52 research outputs found
The environmental history of a former salt town in Transylvania (Sic, Northern Romania)
The medieval market-town of Sic (Szék in Hungarian) was an important Transylvanian settlement due to its remarkable salt mining. The impact of the mining activities on the environment and the history of water management were investigated based on a palaeoecological study, performed on the large Reedbed of Sic (Stufărişurile/Nádas-tó). We found that in the last 3000 years the anthropogenic impact has been continuous in the territory, but the types and intensity of the disturbances changed with time. The most notable environmental transitions took place after 1000 AD, suggesting a significant intensification of salt mining. Forest cover significantly drop, but salt concentration and the frequency of halophytic species in the investigated marshland increased during the Late Middle Ages. The dominance of halophytic marshland species reached their peak in the 17th century. This coincides with the apogee of mining activities and human lake management. The most remarkable deforestation occurred in the 18th century, when the present-day landscape with negligible forest cover was developed
Photometric and Spectroscopic Investigations of the Galactic Field RRc Candidates V764 Mon and HY Com
By analyzing photometric and spectroscopic time series, we show that the pulsator V764 Mon, assumed to be the brightest RR Lyr star in the sky, is in fact a rapidly rotating δ Sct star with an unusually long dominant period (P1=0.29 d). Our spectroscopy confirmed the binarity of V764 Mon discovered by the Gaia satellite. In the case of HY Com, a bona fide RRc star, we present its first complete radial velocity curve. Additionally, we found that the star continues its strong phase variation reported before
Spectroscopic and photometric time series of the bright RRc star T Sex
We present spectroscopic time series observations on one of the brightest northern RRc stars, namely T Sex. Additionally, we also analysed extended photometric data sets, particularly the recent observations of the TESS space telescope. The main findings of our studies are as follows: T Sex, unlike all RRc stars whose space photometry has been analysed, shows only the 0.5fx frequency as an additional pulsation frequency. With this, T Sex may be the first represent of such rare RRc stars found from space photometry. The spectroscopic data show a periodic distortion of the H α line with the pulsation phase. This phenomenon has not been reported for any RR Lyrae stars. The characteristic line distortion is probably caused by the turbulent convection, which resulted in higher macroturbulent velocity for T Sex than that for typical RRab stars. Line doubling of the Na D line was observed between the 0.37 and 0.80 pulsation phases. The explanation of this phenomenon is that the two absorption components originate from different sources. The redder component comes from the pulsating atmosphere of the star, while the bluer one comes from the interstellar space. At phase 0.438, we detected emission on the Na D line, which may indicate a weak shock wave
A mezőgazdasági termékek felvásárlási folyamatának szimulációja, különös tekintettel a cukorrépára = The simulation of acquisition processing of agricultural products in especially consideration of sugar beet
A kutatás elméleti megalapozásához feldolgoztuk a téma irodalmát. Áttekintettük a hazai cukorrépa termelés változásait (fajták, termőterület, gépesítettség, termelési eredmények, stb.), illetve a termeltetés (szerződések, a termeléshez szükséges anyagok biztosítása, stb.) és a felvásárlás (a betakarítás és a beszállítás programozása, minősítés, stb.) problémáit. A legkorszerűbb kommunikációs eszközöket és számítástechnikát alkalmazó rendszerek közül kiemelten foglalkoztunk a MIR (Modulare Integrierte Rübenlogistik) elnevezésű logisztikai rendszerrel, és a hazai bevezetés lehetőségével. Rendszereztük a cukorrépa szállítás lehetséges megoldásait. A tanulmányban bemutattuk az Arena környezetben fejlesztett, cukorrépa betakarítási szimulációs modell felépítését és a modellalkotás lépéseit. A különböző működési szituációkban a lehetséges konfigurációkkal futtatott modellből nyert eredményeket a legígéretesebb megoldások kiválasztása céljából elemeztük. A cukorrépa depók helyének meghatározásához kifejlesztettük a probléma matematikai modelljét, majd elkészítettük annak adatbázisát és számítógépes programját is. | We elaborated the literature of topic to establish our research work. We overviewed the changes of domestic sugar beet production (varieties, production area, mechanization, yield, etc.) and problems of assignment (contracts, materials for production, etc.) and problems of buying up (harvest, scheduling of transport, qualification, etc.). We stress the importance of systems that apply most update communication and computer technology with distinguished attention to MIR (Modulare Integrierte Rübenlogistik) and we examined possibilities of its introduction in Hungary. We systematized the methods of sugar beet transportation. In our study we presented the structure of simulation model for sugar beet harvesting that was developed in Arena and we described the steps of model building. We have run our model with different situations and different configurations to analyse how our system will perform and to choose the best solutions. We developed a mathematical model to determine the number and the location of the sugar beet repositories, optimalized from the point of view of transportation and we provided for database and computer program of our model
Social Context of Late Medieval and Early Modern Deforestation Periods in the Apuseni Mountains (Romania) based on an Integrated Evaluation of Historical and Paleobotanical Records
Számítógépes növénytermelési információs és tervezési rendszer fejlesztése = Computer aided information and planning system development in plant production
A kutatásban kifejlesztett rendszer adatbázisának megtervezéséhez összegyűjtöttük a munkafolyamatokkal összefüggő információkat és rendszereztük azokat. Megterveztük és feltöltöttük a rendszer adatbázisát. Kifejlesztettük az adatok felvitelét, karbantartását és elemzését támogató moduláris felépítésű számítógép program kódját, és a modulokat az adonyi Március 21. Szövetkezetben teszteltük. A programot a szövetkezet operátorainak bevonásával az elmúlt évben már rendeltetésszerűen használtuk. A szoftver moduljai alkalmasak: táblákon történt események időrendi sorrendjének a lekérdezésére; a műveletek költségeinek elszámolására; statisztikák (traktor, személy, anyag) elkészítésére; a tápanyagmérleg kimutatására; a bérelszámolásra stb. Az uniós csatlakozást követően a területalapú támogatásokkal, illetve a gazdálkodási napló vezetésével kapcsolatban új információigények merültek fel. Ezen információk jelentős részét képezik művelési adatok, amelyek munkalapok rögzítésével egyidejűleg, a gazdálkodási naplótól függetlenül is bekerülnek a rendszerbe. Kézenfekvőnek látszott, hogy a gazdálkodási napló vezetését integráljuk az információs rendszerbe. A kifejlesztett szoftver legfontosabb eleme a tervező modul, amelynek az ereje abban rejlik, hogy a különböző tervváltozatok viszonylag kevés manuális munkával, nagyon gyorsan előállíthatók, így a tervezőnek az időt rabló számolás helyett több ideje marad a tervváltozatok elemzésére, a legjobb változatok kiválasztására. | Information connected with work processes was collected and systematized for planning database of the developed system in the research. The database of system was planned and filled. The modules of the computer program for filling, maintenance and analysis data were coded and the modules were tested in Adony, in a cooperative farm that name is Március 21. The computer program was used systematically by the experts and operators of cooperative farm in the last year. The modules of the software are suitable for querying events in time order which were happened in the fields, calculating costs of operation, making statistics about tractors, workers, used materials and wage accounting. After joining EU new demand on information emerged relation to territorial support and keeping farming diary. The considerable part of this information is operation data that are filled in the system simultaneously the data of the worksheets independently farming diary. Therefore it seemed to be evident that keeping farming diary to be integrated into the information system. The most important element of the developed software is the planning module, that is a powerful tool to generate plan variations with little manual work and very quickly. In this way instead of the manually calculation the planner has a lot of time for analysing the plan variations and choosing the best variation
Emerging Mediaeval Heritage: Environmental History Research at Băgău (c. Alba, Romania) and the Bottomless Lake (Tăul Fără Fund)
The Kepler Cepheid V1154 Cyg revisited: light curve modulation and detection of granulation
We present a detailed analysis of the bright Cepheid-type variable star V1154 Cygni using 4 years of continuous observations by the Kepler space telescope. We detected 28 frequencies using standard Fourier transform method.We identified modulation of the main pulsation frequency and its harmonics with a period of ~159 d. This modulation is also present in the Fourier parameters of the light curve and the O-C diagram. We detected another modulation with a period of about 1160 d. The star also shows significant power in the low-frequency region that we identified as granulation noise. The effective timescale of the granulation agrees with the extrapolated scalings of red giant stars. Non-detection of solar-like oscillations indicates that the pulsation inhibits other oscillations. We obtained new radial velocity observations which are in a perfect agreement with previous years data, suggesting that there is no high mass star companion of V1154 Cygni. Finally, we discuss the possible origin of the detected frequency modulations
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