526 research outputs found

    Physicochemical investigation of NiAl with small molybdenum additions

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    Specimens of four cast NiAl alloys, three of them containing 0.5, 1.0 and 1.5 at. % Mo., were homogenized for 10, 10, and 140 hr at 1373, 1523 and 1273 K, respectively, then kept at 1073, 1173 and 1323 K for 60, 120 and 3 hr, respectively, and quenched in icy water. The precipitation of a metastable Ni3Mo phase was observed at temperatures between 1073 and 1523 K. Molybdenum substituted for nickel was found to inhibit the lattice disordering in NiAl at 1073 and 1523 K

    Risk minimisation methods in shaping the optimal range of treadmills

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    The article presents a solution to the problem of integrating risk minimisation methods in the process of forming the optimal range of treadmill models in a retail enterprise. The problem of multi-criteria optimisation was solved using the generalised criterion method. The formulated problem was therefore broken down into a number of specific tasks, each of which was solved by selecting specific methods. Risks were minimised by mathematical methods, taking into account the economic performance of the enterprise. Recommendations were also offered for customers wishing to purchase one of the treadmill models chosen from the analysis and the best option for ordering via the online shop with home delivery

    Fungicidal effect of apokampic discharge plasma jet on wheat seeds infected with Alternaria sp. and Bipolaris sorokiniana Shoemaker

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    Atmospheric pressure plasma jets generated by apokamp discharge (APPJ AD) in ambient air was investigated for the improvement of growth parameters of spring wheat seeds («Irgina» cultivar) and for inhibition of potentially phytopathogenic fungi on seeds surface. In case of APPJ AD, active forms of oxygen and nitrogen (as well as the radiation of molecules) are formed in the air of atmospheric pressure, which increases their concentration in the streamer head by orders of magnitude, compared to traditional APPJ based on inert gases. Owing to this, we believe to concentrate action of active forms of oxygen and nitrogen in situ, on the biological target. In our case, this can intensify the processes of inactivation of microscopic mold fungi on the surface of seeds. We tested our hypothesis on wheat seeds infected with helminthosporiosis (Bipolaris sorokiniana Shoemaker) with a degree of infection of 50% and early blight (Alternaria sp.), whose infection rate was 10%. In the first case, the seeds were treated by apokamp plasma for 1 and 10 minutes. It provided a significant reduction in the degree of infection of seeds with helminthosporiosis by 1.7 and 2.3 times. In comparison with check variant, the treated seeds maintained high rates of viability and germination energy. In the second case, it was possible to completely inactivate alternariosis pathogens within 3 min of treatment. In addition, it is shown that the action of APPJ AD caused a statistically valid elongation of the roots of wheat seedlings. A hypothesis is proposed to explain the found effects. The potential advantages of APPJ AD in the task of seed surface treatment in comparison with other known atmospheric plasma techniques are discussed

    Validation of a complex needs indicator for veterans in the UK using a composite indicators’ method

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    Objective: To construct an indicator for assessing the complexity of UK veterans’ needs. Study design: Cross-sectional, secondary analysis. Methods: The study applied principal component (PCA) analysis as the method to determine the weights of different needs based on their interactions with each other, the effectiveness of the model was evaluated using bootstrapping. The dataset on UK veterans’ support provided by the “Soldiers, Sailors, Airmen and Families Associations” (SSAFA) (N = 35,208) was considered. The grant applications for different categories of support were used as indicators of different needs. The dimensions of breadth (number of different needs) and depth (number of grant applications to address the need) were incorporated in the assessment of complexity. Results: The complex needs indicator for the current sample was validated. The majority of cases had a complexity score of 1 or less. Conclusions: The research suggested and tested an assessment method for the complexity of veterans’ needs, that may be positively associated with higher risk of adverse health outcomes. This indicator can be used by decision-makers for risk stratification of the veteran population, thus supporting the allocation of resources in a more effective way

    Physiological action of UVB radiation on wheat seeds and sprouts (Triticum aestivum L.)

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    This work continues the cycle of our research on the physiological effect of UVB radiation on plants. Two research cycles were conducte

    Prospects for the creation of antimicrobial preparations based on copper and copper oxides nanoparticles

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    The spread of strains of microorganisms that are multidrug resistant to modern antimicrobial drugs is still an urgent problem in the treatment and prevention of infectious diseases and public health in general.Currently, the possibility of using metal nanopreparations in various fields of medicine is being actively studied. Nanoparticles of metals and metal oxides are promising antimicrobial agents and are attracting growing interest due to their effectiveness. Nanoscale copper metal particles have shown high antimicrobial activity againstvarious types of gram-positive and gram-negative bacteria, as well as fungi. Taking into account the potential of copper nanoparticles in antimicrobial therapy, we present an overview of the current state of research related to their antimicrobial properties, consideration of the mechanisms of action, key factors affecting antimicrobial activity, including the polymer matrix. The issues of toxicity and resistance to copper are considered. The advantage of copper nanoparticles over other metal nanoparticles is shown.The studies summarized in this review have shown the promise of copper nanoparticles in the creation of new antimicrobial drugs that can be used in the future to control, prevent, and treat various diseases
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