Browsing by Subject "temperature"

Now showing 1 - 20 of 27

Access status: Open Access ,
A method for taking into account local viscosity changes in single relaxation time the lattice Boltzmann model
(2012) Szucki, Michał; Suchy, Józef Szczepan
The aim of this work is to develop a numerical model, based on the lattice Boltzmann method, which allows for stable stimulation of incompressible fluid flows, including local changes in kinematic viscosity. The authors' interest lies in processes which take place during mould filling. In this publication, general information on the lattice Boltzmann method for two-dimensional single-phase flows were presented. A solution, based on the so called Fractional Step algorithm, which allows for defining kinematic viscosity in each mesh cell individually, was shown. The authors also described in detail a validation procedure for a presented model with the use of commercial simulation environment COMSOL Multiphysics. The results confirmed the correctness of the proposed solution. The presented method can be successfully used for the effective numerical modeling of liquid metal flows inside a casting mould.
Access status: Restricted ,
Analiza rozkładu temperatury przy pomocy termowizji
(Data obrony: 2017-07-13) Michałek, Jerzy
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Restricted ,
Analiza systemu naftowego złoża Strachocina
(Data obrony: 2017-09-29) Pyzik, Amanda
Wydział Geologii, Geofizyki i Ochrony Środowiska
Celem pracy jest analiza systemu naftowego w rejonie złoża Strachocina. Na podstawie regionalnych modeli strukturalnych, stwierdzono, iż oligoceńskie warstwy menilitowe mogą zostać uznane za potencjalną skałę macierzystą dla węglowodorów. Podjęto próbę określenia zasadności tej tezy, na podstawie dostępnych danych temperaturowych. Analizę przeprowadzono dla otworu testującego Kuźmina-1, ponieważ zaobserwowano, że na mapie anomalii siły ciężkości w redukcji Bouguera znajduje się on na przedłużeniu anomalii występującej na złożu Strachocina. Obliczenia wykonano za pomocą trzech metod, które umożliwiają określenie wartości temperatur na danych głębokościach, takich jak: metoda gradientu liniowego, metoda przeobrażenia smektyt-illit oraz metoda geochemiczna. Wyniki analiz wskazują, że jedynie w głęboko pogrążonych częściach warstw menilitowych, mogło nastąpić generowanie węglowodorów.
Access status: Restricted ,
Analiza wpływu zmiany temperatury na zmianę prędkości dźwięku w nadprzewodnikach
(Data obrony: 2019-09-05) Szklarz, Patrycja
Wydział Inżynierii Mechanicznej i Robotyki
Access status: Open Access ,
Analysis of the dependence between a temperature and working parameters of the MR damper
(Wydawnictwa AGH, 2007) Bajkowski, Jerzy; Bajkowski, Marcin; Grzesikiewicz, Wiesław; Sofonea, Mircea; Shillor, Meir; Zalewski, Robert
In this paper detailed description of temperature influence on MR damper working parameters has been described. Prototype of such a device and its mathematical description taking into considerations a thermal balance, have been proposed. Basing on experimental results, a connection between temperature and operating parameters of tested MR damper has been revealed.
Access status: Restricted ,
Antyroszeniowy kilkupunktowy sterownik wentylacji
(Data obrony: 2018-01-22) Gliński, Jarosław
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Open Access ,
Change-point detection and trend analysis in monthly, seasonal and annual air temperature and precipitation series in Bartın province in the western Black Sea region of Turkey
(Wydawnictwa AGH, 2020) Yaman, Barbaros; Ertuğrul, Mertol
Studies associated with climate change and variability are of great importance at both the global and local scale in the global climate crisis. In this study, change-point detection and trend analysis were carried out on mean, maximum, minimum air temperatures and total precipitation based on monthly, seasonal and annual scale in Bartın province located in the western Black Sea Region of Turkey. For this aim, 4-different homogeneity tests (von Neumann test, Pettitt test, Buishand range test and standard normal homogeneity test) for changepoint detection, Modified Mann–Kendall test and Şen's innovative trend test for trend analysis, and Şen's slope test for the magnitude estimation of trends were used. According to the test results, the summer temperatures in particular show increasing trends at the 0.001 significance level. Mean maximum temperature in August, mean minimum temperature in June and August, and mean temperature in July and August are in increasing trend at the 0.001 significance level. Over a 51 year period (1965–2015) in Bartın province, the highest rate of change per decade in air temperatures is in August (0.55°C for T$_{max}$, 0.46°C for T$_{min}$ and 0.43°C for T$_{mean}$) based on Şen's slope. However, the study showed that apart from October precipitation, there is no significant trend in monthly, seasonal and annual precipitation in Bartın. Increasing trends in mentioned climate variables are also visually very clear and strong in Şen's innovative trend method, and they comply with the statistical results. As a result, the study revealed some evidence that temperatures will increase in the future in Bartın and its environs.
Access status: Open Access ,
Charakterystyka termiczna głębokiej litosfery w rejonie Karpat polskich
(Wydawnictwa AGH, 2007) Wróblewska, Marta
Deep seismic sounding made in Europe enabled analysis of potential field methods to be made. The Carpathians were covered by seismic experiment CELEBRATION 2000 that initiated work with the problem within this area. Renewed analysis of borehole data, gathering new information together with applying a new estimation methodology respecting paleoclimatic effect, was the first preparatory stage for evaluation of deep lithosphere thermal regime in southern Poland. The outcome maps of temperature and heat flow density in Moho zone characterize thermal regime of the crust and allow research within the range of potential field issues to be continued. Increased values of heat flow and temperature are localized at Nowy Sącz - Krosno zone. It results from dipping - in of the asthenosphere that reaches here depth about 50 km.
Access status: Open Access ,
Climate Change Viewer: User-Friendly Web Tool for Climate Change Tracking in Ukraine
(Wydawnictwa AGH, 2025) Osypov, Valeriy; Filippov, Nazar; Mossur, Herman; Ahafonov, Yurii; Skrynyk, Oleg; Osadcha, Nataliia; Osadchyi, Volodymyr
An effective climate-change-adaptation strategy should be based on user-friendly and reliable climate services. Due to the lack of such services in Ukraine, this study aimed to develop a web tool called “Climate Change Viewer” (https://climate.uhmi.org.ua/) to visualize climate change in Ukraine and support the development of adaptation measures on a regional scale. The tool’s temperature and precipitation data sets include gridded observation-based time series (1946–2020), climate ERA5-Land reanalysis (1981–2020), and high-resolution regional climate projections of the EURO-Cordex initiative (1981–2100). Regular grids of historical data sets and climate projections have been aggregated within the administrative units and main river basins of Ukraine. Climate Change Viewer shows that the observed warming trend across Ukraine remains within the projected range but exceeds the mean of the climate models’ ensemble. The projected precipitation tends to increase in the northwestern and decrease in the southeastern parts of Ukraine through the end of the 21st century. The tool’s user-friendly interface and regional binding can help increase the awareness of national and local authorities, businesses, and the public sector about future risks of warming and water availability. The further development of Climate Change Viewer also considers other environmental and sector-specific parameters.
Access status: Open Access ,
Dependence of tensile wet strength from regeneration time and grain size of the matrix ceramic moulds
(2011) Kamińska, Jadwiga; Kolczyk, Joanna; Żymankowska-Kumon, Sylwia
Production technology of nwestment casting involves transmitting the elements of shape, dimensions and properties by filling in the appropriate liquid metal ceramic forms reproduced by a model made of wax removed by melting it. The manufacturing process of inwestment casting in the lost wax technology consists of a number of technological operations: preparing of wax models and their assembling in the model units, the preparation of ceramic mixture, successive layers of debris, wax melting in an autoclave, drying the samples at 100 °C, heating the samples at temperatures ranging from 400 to 700 °C. So far, the technology was based on the use of ceramic mixture, which the bond was hydrolysed ethyl silicate. Currently, due to environmental protection and improvement of working conditions, more and more binders with alcohol is replaced with an aqueous solution of colloidal silica. In the study, to create the individual layers a ceramic form, used regenerated ceramic mixture derived from foundry and green ingredients. The regeneration time was respectively 5 and 15 minutes. Used ceramic moulds after mechanical reclamation was given to sieve analysis to determine the grain size (di). Grain sizes 0.2, 0.4 and 0.63 mm were used for the coating of ceramic moulds. The paper presents results of research aimed at the determination of the relationship between tensile wet strength and grain size of ceramic mould: Rm = f[dL). Tests were conducted on cylindrical samples, which deposited the layers of reclaimed ceramic material.
Access status: Open Access ,
Effect of grain size of the reclaimed matrix ceramic moulds used in the lost wax technology on the strength at high temperature
(Wydawnictwa AGH, 2010) Kamińska, Jadwiga; Kolczyk, Joanna; Żymankowska-Kumon, Sylwia
Production technology of investment casting involves transmitting the elements of shape, dimensions and properties by filling in the appropriate liquid metal ceramic forms reproduced by a model made of wax removed by melting it. The manufacturing process of investment casting in the 8 lost wax technology consists of a number of technological operations: preparing of wax models and their assembling in the model units, the preparation of ceramic mixture, successive layers of debris, wax melting in an autoclave, drying the samples at 100 °C, heating the samples at temperatures ranging from 400 to 700 °C. So far, the technology was based on the use of ceramic mixture, which the bond was hydrolysed ethyl silicate. Currently, due to environmental protection and improvement of working conditions, more and more binders with alcohol is replaced with an aqueous solution of colloidal silica. In the study, as the basic of individual layers a ceramic form, used regenerated ceramic mixture derived from foundry and green ingredients. Used ceramic moulds after mechanical reclamation was given to sieve analysis to determine the grain size $(d_{L})$. Grain sizes 0.2, 0.4 and 0.63 mm were used for the coating of ceramic moulds. The paper presents results of research aimed at the determination of the relationship between tensile wet strength and grain size of ceramic mould: $R_{m} = f(d_{L})$. Tests were conducted on cylindrical samples, which deposited a layer of reclaimed ceramic material.
Access status: Restricted ,
Geologiczno-geofizyczna analiza perspektyw poszukiwawczych w rejonie Ropczyc - zapadlisko przedkarpackie
(Data obrony: 2017-09-29) Roś, Dominik
Wydział Geologii, Geofizyki i Ochrony Środowiska
The following project presents geological and geophysical analysis of Miocene deposits in the Ropczyce area. The analysis was carried out using PetroMod 1D v.11 software (Schlumberger). Models were made based on laboratory, seismic and well-logging data from Carpathian foredeep. Thermal history and compaction models were made based on well-logging data from the Góra Ropczycka-1K well and correlated with calculated vitrinite reflectance. In the second part of the project, 1D modeling for synthetic well was designed within the analyzed region. The purpose of the modeling was to reconstruct processes that took place during the basin formation. It has been shown that the transformation of rocks is too low for the presence of high temperature gas, however, the porosity in the miocen sediments is still high and can be an effective reservoir rock.
Access status: Open Access ,
Improved calculations for bottom hole injection pressure versus depth while gas injection for pressure maintenance of Tengiz field
(2010) Abdrahmanova, Diana; Jiyembayeva, Kalamkas; Žapbasbaev, Uzak K.
Celem projektu jest obliczenie ciśnienia zatłaczania na dnie otworu w funkcji głębokości w trakcie zatłaczania gazu w celu utrzymania ciśnienia w złożu Tengiz oraz określenie zdolności iniekcyjnych poszczególnych warstw złoża (Bash, Serp, Okskey). Podstawowym celem jest określenie korelacji dla siedmiu istniejących otworów iniekcyjnych oraz oszacowanie ciśnienia zatłaczania na dnie otworu na końcu rur (środkowy Bash, środkowy Serp, środkowy Okskey). Dla każdego otworu wylicza się indywidualną korelację na podstawie wartości głębokości, temperatury, ciśnienia i wydatku. W wyniku tego powstają odchylenia przewidywanej wartości ciśnienia w funkcji zmierzonego ciśnienia. W opinii autorów podstawowym powodem tego są różne szacowane prędkości zatłaczania, w zawiązku z czym trudne jest precyzyjne oszacowanie zatłaczanych objętości.
Access status: Open Access ,
Ludwigite-group minerals and szaibelyite - rare borate minerals from Vysoká - Zlatno skarn, Štiavnica stratovolcano, Slovakia
(Wydawnictwa AGH, 2016) Bilohuščin, Vladimír; Uher, Pavel
Beside of sedimentary evaporitic rocks, borate minerals occur also in some high temperature contact-metamorphic rocks, especially in skarns, locally in association with Fe and Sn ore minerals (e.g., Anovitz & Grew 1996).
Access status: Open Access ,
Mieszany problem początkowo-brzegowy w teorii termokonsolidacji. Zagadnienie początkowe
(Wydawnictwa AGH, 2009) Gaszyński, Jan
The paper presents solution of the system of equations for consolidation of porous medium where pores are filled by a low compressible liquid. The skeleton stress, pore pressure and field temperature are coupled. The solution of an mixed initial-boundary value problem for an axis - symmetric strain state for the consolidating half-space has been analyzed.
Access status: Open Access ,
Możliwości zagospodarowania wód geotermalnych Podhala do celów balneoterapeutycznych i rekreacyjnych
(Wydawnictwa AGH, 2008) Kępińska, Beata; Ciągło, Joanna
Geothermal waters of the Podhale region are connected with Mesozoic basement of the Podhale Basin and with Middle Eocene (carbonate) series. Their increased temperatures (20-86 degrees of Celsius) and content of hydrogen sulphide, silica and fluoride which have beneficial effect on human body, allow to consider them in the context of using in health care and recreation. The waters are presently used mostly in heating system of PEC Geotermia Podhalańska SA (based on four wells) and in two recreational centres in Zakopane and in Szaflary. Moreover, bathing facilities in Bukowina Tatrzańska and Białka Tatrzańska are under construction. Up to now some wells with geothermal waters remain unused. Some general proposals of their management for recreation and balneotherapy are presented in the paper. It was indicated that the development of healing-recreation sector based on geothermal waters in meaningful grade would widen the tourist offer of the region, by addition of very attractive form of recreation and health care.
Access status: Restricted ,
Ocena relacji i zależności pomiędzy zmianami temperatury warstw przypowierzchniowych a stężeniami alkanów gazowych zarejestrowanych w roku 2006 wzdłuż profili przechodzących przez obszar KPMG Mogilno
(Data obrony: 2010-02-04) Czamara, Agnieszka
Wydział Geologii, Geofizyki i Ochrony Środowiska
The purpose of thesis is the evaluation of relations and connections between the gas alkanes concentration and the temperature values recorded in close-surface formations. The researches have been carried out in 2006 in the Mogilno above salt-dome structures in the gas storage chambers area. The surface geochemical studies were taken, using gas-free method to indicate the concentration of methane, and its homologues. The temperature was measured in 105 points: 0,6 m and 1,2 m depth. The analysis of submitted samples was made using the gas chromatography method in the Department of Energy Stocks of University of Science and Technology AGH. The results of chromatographic analysis and the temperature measurements were subjected to statistical estimation and presented along the profiles in the linear graphs form on the background of geological and natural sources deposit models. Comparing the surface geothermal and geochemical changes, influence of Mogilno structure on the results can be seen, however there was no evidence of convergence for both applied methods.
Access status: Restricted ,
Ocena stabilności składników głównych i swoistych w wodach ujmowanych przez rozlewnie wody mineralnej „Muszynianka” w Muszynie
(Data obrony: 2011-07-08) Miczulska, Katarzyna
Wydział Geologii, Geofizyki i Ochrony Środowiska
One of the key issues related to the mining of mineral water is to determine the stability of the chemical constituents of water. The aim of my work was to determine the stability of the components of mineral waters exploited by „Muszynianka” in Muszyna. Selected components of the main ones are calcium, magnesium, bicarbonates, in turn specific components is carbon dioxide. In addition, the sum researched solids dissolved in water and temperature.
Access status: Restricted ,
Rejestrator temperatury
(Data obrony: 2018-01-29) Kłeczek, Aleksandra
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Open Access ,
System bieżącej diagnostyki stanu elementów przenośnika
(Wydawnictwa AGH, 2011) Leśniewski, Konrad; Wiśniewski, Jarosław; Zimroz, Radosław
This paper deals with description of principle features of the online condition monitoring system designed by Institute of Mining for Lignite Surface Mine PGE KWB Turów. Main topics of the paper cover: basic parameters of monitored belt conveyor, list of elements being monitored and acquired variables. A several types of acquisition channels has been defined, namely: vibration (acceleration), current, rotational shaft speed and temperature. Location of sensor has also been proposed. Some detailed information has been provided regarding diagnostics and monitoring methods. The information stream, its structure and timing and some technical issues as data transmission standards selections have been described. At the end a dedicated user interface has been discussed. It was underlined that system is open and its final shape can evolve depending on the needs of maintenance staff in Turów Mine.