Dispersion Interactions between Optically Anisotropic Cylinders at all Separations: Retardation Effects for Insulating and Semiconducting Single Wall Carbon Nanotubes

We derive the complete form of the van der Waals dispersion interaction between two infinitely long anisotropic semiconducting/insulating thin cylinders at all separations. The derivation is based on the general theory of dispersion interactions between anisotropic media as formulated in [J. N. Munday, D. Iannuzzi, Yu. S. Barash and F. Capasso, {\sl Phys. Rev. A} {\bf 71}, 042102 (2005)]. This formulation is then used to calculate the dispersion interactions between a pair of single walled carbon nanotubes at all separations and all angles. Non-retarded and retarded forms of the interactions are developed separately. The possibility of repulsive dispersion interactions and non-monotonic dispersion interactions is discussed within the framework of the new formulation

The relationship of public investments in science and scientometric indicators from the perspective of Croatian universities

Aim: This study addresses the hypothesis that the investments in science are positively correlated with the indicators of productivity and performance of the universities. Methods: A cross-sectional design was used with the data from 27 EU countries. The percentage of GDP invested in science in higher education in 2019 and investments expressed as €/inhabitant were used. The criterion variables were total number of publications in Web of Science for 2020; number of publications categorized as article, review or note (ARN); change in the number of publications compared to 2016 in total and for Organisation for Economic Co-operation and Development (OECD) research areas; productivity per inhabitant; productivity per researcher; productivity per researcher in higher education system; and number of Academic Ranking of World Universities (ARWU) TOP1000 universities per inhabitant. Descriptive data and Pearson and Spearman correlations were calculated. Additionally, partial Spearman correlations for detailed examinations were used. Results: Most of the productivity indicators were positively correlated to the investment in science. The absolute investment in science in €/inhabitant is more important than investment expressed as the percentage of GDP. Unexpectedly, the correlations between investments and the growth rate in productivity were negative indicating that the less developed countries have achieved a larger growth in productivity in the examined 5-year period. Conclusion: The results indicate that the investments in science as the percentage of GDP is important, but the absolute amount of money also has an important role in the prediction of scientific productivity. However, since the absolute amount of investments is limited in the less developed countries, they should be more focused on building the strategies that capitalize on specific strengths and potentials. This further accentuates the need for science policy change in Croatia with the strategic focus on aligning the resources to the expected results

Is adhesion superficial? Silicon wafers as a model system to study van der Waals interactions

Adhesion is a key issue for researchers of various fields, it is therefore of uppermost importance to understand the parameters that are involved. Commonly, only surface parameters are employed to determine the adhesive forces between materials. Yet, van der Waals forces act not only between atoms in the vicinity of the surface, but also between atoms in the bulk material. In this review, we describe the principles of van der Waals interactions and outline experimental and theoretical studies investigating the influence of the subsurface material on adhesion. In addition, we present a collection of data indicating that silicon wafers with native oxide layers are a good model substrate to study van der Waals interactions with coated materials

Application for management and issuance of warehouse items

Završni rad bavi se izradom Web aplikacije za upravljanje i izdavanje skladišnih artikala uz pomoć RFID tehnologije. Pozadinski dio aplikacije (engl. backend) napravljen je u PHP programskom jeziku, a za vidljivi dio (engl. frontend) korištena je HTML, CSS, Javascript i Jquery tehnologija. Za pohranu podataka aplikacija koristi MYSQL bazu podataka te HTTP poslužitelj Apache. Primarni cilj sustava je izdavanje i praćenje zauzetosti pojedinih skladišnih artikala. Administrator aplikacije na zahtjev korisnika izdaje artikl na određeni rok. Sustav prati sve artikle te na jednostavan i intuitivan način prikazuje status artikla. Izdavanje i vraćanje artikala moguće je raditi ručno ili korištenjem RFID čitača. Svakom artiklu prilikom unosa dodjeljuje se oznaka (engl. tag) koja jedinstveno identificira artikl te omogućuje brzo i jednostavno prepoznavanje istog. Oznaka se može očitavati uz pomoć RFID čitača koji očitane podatke šalje prema aplikaciji. Aplikacija provjerava podatke te prema zadanoj naredbi izdaje ili vraća artikl. Administrator ima mogućnost dodavanja novih, uređivanje i brisanje postojećih korisnika, kreiranje, uređivanje i brisanje artikala te izdavanje, vraćanje i produživanje roka izdanim artiklima. Za kostur (engl. framework) aplikacije korišten je Codeigniter koji koristi MVC (ModelView-Controller) uzorak. MVC koncept omogućuje izoliranje programske logike i korisničkog sučelja te omogućava lakše održavanje i nadograđivanje aplikacije. Korištenjem kostura poput Codeignitera povećavamo sigurnost same aplikacije zbog ugašenih sigurnosnih mjera protiv CRSF (engl. Cross-site request forgery) i XSS (engl. Cross-site scripting) napada. Prednost Web aplikacije nad Desktop aplikacijom krije se u njezinoj mobilnosti. Aplikacija je dostupna na svim računalima i mobilnim uređajima sa internet pristupom i preglednikom. Prilagodljivost aplikacije omogućava upotreba Bootstrap tehnologije koja korisničko sučelje Web aplikacije prilagođava na osnovi veličine ekrana uređaja. Gotova aplikacija postavljena je na server na adresi: http://fluentinventory.t

DIFFERENCES IN THE SELF-REPORTED ONE-YEAR PREVALENCE OF PARENTAL VIOLENCE EXPERIENCED BY ADOLESCENTS IN 2011 AND 2017

U ovom radu cilj je pokazati promjene u izloženosti adolescenata u jednogodišnjoj prevalenciji doživljenog roditeljskog nasilja u 2011. i 2017. godini. Rezultati za 2011. godinu prikupljeni su u okviru projekta »BECAN (Epidemiološka studija zlostavljanja i zanemarivanja djece)«, dok su rezultati za 2017. godinu prikupljeni u okviru 2. vala istraživanja projekta »FEHAP« (»Ekonomske teškoće obitelji, psihosocijalni problemi i obrazovni ishodi adolescenata u vrijeme ekonomske krize«). U oba istraživanja korišteni su probabilistički uzorci učenika drugog razreda srednjih škola, od čega je u istraživanju 2011. godine sudjelovalo 1 233 učenika, a 2017. godine 1 057 učenika. Dobiveni rezultati pokazali su da je u 2017. godini jednogodišnja prevalencija psihičke agresije bila 71,8%, psihičkog zlostavljanja 24,3%, tjelesnog kažnjavanja 23,8% te tjelesnog zlostavljanja 13,1%. U odnosu na istraživanje iz 2011. godine došlo je do povećanja stope psihičkog nasilja, dok je stopa tjelesnog nasilja ostala nepromijenjena. U kontekstu spolnih razlika, djevojke su u 2017. godini bile pod povećanim rizikom za psihičku agresiju, jednako kao i 2011. godine, dok je za psihičko zlostavljanje došlo do ujednačavanja rizika. Za tjelesno nasilje rizik je ostao ujednačen za djevojke i mladiće. U navedenom razdoblju došlo je do povećanja ukupne stope jednogodišnje prevalencije roditeljskog nasilja, što se većinom pripisuje porastu izloženosti psihičkoj agresiji. Dobiveni rezultati ukazuju na visoku raširenost roditeljskog nasilja nad djecom i potrebu za sustavnim provođenjem prevalencijskih istraživanja.In this paper, the main aim is to present the changes in the self reported one-year prevalence of parental violence experienced by adolescents in 2011 and 2017 in Croatia. The data for 2011 were obtained from the »BECAN (Balkan Epidemiological Study on Child Abuse and Neglect)« FP7 project and the data for 2017 were obtained from the second wave of the project »FEHAP« (»Family Economic Hardship, Psychosocial Problems and Educational Outcomes of Adolescents in the Time of Economic Crisis«), funded by the Croatian Science Foundation. At both time-points, the multi-stage probabilistic stratified cluster sample of pupils in the 2nd grade of high school was used. In 2011 the sample consisted of 1233 children, and in 2017 there were 1057 pupils. The results show that in 2017 the one-year prevalence for psychological aggression was 71.8%, for psychological abuse 24.3%, for corporal punishment 23.8%, and for physical abuse 13.1%. Compared to 2011, there was an increase in the prevalence of physical violence, while the prevalence of psychological violence remained unchanged. In the context of gender differences, in 2017 girls were at the higher risk for psychological aggression, equally as in 2011, while the risk for psychological abuse became equal for boys and girls. For physical violence the risk remained equal for boys and girls. In the same period there was an increase of a general rate of one-year prevalence of parental violence, which is mostly attributed to the increase of the prevalence of psychological aggression. The results of this study indicate that the parental violence is widespread and there is a need for systematic prevalence studies