Showing 581 - 600 results of 28,320 for search '"physics"', query time: 0.11s Refine Results
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    Underwater acoustic communication physical layer key generation scheme by Jingmei LIU, Zhiwei SHEN, Qingqing HAN, Jingwei LIU

    Published 2019-02-01
    “…To ensure the communication safety of unmanned underwater vehicle,a physical layer key generation scheme of underwater acoustic channel based on orthogonal frequency division multiplexing (OFDM) system was proposed.First,a local pilot assistance channel sounding protocol was proposed to solve the reciprocity impaired caused by the great propagation delay in the underwater acoustic channel,ensure high key randomness and enhance the defenses against nearby eavesdroppers.Secondly,double-layer compensation centralized combined with adaptive guard interval quantization method was proposed to improve key agreement rate and key generation rate.Simulation results show that the scheme effectively overcomes the problems of impaired reciprocity and ensures high key generation rate and high randomness on the premise that the key agreement is superior to the existing schemes.…”
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    SOCIAL ASPECTS OF PHYSICAL CULTURE AND SPORTS IN THE NORTH CAUCASUS REGION by V. Doev

    Published 2016-01-01
    “…We consider some of the factors shaping the physical quality and health savings of the nation.…”
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    Physical activity and metabolic syndrome in primary care patients in Spain. by Rafael Manuel Micó-Pérez, Natalia Hernández Segura, Vicente Martín-Sánchez, Alfonso Barquilla-García, Sonsoles M Velilla-Zancada, José Polo-García, Miguel Ángel Prieto-Díaz, Vicente Pallares-Carratala, Antonio Segura-Fragoso, Leovigildo Ginel-Mendoza, Sergio Cinza-Sanjurjo

    Published 2025-01-01
    “…<h4>Purpose</h4>To determine the relationship between self-reported physical activity and the components of premorbid metabolic syndrome in patients treated in primary care according to sex.…”
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    The impact of nutritional status on centenarians’ physical, mental, and functional health by Ivan David Lozada-Martinez, Laura Vindas-Meza, Sandra Castelblanco-Toro, Juan Carlos Salazar-Uribe, Juan-Manuel Anaya

    Published 2025-04-01
    “…Conclusions: This study identified that nutritional status in centenarians is associated with functional and cognitive status, physical performance, use of dental prostheses, and specific biochemical and anthropometric variables. …”
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    Integrated collaborative filtering recommendation in social cyber-physical systems by Jiachen Xu, Anfeng Liu, Naixue Xiong, Tian Wang, Zhengbang Zuo

    Published 2017-12-01
    “…Cyber-physical systems are becoming part of our daily life, and a large number of data are generated at such an unprecedented rate that it becomes larger than ever before in social cyber-physical systems. …”
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    Integrating nutrition and physical activity promotion: A scoping review. by Laura Casu, Stuart Gillespie, Nicholas Nisbett

    Published 2020-01-01
    “…<h4>Background</h4>This paper investigates actions that combine nutrition and physical activity which hold potential for 'double duty action' to tackle multiple forms of malnutrition simultaneously. …”
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