This work reports the effectiveness of TiO2 photocatalysts modified by defect engineering methods. The prepared photocatalysts were characterized by X-ray diffraction (XRD), UV–Vis diffuse ...reflectance spectroscopy (DRS), photoluminescence (PL) measurements and electron spin resonance (ESR) technique. The immobilized photocatalyst layer was prepared using an abrasive material as a support and a mineral binder. To the best of our knowledge, this is the first time that such type of the immobilized photocatalytic layer has been prepared and tested. A home-made flat-plate photoreactor (FPP) with artificial light sources was used for the degradation of an aqueous solution of imidacloprid using an immobilized TiO2. The effects of different operating variables such as irradiation source, recirculation flow rate, irradiated surface area and photoreactor volume on the photocatalytic performances were investigated. The hydrodynamic behavior of the flat-plate photoreactor (FPP) was studied utilizing a residence time distribution (RTD) technique using the axial dispersion model. Based on kinetic measurements it was found that the photocatalytic degradation of imidacloprid under the conditions used in this study can be described by a complex kinetic model that follows pseudo-zero order kinetics at the beginning of the degradation, and with the progress of the reaction at higher irradiation times changes to the pseudo-first order. Liquid chromatography - quadrupole time‐of‐flight mass spectrometry (LC‐QTOF‐MS) was used to identify imidacloprid degradation by-products as a function of irradiation time. Theoretical modeling of the geometry and electronic structure of imidacloprid in aqueous solution was performed using density functional theory (DFT) calculation. Based on the results of theoretical simulations and experimental measurements, the possible pathway for photodegradation of imidacloprid in aqueous phase after irradiation with UVA was proposed and discussed.
Display omitted
•The TiO2 photocatalysts were modified using the deffect engineering methods.•This is the first report utilizing abrasive material as support and mineral binder to prepare the photocatalyst.•Hydrodynamic behaviour of the flat-plate photoreactor was studied.•Imidacloprid electronic structure is investigated by DFT calculation.•Possible pathway for imidacloprid photodegradation under UVA irradiation was proposed.
Monografija Grad i obred. Zadarska svetišta i njihova liturgija od 5. do 11. stoljeća, autorice Ane Mišković, prva je monografska publikacija u hrvatskoj znanosti u kojoj se ranokršćanska i ...ranosrednjovjekovna sakralna baština nekog užeg područja proučava s aspekta liturgije koja se odvijala unutar crkve, ali i izvan nje, na području cijeloga grada.
Sakralni kontinuitet na lokalitetu gdje je danas smještena pravoslavna crkva Uspenja Presvete Bogorodice u Drnišu može se pratiti od 17. stoljeća pa sve do danas. Najstariji poznati prikaz sakralne ...građevine na tom lokalitetu ucrtan je na skici katastarske mape Drniša iz 1710. godine. U sljedećim dvama stoljećima doći će do promjena na samom sakralnom objektu koji će, uslijed trošnog stanja, biti zatvoren 1888. godine, a potom i srušen 1898. godine. Kako se crkva već koncem osamdesetih godina 19. stoljeća nalazila u ruševnom stanju, prvi prijedlozi nacrta nove crkve nastaju već 1890. godine, ali do njihove realizacije neće doći zbog velikih financijskih troškova. U konačnici, projekt nove pravoslavne crkve bit će ostvaren prema nacrtima Ćirila Metoda Ivekovića iz 1908. godine.
In the preserved records from the Venetian rule in Drniš, in the late seventeenth century, but even during the eighteenth century, one can find mention of three Roman-Catholic churches: St. Anthony, St. Barbara, and St. Rocco. Besides these churches, preserved sources mention one more church that provided spiritual care for the newcomers, who declared themselves as believers di rito Greco. The oldest pictorial representation of this church by di rito Greco is preserved in the sketch of the cadastral plan of Drniš from 1710. In this sketch the church is marked as Chiesa di sant’Maria d’Grecij. Since the last written mention of this church dates from 1741, it is not possible to trace its historical development until 1828, when the church was included in the Austrian cadastral map. In the view of the fact that the church from the beginning of the eighteenth century differs from its representations from the nineteenth century, question arises whether it was the same church, or the building undergone some architectural upgrades over the time, or it was a completely new church built sometime between 1741 and 1828. The analysis has revealed that due to its poor condition, the church was closed in 1888, later demolished in 1898, and a new church was built in its place. The first plans for the new Orthodox church were made by the Construction Department of Knin in 1890, but these plans were not accepted due to the high costs. The project of the new Orthodox church was finally completed in 1897 by the famous Croatian architect Ćiril Metod Iveković. After Iveković's project was approved by the Ministry of Theology and Education in 1898, the construction of the church began in the summer of 1899, on the occasion of the feast of the Assumption (August 28). Nine years will pass from the blessing of the foundation stone in 1899 to the blessing of the new church. The reason for such a long time of building the new church was lack of financial assets. Finally, the church was ceremonially opened and blessed on June 21, 1908.
This article presents the results of automatic detection of dust impact signals observed by the Solar Orbiter – Radio and Plasma Waves instrument. A sharp and characteristic electric field signal is ...observed by the Radio and Plasma Waves instrument when a dust particle impacts the spacecraft at high velocity. In this way, ∼ 5–20 dust impacts are daily detected as the Solar Orbiter travels through the interplanetary medium. The dust distribution in the inner solar system is largely uncharted and statistical studies of the detected dust impacts will enhance our understanding of the role of dust in the solar system. It is however challenging to automatically detect and separate dust signals from the plural of other signal shapes for two main reasons. Firstly, since the spacecraft charging causes variable shapes of the impact signals, and secondly because electromagnetic waves (such as solitary waves) may induce resembling electric field signals. In this article, we propose a novel machine learning-based framework for detection of dust impacts. We consider two different supervised machine learning approaches: the support vector machine classifier and the convolutional neural network classifier. Furthermore, we compare the performance of the machine learning classifiers to the currently used on-board classification algorithm and analyze 2 years of Radio and Plasma Waves instrument data. Overall, we conclude that detection of dust impact signals is a suitable task for supervised machine learning techniques. The convolutional neural network achieves the highest performance with 96 % ± 1 % overall classification accuracy and 94 % ± 2 % dust detection precision, a significant improvement to the currently used on-board classifier with 85 % overall classification accuracy and 75 % dust detection precision. In addition, both the support vector machine and the convolutional neural network classifiers detect more dust particles (on average) than the on-board classification algorithm, with 16 % ± 1 % and 18 % ± 8 % detection enhancement, respectively. The proposed convolutional neural network classifier (or similar tools) should therefore be considered for post-processing of the electric field signals observed by the Solar Orbiter.
Predgrađe dubrovačke Civitas Peković, Željko; Babić, Kristina
Anali Zavoda za povijesne znanosti Hrvatske akademije znanosti i umjetnosti u Dubrovniku,
05/2017
55/1
Paper, Journal Article
Recenzirano
Odprti dostop
Predgrađe dubrovačke civitas je, usprkos objavljenim radovima, i dalje tema s mnogo nepoznanica. Ovim radom autori su se dotaknuli samo nekih. Polazeći od problema ubikacije starog i novog gradskog ...bedema prema brdu, koji predstavljaju okvir područja reguliranog 1272, autori su revidirali prethodna i ponudili nova tumačenja odredaba 41. glave pete knjige i 57. glave osme knjige Statuta grada Dubrovnika iz 1272, te njegove novele iz 1296. godine, kojima su regulirane ulice južno od Place. Na temelju dokumenata iz Spisa dubrovačke kancelarije, ponuđeni su i prijedlozi ubikacije pojedinih terena i kuća koje su spomenute u statutarnim odredbama.
The possibility of meteoroid impact is one of the main threats to the interplanetary missions. Although the meteoroids in the interplanetary space have very small masses, their velocities are ...extremely large and can produce highly energetic impacts. In this paper, a specific method to analyze the meteoroid environment on the transfer trajectories to Mars has been developed, by determination of the closest approach situation for a large sample of meteoroid orbits. This allows to analyze, not only the integral flux of meteoroids on the spacecraft surfaces, but also the specific kinematics for every single approach and the distributions of important variables such as relative velocity and its projections on specific directions such as instantaneous directions to Mars, Earth, Sun and apex. The obtained results give the quantitative and qualitative estimate of these variables which are separated for different populations of interplanetary meteoroids. The most exposed parts of the spacecraft on the Hohmann transfer to Mars are directed toward Mars, apex and anti-Earth point while the Sun and anti-Sun directions are symmetrically threatened. This gives the frame for the mission design and impact risk assessment and for the development of mathematical models of the behavior of the new spacecraft protection materials under impact loading and also for their experimental examination.
Teza danskog arhitekta Ejnara Dyggvea o postojanju takozvane arijanske katedrale u Saloni potaknula je živu raspravu koja traje sve do današnjih dana. Cilj je teksta revidirati teorijska polazišta ...Dyggveove teze, kao i kasnija razmišljanja o istaknutom problemu, te na temelju zasad oskudnih raspoloživih podataka ponuditi neke nove smjerove istraživanja i predložiti nekoliko kasnoantièkih crkava u Dalmaciji kojih su naručitelji možda mogli biti Istočni Goti.
The hypothesis, put forward by the Danish architect Ejnar Dyggve, about the existence of the so-called Arian cathedral continues to be the subject of lively debate. This paper aims to revise the theoretical starting points of Dyggve’s hypothesis including some subsequent attitudes towards this important i ssue. Starting from the scarcely available data at present, it also offers some new directions for research as well as a hypothesis that several Late Antique churches in Dalmatia were actually commissioned by the Ostrogoths.
Cedomir Milic, from father Jovan Milic and mother Soka Milic (maiden Govedarica), was born on March 23rd 1886 in Mostar, and killed on November 22nd 1941 near Niksic. Since the founding of first ...Serbian gymnastic society “Obilic” in Mostar in 1904 (since 1910 known as “Serbian Sokol (hawk)”), Milic was involved in its work and dedicated his whole life to sokol and national work. Through sokol and fraternity societies he fought for spiritual and physical strengthening of his people. He was deeply respected, not only by sokols and brothers (members of the fraternity), but also by the intellectuals of that time. Among his numerous sokol activities, he also gave great contribution to education and specialization of sokol staff on the territory of Herzegovina during Austro-Hungarian occupation, and also in Sokolism in the time of Kingdom of Serbs, Croats and Slovenians (since 1929 Kingdom of Yugoslavia). The goal is to highlight and research the role of Cedomir Milic in education and specialization of sokol staff. Numerous sources from the time of Milic’s life and work, as also sources originated after that, were reviewed and analyzed.
The authors display the results of architectural and conservation research conducted in 2000/2001 in the eastern part of the historical core of Dubrovnik, in today’s Church of Our Lady of Carmen, ...which is in Pustijerna, directly by the fortress of St. John. Research has found the earlier Church of St. John which was destroyed over time. Stone furniture and archive records of the 13th century bare witness to the existence of the church. The remains have given enough data for the recognition and graphic reconstruction of the three development phases of the church, from the 8/9th century to the romanesque period. The Church of St. John is layered over the baroque gate of Our Lady of Carmel. Its present appearance is due to the last remodelling after the earthquake of 1667, in which it was severely damaged. The first construction stage began between 1633 – 1634. During the research, the foundations of the rounded facade were found, including part of the first stage of baroque church construction. There was a project change in the middle of the century. A flat facade was built and the church was re-arched with an elliptical dome. The dome fell in an earthquake in 1661. The renewal took place within the then possibilities of the brotherhood: an overlapping wooden roof with a visibly coloured wooden lintel, imitations of stone pilasters and a wreath made in painted wood. The church is furnished with altars and valuable altarpieces by: Giovanni Angelo Canin (built in 1641), Andrea Vaccaro (1606 – 1610), Sebastiano Rici (1659 – 1734), and an overhead picture by Bartolomeo Litterini (1669 – 1748). It was also furnished with pictures of the Four Evangelists by Matteo Preti (1613 – 1699). It is unknown who the architect was that in 1622 designed the church with the rounded facade over which rose an elliptic dome with a lantern.
The aging of the population represents one of the biggest challenges that modern society is facing, which has resulted in the world’s scientific community showing increasing interest in health and ...quality of life. The aim of this research was to determine the effects of resistance training with elastic bands on improving the quality of life of institutionalised older adults. The study included 22 older adults who were divided into two groups: the experimental group (n=13), and the control group (n=9). The research results indicate that programmed resistance training with elastic bands is an effective tool in improving and advancing the quality of life of institutionalised persons, specifically in relation to physical functioning, energy/fatigue, emotional well-being, social functioning, pain, and general health, in favour of the experimental group of subjects.
PDF
