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bEsT WEIGHT PATTERN EVALUATION bAsED sECURITY CONsTRAINED POWER DIsPATCH ALGORITHM

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Journal of systems science and systems Engineering 2007年第3期16卷 287-307页

作者： Lakhwinder sINGH J.s. DHILLON baba banda singh bahadur Engineering College Fatehgarh Sahib- 140407 Punjab India sant Longowal Institute of Engineering & Technology Longowa1-148 106 Punjab India

This paper presents a methodology which determines the allocation of power demand among the committed generating units while minimizes number of objectives as well as meets physical and technological system constraints. The procedure considers two decoupled problems based upon the dependency of their goals on either active power or reactive power generation. both the problems have been solved sequentially to achieve optimal allocation of active and reactive power generation while minimizes operating cost, gaseous pollutants emission objectives and active power transmission loss with consideration of system operating constraints along with generators prohibited operating zones and transmission line flow limits. The active and reactive power line flows are obtained with the help of generalized generation shift distribution factors （GGDF） and generalized Z-bus distribution factors （GZbDF）, respectively. First problem is solved in multi-objective framework in which the best weights assigned to objectives are determined while employing weighting method and in second problem, active power loss of the system is minimized subject to system constraints. The validity of the proposed method is demonstrated on 30-bus IEEE power system.

关键词： Multi-objective optimization best weight pattern evaluation fuzzy decision making membership function generalized generation shift distribution factors generalised Z-bus distribution factors

study on mixing and segregation behaviors in particulate fluidized bed system for mineral processing

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International Journal of Mining science and Technology 2015年第3期25卷 459-464页

作者： sahu s.N. sahu A.K. biswal s.K. Mineral Processing Department CSIR-Institute of Minerals and Materials Technology

In order to identify the mixing and segregation behaviors in a mineral processing operation, present study aimed on the hydrodynamics of solid–liquid fluidization. The study was carried out in a fluidization column with tapings at different height of the bed to collect the sample. The binary particles considered in this study are hematite(4800 kg/m3) and quartz(2600 kg/m3) at different size fractions in the range of average size 87×10^(-6)m to 400×10^(-6)m. It is observed that for various binary mixtures, both quartz and hematite particles share the equal composition by mass(50%) at a particular height of fluidized bed, referred as ‘‘locus point'' of mixing. study indicates that the mixing zone volume will increase for a continuous fluidized bed plant operation. It is observed that the number of locus points varies from 1 to 3 signifying their dependency on the size ratios of binary mixture. Whenever, the difference in terminal velocity between quartz and hematite particles approaches to zero, mixing is ***, the present study is extended to find the segregation index for the different size ratios of quartz and hematite particles. It is evident that depending on the size ratios, various regions such as complete segregation, partial mixing and complete mixing can be observed.

关键词： Liquid-solid fluidization Mixing segregation Locus point Mineral processing

Preparation of fly ash and rice husk ash geopolymer

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International Journal of Minerals,Metallurgy and Materials 2009年第6期16卷 720-726页

作者： s. Detphan P. Chindaprasirt Department of Civil Engineering Khon Kaen University

The geopolymer of fly ash （FA） and rice husk ash （RHA） was prepared. The burning temperature of rice husk, the RHA fineness and the ratio of FA to RHA were studied. The density and strength of the geopolymer mortars with RHA/FA mass ratios of 0/100, 20/80, 40/60, and 60/40 were tested. The geopolymers were activated with sodium hydroxide （NaOH）, sodium silicate, and heat. It is revealed that the optimum burning temperature of RHA for making FA-RHA geopolymer is 690oC. The as-received FA and the ground RHA with 1%-5% retained on No.325 sieve are suitable source materials for making geopolymer, and the obtained compressive strengths are between 12.5-56.0 MPa and are dependent on the ratio of FA/RHA, the RHA fineness, and the ratio of sodium silicate to NaOH. Relatively high strength FA-RHA geopolymer mortars are obtained using a sodium silicate/NaOH mass ratio of 4.0, delay time before subjecting the samples to heat for 1 h, and heat curing at 60oC for 48 h.

关键词： geopolymer fly ash rice husk ash sodium hydroxide sodium silicate

Phenotypic differences between coryneform bacteria isolated from seminal fluid of healthy men and men with chronic prostatitis syndrome

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Asian Journal of Andrology 2009年第4期11卷 517-520页

作者： Iuri b Ivanov Viktor A Gritsenko Michael D Kuzmin Department of Human Microbiology Institute of Cellular and Intracellular Symbiosis Russian Academy of Sciences Orenburg 460056 Russia

We compared the potential phenotypic properties of coryneform bacteria associated with chronic prostatitis syndrome （CPs）, such as secretory inhibitor of lysozyme （sIL） and secretory inhibitor of platelet microbicidal protein （sIPMP）. A total of 110 clinical isolates of coryneform bacteria isolated from the seminal fluid of healthy men and men with CPs were tested. sIPMP production was tested by inhibiting platelet microbicidal protein （PMP） bioactivity against bacillus subtilis, and was expressed as percentage of inhibition of PMP bactericidal activity. sIL production was tested by inhibiting lysozyme activity against Micrococcus lysodeikticus and was expressed in microgram per millilitre of inactivated lysozyme. A significantly higher proportion of CPs strains （58.7% vs. 19.2 %） was sIPMP-positive compared with non-CPs strains （P 〈 0.01）. Of the CPs strains tested, 77.8% were sIL-positive compared with 34% of the non- CPs isolates （P 〈 0.05）. These results suggest that the diagnosis of CPs should not rely solely on classical parameters, for example, the identification and counting of microorganisms, but the functional significance of these parameters must be estimated, possibly by the concentration of different bacterial substrains, detection of opportunistic microorganisms with pathogenic properties, such as pronounced resistance to the cationic antimicrobial peptides, and/or the ability to inhibit the antimicrobial host defence factors.

关键词： Corynebacterium spp lysozyme platelet microbicidal protein prostatitis

sYNTHEsEs OF DITOPIC RECEPTOR MACROCYCLEs

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Chinese Chemical Letters 1996年第6期7卷 535-538页

作者： Zhao, b Wu, YJ Tao, JC Yuan, HZ ZHENGZHOU UNIV DEPT CHEMZHENGZHOU 450052PEOPLES R CHINA ACAD sINICA WUHAN INST PHYSLAB MAGNET RESONANCEWUHAN 430071PEOPLES R CHINA

six kinds of new ditopic receptor macrocycles were synthesized by the condensation of 1,10-bis(4-formylphenyl)-1,4,7,10-tetraoxadecane or 1,10-bis(4-formyl-2-methoxyphenyl)-1,4,7,10-tetraoxadecane with polyamines. The... 详细信息

关键词： MOLECULE

Application of experimental design in optimization of crude oil adsorption from saline waste water using raw bagasse

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Journal of Central south University 2014年第2期21卷 684-693页

作者： M.behnood b.Nasernejad M.Nikazar Department of Chemical Engineering Amirkabir University of Technology (Tehran Polytechnic)Mahshahr Campus Food Process Engineering and biotechnology Research Center Amirkabir University of Technology(Tehran Polytechnic)

Experimental design was applied in the optimization of crude oil adsorption from saline waste water using raw *** application of response surface methodology(RsM) was presented with temperature,salinity of water,pH,adsorbent dose,and initial oil content as factors.A quadratic model could be used to approximate the mathematical relationship of crude oil removal on the five significant independent *** values and experimental values are found to be in good agreement with R2 of 97.44%.The result of optimization shows that the maximum crude oil removal is equal to 67.38% under the optimal condition of temperature of 46.53 °C,salinity of 37.2 g/L,pH of 3,adsorbent dose of 9 g/L and initial oil content of 300×10-6.

关键词： brine crude oil adsorption raw bagasse experimental design

solid-particle erosion behavior of cast alloys used in the mining industry

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International Journal of Minerals,Metallurgy and Materials 2015年第12期22卷 1283-1292页

作者： s.Hakan Atapek sinan Fidan Metallurgical and Materials Engineering Kocaeli University school of Civil Aviation Kocaeli University

The erosive-wear response of five commercial ferrous-based cast alloys used for crushing was examined in this study. The micro- structures of the alloys were modified to elucidate the effect of microstructural features on wear. Erosion tests were conducted using alumi- num oxide particles （90-125μm） at 70 m/s and a normal impact angle （90°）. The worn surfaces were characterized by scanning electron microscopy and 3D non-contact laser profilometry. It is found that （i） a pearlitic structure exhibiting a greater plastic deformation than both bainitic and martensitic structures shows the greatest resistance to erosive wear at normal impact and （ii） the fracture characteristics of carbide and graphite particles plays an important role in determining the erosion wear behavior of the cast alloy matrices.

关键词： mining tools microstructure solid particle impact erosion characterization

Evaluation of reclaimed asphalt pavement binder stiffness without extraction and recovery

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Journal of Central south University 2011年第4期18卷 1316-1320页

作者：马涛黄晓明 U.b.Hussain school of Transportation Southeast University Department of Civil and Environmental Engineering University of Wisconsin-Madison

A new testing procedure to estimate the low-temperature stiffness of the reclaimed asphalt pavement （RAP） binder was developed. In the testing procedure, the superpaveTM bending beam Rheometer （bbR） with special modifications and binder blending charts by Asphalt Institute were utilized. Modifications involved the development of a new kind of sample mold and different testing parameters were made to bbR testing procedure to capture the theological properties of bitumen mortars produced by mixing fresh binder with fine RAP materials or RAP aggregate. The stiffness relationship between binder and bitumen mortar was established based on the bbR test results. The blended binder stiffness in bitumen RAP mortar was estimated from the RAP mortar stiffness based on the binder-mortar relationship. And finally, the RAP binder stiffness was estimated from the blended binder and fresh binder stiffness based on the blending charts by Asphalt Institute. The results indicate that the new procedure can capture the rheological properties of bitumen mortar and can be used to estimate the low temperature stiffness of RAP binder without binder extraction and/or any chemical treatments.

关键词： aged binder reclaimed asphalt pavement mortar stiffness bending beam Rheometer blending chart

Threshold Chloride Concentration for Passivity breakdown of Mg-Zn-Gd-Nd-Zr Alloy (EV31A) in basic solution

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Acta Metallurgica sinica(English Letters) 2017年第4期30卷 352-366页

作者： Jakraphan Ninlachart Krishnan s. Raja Chemical and Materials Engineering University of IdahoMoscow ID 83844-1021 USA

Mg-Zn-Gd-Nd-Zr alloy （EV31A） is a heat-treatable magnesium （Mg） cast alloy that can be used up to 200 ℃ for automobile and aerospace applications. This alloy has excellent mechanical properties （ultimate tensile strength： 280 MPa at room temperature, and -230 MPa at 200 ℃） and improved corrosion resistance. Electrochemical corrosion studies were conducted on this alloy under different heat treatment conditions in 0.1 M NaOH solution with the addition of 0-1000 ppm of chloride. The alloy showed excellent passivity in the 0.1 M NaOH solution. The passive potential range typically extended to more than 1.2 VAg/AgCl. The transpassive potential was observed to be dependent on heat treatment condition of the alloy. More than 80 ppm of chloride was required to induce passivity breakdown in any heat treatment condition. Peak aging at 200 ℃ for 16 h imparted better resistance for localized corrosion than other heat-treated con- ditions. The alloy in the as-received condition showed the highest passivation kinetics due to its smaller grain size that possibly increased the diffusion of reactive elements to form protective oxide. The passive film of the EV31A alloy showed n-type semiconductivity with a charge carrier density of - 2 × 10^21 cm^- 3 with no chloride addition. The charge carrier density increased with chloride addition in the electrolyte which could be correlated with the susceptibility to localized corrosion.

关键词： Magnesium alloy Corrosion Passivation Chloride