Interactions of charged particles with double-layer graphene

Nowadays we are witnesses of a development of one promising branch of applied physics, called plasmonics. Especially interesting issue is plasmonics in quasi-two-dimensional (q2D) crystals deposited on various dielectric substrates. Here arise the main questions: how to increase the 2D plasmon propagation length and how to excite 2D plasmon most efficiently. We will focus on describing the interaction between electronic excitations in two graphene layers with phonons in aluminium oxide (Al2O3) slab on which the graphene layers are deposited. Special attention will be paid to explain the hybridization between 2D plasmons and surface (TO) phonons. Because of multiple intersections of 2D plasmons and TO phonons the 2D plasmon moves to lower energies which allows it to be excited by charged particles moving at subthreshold speeds, [1]. We will present the results for wake potential induced by a charged particle which moves parallel to the graphene/dielectric interface. It will be shown how various substrates modify the efficiency of particle/plasmon coupling. The electronic excitations in graphene are obtained by using plane waveab initio approach where we have addressed the problem of calculation of EELS spectra in the optical limit ( → 0) and how to avoid intersupercell Coulomb interaction [2].28th Summer School and International Symposium on the Physics of Ionized Gases - SPIG 2016, August 29 - September 2, 2016, Belgrad

Modular Wavemaker Design for Harbours and Ships Physical Model Testing

The paper presents design and implementation of a portable modular wavemaker system for producing regular and irregular waves in laboratory basins and fl umes. The system was built for the purpose of testing the impact of the sea waves on ships and coastal facilities. It is suitable for generation of all tipes regular and irregular surface waves. Modular system structure maintains high degree of fl exibility and reusability. Finally, the testing process on the physical model of Split harbour is described, and the currently obtained results are shown

Wake effect due to excitation of plasmon-phonon hybrid modes in a graphene-sapphire-graphene structure by a moving charge

We study the wake effect due to excitation of a plasmon-phonon hybrid mode in a sandwich-like structure consisting of two doped graphene sheets, separated by a layer of Al2O3 (sapphire), which is induced by an external charged particle moving parallel to the structure.29th Summer School and International Symposium on the Physics of Ionized Gases - SPIG 2018, August 28 - September 1, 2018, Belgrade

Experimental analysis of dental-implant load transfer in polymethyl-methacrylate blocks

Dental-implant overload can cause bone resorption. Load-transfer characteristics of dental implants are affected by their macro-design parameters. The goal of this study was to experimentally analyse the load-transfer characteristics of different dental implants, using polymethyl-methacrylate blocks. Three polymethyl-methacrylate blocks were created, with dimensions of (68 x 25 x 9) mm. Three dental implants, Nobel empty set3.5 mm x 15 mm, Strauman empty set4.1 mm x 10 mm and Strauman empty set4.8 mm x 12 mm. were placed in separate blocks. The samples were supported by a three-point-bending set-up and loaded with an axial force of 600 N. The 3D digital image correlation method was employed for strain and displacement measurements. The highest displacement and von Mises strain values were found for Strauman empty set4.1 mm x 10 mm (p lt 0.05), 0.186 mm and 0.596 %, respectively. The sample of Nobel empty set3.5 mm x 15 mm showed the lowest strain values. The sample of Strauman empty set4.8 mm x 12 mm (p > 0.05) had similar strain values as Nobel empty set3.5 mm x 15 mm. The load transfer during axial loading was primarily affected by the size of the implant contact surface. The displacement and strain values in the implant vicinity may provide an insight into the effect of dental-implant design on the load transfer

Mobile applications as a promotional tool of a tourist offer in protected areas

The rapid development of information and communications technology (ICT) in recent decades has resulted not only in drastic increase in speed of the information flow, but also in the number of users of mobile devices. This trend has been recognized and used by many industries, including tourism. The use of specialized application software, compatible with the modern 'smartphones', the interaction between tourists and tourist destinations received a whole new dimension. This article aims at analyzing the ways in which the two seemingly incompatible concepts - tourism in protected nature and advanced communication technologies - can complement each other in order to create, improve and promote ecotourism products. Furthermore, it will analyze the latest trends in the development of mobile applications used in tourism industry and present examples of good practice in protected areas in Serbia and abroad. Due to the fact that mobile applications and technological innovations are relatively new and so far very few re­searchers have involved in the research of their effects on the users' satisfaction and their behavior, this paper will give guidelines for future research on this topic

FETAL CARDIAC SCREENING IN PROTECTION FROM PERINATAL MORTALITY AND MORBIDITY – THE NEW, VERY IMPORTANT ROLE OF FETAL ECHOCARDIOGRAPHY IN OBSTETRICS AND PEDIATRIC CARDIOLOGY

Cilj: Osnovni je cilj ovog pregleda istaknuti vrijednost fetalnog kardiološkog probira (FKP) u zaštiti perinatalnog morbiditeta i mortaliteta uzevši u obzir suvremene dijagnostičke i terapijske mogućnosti i nova znanstvena otkrića. Istaknute su indikacije za FKP prema stupnju rizika, kako tablično tako i u opsežnoj raspravi koja uvažava timski rad i interpretira nalaz uzimanjem u obzir klasičnih smjernica stručnih društava (engl. Classical of recommendations - COR) i rasprave o bolesniku zasnovane na dokazima (engl. Level of evidence - LOE). Metode i rezultati izvedeni su proučavanjem smjernica stručnih društava za fetalnu pedijatrijsku kardiologiju: American Heart Association – AHA, Asociation of European Pediatric Cardiology – AEPC), International Society of Ultrasound in Obstetrics and Ginecology – ISOUG) te druge opsežne novije literature. Ističu se interesi fetalne kardiološke medicine uključujući dijagnozu prirođenih srčanih bolesti i aritmija, procjenu funkcije fetalnog kardiovaskularnog sustava (KVS) i raspoložive metode intrauterinog liječenja, kao i moguću potrebu neposredne ili vrlo rane intervencije nakon porođaja. Opsežnom raspravom uz brojne literaturne citate i tabličnim prikazom istaknute su referalne indikacije za FKP, čimbenici koji povećavaju rizik od prirođenih srčanih grješaka (PSG) i drugih srčanih bolesti (aritmije i kardiomiopatije) te populacijski pregled ekstrakardijalnih anomalija (EKA) koje imaju visok posljedični rizik za pridruženu srčanu bolest. Tekstu je uz tablice priloženo nekoliko važnih crteža ili ehokardiografskih prikaza koji na svoj način prožimaju zajedničke nalaze opstetričara i pedijatrijskog kardiologa-fetologa. Na kraju su istaknuta istraživanja koja dokazuju kako primjena i uvažavanje fetalnog kardiološkog probira pozitivno utječe na smanjenje perinatalnog morbiditeta i mortaliteta, posebno na primjeru složenih PSG. Zaključak: U posljednjih 20 godina fetalna kardiološka medicina je tako uznapredovala u dijagnostičkom i terapijskom smislu da značajno utječe na ukupni perinatalni morbiditet i mortalitet, osobito stoga što su PSG najčešće kongenitalne anomalije. Precizna kardiološka fetalna dijagnostika, sve brojniji terapijski pristupi u fetalno srce, kako medikamentni tako i intervencijski te dinamičan razvoj novih tehnologija doveli su fetalnu kardiološku medicinu do razine bez koje se više ne može zamisliti suvremena medicina u jednoj zemlji.Objective: The main objective of this review is to highlight the value of fetal cardiac screening in the protection from perinatal morbidity and mortality by respecting modern scientifi c, diagnostic and therapeutic possibilities. Indications for fetal cardiac screening according to the level of risk are highlighted, both tabularly and in an extensive discussion that takes into account teamwork and interprets fi ndings by taking into account Class of Recommendation (COR) and evidence-based patient discussions, Level of Evidence (LOE). Methods and results are derived from studying the guidelines of the American Heart Association (AHA), Association of European Pediatric Cardiology (AEPC), International Society of Ultrasound in Obstetrics and Gynecology (ISOUG), and other extensive recent literature. The aim is to highlight the interests of fetal cardiac medicine, including the diagnosis of congenital heart disease (CHD) and arrhythmias, assessment of fetal cardiovascular function and available methods of intrauterine treatment, as well as of immediate or early postnatal intervention. Extensive discussion with numerous literature citations and tabular presentation highlights the referral indications for fetal cardiac screening (FCS), factors that increase the risk of CHD and other heart diseases (arrhythmias and cardiomyopathies), and a population overview of extracardiac abnormalities associated with heart diseases. Along with the inevitable tables, the text is accompanied by several important drawings or echocardiographic representations that in their own way permeate the joint fi ndings of obstetricians and pediatric cardiologists-fetologists. Research confi rming that the application and consideration of fetal cardiac screening has a positive effect on reducing perinatal morbidity and mortality, especially in the case of complex heart defects, is presented at the end. Conclusion: In the last 20 years, fetal cardiac medicine has advanced so much in diagnostic and therapeutic terms that it signifi cantly affects overall perinatal morbidity and mortality, especially because CHDs are the most common congenital anomalies. Accurate cardiac fetal diagnosis, increasing therapeutic approaches to the fetal heart, both medical and interventional, and dynamic development of new technologies have brought fetal cardiac medicine to a level without which modern medicine in any country can no longer be imagined

FETAL CARDIAC SCREENING IN PROTECTION FROM PERINATAL MORTALITY AND MORBIDITY – THE NEW, VERY IMPORTANT ROLE OF FETAL ECHOCARDIOGRAPHY IN OBSTETRICS AND PEDIATRIC CARDIOLOGY

Cilj: Osnovni je cilj ovog pregleda istaknuti vrijednost fetalnog kardiološkog probira (FKP) u zaštiti perinatalnog morbiditeta i mortaliteta uzevši u obzir suvremene dijagnostičke i terapijske mogućnosti i nova znanstvena otkrića. Istaknute su indikacije za FKP prema stupnju rizika, kako tablično tako i u opsežnoj raspravi koja uvažava timski rad i interpretira nalaz uzimanjem u obzir klasičnih smjernica stručnih društava (engl. Classical of recommendations - COR) i rasprave o bolesniku zasnovane na dokazima (engl. Level of evidence - LOE). Metode i rezultati izvedeni su proučavanjem smjernica stručnih društava za fetalnu pedijatrijsku kardiologiju: American Heart Association – AHA, Asociation of European Pediatric Cardiology – AEPC), International Society of Ultrasound in Obstetrics and Ginecology – ISOUG) te druge opsežne novije literature. Ističu se interesi fetalne kardiološke medicine uključujući dijagnozu prirođenih srčanih bolesti i aritmija, procjenu funkcije fetalnog kardiovaskularnog sustava (KVS) i raspoložive metode intrauterinog liječenja, kao i moguću potrebu neposredne ili vrlo rane intervencije nakon porođaja. Opsežnom raspravom uz brojne literaturne citate i tabličnim prikazom istaknute su referalne indikacije za FKP, čimbenici koji povećavaju rizik od prirođenih srčanih grješaka (PSG) i drugih srčanih bolesti (aritmije i kardiomiopatije) te populacijski pregled ekstrakardijalnih anomalija (EKA) koje imaju visok posljedični rizik za pridruženu srčanu bolest. Tekstu je uz tablice priloženo nekoliko važnih crteža ili ehokardiografskih prikaza koji na svoj način prožimaju zajedničke nalaze opstetričara i pedijatrijskog kardiologa-fetologa. Na kraju su istaknuta istraživanja koja dokazuju kako primjena i uvažavanje fetalnog kardiološkog probira pozitivno utječe na smanjenje perinatalnog morbiditeta i mortaliteta, posebno na primjeru složenih PSG. Zaključak: U posljednjih 20 godina fetalna kardiološka medicina je tako uznapredovala u dijagnostičkom i terapijskom smislu da značajno utječe na ukupni perinatalni morbiditet i mortalitet, osobito stoga što su PSG najčešće kongenitalne anomalije. Precizna kardiološka fetalna dijagnostika, sve brojniji terapijski pristupi u fetalno srce, kako medikamentni tako i intervencijski te dinamičan razvoj novih tehnologija doveli su fetalnu kardiološku medicinu do razine bez koje se više ne može zamisliti suvremena medicina u jednoj zemlji.Objective: The main objective of this review is to highlight the value of fetal cardiac screening in the protection from perinatal morbidity and mortality by respecting modern scientifi c, diagnostic and therapeutic possibilities. Indications for fetal cardiac screening according to the level of risk are highlighted, both tabularly and in an extensive discussion that takes into account teamwork and interprets fi ndings by taking into account Class of Recommendation (COR) and evidence-based patient discussions, Level of Evidence (LOE). Methods and results are derived from studying the guidelines of the American Heart Association (AHA), Association of European Pediatric Cardiology (AEPC), International Society of Ultrasound in Obstetrics and Gynecology (ISOUG), and other extensive recent literature. The aim is to highlight the interests of fetal cardiac medicine, including the diagnosis of congenital heart disease (CHD) and arrhythmias, assessment of fetal cardiovascular function and available methods of intrauterine treatment, as well as of immediate or early postnatal intervention. Extensive discussion with numerous literature citations and tabular presentation highlights the referral indications for fetal cardiac screening (FCS), factors that increase the risk of CHD and other heart diseases (arrhythmias and cardiomyopathies), and a population overview of extracardiac abnormalities associated with heart diseases. Along with the inevitable tables, the text is accompanied by several important drawings or echocardiographic representations that in their own way permeate the joint fi ndings of obstetricians and pediatric cardiologists-fetologists. Research confi rming that the application and consideration of fetal cardiac screening has a positive effect on reducing perinatal morbidity and mortality, especially in the case of complex heart defects, is presented at the end. Conclusion: In the last 20 years, fetal cardiac medicine has advanced so much in diagnostic and therapeutic terms that it signifi cantly affects overall perinatal morbidity and mortality, especially because CHDs are the most common congenital anomalies. Accurate cardiac fetal diagnosis, increasing therapeutic approaches to the fetal heart, both medical and interventional, and dynamic development of new technologies have brought fetal cardiac medicine to a level without which modern medicine in any country can no longer be imagined