1,226 research outputs found
Solving AX-equations
No full textTitle: Solving AX-equations Author: Jan Butora Department: Department of algebra Supervisor: doc. RNDr. Jiří Tůma, DrSc., Department of algebra Abstract: In this work, we present concept of AX-equations and focus on two such equations. Using similiar techniques, we build a theory for both equations, which allows us to express number of their solutions based only on their parameters. Using this theory, we demonstrate on an example that differential steps, used in differential cryptanalysis of modular addition, are not independent. Moreover, based on this theory we introduce and implement fast algorithms for searching solutions. Keywords: differential cryptanalysis, AX-equations, modular addition, carry, sol- vability conditio
Theoretical investigation on radiation tolerance of Mn+1 AX(n) phases
No full textTernary M(n + 1)AX(n) phases with layered hexagonal structures, as candidate materials used for next-generation nuclear reactors, have shown great potential in tolerating radiation damage due to their unique combination of ceramic and metallic properties. However, Mn + 1AXn materials behave differently in amorphization when exposed to energetic neutron and ion irradiations in experiment. We first analyze the irradiation tolerances of different M(n + 1)AX(n) (MAX) phases in terms of electronic structure, including the density of states ( DOS) and charge density map. Then a new method based on the Bader analysis with the first-principle calculation is used to estimate the stabilities of MAX phases under irradiation. Our calculations show that the substitution of Cr/V/Ta/Nb by Ti and Si/Ge/Ga by Al can increase the ionicities of the bonds, thus strengthening the radiation tolerance. It is also shown that there is no obvious difference in radiation tolerance between Mn (+ 1)AC(n) and Mn (+ 1)AN(n) due to the similar charge transfer values of C and N atoms. In addition, the improved radiation tolerance from Ti3AlC2 to Ti2AlC ( Ti3AlC2 and Ti2AlC have the same chemical elements), can be understood in terms of the increased Al/TiC layer ratio. Criteria based on the quantified charge transfer can be further used to explore other M(n + 1)AX(n) phases with respect to their radiation tolerance, playing a critical role in choosing appropriate MAX phases before they are subjected to irradiation in experimental test for future nuclear reactors
Ab initio study of irradiation tolerance for different M(n+1)AX(n) phases: Ti3SiC2 and Ti3AlC2
No full textLayered ternary M(n+1)AX(n) (MAX) materials are recently proposed to be promising candidates for future fission and fusion programmes because of their unique properties inherited from both ceramics and metals. However, different M(n+1)AX(n) materials demonstrate different behaviors when exposed to energetic neutron or ion irradiations. Based on first-principles calculations, we have investigated the irradiation tolerance of two typical M(n+1)AX(n) materials: Ti3SiC2 and Ti3AlC2 from two aspects. First, we make a detailed analysis on the interatomic bonding characters, which are believed to be responsible for the resistance to radiation-induced amorphization. Second, the formation energies of various intrinsic and antisite defects in these two compounds are calculated in order to elucidate their amorphization mechanism. Our results show that the absence of orbitals overlap of Al-C in Ti3AlC2 renders it more resistant to amorphization compared to Ti3SiC2. In addition, the antisite defects Al-Ti(1) and Al-Ti(2) in Ti3AlC2 have much lower formation energies compared to Si-Ti(1) and Si-Ti(2) in Ti3SiC2, which implies that the replacement of Ti with Al is easier than Si, thus providing an alternative way to accommodate the defects resulted from irradiation damage cascades. These results indicate that Ti3AlC2 is more irradiation tolerant than Ti3SiC2, in accordance with experimental observations. Our results have profound implications for the choice of appropriate MAX phase with best performance to be used in next reaction reactors. (C) 2014 AIP Publishing LLC
Implementación de ERP Dynamics AX 2012 R2
No full textEl presente trabajo presenta la implementación del nuevo ERP brinda el soporte tecnológico para agilitar
este proceso de clasificado, puesto que la infraestructura de Axapta 4.0 la cual, en vista del
crecimiento organizacional que han tenido, no facilita las tareas de registro
generando en inconsistencia de datos ya que sus servidores y la capacidad de
versión de su ERP está al máximo, razón por la cual ha decidido migrar a la
nueva versión Dynamics AX 2012 R2.
Para esta implementación se utilizó la metodología de implementación de
ERP's creada por Microsoft “SURESTEP” la cual indica paso a paso los
procesos a seguir para la correcta implementación de esta versión AX 2012 R2
en función de la documentación que esta solicita siendo de vital importancia la
etapa de Diseño en la cual, se complementará con el uso de herramientas para
tomas de decisiones para brindar una mejora tanto operativa como tecnológica
Minding the aesthetic: The place of the literary in education and research.
No full textThe article discusses the significance of aesthetic as a mode of cognition and means of social cohesion. It notes the relation of aesthetic knowledge with the perception or intuition, the emergence of such awareness into something durable and the response to the embodiment. It describes the evolution of aesthetic delight in the human species, the sense of sense of beauty arising on one's realization of the formal qualities of something, through the poem presented by the author on achievement
ko-ax photo [Selected by Tate Curator of Photography, Simon Baker]
No full textko-ax photo was an open submission competition selected by Simon Baker (Curator of Photography, Tate), Sue Steward (Photography critic, Telegraph, Observer, Guardian, BBC) and John Gill (Curator Brighton Photo Biennial and Founder Photoworks). The 10 artists selected all presented fascinating artworks that conceal narratives and ask questions of the viewer. Questions of beauty, family, decay and fantasy were all explored across over 50 works.</p
Preconditioning Large Scale Iterative Solution of Ax = b Using a Statistical Method with Application to Matrix-Free Spectral Solution of Helmholtz Equation
No full textAbstractThe problem of preconditioning the linear system Ax = b where no entries of A are known but the matrix-vector product is given in the linear functional form Ax = L(x) is considered. A statistical multiregressor method is proposed whose convergence improves during Krylov iterations. It is shown that this method effectively improves the rate of convergence of the GMRES algorithm. The results are validated by applying the current preconditioner to a pseudo-spectral solution of Helmholtz equation
Finite element analysis of deep drawing and ironing process in the steel D & I canmaking
No full textThe bodymaking of D&I can consists of a deep drawing process, a redrawing process and a multi-stage wall ironing process. From the viewpoint of mechanics, it can be classified into a complicated high-speed forming process, including nonlinear and coupled thermal-mechanical contact problem. In this study, an ax isymmetric non-isothermal finite element analysis using the FEA code ABAQUS has been conducted to analyze the continuous steel D&I canmaking process from deep drawing to three stages of wail Ironing. information on punch load histories, stress/strain distributions and temperature increases are obtained from the analysis. To compare the results from the FE analysis, canmaking experiments utilizing a pilot canmaking line are also carried out. The material considered is a tinplate, a type of low carbon steel for the commercial production of steel D&I can.X114sciescopu
Factores de éxito en la implementación del ERP Microsoft Dynamics AX – Caso de estudio: Empresa manufacturera
No full textCon los años, los sistemas de información se han convertido en herramientas que le permiten a las compañías tomar decisiones oportunas para prestar un buen servicio a sus clientes y enfrentar los retos que se presentan en una economía que cada vez es más competitiva. Los sistemas de planificación de recursos empresariales (ERP) son soluciones que integran la información generada por los procesos productivos, administrativos y comerciales, evitando reprocesos y duplicidad en los datos. El propósito de este trabajo es mostrar los resultados del análisis realizado para identificar los factores críticos de éxito en los proyectos de implementación del Sistema de Planificación de Recursos Empresariales (ERP) Microsoft Dynamics AX en una empresa de producción colombiana. El trabajo se presenta en cuatro capítulos. Inicialmente, se realiza una introducción a los conceptos de sistemas de información y ERP. A continuación, se describe la metodología utilizada para el estudio, la selección del modelo a partir de la revisión de literatura, la construcción del instrumento y la recolección de datos a través de dos encuestas de percepción. Posteriormente se realiza el análisis de la información y por último las conclusiones y recomendaciones del trabajo.Abstract: Over the years, information systems have become tools that allow companies to make timely decisions, to provide a good service to their customers and face the challenges that arise in an economy increasingly competitive. Enterprise resources planning systems (ERP) are solutions that integrate the generated information by the productive, administrative and commercial processes, avoiding reprocessing and duplicity on data. The purpose of this project is to present the results of the analysis conducted in a Colombian manufacturing company. In order to identify the critical success factors in projects where the Enterprise Resources Planning System (ERP) Microsoft Dynamics AX is implemented. This work is present into four main sections. The first one explains the concepts of information systems and ERP. The second one, it is described the methodology used for the study, the selection of the model from the literary review, the construction of the instrument and the collection of the data through two perception surveys. The third one, it is the analysis of the information and finally, the conclusions and recommendations.Maestrí
Kün Sarığ Han: Bir Hakas Kadınının Destanı ve Türkiye’de Yayımlanmış Hakas Şaman Mitolojisi Eserleri Üzerine
No full textRusya Federasyonu dahilinde bulunan ve coğrafya bakımından Asya kıtasının kalbinde konumlanan Hakas Cumhuriyeti'nin büyük halk ozanları arasında yer alan ünlü Hakas destancı Obdo N. Kulagaşeva'nın anlattığı ve asıl adı Ax Saraattığ Kün Sarığ olan Kün Sarığ Han: Bir Hakas Kadınının Destanı adlı destan 2021'de Türkiye Cumhuriyeti'nin başkenti Ankara'da Türk Kültürünü Araştırma Enstitüsü Yayınları'ndan çıkmıştır
- …
