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Wyświetlanie 1-15 z 4980
Tytuł:
Polymer Single Screw Extrusion with Metered Feeding
Autorzy:
Wilczyński, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/115786.pdf
Data publikacji:
2011
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
Polymeric Materials
Single Screw Extrusion
Composite Modeling
Metered Feeding
Polymer Melting
Opis:
The state-of-the-art is presented for composite modeling of single screw extrusion of polymeric materials. The flood mode of feeding and metered mode of feeding are considered. A new inverse approach of composite modeling for metered fed single screw extrusion is discussed. Some experimental and theoretical results of the study are presented. The polymer melting behaviour and degree of filling of the screw channel during the process, as well as the pressure and temperature development are discussed.
Źródło:
Challenges of Modern Technology; 2011, 2, 1; 51-54
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Properties of Metals
Autorzy:
Kurzydłowski, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/2010997.pdf
Data publikacji:
1999-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
62.20.Fe
Opis:
Metals are one of the most widely used types of engineering materials. Some of their properties, e.g. elastic constants, can be directly related to the nature of the metallic bonds between the atoms. On the other hand, macro- and microstructural features of metals, such as point defects, dislocations, grain boundaries, and second phase particles, control their yield, flow, and fracture stress. Images of microstructural elements can be obtained by modern imaging techniques. Modern computer aided methods can be further used to obtain a quantitative description of these microstructures. These methods take advantage of the progress made in recent years in the field of image processing, mathematical morphology and quantitative stereology. Quantitative description of the microstructures are used for modeling processes taking place under the action of applied load at a given temperature and test (service) environment. These model considerations can be illustrated on the example of an austenitic stainless steel, which is an important material for power generating and chemical industry. Reports recently published also show that properties of materials can be significantly modified by the effect of free surface. Examples of such situations include environmental effect on the mechanical properties of materials. Data for an austenitic stainless steel is used to discuss contribution of the free surface to the mechanical properties of metals.
Źródło:
Acta Physica Polonica A; 1999, 96, 1; 69-79
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silicon everywhere
Autorzy:
Jakubowski, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/308053.pdf
Data publikacji:
2004
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
krzem
krzemionka
kwarc
struktura
silicon
silica
quartz
geo-chemical structure
Opis:
The paper discusses the ubiquity of silicon and its compounds in the geo-chemical structure of the Earth. The dominant role of mineral oxidized compounds of silicon as the building material of the primordial magma, metamorphic and sedimentary rocks is also shown. The reader's attention is also attracted to the numerous varieties of silicon compounds valued for their intrinsic beauty. Finally, methods of silicon production for electronics purposes are briefly addressed.
Źródło:
Journal of Telecommunications and Information Technology; 2004, 1; 3-6
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Professor Dr. hab. Jerzy Wazny, full member of the Polish Academy of Sciences (1927-2010)
Autorzy:
Krajewski, K.J.
Powiązania:
https://bibliotekanauki.pl/articles/29902.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
biography
Wazny Jerzy biography
Polish Academy of Sciences
full member
publication
scientific work
wood conservation
wood pathology
Źródło:
Folia Forestalia Polonica. Series B - Drzewnictwo; 2010, 41
0071-6685
Pojawia się w:
Folia Forestalia Polonica. Series B - Drzewnictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recent rapid climate changes in Antarctic and their influence on low diversity ecosystems
Autorzy:
Chwedorzewska, K.J.
Powiązania:
https://bibliotekanauki.pl/articles/12026.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
climate change
Antarctic
nutrient
ozone
temperature
ultraviolet radiation
water relation
human impact
low diversity
ecosystem
Opis:
The geographic position, astronomic factors (e.g. the Earth’s maximum distance from the Sun during winter), ice cover and altitude are the main factors affecting the climate of the Antarctic, which is the coldest place on Earth. Parts of Antarctica are facing the most rapid rates of anthropogenic climate change currently seen on the planet. Climate changes are occurring throughout Antarctica, affecting three major groups of environmental variables of considerable biological signifi cance: temperature, water, UV-B radiation. Low diversity ecosystems are expected to be more vulnerable to global changes than high diversity ecosystems.
Źródło:
Papers on Global Change; 2010, 17
2300-8121
1730-802X
Pojawia się w:
Papers on Global Change
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Business process modeling for the Shared Services Center in public administration. Legal and it aspects in management
Autorzy:
Tchórzewski, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/94765.pdf
Data publikacji:
2017
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
e-business
e-services
process modelling
Shared Services Center
outsourcing
Information System in Management
IT infrastructure
Opis:
In the paper the concept of Shared Service Center (SSC) for public administration is introduced. Processes and models of SSC are defined, but from the point of view of one of the main purpose of public administration– delivering public services. It is proposed to, while planning and implementing SSC, not only focus on designing services for organizational units participating in the SSC, but also to design solution for e-services for citizens. So the emphasis should be put, not only on modelling supporting processes just like for planning the implementation of commercial SSC, but also on core processes. Specific legal solutions are also pointed out, which are supporting this concept, from the point of view of organization of SSC (new Polish legislation) and from the point of view of funding the development of SSC (European Union operational programs supporting e-services for A2A and A2C).
Źródło:
Information Systems in Management; 2017, 6, 4; 330-342
2084-5537
2544-1728
Pojawia się w:
Information Systems in Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation of the effect of damping coefficients on spring diameter thickness
Autorzy:
Kadhim, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/2201068.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
process parameter
RSM analysis
damping force
test machine
parametr procesu
analiza RSM
optymalizacja
siła tłumienia
urządzenie badawcze
Opis:
Purpose The main objective of this research is to study the effect of damping coefficients on the damping strength of shock absorbers using Taguchi Design Experiment (DOE) and rough surface method in Design Expert 7.0.0. Design/methodology/approach To achieve and measure the damping force based on the data analysis in the design program. The effecting parameters are: damping diameter (A), gas pressure nitrogen in damping (B), and suspension velocity(C). Consequently, the experiment was carried out in the lab to measure the damping force based on the data analysis. Findings The experimental results demonstrated that nitrogen gas at a pressure of 40 bars is appropriate for dealing with motorcycles and that optimum parameter values may be achieved using ANOVA (Analysis of Variance), regression analysis, and confirmation studies. Research limitations/implications The measure of the damping force in this process widely depend on the technical specifications of a testing machine. Consequently, machine operating parameters consider the main limiting factor in this process. Practical implications In this current work, a steel spring of (50) mm diameter has been used in this experimental investigation to measure the influence of the damping force based on the data analysis. In addition, optimal working parameter values that maximize the performance were identified. The experimental test was planned and conducted according to the ANOVA (Analysis of Variance). Originality/value The validation of experimental results shows that this analysis gives an average error 5%, it’s also concluded that the gas at a pressure of 40 bars is appropriate for dealing with motorcycles and can be adopted safely.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 115, 1; 16--25
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safety and Quality Issues as Part of a Holistic (i.e., Sociotechnological) Approach
Autorzy:
Zink, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/89799.pdf
Data publikacji:
1999
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
holistic approach
occupational health and safety
quality management
sociotechnological approaches
podejście holistyczne
bezpieczeństwo i higiena pracy
zarządzanie jakością
Opis:
In the past, many so-called management concepts were not very successful because of their fragmented approach. This is also true for topics like safety and quality. Here, technical aspects often predominated while disregarding the equally important need for a change of attitude. On the other hand, awareness was created by timely limited programmes. The paper deals with integrating quality and safety in holistic (management) concepts, which are described first before being discussed in detail.
Źródło:
International Journal of Occupational Safety and Ergonomics; 1999, 5, 2; 279-290
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer simulation of vibration surveillance of discretely idealised mechanical systems. Part II: Tool-workpiece vibration in a non-stationary model of the cutting process
Autorzy:
Kaliński, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/1955704.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
machine tools
modelling
control
simulation
Opis:
The problems of tool-workpiece vibration surveillance during machining have been researched. The object of investigation has been analysed, and cutting dynamics and calculation model creation described. Various approaches to and computer simulations of non-stationary model vibration surveillance are explained, based upon optimal spindle speed control and step-changing spindle speed control. A procedure is developed for computer prediction of results of the programme-controlled spindle speed surveillance strategy. Performance results are compared with those measured on a VMC FADAL 4020HT milling machine.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 1; 89-101
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer simulation of vibration surveillance of discretely idealised mechanical systems. Part I: Optimal control at the energy performance index for open non-stationary systems
Autorzy:
Kaliński, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/1955706.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
dynamics
control
simulation
railway weighing systems
Opis:
The paper discusses means of mechanical vibration surveillance using elements of control theory, dynamic optimisation, modern methods of computer simulation and measurement techniques. A mixed method of rigid and flexible finite elements is applied to discrete modelling of non-stationary controlled systems. A method of vibration surveillance in the time domain is elaborated, which utilises optimal control at the energy performance index with respect to the trajectory of given motion. An example is given of surveillance of transient vibration of a railway freight wagon weighing device.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 1; 79-87
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control zeros and maximum-accuracy / maximum-speed control of LTI MIMO discrete-time systems
Autorzy:
Latawiec, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/970092.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
układ wielowymiarowy
multivariable systems
system zeros
minimum phase systems
cheap control
perfect regulation
perfect filtering
time-optimal control
Opis:
Based on new definitions of "control zeros" and minimum phase property for possibly nonsquare LTI MIMO discrete-time systems, generalizations of perfect regulation and perfect filtering are presented both for polynomial matrix and state space models. Consequently, general equivalence results are announced for multi-step and single-step optimal controls as well as for maximum-accuracy and maximum-speed controls for LTI MIMO discrete-time systems. The latter is made visible after the introduction of a new-category of time-optimal control, namely infimum-time control. The equivalence conditions refer to the system's right-invertibility and the (newly-defined) minimum phase behavior, which demonstrates the usefulness of the new approach to zeros of multi variable systems.
Źródło:
Control and Cybernetics; 2005, 34, 2; 453-475
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decomposition of fractionated rye bran by cellulase complexes of various strains of the fungus Armillariella mellea (fr. ex. Wahl) P. Karsten
Rozkład frakcjonowanych otrąb ziarna żyta przez kompleksy celulaz różnych szczepów grzyba Armillariella mellea (fr. ex. Wahl) P. Karsten
Autorzy:
Chrapkowska, K.J.
Powiązania:
https://bibliotekanauki.pl/articles/1398380.pdf
Data publikacji:
1985
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
fractlonation of rye bran
cellulase complexes
Armillariella mellea
Opis:
The fractionation of rye bran, done on a type DMK 0.81-4M DDR laboratory sifter, provided bran fractions with different contents of proteins, starch, cellulose and sugars. As a result of treatment of the bran fractions and unfractionated bran with cellulase complexes of various strains of the fungus Armillariella mellea, a higher degree of protein extraction from the fractions' aleuronic layer with a simultaneous higher degree of cellulose hydrolysis and reducing sugars increment as compared to the values for unfractionated bran, were obtained.
Przeprowadzono frakcjonowanie otrąb żytnich na odsiewaczu laboratoryjnym typ DMK 0.81-4M DDR. Dzięki temu zabiegowi uzyskano frakcje otrąb o zróżnicowanej zawartości białek, skrobi, celulozy i cukrów redukujących. Również udział procentowy poszczególnych frakcji był zróżnicowany (rys. 1). Charakterystyka chemiczna frakcji otrąb wykazała różną zawartość poszczególnych składników: białka, skrobi, celulozy i cukrów (tab. 1), co stwarza możliwości różnego ich technologicznego zastosowania i wykorzystania zarówno na cele żywieniowe człowieka, jak i paszowe zwierząt. W wyniku hydrolitycznego działania kompleksów celulaz różnych szczepów grzyba Armillariella mellea (Fr. ex. Wahl) P. Karslen na frakcje otrąb żytnich uzyskano wyższy stopień wydobycia białek z warstwy aleuronowej oraz większy rozkład celulozy przy równoczesnym większym przyroście cukrów redukujących, w porównaniu ich z wartościami dla otrąb niefrakcjonowanych (tab. 2). Najwyższy stopień uwalniania białek warstwy aleuronowej otrzymano pod wpływem działania kompleksów celulaz wszystkich trzech szczepów na frakcje otrąb nr 6 (zlot), (tab. 2) zawierającą najniższy procentowy udział celulozy w porównaniu z otrębami całymi i pozostałymi frakcjami (tab. 1). Z przebadanych trzech szczepów grzyba Armillariella mellea najaktywniejszy był szczep AśW-26 i to zarówno w działaniu na otręby niefrakcjonowane, jak i ich frakcje.
Źródło:
Acta Alimentaria Polonica; 1985, 11, 2; 169-176
0137-1495
Pojawia się w:
Acta Alimentaria Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear Magnetic Relaxation Dispersion Study of Human Serum Proteins Solutions
Autorzy:
Olszewski, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/1920946.pdf
Data publikacji:
1992-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.90.+d
87.45.-k
Opis:
Nuclear magnetic relaxation dispersion profiles in the Larmor frequency range of 0.02-50 MHz and 277 K has been studied for human serum proteins: albumin, γ-globulins and α, β-globulins in aqueous solutions 3-14 per cent by weight of protein. The linear concentration dependences have been found both for the longitudal relaxation rates for water protons and the dispersive and non-dispersive parts of relaxation profiles. The frequency dependent relaxivities have been calculated, the hydrodynamic effect for the albumin macromolecule Brownian rotational correlation time has been observed and analyzed. The importance of molecular weight of protein for the relaxation processes and its influence for magnetic resonance imaging contrast was discussed.
Źródło:
Acta Physica Polonica A; 1992, 82, 3; 487-494
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Network Models and the Symbolic Solution of Network Equations
Autorzy:
Reinschke, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/908328.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sieć wielowymiarowa
teoria grafów
history of network theory
network graphs
network equations
modified nodal analysis
admittance representation of multi-ports
multidimensional networks
Opis:
This paper gives an overview of the formulation and solution of network equations, with emphasis on the historical development of this area. Networks are mathematical models. The three ingredients of network descriptions are discussed. It is shown how the network equations of one-dimensional multi-port networks can be formulated and solved symbolically. If necessary, the network graph is modified so as to obtain an admittance representation for all kinds of multi-ports. N-dimensional networks are defined as graphs with the algebraic structure of N-dimensional vectors. In civil engineering, framed structures in two and three spatial dimensions can be modeled as 3-dimensional or 6-dimensional networks. The separation of geometry from topology is a characteristic feature of such networks.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2001, 11, 1; 237-269
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lab-scale investigations during combustion of agricultural residues and selected Polish coals
Autorzy:
Kordylewski, W.K.
Mościcki, K.J.
Witkowski, K.J.
Powiązania:
https://bibliotekanauki.pl/articles/185338.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
biomasa
węgiel
popiół
chlor
żużlowanie
biomass
coal
ash
chlorine
slagging
Opis:
Preliminary lab-scale investigations were conducted on slagging abatement in biomass-firing by fuel mixing. Three agriculture biomass fuels and olive cake were used in the experiments. Polish lignites and bituminous coals were examined as anti-sintering additives. The effects of chlorine release, potassium retention and ash sintering were examined by heating samples of biomass fuels and additives in the muffle oven and, next, firing them in the laboratory down-fired furnace at the temperature in the range of 800–1150ºC. The obtained slag samples were analysed on: chlorine and potassium content, sintering tendency and crystalline components. Among the examined coals lignite from Turów mine and bituminous coal from Bolesław Śmiały mine appeared to be the most effective in potassium retention in aluminosilicate and chlorine release from slag. Possibly the major factor of these coals which reduced ash sintering was relatively high content of kaolinite.
Źródło:
Chemical and Process Engineering; 2014, 35, 2; 249-262
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 4980

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