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Investigations on influence of rifle automatics system action on values of energetic efficiency coefficient of muzzle brakes

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Defence Technology（防务技术） 2022年第10期18卷 1741-1747页

作者： Radoslaw Trebinski Zbigniew Leciejewski Jacek Kijewski dawid gozdzik Damian Szupienko Military University of Technology Faculty of MechatronicsArmament and Aerospaceul.Gen.S.Kaliskiego 200-908WarszawaPoland

The objective of the paper was to compare values of the muzzle brake efficiency coefficient for a rifle with active or inactive automatics *** laboratory stand designed for investigating the recoil process was *** motion of the rifle was detected by the use of the laser interferometer and the optical *** recoil velocity time courses were determined by smoothing and differentiation of experimental position *** results of the experiments indicated that in the case of an active automatics system two values of the recoil velocity can be used for calculation of the energetic efficiency coefficient:the maximum recoil velocity and the final recoil velocity at the end of the automatics action *** values of the coefficient,calculated using these two values of the recoil velocity,distinctly ***,it was shown that their values indicate the same relation between the efficiency of various muzzle *** value of the efficiency coefficient,determined on the basis of the final recoil velocity value,is practically the same as that determined on the basis of the final recoil velocity value for the rifle with an inactive automatics system.

关键词： Ballistics Muzzle brakes Automatic rifle Efficiency Recoil velocity

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Cell therapy of a patient with type Ⅲ Osteogenesis imperfecta caused by mutation in COL1A2 gene and unstable collagen type I

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Open Journal of Genetics 2013年第1期3卷 49-60页

作者： Marcin Majka Magdalena Janeczko Jolanta gozdzik Danuta Jarocha Aleksandra Augusciak-Duma Joanna Witecka Marta Lesiak Halina Koryciak-Komarska Aleksander L.Sieron Jacek Jozef Pietrzyk Department of Transplantation UJCMKrakowPoland Department of Pediatrics and Medical Genetics Chair of PediatricsUJCMKrakowPoland Department of Clinical Immunology UJCMKrakowPoland Department of General and Molecular Biology and Genetics Medical University of SilesiaKatowicePoland Network of CoE BioMedTech Poland

The allogenic bone marrow derived mesenchymal stem cells transplantation was given to the newborn girl diagnosed with osteogenesis imperfecta type III, with multiple bone fractures, extreme shortness and limbs deformities. The treatment was performed at the age of 4 and 6 weeks. The clinical diagnosis was supported by biochemical analysis of collagen type I recovered from culture medium of cultivated patient’s skin fibroblast, which revealed its triple helix instability at temperature about 2?C lower than normal. Sequencing of both genes encoding procollagen type I revealed heterozygous substitution G23569Ain COL1A2 gene causing change of glycine at position 517 to aspartate. The donor of mesenchymal stem cells was the girl’s father. She received two intravenous infusions of suspended cultured mesenchymal cells in 16 days apart without any side effects. An analysis of procollagen type I secreted to the culture medium by bone marrow-derived mesenchymal stem cells obtained from the patient, 3 months following transplantation revealed its normal triple helix stability. During the subsequent two years of follow up two new bone fractures were noted. Currently a two-year-old girl’s presents extreme growth and weight deficiency. The motoric development is also retarded, but the patient constantly improves and makes progresses.

关键词： Bone Mineralisation Cell Therapy Collagen Type I Osteogenesis Imperfecta Triple Helix Stability

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