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Search Results: 1 - 10 of 265778 matches for " Ma?e?i? Stevan "
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Model of the nonlinear reaction system with autocatalysis and autoinhibition: Stability of dynamic states
MaeiStevan,?upi? ?eljko,Kolar-Ani? Ljiljana
Hemijska Industrija , 2012, DOI: 10.2298/hemind120210034m
Abstract: Self-regulation, achieved through positive (autocatalytic) or negative (autoinhibitory) feedback is commonly encountered in natural, technological and economic systems. The dynamic behavior of such systems is often complex and cannot be easily predicted, necessitating mathematical modelling and theoretical analyses. The aim of this work is to analyze the dynamics of a minimal model system with autocatalytic and autoinhibitory steps coupled through the same species, in order to understand under which critical condition the system loses stability and passes through an Andronov-Hopf bifurcation. The analysis used was improved stoichiometric network analysis (SNA) in combination with bifurcation and sensitivity analysis.
Anomalous magnetothermopower in a metallic frustrated antiferromagnet
Stevan Arsenijevi?,Jong Mok Ok,Peter Robinson,Saman Ghannadzadeh,Mikhail I. Katsnelson,Jun Sung Kim,Nigel E. Hussey
Physics , 2015,
Abstract: We report the temperature $T$ and magnetic field $H$ dependence of the thermopower $S$ of an itinerant triangular antiferromagnet PdCrO$_2$ in high magnetic fields up to 32 T. In the paramagnetic phase, the zero-field thermopower is positive with a value typical of good metals with a high carrier density. In marked contrast with typical metals, however, $S$ decreases rapidly with increasing magnetic field, approaching zero at the maximum field scale for $T >$ 70 K. We argue here that this profound change in the thermoelectric response derives from the strong interaction of the 4$d$ correlated electrons of the Pd ions with the short-range spin correlations of the Cr$^{3+}$ spins that persist beyond the N\'{e}el ordering temperature due to the combined effects of geometrical frustration and low dimensionality.
Poplar efficiency in shelterbelts at some localities in Vojvodina
Luki? Sara,Do?iStevan
Glasnik ?umarskog Fakulteta , 2006, DOI: 10.2298/gsf0693121l
Abstract: The effect of poplar shelterbelts on the change of wind velocity has been studied. The measurements were performed by standard method at several points in front of the belt, behind and within the belt. Based on the study values, it can be concluded that poplar is efficient in reducing wind velocity, as the species for shelterbelts which are established for wind breaking. Their effect is significant at the distances up to 100 m behind the belt, which is significant when networks of shelterbelts are established to control wind erosion in the large deforested lowland areas which are mainly used for agricultural production. .
Importance of winter cereals with winter pea mixtures on family farms in Croatia
Zvonimir ?tafa,Darko Uher,Dubravko Maei,Dubravko Maei
Mljekarstvo , 2002,
Abstract: The object of this research was to ensure quality green forage and silage early in the spring on family farms in northern Croatia, through introducing winter cereals and Winter pea mixtures. For that purpose mixtures of Winter pea (cv. Maksimirski visoki) with triticale (cv. Clercal) were cut in the beginning of May, while the mixtures of Winter pea with wheat (cv. Sana and cv. itarka) were cut in the second half of May at family farms: Maleti (Ferdinandovac), Mirovi (Vi njevac), Bazi (M. Trojstvo), Mlinar (Kapela Podravska), Mu ini (Kri ev ec) i Uher (Grabovac). The mixtures were used to feed dairy cows from the beginning of flowering till the full bloom of Winterpea. The green mass yields (GMY) for mixtures of Winter pea with triticale cut in the beginning of pea flowering varied from 24.0 to 52.7 t/ha, while the GMY of mixtures cut in the full bloom of Winter pea were from 46.7 to 67.5 t/ha. Average dry matter yields (DMY) for mixtures of Winter pea with triticale cut in the beginning of flowering varied from 4.05 to 12.2 t/ha, while the DMY of mixtures cut in the full bloom of Winter pea were from 8.98 to 18.39 t/ha. All mixtures of Winter pea with triticale cut in the beginning of flowering had drymatter content (DMC) from 19.41 % while the DMC of mixtures cut in the full bloom of Winter pea were from 23.56 %. The GMY for mixtures of Winter pea with wheat cut in the beginning of pea flowering varied from 23.2 to 50.0 t/ha, while the GMY of mixtures cut in the full bloom of Winter pea were from 53.3 to 62.5 t/ha. The DMY for mixtures of Winter pea with wheat cut in the beginning of flowering varied from 4.39 to 9.49 t/ha, while the DMY of the same mixture cut in the full bloom were from 10.67 to 15.59 t/ha. All mixtures of Winter pea with wheat cut in the beginning of flowering had DMC from 17.0 % to 20.96 %, while the DMC of the same mixtures cut in the full bloom were from 20.00 % to 27.31 %.
The new cartographic projects in the Military Geographical Institute
Borisov Mirko,Radoj?iStevan,Ikonovi? Vesna
Glasnik Srpskog Geografskog Dru?tva , 2010, DOI: 10.2298/gsgd1003207b
Abstract: This paper gives an overview and some details about a few new projects in area of digital cartography production of Military Geographical Institute. The maps are presented at scales 1:25.000, 1.250.000, 1:300.000 and 1:1.000.000. All of them are made in order to satisfy rigorous criterion of Serbian Armed Forces, as a main user of those maps. Those are the first digital topographic, overview topographic and geographic maps in Serbia, too.
Immunohistochemical analysis of P53 and its correlation to the other prognostic factors in breast cancer
"Etebary M,Jahanzadeh I,Mohagheghi MA,Azizi E "
Acta Medica Iranica , 2002,
Abstract: Involvement of genetic alterations in breast cancer, one of the most common types of female malignancie, has been well documented . Among the possible alterations, mutations in several genes including p53 as an important prognostic factor, have been extensively studied. Mutated p5 Protein has longer half-life than the wild type protein that is detectable by immunohistochemistry (IHC). Our study included 72 tumor samples from unselected Iranian breast cancer patients. Tissue samples were stained with H&E to determin the histopathological type and malignancy grade of patients’ tumors. Nuclear p53 protein levels were also determined in tissue samples by IHC using DO-7 anti-p53 immunostaining and other prognostic factors. Results of our study indicated that the pattern of p53 immunostaining was significantly related to high malignancy grade (p=0.08) and age at diagnosis above 45 years (p=0.03). in conclusion, resultes of the present study indicated the validity and simplicity of application of IHC in determining the status of p53 protein. Our data support the results of other studies that have suggested that over expression of p53 protein can be considered as an indicator of increased malignancy potential and worse prognosis in breast cancer patients.
Productivity and quality of fodder sorghum hybrids S. Sioux and
Zvonimir ?tafa,Darko Uher,Dubravko Maei,Zvonko Jantol
Mljekarstvo , 2004,
Abstract: The objective of this study was to evaluate the yield and fodder quality of interpolated fodder sorghum as a second (additional) crop. The research was carried out on 4 family farms in lowland of northern Croatia between the Sava and Drava rivers. The area is densely populated, but the agricultural land is fragmented, unsuitably managed and utilized, and consists of different soil types. During the three-year trial carried out in different locations and conditions, the average green matter (GM) yield was 85.4 t ha-1 (73.0 – 93.3), while the dry matter (DM) yield was 14.11 t ha-1 (12.93-15.17). The mean crude fiber (CF) on DM concentration basis was 29.8 % (57.4 NDF, 28.8 % ADF and 13.8 % ADL), crude protein (CP) constituted 11.28 %, digestible crude protein (DCP) stood at 7.75 % and 6.38 MJ NEL. On average there were 1093 kg ha-1 DCP and 90.00 GJ NEL.
The importance of winter forage crops and mixtures in total fodder needs
Zvonimir ?tafa,Darko Uher,Dubravko Maei,Ivan Danjek
Mljekarstvo , 2001,
Abstract: Winter cereals and legume crops may be used in early spring as forages. The surpluses of produced mixtures are ensilaged. Under dry land conditions some mixtures are dried for hay, or used for grain production after physiological maturity. The early cultivars of fodder rapeseed (Perko and Star ka) were cut as early as in the middle of April, winter rye at the end of April, triticale at the beginning of May, while winter wheat cutting time was in the middle of May. Winter fodder pea can be used from the beginning of May and by the middle of June. The mixture of winter rye and fodder pea yielded 32.5 %, 26.3 %, 56.0 % and 26.0 % more green mass yield, dry matter yield, digestible crude protein and starch units, respectively, compared to pure winter rye crop. Generally, the advantages of winter cereals and legume mixtures are in higher and more stable yields, balanced fodder, easy cut, and decreased yield losses.
En torno al sexismo y la ense anza de textos argumentativos y narrativos
Gárate, M.,Tejerina, I.,Melero, Ma á.,Echevarría, E.
Ocnos , 2008,
Abstract: Este trabajo presenta la intervención llevadaa cabo en 4o de la ESO con el fin de mejorar lashabilidades de comprensión y escritura de textosargumentativos y narrativos, objetivo unido al logrode avances en la reflexión de los adolescentes sobreel tema del sexismo. Ofrece la descripción detalladadel procedimiento de ense anza-aprendizajeseguido y los resultados logrados en las distintasactuaciones realizadas.Sostiene que el tema de la discriminación de lamujer posee un gran interés para los estudiantes deeste nivel y resulta motivador para el aprendizaje dedistintos objetivos curriculares. Defiende finalmenteque los progresos en el campo lingüístico y literariose pueden alcanzar con éxito junto al desarrollo dela conciencia ética y el pensamiento crítico.
Optimization of Grillages Using Genetic Algorithms for Integrating Matlab and Fortran Environments
Darius Maiūnas,Juozas Kauna,Dmitrij ?e?ok
Science – Future of Lithuania , 2012,
Abstract: The purpose of the paper is to present technology applied for the global optimization of grillage-type pile foundations (further grillages). The goal of optimization is to obtain the optimal layout of pile placement in the grillages. The problem can be categorized as a topology optimization problem. The objective function is comprised of maximum reactive force emerging in a pile. The reactive force is minimized during the procedure of optimization during which variables enclose the positions of piles beneath connecting beams. Reactive forces in all piles are computed utilizing an original algorithm implemented in the Fortran programming language. The algorithm is integrated into the MatLab environment where the optimization procedure is executed utilizing a genetic algorithm. The article also describes technology enabling the integration of MatLab and Fortran environments. The authors seek to evaluate the quality of a solution to the problem analyzing experimental results obtained applying the proposed technology.
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