Relevant bibliographies by topics / Fabrication by ASC

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Academic literature on the topic 'Fabrication by ASC'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "Fabrication by ASC"

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Yuan, Jinzhou, Jessie Zhou, David M. Raizen, and Haim H. Bau. "High-throughput, motility-based sorter for microswimmers such as C. elegans." Lab on a Chip 15, no. 13 (2015): 2790–98. http://dx.doi.org/10.1039/c5lc00305a.

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Liu, Zailun, Zhengyang Zhao, Fei Teng, Chao Chang, Yunxuan Zhao, Yang Yang, Wenqing Yao, Yongfa Zhu, and Yingzheng Fan. "In situ hydrothermal fabrication of a MnO2@CoMoO4@Ni nanohybrid electrode and ultrahigh energy density of ASCs." RSC Advances 6, no. 52 (2016): 46508–15. http://dx.doi.org/10.1039/c6ra05790j.

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Tabassum, Hassina, Chong Qu, Kunting Cai, Waseem Aftab, Zibin Liang, Tianjie Qiu, Asif Mahmood, Wei Meng, and Ruqiang Zou. "Large-scale fabrication of BCN nanotube architecture entangled on a three-dimensional carbon skeleton for energy storage." Journal of Materials Chemistry A 6, no. 42 (2018): 21225–30. http://dx.doi.org/10.1039/c8ta08590k.

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Liu, Di, Seung Hyun Hur, Jin Suk Chung, and Won Mook Choi. "Fabrication of g-C3N4 Quantum Dots/MnCO3 Nanocomposite on Carbon Cloth for Flexible Supercapacitor Electrode." Applied Sciences 10, no. 21 (November 9, 2020): 7927. http://dx.doi.org/10.3390/app10217927.

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In this study, the nanocomposite of g-C3N4 quantum dots/MnCO3 on carbon cloth (q-MC//CC) is prepared via a simple hydrothermal method. The obtained q-MC//CC composite is employed for a flexible supercapacitor electrode. The g-C3N4 quantum dots could effectively improve the interface electrical conductivity and ion transportation of the MnCO3 electrode, which results in superior electrochemical performance. The q-MC//CC electrode delivers a high specific capacity of 1001 F·g−1 at a current density of 1 A·g−1 and a good cycling performance of 96% capacity retention after 5000 cycles. Moreover, an asymmetric flexible supercapacitor (ASC) is assembled with q-MC//CC and carbon cloth as a positive and negative electrode, respectively, which exhibits a high energy density of 27.1 Wh·kg−1 at a power density of 500 W·kg−1. In addition, the fabricated ASC device demonstrates the ability to power the light-emitting diode effectively under mechanical bending.
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Rashidbenam, Zahra, Mohd Hafidzul Jasman, Guan Hee Tan, Eng Hong Goh, Xeng Inn Fam, Christopher Chee Kong Ho, Zulkifli Md Zainuddin, et al. "Fabrication of Adipose-Derived Stem Cell-Based Self-Assembled Scaffold under Hypoxia and Mechanical Stimulation for Urethral Tissue Engineering." International Journal of Molecular Sciences 22, no. 7 (March 25, 2021): 3350. http://dx.doi.org/10.3390/ijms22073350.

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Long urethral strictures are often treated with autologous genital skin and buccal mucosa grafts; however, risk of hair ingrowth and donor site morbidity, restrict their application. To overcome this, we introduced a tissue-engineered human urethra comprising adipose-derived stem cell (ASC)-based self-assembled scaffold, human urothelial cells (UCs) and smooth muscle cells (SMCs). ASCs were cultured with ascorbic acid to stimulate extracellular matrix (ECM) production. The scaffold (ECM) was stained with collagen type-I antibody and the thickness was measured under a confocal microscope. Results showed that the thickest scaffold (28.06 ± 0.59 μm) was achieved with 3 × 104 cells/cm2 seeding density, 100 μg/mL ascorbic acid concentration under hypoxic and dynamic culture condition. The biocompatibility assessment showed that UCs and SMCs seeded on the scaffold could proliferate and maintain the expression of their markers (CK7, CK20, UPIa, and UPII) and (α-SMA, MHC and Smootheline), respectively, after 14 days of in vitro culture. ECM gene expression analysis showed that the ASC and dermal fibroblast-based scaffolds (control) were comparable. The ASC-based scaffold can be handled and removed from the plate. This suggests that multiple layers of scaffold can be stacked to form the urothelium (seeded with UCs), submucosal layer (ASCs only), and smooth muscle layer (seeded with SMCs) and has the potential to be developed into a fully functional human urethra for urethral reconstructive surgeries.
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Kornicka, K., R. Walczak, A. Mucha, and K. Marycz. "Released from ZrO2/SiO2 coating resveratrol inhibits senescence and oxidative stress of human adipose-derived stem cells (ASC)." Open Chemistry 16, no. 1 (May 23, 2018): 481–95. http://dx.doi.org/10.1515/chem-2018-0039.

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AbstractThe rapid aging of the population results in increased number of metabolic and degenerative disorders, especially in the elderly.Thus, a novel approach in the fields of orthopedic and reconstructive surgery for bone regeneration is strongly desirable. A new perspective in the therapy of bone fractures is tissue engineering which combines living cells with biomaterials to develop modern substitutes that can restore tissue functions. Metallic biomaterials, including stainless steel and pure titanium, have been extensively used for the fabrication of surgical implants over decades. Chemical modification of material surface for example incorporation of chemotactic factors may significantly improve the therapeutic effect. In this paper we describe titanium substrate modifications with ZrO2/SiO2 coating functionalized with resveratrol using a sol – gel, dip-coating technique. Moreover, we established the effects of fabricated scaffolds on adipose stem cells isolated from elderly patients. Using fluorescence imaging, polymerase chain reaction (PCR)and cytotoxicity tests, we established that 0.5 Res_ZrO2/SiO2 significantly reduced apoptosis and accumulation of oxidative stress factors in adipose derived stem cells (ASC). Thus exploitation of fabricated biomaterials in regenerative medicine as a strategy for rejuvenate ASC from elderly patients in vivo, seems fully justified.
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Simon Justin, A., P. Vickraman, and B. Joji Reddy. "Investigation on Carbonsphere@Nickel Cobalt Sulfide Core-shell Nanocomposite for Asymmetric Supercapacitor Application." Energy Harvesting and Systems 6, no. 1-2 (September 25, 2019): 1–13. http://dx.doi.org/10.1515/ehs-2019-0003.

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Abstract The carbon sphere (CS)@nickel cobalt sulfide core-shell nanocomposite at five different mole ratios have been synthesized by a facile low-temperature water-bath method without any thermal treatment. The XRD results on CS, NiCo2S4 and its ternary complexation confirms nanocomposite formation which matches with the cubic structure. The FTIR confirms the complexation of CS and metal-sulfide core-shell. TEM morphology shows CS at NiCo2S4 forming a core-shell which appears as interlinked bunch of grapes. The BET surface analysis observes the high surface area for the core-shell. The XPS studies confirm the elemental presence and valence states of metal composition of the core-shell. Electrochemical studies on the pure NiCo2S4 and CS@NiCo2S4 have shown that CS@NiCo2S4 in 1:1 ratio (scn2) only exhibits higher specific capacitance of 838 F g−1 at 1 A g−1 with capacity retention of 89 % for 5000 cycles than other mole ratios. Using this scn2, asymmetric supercapacitor (ASC) device fabrication has been studied. The electrochemical studies on ASC reveal high energy density of 101 Wh kg−1 with the power density of 6.3 k W kg−1, and having good cycling stability with 92 % of capacitance retention even after 3000 cycles at 20 A g−1.
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Kolan, Krishna C. R., Julie A. Semon, Bradley Bromet, Delbert E. Day, and Ming C. Leu. "Bioprinting with human stem cells-laden alginate-gelatin bioink and bioactive glass for tissue engineering." International Journal of Bioprinting 5, no. 2.2 (July 11, 2019): 3. http://dx.doi.org/10.18063/ijb.v5i2.2.204.

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Three-dimensional (3D) bioprinting technologies have shown great potential in the fabrication of 3D models for different human tissues. Stem cells are an attractive cell source in tissue engineering as they can be directed by material and environmental cues to differentiate into multiple cell types for tissue repair and regeneration. In this study, we investigate the viability of human adipose-derived mesenchymal stem cells (ASCs) in alginate-gelatin (Alg-Gel) hydrogel bioprinted with or without bioactive glass. Highly angiogenic borate bioactive glass (13-93B3) in 50 wt% is added to polycaprolactone (PCL) to fabricate scaffolds using a solvent-based extrusion 3D bioprinting technique. The fabricated scaffolds with 12 × 12 × 1 mm3 in overall dimensions are physically characterized, and the glass dissolution from PCL/glass composite over a period of 28 days is studied. Alg-Gel composite hydrogel is used as a bioink to suspend ASCs, and scaffolds are then bioprinted in different configurations: Bioink only, PCL+bioink, and PCL/glass+bioink, to investigate ASC viability. The results indicate the feasibility of the solvent-based bioprinting process to fabricate 3D cellularized scaffolds with more than 80% viability on day 0. The decrease in viability after 7 days due to glass concentration and static culture conditions is discussed. The feasibility of modifying Alg-Gel with 13-93B3 glass for bioprinting is also investigated, and the results are discussed.
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Zhang, Zheng Yan, Ding Fang Chen, Ji Quan Hu, Xiao Ping Wang, and Ping Chen. "Representation and Fabrication Method for Multiple Gradients FGM Part Based on Additive Manufacturing." Applied Mechanics and Materials 433-435 (October 2013): 2076–80. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.2076.

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A simple FGM object with one gradient direction is easily fabricated by the current technique; However, how to fabricate multiple gradients FGM objects is rarely mentioned by some related papers. This paper proposed a representation and fabrication approach to deal with this problem. This approach, termed as minimum fabrication cell (MFC) or allowance fabrication cell (AFC), focus on fabrication of multiple gradients FGM object. In MFC, an arbitrary 3-D model is adaptively sliced into a series of 2-D layers, and each layer is subdivided into a series of MFC or AFC along toolpath. The three linear interpolation is applied to calculate the material for each MFC or AFC, and gradient contribution ratio (GCR) is applied to calculate the material for each vertex on the MFC or AFC.
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Zhang, Haorui, Junjin Huang, Changmeng Liu, Yongsheng Ma, Yafeng Han, Tianqiu Xu, Jiping Lu, and Hongli Fang. "Fabricating Pyramidal Lattice Structures of 304 L Stainless Steel by Wire Arc Additive Manufacturing." Materials 13, no. 16 (August 7, 2020): 3482. http://dx.doi.org/10.3390/ma13163482.

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Lattice structures have drawn considerable attention due to their superior mechanical properties. However, the existing fabrication methods for lattice structures require complex procedures, as they have low material utilization and lead to unreliable node connections, which greatly restricts their application. In this work, wire arc additive manufacturing is used to fabricate large-scale lattice structures efficiently, without any air holes between rods and panels. The principle and the process of fabricating the rods were analyzed systematically. The influence of the two most important parameters, including heat input and preset layer height, is disclosed. Through optical microscopy, the microstructure of the fabricated steel rods is found to consist of dendritic austenite and skeletal ferrite. The tensile strength of the rods can reach 603 MPa, and their elongation reaches 77%. These experimental results demonstrated the feasibility of fabricating lattice structures using wire arc additive manufacturing.
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Dissertations / Theses on the topic "Fabrication by ASC"

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Tarragó, Diego Pereira. "Processo de combustão de solução aspergida (CSA) para a obtenção de eletrodos para SOFC." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/169811.

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A diminuição nos custos de fabricação das SOFC e também a flexibilização do combustível utilizado em seu abastecimento são obstáculos que, uma vez transpostos, podem possibilitar a utilização em larga escala das SOFC. A melhoria no desempenho dos componentes das SOFC pode fazer esse dispositivo trabalhar em temperaturas mais baixas, facilitando a operação do dispositivo e aumentando sua vida útil. Nesse sentido, é útil o desenvolvimento de métodos de fabricação simples e de baixo custo de componentes de SOFC, que atualmente são obtidos na forma de filmes finos cerâmicos. Assim, é proposto o desenvolvimento de uma nova técnica baseada na reação de combustão para síntese de pós e a aerografia, no intuito de, por via úmida, obter filmes finos porosos de composições cerâmicas. Foram realizadas deposições de manganitas de lantânio dopadas com estrôncio e cromo (LSM e LSCM) e óxido de cério dopado com lantânio (LCO) sobre substratos de zircônia estabilizada com ítria (YSZ) e de aço AISI 430, com o propósito de verificar a viabilidade do método de combustão de solução aspergida (CSA) proposto neste trabalho. Embora vários dos filmes fabricados tenham ficado descontínuos ou com uma quantidade excessiva de trincas, alguns resultados foram satisfatórios. Alguns filmes de LSM depositados sobre YSZ apresentaram tamanho de grão reduzido, da ordem de algumas dezenas de nanômetros, e uma porosidade fina e interconectada que levou o material a apresentar um bom desempenho eletroquímico, visando sua aplicação como cátodo de SOFC. A partir das suas propriedades eletroquímicas e, principalmente, pela energia de ativação dos processos do eletrodo, verificou-se que a microestrutura conferida pelo método de CSA proporcionou uma melhoria no desempenho da LSM. Os filmes de LSM obtidos nesse trabalho apresentaram energias de ativação inferiores a 1,26 eV, enquanto na literatura são encontrados valores mais altos para meia-células semelhantes.
Lowering fabrication costs of SOFC’s and also their fuel flexibility are obstacles that, once transposed, can make possible the mass utilization of such devices. The improvement on the performance of SOFC’s components can allow these devices to work in lower temperatures, facilitating their operation and increasing their lifespan. In this sense, is very useful the development of simple and cheap fabrication techniques of SOFC’s components, which are nowadays obtained in the form of thin ceramic films. Thus, the development of a new fabrication method is proposed, based on the solution combustion synthesis reaction and airbrush painting, in order to obtain, by a wet chemical route, thin and porous ceramic films. Depositions of strontium and cobalt doped lanthanum manganites (LSM and LSCM) and lanthanum doped cerium oxide (LCO) were carried out over yttria-stabilized zirconia (YSZ) and AISI 430 steel with the intent of verifying the viability of the Airbrushed Solution Combustion (ASC) method, proposed in this work. Although several films fabricated by ASC were discontinuous or excessively cracked, some results were satisfactory. Some LSM films deposited over YSZ showed reduced grain size, in the order of tens of nanometers, and a fine interconnected porosity, which led the material to present good electrochemical performance, aiming its application as a SOFC’s cathode. From their electrochemical properties and, mainly, through activation energy of the electrode processes, it was seeing that the microstructure acquired with the ASC method enhanced the overall performance of LSM. The LSM films obtained in this work showed activation energies below 1,26 eV, while in the literature the values are higher than this for similar half-cells.
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Xu, Lei. "Plasma arc welding fabrication using thin titanium sheet." Thesis, University of Nottingham, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.605800.

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This work was motivated by the industrial and academic needs for process development of automated keyhole plasma arc welding (K-PA W) in thin Ti- 6AI-4V sheet and the control required for the process to be suitable for aerospace components. K-PAW, is a high energy density precision welding process which is a lowcost alternative to laser and electron beam welding. It is potentially capable of fabricating high integrity titanium alloy welds in aero-engine thin panel structures. However, the process has always represented a challenge owing to the complexity of welding torch configurations and the associated large number of process parameters to take into consideration. Three types of weld joint, which represent the welding fabrications in a simplified aero-engine casing component, were manufactured in the work: flat bead-on-plate, flat Tjoint and curved T -joint. A new welding procedure was developed to produce thin sheet T-joints by K-PAW, which has overcome the difficulty of operating the structurally complicated welding torch in limited space. An analytical model was experimentally validated and was employed to identify the process parametric envelopes for valid keyhole welding modes from the numerous possible parameter combinations. Weld joints were characterised in tenns of thermal history, micro-hardness and metallurgical microstructure. Distortion and residual stresses are maJor concerns associated with fusion welding fabrication. While distortions can lead to geometrical inaccuracy, paIticularly in the thin panel stl11ctures, residual stresses can combine with applied stresses to reduce the life of components. In this thesis, the out-of-plane l distortions of welded thin Ti-6AI-4V bead-on-plate and T-joint welds were measured using contact and non-contact coordinate-measuring techniques, from which the effects of welding sequence on the distortions can also be identified. Residual stress distributions in the welded sheet were detennined by synchrotron X-ray and neutron diffraction techniques. The use of synchrotron X-ray methods is relatively newly developed as titanium alloys respond weakly to neutron beams. These not only have provided improved understanding of residual stresses in thin sheet welds but also have greatly contributed to validation of finite element (FE) modelling work undertaken by other researchers.
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Cadiou, Stephen. "Modélisation magnéto-thermohydraulique de procédés de fabrication additive arc-fil (WAAM)." Thesis, Lorient, 2019. http://www.theses.fr/2019LORIS544.

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Un des freins au développement des procédés de fabrication additive réside dans la qualité des pièces ainsi fabriquées. Certains défauts, tels que des porosités ou des déformations peuvent apparaître. Ces défauts sont étroitement liés au choix des paramètres opératoires et à l’histoire thermique subit lors de la fabrication. La modélisation numérique peut donc aider à comprendre comment ces paramètres opératoires influent sur la géométrie du dépôt, et sur les cinétiques thermiques qui conditionneront la microstructure et les déformations de la pièce finale. Dans cette thèse, plusieurs modèles numériques de complexité croissante ont été développés afin de mieux appréhender l’état final de la pièce. La première étape a consisté à développer un modèle d’arc représentant un tir statique TIG en 2D axisymétrique. Les équations électromagnétiques, thermiques, et hydrodynamiques sont résolues dans le plasma et le bain de fusion. Ce cas de référence a permis de valider les choix faits pour la description mathématique et numérique. Ensuite, le modèle est complexifié en ajoutant une méthode level set pour le suivi des interfaces mobiles permettant la description du procédé MIG pulsé dans une configuration axisymétrique. Après avoir été validé grâce à des expériences, le modèle est transposé en 3D pour décrire la fabrication d’un mur à l’échelle du bain de fusion avec le procédé CMT. Enfin, le modèle est simplifié en ne résolvant que le transfert de chaleur afin de décrire les transferts thermiques à l’échelle d’une pièce complète
One of the obstacles to the development of additive manufacturing processes is the quality of the built parts. Some defects, such as porosity, deformations or cracks, may appear. These defects depend strongly on the choice of operating parameters. Numerical modelling can therefore help to understand how these operating parameters control the final geometry, and the thermal cycles experienced by the material, which impact the microstructure, the deformations and residual stresses of the final part. In this thesis, several numerical models have been developped in order to better understand the final characteristics of the part. The first one concerns a 2D axial-symmetric model of arc to deal with a static TIG process. The Maxwell equations coupled with the mass, momentum, energy equations are solved in the plasma and the melt pool. Using this reference case, the arc model has been validated. This model has been made more complex by adding a level set method to track the gas-liquid interface present in pulsed MIG process in 2D axial-symmetric geometry. This model has been validated through experimental data and then extended to a 3D geometry to simulate the build-up of a wall using a CMT process. This multiphysics model was limited to the scale of the melt pool. A second 3D model was then proposed at the scale of the wall using a purely thermal model to simulate the multi-layer process with geometry prediction
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Aubouin, Pascal. "Etude expérimentale et modélisation d'un arc stabilise par ablation dans un lanceur électrothermique." Lyon, INSA, 1993. http://www.theses.fr/1993ISAL0033.

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Le principe du lanceur électrothermique consiste à convertir de l'énergie stockée en énergie thermique par l'intermédiaire d'un arc électrique stabilisé par ablation (plasma), puis thermique en cinétique par détente des gaz produits. Le but de cette étude est de développer un outil global de simulation de l'arc électrique, simple d'utilisation, rapide ; afin d'optimiser l'installation. A partir de l'étude bibliographique, un tronc commun d'hypothèses et dégagé : état quasi stationnaire, plasma isotherme, ablation radiative, couche vapeur entre la plasma et les parois. Le modèle de LOEB et KAPLAN qui sert de base à notre travail, est présenté et critiqué. Parallèlement, les résultats expérimentaux mettent en évidence deux mécanisme supplémentaires : l'ablation des électrons et du tube du lanceur. Un méthode originale de dépouillement de la mesure continue de vitesse balistique du lanceur et la température moyenne des gaz de propulsion. L'analyse de l'ensemble de ces informations, les équations de notre modèle ont été établies et résolues par la méthode de NEWTON. La comparaison à l'expérience a montré que dès que le régime de décharge est établi, le calcul restitue parfaitement le comportement de l'arc. Trois enseignements majeurs sont tirés
The aperation principle of electrothermal launcher consist in converting electrical energy in thermal energy through an ablation-stabilised arc (plasma), and then in kinetic energy through the expansion of the generated gases. The goal of this study is to develop a simple model for simulating electrical arc in order to optimize the facilities. From a bibliographical analysis, a common set of hypothesis is defined: quasi stationary state, isothermal plasma, radiative ablation, vapour shield between the plasma and the walls. The model of LOEB & KAPLAN, which is our work basis is described and criticized. Concurrent experimental results show up two other mechanisms: ablations of both electrodes and gun barrel. An original method to analyse the projectile velocity measurement by L. D. I. Is used to characterize the ballistic expansion and to estimate the temperature in the barrel. Data processing gives some qualitative relations which characterize the arc resistance, the ablated masses and the launcher efficiency. The equations of our model are established according to these considerations and solved by the NEWTON method. Numerical results are in good agreement with experiments when the discharge is established. Three important teachings are brought out
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Delaportas, Dimitrios. "Fabrication and characterization of metal oxide nanoparticles by arc-discharge in water." Thesis, University of Liverpool, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.578046.

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The aim of this project was to establish the arc discharge in water method as a valid method of producing metal oxide nanoparticles (NPs) with dielectric properties. A vertical arc discharge system was designed and fabricated and several diagnostic tools were attached to the system in order to monitor in situ the propagation of the plasma. Electrical measurements, high speed imaging, optical emission spectroscopy and electrode mass reduction measurements were employed to three different anode materials; aluminum and tantalum rods as well as a mixture of copper-tantalum compressed powder grains. The cathode of the DC arc was in all cases was a carbon rod. The product of the discharge was collected in powder form and examined by means of electron microscopy, x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS) and broadband dielectric spectroscopy (BDS). The experiments showed that, during discharge, the physical processes occurring between the electrodes, force the anode material to evaporate in the atomic level. While atomization takes place, the water molecules surrounding the plasma region gets vaporized due to the localized high temperature resulting in the division of oxygen and hydrogen atoms. Metal and oxygen atoms bond, becoming the seeds for nanoparticle formation. The particle growth stops when quenching occurs due to the continuous condensation and expansion of the plasma. High-Resolution Transmission Electron Microscopy (HR-TEM) examination revealed that spherical crystalline nanoparticles are formed, with an average size of 40 nm when using either aluminum or tantalum rod. XRD and XPS analyses concluded that high purity Ah03 and Ta20s NPs are produced by using the arc discharge method respectively. HR-TEM was also employed to the nano-product of the composite anode showing a peculiar core-shell NP structure (mean size 20 nm). Scanning Transmission Electron Microscopy (STEM) was used in High Angle Annular Dark Field (HAADF) imaging and Energy Dispersive X-ray Spectroscopy (EDX) modes to identify the atomic arrangement resulting in the formation of an oxidized copper core with an oxidized tantalum shell. The nano-powder was tested via BDS showing a capacitive behavior. Throughout this work it was been proven that arc discharge in water is a cost- effective and easy to implement method of preparing dielectric NPs. A methodology for studying both the process as well as the product has been described. High purity Ah03 and Ta20s have been successfully produced. CuO- Ta20s core-shell NPs were synthesized for the first time and were characterized structurally and electrically. Adjustments in order to improve the efficiency of the system were proposed and new ideas for the formation of composite metal oxides have emerged.
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Ly, Michel. "Etude des fils électrodes pour l'usinage par étincelage érosif." Paris, ENMP, 2005. http://pastel.archives-ouvertes.fr/pastel-00705214.

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Il s'agit de relier l’avantage en termes de vitesse d’usinage, que procurent des revetements complexes de phases du systeme cuivre zinc oxygene sur les fils-electrodes de laiton, a la thermodynamique de l’arc electrique. Il apparait que les fils revetus usinent plus vite que les fils nus, pour la meme intensite, et ce malgre une tension d’arc plus faible. Les tensions d’arc moyennes de differents fils, employes en polarite negative, ont ete mesurees, comparees aux donnees bibliographiques, et modelisees. La tension d'arc d'une cathode est d’autant plus faible que la pression de vapeurs metalliques qu’elle genere est elevee. Une faible chute de potentiel a la cathode limite son echauffement, donc son erosion. Une pression elevee pendant l’arc permet d’ejecter une plus grande proportion de la matiere en fusion presente a la surface des electrodes a la fin de l'arc d’usinage. Des mesures de pertes de masse sur differents fils electrodes et sur differentes pieces confirment notre these
Zinc coated electrical discharge machining wires have a cutting speed advantage over plain brass wires. This advantage has been related to the thermodynamics of the arcs. For the same discharge current, and despite a lower arc voltage, coated wires cut faster than bare ones. Average arc voltages of different wires have been measured, and compared to published values. A thermodynamic model of the cathode has been made. Arc tension decreases as the metallic vapour pressure released by the cathode increases. Lower cathodic arc tensions release less heat, and lead to lower mass loss at said electrode. Higher arc pressures lead to higher molten electrode material ejection at the end of the arc discharges. Mass loss measurements on different wire electrodes and pieces confirm our point of view
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Querard, Vincent. "Réalisation de pièces aéronautiques de grandes dimensions par fabrication additive WAAM." Thesis, Ecole centrale de Nantes, 2019. http://www.theses.fr/2019ECDN0001/document.

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Dans le domaine de la fabrication additive plusieurs technologies cohabitent et présentent des maturités et des applications différentes : le lit de poudre, la projection de poudre et le dépôt de fil pour ne citer que les principales. Nous avons étudié, dans le cadre de cette thèse, la réalisation de pièces de grandes dimensions du domaine aéronautique en alliage d’aluminium, par technologie WAAM (Wire Arc Additive Manufacturing) robotisée. Cette technologie repose sur l’utilisation un générateur de soudure à l'arc, d’un système de protection gazeuse et d’un système d'alimentation en métal d'apport sous forme de fil. Pour répondre à cette problématique, plusieurs voies de recherche ont été investiguées. La première traitait principalement de la génération de trajectoires : Plusieurs expérimentations ont permis de montrer l’intérêt et l’importance de la génération de trajectoires et notamment la maitrise de l’orientation outil pour la fabrication additive de pièces complexes en étudiant le respect de la géométrie souhaitée. La seconde concernait l’étude de la santé matière des pièces fabriquées. Des observations au niveau de la microstructure, mais aussi des caractéristiques mécaniques ont permis de mettre en évidence l’influence des paramètres opératoires sur la qualité de la matière déposée. Enfin, la réalisation de pièces fonctionnelles dans le cadre d’un projet financé par la DGA/DGAC et dont les partenaires étaient : STELIA, CONSTELLIUM, CT INGENIERIE et l’Ecole Centrale de Nantes, a permis de mettre en avant l’intérêt du procédé pour la fabrication de pièces aéronautiques. Un élément de structure aéronautique composé de raidisseurs a été fabriqué avec le procédé WAAM sur un substrat double courbure en alliage aluminium. Les difficultés accrues de réalisation ont pu être levées par l'emploi de la méthodologie développée dans le cadre de la thèse
In the field of additive manufacturing (AM), several processes are present and have different applications and levels of development: the main technologies are powder-bed based AM, powder projection and Wire Additive Manufacturing (WAM). We have studied, in this PhD work, the manufacturing of large scale components in aluminum alloy for aircraft industry with Wire Arc Additive Manufacturing (WAAM). This technology is based on a welding generator, a shielding gas protection and a feedstock (wire in this case). To solve this issue, several ways of research were investigated. The first one dealt with toolpath generation: several experiments have highlighted the importance of tool path generation and the tool orientation to manufacture complex parts and improve the part accuracy. The second one was about the validation of the material quality after deposit. Microstructural observations and mechanical tests have demonstrated the effect of process parameters on the deposit quality. Finally, in the context of a DGA/DGAC funded research project, whose partners were STELIA, CT INGENIERIE, CONSTELLIUM and l’Ecole Centrale de Nantes, the manufacturing of functional part in aluminum alloy has shown the interest of the process for aircraft industry. A structural component based on a double curvature geometry has been manufactured with WAAM. The methodologies developed in this PhD work have enabled us to solve the issues to manufacture that type of component
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Ly, Michel. "Étude des fils électrodes pour l'usinage par étincelage érosif." Phd thesis, École Nationale Supérieure des Mines de Paris, 2005. http://pastel.archives-ouvertes.fr/pastel-00705214.

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Il s'agit de relier l'avantage en termes de vitesse d'usinage, que procurent des revêtements complexes de phases du système cuivre zinc oxygène sur les fils-électrodes de laiton, a la thermodynamique de l'arc électrique.Il apparait que les fils revêtus usinent plus vite que les fils nus, pour la même intensité, et ce malgré une tension d'arc plus faible. Les tensions d'arc moyennes de différents fils, employés en polarité négative, ont été mesurées, comparées aux données bibliographiques, et modélisées.La tension d'arc d'une cathode est d'autant plus faible que la pression de vapeurs métalliques qu'elle généré est élevée. Une faible chute de potentiel a la cathode limite son échauffement, donc son érosion. Une pression élevée pendant l'arc permet éjecter une plus grande proportion de la matière en fusion présente a la surface des électrodes a la fin de l'arc d'usinage.Des mesures de pertes de masse sur différents fils électrodes et sur différentes pièces confirment notre thèse.
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Ravary, Benjamin. "Modélisation thermique et hydrodynamique d'un réacteur plasma triphasé : contribution à la mise au point d'un procédé industriel pour la fabrication de noir de carbone." ENSMP, 1998. https://pastel.archives-ouvertes.fr/tel-01138155.

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Le noir de carbone dont la production mondiale s’élève à 6 millions de tonnes par an est aujourd'hui presque exclusivement produit par un procédé de combustion incomplète particulièrement polluant. Le craquage d'hydrocarbures par plasma constitue une alternative écologique et flexible, qui a fait l'objet de plusieurs travaux de recherche. Le projet initié par l’École des Mines de Paris, a permis de réaliser un réacteur pilote à plasma d'arcs triphasés de 100 kW et de démontrer la faisabilité du procédé. La modélisation hydrodynamique du pilote s'inscrit dans le cadre de la caractérisation et de l’amélioration du procédé en cours de développement. L'analyse de l’écoulement a montré que les arcs triphasés constituent le principal moteur de l’écoulement. Ils transmettent l’énergie électrique et leurs interactions électromagnétiques conduisent à un mouvement d'ensemble centrifuge observé à la caméra rapide. Les forces de Lorentz ont été évaluées, en supposant des petites déformations des arcs. Elles ont été moyennées et introduites sous forme d'un terme source de quantité de mouvement, dans une zone spécifique du modelé hydrodynamique. Ce modèle est construit à l'aide du code de dynamique des fluides numériques fluent. Il inclut le rayonnement entre les parois et différents modèles de turbulence ont été testés. L'influence des paramètres de réglage du réacteur (nature du gaz plasma, débit et puissance électrique) a été étudiée numériquement. Le principal paramétre libre du modèle est la conductivité des parois. Le modèle a été validé par des mesures de pertes calorimétriques et de températures de parois, obtenues grâce à l'instrumentation du pilote qui est présentée. Il a été utilisé pour identifier les meilleures conditions, en termes de mélange et d'isolation, lors de l'injection radiale depuis la paroi, d'un gaz froid de même nature que le plasma.
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Ledoux, Martial. "Acide rumenique : presence dans le beurre et influence des procedes de fabrication ; incidence sur l'atherosclerose experimentale chez le hamster." Phd thesis, INAPG (AgroParisTech), 2005. http://pastel.archives-ouvertes.fr/pastel-00003476.

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Les acides linoléiques conjugués (ALC) sont des isomères positionnels et géométriques de l'acide linoléique 18:2 9c,12c, représentés par deux isomères principaux : l'acide ruménique ou 9c,11t, et l'isomère 10t,12c. L'acide ruménique est naturellement retrouvé dans les produits laitiers ; mais les tables de composition des aliments souffrent actuellement d'un manque de données concernant cet acide gras particulier. Les ALC, et notamment l'acide ruménique, semblent présenter des propriétés biologiques intéressantes pour la santé humaine, notamment lors de l'athérogenèse. Cependant, ces études utilisent des mélanges d'ALC. Le rôle respectif de chaque isomère est encore mal connu. Le premier volet de notre travail constituait déterminer les teneurs en acide ruménique de matières grasses laitières de plusieurs régions de France, sur plusieurs saisons, et d'étudier les variations de ces teneurs lors du passage du lait, à la crème, puis au beurre. Nos résultats montrent que les taux d'acide ruménique dans la matière grasse laitière varie avec la région et la saison étudiées. Ces différences pourraient être principalement imputables aux teneurs en acides gras poly-insaturés, et notamment en acide linoléique, de l'alimentation des bovins. Aucune variation n'est remarquée lors de la fabrication du beurre ; l'écrémage du lait, la maturation de la crème et le barattage ne semblent pas modifier les taux d'acide ruménique de la matière grasse laitière. Le deuxième volet de notre étude avait pour but de différencier le rôle de chacun des deux principaux isomères, et de focaliser sur les propriétés propres de l'acide ruménique, chez le hamster nourri avec un régime athérogène. Il ressort de nos travaux que l'acide ruménique exercerait un effet bénéfique supérieur à celui de l'isomère 10t,12c, sur une souche de hamster lors d'athérogenèse très précoce. Cependant cet effet bénéfique ne se fait plus sentir chez une autre espèce plus sensible à cette maladie, lors de stade plus avancé. En conclusion, l'exploration des propriétés biologiques de l'acide ruménique en regard de l'athérogenèse demande des travaux supplémentaires sur un modèle animal mieux adapté.
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Books on the topic "Fabrication by ASC"

1

NATO Advanced Study Institute on Physics, Fabrication, and Applications of Multilayered Structures (1987 Bandol, France). Physics, fabrication, and applications of multilayered structures. New York: Plenum Press, 1988.

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Learn to weld: Beginning MIG welding and metal fabrication basics. Beverly, MA: Quarry Books, 2014.

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Kikō, Genshiryoku Anzen Kiban. Uran nenryō kakō shisetsu ni okeru "anzenjō jūyō na shisetsu" ni kansuru kōsatsu: Consideration on "facilities important to safety" in uranium fuel fabrication facilities. Tōkyō-to Minato-ku: Dokuritsu Gyōsei Hōjin Genshiryoku Anzen Kiban Kikō, 2012.

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Kikō, Genshiryoku Anzen Kiban. Kakō shisetsu oyobi saishori shisetsu no kensa seido nado no arikata ni tsuite: Improvement of regulations for uranium fuel fabrication, enrichment facilities and spent fuel reprocessing facilities. Tōkyō-to Minato-ku: Dokuritsu Gyōsei Hōjin Genshiryoku Anzen Kiban Kikō, 2012.

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Günther, Hans-Peter, ed. Use and Application of High-Performance Steels for Steel Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2005. http://dx.doi.org/10.2749/sed008.

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<p>New steel production processes have led to a remarkable improve­ment in steel products within the last few years, and now allows steels to be produced according to the desired mechanical and chemical properties. High-Performance Steel (HPS) is the designa­tion given to this new generation of steels that offer higher performance not only in terms of strength but also toughness, weld­ability, cold formability and corrosion resistance, compared to the traditionally used mild steel grades.</p> <p>The development of HPS goes with today's increased demand for slender lightweight structures, as for example in bridge design and the design of high-rise buildings, where there is a strong require­ment to use high-strength materials in combination with good execution and fabrication properties. However, on the structural engineering side there is a need for knowledge on these new steel grades, and quite often design codes do not provide sufficient information to fully exploit the advantageous properties of HPS.</p> <p>The present volume provides an overview of the development and application of HPS on an international level. This is done by giving information on, for example, the production process, the chemical and mechanical properties, the relevant design and fabrication standards and on recent research results. Approximately fifteen included examples of realised applications aim to provide detailed information based on existing technical solutions, and to point out the major benefits when using HPS in comparison to mild steels.</p> <p>The document is thus not a monograph but an assembly of contri­butions from different countries. lt is separated into chapters related to different countries, namely the USA, Canada, Japan and Europe, all of them providing a state-of-the-art report on HPS.</p>
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Moran, Arik. Kingship and Polity on the Himalayan Borderland. NL Amsterdam: Amsterdam University Press, 2019. http://dx.doi.org/10.5117/9789462985605.

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Kingship and Polity on the Himalayan Borderland explores the modern transformation of state and society in the Indian Himalaya. Centred on three Rajput led-kingdoms during the transition to British rule (c. 1790-1840) and their interconnected histories, it demonstrates how border making practices engendered a modern reading of ‘tradition’ that informs communal identities to this day. Countering the common depiction of these states as all-male, caste-exclusive entities, it reveals the strong familial base of Rajput polity, wherein women — and regent queens in particular — played a key role alongside numerous non-Rajput groups. Drawing on rich archival records, rarely examined local histories, and nearly two decades of ethnographic research, it offers an alternative to the popular and scholarly discourses that developed with the rise of colonial knowledge. The analysis exposes the cardinal contribution of borderland spaces to the fabrication of group identities. This book will interest historians and anthropologists of South Asia and of the Himalaya, as well as scholars working on postcolonialism, gender, and historiography.
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Plutonium disposition and the U.S. mixed oxide fuel fabrication facility: Hearing before the Strategic Forces Subcommittee of the Committee on Armed Services, House of Representatives, One Hundred Ninth Congress, second session, hearing held, July 26, 2006. Washington: U.S. G.P.O., 2007.

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Weston, J. Exploiting Robots in Arc Welded Fabrication. Woodhead Publishing Ltd, 1989.

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Kong, X. Y., Y. C. Wang, X. F. Fan, G. F. Guo, and L. M. Tong. Free-standing grid-like nanostructures assembled into 3D open architectures for photovoltaic devices. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533060.013.22.

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This article describes three-dimensional open architectures with free-standing grid-like nanostructure arrays as photocatalytic electrodes for a new type of dye-sensitized solar cell. It introduces a novel technique for fabricating a series of semiconducting oxides with grid-like nanostructures replicated from the biotemplates. These semiconducting oxides, including n-type titanium dioxide or p-type nickel oxide nanogrids, were sensitized with the dye molecules, then assembled into 3D stacked-grid arrays on a flexible substrate by means of the Langmuir–Blodgett method or the ink-jet printing technique for the photocatalytic electrodes. The article first considers the fabrication of photoelectrodes with 2D grid-like nanostructures by means of the biotemplating approach before discussing the assembly and photophysicsof grid-like nanostructures into 3D open architectures for the photocatalytic electrodes.
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Weisbuch, Claude. Physics, Fabrication, and Applications of Multilayered Structures. Springer, 1989.

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Book chapters on the topic "Fabrication by ASC"

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Poeppel, R. B., B. K. Flandermeyer, J. T. Dusek, and I. D. Bloom. "Fabrication of YBa2Cu3O7Superconducting Ceramics." In ACS Symposium Series, 261–65. Washington, DC: American Chemical Society, 1987. http://dx.doi.org/10.1021/bk-1987-0351.ch024.

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Ziari, M., A. Chen, S. Kalluri, W. H. Steier, Y. Shi, W. Wang, D. Chen, and H. R. Fetterman. "Polymer Electrooptic Waveguide Fabrication." In ACS Symposium Series, 420–35. Washington, DC: American Chemical Society, 1995. http://dx.doi.org/10.1021/bk-1995-0601.ch031.

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Nagayama, Kuniaki, and Antony S. Dimitrov. "Fabrication and Application of Particle-Crystalline Films." In ACS Symposium Series, 468–89. Washington, DC: American Chemical Society, 1996. http://dx.doi.org/10.1021/bk-1996-0648.ch028.

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Sharma, Rashi, Stephen M. Kuebler, Christopher N. Grabill, Jennefir L. Digaum, Nicholas R. Kosan, Alexander R. Cockerham, Noel Martinez, and Raymond C. Rumpf. "Fabrication of Functional Nanophotonic Devices via Multiphoton Polymerization." In ACS Symposium Series, 151–71. Washington, DC: American Chemical Society, 2019. http://dx.doi.org/10.1021/bk-2019-1315.ch009.

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Oikawa, H., H. Kasai, and H. Nakanishi. "Fabrication of Organic Microcrystals and Their Optical Properties." In ACS Symposium Series, 158–68. Washington, DC: American Chemical Society, 2001. http://dx.doi.org/10.1021/bk-2001-0798.ch011.

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Dong, Bin, and Lifeng Chi. "Conducting Polymeric Nano/Microstructures: From Fabrication to Sensing Applications." In ACS Symposium Series, 181–97. Washington, DC: American Chemical Society, 2015. http://dx.doi.org/10.1021/bk-2015-1215.ch010.

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Qian, Jian. "Hollow Micro-/Nano-Particles from Biopolymers: Fabrication and Applications." In ACS Symposium Series, 257–87. Washington, DC: American Chemical Society, 2014. http://dx.doi.org/10.1021/bk-2014-1175.ch014.

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Casale, Nicholas, Daniel Bristow, and Christopher M. Pastore. "Design and Fabrication of a Braided Composite Monocoque Bicycle Frame." In ACS Symposium Series, 90–101. Washington, DC: American Chemical Society, 1991. http://dx.doi.org/10.1021/bk-1991-0457.ch006.

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Liu, Gang-yu, and Song Xu. "Nanometer Scale Fabrication of Self-Assembled Monolayers: Nanoshaving and Nanografting." In ACS Symposium Series, 199–208. Washington, DC: American Chemical Society, 1999. http://dx.doi.org/10.1021/bk-1999-0727.ch015.

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Kawakami, Yusuke, and Yeong Hee Cho. "Function of Silicon-Oxygen Bonds in Fabrication of Holographic Gratings." In ACS Symposium Series, 243–67. Washington, DC: American Chemical Society, 2010. http://dx.doi.org/10.1021/bk-2010-1051.ch019.

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Conference papers on the topic "Fabrication by ASC"

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Scott, Matthew, Andrew Enke, and John Flanagan. "SensorCraft Free-Flying Aeroservoelastic Model: Design and Fabrication." In 52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-1957.

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Simburger, Edward, Thomas Giants, James Matsumoto, Alexander Garcia, Simon Liu, John Lin, Stephen Scarborough, et al. "Fabrication and Testing of a PowerSphere Engineering Development Unit." In 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-1878.

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Dai, Jingyao, Jogender Singh, and Namiko Yamamoto. "Fabrication and Mechanical Characterization of Nanoporous Ceramic Composites for Potential Toughening." In 2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-1641.

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Wei, Fu-Shang, Luz Amaya-Bower, Alfred Gates, Daniel Rose, and Thomas Vasko. "The Full-Scale Helicopter Flight Simulator Design and Fabrication at CCSU." In 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-0582.

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De Backer, Wout, Arturs P. Bergs, and Michael J. Van Tooren. "Multi-Axis Multi-Material Fused Filament Fabrication with Continuous Fiber Reinforcement." In 2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-0091.

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Gurdal, Zafer, Brian Tatting, and K. Wu. "Tow-Placement Technology and Fabrication Issues for Laminated Composite Structures." In 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-2017.

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Grenoble, Ray W., Thuan Nguyen, Martin J. McKenney, Adam Przekop, Peter D. Juarez, Elizabeth D. Gregory, and Dawn C. Jegley. "Fabrication of a Composite Tow-Steered Structure for Air-Launch Vehicle Applications." In 2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-1376.

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Spencer, Mychal P., David Gao, and Namiko Yamamoto. "Experimental and Simulation Studies on Magnetic Nanoparticle Assembly for Scalable Polymer Nanocomposite Fabrication." In 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-0798.

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Kellas, Sotiris, and Robert Mitcheltree. "Energy Absorber Design, Fabrication and Testing for a Passive Earth Entry Vehicle." In 43rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-1224.

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Witherspoon, Scott, and Steve Tung. "Design and Fabrication of an EAP Actuator System for Space Inflatable Structures." In 43rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-1449.

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Reports on the topic "Fabrication by ASC"

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Timothy A. Hyde. Fabrication Report for the AFC-2A and AFC-2B Capsule Irradiations in the ATR. Office of Scientific and Technical Information (OSTI), October 2007. http://dx.doi.org/10.2172/920407.

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Gupta, Shweta. Synthetic Biology: The Gateway to Future Biotechnological Industry. Science Repository OÜ, May 2021. http://dx.doi.org/10.31487/sr.blog.34.

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Synthetic biology has come up as a new interdisciplinary area involving the application of engineering principles in the field of biology aiming at fabricating and redesigning biological systems and components that are not naturally found in the world.
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Melnyk, Iurii. JUSTIFICATION OF OCCUPATION IN GERMAN (1938) AND RUSSIAN (2014) MEDIA: SUBSTITUTION OF AGGRESSOR AND VICTIM. Ivan Franko National University of Lviv, March 2021. http://dx.doi.org/10.30970/vjo.2021.50.11101.

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The article is dedicated to the examination and comparison of the justification of occupation of a neighboring country in the German (1938) and Russian (2014) media. The objective of the study is to reveal the mechanics of the application of the classical manipulative method of substituting of aggressor and victim on the material of German and Russian propaganda in 1938 and in 2014 respectively. According to the results of the study, clear parallels between the two information strategies can be traced at the level of the condemnation of internal aggression against a national minority loyal to Berlin / Moscow and its political representative (the Sudeten Germans – the pro-Russian Ukrainians, as well as the security forces of the Yanukovych regime); the reflections on dangers that Czechoslovakia / Ukraine poses to itself and to its neighbors; condemnation of the violation of the cultural rights of the minority that the occupier intends to protect (German language and culture – Russian language and culture); the historical parallels designed to deepen the modern conflict, to show it as a long-standing and a natural one (“Hussites” – “Banderites”). In the manipulative strategy of both media, the main focus is not on factual fabrication, but on the bias selection of facts, due to which the reader should have an unambiguous understanding of who is the permanent aggressor in the conflict (Czechoslovakia, Czechs – Ukraine, Ukrainians), and who is the permanent victim (Germans – Russians, Russian speakers). The substitution of victim and aggressor in the media in both cases became one of the most important manipulative strategies designed to justify the German occupation of part of Czechoslovakia and the Russian occupation of part of Ukraine.
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