On Some Rare Coins from the Khwarezm Hoard of 13th Century

Two silver dirhams of Khwarezm, dated to 670 AH/1271AD, with an unusual tamga are analyzed in the article.The coins come from a hoard located in the territory of Turkmenistan, the exact place of discovery being unknown.On both coins under consideration, a new, previously unknown type of tamga has been discovered.Typologically, it belongs to the Chi

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Multiple bilateral paratubal cysts and recurrent bilateral fallopian tube torsion in a premenarchal female: A case report

Introduction: Paratubal cysts are rare cystic structures that are usually asymptomatic; rarely, they may cause torsion of the adnexa.Case presentation: We report the case of a 13-year-old premenarchal female who presented with left lower quadrant abdominal pain for 4 days.She had a history of a previous right fallopian tube cyst and torsion 9 month

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Improving Mechanical Oscillator Cooling in a Double-Coupled Cavity Optomechanical System with an Optical Parametric Amplifier

We investigate the cooling phenomenon of a mechanical oscillator in a double-coupled cavity optomechanical system.Our model includes two single-mode optical cavities.The left cavity is an optomechanical system with an optical parametric amplifier, and the right cavity is a standard optical cavity.The two optical cavities couple with each other by e

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