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Wyświetlanie 1-10 z 12
Tytuł:
Mechanical Activation of Deposited Brown Coal Fly Ash in Stirred Media Mill
Autorzy:
Molnár, Z.
Kristály, F.
Mucsi, G.
Powiązania:
https://bibliotekanauki.pl/articles/1375549.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Wk
Opis:
Present paper deals with the mechanical activation of deposited brown coal fly ash in a high energy density mill. The mechanical activation was carried out in a laboratory scale stirred media mill using various rotor circumferential speed (5 and 7 m/s), and different grinding time (from 1 min up to 180 min). The consumed energy was measured during the grinding process. Furthermore, particle size distribution and specific surface area were determined using laser particle size analyzer. The structural changes were detected by Fourier transform infrared spectroscopy. Additionally, transformation in mineralogical phases was measured by X-ray diffraction, as well as particle morphology and crystal defects were determined by transmission electron microscopy. As a result of the investigation, relationship between the technological parameters of the grinding and the properties of the ground material was created. It was found that there is a certain mechanochemical effect on the crystal structure of fly ash components in the stirred media mill, as it was revealed by X-ray diffraction and transmission electron microscopy. The most efficient grinding parameters were determined.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 988-993
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geopolymerisation of Mechanically Activated Lignite and Brown Coal Fly Ash
Autorzy:
Mucsi, G.
Molnár, Z.
Kumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/1375557.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Wk
Opis:
Geopolymers have been synthesized from mechanically activated lignite and brown coal fly ash. Mechanical activation of fly ash has been carried out using laboratory ball mill. To determine the structural changes in both, the fly ash and the resulted geopolymer, Fourier transform infrared spectroscopy measurements were performed. Isothermal conduction calorimetry method was applied to study the geopolymerisation reactions in mechanically non-activated (raw) and activated fly ash samples. The isothermal conduction calorimetry results showed similar peak intensity for mechanically activated (5-30 min) fly ash samples. However, the intensity of peak for 120 min milled brown coal fly ash was the highest. The compressive strength of the specimen was found to be dependent on the grinding residence time as well as composition/type of fly ash.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 994-998
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The history and natural regeneration of a secondary oak-beech woodland on a former wood-pasture in Hungary
Autorzy:
Varga, A.
Odor, P.
Molnar, Z.
Boloni, J.
Powiązania:
https://bibliotekanauki.pl/articles/59012.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
history
natural regeneration
secondary forest
oak-beech forest
socioeconomic change
forest cover change
large tree
wood pasture
Hungary
Opis:
Characteristic features of European woodland include both a reduction in natural forest areas and an increase in former agricultural areas occupied by secondary woodland. The management of these areas is challenging in terms of nature conservation, agricultural and forestry management and policy. The aim of our study was to reconstruct the history and to document the current tree stand structure for a secondary oak-beech woodland in Hungary. Towards the end of the 1800s, this area which was once almost completely occupied by a continuous forest, had been transformed into a wood-pasture. As a result of its gradual abandonment, the closed forest stand of the pasture increased from 10 to 52% between 1963 and 2005. The most characteristic feature of this woodland is the abundance of large trees. Globally, the number of large and ancient trees is rapidly diminishing. Therefore preserving and maintaining such areas, where large trees could live, is an essential management task.
Źródło:
Acta Societatis Botanicorum Poloniae; 2015, 84, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using traditional ecological knowledge in discovery of rare plants: a case study from Turkey
Autorzy:
Molnar V., A.
Suveges, K.
Molnar, Z.
Loki, V.
Powiązania:
https://bibliotekanauki.pl/articles/56877.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
Sustainable (and adaptive) management of natural resources is usually based on long term local experiences with nature. Local traditional communities often possess rich ecological knowledge connected to nature and traditional resource use and management. This knowledge can provide unexpected new information for researchers, and show new opportunities and ways for professionals in conserving rare and threatened species. We found significant new populations of the rare Ophrys lesbis in a private area next to the settlement of Çamlık, Muğla, and Orchis punctulata in the graveyard of Kadılar, Antalya with the help of local rural people. We firstly report the replanting of some orchid species (Orchis papilionacea, O. italica, and Barlia robertiana) in kitchen gardens of Çamlık and Bayır, in Muğla Province. The presence of significant orchid populations (e.g., the biggest ever found for Ophrys lesbis) in an area, where local owners have been actively harvesting salep from year to year for decades suggests that the moderate salep harvesting can be sustainable for long run. Based on our observations, Turkish salep harvesters can help botanists and conservationists find new locations of rare threatened orchid populations, and therefore indirectly help in conserve these populations.
Źródło:
Acta Societatis Botanicorum Poloniae; 2017, 86, 3
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synergetic use of lignite fly ash and metallurgical converter slag in geopolymer concrete
Autorzy:
Mucsi, G.
Rácz, A.
Molnár, Z.
Szabó, R.
Gombkötö, I.
Debreczeni, A.
Powiązania:
https://bibliotekanauki.pl/articles/88960.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
lignite fly ash
converter slag
geopolymer concrete
Opis:
The application and utilization of the industrial wastes and by-products in the construction industry is a key issue from an environmental and economic point of view. The increased use of lignite has substantially increased the available quantities of lignite fired power plant fly ash, which can be mainly classified as class C fly ash. The utilization of such raw material however has some difficulties. In the present paper lignite fired power station fly ash and metallurgical converter slag were used for the production of geopolymer concrete. The fly ash was used as a geopolymer based binder material, and a converter slag as aggregate, thus created a geopolymer concrete which contains mainly industrial wastes. As preliminary test experimental series were carried out using andesite as aggregate. The optimal aggregate/binder ratio was determined. The effect of the amount of alkaline activator solution in the binder, the aggregate type on the geopolymer concretes compressive strength and density was investigated. Furthermore, the physical properties - freeze-thaw resistance and particle size distribution - of the applied aggregates were measured as well. As a result of the experiments it was found that physical properties of the andesite and converter slag aggregate was close. Therefore andesite can be replaced by converter slag in the concrete mixture. Additionally, geopolymer concrete with nearly 20 MPa compressive strength was produced from class C fly ash and converter slag.
Źródło:
Mining Science; 2014, 21; 43-55
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation Between Pin Misalignment and Crack Length in THT Solder Joints
Autorzy:
Molnar, A.
Benke, M.
Gacsi, Z.
Powiązania:
https://bibliotekanauki.pl/articles/353833.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
THT solder joint
pin misalignment
crack propagation
thermal shock tests
Opis:
In this manuscript, correlations were searched for between pin misalignments relative to PCB bores and crack propagation after cyclic thermal shock tests in THT solder joints produced from lead-free solder alloys. In total, 7 compositions were examined including SAC solders with varying Ag, Cu and Ni contents. The crack propagation was initiated by cyclic thermal shock tests with 40°C / +125°C temperature profiles. Pin misalignments relative to the bores were characterized with three attributes obtained from one section of the examined solder joints. Cracks typically originated at the solder/pin or solder/bore interfaces and propagated within the solder. It was shown that pin misalignments did not have an effect on crack propagation, thus, the solder joints’ lifetime.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1063-1066
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neogene calc-alkaline intrusive magmatism of post-collisional origin along the Outer Carpathians: a comparative study of the Pieniny Mountains and adjacent areas
Autorzy:
Pécskay, Z.
Gméling, K.
Molnár, F.
Benkó, Z.
Powiązania:
https://bibliotekanauki.pl/articles/973597.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Outer Carpathians
Pieniny Klippen Belt
Neogene intrusive magmatism
K-Ar ages
boron concenrations
Opis:
A petrographical and geochemical analysis was carried out on intrusive rocks from the Pieniny and Moravian areas, with special attention to boron content and K-Ar radiometric ages. The intrusions form medium- to high-potassium calc-alkaline andesitic suites, which are compositionally slightly different from each other and from the other calc-alkaline sequences in the Carpathian-Pannonian Region. No significant geochemical differences were observed within the different phase intrusions in the Pieniny areas. However, there is a slight difference in major and trace element composition between the Moravian and Pieniny intrusions. The andesitic rocks in the Pieniny and Moravian area are enriched in large ion lithophile elements and light rare earth elements and depleted in high field strength elements, indicating a metasomatized mantle source of the parent magmas. The low boron concentration of the andesitic rocks in the Pieniny area is in the range measured in back-arc, intraplate basalts of the Bakony-Balaton Highland volcanic field, whereas the higher boron content of the Moravian rocks overlaps with that of the Western Carpathian andesites. This may indicates the heterogeneity of the mantle lithosphere below the areas, or indicates different magma evolution histories. On the basis of the systematic geochronological study, the intrusive rocks along the Outer Carpathians can be divided on three groups, which overlap with each other temporally. The oldest magmatism occurred from 14.8 Ma to 11.0 Ma in the Uhersky Brod area, Moravia, which was followed by the emplacement of andesitic dikes and sills in the Pieniny Mts., south Poland (13.5–10.8 Ma). In the Pieniny area, two intrusive phases were distinguished. Partly overlapping with this area, but generally younger than this magmatism, the emplacement of the youngest intrusions is referable to the Poiana Botizei-Ţibleş-Toroiaga-Rodna-Bârgâu intrusive area, Romania, where magmatic activity started at ~11.8 Ma and terminated at 8.0 Ma.
Źródło:
Annales Societatis Geologorum Poloniae; 2015, 85, 1; 77-89
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of land use change on land value in Hungary
Wpływ zmiany użytkowania gruntów na wartość ziemi na Węgrzech
Autorzy:
Toth-Naar, Z.
Molnar, M.
Vinogradov, S.A.
Powiązania:
https://bibliotekanauki.pl/articles/865120.pdf
Data publikacji:
2014
Wydawca:
The Polish Association of Agricultural and Agribusiness Economists
Tematy:
agricultural land
land use change
land value
Hungary
Opis:
Tracking and analysing economic and social changes in the agricultural sector is vital for decision makers, sectoral parties, professional and advocacy organisations and research institutions. Collected statistical data serve as a basis for domestic decision making and provide the foundation of strategy formulation in rural development, agro-environmental protection and sustainable agriculture. In the course of our research, analyses based on statistical databases were used to assess land use changes and land market prices. The structural survey of the Hungarian Central Statistical Office in 2013 shows that the proportion of business organisations utilising arable land grew 7 percentage points while individual farms increased their share by 2 percentage points. Our research shows that the concentration of land use increased demand for land and thus contributed to the increase in land prices.
Śledzenie i analiza zmian ekonomicznych i socjalnych w sektorze rolnym jest niezbędne dla osób podejmujących decyzje, organizacji zawodowych oraz instytucji badawczych. Zebrane dane statystyczne służą za podstawę do podejmowania lokalnych decyzji oraz formułowania fundamentalnej strategii dotyczącej rozwoju rolnego, rolnośrodowiskowej ochrony oraz rolnictwa zrównoważonego. W badaniach wykorzystano dane z bazy statystycznych, aby ocenić zmiany w użytkowaniu ziemi oraz jej cen rynkowych. Ze sprawozdania Węgierskiego Głównego Urzędu Statystycznego z 2013 roku wynika, że udział organizacji biznesowych użytkujących grunty uprawne wzrosła o 7 p.p., podczas gdy prywatne gospodarstwa rolne zwiększyły swój udział o 2 p.p. Badanie pokazały, że koncentracja gruntów zwiększa popyt na nie, ale przyczynia się także do wzrostu cen.
Źródło:
Roczniki Naukowe Stowarzyszenia Ekonomistów Rolnictwa i Agrobiznesu; 2014, 16, 6
1508-3535
2450-7296
Pojawia się w:
Roczniki Naukowe Stowarzyszenia Ekonomistów Rolnictwa i Agrobiznesu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verifying the prediction result reliability using k-ε, eddy dissipation and discrete transfer models applied on methane combustion using a prototype low-pressure burner
Autorzy:
Honus, S.
Pospíšilík, V.
Jursová, S.
Šmída, Z.
Molnár, V.
Dovica, M.
Powiązania:
https://bibliotekanauki.pl/articles/103231.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
burner
combustion
mathematical modeling
verification
Opis:
The article aims to verify the accuracy of a method to simulate the combustion chamber with a low-pressure prototype burner equipped with a specific “mixing element” and air baffle. The burner has an output of 4 kW and combusts methane. In detail, the article evaluates the accuracy of the final courses of temperatures and CO concentrations in the combustion chamber, which were obtained having combined the mathematical models k-ε, Eddy Dissipation and Discrete Transfer. CFD software CFX was used for the solution and visualisation of the results. The verification measurements imply that the final course of temperature plotted on the vertical axis of the combustion chamber differs from the real course by +21.7% on average. The predicted CO concentrations are relatively satisfactory in the chamber locations with lower temperatures – at the combustion chamber outlet the deviation from the measured value was +31.8%. Overall, the applied method may be considered acceptable to simulate the thermal field in a combustion chamber with the described burner.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 252-259
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 12

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