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Wyświetlanie 1-15 z 23
Tytuł:
Finite element study on thermal buckling of functionally graded piezoelectric beams considering inverse effects
Autorzy:
Nasirzadeh, R.
Behjat, B.
Kharazi, M.
Powiązania:
https://bibliotekanauki.pl/articles/280342.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
FGPM beam
buckling load
inverse piezoelectric effect
thermal environment
Opis:
In this article, the buckling behavior and bifurcation point of Functionally Graded Piezoelectric (FGP) beams are investigated based on Euler-Bernoulli beam theory. The finite element method is employed to model the beam in thermal environment. The material properties of the beam are considered to vary gradually in the thickness direction and the beam is subjected to electrical and thermal loading. In this paper, direct and inverse piezoelectric effects are considered and buckling of the beam in the sensor state is investigated. By solving the eigenvalue problem, the buckling load of the FGP beam is obtained and the effect of various parameters such as power law index, temperature, applied voltage and beam aspect ratio on the buckling load are investigated. The results show that the boundary conditions are the main factor that affects the buckling load of the FGP beam.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 1097-1108
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study of Computer-Based Task Performance Under Thermal Stress
Autorzy:
Chase, B.
Karwowski, W.
Benedict, M. E.
Quesada, P. M.
Irwin-Chase, H. M.
Powiązania:
https://bibliotekanauki.pl/articles/90836.pdf
Data publikacji:
2003
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
dual task
thermal environment
cognitive performance
środowisko pracy
obciążenie cieplne
aklimatyzacja w wysokiej temperaturze
mikroklimat
Opis:
A visual-visual dual computer task was designed to test the effect of the thermal environment on dual task performance. The temperatures selected for testing were 20 and 35 °C Wet Bulb Globe Temperature (WBGT). 34 volunteers were randomly assigned to 1 of the 2 temperature conditions. Individual differences in single task performance were controlled by equating the baselines of single task performance. Once individual differences in single task capacity were con-trolled, statistically significant differences in performance were demonstrated. Mean Accuracy was computed over a 1-hr testing period in each temperature condition. Participants’ mean accuracy in the 35° condition (38.18%) was substantially lower than in the 20° condition (50.88%).
Źródło:
International Journal of Occupational Safety and Ergonomics; 2003, 9, 1; 5-15
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluating the impact of expansion on urban thermal surroundings: A case study of Lahore Metropolitan city, Pakistan
Autorzy:
Khan, U.A.
Powiązania:
https://bibliotekanauki.pl/articles/2049676.pdf
Data publikacji:
2020
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
land cover
land use
urban sprawl
thermal environment
landscape change
surface temperature
spectral radiance measurement
Pakistan
Landscape Changes
LULC
LST
Opis:
Urbanization directly affects the existing infrastructure, landscape modification, environmental contamination and traffic pollution especially if there is lack of urban planning. Recently, the rapid urban sprawl has resulted in less developed green areas and has devastating environmental consequences. This study was aimed to study the past urban expansion rates and Measure LST from satellite data. The Land use land cover (LULC) maps of years 1996, 2010, 2013, and 2017 were generated using Landsat satellite images. Four main classes i.e. water, urban, bare land and vegetation were identified using unsupervised classification with iterative self-organizing data analysis (isodata) technique. The LST from satellite thermal data can be derived from different procedures:atmospheric, radiometric calibrations and surface emissivity corrections, classification of spatial changeability in land-cover. Different methods and formulas were used in the algorithm that successfully retrieves the land surface temperature to help us study the thermal environment of the ground surface. To verify the algorithm, the land surface temperature and the near-air temperature were compared. The results showed that, From 1996-2017 urban areas increased to about considerable increase of about 48%.few areas of city also shown in reduction in LST from year 1996-2017that actually began their transitional phase from rural to urban LULC.Mean temperature of city increased averagely about 1ºC each year in the month of October. The green and vegetative areas witnessed a decrease in area while higher number of pixels increased in urban class.
Źródło:
Environment, Earth and Ecology; 2020, 4, 1; 38-49
2543-9774
2451-4225
Pojawia się w:
Environment, Earth and Ecology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of thermal environment indices and air quality inside a wooden historic church in Wisniowa
Autorzy:
Sadlowska, A.
Bieda, W.
Powiązania:
https://bibliotekanauki.pl/articles/59927.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
thermal environment index
air quality
indoor air
indoor thermal comfort
Wisniowa village
church
wooden church
historical church
air parameter
annual measurement
historical building
hygienic standard
local material culture
Opis:
The paper presents a computational analysis of the PMV, PPD and PD thermal environment indices for indoor air quality (IAQ) inside a historic wooden church in the village of Wiśniowa. The study is based on annual measurements of indoor air parameters as well as data on the number of Sunday Mass attendees and indoor air quality. As the results point out, indoor thermal comfort during the majority of Sunday Masses, both in summer and winter, remains within category C while the indoor air quality, assessed by means of PD index, levelled at 100%, irrespective of time of year. The improvement of inside air comfort and hygienic standards is possible by means of installing an effective mechanical ventilation system adapted for use in a historic building of high value in terms of local material culture.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2010, 11
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Thermal Comfort in the Intelligent Building in Winter Conditions
Autorzy:
Orman, Łukasz J.
Honus, Stanislav
Jastrzębska, Paulina
Powiązania:
https://bibliotekanauki.pl/articles/27315744.pdf
Data publikacji:
2023
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
indoor environment
intelligent building
thermal comfort
Opis:
The paper analyses thermal sensations, preferences and acceptability as well as humidity sensations of students in the intelligent building "Energis" of the Kielce University of Technology (Poland). The tests were performed in 8 lecture rooms, during which the volunteers filled in the anonymous questionnaires (with 3 to 7 possible answers for each question) and – simultaneously – physical air parameters were measured with Testo 400 microclimate meter. The study aimed to determine if the intelligent building provides proper indoor environment conditions during the heating season and to assess the accuracy of the standard methodology for thermal comfort determination. Experimental analysis of thermal and humidity sensations revealed that a share of the respondents critically assessed the indoor environment: 17% regarding temperature and 30% regarding humidity. Moreover, the standard methodology for thermal comfort calculations proved overwhelmingly inaccurate compared to the experimental data (with the results for 6 rooms being beyond the 50% error range). Since smart buildings are still not very common in Central Europe, the experimental data obtained in the study can be valuable both from the scientific but also practical point of view – providing useful data for building engineers and designers.
Źródło:
Rocznik Ochrona Środowiska; 2023, 25; 45--54
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Validation of the Fanger Model and Assessment of SBS Symptoms in the Lecture Room
Autorzy:
Krawczyk, Natalia
Dębska, Luiza
Piotrowski, Jerzy Zbigniew
Honus, Stanislav
Majewski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/27315747.pdf
Data publikacji:
2023
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
indoor environment
sick building syndrome
thermal comfort
Opis:
The indoor environment of buildings significantly affects the well-being and health of room users. Experiencing thermal discomfort reduces concentration and productivity during study or work, causing drowsiness, fatigue or deterioration in general well-being. The study focuses on presenting the results of the questionnaire study on the symptoms of sick building syndromes (SBS), namely: dizziness, nausea, eye pain and nasal mucosa, experienced by 69 students during a lecture in a large and modern auditorium of Kielce University of Technology. The results show that many students experienced SBS symptoms, which seem to have affected their concentration during the class. The article also discusses the thermal sensations of the students with a focus on comparing the obtained results with the Fanger model of thermal comfort. The discrepancy between the model calculation results and the experimental data has been observed and discussed.
Źródło:
Rocznik Ochrona Środowiska; 2023, 25; 68--76
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient quantification of free and forced convection via the decoupling of thermo-mechanical and thermo-fluidic simulations of machine tools
Autorzy:
Glaenzel, J.
Ihlenfeldt, S.
Naumann, C.
Putz, M.
Powiązania:
https://bibliotekanauki.pl/articles/100153.pdf
Data publikacji:
2018
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
thermal effects
simulation
machine tool
environment
positioning error
Opis:
Thermo-elastic deformations represent one of the main reasons for positioning errors in machine tools. Investigations of the thermo-mechanical behaviour of machine tools, especially during the design phase, rely mainly on thermo-elastic simulations. These require the knowledge of heat sources and sinks and assumptions on the heat dissipation via convection, conduction and radiation. Forced convection such as that caused by moving assemblies has both a large influence on the heat dissipation to the surrounding air. The most accurate way of taking convection into account is via computational fluid dynamics (CFD) simulations. These simulations compute heat transfer coefficients for every finite element on the machine tool surface, which can then be used as boundary conditions for accurate thermo-mechanical simulations. Transient thermo-mechanical simulations with moving assemblies thus require a CFD simulation during each time step, which is very time-consuming. This paper presents an alternative by using characteristic diagrams to interpolate the CFD simulations. The new method uses precomputed thermal coefficients of a small number of load cases as support points to estimate the convection of all relevant load cases (i.e. ambient conditions). It will be explained and demonstrated on a machine tool column.
Źródło:
Journal of Machine Engineering; 2018, 18, 2; 41-53
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parallel computing in automation of decoupled fluid-thermostructural simulation approach
Autorzy:
Glänzel, Janine
Naumann, Andreas
Kumar, Tharun Suresh
Powiązania:
https://bibliotekanauki.pl/articles/100135.pdf
Data publikacji:
2020
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
thermal effects
simulation
machine tool
environment
positioning error
Opis:
Decoupling approach presents a novel solution/alternative to the highly time-consuming fluid-thermal-structural simulation procedures when thermal effects and resultant displacements on machine tools are analyzed. Using high dimensional Characteristic Diagrams (CDs) along with a Clustering Algorithm that immensely reduces the data needed for training, a limited number of CFD simulations can suffice in effectively decoupling fluid and thermal-structural simulations. This approach becomes highly significant when complex geometries or dynamic components are considered. However, there is still scope for improvement in the reduction of time needed to train CDs. Parallel computation can be effectively utilized in decoupling approach in simultaneous execution of (i) CFD simulations and data export, and (ii) Clustering technique involving Genetic Algorithm and Radial Basis Function interpolation, which clusters and optimizes the training data for CDs. Parallelization reduces the entire computation duration from several days to a few hours and thereby, improving the efficiency and ease-of-use of decoupling simulation approach.
Źródło:
Journal of Machine Engineering; 2020, 20, 2; 39-52
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parameterization of environmental influences by automated characteristic diagrams for the decoupled fluid and structural-mechanical simulations
Autorzy:
Glänzel, Janine
Kumar, Tharun Suresh
Naumann, Christian
Putz, Matthias
Powiązania:
https://bibliotekanauki.pl/articles/99399.pdf
Data publikacji:
2019
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
thermal effects
simulation
machine tool
environment
positioning error
Opis:
Thermo-elastic effects contribute the most to positioning errors in machine tools especially in operations where high precision machining is involved. When a machine tool is subjected to changes in environmental influences such as ambient air temperature, velocity or direction, then flow (CFD) simulations are necessary to effectively quantify the thermal behaviour between the machine tool surface and the surrounding air (fluid). Heat transfer coefficient (HTC) values effectively represent this solid-fluid heat transfer and it serves as the boundary data for thermo-elastic simulations. Thereby, deformation results can be obtained. This two-step simulation procedure involving fluid and thermo-structural simulations is highly complex and time-consuming. A suitable alternative for the above process can be obtained by introducing a clustering algorithm (CA) and characteristic diagrams (CDs) in the workflow. CDs are continuous maps of a set of input variables onto a single output variable, which are trained using data from a limited number of CFD simulations which is optimized using the clustering technique involving genetic algorithm (GA) and radial basis function (RBF) interpolation. The parameterized environmental influences are mapped directly onto corresponding HTC values in each CD. Thus, CDs serve as look-up tables which provide boundary data (HTC values along with nodal information) under several load cases (combinations of environmental influences) for thermo-elastic simulations. Ultimately, a decoupled fluid-structural simulation system is obtained where boundary (convection) data for thermo-mechanical simulations can be directly obtained from CDs and would no longer require fluid simulations to be carried out again. Thus, a novel approach for the correction of thermo-elastic deformations on a machine tool is obtained.
Źródło:
Journal of Machine Engineering; 2019, 19, 1; 98-113
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining of a passenger car fire temperature
Autorzy:
Szajewska, A.
Świder, R.
Rybiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/114316.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
emissivity
thermal camera
thermogram
fireman
fire environment
firefighting
Opis:
A fire test was carried out. In the test a lift back passenger car with LPG system was burnt. Fire footprints, visible only in IR were observed with a thermal camera. Temperature was measured at specific points of the car and results were presented in graphs. Comparative measurements of surface temperature were taken by a thermocouple and thermal camera. Value of emissivity coefficient was delimited using ThermaCAM Researcher programme, by Flir Co.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 275-277
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The proposal of evaluation of selected thermal-degradation and environmental characteristics of wood modified treatment. Part 1: Determination of selected thermal-degradation characteristics
Propozycja oceny degradacji termicznej i oceny środowiskowej. Część 1. Ocena charakterystyki degradacji termicznej
Autorzy:
Ruzinska, E.
Mitterova, I.
Jablonski, M
Powiązania:
https://bibliotekanauki.pl/articles/8721.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
environment degradation
thermal degradation
wood
surface
treatment
risk substance
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2014, 87
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal maturity and depositional environments of organic matter in the post-Variscan succession of the Holy Cross Mountains
Autorzy:
Marynowski, L.
Salamon, R.
Narkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2059919.pdf
Data publikacji:
2002
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Holy Cross Mountains
Permian
Triassic
biomarkers
depositional environment
thermal maturity
Opis:
The results of GC-MS investigations of biomarkers in organic matter from the epicontinental Permian and Triassic strata of the Holy Cross Mts. indicate generally suboxic (Permian) and oxic (Triassic, except for the Middle Muschelkalk) depositional environments with accompanying intensive bacterial reworking of organic remains. The biomarker spectra found in the Middle Muschelkalk and in the Entolium discites Beds (Upper Muschelkalk) show the presence of gammacerane, an increased concentration of C34 homohopanes and a Pr/Ph ratio not exceeding 1. All these observations suggest a hypersaline sedimentary environment with water column stratification and poorly oxygenated conditions. Thermal maturity investigations were based on both vitrinite reflectance and biomarker indices. The organic matter in the Triassic succession is slightly more mature along the northern margin of the Holy Cross Mts. than along their southern part, due probably to a regional increase in the maximum burial depth during the Mesozoic. The maturity of the Permian strata at Gałęzice (southern Holy Cross Mts.) is similar to that of the Triassic rocks whereas Kajetanów (in the north) is characterised by values significantly higher and comparable to those found in wells further north. The difference cannot be accounted for solely by differential burial depths, and implies the existence of a positive thermal anomaly active before the Middle Triassic. Our investigations generally confirmed the low thermal maturity of the Triassic. However, contrary to earlier interpretations, we suggest that the maximum burial depths based on a reconstructed thickness of the post-Triassic deposits may account for the observed maturity levels, assuming that geothermal gradients in the Mesozoic were similar to today's.
Źródło:
Geological Quarterly; 2002, 46, 1; 25-36
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of environment, temperature and time of the thermal modification of ash wood (Fraxinus excelsior L.) on the cellulose weight average degree of polymerization
Autorzy:
Gawron, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/2154078.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
wood
thermal modification
modification environment
cellulose
degree of polymerization
degradation
oxidation
Opis:
Influence of environment, temperature and time of the thermal modification of ash wood (Fraxinus excelsior L.) on the cellulose weight average degree of polymerization . Using the size-exclusion chromatography (HPLC SEC) method, the weight average degree of cellulose polymerization was determined. The polymer was isolated by the Kürschner-Hoffer method from ash wood (Fraxinus excelsior L.). The wood was thermally modified in different environments (nitrogen, steam and air) at 190°C and modification times of 2, 6 and 10 hours. Depending on the anaerobic atmosphere used, the highest values of the weight average degree of cellulose polymerization were obtained for the nitrogen environment, followed by steam and air. The effect of modification time on the weight average degree of polymerization was observed. The highest values were obtained for wood modified at 2 hours, then 6 and 10 hours of modification. The native wood showed the highest degree of polymerization. On the basis of the results obtained, it can be concluded that for the material studied the oxidation and degradation reactions occurring depend on the environment and time for a given temperature of wood modification.
Wpływ środowiska, temperatury i czasu modyfikacji termicznej drewna jesionu wyniosłego (Fraxinus excelsior L.) na wagowo średni stopień polimeryzacji celulozy. Wykorzystując metodę chromatografii wykluczania przestrzennego (HPLC SEC), wyznaczono wagowo średni stopień polimeryzacji celulozy. Polimer wyodrębniono metodą Kürschnera-Hoffera z drewna jesionu wyniosłego (Fraxinus excelsior L.). Drewno poddano modyfikacji termicznej w różnym środowisku (azot, para wodna i powietrze) w temperaturze 190°C i czasach modyfikacji wynoszących 2, 6 i 10 godzin. W zależności od zastosowanej atmosfery beztlenowej uzyskano największe wartości wagowo średniego stopnia polimeryzacji celulozy dla środowiska azotu, następnie pary wodnej i powietrza. Zaobserwowano wpływ czasu modyfikacji na wagowo średni stopień polimeryzacji. Największe jego wartości uzyskano dla drewna modyfikowanego w czasie 2 godzin następnie 6 i 10 godzin modyfikacji. Drewno natywne wykazuje największy stopień polimeryzacji. Na podstawie uzyskanych wyników można stwierdzić, że dla badanego materiału zachodzące reakcje utlenienia i degradacji są zależne od środowiska i czasu dla zadanej temperatury modyfikacji drewna.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2021, 116; 39--45
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Features of welding using integrated protection environment
Оsobennosti svarki s primeneniem kompleksnojj zashhitnojj sredy
Autorzy:
Druz, O.
Gitnaya, S.
Powiązania:
https://bibliotekanauki.pl/articles/792703.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
welding process
thermal energy
environment protection
railway vehicle
container
transportation
experimental study
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Atmosphere on the Type of Evolved Gases from Phenolic Binders
Autorzy:
Żymankowska-Kumon, S.
Kaczmarska, K.
Grabowska, B.
Bobrowski, A.
Cukrowicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/383144.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
environment protection
resin
emission
atmosphere
thermal analysis
ochrona środowiska
żywica
emisja
atmosfera
analiza termiczna
Opis:
The problem of harmful casting resins has been present in foundries for many years. Manufacturers are introducing new products that contain in their composition environmentally and eco-friendly ingredients. Unfortunately, not all types of technology can be used, sometimes environmental benefits are disproportionate to the quality of castings and their price. In the foundry industry, the most popular binders are based on organic compounds (often carcinogenic) and other harmful substances. Due to strict legal regulations regarding environmental protection, as well as care for the foundry's workers' comfort - their occurrence should be reduce to a minimum. These compounds often behave also depending on the conditions of use (temperature, atmosphere). The application of various methods of thermal analysis and spectroscopic methods allows to verify the mechanism of resin decomposition process in relation to conditions in the form in both inert and oxidizing atmosphere. For analysis the resins from cold-box technology, were used TG–DTG–DSC, Py-GC/MS methods and specified the course of changes occurring in combination of different atmosphere.
Źródło:
Archives of Foundry Engineering; 2020, 20, 1; 31-36
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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