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Wyświetlanie 1-10 z 211
Tytuł:
Comparative dynamic analysis of the portal cranes of type H and X
Autorzy:
Vasiljević, Rade
Powiązania:
https://bibliotekanauki.pl/articles/1839622.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
portal cranes
type H
type X
Finite Element Method
comparative dynamicanalysis
Opis:
In this paper, a comparative dynamic analysis of the portal cranes of type H and X is described. The difference of the considered cranes arises from the difference of their portals. These two types of portals have the same main geometric measurements. They differ only at the medium level in the horizontal plane. The first type of the portal on the middle level has an H-frame, while the second type has an X-frame. In this paper, dynamic parameters of the two portals have been compared. Estimation has been done to find which of the two types of portals has more favourable dynamic stability for overturn.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 4; 825-839
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tests results of new diagnostic method for WOLA marine diesel engines type H
Autorzy:
Lus, T.
Powiązania:
https://bibliotekanauki.pl/articles/245573.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
maritime transport
combustion engines
diagnostics
Opis:
Results of studies that aim was to develop a diagnostic method for WOLA marine diesel engines type H are presented in this paper. These engines are high-speed type units used to drive small vessels or more often to drive ship generators. Polish Navy is operating significant number engines of this type. Motors of this type do not have indicator valves, which complicates the assessment of their technical condition in exploitation. These engines also, because of their age, are relatively poorly equipped in control and measurement devices. In the era of cost reduction in operation of marine equipment there is also tendency to reduce the cost of maintenance and repair of diesel engines. One way to avoid malfunction of the motor can be systematic monitoring of the technical condition of selected critical systems using reliable diagnostic methods. Polish Naval Academy (PNA) in Gdynia for years has been doing research on methods of diagnosing marine internal combustion engines. In recent years, a diagnostic method for high-speed diesel engines based on the analysis of envelope of vibration accelerations generated by the valve gear mechanism and fuel system of WOLA type H engines has been developed. Preliminary tests were carried out on a six-cylinder WOLA engine type 57H6Aa in the Marine Power Plant Operation Laboratory in PNA. Verification tests were conducted on twelve-cylinders WOLA engines of the same type on navy vessels. The developed method allows determine the angles of opening and closing the fuel injection valves and angles of closing intake and exhaust valves during engine operation. Using this method it could not be clearly determined opening angles of intake and exhaust valves.
Źródło:
Journal of KONES; 2013, 20, 1; 193-200
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
TiAl-based Ohmic Contacts to p-type 4H-SiC
Autorzy:
Martychowiec, Agnieszka
Kwietniewski, Norbert
Kondracka, Kinga
Werbowy, Aleksander
Sochacki, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/1844507.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ohmic contact
SiC
silicon carbide
TiAl
Opis:
This paper describes successfully formed ohmic contacts to p-type 4H-SiC based on titanium-aluminum alloys. Four different metallization structures were examined, varying in aluminum layer thickness (25, 50, 75, 100 nm) and with constant thickness of the titanium layer (50 nm). Structures were annealed within the temperature range of 800°C - 1100°C and then electrically characterized. The best electrical parameters and linear, ohmic character of contacts demonstrated structures with Al layer thickness equal or greater than that of Ti layer and annealed at temperatures of 1000°C or higher.
Źródło:
International Journal of Electronics and Telecommunications; 2021, 67, 3; 459-463
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A multiplier theorem for H-type groups
Autorzy:
Pini, Rita
Powiązania:
https://bibliotekanauki.pl/articles/1293542.pdf
Data publikacji:
1991
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
We prove an $L^p$-boundedness result for a convolution operator with rough kernel supported on a hyperplane of a group of Heisenberg type.
Źródło:
Studia Mathematica; 1991, 100, 1; 39-49
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania mössbauerowskie chondrytów zwyczajnych typu H potwierdzają stopień ich zwietrzenia określony za pomocą skali W
Mössbauer measurements of ordinary chondrites type H confirm their level of weathering determined by scale W
Autorzy:
Jakubowska, Martyna
Rzepecka, Patrycja
Duda, Przemysław
Woźniak, Marek
Gałązka-Friedman, Jolanta
Powiązania:
https://bibliotekanauki.pl/articles/1033083.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Carancas
Gao-Guenie meteorites
Juancheng
Mössbauer spectroscopy
weathering
Opis:
Mössbauer measurements of ordinary chondrites type H performed in room temperature are presented. Three investigated meteorites: Carancas, Juancheng and Gao-Guenie are new falls with different terrestrial history. Results of weathering in different conditions during terrestrial life are well seen in their Mössbauer spectra. The level of weathering determined by scale W is in perfect agreement with Mössbauer measurements of these three ordinary chondrites.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2017, 8; 63-72
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania mössbauerowskie trzech chondrytów zwyczajnych typu H i trzech chondrytów zwyczajnych typu LL – wyznaczanie niepewności powierzchni spektralnych
Mössbauer studies of three ordinary chondrites type H and three ordinary chondrites type LL – uncertainty of the determination of spectral areas
Autorzy:
Jakubowska, Martyna
Buczek, Aleksandra
Gwiździel, Katarzyna
Djellouli, Adam
Nowak, Filip
Woźniak, Marek
Gałązka-Friedman, Jolanta
Karwowski, Łukasz
Duda, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/1032384.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Bassikounou
Buzzard Coulee
Kilabo
Mössbauer spectroscopy
NWA 4841
NWA 6287
Zag
ordinary chondrites
Opis:
Mössbauer 57Fe measurements of three ordinary chondrites type H and of three ordinary chondrites type LL were performed at room temperature. The spectral areas were fitted using the “Recoil” program (Lagarec i in. 1998). Fitting was repeated three times which allowed us to determinate the differences between the results of fits performed by different persons.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2019, 10; 34-39
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hermite-Hadamard type inequalities for h-preinvex mappings via fractional integrals
Autorzy:
Matloka, M.
Powiązania:
https://bibliotekanauki.pl/articles/205901.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Riemann-Liouville integral
Hermite-Hadamard type inequalities
h-preinvex function
Opis:
In this paper, we first establish the Hermite-Hadamard inequalities involving Riemann-Liouville fractional integrals for the h-preinvex function. Then, some Hermite-Hadamard type integraf inequalities for the fractional integrals are obtained.
Źródło:
Control and Cybernetics; 2015, 44, 2; 275-285
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Security management in the H-H type of the organizational structures
Autorzy:
Woźniak, J.
Zaskórski, P.
Powiązania:
https://bibliotekanauki.pl/articles/94845.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
dispersed structure
H-H structure
network
security
ICT
X-engineering
cloud computing
struktura rozproszona
sieć
bezpieczeństwo
Opis:
The article is devoted to the problems of the security management for the dispersed organizational structures. The security is one of the system criteria that determine the factual value of the organization, what tends to expose the information and decision-making processes in an article. These processes determine the efficiency of modern business units and directly affect the level of the overall security of dispersed organizations. The security of an organization can be seen in various aspects ranging from the system security (general, global) through the economic security to the information security. The process nature of the relationships between the links of an dispersed structure indicates the need for the creation of the operational security. A particular role is played by the ICT as a strengthening factor for the widely understood potential of the company and its economic security in this area, e.g. in the framework of stimulating processes of a group learning, using of dispersed databases, or verifying generated knowledge in terms of the efficiency and certainty of the decision-making processes in dispersed structures. This article is a kind of an outline of the concept of the new H-H type structural solution (the hybrid of the hierarchical and heterarchical configurations), taking the criterion of an information and economic security into an account.
Źródło:
Information Systems in Management; 2014, 3, 1; 64-76
2084-5537
2544-1728
Pojawia się w:
Information Systems in Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 211

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