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    Development of a remote-controlled mobile platform for the purpose of cutting the pipes of a nuclear power plant in decommissioning

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    Dekomisija nuklearnih elektrana predstavlja veliki problem u Svijetu. Pojavljuju se problemi kod načina zbrinjavanja nuklearnog otpada i rušenja građevinskih konstrukcija. U takvoj opasnoj radnoj atmosferi od velike pomoći pokazali su se daljinski upravljani roboti. Zadatak diplomskog rada bio je u suradnji s tvrtkom INETEC razviti mobilnu robotsku platformu na koju se postavlja robotska ruka te koja bi služila za pomoć pri dekomisijskim radovima rezanja cijevi i skidanja građevinskih dijelova. Prvo su pronađena postojeća rješenja i patenti kako bi se dobila opća smjernica konstrukcijskom rješenja. Potom su osmišljeni i ocijenjeni koncepti te je izabran koncept s najvišim ocjenama. Izabrani koncept razrađen je u CAD programu Inventor. Konačni model sastoji se od četiri podizne gusjenice koje omogućuju kretanje robotskog sustava u svim smjerovima te ima dodan stabilizacijski mehanizam za dodatnu sigurnost od prevrtanja.Decommissioning nuclear power plants presents a significant problem worldwide. Issues arise with the disposal of nuclear waste and the demolition of structural constructions. In such a hazardous work environment, remotely operated robots have proven to be of great assistance. The objective of the thesis was to collaborate with the company INETEC in developing a mobile robotic platform equipped with a robotic arm, which would aid in decommissioning tasks such as cutting pipes and removing building components. Existing solutions and patents were initially researched to provide a general guideline for the design solution. Subsequently, concepts were devised and evaluated, and the concept with the highest ratings was selected. The chosen concept was further developed using the CAD program Inventor. The final model consists of four lifting caterpillar tracks that enable the movement of the robotic system in all directions, and a stabilizing mechanism has been added to enhance safety and prevent overturning

    Synthesis of isobutyl and isopentyl fatty acid esters and investigation of the application properties of mixtures with mineral diesel

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    Zbog sve manje zalihe fosilnih goriva, a istovremeno sve veće potrebe za energijom radi neprestanog tehnološkog razvitka javila se potreba za alternativom iz obnovljivih izvora. Od ranih početaka izuma motora s unutarnjim izgaranjem pa sve do današnjice, kao gorivo za pogon vozila najintenzivnije se koristilo gorivo iz neobnovljivih izvora. Tokom izgaranja takvog goriva dolazi do emisije štetnih plinova što posljedično jednim dijelom uzrokuje pojavu globalnog zatopljenja. Kako bi ljudska populacija osigurala što kvalitetniju budućnost, niz znanstvenika istražuje goriva iz održivih izvora. Kao jedno od boljih rješenja spomenutog problema pokazao se biodizel. Većina komercijalnih biodizela sintetizirana je reakcijom transesterifikacije iz nižih i ravnolančanih alkohola, metanola ili etanola. U novije doba pojavio se interes za sintezom biodizela iz viših i razgranatih alkohola zbog bolje mješljivosti s mineralnim dizelom, višeg cetanskog broja, veće toplinske vrijednosti, kao i spoznaje da prisutnost strukturalnog grananja dovodi do potencijalnog poboljšanja niskotemperaturnih svojstava biogoriva. U ovom radu sintetizirani su izobutilni esteri masnih kiselina iz otpadnog jestivog ulja, uz kalijev hidroksid (KOH) kao katalizator te izopentilni esteri masnih kiselina također iz otpadnog jestivog ulja, ali uz kiseli katalizator tj. sumpornu kiselinu (H2SO4). Mješavinama biodizela, alkohola i dizela izmjerena su primjenska svojstva koristeći normirane metode te je provedena karakterizacija mješavina pomoću diferencijalne pretražne kalorimetrije (DSC) i goniometra. Svojstva koja su ispitana su kinematička viskoznost, gustoća, napetost površine, temperatura kristalizacije i entalpija kristalizacije. Viskoznost, gustoća i napetost površine smjesa povećavaju se s povećanjem udjela biodizela, a smanjuju se dodatkom alkohola. Kod mjerenja niskotemperaturnih svojstava DSC metodom dokazana je hipoteza o sniženju temperature početka i maksimuma kristalizacije upotrebljavajući za sintezu biodizela razgranate alkohole.Due to the decrease in fossil fuel reserves and the simultaneous increase in energy demand caused by continuous technological development, the demand for an alternative from renewable sources has risen. From the beginnings of the invention of the internal combustion engine to the present day, fuel from non-renewable sources has been used most intensively to power vehicles. The combustion of such fuels releases harmful gasses, which consequently and partly contribute to global warming. To ensure the best possible future for the human population, numerous scientists are researching fuels from sustainable sources. Biodiesel has proven to be one of the better solutions to this problem. Most commercial biodiesel is synthesized from lower alcohols, methanol or ethanol. Recently, there has been increased interest in synthesizing biodiesel from higher alcohols due to better miscibility with mineral diesel, higher cetane number, and higher heating value. In this work, fatty acid isobutyl esters were synthesized from waste cooking oil using potassium hydroxide (KOH) as catalyst and fatty acid isopentyl esters were also synthesized from waste cooking oil but with an acid catalyst, i.e., sulfuric acid (H2SO4). The application properties of the biodiesel, alcohol and diesel mixtures were measured using standardized methods, and their characterization was performed using differential scanning calorimetry (DSC) and a goniometer. The properties tested are kinematic viscosity, density, surface tension, crystallization temperature and enthalpy of crystallization. The viscosity, density and surface tension of the mixtures increase with increasing biodiesel content, while they decrease with the addition of alcohol. When the low-temperature properties were measured by the DSC method, the hypothesis of lowering the crystallization onset and peak temperatures by branched alcohols in the synthesis of biodiesel was confirmed

    Numerical modelling of a car braking system's cooling

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    Pri modeliranju termalnih problema u strojarstvu prisutni su mnogi rješavači (eng. solver) koje odabiremo ovisno o raspoloživim resursima te vremenu koje nam je na raspolaganju za isporučivanje rezultata. U ovome radu usporedit ćemo simulacijski model A i model B. Simulacijski model A je model konvekcijsko-difuzijskog prijenosa pasivnog skalara gdje se nakon rješavanja RANS jednadžbi (engl. Reynolds averaged Navier Stokes) slika strujanja „zamrzne“ te se na takvo polje primjeni jednadžba skalarnog prijenosa za temperaturno polje. Za simulacijski model pristupa B ćemo koristiti jedan od rješavača unutar engl. conjugate heat transfer (skraćeno cHT) simulacijskog modela koji rješava energetsku jednadžbu za slabo stlačivo strujanje. Ovi modeli su uspoređeni na primjeru numeričkog proračuna hlađenja kočnica novog vozila tvrtke Bugatti Rimac koje spada u kategoriju hiper automobila te je hlađenje ovih komponenti od velike važnosti. Zbog promjene gustoće uslijed temperature, u modelu B dobiju se precizniji i pouzdaniji rezultati uz veći utrošak vremena i računalnih resursa u odnosu na model A. Kombiniranjem ova dva, po složenosti vrlo različita simulacijska modela, možemo uštediti vrijeme i resurse prilikom razvoja neke komponente te na taj način postaviti dobre temelje za koheziju između klasičnog strojarstva koji se bavi konstruiranjem komponenti i inženjerskog modeliranja računalnim simulacijama.While modelling thermal problems in engineering there are many solvers at our disposal which can be chosen based on the resources available and time at our disposal to deliver the results. In this thesis we will compare the scalarTransport solver to the conjugateHeatTransfer solver which mostly differ in the way the thermal problem is resolved while the physical dimensions which are being output by the solver are the same. These are mostly heat transfer coefficients (HTCs) and mass flows through key components which are the subject of our evaluation. As an example for our study we will take a numerical simulation model of the brake cooling of Bugatti Rimac's latest hypercar for which this is a key component to cool. Given the fact that this is the automotive industry there are limitations imposed budget and time wise, therefore every minute spent on these simulations count

    The influence of the feedstock type and reaction parameters on the synthesis of fatty acid pentyl and hexyl esters

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    Reakcijom transesterifikacije u kojoj trigliceridi iz ulja/masti reagiraju s alkoholom u prisutnosti katalizatora dolazi do nastajanja alkilnih estera masnih kiselina, odnosno biodizela. Budući da se dobiva iz obnovljivih izvora, biodizel se dodaje u određenim omjerima u dizelsko gorivo, čime se smanjuje utjecaj na okoliš. Metanol se u odnosu na ostale alkohole najviše upotrebljava u proizvodnji biodizela, međutim biodizel se također može proizvoditi iz viših alkohola čija je prednost što se mogu dobiti iz obnovljivih izvora za razliku od metanola. U ovom radu provedena je sinteza biodizela bazično kataliziranom transesterifikacijom, u prisutnosti kalijeva hidroksida, s različitim biosirovinama (suncokretovo, repičino, kokosovo, otpadno jestivo ulje i životinjska mast) te upotrebom alkohola 1-pentanola ili 1-heksanola. Istražen je utjecaj različitih reakcijskih uvjeta na iskorištenje reakcije transesterifikacije. Uvjeti koji su se mijenjali bili su: molarni omjer alkohola i ulja/masti (5:1 i 12:1), vrijeme reakcije (2, 5, 15 i 30 minuta) te maseni udio katalizatora (1 i 3 %). Dobiveni rezultati ukazuju da molarni omjer alkohola i ulja/masti ima najveći utjecaj na iskorištenje reakcije transesterifikacije. Veliki utjecaj na iskorištenje ima i udio katalizatora, dok vrsta biosirovine i vrijeme provedbe reakcije ne utječu značajno na iskorištenje. Iskorištenja dobivena sintezom biodizela iz 1-pentanola i 1-heksanola pri istim uvjetima reakcije imaju slične vrijednosti, ali uočeno je da se povećanjem duljine alkilnog dijela lanca smanjuje iskorištenje korištenjem suncokretovog i repičinog ulja pri omjeru 5:1 s 3 mas.% KOH. Isto tako, vidljivo je da veći udio zasićenih masnih kiselina u sirovini pridonosi višem iskorištenju reakcije. Zadovoljavajuća iskorištenja dobivena su pri molarnom omjeru alkohola i ulja/masti 12:1 i 1 mas.% KOH sintezom iz suncokretovog, repičinog i otpadnog jestivog ulja te životinjske masti, dok su kod kokosovog ulja zadovoljavajuća iskorištenja postignuta korištenjem 5:1 molarnog omjera i 3 mas.% KOH.The transesterification reaction in which triglycerides from oils/fats react with alcohol in the presence of a catalyst leads to the formation of alkyl esters of fatty acids, i.e. biodiesel. Since it is obtained from renewable sources, biodiesel is added in certain proportions to diesel fuel, which reduces the impact on the environment. Compared to other alcohols, methanol is mostly used in the production of biodiesel, but it can also be produced from higher alcohols, the advantage of which is that they can be obtained from renewable sources, unlike methanol. In this work, the synthesis of biodiesel was carried out by base-catalyzed transesterification, in the presence of potassium hydroxide, with different feedstocks (sunflower, rapeseed, coconut, waste cooking oil and animal fat) and using the alcohol 1-pentanol or 1-hexanol. In addition, the influence of different reaction conditions on the yield of the transesterification reaction was investigated. The conditions that were varied were: the molar ratio of alcohol and oil/fat (5:1 and 12:1), the reaction time (2, 5, 15 i 30 minute) and the mass fraction of the catalyst (1 and 3 %). The obtained results indicate that the molar ratio of alcohol and oil/fat has the greatest influence on the utilization of the transesterification reaction. The mass fraction of the catalyst also has a great influence on the conversion, while the type of feedstock and the reaction time do not significantly affect the conversion. The yields obtained by the synthesis of biodiesel from 1-pentanol and 1-hexanol under the same reaction conditions have similar values, but it was observed that increasing the length of the alkyl chain decreases the yield using sunflower and rapeseed oil at a ratio of 5:1 with 3 wt% KOH. Also, it is evident that a higher amount of saturated fatty acids in the feedstock contributes to a higher conversion of the reaction. Satisfactory conversions were obtained at a molar ratio of alcohol and oil/fat of 12:1 and 1 wt% KOH synthesis from sunflower, rapeseed and waste cooking oil and animal fat, while with coconut oil sufficient conversions were achieved using a 5:1 molar ratio and 3 wt% KOH

    Coating technologies and biomedical application of calcium phosphate bioceramics

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    Kalcij-fosfati (CaP) su najčešće korištena skupina biokeramičkih spojeva zbog dobre biokompatibilnosti, oseointegracije i osteokonduktivnosti. Njihova primjena je široka, ali najpoznatiji su po primjeni u dentalnoj i ortopedskoj medicini gdje se zbog kemijske sličnosti s kostima sisavaca koriste kao prevlake na implantatima. Implantati predstavljaju zamjenu/nadomjestak oštećenog dijela kosti ili tkiva i dizajnirani su s ciljem vraćanja funkcije oštećenom dijelu tijela. Najčešće korišteni implantni materijali su metali i njihove legure poput titanija, nehrđajućih čelika i kobalt-krom legura. U tkivnom inženjerstvu za regeneraciju i oseointegraciju kostiju površina implantata modificira se kalcij-fosfatnim prevlakama (CaP prevlake) koje poboljšavaju i ubrzavaju procese rasta i srastanja kostiju. CaP prevlake povećavaju bioaktivnost, biokompatibilnost, otpornost na koroziju i ostala biomehanička svojstva implantnih sustava. Postoje brojne metode pripreme CaP prevlaka od kojih su one najzastupljenije opisane u ovom radu. Jedna od najšire korištenih metoda je elektrokemijsko taloženje, niskotemperaturna metoda visoke dostupnosti i niske cijene opreme. Obzirom na visoki udio starog stanovništva, i sve češće bolesti kostiju i degenerativna i upalna stanja, uključujući nekrozu i osteoporozu, uporaba tkivnog inženjerstva, odnosno potreba za regeneracijom kostiju i tkiva, sve je veća tako da su razvoj i poboljšanje implantnih sustava sa CaP prevlakama predmet konstantnih istraživanja.Calcium phosphates (CaP) are the most commonly used group of bioceramic compounds due to their good biocompatibility, osseointegration and osteoconductivity. Their application is wide, but they are best known for use in dental and orthopedic medicine where, due to their chemical similarity to mammalian bones, they are used as coatings on implants. Implants represent a replacement/substitution of a damaged part of bone or tissue and are designed with the aim of restoring function to the damaged part of the body. The most commonly used implant materials are metals and their alloys such as titanium, stainless steel and cobaltchromium alloys. In tissue engineering for bone regeneration and osseointegration, the implant surface is modified by calcium-phosphate coatings (CaP coatings), which improve and accelerate the processes of bone growth and fixation. CaP coatings increase bioactivity, biocompatibility, corrosion resistance and other biomechanical properties of implant systems. There are numerous methods of preparing CaP coatings, the most common of which are described in this work. One of the most widely used method is electrochemical deposition, a low-temperature method with high availability and low cost of equipment. Due to high proportion of the elderly population, and increasingly frequent bone diseases and degenerative and inflammatory conditions (including necrosis and osteoporosis), the use of tissue engineering, i.e., the need for bone and tissue regeneration, is increasing so that the development and improvement of implant systems with CaP coatings are the subject of constant research

    Emerging contaminants in water

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    Nove onečišćujuće tvari u vodama su kemijski spojevi čija je prisutnost u vodama tek otkrivena ili je tek otkriven njihov štetan utjecaj na ljudsko zdravlje i okoliš. Sadržane su u proizvodima koji se svakodnevno koriste, a radi manjka istraživanja i znanja o njima, ne postoji mnogo zakonskih regulativa. To sve doprinosi njihovoj širokoj prisutnosti. Glavni izvor novih onečišćujućih tvari u vodama su postrojenja za pročišćavanje otpadnih voda s konvencionalnim obradama koja su nedovoljno prilagođena za uklanjanje novih onečišćujućih tvari što rezultira njihovim ispuštanjem u okoliš. U ovom radu definirane su nove onečišćujuće tvari i njihovi izvori. Kao glavni izvor novih onečišćujućih tvari u vodi, istaknute su otpadne vode i navedene su neke od naprednih fizikalno-kemijskih i bioloških obrada. U preglednom dijelu pobliže su objašnjeni endokrini disruptori i antibiotici, te njihovi štetni utjecaji na zdravlje ljudi i okoliš.Emerging contaminants in water are chemical compounds whose presence in water has just been discovered or whose adverse effect on human health and environment has just been discovered. They are contained in products that are used on a daily basis, and due to lack of research and knowledge about them, there are not many legal regulations. That contributes to their ubiquitous presence. The main source of emerging contaminants in water are wastewater treatment plants with conventional treatments that are inadequate to remove emerging contaminants, resulting in their release into the environment. In this paper, emerging contaminants and their sources are defined. Wastewater is highlighted as the main source of emerging pollutants in water and some of the advanced physico-chemical and biological treatments are listed. In the review section, endocrine disruptors and antibiotics are explained in more detail, as well as their harmful effects on human health and the environment

    Numerical modelling of heat transfer and dissipation in power electronics applications

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    Ovaj se diplomski rad bavi analizom prijenosa i disipacije topline unutar sklopa elektroničkih energetskih modula koji su montirani na hladnjak, koristeći numeričke simulacije u softverskom paketu AVL FIRE M. Diplomski rad je napravljen u suradnji s tvrtkom AVL. U radu je validiran numerički model putem već napravljenih eksperimentalnih mjerenja temperature čipova. Mjerenja su napravljena u Grazu, u laboratoriju tvrtke AVL. Nakon toga napravljen je niz parametarskih analiza s ciljem analize utjecaja radnih parametara na hlađenje čipova te, posljedično, temperature sklopa. Rezultati usporedbe eksperimentalnih mjerenja i numeričkih simulacija pokazuju najveću grešku odstupanja maksimalnih temperatura u iznosu od 5.2 °C. Parametarskim analizama je pokazano da je za povećanje prijenosa topline i smanjenje pada tlaka najučinkovitije promjeniti volumni udio etilen glikola u smjesi etilen glikol-voda, koja služi kao rashladni medij u hladnjaku. Rezultati dobiveni ovim parametarskim analizama služit će za dizajniranje učinkovitijih sustava hlađenja sklopova energetske elektronike.This Master’s Thesis focuses on analyzing heat transfer and dissipation in electronic power module assemblies mounted on coolers. The analysis is conducted using numerical simulations with the AVL FIRE M software package. This Thesis was conducted in collaboration with AVL, a leading company in the field. The Thesis problem starts with validating the numerical model by comparing it with experimental chip temperature measurements. The measurements were conducted at AVL’s laboratory in Graz. Subsequently, a series of parametric analyses were performed to investigate the impact of operating parameters on chip cooling and temperatures of the assembly’s components. The comparison between experimental measurements and numerical simulations revealed a maximum deviation error of 5.2 °C. The parametric analyses highlighted that the most effective approach to enhance heat transfer and reduce pressure drop is by adjusting the volume fraction of ethylene glycol in the ethylene glycol-water mixture used as the cooling medium, passing through the heatsink. These findings will contribute to the development of more efficient cooling systems for power electronics assemblies

    Application of Lean principles and tools in product development

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    Kroz ovaj rad bit će opisan životni ciklus proizvoda s posebnim naglaskom na prvu fazu - razvoj proizvoda. Detaljno će se prikazati primjena Vitkog upravljanja na proces razvoja proizvoda putem opisa principa, sistematizacije primjenjivih alata i identifikacije vrsta gubitaka koji se javljaju tijekom procesa. U praktičnom dijelu rada prikazat će se plan razvojnog procesa zajedno s opisom ključnih prekretnica i sustavom kontrole u realnom vremenu, s ciljem sprječavanja nastanka naknadnih gubitaka i iteracija u kasnijim fazama razvoja uzrokovanih greškama.This paper will describe the product life cycle with a specific focus on the first phase - product development. The application of Lean Management to the product development process will be extensively presented through the description of principles, systematization of applicable tools, and identification of types of losses that occur during the process. The practical part of the paper will present a development process plan, along with a description of key milestones and a real-time control system, aiming to prevent the occurrence of subsequent losses and iterations in later stages of development caused by discrepancie

    Surface modification of dental materials

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    Glavni izazov za inženjere današnjice, koji se bave dentalnim materijalima, je proizvesti dentalne implantate koji uspješno imitiraju karakteristike prirodnih kostiju kako bi zdravlje kostiju bilo očuvano te kako bi oralna rehabilitacija bila osigurana. Dentalni implantati su uglavnom izrađeni od titanija i njegovih legura. Parametri, poput geometrije i topografije površine, su ključni za uspješan rani klinički ishod. Budući da hrapava površina pogoduje lakšem „usidrenju“ kosti, kao i biomehaničkoj stabilnosti, vrlo je važno da dentalni implantati imaju grubu površinu. Osim površinskih svojstava, kemijski sastav također pridonosi biološkim procesima tijekom oseointegracije. Glavni cilj ovoga istraživanja je modificirati površinu titanija zaštitnom i osteokonduktivnom prevlakom pomoću metode elektroispredanja. Prevlaka je sačinjena od vlakana polivinilpirolidona kao nosača kalcijevih iona. Poznato je da je kalcij nužan za zdravlje kostiju i za dobar metabolizam, stoga je važno da je aktivno uključen u proces oseointegracije jer na taj način ubrzava i pospješuje stvaranje nove kosti koja okružuje implantat. Morfologija površine modificiranog titanija ispitana je pretražnom elektronskom mikroskopijom (SEM), a kemijska analiza je provedena energijski razlučujućom rendgenskom spektrometrijom (EDS) i infracrvenom spektroskopijom s Fourierovom transformacijom uz prigušenu totalnu refleksiju (ATR-FTIR). Korozijska svojstva nemodificiranog i modificiranog titanija ispitana su u otopini umjetne sline u stvarnim uvjetima primjene pomoću elektrokemijske impedancijske spektroskopije (EIS). Rezultati ukazuju na poboljšanu zaštitu od korozije titanija s prevlakom u usporedbi s nemodificiranim titanijem.Nowadays, the major challenge for engineers is to produce dental implant surfaces that closely mimic the characteristics of natural bone to allow patients to achieve healthy bone conditions and oral rehabilitation. Most dental implants are made of titanium and its alloys. Parameters, such as geometry and surface topography, are crucial for a successful early clinical outcome. Since a rough topography favours both bone anchorage and biomechanical stability, it is of great importance that dental implants have a rough surface. In addition to the surface properties, the chemical composition also contributes to the biological processes during osseointegration. The main aim of this study was to modify the titanium surface with a protective and at the same time osteoconductive coating by the electrospinning method. The coating consists of polyvinylpyrrolidone (PVP) fibers as a carrier of calcium ions. It is known that calcium is very important for bone health and metabolism. Therefore, it should be actively involved in the osseointegration process and accelerate and promote the formation of new bone surrounding the implant. The surface morphology of the modified titanium was carried out by scanning electron microscopy (SEM) and the chemical elemental analysis of the coating by energy dispersive X-ray spectroscopy (EDS). The corrosion properties of unmodified and modified titanium were investigated in an artificial saliva solution under real application conditions by electrochemical impedance spectroscopy (EIS). The results indicate improved corrosion protection behaviour of the coated titanium compared to unmodified titanium

    Improving productivity through automation of the manufacturing process

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    Industrija 4.0 predstavlja nove mogućnosti, ali i nove izazove za kompanije orijentirane na proizvodnju. Tehnološki napredak donio je sa sobom velik broj noviteta koji mogu biti implementirani u proizvodne sustave s namjerom da ih se modernizira, ubrza te optimizira kako bi mogli polučiti bolje rezultate i tako zadovoljiti sve zahtjevnije tržište. Stoga, kako bi povećale svoju produktivnost mnoge kompanije žele držati korak s trendovima u industriji i tako pokušati ostvariti konkurentsku prednost. Ključ u tome je uvođenje automatizacije u proizvodnju, usporedno s digitalizacijom. Ovaj rad prezentira najvažnije suvremene tehnologije Industrije 4.0 te pobliže prikazuje pristup i strategije uvođenja automatizacije na primjeru iz prakse.Industry 4.0 represents new opportunities, but also new challenges for production-oriented companies. Technological progress has brought with it many novelties that can be implemented in production systems with the intention of modernizing, speeding up and optimizing them so that they could obtain better results and thus satisfy the increasingly demanding market. Therefore, in order to increase their productivity, many companies want to keep up with the trends in the industry and consequently try to achieve a competitive advantage. The key to this is the introduction of automation in production, along with digitalization. This paper presents the most important modern technologies of Industry 4.0 and shows in more detail the approach and strategies of implementing automation on a real example

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