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Wyświetlanie 1-15 z 345
Tytuł:
Detection and estimation of overpressures in gas reservoirs while drilling
Autorzy:
Foidas, I.
Stefanescu, D.-P.
Vlasin, I.
Powiązania:
https://bibliotekanauki.pl/articles/298785.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
oil and gas reservoirs
detection and estimation of overpressures
Opis:
As part of rotary - hydraulic drilling method (the most common method for drilling the wells) the rock is displaced by the action of drilling bit, being removed from the bottom and brought to the surface, through the drilling fluid. Besides this function, the drilling fluid creates a backpressure against the borehole walls, overcoming the collapse of the poorly consolidated rocks as well as the fluids influx from the formations crossed by the well.
Źródło:
AGH Drilling, Oil, Gas; 2013, 30, 1; 87-95
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolutionary approach for obtaining the hub and spoke structure in the logistic network
Autorzy:
Mażbic-Kulma, B.
Stańczak, J.
Owsiński, J. W.
Sęp, K.
Powiązania:
https://bibliotekanauki.pl/articles/343812.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
kernel and shell
hub and spoke
logistic network
evolutionary algorithm
Opis:
In order to describe transportation system, as a routine a connection graph would be used. Vertices of the graph can be train stations, bus stop, airports etc. The edges show direct connections between vertices. A direct application of such graph can be difficult and computational problems can occur while one would try to organize or optimize such a transportation system. Therefore, a method of aggregation of such graph was introduced, using the general kernel and shell structure and a hub and spoke transformation method of the source graph. These structures allow to concentrate and order the transport of goods/persons among vertices and enable to reduce the number of analyzed vertices as well as edges of the graph. In the presented paper we continue our work on kernel and shell and its instance hub and spoke methods of connection graph transformation. In this paper we develop model of the transportation system using the hub and spoke method with predetermined, minimum and indirectly described numbers of hub nodes. To obtain the desired structures, several versions of specialized evolutionary algorithm (EA) were developed and applied.
Źródło:
Total Logistic Management; 2011, 4; 89-105
1689-5959
Pojawia się w:
Total Logistic Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastic interaction of couplings and pipes walls in tight threaded joints
Autorzy:
Paliychuk, I.
Powiązania:
https://bibliotekanauki.pl/articles/298908.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
oil and gas recovery
Opis:
Box threaded connections of pipes are used at oil and gas recovery. The pipe and the coupling interact elastically by their tapered surfaces with radial tightness in the thread and the sealing. Strength and impermeability of the connection depends on this interaction.The pipe and the coupling are thin-walled cylinders with the linear variable wall thickness. Their sections have varying lengthwise rigidity of walls and axial-symmetric bends. Therefore, their calculation differs from the Lame problem and from the calculation of cylinders with the fixed wall thickness.Physical and mathematical principles of the calculating parameters of elastic-strained state of all parts of pipe walls and coupling connections with the sealing box have been formulated in the article.
Źródło:
AGH Drilling, Oil, Gas; 2015, 32, 4; 731-737
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Petroleum substances in soil and groundwater in the urban areas
Autorzy:
Solecki, T.
Stopa, J.
Powiązania:
https://bibliotekanauki.pl/articles/298918.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
petroleum substances
soil and groundwater pollution
classification of soil and groundwater quality
Opis:
The result of human activity is polluting the soil and water. Based on the results of heavy metals studies it can be stated that the level of contamination of soil and water in urban areas is not high. This image is changing after taking into account other types of pollution. Besides some heavy metal contamination urban areas are contaminated with petroleum. Contamination of oil derivatives has a significant impact on the soil and water environment. In addition, some petroleum substances, such as petrol, have high vapour pressure. This causes a displacement of soil air from the vadose zone through the hydrocarbon gases, which creates a risk of explosion, especially in urban areas. This paper describes the pollution of ground-water oil derivatives in an urban area on the example of an oil filling station, operated for several years. In order to assess the condition of soil, 90 soil samples from different depths and 20 samples of groundwater were taken. Samples were taken for laboratory oil content tests. Using a computer program, a map of quality standards exceedances of soil and groundwater at the oil filling station and its vicinity was created. Results of laboratory tests of water samples are presented in tables and based on them, the classification of the underground water quality was made. Results of this study indicate a significant pollution of soil and groundwater exceeding the applicable standards. Condition of the soil and the quality of underground water in the oil filling station indicate the necessity of reparation.
Źródło:
AGH Drilling, Oil, Gas; 2016, 33, 1; 135-144
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Toeplitz versus Hankel: semibounded operators
Autorzy:
Yafaev, D. R.
Powiązania:
https://bibliotekanauki.pl/articles/254763.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
semibounded Toeplitz Hankel and Wiener-Hopf operators
closable and closed quadratic forms
Opis:
Our goal is to compare various results for Toeplitz T and Hankel H operators. We consider semibounded operators and find necessary and sufficient conditions for their quadratic forms to be closable. This property allows one to define T and H as self-adjoint operators under minimal assumptions on their matrix elements. We also describe domains of the closed Toeplitz and Hankel quadratic forms.
Źródło:
Opuscula Mathematica; 2018, 38, 4; 573-590
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extraction of scores and average from Algerian high-school degree transcripts
Autorzy:
Kefali, Abderrahmane
Drabsia, Soumia
Sari, Toufik
Chaoui, Mohammed
Ferkous, Chokri
Powiązania:
https://bibliotekanauki.pl/articles/305313.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
localization of areas of interest
table localization and recognition
table understanding
document analysis and recognition
digital archiving
physical and logical structure
Opis:
A system for extracting scores and the average from Algerian high school degree transcripts is proposed. The system extracts the scores and average based on the localization of tables gathering this information; it consists of several stages. After preprocessing, the system locates the tables using ruling-line information as well as other text information. Therefore, the adopted localization approach can work even in the absence of certain ruling lines or the erasure and discontinuity of the lines. After this, the localized tables are segmented into columns and the columns into information cells. Finally, cell labeling is done based on prior knowledge of the table structure, allowing us to identify the scores and the average. Experiments have been conducted on a local dataset in order to evaluate the performances of our system and compare it to three public systems at three levels; the obtained results show the effectiveness of our system.
Źródło:
Computer Science; 2020, 21 (1); 59-96
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multipoint normal differential operators of first order
Autorzy:
Ismailov, Z. I.
Powiązania:
https://bibliotekanauki.pl/articles/952785.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
differential operator
formally normal and normal operator
multipoint minimal and maximal operators
extension
selfadjoint
accretive and unitary operators
class of compact operators
spectrum of operators and its discreteness
asymptotics of eigenvalues
direct sum of spaces and operators
Opis:
In this paper we discuss all normal extensions of a minimal operator generated by a linear multipoint differential-operator expression of first order in the Hilbert space of vector-functions on the finite interval in terms of boundary and interior point values. Later on, we investigate the structure of the spectrum, its discreteness and the asymptotic behavior of the eigenvalues at infinity for these extensions.
Źródło:
Opuscula Mathematica; 2009, 29, 4; 399-414
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A majorization relation for a certain class of *-quivers with an orthogonality condition
Autorzy:
Bagro, O.V.
Kruglyak, S.A.
Powiązania:
https://bibliotekanauki.pl/articles/2049972.pdf
Data publikacji:
2004
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
algebras
categories and functors
representations
Opis:
In [1, 2, 3], *-algebras and *-categories over the field C of complex numbers were quasi-ordered with respect to the complexity of the structure of their *-representations with a majorization relation >-. A notion of *-wildness was also introduced there for an algebra (a category) if the algebra majorizes the *-algebra C* (F2)- In this paper, we discuss some methods for proving that an algebra is *-wild and obtain criteria for certain "standard" *-categories (ensembles with an orthogonality condition) to be *-wild.
Źródło:
Opuscula Mathematica; 2004, 24, 1; 5-17
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some stability conditions for scalar Volterra difference equations
Autorzy:
Berezansky, L.
Migda, M.
Schmeidel, E.
Powiązania:
https://bibliotekanauki.pl/articles/254995.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
linear and nonlinear Volterra difference equations
boundedness of solutions
exponential and asymptotic stability
Opis:
New explicit stability results are obtained for the following scalar linear difference equation [formula] and for some nonlinear Volterra difference equations.
Źródło:
Opuscula Mathematica; 2016, 36, 4; 459-470
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On one oscillatory criterion for the second order linear ordinary differential equations
Autorzy:
Grigorian, G. A.
Powiązania:
https://bibliotekanauki.pl/articles/255069.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Riccati equation
normal and extremal solutions
integral and interval oscillatory criteria
generalized Hill's equation
Opis:
The Riccati equation method is used to establish an oscillatory criterion for second order linear ordinary differential equations. An oscillatory condition is obtained for the generalized Hill's equation. By means of examples the obtained result is compared with some known oscillatory criteria.
Źródło:
Opuscula Mathematica; 2016, 36, 5; 589-601
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Projekt i wykonanie trójosiowego manipulatora Pick and Place
Design and construction of a three-axis Pick and Place manipulator
Autorzy:
Karelus, Paweł
Szopa, Krystian
Powiązania:
https://bibliotekanauki.pl/articles/2106535.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
manipulator
pick and place
SMD
OpenPnP
Opis:
W artykule przedstawiono projekt i wykonanie trójosiowego manipulatora Pick and Place, który oparty został na oprogramowaniu OpenPnP. Przeznaczony on jest do układania elementów SMD na płytkach PCB. Do wykonania projektu użyto gotowej ramy, która wymagała doboru odpowiednich silników i zaprojektowania wymaganych elementów dla osi Z, które zostały wykonane w programie Solidworks. Do skonstruowania manipulatora zastosowano napęd oparty na przekładni pasowej, jak i elementy pneumatyczne służące do podnoszenia komponentów. Dobrano i skonfigurowano również odpowiednie kamery wraz z oświetleniem, pozwalające na automatyczne sprawdzanie przebiegu pracy maszyny przez oprogramowanie. Kolejnym krokiem był dobór elementów elektronicznych maszyny i ich konfiguracja. Następnie skonfigurowano oprogramowanie OpenPnp i przygotowano je do automatycznego układania elementów SMD.
The article presents the design and implementation of a three-axis Pick and Place manipulator based on OpenPnP software. It is designed for the placement of SMD components on PCB boards. A ready-made frame was used for the project, which required the selection of appropriate motors and the design of the required components for the Z-axis, which were design in Solidworks software. A belt drive was used to construct the manipulator as well as pneumatic components for lifting the SMD parts. Appropriate cameras were also selected and configured along with lighting, allowing the software to automatically check the progress of the machine. The next step was to select the electronic components of the machine and configure them before OpenPnp software was configured and prepared for the automatic placement of SMD components.
Źródło:
Mining – Informatics, Automation and Electrical Engineering; 2021, 59, 1; 37-49
2450-7326
2449-6421
Pojawia się w:
Mining – Informatics, Automation and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and construction of a three-axis Pick and Place manipulator
Projekt i wykonanie trójosiowego manipulatora Pick and Place
Autorzy:
Karelus, Paweł
Szopa, Krystian
Powiązania:
https://bibliotekanauki.pl/articles/29520729.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
manipulator
pick and place
SMD
OpenPnP
Opis:
The article presents the design and implementation of a three-axis Pick and Place manipulator based on OpenPnP software. It is designed for the placement of SMD components on PCB boards. A ready-made frame was used for the project, which required the selection of appropriate motors and the design of the required components for the Z-axis, which were design in Solidworks software. A belt drive was used to construct the manipulator as well as pneumatic components for lifting the SMD parts. Appropriate cameras were also selected and configured along with lighting, allowing the software to automatically check the progress of the machine. The next step was to select the electronic components of the machine and configure them before OpenPnp software was configured and prepared for the automatic placement of SMD components.
W artykule przedstawiono projekt i wykonanie trójosiowego manipulatora Pick and Place, który oparty został na oprogramowaniu OpenPnP. Przeznaczony on jest do układania elementów SMD na płytkach PCB. Do wykonania projektu użyto gotowej ramy, która wymagała doboru odpowiednich silników i zaprojektowania wymaganych elementów dla osi Z, które zostały wykonane w programie Solidworks. Do skonstruowania manipulatora zastosowano napęd oparty na przekładni pasowej, jak i elementy pneumatyczne służące do podnoszenia komponentów. Dobrano i skonfigurowano również odpowiednie kamery wraz z oświetleniem, pozwalające na automatyczne sprawdzanie przebiegu pracy maszyny przez oprogramowanie. Kolejnym krokiem był dobór elementów elektronicznych maszyny i ich konfiguracja. Następnie skonfigurowano oprogramowanie OpenPnp i przygotowano je do automatycznego układania elementów SMD.
Źródło:
Mining – Informatics, Automation and Electrical Engineering; 2021, 59, 1; 25-36
2450-7326
2449-6421
Pojawia się w:
Mining – Informatics, Automation and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recognizing and describing processes in producing and abandoned oil- and gas reservoirs that may cause environment footprints and identifying technologies to impair these
Autorzy:
Ursin, J. R.
Powiązania:
https://bibliotekanauki.pl/articles/299080.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
MUSE Projects
oil and gas reservoirs
Opis:
The content in this report was presented at the 3rd MUSE steering committee meeting at UoS, in Stavanger, December 10th, 2015. The project report consists of five individual reports, each focusing on various themes: 1. Hydrocarbon Reservoir Behaviour during the Process of Abandonment and Thereafter by Victor Chukwudi Anokwuru, IPT/TN/UoS 2. Monitoring Techniques Applied to CCS-EOR by Intergrity Obara, IPT/TN/UoS 3. Risk Assessment by Emil Gazizullin, IPT/TN/UoS 4. Environmental Considerations of CO2 Projects by Oduro Takyiwa Susanna, IKM/TN UoS and Yen Adams Sokama-Neuyam, IPT/TN/UoS 5. How to Reduce the Likelihood of Environmental Impacts During Plug and Abandonment by Alexander Steine Johnsen, Preben Emil Haugen and Jann Rune Ursin, IPT/TN/UoS The reports are all written under supervision of the WP2 project leader. All reports are based on open sources; local (UoS) reports, publications available on the internet, official publications and journal papers, and communications with a great number of individual resource persons in the Norwegian oil and gas industry. The relevance of the work presented in the above mentioned reports, in relation to the MUSE project objectives is, as far possible, promoted through carefully following the project description (part of the AGH–UoS partnership agreement) and with reference to a preliminary WP1 progress report from mid February 2015; WP1-Selecting reservoirs for application of CO2 storage with IOR technology and feasibility studies. The work in the MUSE project is accomplished through the willingness and skills of UoS department master students, hired as project assistants. Fortunately for the project there are quite a few high class student, capable of writing high quality technical reports at UoS. The five reports are presented sequentially and all reports are the responsibility of the author and all reports are approved by the WP2 project leader.
Źródło:
AGH Drilling, Oil, Gas; 2016, 33, 2; 291-305
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical methods for hyperbolic differential functional problems
Autorzy:
Ciarski, R.
Powiązania:
https://bibliotekanauki.pl/articles/255099.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
functional differential equations
stability and convergence
Opis:
The paper deals with the initial boundary value problem for quasilinear first order partial differential functional systems. A general class of difference methods for the problem is constructed. Theorems on the error estimate of approximate solutions for difference functional systems are presented. The convergence results are proved by means of consistency and stability arguments. A numerical example is given.
Źródło:
Opuscula Mathematica; 2008, 28, 1; 29-46
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global existence and blow-up phenomenon for a quasilinear viscoelastic equation with strong damping and source terms
Autorzy:
Di, Huafei
Song, Zefang
Powiązania:
https://bibliotekanauki.pl/articles/2048895.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
viscoelastic equation
strong damping and source
blow-up
upper and lower bound
potential well
invariant set
Opis:
Considered herein is the global existence and non-global existence of the initial-boundary value problem for a quasilinear viscoelastic equation with strong damping and source terms. Firstly, we introduce a family of potential wells and give the invariance of some sets, which are essential to derive the main results. Secondly, we establish the existence of global weak solutions under the low initial energy and critical initial energy by the combination of the Galerkin approximation and improved potential well method involving with t. Thirdly, we obtain the finite time blow-up result for certain solutions with the non-positive initial energy and positive initial energy, and then give the upper bound for the blow-up time $T\text{}^{∗}$. Especially, the threshold result between global existence and non-global existence is given under some certain conditions. Finally, a lower bound for the life span $T\text{}^{∗}$ is derived by the means of integro-differential inequality techniques.
Źródło:
Opuscula Mathematica; 2022, 42, 2; 119-155
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 345

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