Evanescently-coupled hybrid III-V/silicon laser based on DVS-BCB bonding

© 2014 IEEE. Controllable electrical breakdown of multiwall nanotubes (MWNTs) is studied utilizing the atomic force microscopy (AFM). Electrical breakdown has been known as the way to fundamentally understand the electrical properties of nanotubes and an approach to develop MWNT based transistors and sensors. Normally, electrical breakdown was known to be happened in the center of MWNT because of the thermal accumulation. However, considering the effect of thermal dissipation, the electrical breakdown could be mechanically controlled by an additional heat sink, which could be the substrate of MWNT device. Therefore, the electrical breakdown process is controllable through controlling Joule heating and thermal dissipation. In this research, we study the crucial factors that affect the electrical breakdown. The AFM based nano robot is used to measure the conductance distribution, and manipulate the three dimensional structure of MWNT in order to change the position of heat sink to control the location where electrical breakdown happened. The controllable electrical breakdown is an alternative approach for conducting bandgap engineering in nanodevice and fabricating high performance nano sensors and transistors.Link_to_subscribed_fulltex

Urbano zapošljavanje u post-tranzicijskim gospodarstvima: neusklađenost vještina na lokalnom tržištu rada

The paper explores the mismatch between the skills and qualifications required by the labour market and those acquired through education and on-the-job learning. The skill mismatch in transition economies tends to be even more pronounced as the labour markets in these countries are characterized by structural unemployment, affecting both older workers with obsolete skills and the young ones. Employers face poor incentives for investing in workforce skill development, due to the inadequate investment climate and volatile business environment. Transition countries face increasing outward mobility of an educated workforce, loss of human capital, and shortage of workforce in the fields such as ICT, medicine, science and research. The research is based on empirical data generated in a survey on ICT and manufacturing enterprises in the City of Niš, Serbia. The research methodology combines workers\u27 self-assessment method for the skill gap measurement and the competence approach combined with the statistical methods. The findings indicate the presence of a qualification mismatch, in the form of the over-qualification as a dominant irregularity in the analysed labour market. The results of the study are expected to contribute to creating a network of policy instrumentaria that tend to be effective on a sub-national level in addressing the mismatch.Ovaj rad istražuje neusklađenost između vještina i kvalifikacija koje zahtijeva tržište rada i onih koje se stječu obrazovanjem i učenjem na radnom mjestu. Neusklađenost vještina u tranzicijskim gospodarstvima ima tendenciju da bude još izraženija budući da tržišta rada u tim zemljama karakterizira strukturna nezaposlenost, koja istovremeno pogađa i starije radnike sa zastarjelim vještinama i mlade. Poslodavci se suočavaju s lošim poticajima za ulaganje u razvoj vještina radne snage zbog neodgovarajuće investicijske klime i nestabilnog poslovnog okruženja. Zemlje u tranziciji suočavaju se sa sve većom vanjskom mobilnošću obrazovane radne snage, gubitkom ljudskog kapitala i nedostatkom radne snage u područjima kao što su ICT, medicina, znanost i istraživanje. Istraživanje se temelji na empirijskim podacima prikupljenim u anketi o ICT-u i proizvodnim poduzećima u gradu Nišu u Srbiji. Metodologija istraživanja kombinira metodu samoprocjene radnika za mjerenje jaza u vještinama i pristup temeljen na kompetencijama u kombinaciji sa statističkim metodama. Nalazi ukazuju na prisutnost kvalifikacijske neusklađenosti, u vidu prekvalificiranosti za posao kao dominantne nepravilnosti na analiziranom tržištu rada. Očekuje se da će rezultati studije doprinijeti stvaranju mreže političkih instrumenata koji imaju tendenciju da budu učinkoviti na podnacionalnoj razini u rješavanju neusklađenosti

PREDICTOR VALIDITY OF MORPHOLOGICAL AND BASIC MOTOR VARIABLES FOR ASSESSMENT AND MONITORING OF THE KARATE PUNCH WITH THE LEAD ARM (OI-TSUKI)

The purpose of this study was to determine the influence of morphological and basic motor variables on the karate forward punch (oi tsuki) as the only criterion variable, and secondly, to design a test battery for the assessment and monitoring of boys in karate, based on the predictive validity of the tested variables. A system of 25 variables in total – 12 morphological, 12 basic motor (the system of predictor variables) and 1 variable of situational moving structure (criterion variable), i.e. the karate punch with the lead arm (oi-tsuki) – was applied on a sample of 82 karate trainees aged between 10 and 14. The results of regression analysis showed that a system of morphological and basic motor variables had a significant impact on punching with the lead arm (p<0.01). The stepwise method identified the largest individual value in the case of morphological variables of arm length, upper arm skinfold and body mass at the level of significance p<0.01, whereas basic motor variables (long jump from a standing start and half squat with weight) also have a level of significance p<0.01. This shows that respondents with longer arms, less subcutaneous fat tissue on the upper arm, higher body mass and greater static and explosive strength of the lower extremities achieve better results. Determining predictor validity by regression analysis and the stepwise method is employed in order to diagnose, assess, monitor and evaluate the direct punch with the lead arm, so the next battery of measurement instruments can be constructed: arm length, upper arm skinfold, body mass, half squat with weight, long jump from a standing position

Cretaceous/Tertiary Boundary from the Koraljka-1 Off-Shore Well (SW of Zadar, Adriatic Sea)

Deep exploration well Koraljka-1 in the central part of the Adriatic Sea was drilled through Neogene and Paleogene deposits and penetrated the Upper Cretaceous. In the interval from 2500 to 2230 m, the Cretaceous and Paleogene deposits consist of white to grey, mud-supported, fairly fossiliferous deeper-water, chalky limestone (wackestone-mudstone) with sporadic occurrences of chert, intercalated with bioclastic limestone packstone/rudstone to floatstone. Bioclastic limestone (calcarenite) intercalations, which yield platform-derived detritus, were redeposited seaward on the deep platform slope by a gravity mechanism. Lithostratigraphically, sedimentation was almost continuous across the Cretaceous - Tertiary boundary. The importance of these deposits and their stratigraphic interest is based on the fact that there is no on-shore equivalent of such deeper-water deposits in the Croatian part of the Outer Dinarids. In biostratigraphic terms, the K/T boundary is marked by significant changes in the microfossil assemblages (calcareous nannofossils, plankton and benthic foraminifera), which revealed that the hiatus at the boundary is minimal

Transport and storage of heavy metals in the Sava river basin in Serbia

Selected heavy metals (Cu, Zn, Pb and Cd) in Sava River water and sediment in Serbia were investigated on three locations in the vicinity of industrial and urban settlements (Šabac, Obrenovac, Beograd) during the period spring 2007-autumn 2011. The fluxes of heavy metals from river water to sediment due to sedimentation and heavy metal re-suspension fluxes due to sediment re-suspension at a high flow were determined, by applying the model for assessment of the transport the pollutants through rivers. Those fluxes were attributed mainly to natural processes. [Projekat Ministarstva nauke Republike Srbije, br. 43009

Investigation of the mortar and concrete resistance in aggressive solutions

U radu je prikazan utjecaj dva agresivna rastvora – sulfata i nitrata na žbuku i beton. U eksperimentalnom radu ispitivane su prizme od žbuke s 5 % specijalnog dodatka. Četiri vrste betona su također izložene agresivnim rastvorima. Kemijska otpornost ispitivana je prema metodi Koch-Steinegger. Kako je uvjet za otpornost kod agresivnih rastvora da zatezna čvrstoća žbuke nije niža od 70 % u odnosu na referentne prizme njegovane u vodi, može se zaključiti da žbuka i beton izrađeni s kombinacijom cementa i dodataka, prikazani u ovom istraživanju, nisu otporni na rastvor amonijak nitrata ali jesu na sulfatnu koroziju.Testing the influence of two aggressive solutions - sulphate and nitrate on mortar and concrete was presented in this paper. Experimental work included testing of mortar prisms with 5 % special admixture. Also, four types of concrete were exposed to aggressive solutions. The chemical resistance was tested according to the Koch-Steinegger method. As a condition for resistance in aggressive solution means that flexural strength of mortar prisms is no less than 70 % of referent prisms cured in water it can be concluded that mortar and concrete made with combination of cement and admixture presented in this investigation are not resistant to ammonium nitrate solution, but are resistant to sulphate corrosion