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Wyświetlanie 1-15 z 152
Tytuł:
Developing and deploying electronics assembly line optimization tools: a Motorola case study
Autorzy:
Tirpak, T. M.
Powiązania:
https://bibliotekanauki.pl/articles/375906.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
electronics assembly
line balancing
linear-integer programming
industrial case study
Opis:
The assignment of workloads to production equipment is one category of planning decision for an electronics assembly factory. In practice, line balancing requires not only selecting machines with sufficient placement accuracy and feeder capacity, but also addressing a host of other operational objectives and constraints. Motorola Labs led a multi-year effort to apply mathematical programming to balance a variety of production mix and volume scenarios. By representing the optimization problem as a specially structured, mixed linear-integer program, we were able to incorporate a high degree of reality in the model, simultaneously optimizing fixed setups, handling custom parts, maximizing machine uptime, and mitigating secondary bottlenecks. This paper presents the story of how we developed and deployed a software solution that significantly improved assembly cycle times, setup changeovers, and overall factory productivity, saving the company tens of millions of dollars.
Źródło:
Decision Making in Manufacturing and Services; 2008, 2, 1-2; 63-78
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Distributed Decision-Support System for Virtual Prototyping
Autorzy:
Tirpak, T. M.
Lach, L. E.
Xiao, W.
Lopez, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/375959.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Distributed Decision-Support
virtual prototyping
CAE
Opis:
Virtual Prototyping (VP) is a data-driven design process that promotes both knowledge reuse and innovation. High-profile applications in the automotive and aerospace industries have demonstrated its potential to significantly reduce prototype cycles, time to market, and total product cost. This paper addresses VP as a specialized application of Decision-Support Systems, and discusses common requirements for engineering design tools, as well as requirements specific to the design of electronic products, such as mobile phones. Motorola Labs' test bed for VP is introduced in terms of its open, agent-based architecture utilizing Java CORBA. One of the key principles of the VP System is the reuse of expert knowledge across multiple engineering domains. This is highlighted via several use cases, showing that the system can function not only as an Intranet-accessible repository of model services but also as an integral part of decision-making within the native CAD environment.
Źródło:
Decision Making in Manufacturing and Services; 2007, 1, 1-2; 137-152
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A class of nonlocal integrodifferential equations via fractional derivative and its mild solutions
Autorzy:
Wang, J.
Yan, X.
Zhang, X. H.
Wang, T. M
Li, X. Z.
Powiązania:
https://bibliotekanauki.pl/articles/255673.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
integrodifferential equations
fractional derivative
nonlocal conditions
resolvent operator and their norm continuity
fixed point theorem
mild solutions
Opis:
In this paper, we discuss a class of integrodifferential equations with nonlocal conditions via a fractional derivative of the type: [formula]. Some sufficient conditions for the existence of mild solutions for the above system are given. The main tools are the resolvent operators and fixed point theorems due to Banach's fixed point theorem, Krasnoselskii's fixed point theorem and Schaefer's fixed point theorem. At last, an example is given for demonstration.
Źródło:
Opuscula Mathematica; 2011, 31, 1; 119-135
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geotouristic attractions of the Danakil Depression
Autorzy:
Cieśluk, K.
Karasiewicz, M. T.
Preisner, Z.
Powiązania:
https://bibliotekanauki.pl/articles/128355.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Ethiopia
Danakil
Danakil Desert
Afar
Afrera Lake
Erta Ale
volcanoes
salt
Opis:
Geotourists and unconventional tourists will be definitely interested in the Danakil Valley. It is rarely visited place but absolutely extraordinary in many ways. It is in an area of divergence of lithosphere plates and, therefore connected to that, seismic and volcanic activity can be observed. Stunning terrain forms, geological structures, colours and diversity seem to be unreal. This desert is very inhospitable due to poisonous exhalations, omnipresent salt, an extremely hot climate, water deficiency and the fact that fauna andflora don't exist here. Despite all of these inconveniences, the Danakil Valley is inhabited by the Afars, a population thriving mainly on primitive salt production. Their rare culture is worth attention too. Not so long ago they were hostile and even now natives can be unpredictable and dangerous. Additionally, visitors should remember other difficulties: legal, organisational, financial and, above all, natural and climatic ones.
Źródło:
Geotourism / Geoturystyka; 2014, 1; 33-42
1731-0830
Pojawia się w:
Geotourism / Geoturystyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accessibility to Places of Evacuation for Inhabitants of Flood-Prone Areas in Mazovia Province
Dostępność do miejsc ewakuacji dla mieszkańców terenów zagrożonych powodziami w województwie mazowieckim
Autorzy:
Borowska-Stefańska, M.
Wiśniewski, Sz.
Andrei, M.-T.
Powiązania:
https://bibliotekanauki.pl/articles/386160.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
ochrona przed powodzią
ewakuacja
dostępność transportowa
województwo mazowieckie
GIS
tereny zalewowe
flood protection
evacuation
transport accessibility
Mazovian Province
flood plains
Opis:
W artykule podjęto próbę określenia dostępności do miejsc ewakuacji z terenów zagrożonych powodzią do najbliższych i osiągalnych obiektów użyteczności publicznej w granicach województwa mazowieckiego przy wykorzystaniu dwuetapowej metody określenia obszarów rynkowych (2SFCA). Za teren zagrożony powodzią przyjęto obszar tzw. wody stuletniej, który został wyznaczony na mapach zagrożenia powodziowego. Dla realizacji celu pracy niezbędne było wykorzystanie danych pochodzących z zasobu BDOT oraz OSM. Stwierdzono, że najgorsza sytuacja pod względem dostępności miejsc do ewakuacji w czasie do 15 minut występuje w południowo-wschodniej części województwa mazowieckiego oraz wzdłuż Bugu i Narwi, czyli tam, gdzie tereny zalewowe są szerokie i znajduje się dużo budynków mieszkalnych.
This article attempts to map out accessibility to places of evacuation from flood-prone areas to the nearest and most-accessible public utility facilities within the boundaries of the Mazovia province of Poland with the use of the two-step floating catchment area method (2SFCA). A flood-prone area is de- fi ned as an area of the so-called 100-year water that was delineated on flood hazard maps. In order to accomplish the aim of the work, it was necessary to use data from the resources of the Topographic Objects Database (BDOT) and OpenStreetMap (OSM). It was concluded that the worst accessibility to places of evacuation within 15 minutes may be found in the southeastern part of the Mazovia province as well as along the Bug and Narew Rivers, which is where flood plains are wide and many residential buildings are located.
Źródło:
Geomatics and Environmental Engineering; 2017, 11, 3; 31-47
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finding Playing Styles of Badminton Players Using Firefly Algorithm Based Clustering Algorithms
Autorzy:
Ilankoon, I.M.T.P.K.
Samarasinghe, U.S.
Ariyaratne, M.K.A.
Silva, R. M.
Powiązania:
https://bibliotekanauki.pl/articles/27312858.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
firefly algorithm
clustering
intra- and inter-cluster distance
badminton
Opis:
Cluster analysis can be defined as applying clustering algorithms with the goalof finding any hidden patterns or groupings in a data set. Different clusteringmethods may provide different solutions for the same data set. Traditionalclustering algorithms are popular, but handling big data sets is beyond theabilities of such methods. We propose three big data clustering methods basedon the firefly algorithm (FA). Three different fitness functions were definedon FA using inter-cluster distance, intra-cluster distance, silhouette value, andthe Calinski-Harabasz index. The algorithms find the most appropriate clustercenters for a given data set. The algorithms were tested with nine popularsynthetic data sets and one medical data set and are later applied on two bad-minton data sets with the intention of identifying the different playing stylesof players based on their physical characteristics. The results specify that thefirefly algorithm could generate better clustering results with high accuracy.The algorithms cluster the players to find the most suitable playing strategyfor a given player where expert knowledge is needed in labeling the clusters.Comparisons with a PSO-based clustering algorithm (APSO) and traditional al-gorithms point out that the proposed firefly variants work in a similar fashion asthe APSO method, and they surpass the performance of traditional algorithms.
Źródło:
Computer Science; 2023, 24 (3); 427--450
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Batch scheduling of deteriorating products
Autorzy:
Barketau, M. S.
Cheng, T. C. E.
Kovalyov, M. Y.
Ng, C. T. D.
Powiązania:
https://bibliotekanauki.pl/articles/375908.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
scheduling
batching
remanufacturing
deterioration
Opis:
In this paper we consider the problem of scheduling N jobs on a single machine, where the jobs are processed in batches and the processing time of each job is a simple linear increasing function depending on job's waiting time, which is the time between the start of the processing of the batch to which the job belongs and the start of the processing of the job. Each batch starts from the setup time S. Jobs which are assigned to the batch are being prepared for the processing during time S0 < S. After this preparation they are ready to be processed one by one. The non-negative number bi is associated with job i. The processing time of the i-th job is equal to bi(si - (si(b) + S0)), where si(b) and si are the starting time of the b-th batch to which the i-th job belongs and the starting time of this job, respectively. The objective is to minimize the completion time of the last job. We show that the problem is NP-hard. After that we present an O(N) time algorithm solving the problem optimally for the case bi = b. We further present an O(N2) time approximation algorithm with a performance guarantee 2.
Źródło:
Decision Making in Manufacturing and Services; 2007, 1, 1-2; 25-34
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The CC1 project – system for Private Cloud Computing
Autorzy:
Chwastowski, J.
Grzymkowski, R.
Kruk, M.
Nabożny, M.
Natkaniec, Z.
Olszewski, A.
Pałka, H.
Sobocińska, Z.
Sośnicki, T.
Szostak, M.
Syktus, P.
Wójcik, P.
Wojtoń, T.
Zdybał, M.
Żabiński, B.
Witek, M.
Powiązania:
https://bibliotekanauki.pl/articles/305307.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
virtual machine
cloud computing
private cloud
distributed computing system
Opis:
The main features of the Cloud Computing system developed at IFJ PAN are described. The project is financed from the structural resources provided by the European Commission and the Polish Ministry of Science and Higher Education (Innovative Economy, National Cohesion Strategy). The system delivers a solution for carrying out computer calculations on a Private Cloud computing infrastructure. It consists of an intuitive Web based user interface, a module for the users and resources administration and the standard EC2 interface implementation. Thanks to the distributed character of the system it allows for the integration of a geographically distant federation of computer clusters within a uniform user environment.
Źródło:
Computer Science; 2012, 13 (2); 103-111
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of hydraulic characteristic for borehole heat exchangers
Autorzy:
Śliwa, T.
Jaszczur, M.
Kruszewski, M.
Sapińska-Śliwa, A.
Bieda, A.
Kowalski, T.
Złotkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/298988.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
thermal response test
borehole heat exchanger
hydraulic characterization
Opis:
Thermal Response Test (TRT) is a standard test performed in borehole heat exchangers (BHE), which provides thorough understanding of thermal parameters of surrounding rock mass. Following work consists of calculations for hydraulic power and pressure losses along the BHE’s length. Analysis was carried out in eight BHE’s with different diameters, lengths and heat carriers in various areas throughout Poland. In accordance with TRT results, potential power exchanged between BHE and rock mass was determined. In order to find relations between pressure losses and volumetric flow rate, hydraulic tests in average static temperature of rock mass and during heating period were investigated. Proportions between hydraulic power and total power exchange with rock mass are also presented in following research.
Źródło:
AGH Drilling, Oil, Gas; 2017, 34, 1; 123-139
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Messinian palynoflora from Central Anatolian Plateau (Çankırı Basin)
Autorzy:
Atalar, M.
Kovacova, M.
Ozer, M.S.K.
Utescher, T.
Powiązania:
https://bibliotekanauki.pl/articles/184454.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
ALErl project
climatic boundary
tectonic boundary
Opis:
Within the framework of the Marie Curie FP7-PEOPLE-2013-ITN program, the ALErT project targets on tectonic and climatic boundary conditions in the regions along the densely populated and the associated with natural hazards part of the Central Anatolian Plateau. The wide Central Anatolian Plateau (CAP) extends between the Aegean extensional and Bitlis /Zagros compressional zones. The Çankırı Basin was opened in central Anatolia during Late Cretaceous between the Kırşehir block in the south and Sakarya continents in the north. During the Neo-Tethys closure, the basin became a large intermontane basin covered with continental sedimentary environments (Kazancı et al. 1999). During the Late Miocene, there were different types of lacustrine environments between the northern and southern parts of this basin. Age evidence of the Çankırı Basin deposits has been obtained from the European mammalian faunal zones, because the Sr analysis results have not be significant to interpreted age (Mazzini 2015). To figure out the paleoenvironmental and palaeoclimate changes in Çankırı Basin biotic (palynology) and abiotic proxy data (geochemical, δ18O – δ13C isotopes analyses and CaCO3) were analysed. Fifteen samples from Hancili Formation, Tuglu Suleymanli crossing border, Bozkır Formation and Değim Formation were collected from claystone, dark silty clay, gypsum and breccia with silty gypsum layers in the Çankırı Basin. The samples were treated by standard palynological procedures described by Cour (1974). All pollen samples, residues, and slides are stored in Comenius University in Bratislava, Slovakia. Each sample collected in the Çankırı Basin contains 150 pollen grains excluding Pinus . Pollen identification was performed under a Zeiss light microscope, and under a Quanta FEG250 Scanning electron microscope (SEM) used for high resolution imaging of pollen grains in Institute of Electrical Engineering Slovak Academy of Sciences. The pollen diagram was prepared with Tilia*-Graph (2.0) (http://www.chrono.qub.ac.uk/datah/tilia.html). According to Mosbrugger & Utescher (1997), coexistence approach derived quantative paleoclimate parameters. To explain the ecological characteristic, we used version of the Past 3.x – the Past of the Future free software scientific statistical data analysis program (http://folk.uio.no/ohammer/past/). Head map was prepared using program for four formations. The uplift during the Late Messinian in Çankırı Basin has been confirmed by palynological data and head map evaluation. We applied Xact 8 for the graphic presentation to show vegetation composition. We developed Steppe-Forest Index using a ratio of appropriate species of pollen (Traverse 1978), that serve as a climatic indicator (warm to cold), while interpreting aridity we follow Cour & Duzer (1978). As a consequence, the Poaceae/total Asteraceae ratio in a pollen diagram can be used as a climate index to find out dry to wet zones ines (Popescu 2006). It was calculated based on palynological results (using cluster analysis) to show that sections have four climate cycles with three dry periods. Based on those calculations, we confirmed long term cooling trend during the Late Messinian to the Plio-Pleistocene in Çankırı Basin. Most pollen spectra are mainly presented by Asteraceae, Chenopodiaceae, and Poaceae and by trees of Pinus, Cathaya, and Fagus. The group of herbs is important in the pollen spectra and mainly consists of Poaceae, Chenopodiaceae and Asteraceae, which document open grassland type of vegetation with warm – temperate climate.
Źródło:
Geology, Geophysics and Environment; 2016, 42, 1; 57-58
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of electromagnetic methods for polymetallic prospecting in mining conditions
Autorzy:
Gołębiowski, T.
Żogała, B.
Mendecki, M.
Małysa, T.
Powiązania:
https://bibliotekanauki.pl/articles/184537.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
GPR
electromagnetic profiling
petrophysics
copper mine
Opis:
The paper presents selected results of geophysical surveys carried out in the “Polkowice-Sieroszowice” copper mine in Lower Silesia, Poland. The aim of complex geophysical measurements was the analysis of the usefulness of selected electromagnetic methods for locating ore mineralisation zones in mining conditions. The results were obtained from surveys conducted along profiles designed on the side-wall by the roof, in the middle and the floor of the excavation. Electromagnetic Profiling and Ground Penetrating Radar techniques were applied for outlining the mineralisation zones consisting of Cu, Pb and Fe. The variability of geophysical recordings depending on the degree of mineralisation and distribution of fractures induced by mining activity were analysed. The results of geophysical surveys were correlated to petrophysical parameters and laboratory data concerning the percentages of Cu, Pb and Fe in samples taken from the side-wall at the survey site.
Źródło:
Geology, Geophysics and Environment; 2017, 43, 3; 181-189
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polynomial stability of evolution operators in Banach spaces
Autorzy:
Megan, M.
Ceausu, T.
Ramneantu, M. L.
Powiązania:
https://bibliotekanauki.pl/articles/254941.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
evolution operator
polynomial stability
exponential stability
Opis:
The paper considers three concepts of polynomial stability for linear evolution operators which are defined in a general Banach space and whose norms can increase not faster than exponentially. Our approach is based on the extension of techniques for exponential stability to the case of polynomial stability. Some illustrating examples clarify the relations between the stability concepts considered in paper. The obtained results are generalizations of well-known theorems about the uniform and nonuniform exponential stability.
Źródło:
Opuscula Mathematica; 2011, 31, 2; 279-288
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
[r, s, t]-colourings of paths
Autorzy:
Salvador Villa, M.
Schiermeyer, I.
Powiązania:
https://bibliotekanauki.pl/articles/255523.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
total colouring
paths
Opis:
The concept of [r, s, t]-colourings was recently introduced by Hackmann, Kemnitz and Marangio [3] as follows: Given non-negative integers r, s and t, an [r, s, t]-colouring of a graph G = (V(G), E(G)) is a mapping c from V(G) ∪ E(G) to the colour set {1, 2,..., k} such that ‌c(vi) - c(vj)‌ ≥ r for every two adjacent vertices vi, vj, ‌c(ei) - c(ej)‌ ≥ s for every two adjacent edges ei, ej, and ‌c(vi) - c(ej)‌ ≥ t for all pairs of incident vertices and edges, respectively. The [r, s, t]-chromatic number Xr,s,t(G) of G is defined to be the minimum k such that G admits an [r, s, t]-colouring. In this paper, we determine the [r, s, t]-chromatic number for paths.
Źródło:
Opuscula Mathematica; 2007, 27, 1; 131-149
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Virtual Underground City Osówka
Autorzy:
Jabłoński, M.
Lipecki, T.
Jaśkowski, W.
Ochałek, A.
Powiązania:
https://bibliotekanauki.pl/articles/184331.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Project Riese
mining
building
Opis:
Project Riese (German for giant) in the Owl Mountains (Góry Sowie), located in Lower Silesia, was the largest mining and building project of Nazi Germany. The construction work was done by forced laborers, POWs, and prisoners of concentration camp Gross-Rosen. Many of them lost their lives. The whole project was kept in secret, even the beginning of the construction work is unclear. The purpose of Riese remains uncertain because of lack of documentation, it is still rather a hypothesis than a fact. The only verified information is that the project was abandoned at the initial stage due to the approach of the Red Army. Before that, Nazis put a lot of effort to hide all information about Riese. Today, we can see how successful these efforts were. Nowadays, six underground structures were discovered in Walim and Głuszyca area: Włodarz (3000 m of tunnels), Osówka (1700 m of tunnels), Sokolec (or Gontów – 800 m of tunnels), Soboń (740 m of tunnels), Rzeczka (560 m of tunnels), Jugowice (500 m of tunnels) and about 600 m of tunnels under Książ Castle in Wałbrzych (Aniszewski 2002, Graba 2012). It has been found that many of the tunnels in some structures have a dead end, and there is a theory this might prove that all complexes were supposed to be combined. It is believed that many kilometers of the underground tunnels are still to be discovered (Cera 1998). The whole area is one of the most popular destinations for treasure hunters and scientists. Nowadays treasure hunters are using not only maps and metal detectors, but also GPRs. Scientists are interested in Riese because of many underground tunnels in various sizes and depth, as well as huge amount of steel which was used to reinforce adits. All these details allow scientists to perform many different types of research. Geophysicists are testing the equipment and methodology in the area of gravimetric, magnetic and GPR measurements. All geophysical measurements need to be put into the coordinate system, local or global. Moreover, to eliminate gravity or magnetic effect of the excavations and steel reinforcements their shape must be known (Porzucek 2013). To meet the needs of scientists, researchers, tourists and museum authorities, authors of this report, with the help of students, performed a full inventory of Osówka complex. It was performed in 2015 and covered all underground and ground objects. 1700 m of underground tunnels in the main part of the complex (Museum of Underground City Osówka) were scanned, together with 130 m of Sztolnia Wodna (from Polish water adit) and two ground objects: Siłownia and Kasyno. These two objects are supposed to be nuclear energy plants and Hitler’s headquarters or command headquarters (Cera 1998). During measurements, laser scanner (Faro, Focus 3D), tachymeter (Topcon, OS103) and GPS receivers (Topcon, HiperPro) for georeferencing were used. The main scientific importance of the study is a unique data set that was collected during this research. Afterwords, geometrical relations between objects of Osówka complex were analyzed. The previously supposed course of the Sztolnia Wodna and its destination was revised. Moreover, the possible lift shaft connecting Siłownia and underground part of Osówka was confirmed. The report presents location of objects in relations to each other which was not previously verified in research or verified in the other ways. Although, it is possible to do geophysics measurement on unexplored field, data from researches provides possibility of introducing excavations height and size amendments. Another inventory result is a virtual museum, available from 1st April for everybody on Museum of Underground City Osówka website (www. osowka.pl). The user can virtually explore the whole complex, including places where visitors are not allowed. During measurements, flooded adits have also been inventoried: the ones in the museum and in Sztolnia Wodna (entrance collapsed in November 2015 and the whole adit is in danger of collapsing). Inventory also included Siłownia (firstly, water has been pumped out to allow measurements in the staircase and alleged lift shaft). Another inaccessible place available during the virtual tour is shaft connecting the forest near Kasyno to the undergrounds. The virtual tour allows also measuring selected surface or distance between chosen points and checking coordinates or height in a particular spot. The user can generate a link to a screen which interests him and upload it to any website. It must be said that even sharing this amount of data doesn’t equate to possibility of conducting research and measurements in appointed spots. Project Riese is located on the land belonging to the local government, individuals and National Forests (the majority of it). Before taking any actions, area manager must give his permission. It is strictly enforced since the whole “golden train” story in July 2015.
Źródło:
Geology, Geophysics and Environment; 2016, 42, 1; 77-78
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of Vacuum Insulated Tubing in Deep Borehole Heat Exchangers
Autorzy:
Śliwa, T.
Kruszewski, M.
Assadi, M.
Sapińska-Śliwa, A.
Powiązania:
https://bibliotekanauki.pl/articles/299064.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Vacuum Insulated Tubing (VIT)
heat exchangers
Opis:
The world’s demand for energy is constantly increasing mainly due to population growth and improved living standards. Currently, the share of electricity generation is 37 of the global primary energy consumption. Fossil-based electricity production is accounted for 68 of the total generation with coal, the most carbon-intensive fossil fuel, being the largest contributor (41) to the world’s electricity supply in 2012. Electricity demand is projected to grow rapidly and is also expected to be 70 higher in 2035, than the current demand. The Polish energy sector is heavily dependent on coal, resulting in large CO2 emission per capita. Poland has considerable potential for geothermal energy production, as there is a large number of deep, abandoned wells that might be utilized for geothermal energy production. Utilizing these resources would contribute to the CO2 emission reduction without negative impact on security of energy supply. Following paper describes method of reconstructing negative or abandoned oil and gas wells for Deep Borehole Heat Exchangers (DBHE). In many old boreholes, exploiting underground geothermal waters is impossible, thus adaptation for DBHE is sometimes the only option to utilize geothermal heat reservoirs. The insulated coaxial inner column which enables the circulation of heat carrier plays the crucial role in effective functioning of DBHE systems. Vacuum Insulated Tubing (VIT) can improve heat production as well as increase efficient energy use. This technique found plethora of applications in offshore and onshore deep drilling and production. Throughout recent years, VIT technology is being more commonly applied in geothermal industry. Negative or abandoned wells could be reconstructed for DBHE. To maximize the heat uptake from such boreholes, it is advised to use inner column made from material with lowest possible thermal conductivity coefficient. Article deals with possible application of vacuum pipes as inner column in deep coaxial borehole heat exchangers.
Źródło:
AGH Drilling, Oil, Gas; 2017, 34, 2; 597-617
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 152

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