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Search Results: 1 - 10 of 7495 matches for " Benjamin Glaessle "
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Electromagnetic corrections to pseudoscalar decay constants
Benjamin Glaessle,Gunnar S. Bali
Physics , 2011,
Abstract: The effects of electromagnetic interactions on pseudoscalar decay constants are investigated. Using a compact QED and QCD action we are able to resolve differences of about 0.1 MeV. We obtain the preliminary results f_pi^0-f_pi^+/- =0.09(3) MeV and f_D^0-f_D^+/- =0.79(11) MeV for light and charmed pseudoscalar decay constants on a N_f=2 nonperturbatively improved Sheikholeslami-Wohlert ensemble.
QCD spectroscopy and quark mass renormalisation in external magnetic fields with Wilson fermions
Gunnar Bali,Bastian B. Brandt,Gergely Endrodi,Benjamin Glaessle
Physics , 2015,
Abstract: We study the change of the QCD spectrum of low-lying mesons in the presence of an external magnetic field using Wilson fermions in the quenched approximation. Motivated by qualitative differences observed in the spectra of overlap and Wilson fermions for large magnetic fields, we investigate the dependence of the additive quark mass renormalisation on the magnetic field. We provide evidence that the magnetic field changes the critical quark mass both in the free case and on our quenched ensemble. The associated change of the bare quark mass with the magnetic field affects the spectrum and is relevant for the magnetic field dependence of a number of related quantities. We derive Ward identities for lattice and continuum QCD+QED from which we can extract the current quark masses. We also report on a first test of the tuning of the quark masses with the magnetic field using the current quark masses, and show that this tuning resolves the qualitative discrepancy between the Wilson and overlap spectra.
_{u-d} from lattice QCD at nearly physical quark masses
Gunnar S. Bali,Sara Collins,Mridupawan Deka,Benjamin Glaessle,Meinulf Gockeler,Johannes Najjar,Andrea Nobile,Dirk Pleiter,Andreas Schafer,Andre Sternbeck
Physics , 2012, DOI: 10.1103/PhysRevD.86.054504
Abstract: We determine the second Mellin moment of the isovector quark parton distribution function _{u-d} from lattice QCD with N_f=2 sea quark flavours, employing the non-perturbatively improved Wilson-Sheikholeslami-Wohlert action at a pseudoscalar mass of 157(6) MeV. The result is converted non-perturbatively to the RI'-MOM scheme and then perturbatively to the MSbar scheme at a scale mu = 2 GeV. As the quark mass is reduced we find the lattice prediction to approach the value extracted from experiments.
QPACE 2 and Domain Decomposition on the Intel Xeon Phi
Paul Arts,Jacques Bloch,Peter Georg,Benjamin Glaessle,Simon Heybrock,Yu Komatsubara,Robert Lohmayer,Simon Mages,Bernhard Mendl,Nils Meyer,Alessio Parcianello,Dirk Pleiter,Florian Rappl,Mauro Rossi,Stefan Solbrig,Giampietro Tecchiolli,Tilo Wettig,Gianpaolo Zanier
Physics , 2015,
Abstract: We give an overview of QPACE 2, which is a custom-designed supercomputer based on Intel Xeon Phi processors, developed in a collaboration of Regensburg University and Eurotech. We give some general recommendations for how to write high-performance code for the Xeon Phi and then discuss our implementation of a domain-decomposition-based solver and present a number of benchmarks.
Clinical Profile of the Patients with Newly Detected Left Bundle Branch Block in the Outpatient Department  [PDF]
Bino Benjamin
World Journal of Cardiovascular Diseases (WJCD) , 2018, DOI: 10.4236/wjcd.2018.82014
Abstract: Objective: The purpose of this study was to evaluate cardiac features associated with newly detected left bundle branch block (LBBB) in the outpatient department. Methods: A total of 57 patients with LBBB pattern were evaluated using electrocardiography (ECG). Patients were assessed based on their sex, age, detailed history, and cardiovascular symptoms. Cardiac investigations including ECG and echocardiography were performed. Results:The study included 30 (52.6%) males and 27 (47.5%) females, aged between 35 and 80 years. Dyspnoea (35.1%) and chest pain (22.8%) were the most common symptoms. 54.4% were hypertensive and 17.5% were diabetics. 28% had Left ventricular systolic dysfunction, and 24.5% had aortic valve disease. Left ventricular hypertrophy without any other structural heart disease was present in 28% of the patients. Only 24.5% patients presented with LBBB had a structurally normal heart in echocardiography. Myocardial performance index in echocardiography was abnormal in LBBB irrespective of the presence of structural heart disease. Conclusion: The prevalence of LBBB was found to increase with age and had slight male preponderance. Dyspnoea on effort was the most common presenting complaint, followed by chest pain and incidental detection of ECG abnormality. Most of the patients were hypertensive. Only 24.5% patients with LBBB had a structurally normal heart. MPI was abnormally high in the presence of LBBB despite having a normal left ventricular ejection fraction.
Representative Government in the Era of Improved Communication  [PDF]
Benjamin Barrowes
Open Journal of Political Science (OJPS) , 2019, DOI: 10.4236/ojps.2019.92019
Abstract: Technology is allowing communication to become inexpensive, ubiquitous, secure, and instantaneous, in the process transforming individual lives and societies. Representative government was conceived in an era of laborious, slow, insecure, local, and high-cost communication modalities. These modalities imposed burdensome but inescapable limitations on both the representatives who were entrusted to aggregate and adjudicate public sentiment while making decisions on the behalf of others, as well as the public who faced trust crises, participation barriers, and ignorance of facts and issues. This paper explores positive and negative consequences that improved communication has for representatives. Consequences for a better educated and informed citizenry often with unprecedented discretionary time are also examined. Conclusions include deliberate power divestment on the part of representatives and an open source government model for citizens.
Vulnerabilities of LDAP As An Authentication Service  [PDF]
Charlie Obimbo, Benjamin Ferriman
Journal of Information Security (JIS) , 2011, DOI: 10.4236/jis.2011.24015
Abstract: Lightweight Directory Access Protocol (LDAP) servers are widely used to authenticate users in enterprise level networks. Organizations such as universities and small to medium-sized businesses use LDAP for a variety of applications including e-mail clients, SSH, and workstation authentication. Since many organizations build dependencies on the LDAP service, a Denial-of-Service (DoS) attack to the service can cause a greater number of services disrupted. This paper examines the danger in the use of LDAP for user authentication by executing a DoS attack exploiting the TCP three-way handshake required when initializing a connection to an LDAP server.
Large square baling and bale handling efficiency—A case study  [PDF]
Benjamin Kemmerer, Jude Liu
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.32020
Abstract: Large square baling is currently recognized as a high efficiency biomass harvesting system. Baling, bale collecting, and storing at a commercial wheat straw farm was studied as a typical large square bale harvesting system. Factors that affect large square bale production and handling logistics were quantified. Field operations of a large square baler, two bale handlers, and three bale trucks were observed in a full day field operation. System performance was analyzed and material capacities of all machines used in this system were determined based on field measurements. System limitations were quantified, and means to increase system efficiency or reduce production costs were discussed. Results showed that 340 wheat straw bales at a density of 116 kg·m-3 (wet matter) were made with a single large square baler during 8 h field operations. The number of bales produced was the system limitation when one baler, two bale handlers and three bale trucks were used. Adding a baler or reduce the number of operators can increase system efficiency. The large square baler used in this study had a material capacity of 13 Mg·h-1. Similar baling trials were conducted in a switchgrass field and results indicated that the baler had the same material capacity.
New Evidence, Conditions, Instruments & Experiments for Gravitational Theories  [PDF]
Benjamin T. Solomon
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.48A018
Abstract:

Two significant findings compel a rethink of physical theories. First, using a 7-billion-year-old gamma-ray burst, Nemiroff (2012) showed that quantum foam could not exists. And second, Solomon (2011) showed that gravitational acceleration is not associated with the gravitating mass, that gravitational acceleration g is determined solely by τ the change in time dilation over a specific height multiplied by c2 or g = τc2. Seeking consistency with Special Theory of Relativity, as means to initiate this rethink, this paper examines 12 inconsistencies in physical theories that manifest from empirical data. The purpose of this examination is to identify how gravitational theories need to change or be explored, to eliminate these 12 inconsistencies. It is then proposed that spacetime is much more sophisticated than just a 4-dimensional continuum. And, that the Universe consists of at least two layers or “kenos” (Greek for vacuous), the 4-dimensional kenos, spacetime (x, y, z,

Vertical Heterogeneity of Genotypic Structure and Toxic Potential within Populations of the Harmful Cyanobacterium Microcystis aeruginosa  [PDF]
Benjamin Misson, Delphine Latour
Advances in Microbiology (AiM) , 2013, DOI: 10.4236/aim.2013.36A004
Abstract: We investigated the vertical variability of toxic potential (i.e. proportions of cells containing microcystin genes) and genotypic structure within different populations of Microcystis aeruginosa that developed in deep artificial reservoirs on the Loire River (France). We demonstrated that a great qualitative vertical heterogeneity could exist within a single bloom of this cyanobacterium in deep lakes. Indeed, we observed important vertical shifts of both toxic potential and genotypic structure, whatever the bloom magnitude. These variations occurred mainly within the euphotic zone and proved to occur independently from abundance vertical shifts. One of the most striking results of this study is that the genotypic structure of a population of M. aeruginosa was more variable between different depths sampled at a single site than between different sites of the same reservoir sampled on top of the water column. In the same way the proportion of potentially toxic cells was sometimes more variable vertically than horizontally. The occurrence of such vertical heterogeneity in three different blooms suggests that this could be a frequent pattern within populations of M. aeruginosa.
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