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Search Results: 1 - 10 of 1534 matches for " Perovi? Marko "
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Morphometric characteristics of the leaves of Greek maple (Acer heldreichii Orph) in central Serbia
Glasnik ?umarskog Fakulteta , 2007, DOI: 10.2298/gsf0796069p
Abstract: The taxonomic characteristics of Greek maple (Acer heldreichii Orph) were studied based on the analysis of leaf characteristics, by comparative-morphological method. The study was performed at three localities in central Serbia: Go , Jastrebac and Rudnik. 30 normally developed trees were selected per each locality, and 30 leaves were selected from each tree for the analysis. The study includes 8 measured and 15 derived characteristics of leaves. The study results were statistically processed by correlation analysis, analysis of variance and cluster-analysis. It is concluded that there are two varieties, var. heldreichii and var. macropterum. Four forms are set aside in the variety macropterum: f. typicum f. dissectum, f. Equiloba and f. rotundiloba. The populations are relatively homogeneous, and both varieties occur at all three localities in significant numbers.
Ecological and floristic characteristics of the new subassociation Aceri heldreichii-fagetum subass. Carpinetosum betuli on mt. Rudnik
PeroviMarko,Cvjeti?anin Rade
Glasnik ?umarskog Fakulteta , 2009, DOI: 10.2298/gsf0900179p
Abstract: Ecological and floristic characteristics of the new subassociation of the Balkan beech and Greek maple plant community with hornbeam (Aceri heldreichii-Fagetum subass. carpinetosum betuli) were studied. This subassociation is recorded and described on Mt. Rudnik, where it occurs at the elevations 950- 1,050 m, on moderate to steep inclinations (10-30°), and cold aspects: northern, northwestern and northeastern. Bedrock consists of sandstones and mudstones. The biological spectrum, ecological spectra and spectrum of distribution types of this community were calculated. The community has phanerophyte-hemicryptophyte character, it is mesophilous regarding soil moisture requirements and temperature requirements, it is neutrophilous to soil acidity, according to light requirements it is tolerant to semi-tolerant. The most numerous group of distribution types is Central European, which confirms the mesophilous character of this community.
Beech and fir association (Abieti-Fagetum serpentinicum Beus 1980) on Suvobor
Cvjeti?anin Rade,Novakovi? Marijana,PeroviMarko
Glasnik ?umarskog Fakulteta , 2011, DOI: 10.2298/gsf1103147c
Abstract: The association of beech and fir was researched on Mt. Suvobor, on serpentinite bedrock. In the past, the beech and fir forest on Suvobor was not studied, it was just referred to, so the objective of this paper was to study the floristic characteristics of this forest, which will enable its ecological-vegetational differentiation and widen the knowledge on beech and fir associations on serpentinites. The studied plant community is characterised by poor floristic composition and by the absolute domination of fir in the tree layer. In the life form spectrum, the dominant plants are phanerophytes, and the percentage of geophytes is increased, which points out the mesophilous plant community. The spectrum of floral elements indicates the dominance of the Central-European floral element, but also a significant percentage of some more xerophilous elements, which is the consequence of a specific parent rock.
Diversity of MAPs in some plant communities of Stara Planina
Obratov-Petkovi? Dragica,Popovi? Ivana,Belanovi? Sne?ana,PeroviMarko
Glasnik ?umarskog Fakulteta , 2006, DOI: 10.2298/gsf0694231o
Abstract: The high floristic diversity of Stara Planina was the starting base for the research of medicinal and aromatic plants (MAPs) in individual forest and meadow communities. The sites Javor and Prelesje, forest community Fagetum moesiacae montanum B. Jov. 1953, pioneer community of birch Betuletum verrucosae s.l. and meadow community Agrostietum vulgaris (capillaris) Pavlovi , Z. 1955, were researched as follows: soil types, floristic composition and structure of the community, percentage of MAPs, as well as the selection of species which, according to the predetermined criteria can be recommended for further exploitation. The study shows that the soil of the forest communities is eutric brown, and meadow soils are dystric and eutric humus-siliceous. The percentage of MAPs in the floristic structure of the study sites in forest and meadow communities is 32.35%. The following species can be recommended for the collection and utilisation: Hypericum perforatum L., Asperula odorata L., Dryopteris filix-mas (L) Schott. Urtica dioica L., Euphorbia amygdaloides L., Prunella grandiflora L. Tanacetum vulgare L., Achillea millefolium L., Rumex acetosa L., Campanula glomerata L., Stachys officinalis (L) Trevis., Plantago lanceolata W. et K., Potentilla erecta (L) Rauchel, Chamaespartium sagittale (L) P. Gibbs. Cynanchum vincetoxicum (L) Pers., Euphrasia stricta Host., Fagus moesiaca (Matt) Liebl. and Fragaria vesca L.
A coupled thermo-mechanical model of friction stir welding
Velji? Darko M.,Perovi? Milenko M.,Sedmak Aleksandar S.,Rakin Marko P.
Thermal Science , 2012, DOI: 10.2298/tsci110729012v
Abstract: A coupled thermo-mechanical model was developed to study the temperature fields, the plunge force and the plastic deformations of Al alloy 2024-T351 under different rotating speed: 350, 400 and 450 rpm, during the friction stir welding (FSW) process. Three-dimensional FE model has been developed in ABAQUS/Explicit using the arbitrary Lagrangian-Eulerian formulation, the Johnson-Cook material law and the Coulomb’s Law of friction. Numerical results indicate that the maximum temperature in the FSW process is lower than the melting point of the welding material. The temperature filed is approximately symmetrical along the welding line. A lower plastic strain region can be found near the welding tool in the trailing side on the bottom surface. With increasing rotation speed, the low plastic strain region is reduced. When the rotational speed is increased, the plunge force can be reduced. Regions with high equivalent plastic strains are observed which correspond to the nugget and the flow arm.
Why Rosenberg and Kaplan's attempt to reconcile physicalism and antireductionism concerning biology is unsatisfactory
Perovi? Slobodan
Theoria, Beograd , 2008, DOI: 10.2298/theo0801007p
Abstract: A. Rosenberg and D. Kaplan argue that their account of the Principle of Natural Selection (PNS), as a law of physical systems (including those systems studied by biology) underived from familiar physical laws, provides the precisely explanatory autonomy of biology sought after by antireductionists, without violating the principles of reductive physicalism. I argue, however, that the possibility of the PNS being an underived law of physical systems may be neutral to the explanatory autonomy of biology. In fact, if wedded with reductive physicalism (the possibility considered by these authors), it may yield only a very limited explanatory autonomy of biology, no stronger than the quasi-autonomy generally ascribed to it by reductionists. In the physicalist world, the PNS is operational and thus discoverable at the higher ontological levels (those concerning living cells, individuals, groups, populations and species), because the operation of a law concerning higher-level systems is grounded in its operation at the lower levels (atoms and molecules). Consequently, in terms of the explanatory criterion, a generalization discovered by biologists may be established as a law only if its status is confirmed in the form of its applicability to molecular and other systems studied by chemistry and physics. Otherwise, there is a danger that it could be a 'just so story.' The authors' narrow understanding both of antireductionism and biological laws as reducible to those concerning molecular systems provides only an illusory vindication of the explanatory autonomy: in the case of the PNS, although biologists happened to be the first to utilize it, their research concerning cells, individuals, populations and species could not possibly have established it as a law. This results, at best, in the inter-theoretic irreducibility of molecular biology as a discipline of physical science. I argue that a substantial explanatory autonomy of biology concerns the causal powers of biological systems at multiple levels, where the PNS, or any other biological law, is a basic law of nature in that it is concerned with the entities whose causal power is irreducible to that of the lower-level entities. Thus, only if confirmable at the levels higher than the molecular, could the generalizations discovered by biologists reflect such autonomy.
Mogu nosti Lije enja Osteoporotskih Prijeloma Kralje nice
Gojko Buljat , Darko Perovi
Archives of Industrial Hygiene and Toxicology , 2007, DOI: 10.2478/v10004-007-0008-4
Abstract: Osteoporosis is a skeletal disease characterized by reduced bone strength due to the loss of bone mass, structural disproportion and reduced calcium level as well as changes in the bone structure caused by trabecular deficit. The loss of bone mass in the vertebrae leads to an increased risk of fractures. Osteoporotic vertebral fractures are two to three times more frequent than hip fractures, especially in women. Osteoporotic compressive fractures of the spine mostly occur in the middle and lower thoracic spine and in the thoracolumbar spine. Common consequences of fractures include long-term pains, decrease in the height and spinal deformity, which significantly correlate with disorders in the gait and mobility, reduced pulmonary function, loss of appetite and in the end increased mortality. Clinical picture in acute conditions manifests itself as a sudden pain in the back following minimal trauma but also often without any trauma at all. Diagnostics is based on a detailed medical history and a thorough clinical examination. Radiological diagnosis relies on standard x-rays. In case of clinical indication (differential diagnosis of tumor or spondylitis, neurological weakness) CT and/or MR imaging is performed. The approach to the treatment of osteoporotic fractures of the spine is individual and is based upon the medical history, localization of symptoms and correlation of the clinical examination with the radiological finding. Open reduction, decompression and fixation are indicated in patients with posttraumatic stenosis and neurological weakness. Current operative methods include vertebroplasty and kyphoplasty, which significantly reduce pain and improve mobility of the patient and consequently, the quality of life.
Green development and participation-implications for countries in transition: Case study of Stara Planina, Republic of Serbia
Perovi? Ma?a
Spatium , 2008, DOI: 10.2298/spat0818038p
Abstract: The following research looks at opportunities and obstacles for applying public participation and sustainable environmental management in countries in transition. The case study analyses how the plans to develop a ski resort on the Stara Planina in the Republic of Serbia were created. The results show that factors which influence unsustainable developments are a lack of enforceable laws and the rule of law; lack of public awareness and information on relevant issues; weak civil society and lack of community involvement in decision making; high level of corruption in government and the public sector; highly politicized society with much influence from informal sources of power and their interests. The research concludes that with effective public participation the developments would be more environmentally sustainable. For participation to be effective there is a need to raise environmental awareness in the region as a consequence of the communist past and marginalisation of rural areas. .
Constitutional organization of the regional state in Spain
Perovi? Bojana M.
Medjunarodni Problemi , 2010, DOI: 10.2298/medjp1003489p
Abstract: The author explores distinctiveness of the regional state mostly in Spain as third model of territorial organization. Unlike unitary and federal, regional state is not wide-spread and broad accepted concept of vertical organization although modern Spain and Italy represents examples of good practice. Having in mind diversity of regional identities and strong cultural distinctiveness in Catalonia, the Basque Country, Galicia and other areas, author is wondering if any other model of territorial organization could be sustainable in such socio-cultural environment. After the period of Franco’s dictatorship, which had been trying to exterminate cultural and historical particularities among Spanish nations, decentralization demands have become more stronger resulting with the new constitution adopted in 1978. This act has set the corner-stone of modern Spanish democracy based on Autonomous Communities as specific forms of decentralized state and territorial autonomy.
Modern notion of time notion of history: About the basis of Heideggers' discussion with Hegel
Perovi? Milenko A.
Zbornik Matice Srpske za Drustvene Nauke , 2003, DOI: 10.2298/zmsdn0315007p
Abstract: In the text, the author analyses Heidegger's critique of Hegel's notions of time and history, reaching the conclusion that the weak points of that critique are contained in the fact that it did not take into account Hegel's idea of the phenomenology of time.
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