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Wyświetlanie 1-15 z 193
Tytuł:
Some analytical properties of the multidimensional continuous Mróz model of plasticity
Autorzy:
Brokate, M.
Krejci, P.
Rachinskij, D.
Powiązania:
https://bibliotekanauki.pl/articles/206205.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
hartowanie kinetyczne
operator histerezowy
plastyczność
hysteresis operator
ill-posedness of Cauchy problem
kinematic hardening
Mróz model
plasticity
thermodynamic consistency
Opis:
We study the geometrical structure of memory induced by the continuous multidimensional Mróz model of plasticity. The results are used for proving the thermodynamic consistency of the model and composition and inversion formulas for input - memory state - output operators. We also show an example of nonuniqueness of solutions to a simple initial value problem involving the Mróz operator.
Źródło:
Control and Cybernetics; 1998, 27, 2; 199-215
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Underwater noise in Gdynia Harbour during piling
Autorzy:
Klusek, Z.
Kukliński, P.
Mróz, D.
Witalis, B.
Powiązania:
https://bibliotekanauki.pl/articles/985804.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
A short review of the results of noise investigation in Gdynia Harbour during pile driving at Hel Quay is presented. The spatial pattern of noise distribution and the recorded noise levels are compared with data regarding the potential impacts of noise on marine animals.
Źródło:
Hydroacoustics; 2014, 17; 105-114
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the stability of friction contact
Autorzy:
Mróz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/279760.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
contact friction
stability
static and dynamic modes
Opis:
The stability ocondition (1.2) for frictional contact expressed in terms of potential energy and the dissipation function is applied to analysis of the stability of rigid-sliding and elastic-sliding contacts obeying the Coulomb friction condition and the non-associated sliding rule. both static and dynamic modes are considered.
O stateczności kontaktu z tarciem Warunek (1.2) stateczności układu sprężystego z ciernym kontaktem wyrażony jest przez funkcję energii potencjalnej V(qi) i funkcję dysypacji D(qi, qk). Rozpatrzono prawo tarcia Coulomba i niestowarzyszone prawo poślizgu i zastosowano warunek stateczności do kontaktu sztywnego i z podatnością sprężystą. Określono statyczne i dynamiczne formy utraty stateczności.
Źródło:
Journal of Theoretical and Applied Mechanics; 2000, 38, 2; 315-329
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Branding and rebranding – grocery market perspective
Branding i rebranding na przykładzie rynku spożywczego
Autorzy:
Mroz-Gorgon, B.
Powiązania:
https://bibliotekanauki.pl/articles/37505.pdf
Data publikacji:
2016
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Acta Scientiarum Polonorum. Oeconomia; 2016, 15, 4
1644-0757
Pojawia się w:
Acta Scientiarum Polonorum. Oeconomia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated gas chromatograph
Autorzy:
Dziuban, J. A.
Mróz, J.
Koszur, J.
Powiązania:
https://bibliotekanauki.pl/articles/308982.pdf
Data publikacji:
2005
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
portable gas chromatograph
integrated injectors
silicon micromechanics
Opis:
A portable gas chromatograph with integrated micromachined flushed injector and thermal mass detector (TCD) has been developed. The silicon/glass injector operates in a fixed volume (2×7 žL) or electronically operated mode. An integrated, pneumatically operated, fast cross-valve is applied in the injector. The TCD detector consists of two Pt microheaters and thermoresistors packaged in a silicon/glass micromachined chip. The temperature of two capillary molecular sieve separation columns is controlled by a thick-film heater fabricated on polyimide foil. The chromatograph is equipped with two 16-bits microprocessors communicating with the external portable PC. The instrument may operate in the on-line continuous analysis mode.
Źródło:
Journal of Telecommunications and Information Technology; 2005, 1; 20-23
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Problems in Quantitative Auger Analysis of Metallic Alloys
Autorzy:
Mróz, S.
Doliński, W.
Powiązania:
https://bibliotekanauki.pl/articles/1892438.pdf
Data publikacji:
1992-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.20.Fv
68.35.Dv
Opis:
Factors determining the Auger signal intensity are discussed. It is indicated that using standards is the only reasonable way for quantitative Auger analysis (QAA). Approaches to QAA without and with matrix corrections are presented. It is shown that the matrix correction connected with atomic concentrations of pure standards is the most important and that the other matrix corrections (e.g. those connected with the attenuation length and backscattering factor) do not improve appreciably the QAA exactness in many examples taken from the literature. The examples indicate that in the case of metallic alloys the properly performed QAA gives the relative atomic concentrations with the error not exceeding few percent.
Źródło:
Acta Physica Polonica A; 1992, 81, 2; 201-210
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coal mine gas from abandoned mines
Autorzy:
Backhaus, C.
Mroz, A.
Willenbrink, B.
Powiązania:
https://bibliotekanauki.pl/articles/1204913.pdf
Data publikacji:
2002
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
coal gas mine
sucking stations
utilization
Germany
Opis:
Coal mine gas usually consists of methane, nitrogen and carbon dioxide. Its appearance is a constant and well-documented concomitant of coal-mining. In the Ruhr Basin, Germany, after the shut-down of the mines, up to 1,000 cubic metres per hour of coal mine gas continue to escape from the pits and get into the atmosphere through special degassing systems. A not insignificant part of coal mine gas migrates in addition diffuse at the surface. Thus, a natural energy carrier is given up for lost. To make matters worse, the methane component of the coal mine gas could form an explosive mixture with air and it is ecologically harmful since it significantly contributes to the greenhouse effect: It is estimated that methane is approximately 21 times more harmful then carbon dioxide. Since 1994, engineers of the Fraunhofer Institute for Environmental, Safety, and Energy Technology in Oberhausen, Germany, have been working on new concepts regarding:o the deliberate migrations of coal mine gas also effectively minimises potential dangers resulting from its uncontrolled emission, accumulation and forming explosive mixtures with air; o the energetic utilisation of coal mine gas from abandoned mines in CHP units (Combined Heat and Power Generation).Since 1998 UMSICHT operates several sucking-stations the danger defence and for potential inquiry of coal mine gas from abandoned mines. Therefore coal gas is sucked off of boreholes in the surface area (depth < 50 m) and boreholes into old workings of the abandoned mines. A result of the different sucking tests is the minimisation of the diffuse gas migrations. By the direct sucking of the old pit a substantially bigger area could be hold gas free than by sucking off surface boreholes. The sucking off of abandoned coal mines has resulted an increase of the CH4-concentration from 40% to more than 70% over the testing time independent of the atmospheric conditions. During the time of sucking (more than 3 month) an influence to the pressure in the abandoned mine could not verified. Water ring pumps and roots-compressors in different kinds of operating are tested in the sucking-stations.Coal mine gas is estimated to be available for a long time. An economic utilisation seems to be possible within the next decades. The gas deposit within the coal mines of North-Rhine Westphalia is enormous: It is considered to amount to approximately 120 million tons of methane per year, most of it energetically utilisable. The utilization of coal mine gas is one way to reach the aims of the Kyoto-Conference. Therefore the energy generation with coal mine gas is supported in Germany by a guaranteed price for the produced electrical energy since 2000. Because of the decreasing coal-prices in many countries a lot of mines were abandoned in the last years. Dezentralizied CHP-concepts created by UMSICHT are one way for an effective and quick solution of the problems of these mines.
Źródło:
Polish Geological Institute Special Papers; 2002, 7; 33-40
1507-9791
Pojawia się w:
Polish Geological Institute Special Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Personality traits and two dimensions of forgivingness
Autorzy:
Kaleta, Kinga
Mróz, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/2126601.pdf
Data publikacji:
2019-04-08
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
personality
five-factor model
forgivingness
forgiveness
overcoming unforgiveness
Opis:
Although personality characteristics have been conceptualized as influencing individuals’ propensity to forgive, the findings in this field are inconsistent and require further studies. The five-factor model has been explored most frequently, and personality traits, especially agreeableness and neuroticism, have been found to be related to forgiveness. This study investigated the relationships between five personality domains and different aspects of dispositional forgiveness, termed forgivingness, namely positive and negative dimensions of forgivingness of oneself, other people, and situations beyond anyone’s control. Data were collected from 153 adults aged from 20 to 55 years. The participants completed the NEO-FFI Personality Inventory and the Heartland Forgiveness Scale (HFS). Correlation and regression analyses were performed. The results demonstrated that personality traits explained variance in most HFS subscales. Neuroticism, agreeableness and extraversion were significant predictors of different dimensions of forgivingness. Neuroticism negatively predicted the overall level of forgivingness and overcoming unforgiveness of self, others, and situations. Extraversion along with neuroticism also negatively predicted total forgivingness as well as overcoming unforgiveness in general and towards others. Agreeableness was significantly related to positive forgivingness in general and towards others.
Źródło:
Roczniki Psychologiczne; 2018, 21, 2; 147-162
1507-7888
Pojawia się w:
Roczniki Psychologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chitosan applied for gypsum modification
Autorzy:
Mucha, Maria
Mróz, Patrycja
Wrona, Dominika
Powiązania:
https://bibliotekanauki.pl/articles/1034560.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan/PVA
gypsum
mechanical properties
morphology
setting time
Opis:
In order to improve the properties of gypsum materials, including workability, mechanical strength and ability to retain water, various admixtures (also polymers), known as plasticisers, have been applied. These polymers can be soluble in water, such as cellulose and starch ethers, or unsoluble applied in a form of dispersion up to 5% of weight fraction. The admixtures are added into initial water and mixed with hemihydrate calcium sulphate in a proper ratio. In the hydration process of the hemihydrate into dehydrate, a crystallisation process leading to gypsum setting occurs. In the present work, a chitosan sample of DD=85% in two forms was applied: dissolved in 1% acetic acid and as a water dispersion in the weight fraction up to 1% of the gypsum matrix. The water to gypsum ratios of 0.6 or 0.74 was applied. The influence of chitosan on the rate of setting and kinetics of crystallisation of gypsum was investigated and discussed. The morphological structure of the resulting gypsum sample was examined using SEM microscopy. In the presented results, chitosan in the form of a 1% dispersion was a setting retardant and it changed the morphological structure of gypsum. However, mechanical tests showed a decrease of bending strength. When chitosan was applied as a biomaterial, the chitosan content in the composite was equal to 10%, and thus a compressing strength increased. The presence of PVA (polyvinyl alcohol) in the gypsum matrix caused a small effect on gypsum setting in contrast to PVAc (polyvinyl acetate), which is a good admixture for both cement and gypsum [2,3].
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2017, 22; 166-175
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of biogas utilization — realization smart community idea
Autorzy:
Grządzielski, W.
Mróz, T.
Radomski, B.
Powiązania:
https://bibliotekanauki.pl/articles/175584.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
biogas utilization
smart communities
energy planning
Opis:
The paper presents an analysis of the possibilities of using biogas in energy management of the cities and communities, including the purification of biogas excess to balance the unevenness in demand and supply side of biogas market (operating agricultural biogas plant). The case study describes the four technical acceptable scenarios of using agricultural biogas: variant I – combined heat and power production, variant II – supply of the local heat source, variant III – supply of the local heat source and the use of treated biogas (biomethane) in the local urban transport and variant IV – combined heat and power production and injection of conditioned biogas (biomethane) into the gas distribution grid. The identified variants were evaluated using the analytic hierarchy process multicriteria decision aid method in which the main evaluation criteria were technical, economic, social and environmental, as well as risk criterion. The results of the analysis indicate the possibility of rational use of excess biogas production by: treatment and use of liquefied biomethane for energy production or transport, or combined heat and power production, or use of biomethane injected into the distribution gas network, which can be the basis for the implementation of smart city and community strategy.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2017, 137; 41-58
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Directional Auger Electron Spectroscopy - Possibilities, Limitations and Proposal of Improvements
Autorzy:
Mróz, S.
Rok, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/1811503.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.J-
68.35.Rh
Opis:
Physical foundations of directional auger electron spectroscopy (DAES) and calculation of DAES profiles in single scattering cluster approach are presented. Limitations of this method (application only to investigation of the crystalline structure of homogeneous samples) is shown and explained as the result of participation of inelastically scattered electrons in the Auger signal generation. To extend the DAES application for the interface structure, the use of as low as possible energy of primary electrons is proposed because in such a case the participation of inelastically scattered electrons becomes negligible and single scattering cluster calculation should describe correctly the DAES profiles for interfaces. Besides, the extension of single scattering cluster calculations to the second elastic scattering is recommended. To check the technical possibility of DAES use in the proposed version, the Auger spectrum of Cu LMM peaks was recorded for a $Cu_3Au$(001) sample with the use of a retarding field analyzer with the primary beam energy 1200 eV. Quality of this spectrum seems to be good enough for using in DAES.
Źródło:
Acta Physica Polonica A; 2008, 114, S; S-93-S-101
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and design of thermo-mechanical interfaces
Autorzy:
Dems, K.
Mroz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/202338.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multiphase structures
sensitivity analysis
optimization
heat transfer
thermo-elasticity
Opis:
An elastic structure subjected to thermal and mechanical loading with prescribed external boundary and varying internal interface is considered. The different thermal and mechanical nature of this interface is discussed, since the interface form and its properties affect strongly the structural response. The first-order sensitivities of an arbitrary thermal and mechanical behavioral functional with respect to shape and material properties of the interface are derived using the direct or adjoint approaches. Next the relevant optimality conditions are formulated. Some examples illustrate the applicability of proposed approach to control the structural response due to applied thermal and mechanical loads.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 2; 205-213
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Pyroelectric Properties of the TGS-TGSe Crystals with Internal Electric Field
Autorzy:
Dziedzic, J.
Mróz, J.
Powiązania:
https://bibliotekanauki.pl/articles/2044565.pdf
Data publikacji:
2005-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
Opis:
Measurements of spontaneous polarization and pyroelectric coefficient versus temperature and electric field were performed for the TGS-TGSe crystals at a definite internal electric field. The obtained results are compared with the thermodynamic theory predictions. The temperature and electric field dependencies of pyroelectric coefficient are presented together with its maximal value as a function of the electric field intensity. It was shown that the temperature, at which the pyroelectric coefficient reaches its maximal value, depends on the external electric field.
Źródło:
Acta Physica Polonica A; 2005, 108, 6; 971-978
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anomalous Non-linear Dielectric Behaviour of LATGS Crystals
Autorzy:
Cach, R.
Mróz, J.
Haden, D.
Powiązania:
https://bibliotekanauki.pl/articles/1887846.pdf
Data publikacji:
1991-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
77.20.+y
Opis:
The dielectric permittivity in a biasing electric field and also the spontaneous polarization of LATGS crystals are measured near the ferroelectric phase transition. It is demonstrated that L-alanine admixtures change the parameters of dielectric state equation. It is shown that the bias field value decreases while approaching the phase transition temperature from the para-electric phase. The effective non-linearity coefficient B, near Tc, depends on electric field direction. This anomalous non-linear behaviour can be explained assuming asymmetric bias field dependence on external electric field.
Źródło:
Acta Physica Polonica A; 1991, 79, 6; 905-914
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 193

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