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UTICAJ ASTROFIZIČKE PLAZME NA OBLIKE SPEKTRALNIH LINIJA

Dimitrijević, M. (Beograd , 2004)

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URI: http://hdl.handle.net/123456789/3298

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AdvancesInNonlinearSciences_112_2004.pdf ( 3.940Mb )
Uticaj gravitacionih mikrosočiva na X-zračenje akrecionog diska kod aktivnih galaksija

Jovanović, Predrag (Belgrade , 2005)

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URI: http://hdl.handle.net/123456789/348

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phdJP.pdf ( 3.632Mb )

Uticaj informaciono-komunikacionih tehnologija na interaktivnost nastave geometrije u višim razredima osnovne škole

Stojić, Maša (Beograd , 2014)

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URI: http://hdl.handle.net/123456789/3903

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masterMasaStojic.pdf ( 10.38Mb )

UTICAJ INTERAKCIJA UDALJENIH GALAKSIJA NA NJIHOVO NETERMALNO RADIO-ZRAČENJE

Pavlović, Marina (Beograd , 2022)

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Abstract:

The study of galaxies through high redshifts are key to understanding the evolution of galaxies through cosmic times. As such objects are very difficult to observe directly, they are mainly examined using empirically derived tools such as the numerous correlations between their different parametric characteristics, one of them being the linear relationship between far-infrared and radio emission in star-forming galaxies, named the Far Infrared-Radio (FIR) Correlation.Although the correlation was considered to be stable in terms of linearity, recent works, which include galaxies at high redshifts (0 < z < 6), showed a large deviation from the correlation in these systems. The goal of this doctoral dissertation is an examination of the physical processes that lead to this kind of behavior. As a possible cause of this evolution, we will assume for the first time, and examine interactions between galaxies (collisions and close approaches). Interactions be- tween galaxies lead to the formation of shock waves on large scales that can lead to changes in the relationship between infrared and radio emissions. Our hypoth- esis was tested in several stadiums and the main results are as follows: 1. We developed models of the evolution of the FIR correlation with redshift as functions of the galaxy interaction rate. We tested the models on a sample of galaxies with an already determined morphology separately for disc galaxies and for galaxies that have recently been or are currently interacting - irregular galaxies. 2. In a small sample of 34 galaxies that we took from paper Miettinen et al. (2017), it was shown that there is an indication that the interaction between galaxies can be responsible for the evolution of the correlation with the redshift. 3. The next analysis was performed on a much larger sample of star-forming galaxies taken from COSMOS field, where we did not find any evolution of corre- lation with the redshift. Also, it was shown that the mean value of the correlation parameter is lower in irregular galaxies than in disk galaxies. Although recent observations indicated an evolution of the FIR correlation with redshift, the results of this research failed to reproduce that evolution and showed that the FIR correlation is stable with redshift. However, it was also shown that due to the interaction of galaxies, the evolution of the FIR correlation is possible if the representation of interacting systems in the sample is higher.

URI:

http://hdl.handle.net/123456789/5460

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Disertacija_Marina_Pavlovic.pdf ( 8.624Mb )

Uticaj naponskih spregova na raspodelu napona u beskonačnoj oblasti sa eliptičnim otvorom

Milanović-Lazarević, Smilja (Belgrade , 1987)

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URI: http://hdl.handle.net/123456789/248

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phdSmiljaMilanovicLazarevic.PDF ( 4.155Mb )

Uticaj potencijala dugog dometa na Štarkovo širenje spektralnih linija plazme

Dimitrijević, Milan (Belgrade)

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Abstract:

A detailed analysis of the motion of a charged particle under the influence of Coulomb, polarization, and quadrupolar potential has been performed, and analytical expressions for particle path parameters have been obtained. Also, conditions for existence of a critical impact parameter, which separates paths ending in the atom from those going to infinity, have been examined, and methods for its determination have been elaborated. Results of this investigations have been applied to the theory of Stark broadening (broadening of spectral lines under the influence of collisions with charged particles), where a special attention has been paid to the adiabatic limit, and to quasistatic and impact approximations. Modification of Stark broadening functions has been performed and it has been demonstrated that the biggest influence of path curvature on them, is in the vicinity of the critical impact parameter, which separates paths ending in the atom from those going to infinity. The change in the values of the Stark broadening functions will have the largest influence on Stark broadening parameters for lines for which, at the most probable velocity, influence of the contribution of inelastic collisions is dominant and effective polarizability large. The application of semiempirical approximative approach for calculation of Stark broadening parameters for multiply charged emitters, has been analyzed as well, and the modification of semiclassical theory has been performed. The averaged ratio of experimental and theoretical results is 0.75 for semiempirical, 1.47 for semiclassical, and 1.04 for modified semiclassical approach.У раду је извршена детаљна анализа кретања наелектрисане честице под утицајем Кулоновог, поларизационог и квадруполног потенцијала и добијени су аналитички изрази за параметре путање честице. Такође су испитани услови за егзистенцију критичног сударног параметра, који раздваја путање које завршавају у атому од оних које одлазе у бесконачност, и разрађене методе за његово налажење. Резултати овог испитивања су примењени на теорију Штарковог ширења (ширења спектралних линија под утицајем судара са наелектрисаним честицама), при чему је посебна пажња посвећена адијабатској граници и квазистатичкој и сударној апроксимацији. Изведена је модификација функција Штарковог ширења и показано је да је највећи утицај закривљености путање на њих, у близини критичног сударног параметра, који раздваја путање које завршавају у атому од оних које одлазе у бесконачност. Промена у величини функција Штарковог ширења ће највише утицати на параметре Штарковог ширења код линија за које је, при највероватнијој брзини, утицај доприноса нееластичних судара доминантан а ефективна поларизабилност велика. Такође је анализирана примена семиемпиријског апроксимативног прилаза за израчунавање параметара Штарковог ширења за вишеструко наелектрисане емитере, при чему је извршена модификација семикласичне теорије. Усредњени однос експерименталних и теоријских резултата је 0.75 за семиемпиријски, 1.47 за семикласични а 1.04 за модификовани семикласични прилаз.

URI:

http://hdl.handle.net/123456789/77

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Dimitrijevic.pdf ( 6.262Mb )

Uticaj računovodstvenih informacionih sistema na performanse malih i srednjih preduzeća

Kovjanić, Milorad (Beograd , 2023)

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URI: http://hdl.handle.net/123456789/5598

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Milorad Kovjanić - Disertacija.pdf ( 2.190Mb )
UTICAJ RAZVOJA MATEMATIČKIH KOMPETENCIJA UČENIKA SREDNJIH ŠKOLA NA NJIHOV USPEH NA STUDIJAMA

Šijaković, Jelica (Beograd , 2013)

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URI: http://hdl.handle.net/123456789/4987

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Master rad Jelica Sijakovic.pdf ( 1.029Mb )
Uticaj sudarnih procesa na Limb-efekt

Vince, Ištvan (Belgrade)

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URI: http://hdl.handle.net/123456789/125

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phdIstvanVince.pdf ( 48.21Mb )
UTICAJ VISOKOENERGETSKIH PROCESA NA MODULACIJU MHD TALASA TOKOM ERUPCIJA NA SUNCU

Zeković, Vladimir (Beograd , 2012)

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URI: http://hdl.handle.net/123456789/5539

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Uticaj visoko e ... okom erupcija na Suncu.pdf ( 13.88Mb )
Utvrđivanje N-glikozilovanosti proteina metodama mašinskog učenja

Anžel, Aleksandar (Beograd , 2020)

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URI: http://hdl.handle.net/123456789/5013

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AnzelAleksandar.pdf ( 4.914Mb )
UV CETI TYPE VARIABLE STARS PRESENTED IN THE GENERAL CATALOGUE OF VARIABLE STARS

Tsvetkova, Katya (Beograd , 2015)

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URI: http://hdl.handle.net/123456789/4175

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04.pdf ( 250.0Kb )
Uvođenje polinoma u starijim razredima osnovne škole

Petrović, Milica (Beograd , 2016)

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URI: http://hdl.handle.net/123456789/4385

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Petrovic_Milica.pdf ( 378.5Kb )
Uvođenje realnih brojeva u osnovnu školu

Kovačević, Marina (Beograd , 2021)

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URI: http://hdl.handle.net/123456789/5299

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Uvodjenje realnih brojeva u osnovnu skolu.pdf ( 1.401Mb )
Uvodjenje celih i racionalnih brojeva

Tanasić, Mirjana (Beograd , 2016)

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URI: http://hdl.handle.net/123456789/4466

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masMirjanaTanasic.pdf ( 1.246Mb )
Uvod u astrodinamiku

Anđelić, Tatomir (Mathematical Institute, Belgrade , 1983)

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URI: http://hdl.handle.net/123456789/687

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TatomirAndjelicUvodUAstrodinamiku.PDF ( 5.768Mb )
UVOD U LOGIKU

Kovijanić Vukićević, Žana; Vujošević, Slobodan (Univerzitet Crne Gore , 2009)

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URI: http://hdl.handle.net/123456789/2790

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Uvod_Logiku.pdf ( 590.7Kb )
Uvod u logiku - drugi deo

Borisavljević, Mirjana (Saobraćajni fakultet Beograd , 2016)

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URI: http://hdl.handle.net/123456789/4680

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UvodULogikuIIMB.pdf ( 684.1Kb )

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