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Search Results: 1 - 10 of 89612 matches for " Ol?an Dragan I. "
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Antenna optimization using Particle Swarm Optimization algorithm
Golubovi? Ru?ica M.,Ol?an Dragan I.
Journal of Automatic Control , 2006, DOI: 10.2298/jac0601021g
Abstract: We present the results for two different antenna optimization problems that are found using the Particle Swarm Optimization (PSO) algorithm. The first problem is finding the maximal forward gain of a Yagi antenna. The second problem is finding the optimal feeding of a broadside antenna array. The optimization problems have 6 and 20 optimization variables, respectively. The preferred values of the parameters of the PSO algorithm are found for presented problems. The results show that the preferred parameters of PSO are somewhat different for optimization problems with different number of dimensions of the optimization space. The results that are found using the PSO algorithm are compared with the results that are found using other optimization algorithms, in order to estimate the efficiency of the PSO.
Body Language Eloquence as a Means of Linguistic Personality Formation
Ol'ga I. Marchenko
European Journal of Contemporary Education , 2013,
Abstract: Word, sound, movement – we interact via these channels of communication. Rhetoric act cannot be considered separately from the body “language”. Human gesture doesn’t’ refer to the motion display, but to the language. You might say, it expands the idea via movement to someone else (partner, listener, audience). The same statement, accompanied with different gestures, can have opposite meaning. The special knowledge of body movements combination is called kinesics, its acquisition and application is the important means of linguistic personality formation.
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Dragan Maru i , editor
Bulletin: Economics, Organisation and Informatics in Healthcare , 2011, DOI: 10.2478/v10221-011-0008-1
Chrysomyxa pirolata G. Wint in Rabenh: New parasitic fungus on the cones and seeds of spruce
Glasnik ?umarskog Fakulteta , 2007, DOI: 10.2298/gsf0796045k
Abstract: The new spruce disease known as "spruce cone rust" was discovered for the first time in Serbia and Montenegro. The fungus was detected in spruce forests only in the mountains regions (Kopaonik, Zlatar, Durmitor). This rust periodically damages the cones in localised forest areas and can be a serious problem. Usually seeds are not formed in diseased cones, and even when they are produced, malformation and resinosis of the cones hinder seed dispersal or extraction. Those seeds that are formed tend to weigh less and have poor germination. As this disease is a serious problem, care must be taken to prevent the spread of the disease to the new uninfected regions.
The distribution, hosts, epidemiology, impact and control of fungus Mycosphaerella pini E. Rostrup apud Munk in Serbia
Glasnik ?umarskog Fakulteta , 2004, DOI: 10.2298/gsf0490007k
Abstract: M. pini is one the most widespread and dangerous pathogenic fungi in the plantations of Pinus species in the world. This fungus has been observed on more than fifty Pinus species, and on European Larch, Douglas Fir, Norway Spruce, Serbian Spruce and Sitka Spruce. In Serbia, M. pini caused greatest damage in plantations of Austrian pine (P. nigra Arn). In Serbia both states of the fungus have been observed, i.e. conidiomata and ascostromata. Conidia are far more significant in the infection process. The critical period for infections is May - June. Of the all tested fungicides, the best results have been obtained by copper protectants. In heavily infected plantations of Austrian pine the protections should be carried out in the period when the plantations are 5-20(25) years old.
Antler growth in male roe deer in field hunting grounds in Vojvodina: Effect of age on trophy value
Glasnik ?umarskog Fakulteta , 2006, DOI: 10.2298/gsf0694109g
Abstract: Antler growth in male roe deer (Capreolus capreolus L) was studied on the representative sample consisting of 546 trophies (227 from Ba ka and 319 from Banat) hunted in the period 19982005. No significant differences in antler characters and trophy values were noted between Ba ka and Banat (except weight of antlers for 5 year old males), and the data for both regions were pooled. Antler growth is a curvilinear function of age. Mean values of length, weight and volume of antlers, and total trophy score varied significantly between the males in different age groups. The study results prove that in Vojvodina field hunting grounds, healthy males attain the culmination in antler growth and trophy value at the age of six years but already after the age of seven years, they show the first sign of old age and decline.
Low polyphase fluvial levels of the river Crni Timok in the basin of Zaje ar
Glasnik Srpskog Geografskog Dru?tva , 2004, DOI: 10.2298/gsgd0401029n
Abstract: The problem of origin and extension of the river terrace in Serbian valleys has been dealt with by many explorers. Beside those extensive investigations, this problem has not been explained enough. Therefore, more detailed investigations of river terraces were taken on a smaller region in the valley of the river Crni Timok in the basin of Zaje ar (the Eastern Serbia). A series of low river terraces (the first terrace of r.h. 3-5 m the second terrace of r.h. 5-10 m, the third terrace of r.h. 10-16 m and the forth terrace of r.h. 20-30 m) and two special levels (inundation level of r.h. 0-2 m and the level of low shelves of r.h. 2-4 m) were set aside on this tract. This series of low river terraces of the river Crni Timok brought about the idea of the cyclic origin of some terrace series, which is to be tested by future explorations.
The results of the speleological and speleoclimatic explorations of the great ice-cellar on Devica and of the ice-cellars of Rtanj and Tupiznica
Glasnik Srpskog Geografskog Dru?tva , 2002, DOI: 10.2298/gsgd0202045n
Abstract: The Great ice-cellar on Devica and the ice-cellars of Rtanj and Tupiznica are karst pits of the Karpatho-Balkan mountain system of the Eastern Serbia. These are specific speleological objects with the static ice-cellar characteristics and that implies the permanent retaining of the cold pit air without any circulation and also periodical duration of ice and snow. The climatic features of these pits are conditioned by their morphological characteristics and by the mountain climate. Our speleoclimatic explorations have pointed out to some smaller daily and somewhat bigger annual swayings of pit air temperature. These annual swaying influence the appearance and melting of ice and the absence of the air circulation between the pit and the outside in the warmer part of the year, while during the winter this circulation is present. Morphologically, these ice-cellars belong to the type of common oblique pits, while morphogenetically they are of tectonic-karst base.
Spring hunting of European roe deer in Vojvodina: Age structure and trophy value
Glasnik ?umarskog Fakulteta , 2005, DOI: 10.2298/gsf0592031g
Abstract: Trophies of the European roe deer are the main source of income in Vojvodina hunting grounds managed by hunting associations. The specificity of site conditions (agro-biotope) aggravates the hunting, especially regarding the assessment of the age and trophy value, so the best males are hunted before they reach the culmination of trophy development. The aim of this study is to define reliably the age of males in spring hunting and to analyze their trophy structure. The study results show that, in the majority of the study hunting grounds, spring (May) hunting was performed correctly and professionally, and the age structure and trophy value of the males were very favorable. The males that are considered as mature for shooting account for one half of the total spring hunting, while their percentage is even higher in the so-called "trophy hunting" (60.7%), which results in a high percentage of trophies in medals (21.5%).
Contribution to the study of fungi in the genera Sparassis Fr. and Hericium Pers. in our forests
Glasnik ?umarskog Fakulteta , 2006, DOI: 10.2298/gsf0693083k
Abstract: Fungi in the genera Sparassis and Hericium cause wood decay. In the forests of Serbia and Montenegro 4 species are identified in the genus Sparassis, and 3 species in the genus Hericium. These fungi develop on physiologically weakened trees, recently killed trees and branch litter (windthrows, broken trees, logs, thick branches). Especially great damage in the stands of Pinus species can be caused by the fungus Sparassis crispa. This fungus colonizes the living trees through the root and causes the brown cubical rot of wood. The rot then spreads from the root to the heartwood and gradually occupies the lower, economically the most valuable part of the tree. In the young phase, the fruiting bodies of all the identified species are edible. Sparassis crispa and Hericium erinaceus excel by their nutritive value and today (in some countries) they are even artificially cultivated.
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