Thematische Bibliographien / Semi-solid phase

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Auswahl der wissenschaftlichen Literatur zum Thema „Semi-solid phase“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 7. Februar 2022

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Zeitschriftenartikel zum Thema "Semi-solid phase"

Uhlén, Mathias, Thomas Hultman, Johan Wahlberg, Joakim Lundeberg, Staffan Bergh, Bertil Petterson, Anders Holmberg, Stefan Ståhl und Tomas Moks. „Semi-automated solid-phase DNA sequencing“. Trends in Biotechnology 10 (1992): 52–55. http://dx.doi.org/10.1016/0167-7799(92)90169-v.

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Hu, Xiao Gang, Qiang Zhu, Helen V. Atkinson, Min Luo, Fan Zhang und Wen Ying Qu. „Application of Multiphase Modelling in Semi-Solid Die Casting: Blister Prediction“. Solid State Phenomena 256 (September 2016): 139–45. http://dx.doi.org/10.4028/www.scientific.net/ssp.256.139.

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One-phase modelling is widely used as an optimization and design tool for semi-solid casting process. By this approach, semi-solid alloy is taken as a homogeneous fluid and flow behaviours are represented by using the rheological properties of the mixture. A single set of conservation equations is solved to simulate the mould filling, without considering the different motilities between the liquid and the solid phase. Therefore, defects due to phase segregation cannot be predicted and particle tracking cannot be carried out. This study is focused on multiphase (i.e. a liquid-particle-air system) modelling during the semi-solid filling process of a thin-walled component. By using this approach, the solid phase is treated as a power law fluid and the phase interactions among the phases are introduced for the semi-solid alloy system. Practical semi-solid die casting is carried out for verification of phase segregation. The final distribution of air is calculated and proved by practical blistering examination. The simulation results are verified to be accurate in a reasonable range, indicating an approach for modelling semi-solid filling including the formation (and avoidance) of blisters.

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Liu, Zhao Ming, Xin Wang, Ying Bo Zhang und Hong Gao. „Effects of Semi-Solid Isothermal Treatments on Microstructures of Quasicrystal Reinforced AZ91 Alloys“. Advanced Materials Research 430-432 (Januar 2012): 551–55. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.551.

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The as-cast and semi-solid microstructures of quasicrystal reinforced AZ91 alloys were investigated. The results show that the main phases of as-cast AZ91ZY1 and AZ91ZY2 alloys are all α-Mg, I-phase, Mg17Al12 and Al2Y phase. The grain boundary phases contents increase with increasing Y and Zn contents. The better semi-solid processing technological parameters of AZ91ZY1 and AZ91ZY2 alloys are 580 °C, 30 min and 560 °C, 30 min respectively. The better semi-solid processing temperature of AZ91ZY2 alloy is lower than the one of AZ91ZY1 alloy is mainly attributed to the higher contents of the grain boundary phases in the AZ91ZY2 alloy.

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Liu, Zheng, und Xiao Mei Liu. „Study on Fractal Characteristics of Primary Phase Morphology in Semi-Solid A356 Alloy“. Advanced Materials Research 139-141 (Oktober 2010): 653–56. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.653.

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Semi-solid A356 slurry was prepared by compound process, and the fractal characteristic of primary phase morphology was researched. The fractal dimensions of primary phase morphology in semi-solid A356 alloy were calculated by the calculating program written to calculate the fractal dimensions of box-counting in the imagine of morphology of semi-solid primary phase in A356 alloy. The results indicated that the primary phase morphology in semi-solid A356 prepared by compound process is characterized by fractal dimension, and the primary phase morphology prepared by the different technology parameters had different fractal dimensions. The primary phase morphology at the different position of ingot had the different fractal dimensions, which reflected the effect of solidified conditions at different position in the same ingot on the morphology of semi-solid primary phase

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Li, Nai Yong, Han Xiao, Chi Xiong, De Hong Lu und Rong Feng Zhou. „Microstructure of Semi-Solid Extruded Copper Alloy after Heat Treatment“. Solid State Phenomena 285 (Januar 2019): 146–52. http://dx.doi.org/10.4028/www.scientific.net/ssp.285.146.

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The semi-solid extruded ZCuSn10P1 copper alloy were annealed at different temperatures and time. The influences of heat treatment temperature and holding time on the microstructure of semi-solid ZCuSn10P1 copper alloy were investigated. The results show that with the increase of heat treatment temperature, the morphology of the semi-solid microstructure was improved, the sharp angle around the primary phase α-Cu and the liquid droplets were reduced. With the increase of heat treatment time, the solid-liquid segregation of the semi-solid structure was improved. The average grain size of the solid phase increased with the increasing of the holding time. After heat treatment, the solid solubility of the primary phase α-Cu increased, and the Sn and P elements in the liquid phase continued to diffuse to the primary phase α-Cu. The microstructure of semi-solid copper alloy was the most uniform after heat treatment at 350°C for 120 min.

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Yang, Xiang Jie, Ming Wang, Liang Sheng Ding, Hong Min Guo und Xu Bo Liu. „Squeeze Casting of Semi-Solid A356 Alloy“. Solid State Phenomena 217-218 (September 2014): 436–41. http://dx.doi.org/10.4028/www.scientific.net/ssp.217-218.436.

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the rheo-squeeze casting (Rheo-SQC) combining the rheocasting and the SQC was developed, in which semi-solid slurry was produced by the low superheat pouring with a shearing field (LSPSF) process. The three dimensional morphology of the primary α-Al phase and the rest spacing of slurry prepared by LSPSF process have been reconstructed and visualized, and the microstructures of squeeze cast A356 alloy have been obtained. Based on the three dimensional microstructure reconstructed, their three dimensional characterizations such as solid volume fraction, equivalent diameter of the extracted primary α-Al phase were measured and calculated, and the microstructures of cross section of squeeze cast product were investigated.

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Krchňák, Viktor. „Semi-automated high throughput combinatorial solid-phase organic synthesis“. Biotechnology and Bioengineering 61, Nr. 3 (1999): 135–41. http://dx.doi.org/10.1002/(sici)1097-0290(1998)61:3<135::aid-cc1>3.0.co;2-s.

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Koeune, R., und Jean Philippe Ponthot. „A One Phase Thermomechanical Model for Semi-Solid Thixoforming“. Solid State Phenomena 141-143 (Juli 2008): 629–35. http://dx.doi.org/10.4028/www.scientific.net/ssp.141-143.629.

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In order to model thixoforming processes, previous papers presented a thermomechanical one-phase modelling. This first version of constitutive model revealed several limitations: the model could not degenerate properly to pure solid or liquid behaviour neither to free solid suspensions. The aim of this paper was to propose solutions to overcome these limitations.

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Kang, Suk Won, Dock Young Lee und Ki Bae Kim. „Effect of Isothermal Holding Temperature on Globularization of Primary Solid Phase in Multiplex-Type Slurry Cup“. Solid State Phenomena 116-117 (Oktober 2006): 239–42. http://dx.doi.org/10.4028/www.scientific.net/ssp.116-117.239.

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In order to produce a high quality and cost effective part in the rheocasting process for an automobile industry it has been important to develop a slurry-on-demand process, which can manufacture the semi-solid slurry having a fine and globular structure of primary solid phase. The morphology of primary solid phase of semi-solid slurry is coarsened and globularized during an isothermal holding process in a solid-liquid region. Accordingly, in this paper, the microstructural evolution of semi-solid slurry during the isothermal holding at a various temperature in solid-liquid region was investigated to examine a coarsening and globularization behavior of primary solid phase. The semi-solid slurry of Al alloy was produced in a slurry maker using a multiplex-type slurry cup that we developed recently. A size of primary solid phase was the finer at the higher holding temperature, but under a constant holding time a roundness degree of primary solid phase was the lower at the lower holding temperature. Also, a coarsening rate of primary solid phase was not considered to be affected significantly by a holding temperature even though a little lower coarsening rate was obtained at the higher holding temperature.

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Wang, Jia, De Hong Lu, Han Xiao, Rong Feng Zhou, Rong Zhou und Long Biao Wu. „Effect of Rolling-Remelting SIMA Process on Semi-Solid Microstructure of ZCuSn10 Alloy“. Solid State Phenomena 217-218 (September 2014): 418–25. http://dx.doi.org/10.4028/www.scientific.net/ssp.217-218.418.

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Semi-solid billet of ZCuSn10 (Wt%: 88.25Cu, 10.48Sn) alloy is prepared by strain induced melt activated (SIMA) method which including rolling and remelting process. Firstly, ZCuSn10 alloy is casted, and rolling samples are cut from ingot casting. Secondly, the rolling samples are two pass or four pass rolled after holding 15 minutes at 450°C, then samples with 10% and 20% pre-deformation degree are obtained. The remelting samples are cut from pre-deformed samples. Lastly, the remelting samples are reheated up to 850°C or 875°C, water quenching after holding for 15 minutes. Then semi-solid microstructure of ZCuSn10 alloy is prepared. The semi-solid microstructure of ZCuSn10 alloy is observed and compared with annealed microstructure and microstructure of ZCuSn10 alloy directly remelted after casting. The results indicate that semi-solid microstructure of ZCuSn10 alloy by rolling-remelting SIMA process is uniform and fine grain, and spheroidization level of solid particle is well. The optimum semi-solid microstructure is obtained when alloy with pre-deformation 20% is remelted at 875°C for 15 minutes, the average grain diameter is about 75.80μm, shape factor is 1.62, and volume fraction of liquid phase reaches about 17.28%. Pre-deformation process plays a crucial role in grain refinement and spheroidization during SIMA process for preparing the semi-solid ZCuSn10 alloy, as pre-deformation degree and remelting temperature increases, volume fraction of liquid phase increases, the solid particles in semi-solid microstructure are smaller and rounder. The main mechanism of SIMA process preparing semi-solid billet of ZCuSn10 alloy is that pre-deformation breaks dendrites and stores energy of deformation into alloy, and promotes dendrites fusing through remelting process. Meanwhile, liquid phase occupies sharp corners of solid particles by Sn element diffusing from liquid phase into α solid phase, so that fine and uniform and globular α solid particles are gained.

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Dissertationen zum Thema "Semi-solid phase"

Dogan, Eylem. „Two-phase Anaerobic Digestion Of Semi-solid Organic Wastes“. Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609280/index.pdf.

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The objective of this study is to illustrate that phase separation improves the efficiency of an anaerobic system which digests semi-solid organic wastes. Organic fraction of municipal solid waste (OFMSW) was the semi-solid organic waste investigated. In the first part of the study, the optimum operational conditions for acidified reactor were determined by considering the volatile solid (VS) reductions and average acidification percentages at the end of two experimental sets conducted. Organic loading rate (OLR) of 15 g VS/L.day, pH value of 5.5 and hydraulic retention time (HRT) of 2 days were determined to be the optimum operational conditions for the acidification step. Maximum total volatile fatty acid and average acidification percentage were determined as 12405 mg as HAc/L and 28%, respectively in the reactor operated at optimum conditions. In the second part, an acidification reactor was operated at the optimum conditions determined in the first part. The effluents taken from this reactor as well as the waste stock used to feed this reactor were used as substrate in the biochemical methane potential (BMP) test. The results of BMP test revealed that the reactors fed by acidified samples indicated higher total chemical oxygen demand (tCOD) removals (39%), VS reductions (67%) and cumulative gas productions (265 mL). The result of this study indicated that the separation of the reactors could lead efficiency enhancement in the systems providing that effective control was achieved on acidified reactors.

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Berkemeier, Thomas [Verfasser]. „Multiphase kinetics of molecular diffusion, phase transitions and chemical reactions in liquid, semi-solid and glassy organic aerosols / Thomas Berkemeier“. Mainz : Universitätsbibliothek Mainz, 2016. http://d-nb.info/110977527X/34.

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Klepárníková, Eliška. „Interakce poloroztavené slitiny s pevným materiálem při vzájemném pohybu“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-442481.

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This thesis is deals with the suitability of Ag-Sn-Sb alloy for extrusion and selection of suitable materiál for the extruder nozzle. The theoretical part of this thesis deals with the general possibilities of 3D metal printing, especially the metal printing in the semi-solid phase and with it‘s problems. The experimental part describes the development of semi-solid alloys testing device and the research od the alloy and its interactions with solid materials in mutual motion. Analyzis of mechanical and chemical influence between alloy and solid material were performed by visual investigation and analysis of elements by EDS detector. The results of these analyzes led to the choise of nozzle material suitable for extrusion of Ag-Sn-Sb alloy.

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Ruiz, Preciado Marco Alejandro. „Synthèse, caractérisation et réponse photocatalytique des oxydes semi-conducteurs à base de NiTiO3“. Thesis, Le Mans, 2016. http://www.theses.fr/2016LEMA1037/document.

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Structures semi-conductrices à base de NiTiO3, et l'étude de leurs propriétés dans le but de les appliquer en photocatalyse. Une étude théorique et des simulations numériques ont été effectuées pour analyser les propriétés électroniques, vibrationnelles et optiques de NiTiO3 massif ou sous forme de clusters nanométriques. Les poudres NiTiO3 ont été synthétisées par sol-gel par réaction en phase solide, tandis que les films minces ont été obtenus par pulvérisation cathodique rf-magnétron. Les caractérisations de leurs propriétés physiques confirment l'obtention de NiTiO3 polycristallin dans sa phase ilménite. La détermination du gap électronique à 2,25 eV suggère la faisabilité de mise en oeuvre des matériaux synthétisés comme photocatalyseurs actifs sous irradiation en lumière visible. Cette fonctionnalité a été testée par la dégradation du bleu de méthylène en solution aqueuse en utilisant les couches minces de NiTiO3 sous irradiation visible, atteignant la dégradation de 60% de la concentration initiale du colorant en 300 minutes. En outre, l'électro-oxydation du méthanol a été réalisée en appliquant une tension externe sur une électrode contenant des poudres NiTiO3 dans des milieux alcalins. Les ions de Ni présents dans le catalyseur ont été identifiés comme des espèces actives et que l'oxydation des molécules organiques se produit sur la surface des sites de Ni3+. En résumé, NiTiO3 a été synthétisé sous forme de poudres et de films minces ayant des caractéristiques appropriées pour la photocatalyse hétérogène efficace et les capacités catalytiques de NiTiO3 ont été démontrées sur la photodégradation du bleu de méthylène et l'électrooxydation de méthanol
The thesis work is devoted to the synthesis of NiTiO3-based semiconductive structures, i.e. powders and thin films, and the investigation of their related properties with the aim of their applications in photocatalysis. Theoretical approach and numerical simulations of the electronic, vibrational and optical properties of bulk and nanosized NiTiO3 structures have been carried out in order to deepen the understanding of the experimental results. The synthesis of NiTiO3 powders has been achieved by sol-gel and solid state reaction, while NiTiO3 thin films have been grown by rf-sputtering.Characterizations on their structural, vibrational and optical properties confirm the stabilization of polycrystalline NiTiO3 in its ilmenite phase in both powders and thin films as well. The determination of a band gap at 2.25 eV suggests the feasibility to implement the synthesized materials as visible-light-active photocatalysts. This feature has been tested in thedegradation of methylene blue in aqueous solution using rf-sputtered NiTiO3 thin films irradiated with visible light,achieving the degradation of 60% of the initial concentration of the colorant in 300 minutes. In addition, the electro-oxidation of methanol has been accomplished by applying an external voltage on an electrode containing NiTiO3 powders in alkaline media. The Ni ions present in the catalyst have been identified as the active species with the oxidation of the organic molecules on the surface of Ni3+ sites. As a main achievement, NiTiO3 has been synthesized as powders and thin films with suitable characteristics for efficient heterogeneous photocatalysis and the catalytic capabilities of NiTiO3 have beendemonstrated on the photodegradation of Methylene Blue and the electro-oxidation of methanol

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Parsons, Andrew Desmond. „Phase-periodic transport phenomena in hybrid semi-metallic-super conducting nanostructures“. Thesis, Royal Holloway, University of London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271441.

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Santos, Jorge. „Al-7Si-Mg semi-solid castings – microstructure and mechanical properties“. Licentiate thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Material och tillverkning, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-38693.

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The vehicles industry is facing increasing demands for fuel efficiency and cost reduction due to environmental legislation, sustainability and customer demands. Therefore, there is a great need to develop and produce lightweight components by using materials and processes that offer higher specific strength and/or design optimization. Semi‐solid aluminium casting offers design freedom and castings with lower shrinkage and gas entrapment defects compared to high pressure die castings. The lack of understanding of microstructure and defect formation, and design data, for semi‐solid castings is a barrier for foundries and designers in the vehicles industry to use semi‐solid castings. In this study, the effect of two grain refiners on slurry formation and surface segregation of semi‐solid Al‐7Si‐0.3Mg castings produced by the Rheometal™ process was evaluated. The influence of grain refinement on primary α‐Al grain size, shape factor and solid fraction was analysed in addition to the solute content of the surface segregation layer. The influence of magnesium on the formation of intermetallic phases during solidification and the heat treatment response of Al‐7Si‐Mg semi‐solid castings was investigated. The magnesium content was varied from 0.3 to 0.6wt.% and the semi-solid castings were analysed in the T5 and T6 conditions. Energy dispersive spectroscopy was used to identify the intermetallic phases formed during solidification. Tensile testing was performed and the results were correlated to the magnesium and silicon concentration measured in the interior of the α‐Al globules formed during slurry preparation. The results suggest that the addition of grain refiner decreases the solid fraction obtained in the Rheometal™ process. However, no significant effect was observed on the α‐Al grain size and shape factor. A good correlation was obtained between the magnesium concentration in the interior of the α‐Al globules formed during slurry preparation and the offset yield strength for all alloys. The low magnesium solubility in α‐Al at temperatures in the solidification range of the Al‐7Si‐Mg alloys is suggested to be the reason for the low hardening response for the T5 heat treatment compared to the T6 condition.

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Silva, M. P. „Oxidation of Aluminium-Magnesium alloys at elevated temperature in the solid, semi-liquid and liquid states“. Thesis, Brunel University, 1987. http://bura.brunel.ac.uk/handle/2438/5417.

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Sensitive thermogravimetric equipment was used to monitor the oxidation rates of A1-1 to 9% Mg alloys in 0.21 oxygen/0.79 helium mixtures with and without 0.03 atm water vapour pressure, in the temperature range 500-725°C which include their respective solid, semi-liquid and liquid states. These measurements were supported by structural and topographical studies of oxide films using SEM, X-ray diffraction, and TEM with electron diffraction and EDX techniques. The objective was to provide information in the context of dross formation during melting operations. The only oxidation product observed was MgO. The oxidation rates do not follow simple rate laws. The rate normally increases as the temperature is raised except for a curious inverse relationship for liquid alloys just above the liquidus temperatures due to the formation of undulating surfaces. An amorphous MgO film formed on liquid alloys restricted the initial oxidation but, following an incubation period, crystallisation of the film induced breakaway oxidation. The crystallisation was promoted by high magnesium contents, high temperatures and moist atmospheres. The oxidation rates for alloys in the semi-liquid state were as follows: (i) for < 50% liquid, the rates were faster than those for wholly solid alloys due to preferential oxidation of magnesium-enriched liquid fractions along grain boundaries; (ii) for > 50% liquid, the rates were initially faster than those for wholly liquid alloys due to the presence of solid phase particles which acted both as disruptive stress-raisers and as sources of nuclei for crystallisation of the amorphous oxide film over the liquid phase. For the moist atmosphere: (i) wholly solid alloys and semi-liquid alloys with < 50% liquid oxidised initially faster but eventually slower than in the dry atmosphere. These effects are explained by enhanced initial oxidation but suppressed subsequent nucleation of tertiary MgO particles and by the injection of OH - ions into the oxide; (ii) wholy liquid alloys and semi-liquid alloys with > 50% liquid oxidised faster than in the dry atmosphere because of the injection of OH- ions into the oxide with consequent disruptive effects caused by hydrogen absorption by the alloy. The addition of 0.003% Be to Al-8% Mg alloy decreased the oxidation rate markedly by toughening the MgO films preventing cracking and hence the nucleation of tertiary MgO. Small additions of Mn or Zr offset the effect of Be and probably enhanced the Mg 2+ ion conductivity in the oxide by the 4+ injection of Mn 2+ , Mn 4+ or Zr ions. For alloys with Be, although breakaway eventually occurred it was not initiated by crystallisation of the amorphous film and moisture in the atmosphere increased the oxidation throughout the temperature range, 500-725°C.

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恵子, 名取, und Keiko Natori. „微細複合組織金属の変形機構および塑性加工性に関する研究“. Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12867122/?lang=0, 2014. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12867122/?lang=0.

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ヘテロ構造組織を有する鉄・非鉄金属の組織形態に注目して,微視的構造やその挙動が巨視的現象(変形特性,成形性)として発現するメカニズムを解明することを目的とした.鉄系金属ではDual Phase型高張力鋼のスプリングバック現象のひずみ速度依存性,非鉄系金属では半凝固鋳造法と強ひずみ加工を組み合わせた亜共晶アルミニウム合金の衝撃後方押出し成形性に注目した.これらの検討によりいずれの試料においても,結晶粒界よりもスケールの大きいヘテロ構造に由来した変形機構が支配的であることが明らかになった.
博士(工学)
Doctor of Philosophy in Engineering
同志社大学
Doshisha University

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Che, DerShyr, und 陳得時. „Ⅰ. A study on semi-continuous microwave process for removal of heavy metals in fly ash from municipal solid waste (MSW) incineratorⅡ. Determination of lead content in blood by solid phase microextraction/gas chromatography (SPME-GC)“. Thesis, 2001. http://ndltd.ncl.edu.tw/handle/50499512263392237062.

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碩士
淡江大學
水資源及環境工程學系
89
Ⅰ. A study on semi-continuous microwave process for removal of heavy metal in fly ash from municipal solid waste (MSW) incinerator The incineration was wildly used in the pretreatment of the municipal solid waste ( MSW ). But the incinerated fly ash contained heavy metals, and considered to be harmful material. The purpose of this study is to extract heavy metal in fly ash from municipal solid waste (MSW) incinerator using microwave. The traditional leaching or shaking method was used to remove the heavy metals in fly ash . The whole processes were time-consuming. In this study, the microwave extraction methods was presented, and the extraction time was decreased to minites. The dilute HCl solution was as an extraction reagent to extract the fly ash, and the experiments were designed to use mix level orthogonal array to find the optimized extracting condition. The optimized conditions were microwave power: 546 W; extract time, 25 sec; extracting solution, 0.3 M HCl; solid / liquid ratio, 1 / 20. The results showed that the removal rate of metals were 89.6% of Pb, 97.2% of Cu, 79.1% of Zn, 92.8 of Cd in fly ash by the microwave extraction treatment. Ⅱ. Preliminary determination of lead content in blood by solid phase microextraction/gas chromatography (SPME-GC) Traditional method for the determination of lead in whole blood was by graphite furnace atomic absorption spectrometry. The purpose of this study was to optimize the extracting procedure for determination of lead in whole blood by SPME-GC with flame ionization detector (FID). The solution 0.1% Triton-X100 was used to release lead from the erythrocytes. Corpuscles and protein were precipitated by adding 10% trichloracetic acid. The four factors of mix level orthogonal array design for SPME were used in this work and found the following conditions to be optimal: sample pH, 4.0 and 1M acetic acid buffer volume, 1 mL (pH 4.0); extraction time,15 mins; 2% sodium tetraethylborate (STEB) solution,0.2ml; with SPME fiber, 100m poly(dimethylsiloxane)(PDMS). The lead ion was first derivatized with STEB to form tetraethyllead, which is then absorbed on SPME fiber in the headspace over the sample. After sampling, the fiber was withdrawn into the needle and the SPME device was transferred to the GC. The needle in the SPME device is introduced into the GC injector which the absorbed analytes are thermally desorbed and delivered to the GC column,5% phenyl 95% dimethyl-polysiloxame (30m×0.25mm I.D×0.25m, DB-5 MS), and finally organic lead was detected by FID. The conecntration of lead blood was found, 5.96 ug / dL

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Drvarov, Oliver [Verfasser]. „Comparison of two GC-MS-based screening methods in systematic toxicological analysis : acid hydrolysis and liquid-liquid extraction versus acid hydrolysis and solid-phase extraction with a particular focus on manual versus semi-automated data evaluation / vorgelegt von: Oliver Drvarov“. 2008. http://d-nb.info/1002933617/34.

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Bücher zum Thema "Semi-solid phase"

United States. National Aeronautics and Space Administration., Hrsg. Cellular solidification of transparent monotectics: Semi-annual report. [Washington, DC: National Aeronautics and Space Administration, 1986.

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Buchteile zum Thema "Semi-solid phase"

Koeune, R., und Jean Philippe Ponthot. „A One Phase Thermomechanical Model for Semi-Solid Thixoforming“. In Solid State Phenomena, 629–35. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908451-59-0.629.

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Hallstedt, B. „Use of Calphad Thermodynamics to Simulate Phase Formation during Semi-Solid Processing“. In Solid State Phenomena, 641–46. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908451-59-0.641.

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Kang, Suk Won, Ki Bae Kim, Dock Young Lee, Jung-Hwa Mun und Eui Pak Yoon. „Effect of Pouring Temperature and Holding Time at Semi-Solid Region on the Morphology of Primary Solid Phase in Semi-Solid Slurry“. In Materials Science Forum, 782–85. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-995-4.782.

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Kang, Suk Won, Ki Bae Kim, Dock Young Lee, Jung-Hwa Mun und Eui Pak Yoon. „Morphological Evolution of Primary Solid Phase in Semi-Solid Slurry during the Isothermal Holding“. In Materials Science Forum, 394–97. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-995-4.394.

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Kang, Suk Won, Dock Young Lee und Ki Bae Kim. „Effect of Preheating Temperature of Multiplex-Type Slurry Cup on the Morphology of Primary Solid Phase of Semi-Solid Slurry“. In Solid State Phenomena, 332–35. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908451-26-4.332.

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Pineau, Frédéric, und Geneviève Simard. „Investigation of the Primary Phase Segregation during the Filling of an Industrial Mold with Semi-Solid A357 Aluminum“. In Solid State Phenomena, 635–40. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908451-59-0.635.

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Tuan, Nguyen Anh, Dao Van Luu und Lai Dang Giang. „Optimization of Processing Parameters of Primary Phase Particle Size of Cooling Slope Process for Semi-solid Casting of ADC 12 Al Alloy“. In Lecture Notes in Civil Engineering, 49–61. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0945-9_4.

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Ajji, A., und M. M. Dumoulin. „Rolling and Roll-Drawing of Semi-Crystalline Thermoplastics“. In Solid Phase Processing of Polymers, 258–95. München: Carl Hanser Verlag GmbH & Co. KG, 2000. http://dx.doi.org/10.3139/9783446401846.007.

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Bokoch, S. M., und Valentin A. Tatarenko. „A Semi-Empirical Parameterization of Interatomic Interactions Based on the Statistical-Thermodynamic Analysis of the Data on Radiation Dif-fraction and Phase Equilibria in F.C.C.-Ni–Fe Alloys“. In Solid State Phenomena, 303–18. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908451-49-3.303.

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Macchi, Piero. „Ab Initio Quantum Chemistry and Semi-Empirical Description of Solid State Phases Under High Pressure: Chemical Applications“. In NATO Science for Peace and Security Series B: Physics and Biophysics, 325–39. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9258-8_26.

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Konferenzberichte zum Thema "Semi-solid phase"

Vakili-Nezhaad, G. R., M. Hamedanian und M. Ghomashi. „Calculation of the Heat Capacities of Solid Phase Buckminsterfullerene Using Semi-Empirical Methods“. In NANOTECHNOLOGY AND ITS APPLICATIONS: First Sharjah International Conference on Nanotechnology and Its Applications. AIP, 2007. http://dx.doi.org/10.1063/1.2776681.

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Ogawa, Kyohei, Shinichi Nishida, Shogo Imai, Daichi Uematsu, Makoto Hagiwara, Mizuki Kawawa und Kentaro Tsunoda. „Screw Forming by Semi-Solid Forging of Aluminum Alloy A7075“. In JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/lemp2020-8509.

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Abstract This paper reports the screw forming of aluminum alloy A7075 by semi-solid forging. The experimental devices are a servo press machine and a die cushion. The program motion was used for forging. The nominal diameter of screw is M10. The molten aluminum alloy A7075 was stirred and then semi-solid forged into a female screw under 40 tons with 10 seconds holding during forging. The solid phase rate was 0.3. The microstructure of the specimen that is isometric crystal had sphericalization, and refinement. In the results of compression test at room temperature, the maximum compression rate was 29.4% and the maximum nominal stress was 540 MPa. The screw tightening torque was estimated over 57.55 N · m by torque test. This value indicates for produced M10 screw that the strength is over strength category 8.8 of JIS. These results are indicated that the produced screw is suitable for general applications. In the results of optical observation, the male screw of die transferred to the aluminum forgings. And the surface of screw portion had crack free surface. In summary, screw forming by semi-solid forging of aluminum alloy A7075 was possible.

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Takahashi, Ryohei, und Makoto Yamamoto. „Development and Elaboration of Numerical Method to Simulate Gas-Liquid-Solid Three-Phase Flows Based on MPS Method“. In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-03517.

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In recent years, the utilization of computational fluid dynamics (CFD) in various industrial fields has broadened following developments in computer technology. Although mainstream CFD is currently based on a grid method in an Eulerian framework, it is difficult to apply this to the simulation of problems in which large deformations of interfaces between phases occur or where microscopic scale phenomena have a great influence on the entire flow field. For this reason, particle methods, which can offer advantages for dealing with interface deformations and microscopic scale phenomena, are now receiving attention. Among the various particle methods, the moving-particle semi-implicit (MPS) method [1] is the most well-established and various physical models and extended numerical methods have been developed using it. In this study, we developed a numerical method to simulate a gas-liquid-solid three-phase flow based on the MPS approach. This method makes possible the coupling of independent computations of different phases. We conducted numerical tests on gas-liquid two-phase, liquid-solid two-phase and gas-liquid-solid three-phase simulations. Computational targets are modelling the dam break and solid-particle impingement phenomena. The computational results indicate reasonable agreement with the experimental results. We confirmed that the present method can reproduce the interactions between gas, liquid and solid phases that are difficult to reproduce with conventional grid methods.

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Alavi, S., M. Passandideh-Fard und J. Mostaghimi. „Simulation of Fluid Flow and Heat Transfer Including Phase Change During the Impact of Semi-Molten Particles“. In ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ht2012-58252.

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A numerical method is proposed in this paper which is capable of modeling the impact and deposition of semi-molten particles. By attributing a high viscosity to the solid region, simulating the motion of solid cores including solidification/melting is made possible inside the particle. The Navier-Stokes equations are solved in combination with the Volume-of-Fluid (VOF) technique to track the free surface of the particles. In addition, the heat transfer including phase change is modeled using the enthalpy method. The viscous terms are treated implicitly to relax the restrictions associated with small computational time-steps in explicit formulations. Several case studies with operating conditions of a typical thermal spray process are simulated. These cases include the impact of molten and semi-molten nickel particles in an atmospheric plasma spray process (APS). The effects of various parameters such as particle solid-core diameter, initial velocity and temperature are investigated. The simulations show that the size of the solid core has an important effect on the amount of particle splashing during the impact.

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Zaki, Wael, und Ziad Moumni. „Modeling framework for materials capable of solid-solid phase transformation: application to the analytical solution of the semi-infinite mode III crack problem in an idealized shape memory alloy“. In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, herausgegeben von Wei-Hsin Liao. SPIE, 2015. http://dx.doi.org/10.1117/12.2085291.

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Hamelin, Cory J., Ondrej Mura´nsky, Vladimir Luzin, Philip Bendeich und Lyndon Edwards. „Accounting for Phase Transformations During Welding of Ferritic Steels“. In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57426.

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The numerical application of solid-state phase transformation kinetics relating to conventional welding of ferritic steels is presented. The inclusion of such kinetics in weld models is shown to be necessary for capturing the post-weld residual stress field. To this end, a comparison of two approaches is outlined: a semi-empirical approach that uses thermodynamic transformation kinetics to predict phase morphology; and a fully empirical approach that directly links local material temperature to the present constituent phase(s). The semi-empirical analysis begins with prediction of TTT diagrams using thermodynamic principles for ferritic steels. The data is then converted to CCT diagrams using the Scheil-Avrami additive rule, including austenite grain growth kinetics. This information is used to predict the phases present under varying peak temperatures and cooling rates. In the fully empirical approach, dilatometric experiments of steel samples are performed during heating to simulate expected welding conditions. The constitutive response of the sample is then used as input for the subsequent numerical weld analyses. Input derived from each technique is transferred into weld models developed using the Abaqus finite element package. Model validation is carried out by direct comparison with neutron diffraction residual stress measurements on two beams of SA508 Gr.3 Cl.1 steel subjected to autogenous beam TIG welds under varying torch speeds, heat input and preheat conditions.

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Siahpush, Ali, und John Crepeau. „Integral Solutions of Phase Change With Internal Heat Generation“. In 12th International Conference on Nuclear Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/icone12-49412.

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This paper presents solutions to a one-dimensional solid-liquid phase change problem using the integral method for a semi-infinite material that generates internal heat. The analysis assumed a quadratic temperature profile and a constant temperature boundary condition on the exposed surface. We derived a differential equation for the solidification thickness as a function of the internal heat generation (IHG) and the Stefan number, which includes the temperature of the boundary. Plots of the numerical solutions for various values of the IHG and Stefan number show the time-dependant behavior of both the melting and solidification distances and rates. The IHG of the material opposes solidification and enhances melting. The differential equation shows that in steady-state, the thickness of the solidification band is inversely related to the square root of the IHG. The model also shows that the melting rate initially decreases and reaches a local minimum, then increases to an asymptotic value.

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Crepeau, John C., und Ali Siahpush. „Effects of Internal Heat Generation on Solidification“. In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72079.

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We present solutions for solid-liquid phase change in materials that generate internal heat. This problem is solved for both cylindrical and semi-infinite geometries. The analysis assumes a temperature profile in the solid phase and constant temperature boundary conditions on the exposed surfaces. We derive differential equations governing the solidification thickness for both geometries as functions of the Stefan number and the internal heat generation (IHG). For the cylindrical geometry, the solidification layer obtains a steady-state value which is related to the inverse of the square root of the IHG. The solutions to the semi-infinite geometry problem show that when the surface is cooled to below the freezing point, a solidification layer forms along the edge and begins to grow until it reaches a maximum, then begins remelt.

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Béguin, C., T. Plagnard und S. Étienne. „Wall Proximity and Curvature Effect on Added Mass Forces in Two-Phase Cross-Flow“. In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28461.

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This paper studies the effect of wall proximity and wall curvature on the added mass coefficient of a spherical bubble. Results are based on a semi-analytical method. This information is essential to completely characterize finely dispersed bubbly flows in two-phase cross flow. In such flows small spherical gas bubbles are present in a continuous liquid phase close to a cylinder. This paper uses solid harmonics to solve 3D potential flow around a bubble and a wall. A new technique is developed to calculate the flow potential around a sphere and a cylinder using solid harmonics. Several configurations were calculated: one bubble close to an infinite wall, one bubble close to a cylinder and one bubble close to a spherical wall. Our results are compared with previous studies. As expected added mass forces increase in the vicinity of the wall and for lower curvature. The main purpose of this work is to understand the effect of wall curvature and proximity on added mass. These results are suitable for further use, particularly as added mass models for multiphase flow averaged equations.

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Schomer, Laura, Mathias Liewald und Kim Rouven Riedmüller. „Simulation of the infiltration process of a ceramic open-pore body with a metal alloy in semi-solid state to design the manufacturing of interpenetrating phase composites“. In PROCEEDINGS OF THE 21ST INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2018. Author(s), 2018. http://dx.doi.org/10.1063/1.5034991.

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Berichte der Organisationen zum Thema "Semi-solid phase"

Rice, Chris S. Semi-Solid Metal Freeform Fabrication - Phase I Final Report for Period September 4, 1999--June 14, 2000. Office of Scientific and Technical Information (OSTI), Juli 2000. http://dx.doi.org/10.2172/769242.

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Hawthorne, S. B. Subtask 1.12 - Solid-Phase Microextraction (SPME) Coupled with Optical Spectroscopy for Near-Real-Time Determination of Fuel and Related Pollutants in Water Samples: Semi-annual report, July 1--December 31, 1996. Office of Scientific and Technical Information (OSTI), Dezember 1997. http://dx.doi.org/10.2172/619734.

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Subtask 1.12 -- Solid-phase microextraction (SPME) coupled with optical spectroscopy for near real-time determination of fuel and related pollutants in water samples. Semi-annual report, January 1--June 30, 1996. Office of Scientific and Technical Information (OSTI), Dezember 1996. http://dx.doi.org/10.2172/634164.

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