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Wyświetlanie 1-15 z 53
Tytuł:
Adam Bartecki (1920-2010) - szkic o życiu i twórczości
Adam Bartecki (1920-2010) - an essay on his life and work
Autorzy:
Cieślak-Golonka, M.
Starosta, J.
Powiązania:
https://bibliotekanauki.pl/articles/172023.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
związki chromu
spektroskopia
widma elektronowe
analiza komputerowa
biografia naukowa
Bartecki Adam
Źródło:
Wiadomości Chemiczne; 2011, 65, 7-8; 533-556
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of crystallographic texture and residual stresses of aluminium alloy RSA-501 after selected processes of twist extrusion (TE)
Autorzy:
Byczkowska, P.
Sawicki, J.
Adamczyk-Cieślak, B.
Januszewicz, B.
Powiązania:
https://bibliotekanauki.pl/articles/24200596.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
severe plastic deformation
twist extrusion
aluminium
FEM
crystallographic texture
stress
hardness
odkształcenie plastyczne
wyciskanie skrętne
tekstura krystalograficzna
naprężenie
twardość
Opis:
Purpose: This study presents the residual stress analysis for the twist extrusion (TE) process after the experiment and numerical simulation and the analysis of the crystallographic texture changes and changes in hardness before and after the TE process for an RSA-501 aluminium alloy (Al; Mg5%; Mn1.5%; Sc0.8%; Zr0.4%). Design/methodology/approach: Crystallographic textures were obtained with the PANAlytical Empyrean X-ray diffractometer. The stresses were measured by applying the X-ray method with the use of using the PROTO iXRD diffractometer. Findings: The use of severe plastic deformation processes in the mass of the material leads to a significant change difference in the stress distribution in the workpiece and a change in texture compared to the reference material. The stress distribution in the sample cross-section and stress values varied and depended on the stage of the twisting process to which the surface was subjected. The highest stress (about 600 MPa) appears at the peaks of the front surface when exiting the twist area die TE. Higher stress values at the edges of the specimen are caused by friction (deformation) of the material against the die surface. The TE process strengthened – the highest crystallographic texture background level was 49%. Practical implications: The conducted tests and the obtained results allow the determination of the process parameters and critical areas of the sample by carrying out a numerical simulation. Originality/value: Microhardness increases due to the TE process and the largest values were observed at the edges. This phenomenon is confirmed by the numerical simulation results presented in this paper.
Źródło:
Archives of Materials Science and Engineering; 2022, 118, 1; 5--28
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An impact of engine downsizing on change of engine weight
Autorzy:
Sroka, Z. J.
Cieślak, M.
Powiązania:
https://bibliotekanauki.pl/articles/247468.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
downsizing
weight change
Opis:
One of the trends for development of internal combustion engine is downsizing, which in its final form leads to reduction of fuel consumption and limitation of carbon dioxide concentration in the exhaust gases. The obvious effect of reducing the volume of a cylinder is to reduce the dimensions of the various components, e.g. piston with rings and pin, connecting rod, crankshaft, engine block etc. Changes of geometric dimensions also affect the change in mass of each element and consequently − the whole engine. Expected weight reduction will be a benefit in considering downsizing techniques as another significant development trend in automotive applications associated with a reduction in the weight of the complete vehicle – called “light weight vehicle”. The paper discusses the various forms of downsizing (by stroke, by diameter and mix) and their impacts on the changes in engine mass. The engine Subaru Flat 4, constructed with standard components in terms of design and materials was tested by virtual recognition in mass changes. Original drawings of components and sets have been simplified by for example does not account for chamfers and chops. When calculating also omitted the weight of typical accessories (e.g. fuel lines or electronic components), assuming that each considered option has the same equipment. The highest change in the weight of minus 7.27 % relative to the standard engine was done with downsizing by diameter and smallest one (-6.09 %) by downsizing mix.
Źródło:
Journal of KONES; 2015, 22, 2; 213-219
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An overview of coal bed methane potential in Polish coal basins
Autorzy:
Cieślak, K.
Hendel, J.
Kuczyński, S.
Powiązania:
https://bibliotekanauki.pl/articles/299024.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Lower Silesian Coal Basin (LSCB)
Lubin Coal Basin (LCB)
RECOPOL
Upper Silesia Coal Basin (USCB)
coal bed methane (CBM)
Opis:
Coal bed methane (CBM) may become an important source of energy in Upper Silesian Coal Basin. Coal bed methane in Poland occurs within three coal basins of which the best recognized and most promising is the Upper Silesian Coal Basin. Approximately 80.1% of proved balance of coal deposits resources in Poland occurs in the Upper Silesian Coal Basin, where 50 fields are operated by 28 mines. Thus, since early 90s of the 20th century the USCB is attractive for foreign companies which perform evaluation of coal bed methane obtaining possibility as main fossil. However, all previous attempts to commercial production of CBM did not bring expected results, but they constitute extensive information database for current and future research towards CBM exploitation. Prognostic resources of coal bed methane in USCB are estimated to 107 bln m3. Recoverable balance resources are estimated to 87.6 bln m3. Much smaller perspectives are related to the poorly identified regions of Lublin Coal Basin and Lower Silesian Coal Basin. It is estimated that balance resources of hard coal in LCB, represents approximately 19.2% of Polish hard coal balance resources.
Źródło:
AGH Drilling, Oil, Gas; 2013, 30, 4; 433-441
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza ryzyka eksploatacyjnego w polskim zakładzie wzbogacania węgla
Analysis of operational risk in a Polish coal preparation plant
Autorzy:
Cieślak, W.
Sablik, J.
Martyniak, J.
Wycisk, H.
Powiązania:
https://bibliotekanauki.pl/articles/318586.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
ryzyko eksploatacyjne
zakład wzbogacania węgla
operational risk
coal preparation plant
Opis:
W artykule przedstawiono metodykę i wyniki badań umożliwiających charakterystykę zakładu wzbogacania węgla metodą analizy ryzyka w zakresie eksploatacji oraz wnioski, które mogą być wykorzystane przy podejmowaniu decyzji w zakresie zarządzania produkcją oraz decyzji inwestycyjnych.
The article presents methodology and results of studies, which allow to characterise a coal preparation plant by means of operational risk analysis and to draw conclusions which could be used for making production management and investment decisions.
Źródło:
Inżynieria Mineralna; 2002, R. 3, nr 1, 1; 21-30
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza zastosowan i przyklad systemu ekspertowego w zagadnieniach suszenia i przechowywania produktow rolniczych
Autorzy:
Trajer, J
Cieslak, J W
Izdebski, W
Iwanski, C
Powiązania:
https://bibliotekanauki.pl/articles/807094.pdf
Data publikacji:
1994
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
przechowywanie
zastosowanie
suszenie
zboza
ziarno
systemy ekspertowe
doradztwo rolnicze
Opis:
W pracy przedstawiono przykład budowy prototypu systemu ekspertowego dotyczącego suszenia i przechowywania ziarna zbóż. Przeprowadzono też krótką analizę możliwości zastosowań systemów ekspertowych w doradztwie rolniczym.
An example of building prototype expert system regarding drying and storage of cereal grain was presented. Possible applications of the expert systems in agricultural advisory were briefly analysed, either.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 1994, 417; 217-222
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of risk and failure scenarios in water supply system
Autorzy:
Boryczko, K.
Rak, J.
Tchórzewska-Cieślak, B.
Powiązania:
https://bibliotekanauki.pl/articles/2069508.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
fault tree analysis
matrix methods
risk analysis
water supply system
Opis:
Water supply system is complicated technical system which belongs to underground urban infrastructure. Its accurate functioning determines everyday live stability of citizens. Risk analysis is a key phase of the process of water supply safety management. The aim of this paper is to present new propose of methods for risk of the first type (associated with quantity of supplied water) and the risk of the second type (associated with quality of supplied water) analyses in water supply system. The paper contains the description of matrix methods for risk analyses and methods describing cause-and-effect relationship of failure events (fault tree analysis).
Źródło:
Journal of Polish Safety and Reliability Association; 2014, 5, 2; 11--18
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbohydrates in Colobanthus quitensis and Deschampsia antarctica
Autorzy:
Piotrowicz-Cieslak, A I
Gielwanowska, I.
Bochenek, A.
Loro, P.
Gorecki, R.J.
Powiązania:
https://bibliotekanauki.pl/articles/59067.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
soluble sugar
monosaccharide
oligosaccharide
carbohydrate
cyclitol
starch
vegetative tissue
Deschampsia antarctica
sugar
Colobanthus quitensis
raffinose
tissue
galactosyl cyclitol
Opis:
Eight to nineteen ethanol-soluble carbohydrate components were identified in vegetative tissues of Colobanthus quitensis and Deschampsia antarctica. The analysed carbohydrates included: monosaccharides, cyclitols, galactosyl cyclitols, raffinose family oligosaccharides, lichnose family oligosaccharides, kestose family oligosaccharides. The analysed vegetative tissues accumulated from 447 to 139 mg/g d.m. soluble carbohydrates in Colobanthus quitensis, Deschampsia antarctica respectively. The raffinose family oligosaccharides constituted 53.3% in Colobanthus quitensis of the identified soluble carbohydrate component pool. Vegetative tissues accumulated starch in Colobanthus quitensis 20.6 mg/g d.m. and 261.6 mg/g d.m. in Deschampsia antarctica. Anatomical and ultrastructural observations of vegetative part of Colobanthus quitensis and Deschmpsia antarctica revealed the presence of various ergastic materials in intercellular spaces, cell walls and protoplasts. Various parts of these plants contain insoluble, PAS positive polysaccharides in intercellular spaces and in cell walls. Chloroplasts of analysed tissues contained starch. Less starch was visible in young, growing parts of shoots of Colobanthus quitensis and Deschmpsia antarctica, more starch appears in mature, differentiated parts.
Źródło:
Acta Societatis Botanicorum Poloniae; 2005, 74, 3
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer Simulation of the Formation of Non-Metallic Precipitates During a Continuous Casting of Steel
Autorzy:
Kalisz, D.
Żak, P. L.
Tokarski, T.
Wzorek, Ł.
Suchy, J. S.
Kiczor, M.
Cieślak, W.
Powiązania:
https://bibliotekanauki.pl/articles/958226.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
non-metallic oxide precipitates
modelling
continuous casting of steel
crystallization
Opis:
The authors own computer software, based on the Ueshima mathematical model with taking into account the back diffusion, determined from the Wołczyński equation, was developed for simulation calculations. The applied calculation procedure allowed to determine the chemical composition of the non-metallic phase in steel deoxidised by means of Mn, Si and Al, at the given cooling rate. The calculation results were confirmed by the analysis of samples taken from the determined areas of the cast ingot. This indicates that the developed computer software can be applied for designing the steel casting process of the strictly determined chemical composition and for obtaining the required non-metallic precipitates.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 335-340
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Copper and Arsenical Copper During Eneolithic in Metallographic and Mechanical Properties Examination
Autorzy:
Garbacz-Klempka, A.
Kozana, J.
Piękoś, M.
Cieślak, W.
Perek-Nowak, M.
Kowalski, Ł.
Adamczak, K.
Łoś, J.
Powiązania:
https://bibliotekanauki.pl/articles/382382.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nondestructive testing
copper
arsenical copper
archaeometallurgy
casting
metallographic properties
Eneolith
badania nieniszczące
miedź
archeometalurgia
odlewnictwo
właściwości metalograficzne
epoka miedzi
Opis:
Arsenical copper has been used since 5th millennium cal.BC, later exchanged by application of Cu-Sn alloys in metallurgy. This work presents the results of metallographic and mechanical properties studies performed on two flat axes connected with local Eneolithic societies (4500-3000 cal.BC). The axes are one of the oldest metal artifacts from Polish land. Originally they were made from Cu-As alloy, and their chemical composition was established by X-ray fluorescence spectroscopy (XRF). Their microstructure was analysed using optical microscopy (OM) and scanning electron microscopy conducted with energy-dispersive X-ray spectroscopy (SEM-EDS). The macrostructure analysis (OM) of the axes was performed as well. On the basis of the results, the alloys used in the Eneolithic to cast the axes were reproduced in lab. In order to achieve the characteristics of the alloys, their mechanical properties including ultimate tensile strenght (UTS), hardness (HB), microhardness (HV0,1) and ductility were examined. The solidification process was studied by means of thermal analysis.
Źródło:
Archives of Foundry Engineering; 2015, 15, 4 spec.; 23-28
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crisis situation management issues in urban areas water supply
Autorzy:
Tchórzewska-Cieślak, B.
Pietrucha-Urbanik, K.
Bajer, J.
Powiązania:
https://bibliotekanauki.pl/articles/2069035.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
water supply system
crisis situation
critical infrastructure
Opis:
In paper the methods of comprehensive analysis of reliability, safety and operation of the water supply system were presented. The main goal of this work is to present the problems associated with the WSS functioning in terms of belonging to critical infrastructure. The analysis of the WSS functioning in face of emergency events occurrence should be one of the priority actions taken by the water companies. The paper presents an application of reliability and safety analysis of water supply in emergency situations.
Źródło:
Journal of Polish Safety and Reliability Association; 2015, 6, 2; 135--146
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Different effects of soil drought on soluble carbohydrates of developing Lupinus pilosus and Lupinus luteus embryos
Autorzy:
Piotrowicz-Cieslak, A I
Michalczyk, D.J.
Adomas, B.
Gorecki, R.J.
Powiązania:
https://bibliotekanauki.pl/articles/57870.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
plant physiology
carbohydrate
cyclitol
raffinose family oligosaccharide
soil drought
soil humidity
seed
Lupinus luteus
Juno cultivar
Lupinus pilosus
drought
lupin
embryo
galactosyl cyclitol
Opis:
The aim of this study was to compare the accumulation of soluble carbohydrates in embryos of two lupin species: cultivated Lupinus luteus (cv. Juno) and wild L. pilosus, developing on plants grown under normal soil humidity and soil drought. All analysed seeds accumulated soluble carbohydrates, including: monosaccharides, sucrose, cyclitols, galactosyl cyclitols and raffinose family oligosaccharides. Soil drought caused a nearly two-fold increase of soluble carbohydrate contents in both species. L. pilosus embryos however, responded to water deficiency by increasing the accumulation of cyclitols and galactosyl cyclitols, whereas L. luteus embryos enhanced accumulation of cyclitols and raffinose family oligosaccharides.
Źródło:
Acta Societatis Botanicorum Poloniae; 2007, 76, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Entropy Change Calculations for Pure Gd and a Ni-Mn-Cu-Ga Heusler Alloy: Constant Field vs. Constant Temperature Experiment
Autorzy:
Ferenc, J.
Kowalczyk, M.
Wróblewski, R.
Cieślak, G.
Sielicki, K.
Leonowicz, M.
Kulik, T.
Powiązania:
https://bibliotekanauki.pl/articles/1402338.pdf
Data publikacji:
2015-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
65.40.gd
Opis:
The magnetocaloric effect may be assessed indirectly by expressing it as the change in magnetic entropy in varying magnetic field, H, as the function of temperature, T. Magnetization, M=f(T,H), may be experimentally acquired from a series of isothermal measurements with variable field, or from a series of constant field measurements with variable temperature. The accuracy of magnetic entropy calculation depends on the number of series in these experiments. The aim of this work is to determine how little data is sufficient to obtain accurate results of magnetic entropy change calculations, on the basis of real, magnetocaloric materials. Pure gadolinium and a Ni-Mn-Cu-Ga Heusler alloy were studied. For both materials, the magnetic entropy change and relative cooling power were calculated from both experiments, with the decreasing number of experimental data. For both materials, the constant field experiment with only 6 field values provided only a 5% error of calculations, as compared to the experiment with 100 field values. The Arrott plots were also drawn for constant field mode with 6 field values, easily indicating the order of transition. Comparison of the calculation results suggests that the constant field mode magnetization measurement may be more accurate and faster than isothermal mode.
Źródło:
Acta Physica Polonica A; 2015, 128, 1; 111-115
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Failure risk analysis in the water supply sector management
Autorzy:
Tchórzewska-Cieślak, B.
Rak, J. R.
Pietrucha, K.
Powiązania:
https://bibliotekanauki.pl/articles/2069627.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
water supply
risk management
safety
critical infrastructure
Opis:
The subject and main purpose of this study is to develop risk analytic model for the design and operation of water supply sector. A water supply system belongs to the critical infrastructure of cities, and it should be a priority task for waterworks and even for the local authorities to ensure the suitable level of its safety. A water supply systems (WSS) ought to be high reliable continuous operating system. Failure factors in WSS should be identified and prioritized, for example, the causing factors in the most frequent failures in waterpipe network. Drinking water supply utilities are responsible for providing a safe and reliable supply of potable water to their customers. Risk priority helps asset manager to target and refine maintenance plans, capital expenditure plans, investigative activities, and deal with potential failure before it occurs. In this paper, we present a review of classic risk analyses, risk management and new methodology for water supply networks management. This paper presents a framework for the analysis of performance risk in water supply that can be applied to the entire system or to individual subsystems. It is expecting that the methodology for the water supply performance risk analysis would provide the city leadership for decision making support.
Źródło:
Journal of Polish Safety and Reliability Association; 2011, 2, 1; 185--196
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Quadrupole Interaction on $\text{}^{57}$Fe Mössbauer Spectra for Samples with Charge- and Spin-Density Waves
Autorzy:
Cieślak, J.
Dubiel, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/1964225.pdf
Data publikacji:
1997-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
75.30.Fv
75.50.Ee
Opis:
The influence of the quadrupole interaction on the shape of $\text{}^{57}$Fe Mössbauer spectra expected for samples with charge-density waves andor spindensity waves is investigated. It is shown, by model calculations, that both for the commensurate and for incommensurate charge-density waves andor spin-density waves the shape of $\text{}^{57}$Fe Mössbauer spectra is sensitive to the value, and for asymmetric spectra, to the sign of quadrupole interaction. This necessitates an inclusion of quadrupole interaction when analyzing the spectra recorded on samples exhibiting charge-density waves andor spin-density waves, and having a symmetry lower than cubic.
Źródło:
Acta Physica Polonica A; 1997, 91, 6; 1131-1139
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 53

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