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Search Results: 1 - 10 of 193040 matches for " G. Stephan "
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Successful Search for Ether Drift in a Modified Michelson-Morley Experiment Using the GPS
Stephan J. G. Gift
Applied Physics Research , 2012, DOI: 10.5539/apr.v4n1p185
Abstract: Ether drift resulting from the rotation of the Earth has been detected. This was accomplished using GPS technology in a modified Michelson-Morley experiment. The original Michelson-Morley experiment searched for ether drift by observing round-trip light travel time differences using interference fringe shifts. This method is limited by length contraction effects that significantly reduce any fringe shifts. In the modified approach elapsed time for one-way light transmission is directly determined using GPS clocks. The method yields travel time differences for light transmission in the East-West direction but not in the North-South direction consistent with rotationally-induced ether drift.
One-Way Light Speed Determination Using the Range Measurement Equation of the GPS
Stephan J. G. Gift
Applied Physics Research , 2011, DOI: 10.5539/apr.v3n1p110
Abstract: The one-way speed of light is determined using the range measurement equation of the Global Positioning System. This equation has been rigorously and extensively tested and verified in the Earth-Centred Inertial frame, a frame that moves with the Earth as it revolves around the Sun but does not share its rotation. The result is a simple demonstration of one-way light speed anisotropy depending on the direction of propagation relative to the rotating Earth.
One-Way Speed of Light Relative to a Moving Observer
Stephan J. G. Gift
Applied Physics Research , 2013, DOI: 10.5539/apr.v5n1p135
Abstract: The one-way speed of light relative to a moving observer is determined using the range equation of the Global Positioning System. This equation has been rigorously tested and verified in the Earth-Centred Inertial frame where light signals propagate in straight lines at constant speed c. The result is a simple demonstration of light speed anisotropy that is consistent with light speed anisotropy detected in other experiments and inconsistent with the principle of light speed constancy. This light speed anisotropy was not observed before because there has been no direct one-way measurement of light speed relative to a moving observer.
Heavy Quark Physics on the Lattice
Stephan Güsken
Physics , 1996,
Abstract: We illustrate the current status of heavy quark physics on the lattice. Special emphasis is paid to the question of systematic uncertainties and to the connection of lattice computations to continuum physics. Latest results are presented and discussed with respect to the progress in methods, statistical accuracy and reliability.
Light Speed Invariance is a Remarkable Illusion
Stephan J. G. Gift
Physics , 2007,
Abstract: Though many experiments appear to have confirmed the light speed invariance postulate of special relativity theory, this postulate is actually unverified. This paper resolves this issue by first showing the manner in which an illusion of light speed invariance occurs in two-way light speed measurement in the framework of a semi-classical absolute space theory. It then demonstrates a measurable variation of the one-way speed of light, which directly invalidates the invariance postulate and confirms the existence of the preferred reference frame of the absolute space theory.
Advances in the identification and analysis of allele-specific expression
Christopher G Bell, Stephan Beck
Genome Medicine , 2009, DOI: 10.1186/gm56
Abstract: The interrelationship between the haploid fractions of diploid (or polyploid) genomes and how they control a coordinated regulation of gene expression is still poorly understood. This is despite the fact that the contribution of expression variation to phenotypic diversity, adaptive evolution and disease susceptibility is well recognized [1]. It has been challenging, however, to identify the underlying mechanisms. For instance, only a small minority of single nucleotide polymorphisms (SNPs) identified from the recent plethora of genome-wide disease association studies involved protein-coding sequence changes. Most of the disease-associated SNPs were found within non-coding intronic or intergenic regions from where they are thought to operate on gene expression through cis-acting mechanisms [2].Here, we will only consider diploidy, which is the situation found in all nucleated, somatic cells in humans, giving rise to five possible expression states for each set of alleles (Table 1). Expression states 1 and 2 refer to the situations where expression is either 'on' or 'off' for both alleles and, therefore, do not result in allele-specific expression (ASE).Expression states 3 and 4 refer to the extreme ends of the ASE spectrum, leading to monoallelic expression caused by different mechanisms. The first of these is autosomal imprinting: this is a parent-of-origin specific action, where either the paternal or maternal allele has complete expression output, either within the entire body, specific tissue/cell types, specific developmental stages or only for a particular isoform [3]. Computational prediction suggests that our current knowledge of imprinted genes is an underestimate [4]. A second mechanism is X-inactivation, the random assignment and maintenance of a clonal lineage, whereby functional hemizygosity of the homogametic female genome is invoked for dosage critical genes on one X chromosome [5]. The third is an as yet unknown mechanism, resulting in wide-spread mo
Artemether–lumefantrine in the treatment of uncomplicated Plasmodium falciparum malaria
Stephan Ehrhardt, Christian G Meyer
Therapeutics and Clinical Risk Management , 2009, DOI: http://dx.doi.org/10.2147/TCRM.S5375
Abstract: rtemether–lumefantrine in the treatment of uncomplicated Plasmodium falciparum malaria Review (4738) Total Article Views Authors: Stephan Ehrhardt, Christian G Meyer Published Date October 2009 Volume 2009:5 Pages 805 - 815 DOI: http://dx.doi.org/10.2147/TCRM.S5375 Stephan Ehrhardt, Christian G Meyer Bernhard Nocht Institute for Tropical Medicine, Tropical Medicine Section, Hamburg, Germany Abstract: The World Health Organization strongly recommends artemisinin-based combination therapy (ACT) regimens for the treatment of uncomplicated Plasmodium falciparum malaria cases in endemic areas. Among the combinations of compounds that are available at present, excellent results have been obtained for the artemisinin derivative artemether, in a combination galenic preparation with lumefantrine (artemether–lumefantrine, AL). Here, the pharmacological properties and the therapeutic options of both substances are briefly reviewed and a cursory overview is given on recent trials that have compared the therapeutic effects of AL in the standard 6-dose regimen with other antimalarials and combinations. In order to ensure the most achievable and reliable adherence and compliance of children in the treatment of malaria, a dispersible formulation of AL is now attainable. Recent reports on the emergence of resistance to ACT regimens in Asia, however, are alarming.
Artemether–lumefantrine in the treatment of uncomplicated Plasmodium falciparum malaria
Stephan Ehrhardt,Christian G Meyer
Therapeutics and Clinical Risk Management , 2009,
Abstract: Stephan Ehrhardt, Christian G MeyerBernhard Nocht Institute for Tropical Medicine, Tropical Medicine Section, Hamburg, GermanyAbstract: The World Health Organization strongly recommends artemisinin-based combination therapy (ACT) regimens for the treatment of uncomplicated Plasmodium falciparum malaria cases in endemic areas. Among the combinations of compounds that are available at present, excellent results have been obtained for the artemisinin derivative artemether, in a combination galenic preparation with lumefantrine (artemether–lumefantrine, AL). Here, the pharmacological properties and the therapeutic options of both substances are briefly reviewed and a cursory overview is given on recent trials that have compared the therapeutic effects of AL in the standard 6-dose regimen with other antimalarials and combinations. In order to ensure the most achievable and reliable adherence and compliance of children in the treatment of malaria, a dispersible formulation of AL is now attainable. Recent reports on the emergence of resistance to ACT regimens in Asia, however, are alarming.Keywords: artemether, lumefantrine, malaria, Plasmodium falciparum, dispersible formulation, treatment, therapy
Light Hybrid Mesons in QCD
K. G. Chetyrkin,Stephan Narison
Physics , 2000, DOI: 10.1016/S0370-2693(00)00621-3
Abstract: Including the radiative perturbative corrections and the short distance tachyonic gluon mass effects which mimic the ones of UV renormalons, we re-estimate the decay amplitudes, masses and widths of light hybrid mesons from QCD spectral sum rules. We show that the effects are tiny and confirm the previous lowest order results. We discuss the phenomenological impacts of our results for the vector hybrids.
Comments on the report "Indications of anomalous heat energy production in a reactor device containing hydrogen loaded nickel powder" [arXiv:1305.3913] by G.Levi, E.Foschi, T.Hartman, B.H?istad, R.Pettersson, L.Tegnér, H.Essén
G?ran Ericsson,Stephan Pomp
Physics , 2013,
Abstract: In a recent report titled "Indications of anomalous heat energy production in a reactor device containing hydrogen loaded nickel powder" and published on arXiv, G. Levi and co-workers put forth several claims concerning the operations and performance of the so-called E-Cat of inventor Andrea Rossi. We note first of all that the circumstances and people involved in the test make it far from being an independent one. We examine the claims put forth by the authors and note that in many cases they are not supported by the facts given in the report. We present results from thermal calculations showing that alternative explanations are possible were the authors seem to jump to conclusions fitting pre-conceived ideas. In general we find that much attention is drawn to trivialities, while important pieces of information and investigation are lacking and seem not to have been conducted or considered. We also note that the proposed claims would require new physics in not only one but several areas. Besides a cold-fusion like process without production of any radiation also extreme new material properties would be needed to explain what rather seems to be a problem of correct measurement. Therefore, it is clear to us that a truly independent and scientific investigation of the so called E-Cat device, convincingly demonstrating an "anomalous heat energy production" has not been presented in the arXiv report and is thus, to-date, still lacking.
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