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Search Results: 1 - 10 of 199736 matches for " Andreas G. Piepke "
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Development of a Gd Loaded Liquid Scintillator for Electron Anti-Neutrino Spectroscopy
Andreas G. Piepke,S. Wayne Moser,Vladimir M. Novikov
Physics , 1999, DOI: 10.1016/S0168-9002(99)00530-6
Abstract: We report on the development and deployment of 11.3 tons of 0.1% Gd loaded liquid scintillator used in the Palo Verde reactor neutrino oscillation experiment. We discuss the chemical composition, properties, and stability of the scintillator elaborating on the details of the scintillator preparation crucial for obtaining a good scintillator quality and stability.
Igreja, Miss o, Antropologia: um balan o do Instituto Anthropos (Alemanha)
Joachim G. Piepke
REVER : Revista de Estudos da Religi?o , 2007,
Abstract:
Neutrinoless double beta decay and direct searches for neutrino mass
Craig Aalseth,Henning Back,Loretta Dauwe,David Dean,Guido Drexlin,Yuri Efremenko,Hiro Ejiri,Steven Elliott,Jon Engel,Brian Fujikawa,Reyco Henning,G. W. Hoffmann,Karol Lang,Kevin Lesko,Tadafumi Kishimoto,Harry Miley,Rick Norman,Silvia Pascoli,Serguey Petcov,Andreas Piepke,Werner Rodejohann,David Saltzberg,Sean Sutton,Petr Vogel,Ray Warner,John Wilkerson,Lincoln Wolfenstein
Physics , 2004,
Abstract: Study of the neutrinoless double beta decay and searches for the manifestation of the neutrino mass in ordinary beta decay are the main sources of information about the absolute neutrino mass scale, and the only practical source of information about the charge conjugation properties of the neutrinos. Thus, these studies have a unique role in the plans for better understanding of the whole fast expanding field of neutrino physics.
Uncertainties in the Anti-neutrino Production at Nuclear Reactors
Z. Djurcic,J. A. Detwiler,A. Piepke,V. R. Foster Jr.,L. Miller,G. Gratta
Physics , 2008, DOI: 10.1088/0954-3899/36/4/045002
Abstract: Anti-neutrino emission rates from nuclear reactors are determined from thermal power measurements and fission rate calculations. The uncertainties in these quantities for commercial power plants and their impact on the calculated interaction rates in electron anti-neutrino detectors is examined. We discuss reactor-to-reactor correlations between the leading uncertainties and their relevance to reactor anti-neutrino experiments.
Detection of very small neutrino masses in double-beta decay using laser tagging
M. Danilov,R. DeVoe,A. Dolgolenko,G. Giannini,G. Gratta,P. Picchi,A. Piepke,F. Pietropaolo,P. Vogel,J-L. Vuilleumier,Y-F. Wang,O. Zeldovich
Physics , 2000, DOI: 10.1016/S0370-2693(00)00404-4
Abstract: We describe an approach to the study of neutrino masses that combines quantum optics techniques with radiation detectors to obtain unprecedented sensitivity. With it the search for Majorana neutrino masses down to $\sim$10 meV will become accessible. The experimental technique uses the possibility of individually detecting $\rm Ba^+$-ions in the final state of $\rm ^{136}Xe$ double-beta decay via resonant excitation with a set of lasers aimed at a specific location in a large Time Projection Chamber. The specificity of the atomic levels provides tagging and, together with more traditional event recognition parameters, greatly suppresses radioactive backgrounds.
Targeting of Synthetic Gene Delivery Systems
Andreas G. Sch tzlein
Journal of Biomedicine and Biotechnology , 2003, DOI: 10.1155/s1110724303209116
Abstract: Safe, efficient, and specific delivery of therapeutic genes remains an important bottleneck for the development of gene therapy. Synthetic, nonviral systems have a unique pharmaceutical profile with potential advantages for certain applications. Targeting of the synthetic vector improves the specificity of gene medicines through a modulation of the carriers' biodistribution, thus creating a dose differential between healthy tissue and the target site. The biodistribution of current carrier systems is being influenced to a large extent by intrinsic physicochemical characteristics, such as charge and size. Consequently, such nonspecific interactions can interfere with specific targeting, for example, by ligands. Therefore, a carrier complex should ideally be inert, that is, free from intrinsic properties that would bias its distribution away from the target site. Strategies such as coating of DNA carrier complexes with hydrophilic polymers have been used to mask some of these intrinsic targeting effects and avoid nonspecific interactions. Preexisting endogenous ligand-receptor interactions have frequently been used for targeting to certain cell types or tumours. Recently exogenous ligands have been derived from microorganisms or, like antibodies or phage-derived peptides, developed de novo. In animal models, such synthetic vectors have targeted remote sites such as a tumour. Furthermore, the therapeutic proof of the concept has been demonstrated for fitting combinations of synthetic vectors and therapeutic gene.
Tourism Expansion and Economic Development: Var/Vecm Analysis and Forecasts for the Case of India
Andreas G. Georgantopoulos
Asian Economic and Financial Review , 2013,
Abstract: This study tests for the existence and direction of causality between output growth and tourism expenditure using a trivariate model with real effective exchange rate (REER), analysed as a whole and in sub-categories (i.e. leisure travel and tourism expenditures, LTS and business travel and tourism expenditures, BTS) during the period 1988-2011 for India. For this purpose exhaustive empirical evidence are provided from the application of Phillips-Perron and KPSS unit root tests, Johansen cointegration tests, VAR models with an error-correction term, impulse responses, variance decompositions and forecasts generated from the VAR/VECM models. Results for the aggregated model indicate that all variables return to their long-run equilibrium relationships although this model failed to support the significance of causal links between total tourism expenditure and India’s real output. However, the application of the disaggregated model imply strong bidirectional causal links between growth and LTS in the long-run and unidirectional causal links from LTS and BTS to growth suggesting direct impact of tourism on the Indian real output. Finally, forecasts generated for the period 2012-2016 are promising; total tourism expenditure compared to the previous half-decade will grow at a similar pace and optimistic forecasts are generated for the case of LTS, BTS and GDP.
Targeting of Synthetic Gene Delivery Systems
Sch?tzlein Andreas G.
Journal of Biomedicine and Biotechnology , 2003,
Abstract: Safe, efficient, and specific delivery of therapeutic genes remains an important bottleneck for the development of gene therapy. Synthetic, nonviral systems have a unique pharmaceutical profile with potential advantages for certain applications. Targeting of the synthetic vector improves the specificity of gene medicines through a modulation of the carriers' biodistribution, thus creating a dose differential between healthy tissue and the target site. The biodistribution of current carrier systems is being influenced to a large extent by intrinsic physicochemical characteristics, such as charge and size. Consequently, such nonspecific interactions can interfere with specific targeting, for example, by ligands. Therefore, a carrier complex should ideally be inert, that is, free from intrinsic properties that would bias its distribution away from the target site. Strategies such as coating of DNA carrier complexes with hydrophilic polymers have been used to mask some of these intrinsic targeting effects and avoid nonspecific interactions. Preexisting endogenous ligand-receptor interactions have frequently been used for targeting to certain cell types or tumours. Recently exogenous ligands have been derived from microorganisms or, like antibodies or phage-derived peptides, developed de novo. In animal models, such synthetic vectors have targeted remote sites such as a tumour. Furthermore, the therapeutic proof of the concept has been demonstrated for fitting combinations of synthetic vectors and therapeutic gene.
Three-Branes and Five-Branes in N=1 Dual String Pairs
B. Andreas,G. Curio
Physics , 1997, DOI: 10.1016/S0370-2693(97)01342-7
Abstract: In this note we show that in dual N=1 string vacua provided by the heterotic string on an elliptic Calabi-Yau together with a vector bundle respectively F-theory on Calabi-Yau fourfold the number of heterotic fivebranes necessary for anomaly cancellation matches the number of F-theory threebranes necessary for tadpole cancellation. This extends to the general case the work of Friedman, Morgan and Witten, who treated the case of embedding a heterotic $E_8\times E_8$ bundle, leaving no unbroken gauge group, where one has a smooth Weierstrass model on the F-theory side.
The Gibbs paradox, Black hole entropy and the thermodynamics of isolated horizons
Andreas G. A. Pithis
Physics , 2012, DOI: 10.1103/PhysRevD.87.084061
Abstract: This letter presents a new, solely thermodynamical argument for considering the states of the quantum isolated horizon of a black hole as distinguishable. We claim that only if the states are distinguishable, the thermodynamic entropy is an extensive quantity and can be well-de?ned. To show this, we make a comparison with a classical ideal gas system whose statistical description makes only sense if an additional 1/N!-factor is included in the state counting in order to cure the Gibbs paradox. The case of the statistical description of a quantum isolated horizon is elaborated, to make the claim evident.
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