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Search Results: 1 - 10 of 469696 matches for " Del?ev Sini?a "
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Calibration procedure for zenith plummets
Vukan OGRIZOVI?,Sinia DELEV,Jelena GU?EVI?
Geonauka , 2013,
Abstract: Zenith plummets are used mainly in applied geodesy, in civil engineering surveying, for materialization of the local vertical. The error of the vertical deflection of the instrument is directly transferred to the error of the observing construction. That is why a proper calibration procedure for the zenithlot is required. Metrological laboratory of the Faculty of Civil Engineering in Belgrade developed such calibration procedure. Here we present a mathematical model of the calibration and some selected results.
Staking-out projected boundaries of natural property Vr ac Mountains using the RTK GPS/glonass method
Gu?evi? Jelena,Ogrizovi? Vukan,Vasovi? Olivera,Delev Sinia
Glasnik Srpskog Geografskog Dru?tva , 2012, DOI: 10.2298/gsgd1204079g
Abstract: The existing topographic and cadastral maps of the former Yugoslav republics are in Gauss-Krüger projection on Bessel ellipsoid. For the collected GPS data to comply with the existing cartographic material, it is necessary to provide the transformation parameters from WGS84 to Bessel ellipsoid and according to the principles of cartographic mapping, to make mappings in the plane of the State Coordinate System (SCS). The aim of this research is to present the surveying activities necessary for the establishment and maintenance of digital cartographic basis, which is shown in the test area of “VR AC MOUNTAINS”, a Serbian region with outstanding characteristics. In order to establish a connection between the collected data, it is necessary to primarily calculate the parameters of transformation from WGS84 into the SCS. After the vectorisation of projected boundaries from bases made in the SCS, the transformation of vectorised boundary lines from SCS into the WGS84 is carried out, followed by staking the boundaries. To understand the fundamental differences in the methodology of using GPS receivers, it is important to emphasise that the concept of GPS determination of the coordinates is generally divided into absolute and relative positioning. If the correct procedure of GPS positioning, applied to certain environmental conditions, is not followed, the error up to 200 m could be expected. Conclusions are drawn about the selection of staking methods, related to the applied instruments and specific field conditions. The stakeout procedures are given in accordance with the principles of geodetic positioning. [Projekat Ministarstva nauke Republike Srbije, br. 043007: Istra ivanje klimatskih promena i njihovog uticaja na ivotnu sredinu: pra enje uticaja, adaptacija i ubla avanje]
Structure and silvicultural demands of some narrow-leaved ash stands in the area of the Special Nature Reserve "Gornje Podunavlje"
Bobinac Martin,Andra?ev Sinia
Glasnik ?umarskog Fakulteta , 2008, DOI: 10.2298/gsf0897079b
Abstract: The structure and silvicultural demands of two narrow-leaved ash stands of different origin and age was studied in the Special Nature Reserve "Gornje Podunavlje", in the area protected against floods. The elements of growth and structure in the 38-year-old natural stand in the area of previous wet depressions (dg=24,0 cm, dg20%=33,4 cm, hL=26,1 m, hg20%=27,65 m, N=745 kom·ha-1, G=33,81 m2·ha-1, V=433,3 m3·ha-1), and in the 74-year-old artificial stand on the site of the forest Fraxineto-Ulmetum effusae Slav. 1952 (dg=48,8 cm, dg20%=63,9 cm, hL=35,5 m, hg20%=36,7 m, N=288 kom·ha-1, G=53,86 m2·ha-1, V=842,30 m3·ha-1) point to very high production effects. The diameter distribution of trees is characterised by slight skewness and low kurtosis, and the height distribution of trees is characterised by left skewness. 154 future trees per hectare were selected in the 38-yearold stand, and in the twice older stand with the same initial selection criterion, the number of future trees per hectare was 82. The stands were treated by selection thinning of moderate weight (25% per G), i.e. low thinning based on qd=0.83-0.85. Thinning volume amounted to 109.8 m3·ha-1 in 38-year-old stand, and 207.4 m3·ha-1 in the 74-year-old stand.
Na effects of heavy thinning on Turkey oak tree and stand increment in the five-year period
Bobinac Martin T.,Vu?kovi? Milivoj,Andra?ev Sinia
Glasnik ?umarskog Fakulteta , 2003, DOI: 10.2298/gsf0387081b
Abstract: The effects of heavy thinning on tree and stand increment were studied on sample plots in the artificially established Turkey oak stand, aged 51 years. Before thinning, extremely low height and diameter increments were recorded and also the process of revitalization and tree decline. Heavy thinning at the stand age of 46 years removed 38.0% of trees and 31. 4% of wood volume. Five years later, on the heavily thinned plot, a lower current increment of basal area and volume per ha for 10-13% was measured, while the percentage of volume increment increased for 13%, and the diameter increment of the remaining trees for 17%. In the period after thinning, annual ring diameter increased in model trees for 1. 76- 2. 59 times compared to the previous five-year period.
Effect of planting density on diameter structure of black poplar clones S6-7 and M-1 - section Aigeiros [Duby]
Andra?ev Sinia,Ron?evi? Savo,Bobinac Martin T.
Glasnik ?umarskog Fakulteta , 2003, DOI: 10.2298/gsf0388007a
Abstract: The parameters of diameter structure of two black poplar clones in the section Aigeiros Duby (S6-7 and M-1) are presented depending on three different spacings: 3x3 m, 4.25x4.25 m and 6x6 m. Modeling of diameter structure was performed by Weibull’s function of probability distribution. We determined the effect of spacing (density) and clone both on the parameters and on the model diameter structure.
Orthodontic-surgical therapy of retained upper canine
Mirkovi? Sinia,?ar?ev Ivan,Bajkin Branislav,Tadi? Ana
Medicinski Pregled , 2012, DOI: 10.2298/mpns1206233m
Abstract: Introduction. Therapy of impacted teeth is undoubtedly one of the most intriguing issues for the experts in the field of dentistry. General dental practitioners, as well as specialists in the field of pediatric dentistry, periodontology, orthodontics and particularly oral and maxillofacial surgery have been facing this challenge throughout past several years. Each of these experts can contribute to solving this problem; however, each of them alone can solve only a limited number of cases. Discussion and Conclusion. Since recently, the fate of impacted tooth has been determined mainly by the competence, experience and skill of the orthodontist to apply light traction in an appropriate direction once the tooth has been made surgically exposed. Oral surgeon and orthodontist should share the responsibility for a patient with impaction as they together have the necessary skill and competence required for an effective therapy. In addition, dental age of the child is to be taken into consideration, as well as his/her overall health status and potential interference with other anomalies of dental arch.
A Common Fixed Point Theorem in Fuzzy Metric Spaces with Nonlinear Contractive Type Condition Defined Using Φ-Function
Sinia N. Je?i?,Nata?a A. Baba?ev,Rale M. Nikoli?
Abstract and Applied Analysis , 2013, DOI: 10.1155/2013/273872
Abstract:
Effect of planting density on the development of tree and plantation volume of Populus x euramericana (Dode) Guinier cl. I-214
Vu?kovi? Milivoj,Andra?ev Sinia,Ron?evi? Savo,Bobinac Martin
Glasnik ?umarskog Fakulteta , 2005, DOI: 10.2298/gsf0591077v
Abstract: The effect of plantation density on the stem volume development phases of mean trees of Populus x euramericana (Dode) Guinier, cl. I-214 were studied in the test plantation aged 25 years with two different planting densities 4.25x4.25 m (treatment A) and 6.00x6.00 m (treatment B). The modeling of stem volume growth of mean trees enabled the identification of development phases based on biological laws. Different growth dynamics of mean trees of the clone I-214, depending on plantation density, had a clear effect on the beginning and the end of individual phases, i.e. subphases of development, as well as on the diameters, heights and volumes of mean trees at the end of each phase of volume development.
Diameter structure modeling and the calculation of plantation volume of black poplar clones
Andra?ev Sinia,Vu?kovi? Milivoj,Ron?evi? Savo,Bobinac Martin T.
Glasnik ?umarskog Fakulteta , 2004, DOI: 10.2298/gsf0490037a
Abstract: A method of diameter structure modeling was applied in the calculation of plantation (stand) volume of two black poplar clones in the section Aigeiros (Duby): 618 (Lux) and S1-8. Diameter structure modeling by Weibull function makes it possible to calculate the plantation volume by volume line. Based on the comparison of the proposed method with the existing methods, the obtained error of plantation volume was less than 2%. Diameter structure modeling and the calculation of plantation volume by diameter structure model, by the regularity of diameter distribution, enables a better analysis of the production level and assortment structure and it can be used in the construction of yield and increment tables.
Elements of structure and productivity of clone I-214 (Populus×euramericana (Dode) Guinier) plantations on the river Sava alluvium
Andra?ev Sinia,Ron?evi? Savo,Vu?kovi? Milivoj,Bobinac Martin
Glasnik ?umarskog Fakulteta , 2010, DOI: 10.2298/gsf1001007a
Abstract: Two experimental plantations of Euramerican poplar (Populus×euramericana (Dode) Guinier) - clone I-214 were researched on the river Sava alluvium in Srem. Three sample plots were established in each of the plantations, aged 31 years. The soil type was humofluvisol (alluvial semigley), planting space 6×6 m. The plantations were established with 278 rooted cuttings per hectare, and the number of trees at the age of 31 accounted for 46.5-60.6%. The constructed height curves, mean stand height (hg) and upper (hg20%) heights show that the study plantations were established on different site classes, which was significantly reflected on other plantation growth elements and productivity. However, there was no significant effect of site class on the variability (sd and cv) and shape of diameter structure (α3 and α4). The constructed models of diameter structure for each site class (by Weibull function) differ by location parameter (a), and do not differ by parameter of scale (b) and shape (c). The tree and plantation growth elements show a high production potential of the clone I-214 which indicates that, on optimal soils and with the provided technological measures in the stage of nursery production and in the stage of plantation establishment, clone I-214 presents the good base for high production effects.
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