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    Wyświetlanie 1-3 z 3
    Tytuł:
    Theodosius II’s solidus from Prełuki, Sanok County in material and traseological examinations
    Autorzy:
    Biborski, Marcin
    Biborski, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2042504.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    solidus
    Electron microscope
    chemical compounds analysis
    obverse
    reverse
    traseological analysis
    graver
    coin's die
    Opis:
    The aim of the analysis of Theodosius’ II solid was to determine the chemical compounds of the coin alloy and to conduct a traseological analysis. The results show that the fineness of gold of which the coin was made was very high (obverse: 99,16% which means 23,8 karat gold and reverse of 99,20% which constitutes for the 23,81 karat gold), and the alloy metal was silver (0,65% and 0,62%). Traseological analysis has shown, that the hole in the lower part of the obverse, 2,1 mm in the diameter, was drilled with a very sharp, narrow, conical tool, the marks of which are still visible on the inside of the hole. Also, some traces of work concerning the coin’s die have been spotted. The engraving of the die was done gradually. Traces of consequent scratching with a graver are well visible both on the obverse and reverse. The character of places where sharp edges framing letters and some images are preserved serve proof of those being prepared with the use of a narrow, triangular-ended graver. All this suggests, that the maker of the die had a developed set of technical and artistic skills.
    Źródło:
    Acta Archaeologica Carpathica; 2019, 54; 285-292
    0001-5229
    2719-4841
    Pojawia się w:
    Acta Archaeologica Carpathica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of solidus and liquidus temperatures of real low carbon steel grade obtained by use of thermal analysis methods
    Porównanie temperatur solidus i likwidus stali niskowęglowej uzyskanych za pomocą metod analizy termicznej
    Autorzy:
    Smetana, B.
    Kawuloková, M.
    Zlá, S.
    Kalup, A.
    Strouhalová, M.
    Řeháčková, L.
    Rosypalová, S.
    Tkadlečková, M.
    Michalek, K.
    Dobrovská, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/181901.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Metalurgii Żelaza im. Stanisława Staszica
    Tematy:
    likwidus
    solidus
    stal
    analiza termiczna
    warunek
    metoda
    liquidus
    steel
    thermal analysis
    condition
    method
    Opis:
    Praca dotyczy badania temperatur przemian fazowych (temperatur solidus i likwidus) z użyciem różnych metod analizy termicznej. Obecnie kluczowymi metodami analizy termicznej są: różnicowa analiza termiczna DTA, skaningowa kalorymetria różnicowa oraz „bezpośrednia” analiza termiczna TA. Praca przedstawia podstawowe zasady, charakterystykę, zalety, wady i wyniki uzyskane przy użyciu tych trzech, bardzo często stosowanych metod. Przedstawiono wyniki z zakresu wysokiej temperatury (powyżej 1000°C) z naciskiem na zakres topnienia i krzepnięcia stali. Omówiono wyniki uzyskane przy zastosowaniu wspomnianych metod podczas procesu nagrzewania/chłodzenia, z uwzględnieniem różnych obciążeń analizowanych próbek i innych czynników, które mogą wpływać na uzyskane wyniki. Podano ocenę krzywych nagrzewanie/chłodzenie DTA i DSC. Porównano i omówiono uzyskane temperatury solidus i likwidus.
    The paper deals with the study of phase transition temperatures (solidus and liquidus temperatures) with the use of different thermal analysis methods. Currently, the key thermal analysis methods are DTA (Differential Thermal Analysis), DSC (Differential Scanning Calorimetry) and ‘direct’ thermal analysis (TA). The study presents the basic principles of these methods, their characteristics, advantages, disadvantages and results obtained with these three very often used methods. There paper presents results from the high temperature region (above 1000°C) with the focus on the melting and solidifying region of real steel grade – multicomponent alloy. The paper discusses results obtained with the three mentioned methods at heating/cooling process, with different loads of analysed samples and other factors that can influence the obtained results. The evaluation of heating/cooling curves, DTA and DSC – curves at heating and cooling is demonstrated. The obtained solidus and liquidus temperatures are compared and discussed.
    Źródło:
    Prace Instytutu Metalurgii Żelaza; 2016, T. 68, nr 2, 2; 33-39
    0137-9941
    Pojawia się w:
    Prace Instytutu Metalurgii Żelaza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recording recent Roman coin finds from Poland (2004-2007)
    Rejestracja znalezisk monet rzymskich z terenu Polski (2004-2007)
    Autorzy:
    Dymowski, Arkadiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/16530172.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    amateur finds
    hoards
    small finds
    group finds
    single finds
    Republican coins
    Roman coins
    denarii
    subaeratii
    gold coins
    siliqua
    solidus
    Prusice
    Rotmanka
    Drzewicz type hoards
    Opis:
    The number of new, amateur finds of Roman coins have been increasing rapidly in recent years. Researchers generally agree that coins from amateur finds are fully legitimate numismatic sources. It is estimated that non-archaeologists made no less than 90% of old discoveries of Roman coins from the area of central Barbaricum. This is also true for the beginning of the 21st century. The disadvantage of this situation lies in the fact that the lack of information about the context of most of the amateur finds significantly decrease their source value for archaeology. However, the mass representation of the material is a big advantage. In order to obtain more data on new discoveries from Poland, it was necessary to develop a project that would allow for collecting anonymous information about finds of Roman coins. The scheme of action was thus based on two kinds of activities. One of them involved searching information about the new discoveries of coins on the Internet and then expanding and verifying these data. The other involved propagating the project of recording finds as wide as it was possible in order to encourage finders to pass as much information about their discoveries as possible. During the realisation of the project, from May 2004 to November 2007, the number of 518 pieces of anonymous information had been gathered. This material comprised of 1,028 Roman coins from 448 finds. Among the newly reported finds, there were: 11 treasures and 437 small finds (113 group finds and 324 single finds). Basing on the collected data, we may assume that single finds of Roman coins are relatively rare in Poland, which can mean that they usually appear in a broader archaeological context. Unfortunately, in most cases we have no information about the context whatsoever. Some interesting observations on the collected material are worth mentioning here: • Republican denarii quite frequently occurred in small finds; • Denarii subaeratii also occurred quite frequently; we may assume that no less than 10 percent of all small finds of Roman denarii in Poland were in fact denarii subaeratii; • Three hoards similar to Drzewicz hoard were discovered in the basin of Bzura river, which may suggest that there were “Drzewicz type” hoards in that area; • The example of four hoards found in the Polish Jura suggests that hoards deposited on this territory in the Migration Period often contained a number of denarii and jewelry, including gold coins adapted for pendants. General methods of critical approach to such new material are still being developed, since information regarding the coins and the circumstances of their discovery happened sometimes to be, no matter if intentionally or not, false or distorted. Registration activities were continued in 2008 which resulted in capturing two important single finds: a siliqua of Constantius II discovered in a field in the village Prusice (commune Złotoryja) and a solidus of Arcadius found in a field in Rotmanka in the suburbs of Gdansk (6 figures, 2 tables).
    Źródło:
    Wiadomości Numizmatyczne; 2008, 52, 2(186); 195-208
    0043-5155
    Pojawia się w:
    Wiadomości Numizmatyczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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