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Počet nalezených dokumentů:
137
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Influence of Plastic Deformation on the Residual Stress Distribution and Fatigue Behaviour of High Strength Steels Welds
Mráz, Ľ.; Karlsson, L.; Hamak, I.; Mikula, Pavol; Vrána, Miroslav
2010 - anglický
The effects of plastic deformation and cyclic loading on residual stress distribution have been studied at welds in high strength 800 MPa steel. Effects of residual stress levels on fatigue life are also presented. Tensile loading was used to induce precisely controlled plastic deformation at weld toes. Residual stress distributions were measured by neutron diffraction. The influence of fatigue loading on the residual stress level was much smaller than that of plastic deformation. A large drop of residual stresses in the vicinity of the welds was recognised after local straining at the level of 2%. Stresses decreased with up to 550 MPa in the region around the weld toe. The effect of local plastic deformation on fatigue properties was also found to be significant. Fatigue strength more than doubled compared to the non-strained as-welded condition.
Klíčová slova:
neutron diffraction; residual stress
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Influence of Plastic Deformation on the Residual Stress Distribution and Fatigue Behaviour of High Strength Steels Welds
The effects of plastic deformation and cyclic loading on residual stress distribution have been studied at welds in high strength 800 MPa steel. Effects of residual stress levels on fatigue life are ...
Geometric Versus Spectral Convergence for the Neumann Laplacian under Exterior Perturbations of the Domain
Arrieta, J. M.; Krejčiřík, David
2010 - anglický
This chapter is concerned with the behavior of the eigenvalues and eigenfunctions of the Laplace operator in bounded domains when the domain undergoes a perturbation. It is well known that if the boundary condition that we are imposing is of Dirichlet type, the kind of perturbations that we may allow in order to obtain the continuity of the spectra is much broader than in the case of a Neumann boundary condition. This is explicitly stated in the pioneer work of Courant and Hilbert [CoHi53], and it has been subsequently clarified in many works, see [BaVy65, Ar97, Da03] and the references therein among others. See also [HeA06] for a general text on different properties of eigenvalues and [HeD05] for a study on the behavior of eigenvalues and in general partial differential equations when the domain is perturbed.
Klíčová slova:
eigenvalues; Laplace operator; Dirichlet condition
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Geometric Versus Spectral Convergence for the Neumann Laplacian under Exterior Perturbations of the Domain
This chapter is concerned with the behavior of the eigenvalues and eigenfunctions of the Laplace operator in bounded domains when the domain undergoes a perturbation. It is well known that if the ...
Photo- and electro-production of kaons
Bydžovský, Petr
2010 - anglický
Isobar models for the electromagnetic production of K+ and K-0 are discussed with emphasis on the K-0 photoproduction off neutron. Predictions of the models for the K-0 photoproduction on deuteron are compared with the recent data and some properties of the elementary amplitudes are shown.
Klíčová slova:
electromagnetic production; photoproduction; model
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Photo- and electro-production of kaons
Isobar models for the electromagnetic production of K+ and K-0 are discussed with emphasis on the K-0 photoproduction off neutron. Predictions of the models for the K-0 photoproduction on deuteron are ...
Integrals of motion for quantum spin chains with elliptic Weierstrass function interaction
Dittrich, Jaroslav; Inozemtsev, V. I.
2009 - anglický
Two non-trivial integrals of motion are constructed for the spin chains with exchange interaction the coupling strengh being given by the Weierstrass elliptic function of the spins distance. Jsou sestrojeny dva netriviální integrály pohybu pro spinové řetězy s výměnnou interkcí, jejíž síla je dána Weierstrassovou eliptickou funkcí vzdálenosti spinů.
Klíčová slova:
spin chain; Weierstrass function; integral of motion
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Integrals of motion for quantum spin chains with elliptic Weierstrass function interaction
Two non-trivial integrals of motion are constructed for the spin chains with exchange interaction the coupling strengh being given by the Weierstrass elliptic function of the spins distance....
Scaling features in high energy hadron and nucleus collisions
Zborovský, Imrich; Tokarev, M. V.
2009 - anglický
Results of analysis of experimental data on inclusive cross sections of jets, direct photons, and high-pT hadrons produced in pp= ¯ pp and AA collisions are presented in the framework of zscaling. The data were obtained at ISR, S¯ppS, RHIC, and Tevatron. New properties of zpresentation of the inclusive spectra are discussed. A physical interpretation of the variable z and the scaling function y(z) is given. A microscopic scenario of hadron and nucleus collisions at a constituent level in terms of momentum fractions is developed. The z-scaling re ects the structure of the colliding objects, interaction of their constituents, and particle formation and manifests the general properties of self-similarity, locality, and fractality. The obtained results could be used for searching for new physics phenomena in high energy hadron and nucleus collisions in soft and hard regions at RHIC, Tevatron, and LHC.
Klíčová slova:
RHIC; LHC
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Scaling features in high energy hadron and nucleus collisions
Results of analysis of experimental data on inclusive cross sections of jets, direct photons, and high-pT hadrons produced in pp= ¯ pp and AA collisions are presented in the framework of zscaling. ...
Effect of ligands on the stability of the specific complex between estrogen receptor (protein) and estrogen response element (DNA) under irradiation
Štísová, Viktorie; Goffinont, S.; Spotheim-Maurizot, M.; Davídková, Marie
2008 - anglický
The overall stability of the specific complex between estrogen receptor protein and DNA estrogen response element under irradiation has been followed. The effect of ligands, estrogen and or tamoxifen, has been determined. Byla sledována celková stabilita specifického komplexu mezi proteinem receptorem estrogenů a DNA estrogen responsivním elementem po ozáření. Byl stanoven vliv ligandů, estrogenu a tamoxifenu.
Klíčová slova:
ionizing radiation; specific DNA-protein complex; estrogen receptor; estrogen response element
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Effect of ligands on the stability of the specific complex between estrogen receptor (protein) and estrogen response element (DNA) under irradiation
The overall stability of the specific complex between estrogen receptor protein and DNA estrogen response element under irradiation has been followed. The effect of ligands, estrogen and or tamoxifen, ...
Effective Scheduling of Data Transfers and Job Allocations
Zerola, Michal
2008 - anglický
Optimalization of some computational tasks in high-energy and nuclear physics. Optimalizace některých výpočetních úkolů ve fyzice vysokých energií a jaderné fyzice.
Klíčová slova:
data transfer; job allocation; high energy physics
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Effective Scheduling of Data Transfers and Job Allocations
Optimalization of some computational tasks in high-energy and nuclear physics.
Optimalizace některých výpočetních úkolů ve fyzice vysokých energií a jaderné fyzice.
High-energy asymptotics of the spectrum of a rectangular periodic network
Turek, Ondřej
2008 - anglický
Spectral properties of an infinite rectangular quantum graph with singular interaction at the vertices. Spektrální vlastnosti nekonečného pravoúhlého kvantového grafu se singulárnímin interakcemi ve vrcholech.
Klíčová slova:
singular coupling; quantum graph; spectrum
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
High-energy asymptotics of the spectrum of a rectangular periodic network
Spectral properties of an infinite rectangular quantum graph with singular interaction at the vertices....
Further achievements in space- and aircraft exposure studies and related topics
Spurný, František
2007 - anglický
Contribution presents new achievements and tendencies concerning the onboard aircraft and spacecraft dosimetry. Příspěvek prezentuje nové úspěchy a tendence v dosimetrii na palubách letadel a kosmické lodi.
Klíčová slova:
aircraft crew dosimetry; cosmic radiation; spectrodosimeter
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Further achievements in space- and aircraft exposure studies and related topics
Contribution presents new achievements and tendencies concerning the onboard aircraft and spacecraft dosimetry....
Bayesian approach for determination of energy response of some radiation detectors to neutrons
Cabal, Arango Gonzalo Alfonso; Spurný, František; Turek, Karel
2007 - anglický
Results of any experimental study, dosimetry ones included, are obtained within limits of some uncertainties. The use of them should be therfore accompanied by the analysis of how these uncertainties can influence the validity of the results. One of the latest approaches how to perform such analysis is known as the Bayesian approach. Výsledky několika experimentálních studií, včetně dosimetrických, jsou získávány v rámci limitů některých nejistot. Jejich použití by mělo proto být doprovázeno analýzami jak mohou tyto nejistoty ovlivnit platnost výsledků.
Klíčová slova:
Bayesian approach; radiation detectors; neutrons
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Bayesian approach for determination of energy response of some radiation detectors to neutrons
Results of any experimental study, dosimetry ones included, are obtained within limits of some uncertainties. The use of them should be therfore accompanied by the analysis of how these uncertainties ...
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