Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Jędrzejewski, J." wg kryterium: Autor

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 46
Tytuł:
On a mathematical model of a heat exchange process in conductors
Matematyczny model procesu wymiany ciepła w przewodnikach
Autorzy:
Jędrzejewski, J.
Skopiec, J.
Powiązania:
https://bibliotekanauki.pl/articles/741307.pdf
Data publikacji:
1974
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Applicationes Mathematicae; 1974-1975, 14, 3; 403-413
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global Structure of the Falicov-Kimball Model Ground State Phase Diagram
Autorzy:
Lach, J.
Łyżwa, R.
Jędrzejewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929588.pdf
Data publikacji:
1993-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Mb
71.30.+h
Opis:
The two-state spinless Falicov-Kimball model on a one-dimensional lattice is studied by means of well-controlled numerical procedures. Restricted phase diagrams in the grand-canonical ensemble and at zero temperature are constructed. The evolution of these phase diagrams, as the interaction parameter U is varied, including the band structures corresponding to configurations of localized particles (ions) and densities of mobile particles (electrons), is monitored. The changes observed enable us to draw conclusions for the global structure of the phase diagram and to make a qualitative plot of such a diagram. Particular attention is paid to the possibility of conductor-insulator transitions. The results obtained suggest that the system is an insulator for all U only if the electron and ion densities ρ$\text{}_{e}$,ρ$\text{}_{i}$ satisfy the conditions: ρ$\text{}_{e}$ + ρ$\text{}_{i}$ = 1, |ρ$\text{}_{i}$ - 1/2| ≤ δ < 1/2. For all other pairs (ρ$\text{}_{e}$,ρ$\text{}_{i}$) there is a critical U at which the system undergoes a conductor-insulator transition.
Źródło:
Acta Physica Polonica A; 1993, 84, 2; 327-344
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza właściwości trakcyjnych koła mikrociągnika w różnych technologiach uprawy wybranych roślin
Analysis of traction properties of a microtractor wheel in various technologies of selected plants cultivation
Autorzy:
Białczyk, W.
Czarnecki, J.
Pieczarka, K.
Jędrzejewski, M.
Cudzik, A.
Powiązania:
https://bibliotekanauki.pl/articles/292188.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
siła trakcyjna
koło
zwięzłość
technologia uprawy
traction forces
wheel
compactness
technologies of tillage
Opis:
W pracy przedstawiono wyniki badań właściwości trakcyjnych koła mikrociągnika w uprawach pszenżyta ozimego i grochu dla różnych uproszczeń uprawowych. Mierzono maksymalną siłę trakcyjną. W celu pełnego opisu badań zmierzono parametry fizyczne gleby oraz wyznaczono maksymalne naprężenia ścinające i zwięzłość gleby. Wykazano wpływ rośliny pszenżyta i grochu na wartości mierzonych parametrów. Siły trakcyjne generowane w uprawie bezorkowej cechowały się mniejszą zmiennością. Określono optymalny przedział obciążenia pionowego.
The paper presents results of a study of traction parameters of a microtractor wheel in different cultivation technologies of winter triticale and pea. The maximum traction forces were measured along with physical parameters of soil. Maximum cutting stress and soil compactness were also measured. As was found, there was a relation between triticale and pea plants and the values of studied parameters. Differences in traction forces generated in no-tillage technology were insignificant. Optimal range for vertical loading was determined.
Źródło:
Inżynieria Rolnicza; 2005, R. 9, nr 3, 3; 47-54
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of two FEA-based approaches in prediction of workpiece-fixture static behaviour
Autorzy:
Grochowski, M.
Jedrzejewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1429289.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
workpiece
fixture
quasistatic analysis
Opis:
Simulating of workpiece and fixture behaviour is commonly done with the use of Finite Element Analyses. In the most, if not all, cases researchers usually use traditional implicit integration scheme FEM codes (e.g. ANSYS, ABAQUS/Standard, NASTRAN, FEAP). In this paper a different approach is proposed. FEM code of ABAQUS/Explicit, based on explicit integration of equations of the motion is used to predict workpiece behaviour during alignment and fixing process in quasistatic state. Comparison of results obtained using both implicit and explicit techniques is also presented, results and differences are discussed.
Źródło:
Journal of Machine Engineering; 2008, 8, 3; 54-65
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid Modelling of Machine Tool with Integrated Cooling System
Autorzy:
Bukowski, A.
Grochowski, M.
Jedrzejewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/971101.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
mechatronic model
machine tool
cooling system
Opis:
In this paper, a method of hybrid modelling of machine's mechanic structure together with mechatronic cooling system of its body is presented. In this method, a FEM model, traditionally used for thermal analyses of machine's thermal behaviour, has been integrated with mechatronic model of cooling system, implemented in MATLAB. In such way, a hybrid model has been created, allowing to simulate the control of machine body cooling process. Applied simulation of cooling the region of body, adjacent to the guide, illustrates the possibility of controlling the temperature in chosen points of the machine tool, in transient state, which would ensure minimal body deformations, small enough not to require compensation, which is generally hard and of limited precision. Thermal model of machine tool has been built with the use of SATO system [1]. In this work, time-domain temperature changes with and without the use of regulation by means of PID regulator have been compared. Results of the simulation show the usefulness of presented hybrid modelling method for the improvement of machine tool thermal behaviour.
Źródło:
Journal of Machine Engineering; 2008, 8, 1; 84-93
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Limiting Precision Distortions in Spindle Unit of HSC Machining Centre
Autorzy:
Jedrzejewski, J.
Kwasny, W.
Modrzycki, W.
Powiązania:
https://bibliotekanauki.pl/articles/971113.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
HSC
machine tool
precision
distortion
Opis:
The paper presents causes of excessive precision distortions, appearing in electrospindles of HSC machining centres. The influence of changing ambient temperature is shown, as well as the precision of its modelling. Phenomena, which appear in the electrospindle unit during large rotational speed changes, have been presented and the functioning of bearing loading sleeve has been shown, which has the task of compensating thermal expansions of a spindle. Conditions of proper functioning of the sleeve have been presented, which should assure minimal displacements of a spindle. Also, possibilities of increasing bearing life span have been pointed out.
Źródło:
Journal of Machine Engineering; 2008, 8, 1; 44-53
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechatronic approach to the development of an intelligent fixturing device test-bed
Autorzy:
Bukowski, A.
Kwasny, W.
Jedrzejewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1429310.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
mechatronic approach
active fixturing system
intelligent controller
Opis:
In order to improve the process of designing mechatronic devices, an approach, based on a mechatronic model, is proposed. The structure of such model is presented, consisting of partial models of single elements in a system. Methods of creating these models and integrating them into one mechatronic model are discussed. In order to illustrate the approach, a case study is shown, consisting of a mechatronic alignment and fixing device for high-precision machine tools. A test bed of such device is under construction, which will allow experimental verifying partial models of components, as well as the entire system's mechatronic model. An extended set of monitoring sensors will provide accurate system behaviour data useful for such process.
Źródło:
Journal of Machine Engineering; 2008, 8, 3; 66-76
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling the behaviour of a contact layer between the workpiece and a locator
Autorzy:
Maciolka, P.
Jedrzejewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1429343.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
roughness
contact
model
Opis:
The assurance of high precision alignment of workpieces with low stiffness requires thorough knowledge about the phenomena taking place in the contact area under the influence of forces exerted by actuators. It is indispensable to utilise the model of a contact and deformations taking place in it. In order to solve the problem of contact, the contact geometry was modelled by means of a flat and rough surface model based on stereometric measurements, as well as by means of the finite element method (FEM). In a FEM method, a spherical structure of the surface layer was assumed and only one zone was taken into consideration, i.e. 0.4.Rt (maximum surface roughness). Zone structure allows easy changing of mechanical properties of material during the introduction of data defined by a strengthening curve in the plastic region. The possibility of expanding the model by consecutive zones allows taking into consideration the physical properties in complex analyses of the surface layer. This paper presents the problem of contact related to the alignment and fixing process, a model of contact deformations between a flat and a rough surface, as well as the algorithm for determining the model of a surface profile according to the bearing ratio curve.
Źródło:
Journal of Machine Engineering; 2008, 8, 3; 42-53
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Precise model of HSC Machining Centre for aerospace parts machining
Autorzy:
Jedrzejewski, J.
Kwasny, W.
Kowal, Z.
Modrzycki, W.
Powiązania:
https://bibliotekanauki.pl/articles/1429344.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machining centre
model
aerospace
precision
Opis:
This article shows the aspects of precise modelling of precise High-speed Machining Centres for High-Speed Cutting (HSC) of parts used in the aerospace industry. The main focus was made on the thermal errors having a dominant influence on the precision of machining. Main assumptions for a hybrid thermal model of a centre thermal behaviour have been stated, taking into account the characteristics of heat sources. On the example of a 3-axis machining centre, measured runs of heating up and heat displacements have been shown, compared to these determined with the use of simulations of a behaviour in assumed working conditions. A special attention was drawn to the phenomena taking place in motorspindles, as well as to the displacements of a spindle face during high rotational speeds of spindles and step changes of rotational speeds. The significance and influence of the bearing preload and centrifugal forces on the spindle axial displacements was shown, which is decisive on the precision of part machining. Additionally, it was shown that the important component of a machining error is an error of spindle position identification by means of a linear encoder, resulting from the thermal deformation of a centre body, to which a quartz linear encoder is fixed.
Źródło:
Journal of Machine Engineering; 2008, 8, 3; 29-41
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Process - machine tool thermal interaction
Autorzy:
Jedrzejewski, J.
Grzesik, W.
Kwasny, W.
Modrzycki, W.
Powiązania:
https://bibliotekanauki.pl/articles/1429322.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machine tool
cutting process device
part
interaction
Opis:
Hereby paper shows the structure of mutually connected thermal interactions in a machine tool, a tool and a workpiece, which finally leave their traces on a machined workpiece in form of machining errors. Thermal interactions of a machine tool and the environment on own and workpiece errors were discussed. Thermal interaction cases were considered, connected with the varying environment and the main drive operation, as well as total influence of the varying environment, main drive and two drives of controllable axes. The interactions of the cutting process itself were discussed, assuming three basic mechanisms: thermal, physically-mechanical and tribological. On the example of turning it was proven that the character of changes in total influences between the tool and workpiece has the shape of a temperature curve.
Źródło:
Journal of Machine Engineering; 2008, 8, 3; 91-106
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Bragg and Polarimetric Optical Fiber Sensors for Stress Monitoring in Composite Materials
Autorzy:
Domanski, A.
Lesiak, P.
Milenko, K.
Budaszewski, D.
Chychlowski, M.
Ertman, S.
Tefelska, M.
Wolinski, T.
Jedrzejewski, K.
Lewandowski, L.
Jasiewicz, W.
Helsztynski, J.
Boczkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1795792.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.81.Gs
42.81.Pa
62.23.Pq
Opis:
Composite structures are made of two or more components with significantly different physical or chemical properties and they remain separate and distinct in a macroscopic level within the finished structure. This feature allows for introducing optical fiber sensors into the composite material. These sensors can demonstrate stress distribution inside tested material influenced by external tensions. Two types of the optical fiber sensors are used as the 3D structure. One of them is based on application of fiber Bragg grating inside the core of the fiber. Longitudinal stress changes parameters of the Bragg grating and simultaneously, spectral characteristics of the light transmitted through the fiber. The second one is based on application of highly birefringent fibers which, under external stress, introduce polarization changes of the output light.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 294-297
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of High Performance Machine Tools
Autorzy:
Jędrzejewski, J.
Kwaśny, W.
Powiązania:
https://bibliotekanauki.pl/articles/971145.pdf
Data publikacji:
2009
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machine tool
development
precision
performance
intelligence
Opis:
This paper presents a general characteristic of modern cutting machine tools and their role in achieving high machining performance. The determinants of machine tool development, stemming from the constant development of products and their complexity and from market demands, are discussed in detail. Special attention is devoted to the improvement of the machine tool structure and its variations created in response to the continuous and flexible increase in machining efficiency. The importance of developing multitask, hybrid and reconfigurable structures is discussed. The essence of the development of multi-spindle units as the modules having a decisive influence on machining performance, precision and costs is described. Moreover, trends in the development of feed units and distance measuring systems are presented.
Źródło:
Journal of Machine Engineering; 2009, 9, 2; 5-31
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On cluster sets of connected functions
Autorzy:
Jędrzejewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/121665.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:
funkcje matematyczne
przestrzeń topologiczna
topologia ogólna
mathematical function
topological space
general topology
Opis:
In the article we discuss some properties of a few classes of connected functions and cluster sets of functions from those classes.
Źródło:
Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2009, 14; 51-61
2450-9302
Pojawia się w:
Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 46

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies