National Repository of Grey Literature 517 records found  beginprevious422 - 431nextend  jump to record: Search took 0.01 seconds. 
Porovnání modelů relativistické čáry železa
Svoboda, Jiří ; Dovčiak, Michal ; Goosmann, René ; Karas, Vladimír
The analysis of the broad iron line profile in the X-ray spectra of active galactic nuclei and black hole X-ray binaries allows us to constrain the spin parameter of the black hole. We compare the constraints on the spin value for two X-ray sources, MCG-6-30-15 and GX 339-4, with a broad iron line using present relativistic line models in XSPEC - LAOR and KYRLINE.
An influence of normal static prestress on fatigue life construction by torsional random loading
Fröhlich, Vladislav ; Balda, Miroslav ; Svoboda, Jaroslav
Definition influence static prestress on fatigue life for case that uniaxial harmonic loading is in literature enough noted and isn't problem influence those components to the calculation of life constructional whole include. Complicated is it in the event of multiaxial loading of different character and especially in cases, when has this loading random character. In the workplace CDM in Pilsen we are already on basis results for Skoda Power Inc . implementation few experiments on piped figure with opening, loading combination normal and torsional load, during which time one of the applied load was election constant and second are harmonic with zero mean value dynamically impact. Along competitive examinations we watcht place of rice cracks.
Janova zátoka. Contribution to structure of the Mesolithic settlement on the Křinice river and the Bohemian road
Svoboda, Jiří
Overview of new rockshelter sites and radiocarbon datings that complete the previous ideas on the Bohemian Switzerland Mesolithic. In addition, there is a discussion of Mesolithic lifestyles (hunting, fishing – namely of salmons, diversification of the settlement structure along the two main rivers, Kamenice and Křinice).
Layered metal phosphonates and their intercalates – interesting inorganic-organic materials
Svoboda, Jan ; Zima, Vítězslav ; Melánová, Klára ; Beneš, L.
Metal phosphonates and their intercalates with amines, alcohols, aminoalcohols and diols were prepared and studied.
Organofosfonáty kovů a jejich interkalační sloučeniny jako anorganicko-organické hybridní materiály a nanomateriály
Zima, Vítězslav ; Svoboda, Jan ; Melánová, Klára ; Beneš, L.
We prepared several new phenylphosphonates and 4-carboxyphenylphosphonates of alkaline earth metals and copper and characterized them by powder X-ray diffraction, thermogravimetric analysis, energy-dispersive X-ray analysis, elemental analysis and infrared spectroscopy. For four of these compounds, their structure was determined from their powder X-ray diffraction patterns using an ab initio FOX program. The prepared alkaline-earth phenylphosphonates with general formula MeC6H5PO3yH2O (Me = Ca, Sr, Ba) were found to be suitable hosts for intercalation reactions.
Properties of thermo-visco-elastic material 42-809 for vibro-damping segment production - 3.part
Svoboda, J. ; Pešek, Luděk ; Frölich, V. ; Klášterka, Petr
The mechanical properties of rubber elements made of thermo-visco-elastic material 42 -809 at low temperatures are summarized in the report. The tests were performed in a climate chamber bought by company INOVA Prague. The chamber was built in a fatigue machine INSTRON 8502 and the temperature range is from -50 up to 180 C. For improvement of a measurement accuracy and loading the force cell with a range up to 40kN was installed. The original sample fixtures of the machine were substituted by two rods ending by supporting plate. The rods went through the bottom and top lids of the chamber. The results of static and dynamic characteristics for temperature from -50 to 0 C, measurement of residual deformation and relaxation time, evaluation of a cyclic loading influence on static characteristics and life-time characteristics for lower temperature are herein presented.
Properties of thermo-visco-elastic material 42-809 for manufacturing of vibrodamping elements – 3.part
Svoboda, Jaroslav ; Pešek, Luděk ; Frölich, V. ; Klášterka, Petr
In the report the results of rubber elements properties made of thermo-visco-elastic material 42-809 at low temperatures are summariesed. The tests were performed by a loading fatigue machine INSTRON 8502 in a climate chamber. For improving an accuracy of measurement the test machine was equipped with a lesser force transduser Rumburk with a range up to 40kN. The report includes results of static and dynamic characteristics in temperature range 0 ÷ -50°C, measurement of residual deformations, relaxation time and evaluation of a cyclic loading influence to shapes of static characteristics of the rubber. Furthermore the results of rubber element life time and evaluation of friction behaviour at lower temperatures are presented. The limit lines for 10% of residual deformations are drawn here, too.
Okrouhlík. Excavation of Mesolithic settlement area in the Kamenice river canyon
Svoboda, Jiří ; Hajnalová, M. ; Horáček, I. ; Novák, Martin ; Přichystal, A. ; Šajnerová, A.
This paper introduces a group of newly discovered Mesolithic rockshelter sites, clustered at the confluence of two rocky canyons in the sandstone region of North Bohemia, Czech Republic (Dolský Mlýn, Šamanská rokle, Prasečí převis, Ferdinandova soutěska, Kostelní rokle). The Okrouhlík rockshelter, representative of the Early Mesolithic stage, was excavated almost completely, demonstrating internal within-site patterning: a central hearth, system of surrounding kettle-shaped pits, and two large, stone-filled, marginally located hearths. Analyses of the environmental data, fauna, and raw material, typological and use-wear analyses of lithic artifacts are included.
Stanovení únavové životnosti při působení hlavních napětí
Balda, Miroslav ; Svoboda, Jaroslav ; Fröhlich, Vladislav
Structures, in general, are exposed to random excitations, which generate normal and torsional stresses. While an estimation of fatigue life is rather well known for uniaxial stress, quite different situation holds for combined random stress. A new approach to the title problem is described lower. It is based on cumulation of stress energy density in peaks of a complex damaging stress.
Database of experimental data fatigue tests part no.1
Fröhlich, Vladislav ; Balda, Miroslav ; Svoboda, Jaroslav
Development report includes database measured experimental data. Procedure for conversion measured data and method lodgment data in database and their using.

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