Jubilarna knjiga u jedinstvenoj biblioteci

Prikaz knjige Tomislav Raukar, Studije o Dalmaciji u srednjem vijeku (Odabrane studije), Biblioteka znanstvenih djela, knjiga broj 150, Književni krug, Split 2007

Distantly Supervised Web Relation Extraction for Knowledge Base Population

Extracting information from Web pages for populating large, cross-domain knowledge bases requires methods which are suitable across domains, do not require manual effort to adapt to new domains, are able to deal with noise, and integrate information extracted from different Web pages. Recent approaches have used existing knowledge bases to learn to extract information with promising results, one of those approaches being distant supervision. Distant supervision is an unsupervised method which uses background information from the Linking Open Data cloud to automatically label sentences with relations to create training data for relation classifiers. In this paper we propose the use of distant supervision for relation extraction from the Web. Although the method is promising, existing approaches are still not suitable for Web extraction as they suffer from three main issues: data sparsity, noise and lexical ambiguity. Our approach reduces the impact of data sparsity by making entity recognition tools more robust across domains and extracting relations across sentence boundaries using unsupervised co- reference resolution methods. We reduce the noise caused by lexical ambiguity by employing statistical methods to strategically select training data. To combine information extracted from multiple sources for populating knowledge bases we present and evaluate several information integration strategies and show that those benefit immensely from additional relation mentions extracted using co-reference resolution, increasing precision by 8%. We further show that strategically selecting training data can increase precision by a further 3%

Influence of poly(ethylene oxide) sample preparation on the results of thermogravimetric analysis

Aim: To investigate whether the sample preparation process of poly(ethylene oxide) (PEO) affects kinetic analysis of the thermal degradation process. Kinetic analysis was performed to describe the course of a chemical reaction regardless of the reaction conditions and the reaction system complexity. One differential method, the Friedman method, and one integral Kissinger-Akahira-Sunose method (KAS), were applied in this work. Methods: The PEO sample was prepared in 4 different ways. Thermogravimetric analysis was performed to determine the thermal degradation of prepared samples. Infrared spectroscopic analysis was performed during the preparation of the PEO film obtained by casting from the solution. Results: Dynamic thermal decomposition of PEO, regardless of the method of preparation, takes place through a single decomposition stage, which is manifested by the appearance of one peak on derivative thermogravimetric (DTG) curve. During the preparation of the PEO film, the procedure was carried out at a temperature higher than its melting temperature (Tm=65°C). After the cooling, the obtained sample didn’t solidify and it had an intense odor of acetic acid, which was confirmed by infrared spectroscopic analysis. Samples III and IV were re-prepared at a temperature lower than the melting point of PEO, obtaining samples of satisfactory quality. Conclusion: In order to prepare poly(ethylene oxide) films by solution casting technique, drying should be carried out at temperatures below the melting point of PEO. If TG analysis of pure PEO powder is compared with the results of hot pressed samples and solution cast samples, it can be concluded that the preparation of the sample doesn’t affect the thermal stability of the PEO. The dependence of activation energy calculated by the differential Friedman and integral KAS method on conversion is constant for all samples in a broad conversion range, regardless of how the samples were prepared. The hot pressed samples and solution cast samples have lower activation energy than the commercial PEO powder

Transients in no-load condition of power transformer 20/0,4 kV

Ovaj rad predstavlja inovativan pristup u analizu prijelaznih pojava u elektroenergetskom sustavu korištenjem novopredloženih načina obrade podataka dobivenih iz procesora ugrađenog u moderne zaštitne releje u elektroenergetskom sustavu. Prijelazne pojave se precizno registriraju tijekom uključivanja energetskog transformatora i puštanja u prazni hod. Analizirani su energetski transformatori 20/0,4 kV u TS 110/20 kV Osijek-4 koji služe za opskrbu električnom energijom vlastitih potreba transformatorske stanice. U radu su grafički prikazani vremenski odzivi glavnih električnih parametara kao i Fourierova analiza viših harmonika.Innovative approach in power system transient analysis is presented in the paper, applying a new proposed method to process data obtained from processor built in modern protection power relays. The transients, described here appeared precisely while turning the power transformer on and setting it in the no-load condition. The analyzed power transformers 20/0,4 kV are installed to meet the auxiliary needs of the transformer substation TS 110/20 kV Osijek-4 with electric power. Time response graphic presentations of main power parameters and Fourier analysis of higher harmonics are presented in this paper

DISEASES OF FLOWERS AND DECORATIVE PLANTS

Sveučilišni udžbenik Bolesti cvije}a i ukrasnog bilja upoznaje studente preddiplomskih, diplomskih i poslijediplomskih sveučilišnih studija, ali i sve koji se bave proizvodnjom cvijeća i ukrasnog bilja, s najznačajnijim uzročnicima bolesti. Cvjećarstvo je kao grana biljne proizvodnje vrlo staro i razvijalo se zajedno s ljudskim rodom, a bolesti su, iako se to ponekada ne čini tako, iznimno važne u proizvodnome ciklusu cvijeća i ukrasnoga bilja. Bolesti su opisane po skupinama uzročnika (gljive, bakterije i virusi). Unutar skupina paraziti su svrstani prema sistematskoj pripadnosti pa su na taj način izbjegnuta ponavljanja, jer jedan uzročnik može parazitirati i više od deset različitih vrsta biljaka. Za svakog su uzročnika bolesti opisani simptomi koje izaziva na napadnutim biljkama, što je popraćeno fotografijama te razvojni ciklus i mjere zaštite. Na kraju knjige nalaze se Rječnik stručnih izraza i pojmova te Stručni i udomaćeni nazivi cvijeća i ukrasnog bilja. U udžbeniku su prikazana saznanja mnogih stručnjaka i znanstvenika, ali i vlastitog istraživačkog rada.The academic textbook Diseases of Flowers and Decorative Plants introduces the most important casual agents of flower and decorative plant diseases to students at all study levels, as well as to floriculturists. Floriculture as a branch of plant production is a very old discipline that was developed along with human mankind. Although it may seem otherwise, diseases are extremely important in plant production cycle. Diseases elaborated in the present handbook are classified according to their casual agents (fungi, bacteria and viruses). Parasites are organized according to their systematic grouping within separate classes, thus avoiding repetitions, as one parasite can attack different plant sorts. Disease symptoms appearing on attacked plants, development stages and protection measures are presented for each casual agent. The textbook is also well illustrated with photographs. The list of professional terminology and the list of scientific and common names for flowers and decorative plants are provided at the end of the handbook. Besides results of the authors’ own researches, this academic textbook comprises up-to-date findings of well known scientists and professionals

The effect of Ca/Zn stabilizers on the thermooxidative degradation poly(vinyl chloride) /chlorinated polyethylene blends

Termooksidacijska razgradnja mješavina poli(vinil-klorida) (PVC) i polimernoga modifikatora kloriranoga polietilena (CPE) istraživana je metodama diferencijalne pretražne kalorimetrije i termogravimetrije u dinamičkim i izotermnim uvjetima. Ustanovljeno je da istraživani sastavi mješavina PVC-a i CPE-a (sadržaja klora 42 %) nisu mješljivi. U temperaturnom području od 50 do 650 ºC termooksidacijska razgradnja mješavina zbiva se kroz dva temeljna razgradna stupnja. U prvome, do 400 ºC, osnovne reakcije su dehidrokloriranje PVC-a i CPE-a, premda se brzine i mehanizam razgradnje polimera znatno razlikuju. Istraživan je utjecaj Ca/Zn karboksilata različitih omjera kalcija i cinka na toplinsku postojanost komponenata mješavine. Ca/Zn karboksilati stabiliziraju PVC mijenjajući mu brzinu i mehanizam razgradnje, ali istodobno utječu i na razgradnju polimernoga modifikatora CPE-a.The thermooxidative degradation of blends of poly(vinyl chloride) (PVC) and polymeric modifier chlorinated polyethylene (CPE) was investigated by means of differential scanning calorimetry (DSC) and thermogravimetry (TG) under dynamic and isothermal conditions. The immiscibility of PVC and CPE (chlorine content 42 %) was established for all the investigated compositions of the blends. The thermooxidative degradation of PVC/CPE blends in temperature range of 50 – 650 ºC occurs in two basic degradation steps. In the first, up to 400 ºC, the main degradation reactions are dehydrochlorination of PVC and CPE, but the rates and mechanisms of the polymer degradation are significantly different. The influence of Ca/Zn carboxylates with different Ca/Zn ratios, on thermooxidative stability of the blends components was also investigated. Ca/Zn carboxylates stabilize PVC by changing its degradation rate and mechanism, but, at the same time, these stabilizers influence the degradation of the polymeric modifier CPE

Modeliranje peristaltičkog transporta urina u ureter

Radom je obuhvaćen razvoj matematičkog modela peristaltičkog gibanja fluida u ljudskom ureteru. U prvom dijelu rada dan je biološki opis uretera kao dijela mokračnog sustava, geometrija uretera te mehanička svojstva. Također, dan je opis propulzije urinarnog bolusa kao rezultata razmatranog fenomena peristaltičkog strujanja. U sklopu rada razvijen je programski kôd u softverskom paketu MATLAB koji opisuje peristaltičko strujanje urina u ureteru. Kôd se temelji na matematičkom modelu sustava diferencijalnih jednadžbi rješavanih pomoću Ruge-Kutta metode, posebno izrađenom u okviru ovog diplomskog rada. Također, dan je matematički opis modela te pretpostavke na kojima se model temelji. U matematičkom modelu se kao varijabla pojavljuju otpor prestrujavanja urina iz elementa u elelment, brzina širenja aktivacijskog vala, period aktivacijske funkcije, površina uretera pri pelvisu u trenutku aktivacije, elastičnost stjenke i promjena tlaka otvaranja elemenata po duljini uretera. Na kraju je istražen utjecaj navedenih varijabli na duljinu i površinu bolusa te maksimalni protok ejekcije urina u mjehur