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Search Results: 1 - 10 of 512882 matches for " A. -I. Etienvre "
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Status report on the NEMO3 experiment
Anne-Isabelle Etienvre
Physics , 2003,
Abstract: The NEMO3 detector, now operating in the Frejus Underground Laboratory, is devoted to search for neutrinoless double beta decay; the expected sensitivity for the effective neutrino mass is on the order of 0.1 eV. The performances of the tracking detector are presented. The first and very preliminary results concerning the background and the double beta signal are given.
Possible background reductions in double beta decay experiments
R. Arnold,C. Augier,J. Baker,A. Barabash,O. Bing,V. Brudanin,A. J. Caffrey,E. Caurier,K. Errahmane,A. -I. Etienvre,J. L. Guyonnet,F. Hubert,Ph. Hubert,C. Jollet,S. Jullian,O. Kochetov,V. Kovalenko,D. Lalanne,F. Leccia,C. Longuemare,Ch. Marquet,F. Mauger,H. W. Nicholson,H. Ohsumi,F. Piquemal,J-L. Reyss,X. Sarazin,Yu. Shitov,L. Simard,I. Stekl,J. Suhonen,C. S. Sutton,G. Szklarz,V. Timkin,V. Tretyak,V. Umatov,L. Vala,I. Vanyushin,V. Vasilyev,V. Vorobel,Ts. Vylov
Physics , 2003, DOI: 10.1016/S0168-9002(03)00992-6
Abstract: The background induced by radioactive impurities of $^{208}\rm Tl$ and $^{214}\rm Bi$ in the source of the double beta experiment NEMO-3 has been investigated. New methods of data analysis which decrease the background from the above mentioned contamination are identified. The techniques can also be applied to other double beta decay experiments capable of measuring independently the energies of the two electrons.
Tevatron-for-LHC Report: Top and Electroweak Physics
Gerber, C. E.;Murat, P.;Tait, T. M. P.;Wackeroth, D.;Arbuzov, A.;Bardin, D.;Baur, U.;Benitez, J. A.;Berge, S.;Bondarenko, S.;Boos, E. E.;Bowen, M. T.;Brock, R.;Bunichev, V. E.;Campbell, J.;Canelli, F.;Cao, Q. -H.;Calame, C. M. Carloni;Chevallier, F.;Christova, P.;Ciobanu, C.;Dittmaier, S.;Dudko, L. V.;Ellis, S. D.;Etienvre, A. I.;Fiedler, F.;Garcia-Bellido, A.;Giammanco, A.;Glenzinski, D.;Golonka, P.;Hays, C.;Jadach, S.;Jain, S.;Kalinovskaya, L.;Kramer, M.;Lleres, A.;Luck, J.;Lucotte, A.;Markina, A.;Montagna, G.;Nadolsky, P. M.;Nicrosini, O.;Olness, F. I.;Placzek, W.;Sadykov, R.;Savrin, V. I.;Schwienhorst, R.;Sherstnev, A. V.;Slabospitsky, S.;Stelzer, B.;Strassler, M. J.;Sullivan, Z.;Tramontano, F.;Vicini, A.;Wagner, W.;Was, Z.;Watts, G.;Weber, M.;Willenbrock, S.;Yang, U. K.;Yuan, C-P.;Zhu, J.
High Energy Physics - Phenomenology , 2007,
Abstract: The top quark and electroweak bosons (W and Z) represent the most massive fundamental particles yet discovered, and as such refer directly to the Standard Model's greatest remaining mystery: the mechanism by which all particles gained mass. This report summarizes the work done within the top-ew group of the Tevatron-for-LHC workshop. It represents a collection of both Tevatron results, and LHC predictions. The hope is that by considering and comparing both machines, the LHC program can be improved and aided by knowledge from the Tevatron, and that particle physics as a whole can be enriched. The report includes measurements of the top quark mass, searches for single top quark production, and physics of the electroweak bosons at hadron colliders.
Measurement of double beta decay of 100Mo to excited states in the NEMO 3 experiment
R. Arnold,C. Augier,J. Baker,A. S. Barabash,M. Bongrand,G. Broudin,V. Brudanin,A. J. Caffrey,V. Egorov,A. I. Etienvre,N. Fatemi-Ghomi,F. Hubert,Ph. Hubert,J. Jerie,C. Jollet,S. Jullian,S. King,O. Kochetov,S. I. Konovalov,V. Kovalenko,D. Lalanne,T. Lamhamdi,F. Leccia,Y. Lemi`ere,C. Longuemare,G. Lutter,Ch. Marquet,F. Mauger,A. Nachab,H. Ohsumi,F. Perrot,F. Piquemal,J. L. Reyss,J. S. Ricol,R. Saakyan,X. Sarazin,L. Simard,F. Simkovic,Yu. Shitov,A. Smolnikov,S. S"oldner-Rembold,I. Stekl,J. Suhonen,C. S. Sutton,G. Szklarz,J. Thomas,V. Timkin,V. Tretyak,V. Umatov,L. V'ala,I. Vanyushin,V. Vasiliev,V. Vorobel,Ts. Vylov
Statistics , 2006, DOI: 10.1016/j.nuclphysa.2006.09.021
Abstract: The double beta decay of 100Mo to the 0^+_1 and 2^+_1 excited states of 100Ru is studied using the NEMO 3 data. After the analysis of 8024 h of data the half-life for the two-neutrino double beta decay of 100Mo to the excited 0^+_1 state is measured to be T^(2nu)_1/2 = [5.7^{+1.3}_{-0.9}(stat)+/-0.8(syst)]x 10^20 y. The signal-to-background ratio is equal to 3. Information about energy and angular distributions of emitted electrons is also obtained. No evidence for neutrinoless double beta decay to the excited 0^+_1 state has been found. The corresponding half-life limit is T^(0nu)_1/2(0^+ --> 0^+_1) > 8.9 x 10^22 y (at 90% C.L.). The search for the double beta decay to the 2^+_1 excited state has allowed the determination of limits on the half-life for the two neutrino mode T^(2nu)_1/2(0^+ --> 2^+_1) > 1.1 x 10^21 y (at 90% C.L.) and for the neutrinoless mode T^(0nu)_1/2(0^+ --> 2^+_1) > 1.6 x 10^23 y (at 90% C.L.).
Lorentz Transform in Multi-Dimensional Space  [PDF]
I. A. Urusovskii
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.311217
Abstract: It is shown that in Euclidean space with any number of spatial dimensions more than three, the Lorentz transform holds true if the proper time of each elementary particle is proportional to the length of its path in the extra-dimensional subspace, and all elementary particles move at the speed of light in the complete space. The six-dimensional treatment of the Coulomb force of interaction between two charges is given. The electric force is due to the motion of charges in the extra-dimensional subspace and is equal to the corresponding Lorentz force.
The Fractional Hydrogen Atom: A Paradigm for Astrophysical Phenomena  [PDF]
A. I. Arbab
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.311215
Abstract: We have found that fractional principal quantum numbers are permitted in hydrogen atom which yield the conditions for neutron and white dwarf stars evolution. The number densities of neutron and white dwarf stars reveal that these systems have the maximal conductivity of 1.37×1010Ω-1m-1. They are giant perfect conductors at very high temperature and magnetic field.
Efficiency of Different Vaccination Strategies for Childhood Diseases: A Simulation Study  [PDF]
I. A. Moneim
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.42028
Abstract:

Vaccination strategies are designed and applied to control or eradicate an infection from the population. This paper studies three different vaccination strategies used worldwide for many infectious diseases including childhood diseases. These strategies are the conventional constant vaccination strategy, the periodic step (pulse) vaccination strategy and finally the mixed vaccination strategy of both the constant and the periodic one. Simulation of the different vaccination programs is conducted using three parameter sets of measles, chickenpox and rubella. The Poincaré section is playing as a filter of our simulation results to show a wide range of possible behavior of our model. Critical vaccination level is been estimated from the results to prevent severe epidemics.

Assessment of Genetic Variability of 142 Sweet Sorghum Germplasm of Diverse Origin with Molecular and Morphological Markers  [PDF]
A. Lekgari, I. Dweikat
Open Journal of Ecology (OJE) , 2014, DOI: 10.4236/oje.2014.47034
Abstract:

Sorghum bicolor (L.) Moech is the fifth most important crop in the world. Recently, its agronomics and genetics have drawn interest among scientists. Sweet sorghum, a variety of sorghum, may potentially become a bioenergy source because of the high sugar content in its juicy stems. Exploring the diversity of sweet sorghum around the world is important to the development and improvement of the crop as an energy source. In exploring the diversity of sweet sorghum, three types of markers (simple sequence repeats [SSR], sequence-related amplified polymorphisms [SRAP], and morphological markers) are used on 142 sweet sorghum accessions from around the world. The accessions show a high significance (P < 0.05) for all the morphological traits measured. The morphological markers cluster the accessions into five groups based primarily on plant height (PH), anthesis data (AD), and moisture content (ML), with the principal component analysis (PCA) showing these traits to explain 92.5% of the total variation. The furthest accessions were PI571103 from Sudan, and N99 from the United States. The Nei’s genetic standard distances ranged from 0.024 to 1.135 and 0.078 to 0.866 for SSR and SRAP, respectively. As expected, accessions of the same origin or breeding history had the lowest genetic distance (e.g. Mokula and Marupantse, both from Botswana; NSL83777 and NSL83779 from Cameroon). Neighbor joining clusters the sweet sorghum accessions into five major groups using SSR and four major groups using SRAP, based on their origin, or breeding history. The three marker types complement each other, and the presence of accessions of different origins across clusters indicate similar genetics, and evidence of germplasm movement between countries.

Determination of Molecular Mass of Strong Acids by Differential Temperature Model (DTM) Using H3PO4 and HBF4 for Classical Demonstration  [PDF]
I. A. Akpan
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.36007
Abstract:

A new chemical hypothesis based on the differential temperature model (DTM) for estimation of molecular masses of some strong acids (H2SO4, HNO3 and HCl) in solutions have previously been propounded and tested theoretically and analytically by the author. The results were published in the Bulletin of Pure and Applied Sciences–Chemistry in 2012. The changes in temperature following various dilutions of the acids were found to be proportional to their molecular properties. The new chemical hypothesis and model is hereby tested on H3PO4 and HBF4 and their exact molecular masses have been evaluated analytically and theoretically. The validity of the hypothesis and the model is hereby presented for chemical proof and adoption to theory by chemists.

Multidimensional Treatment of the Observed Dependence of the Speed of Photon on Its Energy  [PDF]
I. A. Urusovskii
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.69126
Abstract: Agreed with the Lorentz transformations, a multidimensional treatment of motion of elementary particles with the fundamental speed (upper limit of the speed of light) in six-dimensional Euclidean space in Compton neighborhood of observed three-dimensional space is given. Thereby it is supposed that the proper time of any elementary particle is proportional to the path traversed by it in the extra space. By the available experimental data [1], these suppositions are allowed to find the photon proper energy, 1.44 × 10-5 eV. It is shown that the difference between the fundamental speed and speed of high-energy photons, in the projection on the three-dimensional space, is negligibly small.
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