Nuclear fusion in charge-asymmetric muonic molecules

Nuclear fusion reactions in hydrogen-lithium muonic molecules, $h\mu^{6,7}{\rm Li}$ (where h=p,d,t) are considered and fusion rates from rotational states J=0 of the molecules are presented. Results obtained depend on the isotopic composition of the molecules and range between $10^3 {\rm s}^{-1}$ and $10^7 {\rm s}^{-1}$. The upper limit for fusion rates from rotational states J=0 of hydrogen-helium muonic molecules, $d\mu^{3,4} {\rm He}$ and $t\mu^{3,4}{\rm He}$, equal $10^6 {\rm s}^{-1}$, is also found

Muon Transfer in Hydrogen Isotopic Mixtures

Direct and inverse muon transfer between atomic orbits of muonic hydrogen isotopes is considered in the WKB approximation. The corresponding cross sections, calculated as functions of collision energy, are different above the thresholds for the inverse transfer and approach common limits depending on the principal quantum number and hydrogen isotopes. The comparison of results obtained by integration over impact parameter and by summation over angular momentum is also presented

ITC tools supporting the durability and performance of constructions

W pracy przedstawiono wyniki badań przemysłowych prowadzonych w ramach realizacji projektu zintegrowanego systemu oceny wytężenia i żywotności konstrukcji. W pierwszej części przedstawiono wyniki badań eksperymentalnych wykonanych celem określenia podstawowych danych materiałowych niezbędnych w analizach zgodnych z procedurami FITNET. Ponadto w pracy dokonano analizy przypadków wykorzystania modułów pękanie i zmęczenie do analizy rzeczywistych komponentów maszyn wykorzystywanych w przemyśle energetycznym i wydobywczym.In the paper results of industrial research are presented. The research were performed during development project devoted to integrated for strength and lifetime assessment. In the first part of the paper results of experimental investigations on selected materials are provided. The experiments were conducted in order to identify material properties relevant for analyses according to selected FITNET procedures. In addition, use cases of fracture and fatigue FITNET modules are analysed with respect to their application in power generation and mining industry

The influence of fiber type and numbers of layers on the strength of multilayer composite pipes

W pracy przedstawiono zagadnienia dotyczące modelowania oraz obliczania wielowarstwowych nawijanych struktur kompozytowych o geometrii rurowej. Na wstępie zaprojektowano i wykonano dwa rodzaje próbek kompozytowych na bazie włókien ciągłych, szklanych i węglowych. Następnie wykonano analizę mikroskopową ich przekrojów, a na tej podstawie określono zawartość objętościową włókien w osnowie oraz wyznaczono stałe materiałowe metodą homogenizacji. W kolejnym kroku, na podstawie opracowanego modelu obliczeniowego, wyznaczono rozkłady naprężeń obwodowych oraz promieniowych w rurowych strukturach wielowarstwowych.The paper presents the issues concerning the modeling and calculation of the multilayer wound composite structures of tubular shapes. The starting point was to design and prepare two types of composite samples based on glass and carbon filaments. When it was done, the group performed a microscopic analysis of their cross sections in order to determine the volume content of the fibers in the matrix. The mechanical properties were obtained by means of a homogenization method. In the next step, distributions of radial and circumferential stress in the tubular multilayer structures were determined according to the developed computational model

Influence of housing system on the growth and histological structure of duck muscles

This study was aimed at determining the effect of housing systems on the growth, feed conversion ratio (FCR), meatiness and size of muscle fibres of Pekin (P44) and Muscovy (MR71) ducks. Each genetic group included 360 birds (180 males and 180 females). The ducks were divided into four experimental groups according to their sex and housing system: intensive system (IS) and outdoor system (OS). A significant effect of housing system on the final body weight and FCR value was noted only in P44 birds of both sexes, with OS birds having higher body weights than the IS birds. As a result, the OS MR71 drakes were characterized by a significantly higher slaughter yield, weight and content of breast muscles in the carcass. The OS MR71 ducks showed a lower slaughter yield and a higher content of leg muscles in the carcass compared to IS MR71 ducks. In contrast, the housing system had no significant effect on the meatiness of P44 ducks. A greater diameter of muscle fibres in both sexes of P44 ducks and in both sexes of MR71 ducks was observed in the OS compared to IS flocks. A greater cross section of muscle fibres was also noted in the ducks from the OS system, however with significant differences confirmed only in pectoralis superficialis and biceps femoris in MR71 drakes as well as in the biceps femoris of P44 drakes. These data show differences between duck genotypes and indicate the efficiency and potential of outdoor poultry systems.Keywords: Poultry production; outdoor system; intensive system; Pekin; Muscov