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Search Results: 1 - 10 of 326387 matches for " S. Roth "
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W Mass at LEP and Standard Model Fits
S. Roth
Physics , 2006,
Abstract: The W-mass measurements from LEP and the results of a global fit of the Standard Model parameters to the electroweak data are presented. Comprehensive studies of experimental systematic effects allowed a measurement of the W mass with an accuracy of better than half a permill. Especially the recent improvements in the LEP energy calibration, the modelling of the hadronisation process and the understanding of Bose-Einstein correlations and colour reconnection effects are discussed. The fit of the Standard Model parameters to all electroweak measurements verifies the self-consistency of the theory. The combination of all electroweak data yield information on the mass of the still undiscovered Higgs boson, $m_H$.
Binary hard-sphere fluids near a hard wall
R. Roth,S. Dietrich
Physics , 2000, DOI: 10.1103/PhysRevE.62.6926
Abstract: By using the Rosenfeld density functional we determine the number density profiles of both components of binary hard-sphere fluids close to a planar hard wall as well as the corresponding excess coverage and surface tension. The comparison with published simulation data demonstrates that the Rosenfeld functional, both its original version and sophistications thereof, is superior to previous approaches and exhibits the same excellent accuracy as known from studies of the corresponding one-component system.
Topological defect formation from 2PI effective action techniques
J. Berges,S. Roth
Physics , 2010, DOI: 10.1016/j.nuclphysb.2011.01.024
Abstract: We propose a quantum approach to nonequilibrium dynamics which combines the successful aspects of classical-statistical simulations on a lattice with the ability to take into account quantum corrections. It is based on the 2PI effective action for inhomogeneous fields and a volume average. This procedure does not involve any double counting which could appear in sampling prescriptions for inhomogeneous quantum evolutions. As an example, we study nonequilibrium dynamics of defect formation in 1+1 dimensional relativistic scalar field theory and compare to insufficient descriptions based on homogeneous quantum fields. The latter are analyzed in detail by coupling the field to an external source, such that the emerging influence of defects can be studied by lowering the source to zero.
Tumornachsorge beim Prostatakarzinom: Die EAU-Guidelines als Grundlage für eine sinnvolle onkologische Nachsorge
Brandt AS,Lazica DA,Roth S
Blickpunkt der Mann , 2008,
Abstract: Das Prostatakarzinom hat als weltweit dritth ufigstes Malignom des Mannes einen besonderen Stellenwert. Aufgrund der m glichen frühen Diagnosestellung und des frühen Therapiebeginns gewinnt auch die Tumornachsorge eine immer gr ere Bedeutung. Eine Tumornachsorge dient dabei sowohl der Entdeckung eines m glichen Rezidives als auch zur Entdeckung und Behandlung von tumor- und therapieassoziierten Komplikationen. Grunds tzlich sollte dabei die Tumornachsorge nach kurativen Therapieans tzen von der Tumornachsorge bei Hormonbehandlung unterschieden werden. Mit der PSA-Wertbestimmung und der digital-rektalen Untersuchung stehen einfache M glichkeiten der Tumornachsorge zur Verfügung. Diese müssen individuell durch verschiedene Zusatzuntersuchungen erg nzt werden. Die EAU-Guidelines bieten eine generell akzeptierte Behandlungs- und Nachsorgeempfehlung und Tumornachsorge beim Prostatakarzinom: Die EAU-Guidelines als Grundlage für eine sinnvolle onkologische Nachsorge k nnen als Hilfestellung bezüglich des Nachsorgezeitpunktes und der zu w hlenden Untersuchungen in der t glichen Praxis dienen. Weitere Studienergebnisse bezüglich der Früherkennung des Prostatakarzinoms verbunden mit einem m glichen überlebensvorteil der Patienten, die Forschung über die PSA-Kinetik und ein besseres Verst ndnis der Risikogruppen für ein Rezidiv k nnen in den n chsten Jahren auch Einfluss auf die Tumornachsorge gewinnen.
The Schrödinger Equation of the Hilbert Hyper Space  [PDF]
Yehuda Roth
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.42023

Quantum measurement requires an observer to prepare a specific macroscopic measuring device from various options. In previous papers we redefined this observer role through a new concept: the observer determination, that is, the observers unique selection between the various measurement-devices. Unlike the measurement itself that is rationalized as dictated by nature, we presented the observer determination as a selection that cannot be disputed since it can neither be measured nor proven to be true or false. In general, we suggest that every action or decision made by the observer is eventually an output of some measurement. The apparently contradiction between the observer free determination and the deterministic measurement output was solved by extending the Hilbert space into a Hyper Hilbert space that is a space with hierarchy. In that frame the so called free selection of the observer determination in a certain level turns out to be a deterministic measurement output in the next higher level of the hierarchy. An important role of the conventional Hilbert space is played by the Schr?dinger equation. It determines a basis of stationary states. In this paper we define the Schr?dinger equation that corresponds with the various levels and we show that each level can be characterized by a unique time scale. We also show how various levels can be synchronized. We believe that this hyperspace level represents a certain level in the physics of consciousness and therefore a level unique time scale can contribute to the time perception of the mind.

Bifurcation and Pattern Recognition  [PDF]
Yehuda Roth
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.41005
Abstract: We propose a new approach in dealing with image recognition. We suggest that recognizing an image is related to the knowledge of a pure quantum state. Since most images are screened through incoherent photons, we introduce a method base on non-linear mapping iterations to regenerate coherence between the image photons.
Single Measurement of Figures  [PDF]
Yehuda Roth
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.46111

We introduce a new approach in dealing with pattern recognition issue. Recognizing a pattern is definitely not the exploration of a new discovery but rather the search for already known patterns. In reading for example the same text written in a hand writing, letters can appear in different shapes. Still, the text decoding corresponds with interpreting the large variety of hand writings shapes with fonts. Quantum mechanics also offer a kind of interpretation tool. Although, with the superposition principle it is possible to compose an infinite number of states, yet, an observer by conducting a measurement reduces the number of observed states into the predetermined basis states. Not only that any state collapses into one of the basis states, quantum mechanics also possesses a kind of correction mechanism in a sense that if the measured state is close enough to one of the basis states, it will collapse with high probability into this predetermined state. Thus, we can consider the collapse mechanism as a reliable way for the observer to interpret reality into his frame of concepts. Both interpretation ideas, pattern recognition and quantum measurement are integrated in this paper to formulate a quantum pattern recognition measuring procedure.

Rapid Quantum Search Algorithm  [PDF]
Yehuda Roth
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.49158

The collapse phenomenon, the parallelism principle and states correlation are used to define a type of a Grover rapid search engine. In our approach, the observer’s query and the Grover-unsorted-data are stored in different memories where the global state is represented by a tensor product of the associated states. In the proposed formalism, each query-state input activates an adjusted operator that implements the unsorted state in an appropriate 2-D Grover representation. It will be shown that once the representation is set, it takes mainly two operations to complete the whole query search. This seems to be a very efficient search algorithm.

Homeostasis Processes Expressed as Flashes in a Poincaré Sections  [PDF]
Yehuda Roth
Journal of Modern Physics (JMP) , 2018, DOI: 10.4236/jmp.2018.912134
Abstract: We describe a homeostasis system with a discrete map that is revealed by stroboscopic “flashes” (Poincaré sections) that are synchronized with the measurement events.
Functional design method for improving safety and ergonomics of mechanical products  [PDF]
Aurélie Robert, Sébastien Roth, Dominique Chamoret, Xiu Tian Yan, Francois Peyraut, Samuel Gomes
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.58058
Abstract: In order to help companies to improve their competetiveness, it is important to develop new design methodologies. In this framework, a Functional And Robust Design (FARD) methodology dedicated to routine design of “highly productive” modular product ranges is proposed including principles of functional analysis, Design For Assembly (DFA), and techniques of modelling and simulation for ergonomics consideration. This paper focuses on the application of this original method applied to mechanical vibration and ergonomics problems of a scraper. Including biomechanical aspect in the design methodology, it is possible to identify the impact of a vibration tool on its users using numerical models of the tool coupled to a finite element model of the human hand. This method can proactively warn very early, in the design process, the risks of causing musculoskeletal disorders and facilitate an optimization of the mechanical tool. This study is a first step in a context of human-centered design.
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