_2,has been found to be very effective catalyst for synthesis of a variety of benzimidazoles under solvent-free *** methodology involves the exposure of a mixture of o-phenylenediamine and a selected aromatic carboxylic acid/aldehyde to microwave radiation without the use of any solvent or supporting *** benzimidazoles were obtained in quick time with high yields.

关键词： Vanadyl acetylacetonate o-Phenylenediamine Microwave irradiation Solvent-free

Dynamic properties and liquefaction behaviour of cohesive soil in northeast India.under staged cyclic loading

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第5期10卷 958-967页

作者： Shiv Shankar kuma. A.Murali Krishna Arindam dey Department of Civil Engineering Indian Institute of Technology Guwahati

Estimation of strain-dependent dynamic soil properties, e.g. the shear modulus and damping ratio, along with the liquefaction potential parameters, is extremely important for the assessment and analysis of almost all geotechnical problems involving dynamic loading. This paper presents the dynamic properties and liquefaction behaviour of cohesive soil subjected to staged cyclic loading, which may be caused by main shocks of earthquakes preceded or followed by minor foreshocks or aftershocks, respectively. Cyclic triaxial tests were conducted on the specimens prepared at different dry densities （1.5 g/cm3 and 1.75 g/cm3） and different water contents ranging from 8% to 25%. The results indicated that the shear modulus reduction （G/Gmax） and damping ratio of the specimen remain unaffected due to the changes in the initial dry density and water content. Damping ratio is significantly affected by confining pressure, whereas G/Gmax is affected marginally. It was seen that the liquefaction criterion of cohesive soils based on single-amplitude shear strain （3.75% or the strain at which excess pore water pressure ratio becomes equal to 1, whichever is lower） depends on the initial state of soils and applied stresses. The dynamic model of the regional soil, obtained as an outcome of the cyclic triaxial tests, can be successfully used for ground response analysis of the region.

关键词： Cohesive soil Dynamic soil properties Liquefaction potential Cyclic triaxial tests Staged cyclic loading

Simultaneous pole-placement/stabilization of pairs of linear time-invariant plants using a continuous-time periodic controller

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控制理论与应用（英文版） 2011年第4期9卷 493-499页

作者： Jayati dey Sarit K. DAS Department of Electrical Engineering National Institute of Technology Department of Electrical Engineering Indian Institute of Technology

Given a pair of single input single output （SISO）, linear time-invariant （LTI）, and strictly proper plants of relative order r, this paper employs a continuous-time periodic controller to achieve 1） simultaneous pole-placement for r = 1 and 2） guaranteed simultaneous stabilization for r = 2, 3, and 4, which jobs LTI controllers cannot, in general, do. The controller also ensures insignificant output ripples. The analysis is based on averaging principle. The computational steps for controller synthesis are linear algebraic in nature. An example illustrates the design procedure.

关键词： Periodic controller Simultaneous pole-placement/stabilization