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Wyświetlanie 1-15 z 72
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:
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:
Cognitive and emotional predictors of episodic and dispositional forgiveness
Autorzy:
Mróz, Justyna
Kaleta, Kinga
Powiązania:
https://bibliotekanauki.pl/articles/2128356.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
emotional control
positive orientation
forgiveness
basic hope
affectivity
Opis:
The study examined the importance of cognitive (positive orientation, basic hope) and emotional (positive and negative affectivity, emotional control) variables for state and trait forgiveness. One hundred and thirty nine participants completed six inventories in Polish version: HFS (Thompson et al., 2005), TRIM (McCullough et al., 1998), P-Scale (Caprara et al., 2012), BHI-12 (Trzebiński & Zięba, 2003a), SUPIN (Polish version of PANAS; Watson, Clark, & Tellegen, 1988), CECS (Watson & Greer, 1983). Results showed that dispositional forgiveness (general and positive) was associated with cognitive and emotional predictors, whereas episodic forgiveness primarily with certain emotional variables. In addition, the results indicated that emotional predictors merely participate in the process of reducing unforgiveness, whereas cognitive and emotional variables were shown to be necessary for full forgiveness.
Źródło:
Polish Psychological Bulletin; 2017, 2; 143-153
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Groove Rolling Process of Mg/Al Bimetallic Bars
Autorzy:
Mróz, S.
Stefanik, A.
Szota, P.
Powiązania:
https://bibliotekanauki.pl/articles/353827.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bimetallic bars
Mg alloy
groove rolling
multi-radial passes
Opis:
The paper presents the results of the experimental tests of Mg/Al bimetallic bars rolling process in classic and multi-radial modified round-oval-round passes. The bimetallic bar consist of magnesium core, grade AZ31 and aluminium outer layer, grade 1050A. The stocks were round bars with diameter 22.5 mm with an aluminium layer share of 28%. As a result of rolling in four passes, bars of a diameter of about 17 mm were obtained. A bimetallic feedstock was manufactured using an explosive welding method. The use of the designed arrangement of multi-radial modified stretching passes resulted in obtaining Mg/Al bimetallic bars with an uniform distribution of the cladding layer over the bar perimeter and high quality of shear strength between individual layers compared to Mg/Al bars obtained in the classic passes.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 1067-1072
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioactivity of cement type bone substitutes
Autorzy:
Siek, D.
Czechowska, J.
Mróz, W.
Zima, A.
Burdyńska, S.
Załęczny, R.
Ślósarczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/200610.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bone implants
bioactivity
surface morphology
Opis:
In vitro chemical stability and bioactivity of three different cement type bone substitutes were determined by incubating cement samples in the simulated body fluid (SBF) for 7 and 28 days. Morphology of sample surfaces has been studied using scanning electron microscopy (SEM) combined with an energy dispersive X-ray spectroscopy (EDS) and by atomic force microscopy (AFM). The diffuse reflectance Fourier-transform infrared spectroscopy (DRIFTS) was applied as a supplementary method. The development of bone-like apatite layers on the surface depended on their initial phase composition. Obtained cements showed good surgical handiness, high bioactive potential and were chemically stable. They seem to be promising materials for bone substitution.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 433-439
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Coefficients of the GTAW Process
Autorzy:
Orłowicz, A. W.
Trytek, A.
Tupaj, M.
Mróz, M.
Powiązania:
https://bibliotekanauki.pl/articles/383027.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal efficiency
remelting process
flow calorimeter
sprawność cieplna
przetapianie
kalorymetr przepływowy
Opis:
The paper presents a discussion on the issue of thermal efficiency of the process of superficial remelting of castings by means of the gas tungsten arc welding (GTAW) process. Described and characterized are calorimeters used in research studies on efficiency of welding processes and the obtained results. Example results are presented from the measurements aimed at determination of thermal efficiency of the welding process carried out with the use of the flow calorimeter.
Źródło:
Archives of Foundry Engineering; 2015, 15, 3 spec.; 63-68
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Materials Used in the Automotive Industry
Autorzy:
Orłowicz, A. W.
Mróz, M.
Tupaj, M.
Trytek, A.
Powiązania:
https://bibliotekanauki.pl/articles/383174.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
automotive industry
foundry material
casting technique
przemysł motoryzacyjny
materiał odlewniczy
technika odlewnicza
Opis:
Elaborated shapes of many car components are the reason for which the use of casting techniques to fabricate them is a solution wellfounded from the economical point of view. Currently applicable regulatory requirements concerning emissions of exhaust fumes force the carmakers to reduce the overall weight of their products, as this is a basic precondition for reducing fuel consumption. As a result, newly launched car models contain a continuously increasing share of thin-walled castings made of materials which ensure a satisfactory level of service properties. At the same time, developing new technological processes allowing to extend the service life of individual components by means of surface improving becomes more and more important.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2; 75-78
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Importance of advanced planning of manufacturing for nuclear industry
Autorzy:
Shykinov, N.
Rulko, R.
Mroz, D.
Powiązania:
https://bibliotekanauki.pl/articles/407173.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
component
construction
licensing
long-lead
nuclear
compliance
safety
regulation
procurement
design
standards
Opis:
In the context of energy demands by growing economies, climate changes, fossil fuel pricing volatility, and improved safety and performance of nuclear power plants, many countries express interest in expanding or acquiring nuclear power capacity. In the light of the increased interest in expanding nuclear power the supply chain for nuclear power projects has received more attention in recent years. The importance of the advanced planning of procurement and manufacturing of components of nuclear facilities is critical for these projects. Many of these components are often referred to as long-lead items. They may be equipment, products and systems that are identified to have a delivery time long enough to affect directly the overall timing of a project. In order to avoid negatively affecting the project schedule, these items may need to be sourced out or manufactured years before the beginning of the project. For nuclear facilities, long-lead items include physical components such as large pressure vessels, instrumentation and controls. They may also mean programs and management systems important to the safety of the facility. Authorized nuclear operator training, site evaluation programs, and procurement are some of the examples. The nuclear power industry must often meet very demanding construction and commissioning timelines, and proper advanced planning of the long-lead items helps manage risks to project completion time. For nuclear components there are regulatory and licensing considerations that need to be considered. A national nuclear regulator must be involved early to ensure the components will meet the national legal regulatory requirements. This paper will discuss timing considerations to address the regulatory compliance of nuclear long-lead items.
Źródło:
Management and Production Engineering Review; 2016, 7, 2; 42-49
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The model of double-cage induction motor for the analysis of thermal fields in transient operations
Autorzy:
Mróz, J.
Powiązania:
https://bibliotekanauki.pl/articles/141544.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AC motors
heating
induction motors
squirrel cage motors
temperature rise
Opis:
Emergency motor switch-on happens occasionally while operating a doublesquirrel- cage motor at full supply voltage with the rotor blocked (e.g., in coal mills). After releasing the blockage, the by now heated motor is started up again. However, the mechanical stress caused by the increased temperature poses considerable hazards to the squirrel-cage winding. This paper presents a double-cage induction motor model for analysis of thermal fields in transient operation. The thermal field for the rotor of a doublesquirrel- cage motor of soldered or cast structure, operating in the conditions described, has been calculated in the present paper using a thermal network method. Measurement results have been presented for the double-squirrel-cage winding temperature for a soldered cage construction in the blocked rotor state.
Źródło:
Archives of Electrical Engineering; 2017, 66, 2; 397-408
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical and Experimental Analysis of Mg/Al Bimetallic Handle Forging Process
Autorzy:
Szota, P.
Mróz, S.
Gontarz, A.
Stefanik, A.
Powiązania:
https://bibliotekanauki.pl/articles/355618.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Mg/Al bimetallic forging
die forging
numerical modelling
FEM
Opis:
The present paper reports the results of theoretical and experimental studies of the process of die forging a bimetallic door handle intended for the production of a helicopter. The aim of the studies was to develop and implement a technology for die forging of a product with a specific mass similar to that of magnesium alloys which will have, however higher corrosion resistance. Numerical modelling and industrial tests were carried out based on the previously forging processes for an AZ31 alloy door handle. The material for the tests was a bimetallic bar produced by the explosive welding method, in which the core was of alloy AZ31, and the cladding layer was made of 1050A grade aluminium. The studies were conducted for two variants: Variant I – the forging process was mapped by numerical modelling and industrial tests for the die shape and parameters used in the forging of the AZ31alloy door handle, Variant II – the tool shape was optimized and process parameters were selected so as to obtain a finished product characterized by a continuous Al layer. From the theoretical studies and experimental tests carried out it has been found that the application of the Variant I does not assure that a finished door handle characterized by a continuous cladding layer will be produced. Within this study, a novel method of bimetallic door handle die forging (Variant II) has been developed, which limits the amount of the flash formed and assures the integrity of the cladding layer.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1503-1512
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing Of energy meters under three-phase determined and random nonsinusoidal conditions
Autorzy:
Olencki, A.
Mróz, P.
Powiązania:
https://bibliotekanauki.pl/articles/221328.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
energy meter testing
nonsinusoidal conditions
energy calibrators
electrical power standards
automatic calibration procedure
Opis:
Electric energy meters are designed to account energy under sinusoidal and nonsinusoidal conditions, because both, old and new standards for energy meters require testing their accuracy under different conditions. The latest EN 50470 standard increases the range of meter testing under nonsinusoidal conditions, introducing new shapes of test signals such as the phase fired waveform or the burst fired waveform. This paper discusses calibration problems of electronic revenue energy meters for direct connection and for connection through current transformers, and it proposes a new calibration procedure which reproduces normal operating conditions better: three-phase configurations of measurement systems, load range during meter testing or shapes of test signals. Recently, modern Electrical Power Standards, also known as Power Calibrators, enable automatic testing of various types of electrical devices, including electricity meters in their normal operating conditions. This article presents examples of single and multi position fully automatic test systems, which employ Power/Energy Calibrator from Poland as the precision source with programmed waveforms of three phase voltages up to 560 V and currents up to 120 A conforming to EN 50470, or with random waveforms generated by PC software random wave generator. Measurement uncertainty of the energy meters under different nonsinusoidal conditions using a test system with reference to accuracy of the power calibrator or to the reference meter, are discussed. Comparative analysis of test results for different shapes of voltage and current signals is presented in the conclusions of this paper.
Źródło:
Metrology and Measurement Systems; 2014, 21, 2; 217-232
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increasing the Durability of Separating Rolls During Rolling Ribbed Bars in the Three-Strand Technology
Autorzy:
Strycharska, D.
Szota, P.
Mróz, S.
Powiązania:
https://bibliotekanauki.pl/articles/356549.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ribbed bar
slitting passes
wear
numerical modeling
FEM
Opis:
The paper presents the results of investigations aimed at enhancing the durability of slitting passes in the process of three-strand rolling of 16 mm-diameter ribbed bars. Using the Forge2011® computer program, numerical modelling of the rolling process was carried out in order to examine the variations in band shape in individual rolling passes, to verify the correctness of the designed new slitting pass system, to determine the local strains in the rolled band, and then to determine the distribution of unit friction force work on the roll groove surface. From the obtained investigation results it was found that the application of the new roll pass design in stands 13-16 increased their durability in the rolling process by approx. 30%. The wear of the roll sets for the stands under examination after rolling out the annual 16 mm-diameter bar production volume was determined in the study. The obtained numerical modelling results were verified in experimental tests.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1535-1540
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pursuing Listeners’ Perceptual Response in Audio-Visual Interactions – Headphones vs Loudspeakers: A Case Study
Autorzy:
Mróz, Bartłomiej
Kostek, Bożena
Powiązania:
https://bibliotekanauki.pl/articles/2141690.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
human perception
audio-visual interaction
3D perception
binaural spatial audio
Opis:
This study investigates listeners’ perceptual responses in audio-visual interactions concerning binaural spatial audio. Audio stimuli are coupled with or without visual cues to the listeners. The subjective test participants are tasked to indicate the direction of the incoming sound while listening to the audio stimulus via loudspeakers or headphones with the head-related transfer function (HRTF) plugin. First, the methodology assumptions and the experimental setup are described to the participants. Then, the results are presented and analysed using statistical methods. The results indicate that the headphone trials showed much higher perceptual ambiguity for the listeners than when the sound is delivered via loudspeakers. The influence of the visual modality dominates the audio-visual evaluation when loudspeaker playback is employed. Moreover, when the visual stimulus is present, the headphone playback pattern of behavior is not always in response to the loudspeaker playback.
Źródło:
Archives of Acoustics; 2022, 47, 1; 71-79
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 72

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