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2025 research outputs found
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Visualization of latent fingerprints by electrochemical deposition of metallic thin films
No full textA simple and effective approach for visualizing latent fingerprints on different
conductive substrates was proposed. The fingerprint residue acted as an insulating mask
so it was possible to achieve selective electrochemical deposition of copper and nickel
thin films between fingerprint ridges. Thin rectangular pieces of copper, brass and
stainless steel foil were chosen for the substrates as materials of relevance to the forensic
investigation. Influence of different substrates conditions (roughness, cleanliness)
and influence of different deposition parameters (current density, electrodeposition
time, concentration of additives) on the film microstructure, adhesion between the
film and the substrate and quality of latent fingerprints visualization were investigated.
All fingerprints originated from the same donor. The best results were obtained by
applying 50 mA/cm2 current density for a period of 30 s, with the mean thickness of
the nickel and copper films of about 0.5 μm. The quality of the developed fingerprints
was estimated visually and by optical (metallographic) microscopy. It is possible to
achieve the satisfactory results of latent fingerprint visualization on rough and dirty
surfaces. Electrochemical deposition technique is also applicable for the visualization
of latent fingerprints that have been changed by aging
Primena informaciono-komunikacionih tehnologija u preduzećima u Srbiji
Get PDFIn this paper, we analyse the usage of information and communication technologies (ICT) in enterprises in Serbia. The analysis is based on the data generated from the statistical survey of the Statistical Office of the Republic of Serbia for 2016 (ICT Usage - Enterprises) and on the Eurostat data on the usage of ICT in enterprises in the EU Member States (EU-28). We observed the following indicators of the usage of ICT: fixed broadband access, speed of Internet connections, employment of ICT specialists, Internet presence (enterprises having a website), use of social media, use of cloud computing services, enterprises engaged in e-commerce (percentage of enterprises and share of online sales in total turnover). Based on these indicators, the comparison with the EU Member States has been made. It has been found that the accomplished level of the usage of ICT in enterprises in the Republic of Serbia is above the European average, yet still below the level of the developed EU economies. When cloud computing services and the development of web-based sales are considered, Serbia still lags behind the EU Member States.U radu je analizirana primena informaciono-komunikacionih tehnologija (IKT) u preduzećima u Srbiji. Analiza je zasnovana na podacima Republičkog zavoda za statistiku za 2016. godinu koji se dobijaju statističkim istraživanjem 'Upotreba informaciono-komunikacionih tehnologija u privrednim društvima' i na podacima Eurostat-a o primeni IKT u preduzećima u zemljama članicama Evropske unije (EU-28). Posmatrani su sledeći indikatori upotrebe IKT: širokopojasna internet konekcija, brzina internet konekcije, zapošljavanje IKT stručnjaka, prisustvo na internetu (posedovanje vebsajta), korišćenje društvenih medija, korišćenje usluga cloud računarstva, pokazatelji elektronske trgovine (procenat preduzeća koja učestvuju u elektronskoj trgovini i učešće e-trgovine u ostvarenom prometu). Na osnovu ovih indikatora, izvršeno je poređenje sa zemljama Evropske unije. Ocenjeno je da je dostignut nivo u primeni IKT u preduzećima u Srbiji iznad evropskog proseka, mada još uvek ne na nivou razvijenih evropskih ekonomija, naročito kada je u pitanju korišćenje usluga cloud računarstva i razvoj elektronske trgovine, u kojima Srbija još uvek zaostaje za evropskim zemljama
Religiousness level and citizen preparedness for natural disasters
Get PDFThe subject of quantitative research was examination of relationship between the level of religiousness and perception of citizen's flood disaster preparedness. The aim of such research was a scientific explanation of relationships of these characteristics and the perception. Bearing in mind all local communities in Serbia, where floods occurred or there is a high risk of flooding, the sample including 19 of 150 municipalities and 23 towns was randomly selected, as well as the city of Belgrade, where 2,500 persons were surveyed in 2015. The research included the following communities: Obrenovac, Šabac, Kruševac, Kragujevac, Sremska Mitrovica, Priboj, Batočina, Svilajnac, Lapovo, Paraćin, Smederevska Palanka, Jaša Tomić, Loznica, Bajina Bašta, Smederevo, Novi Sad, Kraljevo, Rekovac and Užice. The research of selected communities was undertaken in the areas which were most affected in relation to the amount of water or potential risk of flooding. The survey used strategy of testing in households with the use of a multistage random sample. The parts in the administrative headquarters, which were threatened by hundred-year-old water or a potential risk of high water were determined in the first stage. In the second stage streets and their parts were established, and in the third stage the households in which the survey was conducted were determined. The number of households was coordinated with the size of the community. The fourth stage of sampling referred to the procedure of respondent selection within previously defined household. The respondent selection was conducted using a random sampling method on the adult household members, who were present at the time of the survey. The results indicate that there is a statistically significant correlation level of religiosity with perception in terms of citizens' preparedness to respond. The research results can contribute to the improvement of citizens' preparedness to respond to such events and can be used to develop the strategy for enhancement of the level of citizens' preparedness to respond
Different regions of exciton localized states in ultrathin dielectric films
No full textThis paper presents the results of research conducted in the field of confinement effects in ultrathin dielectric films. Method of choice is the method of Green's functions which proved to be a very powerful tool for theoretical research in solid state physics. Among many other properties of materials, such as optical, conductive, etc. with this method it is possible to obtain critical values of boundary parameters corresponding to all transitions from bulk to localized exciton states. This research is valid for four layered crystalline film, since that type of ultrathin structure was the object of research. Conditions for occurrence of one, two, three, or even four localized states have been found and analyzed and regions with equal number of localized states have been defined. This corresponds to the process of reconstruction of the energy spectra of excitons in quasi 2D nanostructures with respect to those in corresponding bulk-structures
Dragoslava Mićović: Žene policajci kroz jezik srpske policijske periodike (1910-2016), Zadužbina Andrejević, Beograd, 2017
Get PDFUse of Gaussian mathematical model in the distribution of sulphur dioxide into the atmosphere from point source
Get PDFThis study analyses the condition and quality of the environment which is endangered by typical pollutants present in urban areas. The main sources of air pollution are power sector (mostly power plants), transport sector (motor vehicles) and industrial plants. Among these substances the most common and most harmful to human health and biological systems is sulphur dioxide. The effects of sulphur dioxide are sensed very easily, most people experience the symptoms after 10 divided by 15 minutes. Therefore the concentration of sulphur dioxide in the air is taken as a referent parameter for the assessment of air quality and evaluation of air pollution. In this study the metallurgy plant which processes 1000 tons of copper-chalcopyrite ore daily is analysed as the illustrative example. By using Gaussian mathematical model the distribution of ground concentration of sulphur dioxide is analysed for the different heights of chimneys and different emissions in stable and unstable atmospheric conditions. Calculation of distribution and spreading of sulphur dioxide covers the period of 24 hours after the release into the atmosphere. The results are compared with the legally permissible limit value concentrations.U radu se analizira stanje i kvaliteta okoliša kojeg ugrožavaju postojeći tipični zagađivači urbanih predjela. Glavni izvori zagađenja zraka su sektor
energije (uglavnom energane), transporta (motorna vozila) i industrijski pogoni. Među najčešćim i najškodljivijim za ljudsko zdravlje i biološke sustave
je sumporni dioksid. Djelovanje sumpornog dioksida osjeća se vrlo lako i većina ljudi osjeća simptome već nakon 10÷15 minuta. Stoga se koncentracija
ugljičnog dioksida u zraku uzima kao referentni parameter u procjeni kvalitete zraka i njegovog zagađenja. U radu se kao ilustrativni primjer analizira
metalurški pogon koji dnevno prerađuje 1000 tona rude bakra-halkopirita. Primjenom Gausova matematičkog modela analizira se raspodjela koncentracije
sumpornog dioksida na zemlji kod dimnjaka raznih visina i različitih količina ispuštanja u stabilnim i nestabilnim vremenskim uvjetima. Distribucija i
širenje sumpornog dioksida izračunati su za razdoblje od 24 sata nakon ispuštanja u atmosferu. Rezultati su uspoređeni s legalno dopuštenim
koncentracijama graničnih vrijednost
Diffusion of phonons through (along and across) the ultrathin crystalline films
No full textInstead of usual approach, applying displacement-displacement Green's functions, the momentum-momentum Green's functions will be used to calculate the diffusion tensor. With this type of Green's function we have calculated and analyzed dispersion law in film-structures. A small number of phonon energy levels along the direction of boundary surfaces joint of the film are discrete-ones and in this case standing waves could occur. This is consequence of quantum size effects. These Green's functions enter into Kubo's formula defining diffusion properties of the system and possible heat transfer direction through observed structures. Calculation of the diffusion tensor for phonons in film structure requires solving of the system of difference equations. Boundary conditions are included into mentioned system through the Hamiltonian of the film-structure. It has been shown that the diagonal elements of the diffusion tensor express discrete behavior of the dispersion law of elementary excitations. More important result is that they are temperature independent and that their values are much higher comparing with bulk structures. This result favors better heat conduction of the film, but in direction which is perpendicular to boundary film surface. In the same time this significantly favors appearance 2D superconducting surfaces inside the ultra-thin crystal structure, which are parallel to the boundary surface
Glavni pretres prema novom Zakoniku o krivičnom postupku - istraživanje u praksi
Get PDFThe main hearing is the central part of the criminal procedure. In Serbia, the reform of the national criminal procedure legislation has brought about numerous changes related to this stage of criminal proceedings. Numerous objections have been addressed to the almost entirely new legal text. In an attempt to examine the advantages and disadvantages of the new legislation and observe how the prescribed rules are applied in practice, the authors have conducted an empirical research by attending 205 main hearings which were conducted under the rules of the new Criminal Procedure Code. The research covers a huge number of related issues but, given the page limit, this paper will focus on individual issues observed in trial proceedings. The focal point of reference is the examination of witness, but the authors also consider a number of other issues: the examination of expert witness, the delay of the trial, and the use of a video-link as a novelty introduced owing to the technological achievements of the modern era. The article is organized into several parts. The authors first provide a theoretical background of the issue under consideration and, then, present and discuss the research results provided in tables. In the third part of the article, the authors draw specific conclusions about the current practice in trials proceedings.Glavni pretres predstavlja centralni deo krivičnog postupka. Reformom krivičnog procesnog zakonodavstva u Srbiji unete su, između ostalog, i brojne promene kada je u pitanju ova faza krivičnog postupka. Gotovo celokupnom novom zakonskog tekstu upućene su brojne primedbe. Usleg toga, autori su izvršili istraživanje prateći 205 glavnih pretresa koji su održani po pravilima novog Zakonika o krivičnom postupku, pokušavajući da sagledaju prednosti i nedostatke, te kako se pravila primenjuju u praksi. Budući da je za obim rada bilo izuzetno teško obraditi sva pitanja, autori su se bazirali na pojedina pitanja na glavnom pretresu. Akcenat je stavljen na ispitivanje svedoka, ali nisu zanemarena ni pitanja veštačenja, odlaganja glavnog pretresa, te upotrebe video-linka, kao novine zahvaljujući tehničkim dostignućima savremenog doba. Autori rad dele u više celina, teoretski obrazlažući pitanje o kojem se bave, a potom tabelarno predstavljajući rezultate istraživanja. Na osnovu toga, na kraju rada izvode konkretne zaključke o dosadašnjoj praksi vođenja glavnih pretresa
Тематски зборник радова. Том 2 : Научно-стручни скуп са међународним учешћем Полиција и правосудни органи као гаранти слободе и безбедности у правној држави, Тара, 23-25. мај 2017. године
Get PDFТематски зборник под насловом „Полиција и правосудни органи као га-ранти слободе и безбедности у правној држави“ представља резултат ис-тоименог научно-стручног скупа са међународним учешћем који се, у су-организацији Криминалистичко-полицијске академије у Београду, Правног факултета Универзитета у Крагујевцу и Фондације Ханс Зајдел, а уз подрш-ку Министарства унутрашњих послова Републике Србије и Министарства просвете, науке и технолошког развоја Републике Србије, одржава од 23. до 25. маја 2017. године на Тари
The crime of torture : de lege lata and de lege ferenda
Get PDFУ раду се анализира кривично дело мучења из члана 137 КЗ. Аутор најпре даје неке терминолошке напомене и
указује да је забрана мучења прокламована многобројним међународним документима. С обзиром да је мучење као кривично дело уведено у наше кривично законодавство као резултат
усаглашавања са Конвенцијом против тортуре и других сурових, нехуманих и или понижавајућих казни и поступака коју је
усвојила Генерална скупштина Уједињених УН и Конвенцијом
о спречавању мучења, нечовечних и понижавајућих поступака
и кажњавања Савета Европе, посебна пажња посвећена је анализи појединих одредби тих докумената. Аутор скреће пажњу
да јединствена дефиниција мучења не постоји ни на међународном ни на регионалном плану, али да је на основу текстова
различитих конвенција, као и судске праксе Европског суда за
људска права (ЕСЉП), могуће издвојити три основна елемента
битна за његово постојање: наношење великог бола или тешких патњи (физичких или психичких); битно је да се то чини са
умишљајем; и сa посебним циљем, нпр: добијање информација,
застрашивање и сл. Централни део рада представља анализа
елемената бића кривичног дела мучења из Кривичног законика,
након које аутор даје конкретне предлоге de lege ferenda.The paper analyses torture as a crime defined by Article
137 of the Criminal Code. The author first gives some terminological remarks and suggests that prohibition of torture is proclaimed
by numerous international documents. Considering that torture as a
crime has been introduced into our criminal legislation as a result of
harmonization with the Convention against Torture and Other Cruel,
Inhuman or Degrading Treatment or Punishment which was adopted
by the UN General Assembly and the Council of Europe Convention on Prevention of Torture, Inhuman and Degrading Treatment and
Punishment, special attention has been given to the analysis of certain provisions of these documents. The author underlines that there
is not a uniform definition of torture at international and regional level, however, based on the texts of various conventions, as well
as based on the practice of the European Court of Human Rights
(ECHR) it is possible to single out three basic elements important
for its existence: causing serious bodily or mental harm; it is important that it is committed with malice; and that it is committed with
a particular goal, for instance to get information, to intimidate, and
similar. The central part of the paper is the analysis of the elements
of the subject matter of torture as a crime stipulated by the Criminal
Code followed by the concrete proposals de lege ferenda