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Search Results: 1 - 10 of 74 matches for " DSM-DAPNIA-SEA "
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Design of the Ess RFQs and Chopping Line
R. Duperrier,R. Ferdinand,P. Gros,J-M. Lagniel,N. Pichoff,D. Uriot,CEA-Saclay,DSM-DAPNIA-SEA
Physics , 2000,
Abstract: The chopping line is a critical part of the ESS linac in term of technical realisation of the choppers and preservation of the beam qualities. A new optimised design of the ESS RFQs and chopping lines is reported. The beam dynamics has been optimised with H- beam currents up to 100-mA to have safety margin with respect to the ESS goals. The first RFQ transmits almost 99.7% of the beam up to 2 MeV. The line with two choppers allows a perfect chopping between 2 bunches. The second RFQ accelerates the particles up to 5 MeV with a transmission close to 100%.
Status Report on the 5 Mev Iphi RFQ
R. Ferdinand,P-Y. Beauvais,R. Duperrier,A. France,J. Gaiffier,J-M. Lagniel,M. Painchault,F. Simoens,CEA-Saclay,DSM-DAPNIA-SEA,P. Balleyguier,CEA-Bruyeres le Chatel,DAM
Physics , 2000,
Abstract: A 5-MeV RFQ designed for a proton current up to 100-mA CW is now under construction as part of the High Intensity Proton Injector project (IPHI). Its computed transmission is greater than 99 %. The main goals of the project are to verify the accuracy of the design codes, to gain the know-how on fabrication, tuning procedures and operations, to measure the output beam characteristics in order to optimise the higher energy part of the linac, and to reach a high availability with minimum beam trips. A cold model has been built to develop the tuning procedure. The present status of the IPHI RFQ is presented.
Building a Network Based Laboratory Environment
Sea Shuan Luo
International Journal of Cyber Society and Education , 2009,
Abstract: This paper presents a comparative study about the development of a network based laboratory environment in the “Unix introduction” course for the undergraduate students. The study results and the response from the students from 2005 to 2006 will be used to better understand what kind of method is more suitable for students. We also use the data collected to adjust our teaching strategy and try to build up a network based laboratory environment.
An alternative to relativistic transformation of special relativity based on the first principles
Young-Sea Huang
Physics , 2008,
Abstract: A new relativistic transformation in the velocity space (here named the differential Lorentz transformation) is formulated solely from the principle of relativity and the invariance of the speed of light. The differential Lorentz transformation is via transforming physical quantities, instead of space-time coordinates, to make laws of nature form-invariant. The differential Lorentz transformation may provide a way to resolve the incompatibility of the theory of special relativity and the quantum theory.
Is the phase of plane waves an invariant?
Young-Sea Huang
Physics , 2009, DOI: 10.1515/zna-2010-8-901
Abstract: Based on the invariance of the phase of waves, plane waves was shown to propagate with negative frequencies in a medium which moves at superluminal speeds opposite to the propagation direction of plane waves. The validity of the invariance of the phase of plane waves was then called into question. A radical change of the conventional concept of plane waves is recently proposed to solve the problem of negative frequency of waves. Here, we point out flaws in that proposal. Thus, the validity of the invariance of the phase of plane waves remains questionable.
Relativistic quantum mechanics and relativistic quantum statistics based upon a novel perspective on relativistic transformation
Young-Sea Huang
Physics , 2012,
Abstract: A novel perspective on relativistic transformation recently-proposed provides an insight into the very meaning of the principle of relativity. With this novel perspective and Bell's theorem, we argue that special relativity, instead of quantum theory, should be radically reformulated to resolve inconsistencies between the two theories. A new theory of relativistic quantum mechanics is formulated upon this novel perspective. This new relativistic quantum mechanics is free from such anomalies as the negative probability density, the negative-energy states, Zitterbewegung, and the Klein paradox deep-rooted in the current relativistic quantum mechanics. Moreover, a remarkable result is found that a particle can not be confined within an infinite square well of width less than half of the Compton wavelength. As implications in nuclear physics, there is a lower bound on the size of atomic nucleus. Neither an electron, nor a positron, can be confined inside the nucleus by whatever interaction. Furthermore, we argue that the postulates of non-relativistic quantum statistics fulfill the principle of relativity, as extended to the relativistic realm. A new theory of relativistic quantum statistics is formulated such that the probability distribution functions are the same as the three well-known probability distribution functions in non-relativistic quantum statistics. A relativistic speed distribution of a dilute gas is then derived by the new relativistic quantum statistics and the new relativistic quantum mechanics. This relativistic speed distribution reduces to Maxwell speed distribution in the low temperature region. Yet, this relativistic speed distribution differs remarkably from J\"uttner speed distribution in the high temperature region. Also, thermal properties of a dilute gas are studied by the new relativistic quantum statistics.
Reply to the comment on "Exact Expression for Radiation of an Accelerated Charge in Classical Electrodynamics"
Young-Sea Huang
Physics , 2013,
Abstract: Flaws and ambiguities are pointed out upon examining the comment attempting to solve a problem as raised recently --- the currently accepted formulation of electromagnetic radiation of an accelerated charge violates the principle of conservation of energy. This problem is not solved by the comment, due to a misunderstanding in the meaning of the total radiated power crossing a sphere. An experiment is suggested to determine whether on not the currently accepted formulation is valid.
Reply to "A first principles derivation of the electromagnetic fields of a point charge in arbitrary motion"
Young-Sea Huang
Physics , 2011,
Abstract: We wish that this reply will initiate further examination on the currently-accepted formulation of electromagnetic radiation from an accelerated point charge. Further examination will at least clarify some ambiguities and misunderstanding in the current formulation, if the current formulation is indeed correct.
Towards an Infrastructure-less SOA for Mobile Web Service Composition
Chii Chang,Sea Ling
Computer Science , 2013,
Abstract: Service composition enables customizable services to be provided to the service consumers. Since the capabilities and the performances of mobile devices (e.g., smart phone, PDA, handheld media player) have improved, a mobile device can be utilized to interact with external mobile service providers towards providing composite Web service to remote clients. Existing approaches on mobile-hosted service composition are usually platform dependent, and rely on centralized infrastructure. Such approaches are not feasible in an open, mobile infrastructure-less environment, in which networked services are implemented using different technologies, devices are capable of dynamically joining or leaving the network, and a centralized management entity is nonexistent. This paper proposes a solution to enable mobile Web service composition in an open, infrastructure-less environment based on loosely coupled SOA techniques.
Perception des perturbations climatiques, savoirs locaux et stratégies d’adaptation des producteurs agricoles Béninois
DSM Agossou, CR Tossou, VP Vissoh, KE Agbossou
African Crop Science Journal , 2012,
Abstract: Le diagnostic fait sur les effets du changement climatique au Bénin, montre que la sécheresse, les pluies tardives et violentes et les inondations sont trois risques climatiques majeurs. Les effets profonds du changement climatique sur l’agriculture, couplés avec la faible résilience et la grande vulnérabilité des populations aux chocs, pourraient réduire considérablement leur capacité de gestion des ressources naturelles et altérer ainsi leurs moyens d’existence, leur sécurité alimentaire et leur bien-être. Il devient impérieux de mieux comprendre les efforts déployés par les cultivateurs pour faire face aux changements climatiques qui les affectent. La présente étude s’intéresse à la compréhension qu’ont les populations locales des manifestations des changements climatiques, de ses effets perceptibles dans le paysage agraire et les mesures qu’elles développent pour y faire face. Elle est basée sur des études qui ont été menées sur 260 producteurs au sud (Adjohoun, Dangbo, Lokossa et Athiémé) et au centre (Glazoué et Savalou) dans diverses zones agro-écologiques du Bénin. Les résultats de ces études ont montré que les populations des zones agro-écologiques les plus vulnérables ont une lecture des phénomènes climatiques essentiellement fondée sur des savoirs localement construits. En effet, plusieurs concepts locaux, adages et proverbes sont utilisés par les communautés rurales pour caractériser les changements observés. Pour y faire face, une variété de stratégies sont localement développées par les producteurs du Sud et du Centre Bénin en fonction de leurs conditions socio-économiques. La connaissance des mécanismes ayant conduit à leur mise au point au Bénin sont des éléments qui pourraient servir de base à des politiques agricoles susceptibles de garantir la sécurité alimentaire malgré les perturbations environnementales observées actuellement au Sud et au Centre Bénin.
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