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Topic Review
Green Hydrogen Value Chain
The potential of H2 as a fuel with the highest energy density per unit mass makes it great for application in all sectors that require energy. H2 is produced from a wide range of resources using different raw materials, pathways, and technologies, including fossil fuels and renewable energy. The classical method consists of breaking or reforming fossil fuels as a profitable H2 production pathway for industrial use, which was estimated (globally) at 85 million tons in 2016 (more than 600 billion Nm3/year). Therefore, the energy value of H2 and the clean energy index were not the main factors to consider in its use at an industrial level. Industrial H2 was used for the production of fertilizers, petrochemical refining, metalworking, food processing, cooling of generators of power plant energy and semiconductor manufacturing.
  • 590
  • 07 Jan 2022
Topic Review
Diurnal Extrema Timing—A New Climatological Parameter
Diurnal Extrema Timing (DET) are daily occurrence times of air temperature minimum and maximum. Although unrecognized and unrecorded as a meteorological variable, the exact timing of daily temperature extrema plays a crucial role in the characterization of air temperature variability. The results reveal the timing of daily air temperature maximum as the most vulnerable to climate change among temperature and timing extrema indices.
  • 589
  • 12 Jan 2022
Topic Review
Removal of Emerging Contaminants from Municipal Wastewater
The presence of emerging organic contaminants (EOCs) in the environment is increasing and requires the development of technologies for their effective removal. EOCs can be classified into a wide variety of groups depending on their chemical structures and end uses. A popular group of EOCs are pharmaceutically active compounds (PhACs). The growing use of PhACs is leading to persistence and prolonged exposure of these compounds in the environment, which may eventually affect the enzymatic and metabolic mechanisms of living organisms.
  • 589
  • 19 Sep 2022
Topic Review
FreedomWorks
FreedomWorks is a conservative and libertarian advocacy group based in Washington D.C., United States . FreedomWorks trains volunteers, assists in campaigns, and encourages them to mobilize, interacting with both fellow citizens and their political representatives. It is widely associated with the Tea Party movement.
  • 589
  • 10 Oct 2022
Topic Review
Grove Mountains CM-Type Chondrites
CM chondrite is the most important carbonaceous chondrite containing abundant Ca, Al-rich inclusions (CAIs) and other interesting objects, which probably experienced early condensation processes in the Solar Nebula environment and later alteration in parent body surroundings. Thus, it is a vital raw material to explore in the formation and evolution of the early Solar System. Grove Mountains (GRV) CM chondrites have been collected from Antarctica by Chinese Antarctic Research Expedition (CARE) for nearly 20 years.
  • 589
  • 30 Dec 2022
Topic Review
Green and Low-Carbon Rural Development in China
Green and low-carbon rural development (GLRD) is becoming an important way to explore sustainable development in rural areas of China. It is significant for the sustainable development of the rural economy and of society to build a rural carbon sink system, advocate low-carbon emissions in rural areas, and promote the development of rural green industries and rural transformation.
  • 589
  • 13 Feb 2023
Topic Review
Health Effects of PM2.5
Particulate matter (PM) is a widespread air pollutant, consisting of a mixture of solid and liquid particles suspended in the air, covering a wide range of sizes and chemical compositions. Among ambient air pollutants most commonly investigated are PM with diameters < 10 μm and <2.5 μm (PM2.5, PM10).
  • 589
  • 17 Apr 2023
Topic Review
Vascular Cambium
The vascular cambium is the main lateral meristem responsible for the secondary growth of trees. There are a number of explicit and implicit assumptions behind this statement which allow questions to be raised about the mechanism underlying the radial growth of trees. Based on the hypothesis of the diurnal strains of plant organs, it is anticipated that the process of radial growth can be understood as an adaptation to the cyclically changing mechanical stress in the radial direction generated by the phloem during the 24 h day cycle.
  • 589
  • 24 Jul 2023
Topic Review
Legionella and Biofilms
Legionella is responsible for the life-threatening pneumonia commonly known as Legionnaires’ disease or legionellosis. Legionellosis is known to be preventable if proper measures are put into practice. Despite the efforts to improve preventive approaches, Legionella control remains one of the most challenging issues in the water treatment industry. Legionellosis incidence is on the rise and is expected to keep increasing as global challenges become a reality. This puts great emphasis on prevention, which must be grounded in strengthened Legionella management practices. The perpetuation of a water focused monitoring approach and the importance of protozoa and biofilms are bottom-line questions for reliable Legionella real-field surveillance. Under this scope an integrated monitoring model is proposed to study and control Legionella at water systems, by combining discrete and continuous information about water and biofilm. Although the successful implementation of such model requires a broader discussion across the scientific community and practitioners, this might be a starting point to build more consistent Legionella management strategies that can effectively mitigate legionellosis risks by reinforcing a pro-active Legionella prevention philosophy.
  • 588
  • 23 Jun 2021
Topic Review
Medicine Lake Volcano
Medicine Lake Volcano is a large shield volcano in northeastern California about 30 mi (50 km) northeast of Mount Shasta. The volcano is located in a zone of east-west crustal extension east of the main axis of the Cascade Volcanic Arc and the Cascade Range. The 0.6 mi (1 km) thick shield is 22 mi (35 km) from east to west and 28 to 31 mi (45 to 50 km) from north to south, and covers more than 770 sq mi (2,000 km2). The underlying rock has downwarped by 0.3 mi (0.5 km) under the center of the volcano. The volcano is primarily composed of basalt and basaltic andesite lava flows, and has a 4.3 by 7.5 mi (7 by 12 km) caldera at the center. The Medicine Lake shield rises about 3,900 ft (1,200 m) above the Modoc Plateau to an elevation of 7,795 ft (2,376 m). Lavas from Medicine Lake Volcano are estimated to be at least 140 cu mi (600 km3) in volume, making Medicine Lake the largest volcano by volume in the Cascade Range (Newberry Volcano in Oregon has the second largest volume). Lava Beds National Monument lies on the northeast flank of the volcano. Medicine Lake Volcano has been active for 500,000 years. The eruptions were gentle rather than explosive like Mount St. Helens, coating the volcano's sides with flow after flow of basaltic lava. Medicine Lake is part of the old caldera, a bowl-shaped depression in the mountain. It is believed that the Medicine Lake volcano is unique, having many small magma chambers rather than one large one.
  • 588
  • 21 Nov 2022
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