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Topic Review
Microplastic Migration
Microplastic pollution in aquatic ecosystems has drawn attention not only because microplastics are likely to accumulate anywhere but also because they cause negative impacts both to aquatic biota and, indirectly, to public health, as a result of their presence. Between diffuse and point sources, there are a variety of paths for microplastics to migrate through riverine environments, traverse transition environments between fresh and salty water sites and finally enter sea waters then accumulate along marine environments. On the other hand, plastic particles can also be transferred to other environments through percolation through the soil until they reach subterranean reservoirs and, finally, emerge in the most different ecosystems.
  • 748
  • 31 Jan 2023
Topic Review
Silica’s Impact on Concrete Properties in Civil Engineering
Microsilica, a by-product of silicon or ferrosilicon production. Widely utilized within the construction industry, microsilica serves as a modifying component in concrete production, leveraging its chemical composition and physical attributes as a highly active pozzolan. Natural additives encompass crushed volcanic and sedimentary rocks, diatomites, volcanic ash, and tuff. Within technogenic additives lie waste or by-products from various industries, such as fly ash, granulated blast furnace slag, and microsilica.
  • 748
  • 11 Dec 2023
Topic Review
Ecological Environment in Belt and Road Initiative Regions
With the widespread recognition and in-depth implementation of the Belt and Road Initiative (BRI), especially in the context of global climate change, the ecological environment of Belt and Road Initiative regions might be confronted with pressures and challenges with rapid socioeconomic development. In response to those potential environmental challenges, China has put forward Green BRI and enriched the new Silk Road with more environmental connotations, aiming to reduce the conflict between economic development and eco-environmental protection.
  • 748
  • 03 Jan 2023
Topic Review
Mining Effects on the Karst
Karst develops on soluble rocks (limestone, dolomite, and evaporite). The infiltrating water with carbonic acid creates cavities (caves), fills them, and flows towards the mountain margin (karst water), where it emerges in springs. The infiltrated water constitutes a three-dimensional system whose surface is the karst water level, which undergoes fluctuation of various degrees and periods due to natural and artificial effects, at another time a one-way rise or subsidence. Since karst rocks drain water, neither a surface water network nor valleys develop (they are only formed at sites where the valley is inherited from the non-karstic cover or when the karst water level is situated at the valley floor). The dissolved material is transported into the karst with the infiltrating waters; therefore, surface karst features are closed. These are karren, dolines, ponors with blind valleys, and poljes. The material transported in the solution precipitates as freshwater limestone.
  • 747
  • 05 Dec 2022
Topic Review
Properties and Applications of Geopolymer Mortar
Classic cement mortar is often utilised as a standard binding and repairing material in various engineering structures. Many scholars have addressed GPM’s viability and potential applications as a suitable replacement for regular cement mortar. Sathonsaowaphak was the first to investigate geopolymer mortar and studied the properties of bottom ash fineness, ash/liquid alkali ratio, NaOH/Na2SiO3 ratio, NaOH dosage, water to ash ratio, and superplasticiser on the behaviour in terms of workability and compressive strength of GPM. Geopolymer mortar has a mechanical strength of 24–58 MPa, and adding NaOH solution improves the workability performance of GPM without reducing strength. According to the results of Detphan and Chindaprasirt, who prepared GPC using rice husk ash and fly ash and activated by NaOH and NaSiO3 solution as a liquid for the mix, they found that the maximum strength of GPM is acquired by employing a Na2SiO3-to-NaOH mass ratio of four. Moreover, more discussion about geopolymer mortar properties is reported in the following Content.
  • 747
  • 05 Dec 2022
Topic Review
Gas Emissions from Arctic Permafrost
The active emission of gas (mainly methane) from terrestrial and subsea permafrost in the Russian Arctic has been confirmed by ample evidence. A generalization and some systematization of gas manifestations recorded in the Russian Arctic is carried out. The published data on most typical gas emission cases have been summarized in a table and illustrated by a map. All events of onshore and shelf gas release are divided into natural and man-caused and the natural ones are further classified as venting from lakes or explosive emissions in dryland conditions that produce craters on the surface. a description of the observed man-caused gas manifestations associated with the drilling of geotechnical and production wells in the Arctic region is given.
  • 747
  • 29 Oct 2020
Topic Review
Sarahsaurus
Sarahsaurus is a genus of basal sauropodomorph dinosaur which lived during the Early Jurassic period in what is now northeastern Arizona, United States.
  • 746
  • 23 Nov 2022
Topic Review
Removal of Pesticides from Waters
Pesticides are pollutants found in wastewater due to increasing agricultural activities over the years. Inappropriate dosing of pesticides results in the dispersal of active ingredients in the environment. The complete removal of pesticides from wastewater is an immediate concern due to their high toxicity and mobility. At present, adsorption is one of the most widely used methods for pesticide removal, in which synthetic zeolites and mesoporous silica materials are extensively applied. This article presents a systematic and comparative review of the applications and comparison of these adsorbents, based on the data reported in the literature.
  • 746
  • 07 Jul 2021
Topic Review
Data Quality Supporting Marine Mineral Oil Spill Assessments
Spilled mineral oils in the marine environment pose a number of challenges to sampling and analysis. Mineral oils are complex assemblages of hydrocarbons and additives, the composition of which can vary considerably depending on the source oil and product specifications. Further, the marine microbial and chemical environment can be harsh and variable over short times and distances, producing a rigorous source of hydrocarbon degradation of a mineral oil assemblage. Researchers must ensure that any measurements used to determine the nature and extent of the oil release, the fate and transport of the mineral oil constituents, and any resultant toxicological effects are derived using representative data that adhere to the study’s data quality objectives (DQOs).
  • 745
  • 11 Mar 2022
Topic Review
Myron Ebell
Myron Ebell is a climate change denier who serves as the Director of Global Warming and International Environmental Policy at the Competitive Enterprise Institute (CEI), a libertarian advocacy group based in Washington, D.C. He is also the chairman of the Cooler Heads Coalition, a loose coalition formed in 1997 which presents itself as "focused on dispelling the myths of global warming by exposing flawed economic, scientific, and risk analysis". In September 2016, he was appointed by then Republican presidential candidate Donald Trump to lead his transition team for the United States Environmental Protection Agency (EPA). In these organizations, Ebell has been central in promoting climate change denial, distributing his views to the media and politicians. Ebell, who is not a scientist, has been described as a climate change skeptic, a climate contrarian and a climate change denier. Ebell claims that he advocates "for sensible energy policies that benefit everyone. Instead of policies that simply reacts [sic] to alarmism."
  • 745
  • 21 Nov 2022
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