University of Split Repository
Not a member yet
29028 research outputs found
Sort by
Misconceptions and different teaching approaches in introductory programming at the K-12 level
No full textProgramiranje je poseban način razmišljanja kojim se od postavljenog problema dolazi do rješenja izvedivog na računalu. Upravo je zbog toga učenje programiranja danas tako važno. Istovremeno, ono je i zahtjevno, pa je prirodno tražiti načine kako ga olakšati primjenom različitih obrazovnih alata. Poučavanje programiranja bit će uspješnije ukoliko učitelji steknu uvid u ono što učenici znaju, ali također i u ono što ne znaju, pa je poznavanje najčešćih pogrešnih shvaćanja učenika nužno. Dodatnu prepreku uspješnom poučavanju mogu predstavljati i apstrakcije, koje su temeljni koncept programiranja. To se posebno odnosi na učenike petih i šestih razreda osnovne škole jer se oni nalaze u konkretnoj fazi kognitivnog razvoja i imaju poteškoće već u ranim fazama učenja apstraktnih programerskih koncepata, koji nisu prikladni njihovu uzrastu. Problemi su još izraženiji ukoliko se u poučavanju koriste tradicionalni oblici nastave te isključivo tekstualni programski jezici, kod kojih je naglasak na sintaksi umjesto na semantici. U cilju prevladavanja navedenih poteškoća, a budući da postoji nedostatak sličnih istraživanja kod učenika koji još uvijek nisu dosegli formalnu fazu kognitivnog razvoja, osmišljeno je istraživanje u četiri faze. Rezultati istraživanja ukazali su na najčešće miskoncepcije učenika te dobi o kojima treba voditi računa prilikom planiranja uvodnog poučavanja programiranja. Rezultati su također potvrdili da na uspjeh učenika ne utječe vrsta odabranog tekstualnog programskog jezika za poučavanje. Osim toga, dobiveni rezultati pokazali su da vizualizacija nema utjecaj ne rezultate učenja, dok vizualno programiranje ima pozitivan učinak na usvajanje svih ispitivanih osnovnih programerskih koncepata kod programera početnika osnovnoškolske (K-12) razine, čime opravdava svoju primjenu u poučavanju.Programming is a unique way of thinking that leads from a given problem to a solution achievable on a computer. This is precisely why learning programming holds such importance today. Simultaneously, it is also challenging, prompting a natural search for ways to facilitate it through the use of various educational tools. Teaching programming will be more successful if educators gain insight into what students know, but also into what they don't, thus understanding the most common misconceptions students hold is essential. Additional hurdles to effective teaching can arise from abstractions, which constitute fundamental programming concepts. This concern is particularly relevant to fifth and sixth-grade elementary school students, as they find themselves in a concrete phase of cognitive development and face difficulties in the early stages of learning abstract programming concepts that are not suitable for their developmental age. These challenges are exacerbated when traditional teaching methods are employed, coupled with exclusively textual programming languages that emphasize syntax over semantics. In order to overcome the aforementioned difficulties, and due to the lack of similar research involving students who have not yet reached the formal stage of cognitive development, a four-phase study was devised. Research results highlighted the most common misconceptions held by students of this age group, which need to be taken into account when planning introductory programming education. The findings also confirmed that the choice of textual programming language for teaching does not influence student success. Furthermore, the obtained results demonstrated that visualization does not impact learning outcomes, while visual programming, in contrast, has a positive effect on the acquisition of all examined fundamental programming concepts among beginner K-12 level programmers. This effect justifies its application in teaching
Calculation of the Structure by the Methods of Lateral Forces, Pushover, Time History : Master's Thesis
No full textU diplomskom radu analizirana je konstrukcija zgrade s jezgrom od a-b zidova i omeđenih zidova na pročelju. Proveden je proračun nosive konstrukcije na potres prema tri metode: metoda bočnih sila, metoda naguravanja, metoda odgovora u vremenu. Uspoređeni su odgovori primijenjenih metoda.The thesis analyzed the construction of the building with a core of reinforced concrete walls and brick walls on the front. The calculation of the load-bearing structure against an earthquake was carried out according to three methods: the method of lateral forces, the pushover method, and the time history method. The answers of the applied methods were compare
Wastewater treatment using a hybrid process of electrocoagulation, zeolite, and ultrasound : diploma thesis
No full textU ovom radu provedena su ispitivanja hibridnog procesa obrade kompostne otpadne vode kombinacijom elektrokoagulacije, sintetskog zeolita granulacije < 40 µm i dvije razine intenziteta ultrazvuka snage od 240 W, minimalnoj i maksimalnoj, a koje odgovaraju razinama 1 i 5. Eksperimenti su izvedeni u elektrokemijskoj ćeliji s aluminijevim, željeznim i cinkovim elektrodama, pri konstantnoj gustoći struje od 0,0182 A/cm 2 , udaljenosti elektroda od 3 cm, brzinom vrtnje miješala 250 okr/min, dodatkom elektrolita 0,5 g/L i zeolita 15 g/L. Tijekom eksperimenta pratili su se parametri poput pH vrijednosti, temperature i električne vodljivosti, dok su mutnoća, ukupni isparni ostatak i kemijska potrošnja kisika određivani na početku i kraju procesa. Nakon provedbe hibridnog procesa ispitane su promjene mase elektroda te test taloživosti suspenzija. Rezultati su pokazali da je za obradu kompostne otpadne vode najbolje upotrijebiti elektrokoagulaciju sa zeolitom i željeznim elektrodama uz primjenu intenziteta snage ultrazvuka razine 5. Izračun operativnih troškova pokazao je da istovremena primjena i zeolita i ultrazvuka u svrhu boljeg otapanja elektroda ne pokazuje sinergijski efekt, osim kod hibridnog procesa EKZ sa Fe elektrodama i intenzitetom snage ultrazvuka razine 5. To ukazuje da odabir materijala elektroda je vrlo bitan čimbenik koji određuje hoće li istovremena primjena zeolita i ultrazvuka imati pozitivan efekt.In this study, a hybrid process for the treatment of compost wastewater was investigated using a combination of electrocoagulation, synthetic zeolite granulation <40 μm and two levels of ultrasonic power intensity of 240 W, minimum and maximum, corresponding to levels 1 and 5. The experiments were carried out in an electrochemical cell with aluminium, iron and zinc electrodes, at a constant current density of 0.0182 A/cm², an electrode distance of 3 cm, a stirring speed of 250 rpm, with the addition of 0.5 g/L electrolyte and 15 g/L zeolite. During the experiment, parameters such as pH value, temperature and electrical conductivity were monitored, while turbidity, total solids and chemical oxygen demand were determined at the beginning and end of the process. After a hybrid process the electrode mass changes and the settling test of the suspension were examined. The results showed that electrocoagulation with zeolite and iron electrodes using a level 5 ultrasonic power intensity is the most suitable for the treatment of composting wastewater. The calculation of operating costs showed that the simultaneous use of zeolite and ultrasound to improve electrode dissolution has no synergistic effect, except in the case of the hybrid ECZ process with Fe electrodes and a level 5 ultrasonic power intensity. This indicates that the choice of electrode material is a decisive factor in determining whether the simultaneous use of zeolite and ultrasound has a positive effect
Seismic Analysis of Reinforced Masonry Historic Towers by Finite-Discrete Element Method : Master's Thesis
No full textU ovom radu provedena je analiza utjecaja ojačanja na ponašanje povijesnih zidanih tornjeva izloženih seizmičkom opterećenju. Za numeričku analizu korišten je Y2D numerički program koji se temelji na kombiniraj metodi konačno-diskretnih elemenata. Potres na koji su tornjevi analizirani je zapis potresa u Petrovcu, Crna Gora, 1979. godine. Analiza je izvršena za dvije faze tornjeva: tornjevi s neojačanim i tornjevi s ojačanim karakteristikama materijala. Rezultat analize je prikazati rezultate graničnih stanja tornjeva.In this paper, an analysis of the influence of reinforcement on the behavior of historic masonry towers exposed to seismic load was carried out. For the numerical analysis, the Y2D numerical program based on the combined finite-discrete element method was used. The earthquake for which the towers were analyzed is a record of an earthquake in Petrovac, Montenegro in 1979. The analysis was performed for two phases of towers: towers with unreinforced and towers with reinforced material properties. The result of the analysis is to show the results of the limit states of the towers
The effect of propolis extract on the corrosion behavior of Ti and Ti-6Al-4V alloy in simulated oral cavity conditions : diploma thesis
No full textTitanij i njegove legure su, zbog biokompatibilnosti i visoke otpornosti na koroziju, standardni materijali za izradu dentalnih implantata. Korozijska otpornost ovih materijala povezana je s prisutnošću zaštitnog oksidnog sloja na površini. Međutim, tijekom upale nastaju različiti reaktivni spojevi kisika koji mogu oštetiti pasivni oksidni sloj što rezultira degradacijom titanijevih implantata. Jedna od često primjenjivanih metoda zaštite metala od korozije je zaštita metala inhibitorima korozije. U ovom radu istraživan utjecaj etanolnog ekstrakta propolisa na korozijsko ponašanje titanijevih biomaterijala (Ti i Ti-6Al-4V) u simuliranim uvjetima usne šupljine bez upale, s blažom ili s težom upalom. Ispitivanja su provedena elektrokemijskim metodama (metoda mjerenja potencijala otvorenog strujnog kruga, metoda linearne polarizacije i potenciodinamička polarizacijska metoda), a površine uzoraka analizirane su optičkim mikroskopom. Dobiveni rezultati pokazuju kako etanolni ekstrakt propolisa inhibira koroziju Ti u simuliranim uvjetima usne šupljine bez upale i s blažom upalom, a u simuliranim uvjetima usne šupljine s težom upalom etanolni ekstrakt propolisa potiče koroziju Ti. Etanolni ekstrakt propolisa inhibira koroziju Ti-6Al-4V legure u simuliranim uvjetima usne šupljine bez upale i s upalom. Inhibitorska djelotvornost etanolnog ekstrakta propolisa je najveća za Ti-6Al-4V leguru u simuliranim uvjetima usne šupljine bez upale, a smanjuje se s povećanjem stupnja upale. Rezultati istraživanja ukazuju na mogućnost primjene ispitivanog etanolnog ekstrakta propolisa kao korozijskog inhibitora za zaštitu od korozije Ti i Ti-6Al-4V legure u ispitivanim uvjetima.Titanium and its alloys are commonly used for dental implants prosthetics owing to their high biocompatibility and corrosion resistance. The corrosion resistance of these materials is related to the presence of the protective oxide film on the surface. However, various reactive oxygen species are present during inflammation, which can alter the passive film, resulting in the degradation of the titanium implants. Using corrosion inhibitors is one of the most common methods to prevent corrosion in metal and alloys. This research examined the effect of ethanolic extract of propolis on the corrosion behavior of titanium biomaterials (Ti and Ti-6Al-4V) in simulated oral cavity conditions without inflammation, with moderate or strong inflammation. This study was carried out by electrochemical techniques (open circuit potential measurement, linear polarisation, and potentiodynamic polarisation measurement), while the specimen’s surface was examined using an optical microscope. The results show that in simulated conditions of the oral cavity without and with moderate inflammation, the ethanolic extract of propolis inhibits Ti corrosion. In contrast, in simulated conditions of the oral cavity with strong inflammation, it promotes Ti corrosion. The ethanolic extract of propolis reduces corrosion of Ti-6Al-4V alloy in simulated oral cavity conditions, both without and with inflammation. The maximal inhibitory efficiency of ethanolic extract of propolis was for the Ti-6Al-4V alloy in simulated conditions of the oral cavity without inflammation, but inhibition efficiency decreased as the degree of inflammation increased. The results show that the tested ethanolic extract of propolis can be used as a corrosion inhibitor for the protection of Ti and Ti-6Al-4V alloy under the tested conditions
Statistical analysis of total water hardness data of the Jadro river : diploma thesis
No full textU diplomskom radu izvršena je statistička analiza podataka o ukupnoj tvrdoći vode koristeći različite statističke metode. Cilj ovog diplomskog rada je primjenom različitih statističkih metoda analizirati podatke o ukupnoj tvrdoći vode na pojedinim lokacijama u gradu Splitu kao i na samom izvorištu rijeke Jadro. Na temelju prikupljenih podataka o ukupnoj tvrdoći vode na različitim lokacijama u području Splita te na izvoru rijeke Jadro, podaci su obrađeni pomoću deskriptivne statistike kako bi se dobio uvid u osnovne karakteristike uzoraka, poput srednje vrijednosti, standardne devijacije, raspona i drugih relevantnih statističkih parametara. Daljnja analiza uključivala je primjenu inferencijalne statistike s ciljem testiranja hipoteza i donošenja zaključaka o populaciji iz koje su uzorci uzeti. Korištene metode uključivale su T - test i F - test radi utvrđivanja značajnosti razlika i povezanosti među različitim skupinama podataka. Ovim istraživanjem istaknuta je važnost statističke obrade podataka u razumijevanju i interpretaciji ne samo mjerenja tvrdoće vode, već i brojnih drugih okolnosti iz svakodnevnog života.In this thesis, a statistical analysis of data on total water hardness was conducted using various statistical methods. The aim of this thesis is to analyze data on total water hardness at specific locations in the city of Split as well as at the Jadro River source using different statistical methods. Based on the collected data on total water hardness at different locations in the Split area and at the Jadro River source, the data were processed using descriptive statistics to gain insight into the basic characteristics of the samples, such as mean, standard deviation, range, and other relevant statistical parameters. Further analysis included the application of inferential statistics to test hypotheses and draw conclusions about the population from which the samples were taken. The methods used included the T - test and F - test to determine the significance of differences and relationships between different data groups. This research highlighted the importance of statistical data processing in understanding and interpreting not only measurements of water hardness but also numerous other circumstances from everyday life
Impact of SBT impeller diameter on kinetics of copper sorption on zeolite : diploma thesis
No full textIspitivan je utjecaj promjera turbinskog miješala s ravnim lopaticama, tzv. SBT miješala na sorpciju iona bakra na sintetskom zeolitu NaX. Kinetički eksperimenti su provedeni u kotlastom reaktoru nestandardnih dimenzija uz miješanje suspenzije pri konstantnoj temperaturi u trajanju od 30 minuta. Analiza dobivenih kinetičkih podataka provedena je primjenom Blanchardovog i Weber-Morrisovog modela. Dobro slaganje eksperimentalnih kinetičkih podataka s Blanchardovim modelom i neslaganje s Weber-Morrisovim modelom ukazuje na to da ispitivana reakcija prati kinetiku reakcije drugog reda i da difuzijski procesi ne utječu na ukupnu brzinu ispitivanog procesa.The influence of the diameter of the turbine impeller with flat blades, the so-called SBT impeller for the sorption of copper ions on synthetic zeolite NaX was examined. The kinetic experiments were carried out in a batch reactor with non-standard dimensions while stirring of the suspension at a constant temperature for 30 minutes. The kinetic data obtained were analysed using the Blanchard and Weber-Morris models. The good agreement of the experimental kinetic data with the Blanchard model and the disagreement with the Weber-Morris model indicate that the investigated reaction follows second-order reaction kinetics and that diffusion processes do not affect the overall rate of the investigated process
Wastewater treatment by hybrid electrocoagulation process with aluminium electrodes, zeolite and magnet : diploma thesis
No full textU ovom radu ispitano je djelovanje magneta na učinkovitost obrade otpadne kompostne vode s hibridinim procesom elektrokoagulacije s aluminijevim elektrodama uz dodatak sintetskog zeolita i primjene magneta. Eksperimenti su provedeni u trajanju od 10 do 30 minuta bez podešavanja početne pH vrijednosti, uz dvije brzine vrtnje miješala od 250 i 350 okr./min te prisutnost i odsutnost magneta. Učinkovitost procesa ispitivana je preko fizikalno-kemijskih pokazatelja, promjene mase elektroda te sposobnosti taloženja suspenzije. Na kraju je provedena analiza operativnih troškova na temelju Faradayeva zakona i stvarne potrošnje elektroda. Rezultati su pokazali da je nešto veći porast temperature otopine u eksperimentima s magnetom u trajanju od 20 i 30 minuta, porast pH vrijednosti za eksperimente u trajanju od 30 minuta, dok vrijednosti električne vodljivosti i prikupljene mase taloga osciliraju ovisno o vremenu kontakta, prisutnosti magneta i brzini vrtnje miješala. Prisutnost magneta je kod eksperimenata u trajanju od 30 minuta pridonijela većem smanjenju kemijske potrošnje kisika (KPK), a u eksperimentima u trajanju od 20 i 30 minuta za uklanjanje mutnoće. Međutim, elektrokoagulacija potpomognuta magnetom pokazuje trend veće potrošnje električne energije, dok je manja potrošnja elektroda uočena samo u eksperimentima pri 20 min vremena kontakta i brzini vrtnje od 250 okr./min.In this paper, the effect of magnets on the efficiency of waste compost water treatment with the hybrid process of electrocoagulation with aluminum electrodes with the addition of synthetic zeolite and magnets usage was examined. The experiments were carried out for 10 to 30 minutes without adjusting the initial pH value, with two mixing speeds of 250 and 350 rpm and the presence or absence of a magnet. The effectiveness of the process was examined through physico-chemical indicators, changes in the mass of the electrodes and the ability to settle the suspension. At the end, an analysis of operating costs was evaluated based on Faraday's law and the actual consumption of electrodes. The results showed that the increase in the temperature of the solution in the experiments with a magnet lasting 20 and 30 minutes was slightly higher, the increase in the pH value for the experiments lasting 30 minutes, while the values of the electrical conductivity and the collected mass of the precipitate fluctuated depending on the contact time, the presence of the magnet and mixing speed. The presence of the magnet contributed to a greater reduction of COD in the 30-minute experiments, and to the removal of turbidity in the 20- and 30-minute experiments. However, magnet-assisted electrocoagulation shows a trend of higher electricity consumption, while lower electrode consumption was observed only in experiments with 20 min of contact time and a rotation speed of 250 rpm
Re: tvornica : diplomski rad
No full textDiplomski rad pod nazivom re:tvornica bavi se prenamjenom bivše preparandije i tvornice duhana koja datira iz 1866. godine na lokaciji Zadarskih Kolovara. Cilj projekta je stvaranje heterotopije kao mjesta za stanare ali i širu zajednicu u kojoj se nalaze svi potrebni sadržaji za svakodnevni život i rekreaciju. Ostavljena je mogućnost za daljnje transformacije i prenamjene prostora u slučaju pojava novih zahtjeva i funkcija koje će služiti zajednici. Predstavlja ključni korak u razvoju grada koji uključuje prošlost, sadašnjost i budućnost