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Method of analysis of spectrum signal in diagnosis roller bearings
No full textAutomatically advances in technology, increased industrial capacity, a sharp increase in
productivity, the struggle for competitive products, the safety requirements have created the
necessary preconditions for the emergence of technical diagnostics of equipment condition.
Nuclearisation process and the formation of a new direction is evolutionary. Thus, a special honor
in the world in companies belonging to the master, who, as a listener to the touch or the ear with a
screwdriver or a stethoscope measured small changes in the machines. The results of this diagnosis
is greatly influenced by human factors, and evaluation are often subjective. Constantly tightening
conditions for safe operation is necessary to create the main objective quantitative assessment of
equipment. The first tracking devices that monitor the parameters for vibration, appeared at the end
of 40 -h years. With stationary systems, it becomes possible to prevent damage and to stop the
machine until they are completely destroyed, but the precise definition of defective components
using analog devices at the time it was impossible to prove
Security among students in school buildings during natural disasters
Get PDFU radu su izneti rezultati kvantitativnog istraživanja percepcije učenika srednjih škola o njihovoj bezbednosti u školskim objektima za vreme prirodnih katastrofa. Autori koriste metod anketiranja učenika kako bi identifikovali i opisali faktore koji utiču na percepciju bezbednosti učenika. Iz ukupne populacije učenika srednjih škola u Beogradu, za potrebe ovog istraživanja izvučen je uzorak veličine 3.063 učenika, što čini 4.67% populacije. Iz populacije od 101 Beogradske srednje škole na slučajan način izabrano je njih 13. Rezultati istraživanja pokazuju da se 40,2% učenika oseća bezbedno, 37,8% nije sigurno i 21,8% ističe da se oseća nebezbedno u školskim objektima kada su u pitanju posledice prirodnih katastrofa. Nadalje,
rezultati ispitivanja uticaja određenih faktora na
percepciju bezbednosti učenika pokazuju da postoji statistički značajna povezanost sa promenljivama – pol, obrazovanje majke, obrazovanje oca, ostvarena prosečna ocena, dok takva povezanost nije utvrđena sa promenljivama – zaposlenost roditelja, živi sa ocem, sa majkom, dedom i babom. Istraživanje se bazira na područje Beograda, tako da se zaključci mogu generalizovati samo na
populaciju učenika srednjih škola na tom području. Rezultati istraživanja se mogu iskoristiti prilikom kreiranja strategija unapređenja bezbednosti učenika u školskim objektima od posledica prirodnih katastrofa
Distributional properties and parameters estimation of GSB Process: An approach based on characteristic functions
No full textA general type of a Split-BREAK process with Gaussian innovations (henceforth, Gaussian Split-BREAK or GSB process) is considered. The basic stochastic properties of the model are studied and its characteristic function derived. A procedure to estimate the parameter of the GSB model based on the Empirical Characteristic Function (ECF) is proposed. Our simulations suggest that the proposed method performs well compared to a Method of Moment procedure used as benchmark. The empirical use of the GSB model is illustrated with an application to the time series of total values of shares traded at Belgrade Stock Exchange
The reform of pelanty system for the purpose of combating crime
No full textReforma krivičnog materijalnog zakonodavstva uvek podrazumeva reviziju sistema krivičnih sankcija, u prvom redu sistema kazni. Potrebno je napraviti balans izme|u potrebe suzbijanja kriminaliteta, promena koje nastaju u društvu i temeljnim novelama opšteg i posebnog dela koje su uslovljene novim, teškim oblicima kriminaliteta, iskustvima u primeni dosadašnjih rešenja i savremenim dostignućima u nauci krivičnog prava i njihovoj primeni u uporednom pravu. Stoga, u radu se analiziraju osnovne postavke Krivičnog zakonika Srbije koje se odnose na sistem kazni. U prvom delu rada, koji je ujedno posvećen i uvodnim napomenama, ukazuje se na dinamičnu fazu kroz koju prolazi krivično zakonodavstvo Srbije, što je svojstveno i drugim evropskim zemljama. Dalje, pruža se pregled odgovarajućih odredbi Krivičnog zakonika Srbije koji je stupio na snagu 1. 1. 2006. Zbog sveobuhvatnog pristupa, analizom su obuhvaćena i rešenja koja su rezultat izmena i dopuna Krivičnog zakonika u 2009. i 2012. godini. Izmene i dopune koje su usledile 2013. i 2014. godine nisu bile od značaja za sistem kazni. Posebna pažnja posvećena je višedecenijskim pokušajima da se u naše krivično zakonodavstvo uvede kazna doživotnog zatvora. Imajući u vidu potrebu za argumentovanom i kritičkom analizom više puta predloženog rešenja o kazni doživotnog zatvora cilj nam je da procenimo glavne razloge koji se iznose u prilog ove kazne kao i one protiv. Razmatranjem novih odredbi uvedenih u cilju suzbijanju kriminaliteta, ali i zauzimanjem stava u pogledu odre|enih pravnih pitanja autor je dao predloge de lege ferenda.The reform of the substantive criminal legislation always implies a
review of the system of criminal sanctions, primarily of penalty system. It is necessary to create a balance between the need to combat crime, changes occurring in the society and the fundamental amendments to the General and Special
parts of the Criminal Code that are conditioned by new, serious forms of crime,
the experiences in the application of previous solutions and the latest achievements in science of criminal law and their application in comparative law.
Therefore, the paper analyses the basic postulates of the Criminal Code of
Serbia relating to the penalty system. The first part of the paper, which is at the
same time dedicated to introductory remarks, points to the dynamic stage in
which the criminal legislation of Serbia is at the moment, which is also characteristic for other European countries. Furthermore, it provides an overview of
the relevant provisions of the Criminal Code of Serbia, which entered into force
on 1 January 2006. For the purpose of a comprehensive approach, the analysis
also included solutions that are the result of amendments to the Criminal Code
in 2009 and 2012. The subsequent changes and amendments in 2013 and 2014
were not of importance for the penalty system. Special attention was paid to the
decades-long attempt to introduce into our criminal legislation sentence of life
imprisonment. Having regard to the need for argumentative and critical analysis of the several times proposed solution on the sentence of life imprisonment,
the aim is to evaluate the main pros and cons in regards to this sentence. By
examining the new provisions introduced with the aim of combating crime, but
also by taking a stance in respect of certain legal issues, the author gave suggestions de lege ferenda.Izlazi zajedničko izdanje sa časopisom "Crimen : časopis za krivične nauke", 2016,7, 3, ISSN 2217-219
Safety measure “Ban on Attendance at Certain Sporting Events” in practice of police and the judiciary
Get PDFZakonom o izmenama i dopunama Krivičnog zakonika
Republike Srbije iz 2009. godine, prvi put, u sistem krivičnih sankcija
uvedena je mera bezbednosti „zabrana prisustvovanja određenim
sportskim priredbama“.3 Ratio legis zakonodavca je bio efikasna
i intenzivna borba protiv nasilja na sportskim takmičenjima. U
ovom radu prikazaćemo, na primerima iz prakse, na koji način
se primenjuje ova mera bezbednosti, i koji su pozitivni, odnosno
negativni efekti ovakvog zakonskog regulisanja mera usmerenih
na suzbijanje nasilja na sportskim priredbama u Republici Srbiji.
Takođe, izvršićemo analizu sudskih presuda, donetih na teritoriji
Kolubarskog upravnog okruga od trenutka stupanja na snagu
ovog člana zakona do danas, kojima su izrečene mere bezbednosti
„zabrana prisustvovanja određenim sportskim priredbama“.
Analiziraćemo i načine (ne)izvršenja pojedinih sudskih odluka,
zbog mnogobrojnih objektivnih i subjektivnih razloga. Kroz rad
ćemo se posebno osvrnuti na postupanje policije, koja je zadužena
za praćenje izvršenje mera bezbednosti, odnosno obaveštavanje
suda o sprovođenju donetih presuda, kao i na reakciju suda na
obaveštenja da se njihove pravnosnažne odluke ne sprovode. Na kraju ćemo odgovoriti na postavljeno pitanje i zaključiti da li je
suzbijanje nasilja na sportskim priredbama efikasno u našem
pravnom sistemu.The Law Amending the Criminal Code of the Republic
of Serbia of 2009 has introduced for the first time the safety
measure “Ban on Attendance at Certain Sporting Events” in Serbian
criminal sanctions system. Ratio legis of the legislator was efficient
and intense fight against violence at sporting events. This paper will
present, using the practical examples, in which way this measure
is implemented, as well as what positive and negative effects are
of such a legal regulation of measures directed at suppression of
violence at sporting events in the Republic of Serbia. Also, we shall
analyze the court decisions reached in the territory of Kolubara
District from the moment when this Article of the Law came into
effect until today, which delivered the safety measure of “Ban on
Attendance at Certain Sporting Events”. We shall also analyze the
manners of carrying out or failures to carry out certain judicial
decisions due to many objective and subjective reasons. We shall
particularly give a review of the actions of the police, who are in
charge of monitoring the implementation of safety measures, i.e.
notifying the court on the implementation of the judicial decisions,
as well as of the response by the court to the notification that their
final judgments are not carried out. Finally, we shall answer the
question posed and conclude whether the suppression of violence
at sporting events is efficient within our legal system
Analysis of air pollution from point sources on the example of steel plant Smederevo
No full textAir pollution is one of the most significant problems which our country faces. Air pollution from point sources (boiler stacks, industrial plants…) is particularly important. It is surely of our interest to analyze the emission of pollutants from our only steel plant Smederevo. The most common pollutants which are emitted from these sources and occur by the combustion of coal are sulphur oxides, nitrous oxides, CO, dust and soot particles. Their spreading depends on metrological conditions and configuration of surrounding relief. The aim of this work is to represent the obtained air pollution distribution results from most common gases (SO2, NOx, CO), at different distances from the steel plant. Gaussian model for assessment the dispersion of gaseous materials and suspended particles has been used in the analysis. Model of American Environmental Protection Agency SCREEN 3 has been used for comparison of the influence which has one source in different work conditions on air quality. The complex coefficient of air pollution has also been analyzed
Kontrola i odgovornost u sistemu političkih institucija Evropske unije - osnovni izazovi i problemi
Get PDFThe paper analyzes the functioning of the political institutions control system within the European Union, especially the European Council as the most important political body of the EU. In particular, the author focuses on the major issues and challenges that may be observed in the process of establishing full legal and political accountability, not only of the European Council but also of other major bodies of the EU, as well as the key issues in establishing and preserving the essentially democratic character of the EU as a supranational political organization.U radu se analizira pitanje političke odgovornosti i kontrole najznačajnijih političkih institucija Evropske unije. Autor ukazuje najpre na osnovna značenja pojma politička odgovornost, a zatim na specifičnosti Evropske unije kao političkog sistema. U radu se daje analiza osnovnih nadležnosti i međusobnog odnosa Evropskog parlamenta, Evropskog saveta, Ministarskog saveta i Evropske komisije i to u kontekstu dva osnovna značenja političke odgovornosti - odgovornost političkih institucija pred građanima i odgovornost na relaciji egzekutiva-legislativa. Autor nastoji da ukaže na ključne probleme i izazove koji stoje na putu uspostavljanja pune političke odgovornosti i daje svoje mišljenje o osnovnim uzrocima krize demokratskog legitimiteta političkog sistema Evropske unije
Biometrijske aplikacije u bezbednosti vazdušnog transporta
Get PDFAs the number of air passengers continues to increase worldwide, so do the security demands and challenges in the air transport industry, particularly in lieu of numerous recent terrorist attacks. One of the essential requirements in fulfilling these needs resides in the accurate and timely identification of passengers and other participants in the air transport flow. Biometrics represents identification of individuals based on their quantifiable biological characteristics in automatic pattern recognition systems and is considered one of the most reliable means for personal identification. It is, therefore, not surprising that biometric technologies have an increasing presence in the air transportation industry. The intent of this review is to familiarize readers with biometric tools aimed at establishing and maintaining high security at airports and during flight, as well as to point out promising emerging biometric applications in the field.Sve veći broj putnika u vazdušnom saobraćaju, kao i sve učestaliji teroristički napadi, povećavaju bezbednosne zahteve i rizike u avio-industriji na globalnom nivou. Jedan od osnovnih uslova za povećanje bezbednosti jeste mogućnost precizne i brze identifikacije kako putnika, tako i drugih učesnika u saobraćajnom toku. Biometrija je oblast koja se bavi identifikacijom pojedinaca na osnovu njihovih merljivih, bioloških (anatomskih, fizioloških i ponašajnih) karakteristika u automatskim informacionim sistemima i smatra se jednim od najpouzdanijih pristupa za utvrđivanje identiteta. Stoga ne čudi što su biometrijske tehnologije danas sve prisutnije u avio-industriji. Cilj ovog rada je da upozna čitaoce sa dostupnim biometrijskim alatima koji se koriste za postizanje i održavanje visokog nivoa bezbednosti u vazdušnom saobraćaju. Autorka najpre daje pregled biometrijskih identifikacija koje se vrše na vazdušnim graničnim prelazima - aerodromima. U ovom kontekstu su, pored biometrijskih pristupa koji se koriste kao pooštrene mere bezbednosti, takođe obrađene i tehnologije koje imaju za cilj da povećaju brzinu prelaska granice i udobnost putnika niskog rizika, poput putnika koji često putuju (frequent flyers). Autorka dalje predstavlja načine na koje se, pomoću biometrijskih identifikacija, obavlja kontrola pristupa autorizovanih zaposlenih određenim zonama aerodroma, kao i provera prisustva osoba za kojima se traga. Kako skrining sistemi na aerodromima mogu imati visoke stope lažnih uzbuna, a sam proces skrininga predstavlja izazov, budući da zahteva proveru miliona pojedinaca u potrazi za svega nekoliko njih sa zlim namerama, autorka diskutuje o profilisanju putnika (bihevioralni skrining), kao savremenom pristupu identifikaciji pojedinaca na aerodromima, koji je u povoju, i koji je zasnovan na automatskom, biometrijskom prepoznavanju sumnjivih individua. Konačno, autorka predstavlja biometrijske aplikacije za identifikaciju pojedinaca tokom leta, koje se razvijaju u cilju obezbeđivanja putnika, posade i letelice. PR Projekat Ministarstva nauke Republike Srbije, br. TR34019 and the EU Commission project AREA, Contract No. 316004
Fundamental Preferences of the Phonon Engineering for Nanostructural Samples
No full textApplication of nano-structures requires a knowledge of their fundamental physical (mechanical, electromagnetic, optical, etc.) characteristics. Thermodynamic properties associated with phonon displacements through the nano-samples are particularly interesting. Independent of the type of lattices, the thermodynamics of their subsystems (electrons, excitons, spin waves, etc.) is determined when the subsystem is in thermodynamic equilibrium with phonons. Phonons are collective mechanical oscillations of molecules or atoms and represent the most important system of excitations. Besides, the acoustical characteristics as well as conductive and superconductive properties etc. could not be realistically explained without phonons. All quoted is well known and all applications of phonons in bulk structures have been intensively exploited for more than a century. The fact which must be especially pointed out is that the role of phonons in nanostructures is much more impressive than in bulk structures. The main fact concerning phonon properties in nanostructures is the absence of the so-called acoustic phonons, i.e., phonons whose energy tends to zero when phonon momentum tends to zero. For the exciting of phonons in nanostructures activation energy different from zero is necessary. These unexpected characteristics require revision of all conclusions obtained by bulk theories of phonons. Therefore, the contribution of phonon subsystems to thermodynamic and energy transfering analysis is the first step in a research of nanostructure properties. This paper describes a major aspect of the effort to understand nanostructures, namely the study of phonons and phonon-mediated effects in structures with nanoscale dimensional confinement in one or more spatial dimensions. During the last two decades, there has been a steady effort to understand the optical and acoustic phonons in nanostructures such as the superlattice, quantum wires, nanotubes and quantum dots. The central theme of this paper is the description of the acoustic phonons of the optical type in these nanostructures. As a preliminary to describing the dispersion relations and mode structures for phonons in nanostructures, phonon amplitudes are quantized in terms of the harmonic oscillator approximation, and anharmonic effects leading to phonon decay are described in terms of the dominant phonon decay channels. These elastic and discontinued models are applied to describe the deformation potential and interactions in a variety of nanostructures. Dependence of energy on the wave vector is highly nonlinear and linear approximation of the laws of dispersion of phonons in small size nanostructures makes no sense. Changing the phonon dispersion law due to confinement severely affects the kinetic effects conditioned by the interaction of acoustic phonons with electrons, dotted defects, phonon-phonon interactions. Managing transport properties of acoustic phonons through the modification of their energy spectrum in nanostructures was named phonon engineering. In this paper we will try to observe the difference between the characteristics of different nano-crystalline structures: ultrathin films, composite films, i.e., superlattices, nanorods and quantum dots, we were interested in whether the quantum size effects (quantum confinement), quantum (de) coherence and influence of boundary conditions, strengthen or weaken in nanosamples. Finally, this paper describes how the dimensional confinement of phonons in nanostructures leads to modifications in the electronic, optical, acoustic, superconducting and thermodynamic properties of quantum. Thermal properties of nanostructures have recently attracted a lot of attention. The influence of size effects on thermal conductivity is becoming extremely important for device design and reliability. The problem of thermal management is even more severe for photonic devices such as vertical cavity surface emitting lasers. On the other hand, to improve performance of thermoelectrics, one needs to achieve low thermal conductivity. These are two contradictory demands, but both can be approached with appropriate modification of phonon modes, e.g., phonon engineering. On the basis of the calculated dispersion law and distribution of phonon states in nanoscopis crystals, free energy and entropy will be calculated. Internal energy as well as heat capacitance will also be analyzed. Low-temperature behavior of these quantities will be compared to the corresponding ones of bulk-structures. It was shown that heat capacitances of nano-layered structures in low-temperature region were higher than the same quantities of the corresponding bulk sample. In the middle and the highest temperature region, temperature behavior was inverse: heat capacitance of layered structures was lower than of the corresponding bulk ones. The consequences were discussed with relation to the better superconductive properties of nanomaterials
Uticaj zaposlenosti na spremnost građana za reagovanje na prirodnu katastrofu izazvanu poplavom
Get PDFConsequences of floods that affected the territory of Serbia in 2014 indicated a very low level of preparedness of population to respond to natural disasters. Therefore, the aim of quantitative research is to examine the impact of fear on the willingness of citizens to respond to a natural disaster caused by the flood in the Republic of Serbia. Bearing in mind all local communities in Serbia where floods occurred or where there is a high risk of flooding, the sample was randomly selected consisting of 19 of 150 municipalities and 23 towns and the city of Belgrade. The survey used the strategy of testing in households with the use of a multi-stage random sample. The research results show that the citizens who are employed, in a higher percentage/to a greater extent compared to citizens who are not have taken certain preventive measures aimed at reducing the tangible consequences of floods, would pay funds to an account to help flood victims, would engage in providing help to flood victims in the field, heavy rains make them think of preparedness for response and water level rise, they engaged in preparations for at least 6 months, do not do anything that would raise the level of preparedness to the next level, etc. The originality of the research lies in the fact that in Serbia the research has never been conducted to examine the state of preparedness of citizens to respond. Bearing in mind that the research is based on the territory of Serbia, the conclusions can be generalized to the entire population. The research results can be used when creating a strategy for improving the level of preparedness of citizens to respond.Posledice poplava koje su zadesile područje Srbije u toku 2014. godine ukazale su na veoma nizak stepen spremnosti stanovništva za reagovanje u takvim prirodnim katastrofama. Cilj kvantitativnog istraživanja predstavlja ispitivanje uticaja zaposlenosti na spremnost građana za reagovanje na prirodnu katastrofu izazvanu poplavom u Republici Srbiji. Imajući u vidu sve lokalne zajednice u Srbiji u kojima se dogodila ili postoji visok rizik da se dogodi poplava, metodom slučajnog uzorka odabrano je 19 od ukupno 150 opština, 23 grada i grada Beograda. U samom anketnom ispitivanju u kojem je učestvovalo 2.500 građana bila je primenjena strategija ispitivanja u domaćinstvima uz primenu višeetapnog slučajnog uzorka. Originalnost istraživanja ogleda se u činjenici da u Srbiji nikada nije sprovedeno istraživanje kojim bi se ispitalo stanje spremnosti građana za reagovanje. Rezultati istraživanja se mogu iskoristiti prilikom kreiranja strategija za unapređenje nivoa spremnosti građana za reagovanje s obzirom na njihovu zaposlenost. Istraživanje ukazuje na koji način treba uticati na građane s obzirom na status zaposlenosti kako bi se spremnost podigla na viši nivo