Autor: Stachura, S. - Katalog OPAC zbiorów

Tytuł:: Analysis the dynamic stability of plate
Autorzy:: Misiak, J.
Stachura, S.
Powiązania:: https://bibliotekanauki.pl/articles/244181.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Opis:: In this paper a numerical approach to analyze the dynamic stability of a ribbed plate subjected to harmonic loading is presented. The harmonic balance method and the modified Newmark method of direct integration to solve the equations of motion are used, Unstable regions which include resonant frequencies of the external load are discussed. Then the Stability loss occurs by flutter, i.e. exponentially growing oscillations. The modified Newmark direct integration method to analyze the equations of motion is used. Some results which describe the time history of resonance vibrations (unstable) and those nonresonances (stable) are presented. The effects of constraint parameters such a modulation depth beta and constraint frequency fi are investigated. Also the initial load and internal damping are taken into account. Physical rigidity of plate may be changed by adding initial tension load, and currently resonance vibration will transform to non-resonance. Stability of the system by means of initial load is the more effective, the larger is the system rigidity in the direction of putting the load, as then may be introduced larger value of initial load. Stability of the system by means of initial load is the more effective, the larger is the system rigidity.
Źródło:: Journal of KONES; 2009, 16, 1; 351-356
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Applications of the Cracow X-Ray Microprobe in Tomography
Autorzy:: Bielecki, J.
Bożek, S.
Lekki, J.
Stachura, Z.
Kwiatek, W.
Powiązania:: https://bibliotekanauki.pl/articles/1809463.pdf
Data publikacji:: 2009-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 87.59.-e
87.57.Q-
Opis:: A nuclear microprobe at the IFJ PAN in Cracow has found numerous applications in different fields of research, mostly in biophysics, medical sciences, geology, and material research. In order to extend the research possibilities, a new X-ray microprobe was constructed. This new microprobe consists of three experimental lines dedicated to: (i) X-ray irradiation of biological specimens, (ii) elemental analysis of samples by micro X-ray fluorescence or total reflection X-ray fluorescence methods and (iii) computer microtomography. In this paper the computer microtomography line was described. The line consists of an open type Hamamatsu L9191 X-ray tube with microfocusing to about 2 μm, a high resolution X-ray sensitive CCD camera, and a precise goniometer composed of six piezoelectric motors. Depending on the required X-ray energy, the Hamamatsu tube is used with Ti, Mo, Ag, or W targets. A small focus size and short focus-to-object distance enable to obtain images of samples with a magnification of more than 1000× and resolution of the order of 2 μm. The computer microtomography measurements are carried out using home developed codes combined with commercial software. Details of the microprobe construction and preliminary results of the computer microtomography experiments are presented.
Źródło:: Acta Physica Polonica A; 2009, 115, 2; 537-541
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Atherosclerosis and mitochondrial dysfunction – possible links
Autorzy:: Stachura, M.
Pierzynowski, S.G.
Powiązania:: https://bibliotekanauki.pl/articles/3191.pdf
Data publikacji:: 2009
Wydawca:: Instytut Medycyny Wsi
Źródło:: Journal of Pre-Clinical and Clinical Research; 2009, 03, 2
1898-2395
Pojawia się w:: Journal of Pre-Clinical and Clinical Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Static analysis and stability of the grillage
Autorzy:: Stachura, S.
Powiązania:: https://bibliotekanauki.pl/articles/244425.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Opis:: Steel floor structures for which the grillage is a computational model, are used as carrying systems in building engineering, e.g. in buildings intended for warehouses. The linear and nonlinear static analysis was carried out as well as the verification of grillage sensitivity to the effect of stability loss. Updating of structure geometry description with every step of load increment and updated Lagrange description was applied, and for solution of equilibrium equations the Newton-Raphson method was used with matrix updating with every step of load increment and after each iteration. At dimensioning of the cross-section should be still added conditions connected with internal forces, so-called limit state of load capacity, which requires to fulfill additional conditions, e.g. related to local stability, geometric imperfections, warps and so on, of individual fragments of beam's cross-section, causing increase of rigidity of the grillage and thus carrying away possibility that nonlinear work of the structure occurs under the right conditions of using. Accomplished assessment of the grillage's sensibility to additional compressive loads Fx gives quantitative information relating to their maximum values, so as to fulfil the condition of the limit deflection as well.
Źródło:: Journal of KONES; 2011, 18, 1; 609-614
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Metoda utylizacji odpadów metalurgicznych
Method of metallurgical waste scale-utilization
Autorzy:: Łędzki, A
Sanak-Rydlewska, S.
Tora, B.
Mazurkiewicz, M.
Stachura, R.
Wcisło, Z.
Klimczyk, A
Bernasowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/1819347.pdf
Data publikacji:: 2012
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: zendra powalcownicza
ciecz ciężka
odpady metalurgiczne
Opis:: The project aims to develop technologies for the production of a sinker for heavy media (used in gravity separation of the minerals) on the basis of metallurgical wastes. Research includes the study of physicochemical properties of waste as a sinker, and the development of technology to modify these properties. The technology will be waste-less. Annual requirements of the sinker is approximately 15 thousand tons, and is met by imports. The product, which will result from the realization and implementation of the project will replace the imported raw material. In the years 1980-1985 prof. Tadeusz Piecuch with his team [1-8] conducted research and developed the technology and logistics of implementation of the mill waste sludge from wet cleaning of exhausts from blast furnace in Kosciuszko Ironworks for making a heavy liquid suspension. Industrial test of possibility of implementation of heavy liquid made from waste was carried out in Piast coal mine in Bierun Nowy from 30.08.1984 to 08.09.1984. An attempt is successful [7].
Źródło:: Rocznik Ochrona Środowiska; 2012, Tom 14; 772-789
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Preliminary Investigations of Elemental Content, Microporosity, and Specific Surface Area of Porous Rocks Using PIXE and X-ray Microtomography Techniques
Autorzy:: Bielecki, J.
Bożek, S.
Dutkiewicz, E.
Hajduk, R.
Jarzyna, J.
Lekki, J.
Pieprzyca, T.
Stachura, Z.
Szklarz, Z.
Kwiatek, W.
Powiązania:: https://bibliotekanauki.pl/articles/1490118.pdf
Data publikacji:: 2012-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.70.Tx
91.65.-n
47.56.+r
Opis:: Determination of physical properties of porous geological materials is of great importance for oil industry. The knowledge of rocks properties is usually obtained from porosity studies such as pore size distribution, specific surface area determination, and hydrodynamic permeability calculations. This study describes determination of elemental composition and measurements of the particular physical properties of geological samples (porous sandstone rocks) by means of the nuclear and X-ray microprobes at the Institute of Nuclear Physics, Polish Academy of Sciences in Kraków, Poland. The special emphasis has been put on the computed microtomography method. Measurements have been carried out in close cooperation with Department of Geophysics, FGGEP AGH in Kraków, Poland. Chemical composition of the Rotliegend sandstone rock samples (few millimeters diameter), extracted from a borehole at 2679.6 m, 2741.4 m and 2742.4 m depth have been investigated using the 2.2 MeV proton beam (proton induced X-ray emission technique). Next, measurements of the porosity and the specific surface area of the pore space have been carried out using the X-ray microtomography technique. Basing on microtomographic data obtained with the high spatial resolution, simulations of the fluid dynamic in the void space of porous media have been carried out. Lattice Boltzmann method in the 3DQ19 geometrical model has been used in order to predict the hydraulic permeability of the media. In order to avoid viscosity-permeability dependence the multiple-relaxation-time model with half-way bounce back boundary conditions has been used. Computing power-consuming processing has been performed with the use of modern grid infrastructure.
Źródło:: Acta Physica Polonica A; 2012, 121, 2; 474-479
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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