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Journal of Media Research, 2013
Scientific Culture 10.2, pp. 49-68, 2024
This paper presents the first preliminary isotopic data of skeletal (animal and human) remains recovered from Tomb A at the Mycenaean archaeological site of Kastrouli (Phocis) during the excavation periods from 2016 to 2021. The study also reports the results of the osteological analysis (minimum number of individuals, sex and age-at-death estimation) of several prenatal and adult bone fragments which were found commingled with animal remains in Tomb B, and Buildings 1 and 2. The majority of the animal remains were identified as domesticated species, i.e. Ovis aries, Capra hircus, Bos taurus and Sus scrofa domesticus. Other animal species present were Alectoris, Lepus, and a few different species of gastropod shells (Cerithium, Tarantinaea lignaria, Patella sp.). Isotopic analysis (δ13C, δ15N) of 12 humans and four animals with good quality collagen indicates a mixed diet incorporating significant amounts of domestic animal protein, plants (some potential evidence for C4), and possibly some marine contribution, all of which are archaeologically documented.
2020
Since the time of their appearance on the Earth, humans have been interested in the cosmos and the discovery of the secrets of the sky. The emergence of Islam and the tendency of the Islamic Khalifas towards the science of astronomy and astrology led to the growth and development of this branch of natural sciences, especially between the 3rd and 9th centuries AH. In the present study, astronomical concepts and beliefs in the Islamic era have been identified and extracted in order to compare them with the astronomical motifs of the two illustrated versions of Book of Fixed Stars (820 AH) by Abd al-Rahman al-Sufi, the original version of which belongs to the 4th century AH and Nativities (700 AH) by Abu Ma'shar Balkhi. The present research aimed to find out how the components of astrology and constellations are depicted in the two illustrated versions of Nativities (700 AH) and Book of Fixed Stars (9th century AH) and whether the images of the Nativities were influenced by the ref...
2021
Background and Objectives: Dielectric Barrier discharge (DBD) is a suitable method to generating Non-thermal plasma at atmospheric pressure, which utilizes Pulsed power supplies as exciters. Increasing pulse voltage range and frequency and compactness are important issues that should be taking into consideration. Methods: The high voltage pulse generators which are introduced in the literature have some disadvantages and complexities such as need of additional winding to reset the transformer core and operating under hard switching which increases electromagnetic noise and loss. The leakage inductance of the high voltage transformer increases the rise time of the pulse which is undesirable for DBD applications. The energy stored in the leakage inductance causes the voltage spike across the switch, witch necessitates the use of snubber circuits. The main contribution of this paper is a new high voltage pulse generator with the following characteristics, 1) a capacitor is paralleled with the main switch to reset the transformer core and to provide the soft switching condition for the switch. 2) The resonant charging technique is used which doubles the secondary winding voltage which reduces the turns ratio of high voltage transformer for a certain output pulse peak. 3) The sharpening circuit using magnetic switch produces a sharp high voltage pulse. Results: The proposed high voltage pulse generator is designed and simulated using Pspice software. To verify the theoretical results, a prototype with the input voltage 48 V, the output voltage pulse 1.5 kV, and the rise time of the output pulse 50 ns is constructed and tested. Conclusion: This paper proposes a new pulse generator (PG). The proposed PG uses three techniques named forward, resonant charging, and magnetic switch to produce a high-voltage nanosecond pulse. The resonant charging double the secondary voltage of the pulse transformer, which causes reduction in turn ratio of the pulse transformer and decreases the weigh, volume, and price of the PT. The magnetic switch section finally produces a nanosecond high-voltage pulse. The magnitude of the output pulse can be varied using the input source voltage, the MS reset current and the duty cycle. The core of the pulse transformer resets by using a capacitor paralleled with the switch and the PG does not need any additional reset winding like the conventional DC-DC forward converter.
ResearchGate + "Ameracian Pohod na Rusiju" (a book), 2022
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