Climate change modulates the effects of solar UV radiation on biogeochemical cycles in terrestrial and aquatic ecosystems, particularly for carbon cycling, resulting in UV-mediated positive or negative feedbacks on climate. Possible positive feedbacks discussed in this assessment include: (i) enhanced UVinduced mineralisation of above ground litter due to aridification; (ii) enhanced UV-induced...

Space weather research involves the study of the Sun and Earth from a systems viewpoint to improve the understanding and prediction of solar-terrestrial variability. There are a wide variety of solar-terrestrial imagery, spectroscopic measurements, and in situ space environmental data that can be exploited to improve our knowledge and understanding of the phenomena and processes involved in spa...

This report is a literature survey that investigates the effect of feedback on the capacity region of multiple access channels (MAC) and broadcast channels (BC).

The key ideas in the theory of broadcast channels are illustrated by discussing some of the progress toward finding the capacity region. The capacity region is still unknown.

Studies of the UV-radiation are the most actual ecological problems that are called by ozone depletion increasing the level of biologically active solar UV-B radiation in the biosphere. The air pollution and atmospheric aerosols prevent penetrating appropriate dose UV radiation, which is beneficial for people, specifically due to production of vitamin D3 in skin from its precursor 7dehydrochole...

The Space Telecommunication Radio System (STRS) architecture is being developed to provide a standard framework for future NASA space radios with greater degrees of interoperability and flexibility to meet new mission requirements. The space environment imposes unique operational requirements with restrictive size, weight, and power constraints that are significantly smaller than terrestrial-ba...

The study examines the effect of several television ownership attributes on the fraction of prime-time broadcast television minutes devoted to different programming types, as well as the effect of these ownership attributes on prime-time broadcast advertising minutes and rates. Overall, the study considers an interesting question with appropriate data and methods and should ultimately prove use...

Terrestrial microalgae evolved a variety of photoprotective strategies enabling life on land. This includes the production sunscreen compounds, which shield cells from excess radiation. Here, ...