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EFFECT OF processing parameters ON SUPERCONDUCTING PROPERTIES OF AG-SHEATHED BI-2223 TAPE

CRYOGENICS 1994年第4期34卷 325-328页

作者： VENUGOPAL, K SWAMINATHAN, G Corporate Research & Development Bharat Heavy Electricals Ltd. Vikasnagar Hyderabad-500 593 India

Silver-sheathed tapes were fabricated using a Bi-2223 system. The tapes were processed to their final thickness by direct rolling as well as by repeated rolling with intermediate heat treatment. The rolling reduction rate was also varied to find its effect on the final properties. The critical current J(c) measured at 77 K could be enhanced to 12 500 A cm-2 for repeatedly rolled tapes from 2770 A cm-2, obtained in directly rolled tapes processed under identical conditions. In repeatedly rolled tapes the J(c)-B variations were found to be much lower in comparison to the directly rolled tapes. Texture evaluation using the angular dependence of the magnetoresistance showed the a-b plane orientation to be along the rolling direction.

关键词： BI-2223 TAPES SUPERCONDUCTING PROPERTIES processing parameters

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Influence of Hammer Mill Screen Size on processing parameters and Starch Enrichment in Milled Sorghum

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CEREAL RESEARCH COMMUNICATIONS 2013年第3期41卷 493-499页

作者： Al-Rabadi, G. J. Mutah Univ Dept Anim Prod Fac Agr Al Karak 61710 Jordan

The effect of hammer mill screen size on processing parameters and particle size of milled sorghum were examined. Sorghum grains were ground through two levels of hammer mill screen size: 2 mm and 6 mm and then subsequently fractionated by size on a set of eight sieves ranging from 0.045 mm to 2.8 mm. The objective of this experiment were: i) to characterize the influence of hammer mill screen size (2 and 6 mm) on processing parameters: production output, energy consumption, average particle size (d(gw)), geometric standard deviation (s(gw));ii) to characterize the influence of particle size, after segregation by sieving, on starch enrichment. The results of this study showed that using 6 mm hammer milling screen size has resulted in a significant effect on production output, energy consumption, d(gw) with no effect on s(gw). Different particle sizes, when segregated by sieving, have shown significant effect on starch content. Particle size retained by sieve size 1.7 mm had the highest starch content, whereas particles retained by sieve size 0.125 mm had the lowest, which suggest potential applications in ruminant and monogastric nutrition.

关键词： sorghum particle size mill processing parameters

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Controlled drug release from melt-extrudates through processing parameters: A chemometric approach

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INTERNATIONAL JOURNAL OF PHARMACEUTICS 2015年第1-2期481卷 9-17页

作者： Sarraf, Abraham G. Cherkaoui, Samir Jordan, Olivier Gurny, Robert Doelker, Eric Univ Lausanne Univ Geneva Ecole Pharm Geneve Lausanne Sch Pharmaceut Sci CH-1211 Geneva 4 Switzerland Bracco Suisse CH-1228 Geneva Switzerland

The objective of this study was to tailor a drug release profile through the adjustment of some key processing parameters involved in melt-extrusion: die temperature, shear rate, die length and drug particle size. Two experimental designs were selected, namely a 2-level full factorial design to examine the effects and significance of the processing factors, and a central composite design of the surface responses to find the best set of factor levels to obtain given specifications of drug release. Extrudates of poly(ethylene-co-vinyl acetate) and phenylpropanolamine hydrochloride were prepared using a ram extruder. Drug release profiles from the matrix systems were fitted using a power law, for which a new mathematical expression of a burst release was provided. The burst release and exponent were selected as the responses. The processing factors had a drastic influence on the drug release. Within the domain that was investigated, the burst release and the exponent varied from 6 to 54% and 0.1 to 0.4, respectively, resulting in a time requires for 50% drug release extending from hours to weeks. These results demonstrated the possibilities of modulating the release profile by means of the processing parameters rather than through the classical approach of altering the formulation. (C) 2015 Elsevier B.V. All rights reserved.

关键词： Hot-melt extrusion Poly(ethylene-co-vinyl acetate) Phenylpropanolamine hydrochloride Controlled release Experimental design processing parameters

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Effect of buffalo milk on the yield and composition of buffalo feta cheese at various processing parameters

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FOOD BIOSCIENCE 2016年 15卷 110-117页

作者： Shakerian, Mansour Kiani, Hossein Ehsani, Mohammad-Reza Univ Tehran Fac Agr Engn & Technol Dept Food Sci & Technol Bioproc & Biodetect Lab Campus Agr & Nat Resources Tehran 14174 Iran

The aim of this study was to analyze the composition of Iranian buffalo milk and study the effect of different parameters such as fat content, acidity of milk, starter culture and temperature on the composition of buffalo feta cheese. The feta cheese yields obtained from buffalo milk were higher in comparison with the yields reported for cow milk. Higher yields were obtained when the fat content of the milk was increased. Rise in the raw milk acidity increased the yield and reduced the fat, protein and lactose loses. Thermophilic and mesophilic starter cultures exhibited better activities at 38 degrees C and 34 degrees C, respectively. Pasteurization resulted in significantly (p < 0.05) higher yields, but homogenization did not affect the yield notably (p > 0.05). The results of this study revealed that buffalo milk could be regarded as a good source for the production of feta cheese due to elevated amounts of fat, protein and Ca. The results showed that optimum conditions were needed to achieve the higher yields. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Buffalo milk Feta cheese processing parameters Cheese yield

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Influence of processing parameters and Formulation Factors on the Bioadhesive, Temperature Stability and Drug Release Properties of Hot-Melt Extruded Films Containing Miconazole

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AAPS PHARMSCITECH 2014年第3期15卷 522-529页

作者： Chen, Meiwan Lu, Jiannan Deng, Weibin Singh, Abhilasha Mohammed, Noorullah Naqvi Repka, Michael A. Wu, Chuanbin Sun Yat Sen Univ Sch Pharmaceut Sci GuangDong Res Ctr Drug Delivery Syst Guangzhou 510006 Guangdong Peoples R China Univ Mississippi Sch Pharm Dept Pharmaceut University MS 38677 USA Univ Macau Inst Chinese Med Sci State Key Lab Qual Res Chinese Med Macau Peoples R China

This study investigated the processing parameters and formulation factors on the bioadhesive properties, temperature stability properties, and drug release properties of miconazole in PolyOxA (R) and KlucelA (R) matrix systems produced by Hot-melt Extrusion (HME) technology. Miconazole incorporated into these matrix systems were found to be stable for 8 months by X-ray diffraction (XRD). The addition of miconazole increased area under the curve (AUC) at contact time intervals of 30 and 60 sec, while the bioadhesion decreased with an increase in processing temperatures. The release profiles suggest that a sustained release of miconazole was observed from all of the tested HME film formulations for approximately 10 h. The release from the optimal HME film extruded at 205A degrees C was found to be significantly different than that extruded at 190A degrees C. Therefore, this matrix system may address the present shortcomings of currently available therapy for oral and pharyngeal candidiasis.

关键词： bioadhesive properties formulation factors processing parameters release studies stability properties

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Effects of Solid-State Reaction Synthesis processing parameters on Thermoelectric Properties of Mg_2Si

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Journal of Wuhan University of Technology(Materials Science) 2004年第2期19卷 55-56页

作者：姜洪义 Wuhan University of Technology

The Mg_(2)Si-matrix thermoelectric material was synthesized by low temperature solid-state *** paper studies the effects of holding time and reaction temperature on the particle size and the properties of the material,and also studies effects of doping elemental Sb,Te and their doping seqence on the properties of the *** result shows that excessively high temperature and elongated holding time of solid-state reaction are harmful,there is a range of particle size to ensure optimum properties and the doping sequence of Sb or Te without influencing the properties.

关键词： solid-state reaction processing parameters Mg_2Si based compounds

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Effects of processing parameters on Microstructure and Mechanical Properties of Rheomolded AZ91D Magnesium Alloy

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TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS 2016年第3期69卷 673-682页

作者： Qi, Mingfan Kang, Yonglin Zhou, Bing Zhang, Huanhuan Zhu, Guoming Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China

An advanced rheomolder, equipped with a thin-walled phone cover mold, was introduced and used to manufacture the AZ91D magnesium alloy. Effects of different processing parameters including pouring temperature, cylinder temperature and injection velocity on the microstructure and mechanical properties were investigated. The results showed that, with the decrease of pouring temperature or the increase of injection velocity, the size of alpha(1)-Mg decreases while the sphericity increases, and the porosity fraction reduces, which raise mechanical properties of rheomolded AZ91D. As the cylinder temperature decreases, the size of a1-Mg decreases and the sphericity increases initially and then remains relatively unchanged while the solid fraction increases continuously. Also, the cylinder temperature has a significant effect on mechanical properties of rheomolded AZ91D and the highest mechanical property is obtained at a cylinder temperature of 555 degrees C. The optimal rheomolded AZ91D with tensile strength of 273 MPa and elongation of 7.2 % were obtained at the pouring temperature of 600 degrees C, injection velocity of 2.1 m/s and cylinder temperature of 555 degrees C. Compared with high pressure die-casting, the tensile strength and elongation were increased by 22.4 and 213 %, respectively.

关键词： Magnesium Rheomolded Microstructure Mechanical properties processing parameters

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Influence of processing parameters on quality factors of one-shot hybrid structures made by RTM

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PRODUCTION ENGINEERING-RESEARCH AND DEVELOPMENT 2018年第2期12卷 185-194页

作者： Hergan, Patrick Beter, Julia Stelzer, Steffen Fauster, Ewald Schledjewski, Ralf Univ Leoben Dept Polymer Engn & Sci Proc Composites Grp Otto Glockel Str 2 A-8700 Leoben Austria Univ Leoben Dept Polymer Engn & Sci Mat Sci & Testing Polymers Otto Glockel Str 2 A-8700 Leoben Austria

This paper is dealing with the influence of processing parameters for manufacturing of steel-carbon-fiber-reinforced-plastic (CFRP) hybrid plates by using the one-shot-hybrid resin-transfer-moulding (OSH-RTM) process. A design of experiments study was carried out. The quality of the manufactured parts was quantified by the bending modulus, the apparent interlaminar shear strength (ILSS), the maximum deflection and the density of the CFRP. The following changeable processing parameters were chosen: mould temperature, resin temperature, change in mass flow and maximum injection pressure. It is shown that the mould temperature and the change in mass flow show significant impact on the flexural modulus, density and maximum deflection of the plate while there is no significant impact on the apparent ILSS. Furthermore, the interaction between the mould temperature and resin temperature is having an influence on the flexural modulus and density.

关键词： CFRP-metal hybrid composites Temperature induced deflection processing parameters Resin transfer moulding processing of composite materials

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Effect of processing parameters on the degree of infiltration of SiC_p preforms by Al-Si-Mg alloys

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MATERIALS LETTERS 2003年第26-27期57卷 4332-4335页

作者： Aguilar-Martínez, JA Pech-Canul, MI Rodríguez-Reyes, M De La Peña, JL IPN Ctr Invest & Estudios Avanzados Unidad Saltillo Saltillo 25000 Coahuila Mexico

The effect of the following processing parameters on the degree of infiltration of SiCp preforms by Al-Si-Mg alloys was investigated and quantified: SiC particle size, SiC type and Mg content in the aluminium alloy. These parameters were studied at two levels: 20 and 75 mum, GC and C, and, 3% and 6% Mg, respectively. The contribution of each of the aforementioned parameters and their interactions was determined using analysis of variance and the effect of the levels of each parameter was examined using surface response analysis. Analysis of variance (ANOVA) results show that particle size is the parameter that most significantly impacts the degree of infiltration, followed by magnesium content in the alloy. Surface response analysis shows-that regardless of-the type of SiC,the degree of infiltration increases with increase in magnesium content and that the increase rate in the degree of infiltration is higher for GC-SiC than that for C-SiC. For both SiC particle sizes, the type of SiC has no significant effect on the degree of infiltration;however, GC-SiC enhances infiltration. When using an alloy 3 wt.% Mg in the alloy, SiC particle size slightly affects the degree of infiltration. In contrast, an alloy 6 wt. % Mg significantly affects the degree of infiltration. An increase, in the degree of infiltration with increase in Mg content is observed for both particle sizes;however, in preforms with 75-mum powders, such increment is negligible compared to that for preforms with 20-mum powders. Accordingly, the optimum parameters for maximum degree of infiltration are: 20-mum powders, 6 wt.% Mg in the alloy and GC-SiC. (C) 2003 Elsevier Science B.V. All rights reserved.

关键词： degree of infiltration processing parameters surface response analysis Al-Si-Mg alloys

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Effects of processing parameters on figuration during the GMAW rapid prototyping process

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China Welding 2006年第4期15卷 30-33页

作者：尹玉环胡绳荪张晓博何滨华 Tianjin University Tianjin 300072. Hebei University of Technology Tianjin 300130.

As a deposition technology, gas metal arc welding （GMAW） has shown new promise for rapid prototyping of metallic parts. During the process of metal forming using the arc of GMA W, low heat input and stable droplet transition are critical to high quality figuration. The effects of various processing parameters on figuration quality were studied in the experiment of GMA W rapid prototyping using the wire of ERSO-6 , including welding voltage, wire feeding rate, welding speed and so on. The optimal parameters for ERSO-6 are obtained. Simultaneously, it is verified that the rapid prototyping parts with favorable structures and quality can be achieved under the conditions of low heat input and stable droplet transition.

关键词： rapid prototyping gas metal arc welding processing parameters figuration

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