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Topic Review
Small-Scale Rice Processing in Nigeria
Rice processing is an important part of Nigeria’s agricultural sector and has the potential to bring significant value to the country. Rice is a staple food in Nigeria and an important food and calorie source for the population.
  • 365
  • 19 Jan 2024
Topic Review
Small RNA GcvB
Small non-translated regulatory RNAs control plenty of bacterial vital activities. The small RNA GcvB has been extensively studied, indicating the multifaceted roles of GcvB beyond amino acid metabolism.
  • 453
  • 29 Nov 2021
Topic Review
Small Public Urban Green Spaces for Mental Restoration
Small public urban green space (SPUGS) was defined as urban public spaces which did not exceeding 5,000 m2 in size with vegetation and their own entrance. Exposure to SPUGS has been demonstrated to have mental benefits for older adults. However, studies on identifying the objective environmental features of SPUGS and their effects on mental restoration for older adults remain limited. The research results showed that: (1) Both the green view index, and the boundary enclosure had a strong impact on the mental restoration of older adults; (2) The colorfulness index showed the strongest relationship with the vitalizing effect. (3) Sky view factor and, number of seats only influenced the ROS score, while the results of revitalization suggest that large areas of water should be avoided. (4) Physiological Equivalent Temperature (PET) was also confirmed to have negative effects on the psychological health of seniors in autumn. 
  • 459
  • 20 May 2022
Topic Review
Sludge Treatment Reed Beds
Sludge Treatment Reed Beds (STRB) represent a state-of-the-art nature-based solution to sludge treatment and management. It is an effective, economical (i.e., of low investment, operation and maintenance cost, and low energy consumption), environmentally friendly, and technically efficient technology. In STRBs, the sludge is applied to a growing stand of reeds under controlled conditions. The method relies on the exploitation of the transpiring and aerating capabilities of the reeds, which absorb moisture and nutrients from the sludge for their growth. Additionally, the sludge is dewatered by drainage through the underlying gravel layers, and evaporation from the sludge surface. In the long run, the sludge is oxidized and its organic matter content decreases. The final solids content of the dewatered sludge can build up to and exceed 40%, depending on the sludge loading rate and the climate. STRB operational life is usually at least 30 years and is divided into two or three operational phases of 8-12 years. At the end of each operational phase, the accumulated residual sludge is removed and recycled typically in agriculture and the STRB is emptied.
  • 1.7K
  • 01 Apr 2021
Topic Review
Sludge Co-Pyrolysis Technology
Pyrolysis, one of the main technologies for sludge treatment, has the advantages of thorough treatment, volume minimization, and the recovery of high-value products. However, sludge pyrolysis is often associated with problems such as high volatility and low ash content, as well as poor application performance of pyrolysis residues. Co-pyrolysis technology has reduced pyrolysis energy consumption and improved the range and quality of pyrolysis product applications.
  • 438
  • 28 Jun 2022
Topic Review
Slow Sand Filtration for Raw Water Treatment
Filtration methods are traditional techniques of water purification used by mankind since ancient times. By filtering, water can be cleaned of sand, silt, turbidity, scale, and other suspended particles. Modern slow sand filters (SSFs) for water purification were first used in the 19th century in England. Therefore, they are often called English filters. The first slow filter was built by the English engineer James Simpson in 1829 in London to purify water from the river Thames.
  • 1.7K
  • 02 Jun 2023
Topic Review
Skeletal Transformations and the Origin of Baleen Whales
Mysticeti or baleen whales are a group of cetaceans including a few extant species in only six genera. Despite their scarce diversity, baleen whales represent key species in the trophic webs of the oceans as they are able to sequester enormous quantities of carbon and to disseminate nutrients that support large planktonic blooms. The study of their evolution is thus crucial to understand how and when the ecological characteristics of today’s oceans came to be.
  • 405
  • 06 Apr 2022
Topic Review
Sirente Crater
The Sirente crater (Italian: Cratere del Sirente) is a small shallow seasonal lake in Abruzzo, central Italy. The depression, which is located at the center of the Prati del Sirente, a mountainous highland north of the Sirente massif in the Apennines, is 13 km (8.1 mi) from the village of Secinaro. Its formation has prompted a number of theories in recent years. Although in the absence of shock-metamorphic and / or geochemical evidence it is not yet possible to confirm the meteoritic impact theory, no other theories for the origin of this geological structure have been proven yet. Interest in the Sirente crater began in the late 1990s after Swedish geologist Jens Ormö, an impact crater specialist, noticed ridges near the site that indicated a bolide collision. A research team named "The Sirente Crater Group" along with two scientists from the International Research School of Planetary Science of Pescara (IRSPS) began a detailed examination of the area. The team concluded the meteorite struck the Earth with the force of a small nuclear bomb; approximately one kiloton in yield. The blast would have created a mushroom cloud and shockwaves similar to a nuclear explosion.
  • 586
  • 02 Nov 2022
Topic Review
Sinkhole
A sinkhole, also known as a cenote, sink, sink-hole, swallet, swallow hole, or doline (the different terms for sinkholes are often used interchangeably), is a depression or hole in the ground caused by some form of collapse of the surface layer. Most are caused by karst processes – the chemical dissolution of carbonate rocks or suffosion processes. Sinkholes vary in size from 1 to 600 m (3.3 to 2,000 ft) both in diameter and depth, and vary in form from soil-lined bowls to bedrock-edged chasms. Sinkholes may form gradually or suddenly, and are found worldwide.
  • 1.5K
  • 11 Oct 2022
Topic Review
Single-Particle Analysis of Atmospheric Aerosols
Atmospheric aerosols, produced as a consequence of different anthropogenic and natural processes, impart significant control over the global energy budget, climate, and human-environmental health. Their size varies across the nano-micrometer scale. Based on their origin, they may be classified into primary or secondary aerosols. Biomass burning, incomplete combustion of fossil fuels, volcanic eruptions, and traffic-related and wind-driven suspensions contribute to primary aerosol emissions. In contrast, gas-to-particle conversion within the atmosphere leads to secondary particle production. The study of atmospheric aerosols is vital to the field of atmospheric research. The dynamic nature (highly variable concentration composition and size with space and time) of aerosols makes them difficult to investigate. Today, aerosol research involves the application of various spectrometric and spectroscopic techniques. The single-particle analysis of aerosol is yet a challenge. The merits and demerits of various offline and online techniques used for aerosol research are discussed in a nutshell. Mass spectrometric techniques fail in distinguishing certain species.
  • 503
  • 10 Nov 2022
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