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Littérature scientifique sur le sujet « Cu CODH »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Cu CODH"

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Hollingsworth, Thilini S., Ryan L. Hollingsworth, Richard L. Lord et Stanislav Groysman. « Cooperative bimetallic reactivity of a heterodinuclear molybdenum–copper model of Mo–Cu CODH ». Dalton Transactions 47, no 30 (2018) : 10017–24. http://dx.doi.org/10.1039/c8dt02323a.

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Ghosh, Dibbendu, Soumen Sinhababu, Bernard D. Santarsiero et Neal P. Mankad. « A W/Cu Synthetic Model for the Mo/Cu Cofactor of Aerobic CODH Indicates That Biochemical CO Oxidation Requires a Frustrated Lewis Acid/Base Pair ». Journal of the American Chemical Society 142, no 29 (29 juin 2020) : 12635–42. http://dx.doi.org/10.1021/jacs.0c03343.

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Reginald, Stacy Simai, Michael Etzerodt, Deby Fapyane et In Seop Chang. « Functional Expression of a Mo–Cu-Dependent Carbon Monoxide Dehydrogenase (CODH) and Its Use as a Dissolved CO Bio-microsensor ». ACS Sensors 6, no 7 (12 juillet 2021) : 2772–82. http://dx.doi.org/10.1021/acssensors.1c01243.

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Swist, Teresa, et Liam Magee. « Academic Publishing and its Digital Binds : Beyond the Paywall towards Ethical Executions of Code ». Culture Unbound 9, no 3 (1 février 2018) : 240–59. http://dx.doi.org/10.3384/cu.2000.1525.1793240.

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In this article we explore various constraints and potentials of academic publishing in the digital age. Advancement of digital platforms and their expansive reach amplify the underlying tensions of institutional and scholarly change. A key affordance of these platforms is that of speed: rapidly distributing the outputs of a precaritised profession and responding to pressures to publish as well as the profit motive of publishers. On the one hand, these systems make possible alternative modes of contributory content and peer-production for supporting the commons. On the other, they turn all too readily into privatising devices for contracting labour and profit in the corporate sector and, within the academy, for accentuating subtle power effects. Drawing upon platform studies and integrating insights from political philosophy and property law, our article seeks to problematise neat binaries of possession and dispossession associated with the sector. We examine in particular how co-existing and emergent socio-technical circuits—what we term digital binds—modulate the political economy of academic publishing on a number of scales. These entangled binds constrain but also indicate mechanisms for opening up new possibilities. We introduce three ethical executions of code towards this end: dissuading, detouring, and disrupting. Together, these mechanisms show how mutually beneficial boundaries can be drawn for designing otherwise: by blocking dominant systems and bargaining for fairer practices; exploring sanctioned and unsanctioned systems which offer more diverse publishing pathways; and, disrupting systemic processes and profits towards more inclusive and equitable conditions.
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Narrain, Siddharth. « Social Media, Violence and the Law : ’Objectionable Material’ and the Changing Countours of Hate Speech Regulation in India ». Culture Unbound 10, no 3 (13 février 2019) : 388–404. http://dx.doi.org/10.3384/cu.2000.1525.2018103388.

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With the advent of the internet and increasing circulation of hate speech, and material that has been linked to public order disturbances, there has been a shift in the legal discourse around hate speech. What has emerged, especially post the striking down of section 66A of the Information Technology Act, are categories such as ‘objectionable’, ‘provocative’ content. The focus has shifted from the content itself, what it says, and the intention of the author, to being able to pre-empt the circulation of such material. Law is increasingly invoked to prevent speech (through prior restraint) rather than post facto investigation and prosecutions. This in turn has given rise to a range of institutional mechanisms such as monitoring labs that are now part of policing practice. Additionally, civil society organizations are now collaborating with police to help trigger mechanisms to take content off internet platforms. Increasingly it is through keywords and algorithmic searches that the category of hate speech has been defined rather than traditional legal doctrine. In the words of Lawrence Lessig, code plays the role of law, and the architecture of the internet becomes policy. This paper will examine the issues outlined above relying heavily on a series of interviews with lawyers, policy analysts, journalists, academics, civil society activists, and police personnel conducted in Delhi, Bengaluru, Mumbai and Pune.
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Chen, L., et H. Sawada. « Characterization of sub-picosecond laser-produced fast electrons by modeling angularly resolved bremsstrahlung measurements with 3D hybrid particle-in-cell code ». Physics of Plasmas 29, no 9 (septembre 2022) : 093104. http://dx.doi.org/10.1063/5.0089464.

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Hard x-rays produced by intense laser-produced fast electrons interacting with solids are a vital source for producing radiographs of high-density objects and implosion cores for inertial confinement fusion. Accurate calculation of hard x-ray sources requires a three-dimensional (3D) simulation geometry that fully models the electron transport dynamics, including electron recirculation and the generation of absolute photon yields. To date, 3D simulations of laser-produced bremsstrahlung photons over tens of picoseconds and code benchmarking have not been performed definitively. In this study, we characterize sub-picosecond laser-produced fast electrons by modeling angularly resolved bremsstrahlung measurements for refluxing and non-refluxing targets using the 3D hybrid particle-in-cell (PIC), Large Scale Plasma code. Bremsstrahlung radiation and escaped electron data were obtained by focusing a 50-TW Leopard laser (15 J, 0.35 ps, 2 × 1019 W/cm2) on a 100- μm-thick Cu foil and a Cu with a large plastic backing (Cu–CH target). Data for both the Cu and Cu–CH targets were reproduced for simulations with a given set of electron parameters. Comparison of the simulations revealed that the hard x-ray emission from the Cu target was significantly longer in duration than that from the Cu–CH target. The benchmarked hybrid PIC code could prove to be a powerful tool in the design and optimization of time- and angular-dependent bremsstrahlung sources for flash x-ray and gamma-ray radiography.
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Khan, M. Junaid Iqbal, Mubashra Shakeel, Iqra Majeed, Abid Latif, Javed Ahmad, Hamid Ullah, M. Fakhar-e-Alam, Zartasha Mustansar, Mazia Asghar et Shaima A. M. Abdelmohsen. « Exploring structural, electronic, optical, magnetic, and thermoelectric properties of Pt doped and Pt-Cu/Au co-doped GaN ». Physica Scripta 97, no 4 (15 mars 2022) : 045809. http://dx.doi.org/10.1088/1402-4896/ac5b43.

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Abstract We present a computational research on investigating the structural, electronic, optical, magnetic, and thermoelectric properties of Pt doped and Pt-Cu/Au co-doped GaN using the Wien2k code. The PBE-GGA approximation is employed in Wien2k code using density functional theory. Study of electronic properties reveals that the d-states of Pt, Cu, and Au atoms participate actively in transferring electron from valence to conduction band and their addition as mono and co-doped formation turns the non-magnetic character of GaN to magnetic. A blueshift in absorption spectrum appear and absorption is more pronounced for Pt-Cu/Au co-doped GaN, suggesting the use of these materials for high energy UV optoelectronics, spintronics, photonic, and sensing devices. However, lower reflection and enhanced conductivity of Pt-Cu/Au co-doped materials in the UV region extends their potential applications in high frequency electronics. Moreover, higher ZT value of Pt@GaN suggest it a better thermoelectric source other than Pt-Cu/Au@GaN.
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Gu, Zheng Gang, Min Wu et Ping Ning. « Study of Heavy Metal Speciation in Surface Sediments of Lugu Lake, China ». Applied Mechanics and Materials 448-453 (octobre 2013) : 293–98. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.293.

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The speciation of the heavy metals Cu, Cr, and Pb in surface sediment samples collected from Lugu Lake in China was analyzed by European Community Bureau of Reference (BCR) sequential extraction methods. Heavy metal bioavailability was assessed by risk assessment code. This study demonstrates that BCR sequential extraction methods and risk assessment code can be used as valuable tools to assess heavy metal mobility, bioavailability and eco-toxicity. The distribution of Cu, Cr, and Pb in the surface sediment of Lugu Lake showed that all three metals were mainly present in the reducible fraction. The bioavailability of the heavy metals in the surface sediment was in the order Cu > Cr > Pb.
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Gójska, Aneta Maria, Karol Kozioł, Adam Wasilewski, Ewelina Agnieszka Miśta-Jakubowska, Piotr Mazerewicz et Jakub Szymanowski. « FLUKA Simulations of Kβ/Kα Intensity Ratios of Copper in Ag–Cu Alloys ». Materials 14, no 16 (9 août 2021) : 4462. http://dx.doi.org/10.3390/ma14164462.

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The numerical simulations of Cu Kα and Cu Kβ fluorescence lines induced by Rh X-ray tube and by monoenergetic radiation have been presented. The copper Kβ/Kα intensity ratios for pure elements as well as for Ag–Cu alloys have been modeled. The results obtained by use of the FLUKA code, based on the Monte-Carlo approach, have been compared to available experimental and theoretical values. A visible relationship was found between the simulated Kβ/Kα intensity ratios and the copper content of the Ag–Cu alloy: as the Cu content increases, the Kβ/Kα coefficient decreases. The results can play role in elemental material analysis, especially in archaeometry.
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Wang, Qing, et Manel del Valle. « Determination of Chemical Oxygen Demand (COD) Using Nanoparticle-Modified Voltammetric Sensors and Electronic Tongue Principles ». Chemosensors 9, no 3 (27 février 2021) : 46. http://dx.doi.org/10.3390/chemosensors9030046.

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This manuscript reports the use of nanoparticle-modified voltammetric sensors for the rapid and green determination of chemical oxygen demand in river waters and waters from agricultural waste. Four different variants of modified electrodes have been prepared: CuO nanoparticles electrogenerated over Cu and covered with Nafion film (CuO/Cu-Nf), and graphite–epoxy composites modified with Cu, CuO, and Cu–Ni alloy nanoparticles. The response features of these electrodes were assessed by calibrating them vs. glucose, glycine, ethyleneglycol, and hydrogenphtalate in alkaline media, as samples providing different difficulty in their (bio)degradation characteristics. The most sensitive electrode was demonstrated to be the (CuO/Cu-Nf) electrode, with an LOD of 12.3 mg O2·L−1. The joint information provided by the sensor array showed the ability of estimating both the organic load and the type of sample in terms of difficulty of degradation, in what can be named an intelligent sensor assembly.
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Thèses sur le sujet "Cu CODH"

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ROVALETTI, ANNA. « A computational outlook on the catalysis exerted by the unique active site of MoCu CO dehydrogenases ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2021. http://hdl.handle.net/10281/305403.

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I processi di produzione e consumo negli ecosistemi del suolo contribuiscono ai cicli biochimici globali di molti gas in tracce (CH4, CO, H2, N2O e NO) che sono rilevanti per la chimica atmosferica e il clima. Tali piccole molecole di gas svolgono ruoli diversi nel metabolismo dei microrganismi posti nel suolo che si basano su metalloenzimi specifici per la loro trasformazione. Tra questi, è stato dimostrato che i metalloenzimi a base di molibdeno sono cruciali in tale contesto. In particolare, è stato riportato che un molibdoenzima specifico è coinvolto nell'ossidazione della CO atmosferica. MoCu CO deidrogenasi (MoCu CODH) è un enzima presente nei carbossidobatteri aerobici, come Oligotropha carbossidovorans, che rappresentano uno dei componenti essenziali nel consumo biogeochimico di monossido di carbonio (CO). Essi infatti contribuiscono al mantenimento della concentrazione subtossica di CO nella bassa atmosfera elaborandone circa 2 × 108 tonnellate all'anno. Questa metalloproteina batterica catalizza l'ossidazione della CO a CO2, mentre può anche scindere H2 in due protoni e due elettroni. Tali reazioni vengono eseguite grazie a un sito attivo unico composto da due metalli, uno ione rame e uno molibdeno, legati tra loro tramite un atomo di zolfo. Nonostante siano stati condotti ampi studi teorici e sperimentali su questo enzima, diversi aspetti relativi alla sua reattività non sono stati ancora chiariti. Nella presente tesi ci siamo concentrati sulla descrizione in silico di MoCu CODH al fine di approfondire la comprensione dei meccanismi di reazione catalizzati dall'enzima. Per fare ciò, nel quadro della teoria del funzionale della densità (DFT), abbiamo applicato modelli di diverse dimensioni per ottenere una descrizione accurata del sistema. Nel contesto della catalisi dell'ossidazione della CO, abbiamo evidenziato che se un intermedio simile al tiocarbonato si forma lungo il percorso catalitico, non rappresenta una specie limitante la velocità nel panorama energetico enzimatico, a differenza di quanto proposto in base ai risultati di precedenti studi teorici. Inoltre, siamo stati in grado di suggerire un meccanismo catalitico alternativo per l'ossidazione della CO che coinvolge il ruolo diretto di una molecola d'acqua, attivata dal sito attivo circostante. Per quanto riguarda l'attività idrogenasica di MoCu CODH, sono stati presentati due meccanismi plausibili per la scissione di H2. Per la prima volta abbiamo suggerito che il sito attivo MoCu CODH possa essere visto come Frustrated Lewis Pairs (FLP) e abbiamo proposto un meccanismo tipo FLP per l'ossidazione del diidrogeno. In alternativa, un evento di protonazione, quale la protonazione del residuo di cisteina coordinata allo ione rame prima del legame di H2 al sito attivo, si è rivelato necessario per presentare un canale reattivo plausibile.
Production and consumption processes in soil ecosystems contribute to the global bio­chemical cycles of many trace gases (CH4, CO, H2, N2O and NO) that are relevant for atmospheric chemistry and climate. Such small gas molecules play different role into the metabolism of microorganisms placed in soil that rely on specific metalloen­zymes for their transformation. Among these, molybdenum-­based metalloenzymes were evidenced to be crucial in such context. In particular, a specific molybdoen­zyme was reported to be involved in atmospheric CO oxidation. MoCu CO dehy­drogenases (MoCu CODH) is an enzyme found in aerobic carboxido­bacteria, such as Oligotropha carboxidovorans which represent one of the essential components in the biogeochemical carbon monoxide (CO) consumption. In fact, they contribute to maintenance of sub­toxic concentration of CO in the lower atmosphere by processing approximately 2×108 tons of it annually. This bacterial metalloprotein catalyses the oxidation of CO to CO2, while it can also split H2 in two protons and two electrons. Such reactions are performed thanks to a unique active site composed of two metals, a copper ion and a molybdenum one, linked together through a sulphur atom. Despite extended theoretical and experimental studies had been carried out concerning this enzyme, several aspects related to its reactivity have not been unravelled.In the present thesis, we focused on the in silico description of MoCu CODH in order to deepen the understanding of the reaction mechanisms catalysed by the enzyme. To do so, in the framework of density functional theory (DFT), we applied models of different sizes to obtain an accurate description of the system. In the context of CO oxidation catalysis, we evidenced that if a previously proposed thiocarbonate ­like intermediate is formed along the catalytic path, it does not repre­sent a rate ­limiting species on the enzymatic energy landscape, differently from results of previous theoretical studies. Moreover, we were able to suggest an alternative cat­alytic mechanism for the oxidation of CO that involves the direct role of a water molecule, activated by the sourrounding active site. As for the MoCu CODH hydrogenase activity, two plausible mechanisms for the splitting of H2 were presented. For the first time we suggested that the MoCu CODH active site may be viewed as a Frustrated Lewis Pair (FLP), and we proposed a FLP­-like mechanism for oxidation of the dihydrogen. Alternatively, a protonation event–e.g. Cu­-bound cysteine residue protonation – prior to binding of H2 to the active site proved to be necessary to present a plausible reactive channel.
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« Caracterização da microestrutura dendritica na solidificação vertical descendente de ligas AL-CU ». Tese, Biblioteca Digital da Unicamp, 2004. http://libdigi.unicamp.br/document/?code=vtls000349168.

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« Ressonancia magnetica eletronica em materiais heterogeneous : Gd5(SixGe1-x)4, Co-SiO2 e Co-Cu ». Tese, Biblioteca Digital da Unicamp, 2006. http://libdigi.unicamp.br/document/?code=vtls000375050.

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Chang, Sung Chi, et 張松吉. « The Synthesis of MOCVD Precursor (hfac)Cu(COD) and the Initial Growth of Copper Thin Films ». Thesis, 2001. http://ndltd.ncl.edu.tw/handle/81018319076126449527.

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碩士
國立臺灣科技大學
化學工程系
89
The volatile copper(I) complex (β-diketonate)CuI(COD) whereβ-diketonate = hexafluoroacetylacetonate(hfac), and COD = 1, 5-clcyooctandine has been successfully prepared in high yield. This species has been characterized by H1-NMR and FTIR to ensure its high purity. The thermal stability found by DSC and TGA makes the compound a great precursor for Cu CVD. A highly conductive copper film can be deposited conformally, continuously, nonporously, and purely by the disproportionation reaction of (hfac)CuI(COD) at proper deposition temperature, precursor partial pressure, and deposition time. According to these characters, (hfac)CuI(COD) will be an excellent precursor for Cu seed layer deposition. Without SEM, the nonporous and continuous conditions of Cu thin films can be easily detected by sheet resistance and reflectivity measurements, which provide a noble methodology as the end-point indicator of seed layer deposition.
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Chou, Wei-Chi, et 周偉吉. « The Initial and Two-Step Growth of MOCVD Copper Using (hfac)Cu(COD) as the Precursor ». Thesis, 2002. http://ndltd.ncl.edu.tw/handle/09964445462519256275.

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碩士
國立臺灣科技大學
化學工程系
90
Copper films were directly deposited on TaN surface by MOCVD。A highly conductive and pure copper film can be deposited conformally、continuously、and nonporously at 190℃for 9 min。 Instead SEM，the porousity and continuity of copper films can be determined by sheet resistance and reflectivity measurements，which provide noble methodologies for the end-point detection of seed layer deposition。 During the nucleation stage of copper films，the formation of more copper nuclei can produce copper films with smaller grains。Thus，we investigated the two-step growth methodology for the deposition of copper films：in the first step，the nucleation is done at 80℃ for 3 min then the temperature is raised to 190℃ and stayed there for 3 min；in the second step，the CVD is done at 190℃ for 3 min。
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« Estudo de mineralizações de tipo Cu-porfiro do sul do Peru por meio de sensoriamento remoto e aeromagnetometria ». Tese, Biblioteca Digital da Unicamp, 2002. http://libdigi.unicamp.br/document/?code=vtls000271614.

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« Avaliação do potencial da provincia ignea continental do Parana para mineralirações de Ni-Cu-EGP, a partir dos modelos Noril'SK e ensizwa ». Tese, Biblioteca Digital da Unicamp, 2021. http://libdigi.unicamp.br/document/?code=vtls000076151.

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« O teatro do dia-a-dia interpretado a luz do gestus brechtiano : "pixei e sai correndo pau no cu de quem ta lendo..." ». Tese, Biblioteca Digital da Unicamp, 2005. http://libdigi.unicamp.br/document/?code=vtls000365602.

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Livres sur le sujet "Cu CODH"

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Holbrow, Kirstin, Diana Hendry et Llinos Dafydd. Codi Calon Tad-Cu. Gomer Press, 2009.

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Chapitres de livres sur le sujet "Cu CODH"

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Liu, Liheng, Jinchao Wang et Dongwei He. « Treatment of amoxicillin wastewater by Fe/Cu micro-electrolysis and the COD removal kinetics : Effects of Fe filler particle size and shape ». Dans Advances in Applied Chemistry and Industrial Catalysis, 414–24. London : CRC Press, 2022. http://dx.doi.org/10.1201/9781003308553-63.

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« The CU Project Is Finally Officially Code Complete ». Dans A Tale of Two Systems, 243–49. Productivity Press, 2009. http://dx.doi.org/10.1201/b10308-26.

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SHIMOMURA, Yoshiharu, Nishio WATANABE et Rieko NISHIGUCHI. « BINARY COLLISION “MARLOWE” CODE SIMULATION OF THE POINT DEFECT STRUCTURE OF DISPLACEMENT DAMAGE CASCADES IN NEUTRON-IRRADIATED CU AND NI ». Dans Computer Aided Innovation of New Materials, 327–30. Elsevier, 1991. http://dx.doi.org/10.1016/b978-0-444-88864-8.50072-8.

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Olalekan Raimi, Morufu, Henry Olawale Sawyerr, Ifeanyichukwu Clinton Ezekwe et Salako Gabriel. « Toxicants in Water : Hydrochemical Appraisal of Toxic Metals Concentration and Seasonal Variation in Drinking Water Quality in Oil and Gas Field Area of Rivers State, Nigeria ». Dans Heavy Metals - New Insights [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.102656.

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Groundwater pollution is a major issue in many tropical countries. Governments at all levels are doing little or nothing to supply inhabitants with clean and accessible water, particularly in Nigeria’s Niger Delta region. This study compares differences in water quality parameters in the study area (determine the level of pollutions in the different sites). The investigation made use of standard analytical methodologies. All sampling, conservation, transportation as well as analysis followed the usual APHA procedures (2012). To prevent degradation of the organic substances, all obtained samples were transferred to the laboratory, while keeping in an icebox. Result shows that during wet season, the mean values obtained for water quality parameters were significantly lower in site 9 compared with that obtained in other sites (p < 0.05) with the exemptions of temperature, DO, BOD, COD, acidity, TH, TDS, K, Mg, Zn, Mn, Cd, Pb, Cu, Cr, NH3, NO2, NO3, Ni though slightly lower in most cases in site 9 were not significantly different (p > 0.05) and both alkalinity and SO4 which were significantly higher in site 9 than site 1 (p < 0.05). Result obtained during dry season reveals that there is no remarkable difference in pH, acidity, Pb and Ni between the nine sites (p > 0.05) while other water quality parameters were significantly lower in site 9 than other sites excluding Cl and Mg which were both significantly higher in site 9 than site 8 (p < 0.05). Extra efforts must be made to completely understand the hydrogeochemical properties and appropriateness of groundwater in Nigeria’s core Niger Delta region in order to ensure quality groundwater supply for varied applications. As a result, this research will contribute to the establishment of a quantitative understanding of the effects of many causes on groundwater level changes in every aquifer worldwide. This analysis also reinforces a useful resource for scholars, activists, and public officials looking to improve community awareness, planning, and performance. The verdicts will serve as a valuable guideline for policymakers, the Ministry of Water Resources, and development practitioners, as they highlight the need for appropriate approaches to mitigating toxic elements of water resource contamination in the core Niger Delta in order to protect public health from carcinogenic and non-carcinogenic risks.
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Actes de conférences sur le sujet "Cu CODH"

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Ito, Takahiro. « R&D of the Next Generation Safety Analysis Methods for Fast Reactors With New Computational Science and Technology : 5 — Study of Eutectic Reaction Between Metals : Classical Molecular Dynamics Approach ». Dans 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48500.

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Molecular dynamics study on eutectic phenomena between two metal materials is performed for development of a new MPS-based code named ‘COMPASS’ [1] being developed for meso-scale analysis of core disruptive accidents in Sodium-cooled fast reactor. In this study, Cu-Ag system is simulated by classical molecular dynamics to provide knowledge on detailed mechanisms on the inception and extension of eutectic melting. Embedded Atom Method [2] which has been used in many studies associated with atomic behavior of metals is applied. First, melting temperature of solid solution of Cu-Ag binary system is investigated. The analytical result on the dependence of the melting temperature on the atomic fraction of Cu shows good agreement with the experiments. The melting behavior on the interface between two pure Cu and Ag slabs are then simulated. It is shown that the melting temperature at the interface is lowered depending on the local value of the atomic fraction there and is almost identical to that of solid solution with the corresponding atomic fraction.
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Kim, Jongmin, et Bongsang Lee. « Probabilistic Fracture Mechanics Analysis of Boiling Water Reactor Vessel on Relatively Low Failure Probability Problem Using PROFAS-RV PFM Analysis Code ». Dans ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65225.

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The PFM approach has been widely used to evaluate the integrity of reactor pressure vessel (RPV) in nuclear power plant. Since the 1980s, a number of probabilistic fracture mechanics (PFM) analysis codes have been developed to perform the probabilistic analysis for RPV, and these codes are continuously updated by reflecting recent irradiation shift model, database of fracture toughness and compendia of stress intensity factors. The author developed a PFM analysis program for RPV, PROFAS-RV (PRObabilistic Failure Analysis System for Reactor Vessel), recently, which can evaluate failure probability of RPV using recent RTNDT shift model of 10CFR50.61a and stress intensity factor calculation method of RCC-MRx A16 code as well as required basic functions of PFM program. In this paper, the failure probabilities of boiling water reactor (BWR) for cool-down and low temperature over pressurization (LTOP) transient are calculated by using the own PFM analysis code, PROFAS-RV. This work was conducted as part of an international collaborative study. The effects of key parameters such as transient, fluence level, Cu and Ni content, initial RTNDT and RTNDT shift model on the failure probability are systematically compared and reviewed. As expected, the failure probability increases with increasing fluence, Cu and Ni contents, and initial RTNDT. However, the effect of Cu and Ni content is negligible for the very low fluence of 0.02×1019 n/cm2 because there is no additional irradiation embrittlement. The effect of initial RTNDT on the failure probability is more significant for the lower fluence region in both transients. The failure probability of LTOP transient is lower than that of cool-down transient, and the probability of failure with irradiation shift model of 10CFR50.61a is larger than that of R.G.-1.99 rev. 2 at the fluence ranges 0.2×1019 n/cm2 to 0.5×1019 n/cm2.
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Amano, R. S., J. Xie, E. K. Lee et P. K. Rohatgi. « CFD Simulation and Experimental Validation of Solidification of Metal Matrix Composites (MMC) in the Presence of Cooled Fibers ». Dans ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60290.

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A new experimental configuration for the casting of metal matrix composites (MMCs) using Al-4.5 wt pct Cu have been used to obtain finer microstructures around the fiber reinforcement. The new configuration allows the fibers to be extended out the mold and cooled by a heat sink. By doing so, the solidification can be made more rapid, and more primary alpha-aluminum phase can be formed on the surface of the fibers. It is believed that this can lead to improvement in the properties of the composite. CFD simulation of the solidification of Al-4.5 wt pct Cu in the casting process has been carried out by using commercial CFD code. Parametric studies on the effects of different processing parameters on solidification time have been simulated using the CFD code. These parameters include, but are not limited to, the pouring temperature of the liquid melt, sink temperature, fiber length extended out of the mold, the mold initial temperature, fiber conductivity, applied pressure, and fiber bundle diameter. Selected simulation results are compared with the available experimental data obtained from the UWM Center for Composites.
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Barradas, S., R. Molins, M. Jeandin, M. Arrigoni, M. Boustie, C. Bolis, L. Berthe et M. Ducos. « Laser Shock Flier Impact Simulation of Particle-Substrate Interactions in Cold Spray ». Dans ITSC2005, sous la direction de E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p0343.

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Abstract Coating-substrate adhesion in cold spray is a paramount property, the mechanisms of which are not yet well elucidated. These mechanisms are governed by metallurgical and morphological phenomena occuring when cold-sprayed particles impinge on the substrate. To go into these mechanisms, due to the intrinsic characteristics of the cold spray process, i.e. the low-temperature and high velocity of the particles, direct observation and control of inflight particles and related phenomena (especially when impinging) cannot be done easily. For this reason, an experimental simulation of the particle-substrate reactions at the particle impingement was developed. This simulation is based on original filter impact experiments from laser shock acceleration of plates/foils (fliers). These were applied to the Cu-Al metallurgically-reactive system to simulate Cu cold-sprayed onto Al. The velocity of the plate was selected in the range of actual cold spray velocities. Relevant Cu-Al interaction phenomena were featured and studied as a function of filter impact conditions, i.e., primarily, shearing, plastic deformation, phase transformation (including rapid melting/solidification and formation of intermetallics). These phenomena were shown to be similar to those involved in cold spray. This was ascertained by a parallel study of cold-sprayed Cu coating of Al using SEM, TEM, EPMA, and an energy balance and diffusion calculations. In addition, this simulation can be used to feed FE modeling of cold spray particle impingement on the substrate. Preliminary results are discussed from modeling using the “RADIOSS®” code. More generally, laser shock flier impact experiments were demonstrated to result in a powerful tool capable of simulating cold spray coating-substrate interface mechanisms. Major assets rest on their high significance, reproducibility, flexibility and potential for substituting for direct laborious cold spray optimization testing.
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Nishimura, Arata, et Hideo Nakajima. « JSME Construction Standard for Superconducting Magnet of Fusion Facility “MATERIAL” ». Dans ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77825.

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A construction standard for a large superconducting magnet for a fusion device has been established by Japan Society of Mechanical Engineers in Japan. This paper describes the outline of the part of “Material” and interprets some special features provided in the standard. The standard was composed based on Japan Industrial Standard. The materials used for the superconducting magnet structure was limited and divided into two groups. The first group is for the materials of which cryogenic strength are not limited and will be used under the design with the strength at room temperature. The other group composes of the materials of which cryogenic strength are provided. The former group includes forged austenitic stainless steel, Inconel 718, Ni and Ni alloy, Cu and Cu alloy and welding wires for these materials. The latter group holds cryogenic structural materials, such as JJ1 and 316LN steels. The design strength of these materials is given in a quadratic function from room temperature to cryogenic temperature when the material is used in an as-solution heat treated condition. The standard also equips the process to register the new materials. One shall be able to prepare the data set necessary to make registration, and submit to the JSME Code Committee to register the materials with the standard.
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Rule, William Keith. « Modeling of Sleeved Taylor Impact Specimens ». Dans ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-1824.

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Recently experimental studies have been conducted using a novel form of the Taylor impact test consisting of sleeved cylinders. A soft material of known properties (OFHC Cu) was used for the core and the tight fitting sleeve was fabricated from the material of interest (AF1410 steel). On impact the mushrooming and sliding core places the sleeve in a stress state not normally found in Taylor impact testing. This paper describes a study conducted to evaluate the feasibility of backing out Johnson-Cook strength model coefficients from measured (post-test) deformed geometries of sleeved specimens using an explicit impact code (EPIC). In addition, modifications to the sleeved concept geometry (tapered and capped core) are also explored numerically as well as the sleeve/core sliding friction coefficient.
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Burkett, M. W. « Eulerian Hydrocode Modeling of a Dynamic Tensile Extrusion Experiment ». Dans 2019 15th Hypervelocity Impact Symposium. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/hvis2019-057.

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Abstract Eulerian hydrocode simulations using the Mechanical Threshold Stress (MTS), Zerilli-Armstrong (Z-A), and Johnson Cook (J-C) flow stress models were performed to provide insights into dynamic tensile extrusion (DTE) experiments with copper (Cu) and tantalum (Ta). The extrusion of Cu and Ta projectiles was simulated with an explicit, two-dimensional Eulerian continuum mechanics hydrocode and compared with data to determine if this extrusion concept is a useful indirect hydrocode material strength model evaluation experiment. The data consisted of high-speed images of the extrusion process, photon Doppler velocimetry (PDV) to measure the projectile velocity history and die transit time, dynamic temperature measurements of the extruded material, recovered extruded samples, and post-test metallography. The hydrocode was developed to predict large-strain and high-strain-rate loading problems. The code features a high-order advection algorithm, material interface tracking scheme, and van Leer monotonic advection-limiting algorithm. The strength models were utilized to evolve the flow stress (σ) as a function of strain, strain rate, and temperature. Average strain rates on the order of 104 s−1 and plastic strains exceeding 300% were predicted in the extrusion of copper at impact velocities between 400–450 m/s, while plastic strains exceeding 800% were predicted for Ta. The predicted and measured deformation topologies, projectile velocity profiles and die transits times, plastic strains, and temperatures were qualitatively compared. The flow stress distributions predicted by the three strength models were also compared for one experiment. Finally, the feasibility of using DTE to evaluate hydrocode strength models will be discussed.
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Matsuzawa, Hiroshi, et Toru Osaki. « Fracture Toughness of Highly Irradiated Pressure Vessel Steels in the Upper Shelf Temperature ». Dans ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93032.

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Nine Reactor Pressure Vessel (RPV) Steels and four RPV weld were irradiated up to 1.2 × 1024n/m2 fast neutron fluence (E&gt;1MeV), and their fracture toughness and Charpy impact energy were measured. As chemical compositions, such as Cu, are known to affect the fracture toughness reduction due to neutron exposure, the above steels were fabricated by changing chemical composition widely to cover the chemical composition of the RPV materials of the operating Japanese nuclear power plants. 2.7 mm thick compact specimens were used to measure the upper shelf fracture toughness of highly irradiated materials, and their Charpy upper shelf energy was also measured. By correlating Charpy upper shelf energy to fracture toughness, the upper shelf fracture toughness evaluation formulae for highly irradiated reactor pressure vessel steels were developed. Both compact and V-notched Charpy impact specimens were irradiated in a test reactor. The fast neutron flux above 1MeV was about 5 × 1016n/(m2s). Charpy impact specimens made of Japanese PWR reference material containing 0.09w% Cu were irradiated simultaneously. The upper shelf energy of the reference material up to the medium fluence level showed little difference in the reduction of upper shelf energy to that which had been in the operating plant and which was irradiated to the same fluence. The developed correlation formulae have been adopted in the Japan Electric Association Code as new formulae to predict the fracture toughness in the upper shelf region of reactor pressure vessels. They will be applied to time limited ageing analysis of low upper shelf reactor pressure vessels in Japan, on a concrete technical basis in very high fluence regions.
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Peiman, W., Eu Saltanov, L. Grande, I. Pioro, B. Rouben et K. Gabriel. « Power Distribution and Fuel Centerline Temperature in a Pressure-Tube Supercritical Water-Cooled Reactor (PT SCWR) ». Dans 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icone20-power2012-54596.

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SuperCritical Water-cooled nuclear Reactor (SCWR) designs are one of six nuclear-reactor concepts being developed under the Generation IV International Forum (GIF) initiative. A generic pressure-tube SCWR consists of distributed fuel channels with coolant inlet and outlet temperatures of 350 and 625°C at 25 MPa, respectively. Such reactor coolant outlet conditions allow for high thermal efficiencies of SCW Nuclear Power Plant (NPP) of about 45–50%. In addition to high thermal efficiencies, SCWR designs provide the means for co-generation of hydrogen through thermochemical processes such as the Cu–Cl cycle. The main objective of this paper is to determine the power distribution inside the core of an SCWR by using a lattice code - DRAGON and a diffusion code - DONJON. As a result of these calculations, heat-flux profiles in all fuel channels were determined. Consequently, the heat-flux profile in a channel with the maximum thermal power was used as an input into a thermal-hydraulic code, which was developed in MATLAB in order to calculate a fuel centerline temperature for UO2 and UC nuclear fuels. Results of an analysis showed that the fuel centerline temperature of UC was significantly lower than that of UO2. This paper also studies effects of energy groups on multi-group diffusion calculations and proposes nine energy groups for further neutronic studies related to SCWRs.
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Komai, N., F. Masuyama, S. Yamamoto et M. Igarashi. « 10-Year Experience With T23(2.25Cr-1.6W) and T122(12Cr-0.4Mo-2W) in a Power Boiler ». Dans ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2571.

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Tungsten strengthened ferritic steels, 2.25Cr-1.6W-V-Nb and 12Cr-0.4Mo-2W-V-Nb-Cu have been developed and approved by the ASME Boiler and Pressure Vessels Code Committee for use in Section I construction, designated as T23 and T122 respectively. A field exposure test installing both steel tubes in service along with comparative materials in the tertiary superheater and secondary reheater of a 156MW utility power boiler has been conducted since April 1993. The tubes were removed to confirm their material properties and corrosion/steam oxidation behaviors after one-year, 3-year, 6-year and 10-year periods of service. The tensile and creep rupture strengths of both steels showed no remarkable change during service. Examination of steam oxidation scale on the inner surface of the tubes indicated that the scale growth rate of T122 was extremely small following one-year service. The growth rate and morphology of steam oxidation scale is discussed, as compared with conventional materials.
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