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1.
Hyungson Ki Jyoti Mazumder Pravansu S. Mohanty 《Metallurgical and Materials Transactions A》2002,33(6):1817-1830
A three-dimensional laser-keyhole welding model is developed, featuring the self-consistent evolution of the liquid/vapor
(L/V) interface together with full simulation of fluid flow and heat transfer. Important interfacial phenomena, such as free
surface evolution, evaporation, kinetic Knudsen layer, homogeneous boiling, and multiple reflections, are considered and applied
to the model. The level set approach is adopted to incorporate the L/V interface boundary conditions in the Navier-Stokes
equation and energy equation. Both thermocapillary force and recoil pressure, which are the major driving forces for the melt
flow, are incorporated in the formulation. For melting and solidification processes at the solid/liquid (S/L) interface, the
mixture continuum model has been employed. The article consists of two parts. This article (Part I) presents the model formulation
and discusses the effects of evaporation, free surface evolution, and multiple reflections on a steady molten pool to demonstrate
the relevance of these interfacial phenomena. The results of the full keyhole simulation and the experimental verification
will be provided in the companion article (Part II). 相似文献
2.
We propose a discrete nonlinear controller, developed in a synchronous frame, for a parallel three-phase boost converter consisting of two modules. The basic idea, however, can be extended to a system with N modules. Each of the closed-loop power-converter modules operates asynchronously without any communication with the other modules. The controller stabilizes the currents on the dq-axes and limits the flow of the pure-zero sequence current. It combines the space-vector modulation scheme with a variable-structure control, thereby keeping the switching frequency constant and achieving satisfactory dynamic performance. 相似文献
3.
Venkateswaran R. Mazumder P. 《Very Large Scale Integration (VLSI) Systems, IEEE Transactions on》1993,1(1):31-45
The authors present the issues involved in the design of a special-purpose processing array system, called HAM, which accelerates computationally intensive wire routing tasks. It is especially suited for double-sided surface-mounted boards, which require complex three-dimensional search operations over multiple wiring planes. The novel features of the design include a hexagonal interconnection scheme to improve workload distributions during multilayer concurrent search operations and the VLSI custom design of the processors. Particular emphasis has been placed on the demands of maze routing. A cell-address propagation scheme, which is quite different from the traditional grid-coordinate approach, is discussed. It provides rapid lookup of pertinent routing information and can be extended to any distributed memory multiprocessor system. A global pipelining scheme of cell updates and expands is discussed. Experimental results are presented relating the speedup to various criteria for two different modes of parallel wave propagation 相似文献
4.
5.
Mohammad Mizanur Rahman Md. Hasan Zahir Md. Eyasin Arafat Mohammad Abu Jafar Mazumder Rami Suleiman A. Madhan Kumar 《应用聚合物科学杂志》2021,138(9):49904
A waste material called oil fly ash (OFA) was acid-functionalized, yielding f-OFA-COOH, which was then reacted with cerium oxide (CeO2) to make CeO2-functionalized OFA, or f-OFA-CeO2. Pristine OFA and f-OFA-CeO2 were used to make waterborne polyurethane (WBPU) dispersions, referred to as WBPU/OFA and WBPU/f-OFA-CeO2, respectively, with defined OFA and f-OFA-CeO2 content. All the dispersions were applied to mild steel as organic coatings to evaluate their protective properties, such as their hydrophobicity, adhesive strength and UV-shielding resistance. These protective properties varied based on the OFA and f-OFA-CeO2 content. The highest water contact angle, minimum water swelling and maximum adhesive strength were found using WBPU/f-OFA-CeO2-20 coating (using 2.00 wt% f-OFA-CeO2), which also showed the maximum ultraviolet (UV) absorption via UV–vis spectroscopy analysis. This UV shielding result also matched field test results, as that coating was found to exhibit the lowest UV degradation near a marine atmosphere, as shown by X-ray photoelectron spectroscopy (XPS) analysis. The least affected hydrophobicity was also recorded for the sample with the WBPU/f-OFA-CeO2-20 coating. 相似文献
6.
7.
An analysis of the solute dispersion in the liquid flowing through a pipe by means of Aris-Barton's ⒈method of moments',under the joint effect of some finite yield stress and irreversible absorption into the wall is presented in this paper.The liquid is considered as a three-layer liquid where the center region is Casson liquid surrounded by Newtonian liquid layer.A significant change from previous modelling exercises in the study of hydrodynamic dispersion,different molecular diffusivity has been considered for the different region yet to be constant.For all time period,finite difference implicit scheme has been adopted to solve the integral moment equation arising from the unsteady convective diffusion equation.The purpose of the study is to find the dependency of solute transport coefficients on absorption parameter,yield stress,viscosity ratio,peripheral layer variation and in addition with various diffusivity coefficients in different liquid layers.This kind of study may be useful for understanding the dispersion process in the blood flow analysis. 相似文献
8.
Shaikh A. Ali Shamsuddeen A. Haladu Mohammad A. J. Mazumder Hasan A. Al-Muallem 《Iranian Polymer Journal》2016,25(9):747-756
An aqueous solution of diallylammonium salts (CH2 = CHCH2)2NH+(CH2)3A? having A? as: CO2 ? (I), PO3H2 Cl? (II) and SO3 ? (III) in 1:1:1 mol ratio underwent ammonium persulfate-initiated ter cyclopolymerization to yield pH-responsive zwitterionic polymer IV with random placements of the monomers in the same ratio. During dialysis, PO3H2Cl? of the incorporated monomer units of II upon depletion of HCl became PO3H?. Likewise, azobisisobutyronitrile-initiated cyclopolymerization of I, II, III, and SO2 in a mole ratio of 1:1:1:3 provided pH-responsive tetrapolymer V in over 90 % yield with random and alternative placements of I–III and SO2 units, respectively, in the same ratio as the feed. Polyzwitterions (PZs) IV and V were insoluble in salt-free water but soluble in the presence of salts. The critical salt concentrations required to promote water solubility of PZ IV were determined to be 0.356 M NaCl, 0.237 M NaBr and 0.128 M NaI, whereas for PZ V the corresponding values were found to be 2.25, 1.26 and 0.862 M, respectively. PZs IV and V were converted into anionic polyelectrolytes VI and VII upon basification with NaOH. The viscosity and antiscalant behaviors of VI and VII were examined. The polymers demonstrated remarkable scale inhibition efficacies; at a dose of 10 ppm, both IV (+NaOH) and V (+NaOH) delayed the precipitation of CaSO4 from its supersaturated solution up to 920 and over 4000 min, respectively. For a small concentration of 5 ppm of polymer V, a scale inhibition of 100 % over 100 min verified it to be a potential effective antiscalant additive in reverse osmosis plants. 相似文献
9.
Mazumder M.K. Banerjee S. Ware R.E. Mu C. Kaya N. Huang C.C. 《Industry Applications, IEEE Transactions on》1994,30(2):365-369
The charge-to-mass ratio (q/m) of individual particles plays a vital role in the powder coating process. Simultaneous measurements of particle size and electrostatic charge were performed on triboelectrically charged powder paint and other powders in the particle size range 1.0 to 65.0 μm in diameter. An electrical single particle aerodynamic relaxation time (ESPART) analyzer was used to measure electrostatic charge (q) and aerodynamic size (da) distributions on a single particle basis and in a noninvasive manner. The powders were triboelectrically charged against nonconducting surfaces. Experimental data show that (1) the magnitude of the charge increases linearly with the surface area of the particle and consequently, the charge-to-mass ratio of the particles decreases inversely with respect to da in the entire size range, and (2) twenty to sixty percent of the particles were charged with opposite polarity. The average charge attained by particles larger than 4.0 μm in diameter was less than the Gaussian limit of saturation charge. The charge-to-mass ratio of the bulk powder sample depends upon the range of particle size in the sample. The mass median aerodynamic diameter of the sample studied was 30.0 μm with the geometric standard deviation of 2.0 相似文献
10.
A realistic modeling of circuit output error patterns with random test inputs is suggested. The model can be used as the basis for accurate evaluation of the probability of aliasing in compact testing. For several example compression techniques, the following aspects are investigated: identification of the error patterns that cause aliasing; asymptotic effectiveness analysis; and comparative simulation study with a limited number of random test vectors applied 相似文献