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    Wyświetlanie 1-4 z 4
    Tytuł:
    Fragmentation and the value-added structure of exports in Polish industry
    Autorzy:
    Posłuszny, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/108328.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    international trade
    global value chains
    fragmentation
    globalization
    Opis:
    The accession to the European Union contributed to an increase in Poland’s foreign trade, and the growing export market is coupled with an increasing importance of intermediate imports, which is necessary to produce goods of appropriate quality and price. This phenomenon is a part of the process of fragmentation in global value chains. Fragmentation of the value chains should manifest themselves, in particular, in a multi-phase manufacturing process that requires many components of different types. In this paper, the recently available OECD database of the Trade in Value Added (TiVA) has been used to assess changes in the composition of gross exports of Poland and other Central Europe countries. In Poland, practically all sectors show a growing share of the imported value added. The cases analyzed confirm the thesis that the high technology sectors foster fragmentation. In the case of technologically lessadvanced sectors and short-value chains, benefits of fragmentation are limited. The progressing fragmentation and, as a consequence, a growing share of the imported value added made the gross export value (which is commonly used in statistics) of little use for the analysis of the economic role and competitive position of sectors. However, thanks to new projects based on I-O matrices of the global economy, it is possible to decompose gross exports into respective domestic and foreign value-added streams.
    Źródło:
    Managerial Economics; 2015, 16, 2; 149-159
    1898-1143
    Pojawia się w:
    Managerial Economics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Introscopic camera to examine rock structure penetrated by drilling operations
    Kamera introskopowa do badania struktury skał w otoczeniu otworu wiertniczego
    Autorzy:
    Stasica, J.
    Rak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/348647.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    kamera introskopowa
    badanie struktury górotworu
    górnictwo
    geologia
    budownictwo lądowe
    introscopic camera
    examine rock structure
    mining
    geology
    building industry
    Opis:
    The article presents method of study of rock mass structure, consisting of penetration of borehole using a video camera. Examination in this method is simple and easy to performance. Advantage of presented device for rock mass recognition in relation to other devices and measure methods is that the device is equipped with an infrared video camera, which let conclude occurence of different layers, thickness and angle of inclination. Described equipment also allows observation of various types of discontinuity: from fractures to cavities.
    W artykule przedstawiono sposób badania struktury górotworu polegający na penetracji otworu badawczego przy użyciu kamery. Pomiar tą metodą jest prosty i łatwy w wykonaniu. Wyższość prezentowanego urządzenia, między innymi dla celów rozpoznawania budowy geologicznej skał, w stosunku do innych urządzeń i metod pomiarowych polega na tym, że urządzenie to, wyposażone w kamerę video działającą w podczerwieni, pozwala naocznie stwierdzić występujące rodzaje warstw skalnych, ich grubość oraz kąt nachylenia. Omawiana aparatura pozwala także na obserwację wszelkiego typu nieciągłości górotworu: od pęknięć do pustek i kawern.
    Źródło:
    AGH Journal of Mining and Geoengineering; 2012, 36, 3; 325-330
    1732-6702
    Pojawia się w:
    AGH Journal of Mining and Geoengineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Na-P1 zeolite synthesis and its crystalline structure ripening through hydrothermal process using coal combustion by-products as substrates
    Autorzy:
    Kunecki, P.
    Panek, R.
    Wdowin, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/184573.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    energy industry
    environment pollutant
    earth ecosystem
    Opis:
    Energy industry sector is one of the major environment pollutants. This branch also generates significant amounts of by-products such as slugs, slug-ash mixtures, ashes and microspheres, which can be very harmful for the earth ecosystems. Statistically the microspheres (MIC) constitute from 0.6% to 2.5% of the total amount of post combustion wastes. MIC occurs mainly in fly ashes (less often in slugs) as the smallest, hollow, spherical particles. MIC is composed mainly of crystalline and amorphous aluminosilicate phases. The combustion conditions have strong influence on MIC composition. Mineral and chemical composition of MIC is very similar to F type of fly ashes; consequently there is a possibility to use them as substrates for zeolite synthesis. Zeolites are minerals from microporous, aluminosilicate group (Szala et al. 2015). Among others, they are characterized by specific channels and chambers occurrence in their structure, which results in a number of important features like: ion exchange, sorption, molecular sieve or catalytic properties. This is the reason for wide use of zeolites in numerous industrial sectors (Ahmaruzzaman 2010). The aim of this study is a synthesis of Na-P1 zeolite at semi-technical scale by conversion of microspheres under hydrothermal conditions in an alkaline medium. This study involves also research of Na-P1 zeolite structure ripening in order to optimize the synthesis conditions. Microspheres from Stalowa Wola Power Plant (Poland) were used as a substrate. For the synthesis of Na-P1 phase the following conditions were applied: 90 dm 3 of water, 15 kg of microsphere, 11 kg of sodium hydroxide (3 mol/dm 3 ), temperature: 80°C, and reaction time up to 26 h (Franus et al. 2014). The zeolite conversion was performed on semi-technical scale installation (Wdowin et al. 2014). During the conversion, samples were collected from the reactor after 2, 4, 6, 10, 14, 26 hours. To investigate the influence of time for zeolitization process efficiency these samples were analyzed in terms of chemical and mineral composition, structural and textural properties. The main attention was paid to the evolution of the Na-P1 unit cell parameters observed as a function of time (calculations and models were performed for every sample). The phase’s composition was determined with powder X-ray diffraction (XRD) method using a PANalytical X’pert MPD diffractometer (with a PW 3050/60 goniometer), Cu lamp, and a graphite monochromator. The analysis was performed within the angle range of 5–65 2θ. PANalytical X’Pert Highscore software was used to process the diffraction data. The identification of mineral phases was based on the PDF-2 release 2010 database formalized by the ICD and IZA-SC Database of Zeolite Structures. The experimental calculations of the unit cell parameters were performed using UnitCell software. The spatial model of Na-P1 zeolite cell was prepared using Mercury 3.7 Windows software. The morphological forms and the chemical composition of the main mineral components were determined with scanning electron microscope (SEM) FEI Quanta 250 FEG equipped with the SE detector and a system of chemical composition analysis based on energy dispersive X-ray-EDS of EDAX company. N 2 adsorption-desorption measurements were carried out at 77 K using ASAP 2020 volumetric adsorption analyzer (Micromeritics). The specific surface areas (S BET ) of the samples were evaluated using the standard Brunauer–Emmett–Teller (BET) method for nitrogen adsorption data in the range of relative pressure p / p 0 from 0.06 to 0.3. The total pore volumes were estimated from single-point adsorption at a relative pressure of 0.98. XRD data indicates that main phases in microsphere are amorphous aluminosilicate glass, mullite and quartz. The obtained product is dominated by Na-P1 phase. Experimental calculations of cell parameters and fabricated models confirm crystallographic similarity to Na-P1 pattern. Noteworthy is the fact that the unit cell parameters depend on reaction time. Calculations indicate that the cell parameters (walls length: a , b , c and cell volume) increase with time towards to pattern values. This phenomenon may be interpreted as a ripening of crystalline structure. An in-depth look at this matter can lead to better estimation of synthesis conditions, which have a significant impact to the total cost of zeolites production – especially at a larger scale. SEM shows progressive dissolution (also as a function of time) of aluminosilicate glass in favor of crystallization of zeolite phase. EDS analysis confirms similarity of chemical composition of the obtained samples to a standard Na-P1 zeolite. Calculated textural properties indicate increase of S BET with the reaction time. Simultaneously, the average pore diameters decrease. The S BET of synthetized Na-P1 was 4.62 m 2 /g after 2 h but it increased to 47.92 m 2 /g after 26 h. This is an effect of growing contribution of zeolite phase in relation to the initial substrates in the sample during the reaction time. The experimental conditions allowed synthesizing Na-P1 zeolite from microsphere particles in the prototype installation. Zeolitization process strongly influences the textural properties by increasing S BET and improving pore structure. The microsphere from Stalowa Wola Power Plant is a promising material for the synthesis of Na-P1 zeolite in the prototype installation. Still, the reaction parameters should be reconsidered, basing on the obtained results, in order to reduce the cost of the zeolite production as much as possible. This is required before proceeding to the full technical production scale. To observe increase of zeolite amount in entirety synthesis batch (and to link it with cell behavior) the Rietveld analysis will be provided.
    Źródło:
    Geology, Geophysics and Environment; 2016, 42, 1; 90-91
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability of processes in the mining industry
    Stabilność procesów w przemyśle wydobywczym
    Autorzy:
    Burduk, A.
    Dąbek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/348817.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    stabilność procesów
    model BPMN
    wielowarstwowość struktury
    parametryzacja procesów
    stability of processes
    BPMN model
    multi-layer character of the structure
    parameterization of processes
    Opis:
    The purpose of this paper is to present the essence of building and monitoring the stability of processes in the mining industry. The foundation for building stable processes is to present the multi-layer character of their structure, build a model, and perform appropriate parameterisation. The analysis of activities was carried out for a single selected mining process - loading and haulage of copper ore output. A model was built for this process with the use of BPMN (Business Process Modeling Notation), which was then subjected to initial parameterisation. An algorithm of the control, which will ensure maintaining the stability, has been proposed for the analysed process.
    Celem niniejszego artykułu jest przedstawienie istoty budowania stabilności procesów w przemyśle górniczym oraz jej monitorowania. Podstawą budowy procesów stabilnych jest przedstawienie wielowarstwowości ich struktury, zbudowanie modelu oraz odpowiednia parametryzacja. Analiza działań została przeprowadzona dla jednego, wybranego procesu wydobywczego - ładowania i odstawy urobku rudy miedzi. Dla tego procesu został zbudowany model z wykorzystaniem notacji BPMN (Business Process Modeling Notation), który następnie poddano wstępnej parametryzacji. Dla analizowanego procesu zaproponowano algorytm sterowania, którego wykonanie zapewni utrzymanie stabilności.
    Źródło:
    AGH Journal of Mining and Geoengineering; 2012, 36, 3; 79-87
    1732-6702
    Pojawia się w:
    AGH Journal of Mining and Geoengineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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