Wyniki wyszukiwania - BazTech

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Opracowanie konstrukcji i technologii obróbki innowacyjnej zasuwy energetycznej

Stanisław Adamczak, Miko Edward, Makieła Włodzimierz, Nowakowski Łukasz, Skrzyniarz Michał, Jarema Marek, Świderski Jacek, Dobrowolski Tomasz, Wójcik Czesław

Mechanik

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2020

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R. 93, nr 12

6--10

EN

The article presents the results of the research project in cooperation between Kielce University of Technology and Chemar Armatura Sp. z o.o. Project co-financed by european funds was entitled: “Putting into the production of an innovative series of energy wedge gate which is equipped with two-part wedge and swing disk, as a result of R&D works at Chemar Armatura”.

PL

W artykule przedstawiono wyniki pracy badawczej prowadzonej przez Politechnikę Świętokrzyską w Kielcach oraz Chemar Armatura Sp. z o.o., dofinansowanej z funduszy europejskich w ramach projektu pt. „Wdrożenie do produkcji w firmie Chemar Armatura innowacyjnego typoszeregu zasuw klinowych wyposażonych w klin dwudzielny z przesuwanymi dyskami wahliwymi, jako wynik zleconych prac B+R”.

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Amelioration of Ultrasonic Transducer to Study CuO Doped Thin Films

Barakat M. A. Y.

Archives of Acoustics

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2018

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Vol. 43, No. 3

487--495

EN

Ultrasonic pulse echo technique was used to study cupric oxide (CuO) thin films. CuO thin films were prepared using sol gel technique. They were doped with Lithium (Li) (1%, 2% and 4%). Thin films’ thickness (d) and band gap energy (Eg) were measured. In addition, elastic moduli (longitudinal (L), shear (G), bulk (K) and Young’s (E)) and Poisson’s ratio (v) were determined to estimate the microstructure properties of the prepared films. The study ameliorated the used transducers to overcome their dead zone and beam scattering; wedges were developed. The results showed the effectiveness of these wedges. They enhanced transducers’ sensitivity by changing the dead zone, beam diameter, beam directivity and waves’ transmission. Also, the study noted that Li doping caused the improvement of CuO thin films to be more useful in solar cell fabrication. Li-CuO thin films had narrower band gap. Thus, they acquired a high quantum yield for the excited carriers; also they gained more efficiency to absorb solar light.

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Slope stability analysis in open pit mines of Jebel Gustar career, NE Algeria – a multi-steps approach

Zahri F., Boukelloul M. L., Hadji R., Talhi K.

Mining Science

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2016

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Vol. 23

137--146

EN

Several types of instabilities can menace the personnel and equipment in the open cast mines. Their kinematicis dependent commonly on the nature, the structure, the fracturing and the strength of the rock mass. A scientific assessment vis-a-vis their equilibrium is suggested. For this task a considerable amount of field work must already carrying out to supply the necessary data ie: geometric, mechanic and geologic parameters. The main purpose of this research is identifying different modes of slope failures that may develop on the career “ENOF” of Jebel Gustar, by a multi-step analysis. For this task, i) a structural analysis; ii) an estimation of the rock mass and discontinuity mechanical properties, iii) a rating of the rock mass quality, iv) and a numerical simulation of the stability are procedurally used. The results matched well with the field observations. They proved the poor stability of the career, showing a typical example of a bad slope-design. The application of such approaches can help stabilizing the mine and ensure the safety and a sustainable production.

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MHD heat transfer to non-Newtonian power-law fluids flowing over a wedge with viscous dissipation

Kishan N., Amrutha P.

International Journal of Applied Mechanics and Engineering

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2009

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Vol. 14, no 4

965-987

EN

Fluid flow and heat transfer of a power law fluid flowing over a wedge, taking into consideration viscous dissipation, in the presence of a magnetic field is investigated. The governing partial differential equations are reduced to ordinary differential equations by the application of group theory. By using quasi-linearization technique, first we linearized the coupled non-linear equations are first linearized, and then solved them numerically by a finite difference method. Numerical solutions for the governing momentum and energy equations are obtained. Results are presented as velocity profiles and temperature profiles for different flow parameters, such as, the magnetic field parameter M, Prandtl number Pr, Eckert number Ec, the flow behavior index n, and the wedge angle parameter m. Variations of heat transfer and skin friction for different values of Ec, Pr, M and m are presented. Heat transfer and skin friction results are compared for various values of the flow behaviour index n governing the nature of the fluid and also for different wedge angles.

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Zagadnienia antypłaskie dla układu klinów z promieniowymi defektami

Sulym H., Machorkin M.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Nauki Techniczne

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2007

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Z. 4

120-122

PL

W pracy przedstawiono analizę antypłaskiego zagadnienia dla wieloklinowego układu, w którym promieniowo rozmieszczone są cienkie defekty w postaci szczelin lub doskonale sztywnych inkluzji. Z wykorzystaniem aparatu funkcji uogólnionych zaproponowano metoda rozwiązywania takiego zagadnienia w przypadku dowolnej ilości klinów i dowolnych warunków brzegowych na krawędziach pakietu. Wprowadzono pojęcie uogólnionego współczynnika intensywności naprężeń w wierzchołku klina. Dla przykładu układu złożonego z dwóch klinów ze szczeliną, obciążoną siłą skupioną, otrzymano układ równań całkowych osobliwych, który w przypadku szczeliny na linii połączenia dwóch klinów o jednakowych kątach wierzchołkowych daje ścisłe rozwiązanie analityczne.

EN

We have considered a problem on antiplane strain of a multi-wedge system with radially distributed thin defects in the form of cracks or absolutely rigid inclusions. Exploiting the apparatus of generalized functions the method for solution of this problem for arbitrary number of wedges and arbitrary boundary conditions on the packet faces has been proposed. The notion of generalized stress intensity factor in the wedge point has been introduced. As an example the singular integral equations for a two-wedge system with a crack loaded by a concentred force have been constructed. The accurate solution has been constructed for the case of a crack on the coupling line of two wedges with similar opening.

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Badania filmowe bryły glebowej odkształcanej przez wąskie narzędzie uprawowe

Piotrowska E.

Inżynieria Rolnicza

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2003

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R. 7, nr 11

173--178

PL

Rozważano geometrią bryły glebowej odkształcanej przez wąskie narzędzie uprawowe. Odkształcana bryła glebowa została podzielona na cztery strefy: centralną, dwie boczne i dolną, poniżej głębokości krytycznej, odkształcaną jedynie w płaszczyźnie poziomej. Przeprowadzono badania filmowe bryły glebowej, po przez filmowanie przebiegu odkształcenia z góry i z boku poprzez szybę wmontowaną w boczną ścianą kanału glebowego. Badania filmowe potwierdziły jednoznacznie prawdziwość założenia o istnieniu głębokości krytycznej oraz umożliwiły zadowalającą weryfikację parametrów bryły glebowej otrzymanych z modelu.

EN

The geometry of soil wedge deformed by a narrow tine was taking into consideration. The failure soil wedge is divided into four sections: centre, two sides and horizontal two-dimensional below the critical depth. Mathematical model based on this geometry was verified in a soil bin. Both the side and surface wedge formations were examined with a camera. The results of this experiments showed that geometry of soil wedge has been corrected, especially confirmed existence of critical depth.

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Convective micropolar boundary layer flows over a wedge with constant surface heat flux

Kim Y. J., Kim T. A.

International Journal of Applied Mechanics and Engineering

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2003

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Vol. 8, no spec.

147-153

EN

In this study, the steady laminar boundary layer flow of micropolar fluids over a wedge has been examined with the constant heat flux boundary condition on the wedge surface. The similarity variables found by Falkner and Skan are employed to reduce the streamwise-dependence in the coupled nonlinear boundary layer equations. Numerical solutions are presented for the heat transfer characteristics using the fourth-order Runge-Kutta numerical procedure with shooting method. The micro-rotation velocity and temperature distributions across the boundary layer are plotted with different wedge angles and compared with the corresponding flow problems for a Newtonian fluid.