A two-year study of U.S. counties found that residents with adequate access to parks and recreational facilities slightly increased their physical activity levels, but the relationship was stronger in counties that had largely white, non-Hispanic populations and higher median incomes.

Mergers and acquisitions can transform a company’s future. For family businesses, those decisions hinge on more than financial calculations—they reflect how families balance control, identity and risks.

With the advancement of Internet applications, the global demand for broadband satellite communication services is incessantly escalating. Furthermore, there exists an exponential surge in the requisition for the capacity of satellite communication systems. In response to this evolving demand, the domain of satellite communication technology is progressively evolving toward the realm of high-throughput satellite (HTS) communication systems. The typical technical characteristics of HTS are: (a) the satellite adopts multibeam technology for beam overlapping coverage of the service area, which improves the quality of the wireless link while realizing the spatial dimension segmentation; (b) based on this, the system adopts multiple frequency multiplexing to improve the communication capacity of a single satellite; (c) the gateway station is tightly coupled with the user beam clusters are tightly coupled to complete 2-hop communication, which makes multiple gateway stations share the communication resources of the same satellite, forming a spatial isolation of the gateway stations, and once again realizing the frequency multiplexing of the gateway station links. A key requirement for future multibeam broadband satellite communication systems is the ability to flexibly adjust beam capacity according to changes in business distribution, in order to meet time-varying business requirements. Beam hopping technology provides an efficient solution to achieve the efficient use of frequency resources and power resources. At the same time, the use of beam hopping makes the beam hopping of satellite payload need to match the business signals of ground signal stations, bringing about the need for synchronization of beam hopping between satellite and ground.

The transportation sector, the second-largest emitter of global greenhouse gases, is undergoing a transformation with electrification and subsidies aimed at reducing its carbon footprint. Yet, a critical aspect often overlooked is the role of logistics in global trade and how geopolitical decisions can undermine these efforts. This study sheds light on the impact of suboptimal logistics on greenhouse gas emissions, using recent geopolitical restrictions between Russia and Western countries since 2022 and a scenario of reduced trade through the Red Sea observed in 2024.