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Topic Review
Vertical Barriers for Land Contamination Containment
Soil pollution is one of the major threats to the environment and jeopardizes the provision of key soil ecosystem services. Vertical barriers, including slurry trench walls and walls constructed with soil mix technology, have been employed for decades to control groundwater flow and subsurface contaminant transport.
  • 922
  • 30 Jan 2022
Topic Review
Smart Manufacturing
The Fourth Industrial Revolution drives industries from traditional manufacturing to the smart manufacturing approach. In this transformation, existing equipment, processes, or devices are retrofitted with some sensors and other cyber-physical systems (CPS), and adapted towards digital production, which is a blend of critical enabling technologies. In the current scenario of Industry 4.0, industries are shaping themselves towards the development of customized and cost-effective processes to satisfy customer needs with the aid of a digital twin framework, which enables the user to monitor, simulate, control, optimize, and identify defects and trends within, ongoing process, and reduces the chances of human prone errors. 
  • 921
  • 16 Sep 2021
Topic Review
Fundamentals of Microwave Technology in Catalyst Production
The fundamentals and mechanisms of microwave irradiation are fundamentals of microwave technology. Two mechanisms of the microwave technology, electric field and magnetic field heating, which make microwave irradiation unique and potentially viable in numerous fields are included as well. These aspects are essential to be understood prior to investigating microwave-absorbing catalysts for the production of biofuel. With the outstanding benefit of microwave heating, the active sites of catalysts or entire catalysts can be heated selectively to enhance the catalytic performance. In the case of microwave-unabsorbing material, selective heating of the catalyst will result in heat transfer to organic solvents and eventually increases the conversion yield. The kinetic rate by microwave irradiation was higher than conventional heating by 1.15 times.
  • 921
  • 17 Nov 2022
Topic Review
Process Intensification in Chemical Reaction Engineering
Process intensification (PI) is defined as an innovative principle applied in chemical reaction engineering and process design. The first definitions were given in 2000, when the pioneering work of Stankiewicz and Moulijn began this means of novel enthusiastic definition of chemical processes, which can bring significant benefits in terms of process and efficiency, higher quality of products, lower capital and operating expenses, less waste, and improved process safety. Starting from that moment, several roadmaps, books, and scientific papers were published in the field, focused on PI in the chemical industry.
  • 920
  • 14 Jan 2022
Topic Review
Embedded Machine Learning
Embedded machine learning (EML) can be applied in the areas of accurate computer vision schemes, reliable speech recognition, innovative healthcare, robotics, and more. However, there exists a critical drawback in the efficient implementation of ML algorithms targeting embedded applications. Machine learning algorithms are generally computationally and memory intensive, making them unsuitable for resource-constrained environments such as embedded and mobile devices. In order to efficiently implement these compute and memory-intensive algorithms within the embedded and mobile computing space, innovative optimization techniques are required at the algorithm and hardware levels. 
  • 920
  • 01 Nov 2021
Topic Review
Civil Aviation Occurrences
The nature of a civil aviation occurrence may be defined in three different categories while considering its severity. General categories include civil aviation accidents, serious incidents and incidents.
  • 920
  • 16 Jun 2021
Topic Review
Beneficiation of Rare Earth Elements
The rapid depletion of high-grade rare earth elements (REE) resources implies that future supplies may be augmented with low-grade ores, tailings, and other unconventional resources to meet cut-off grades and, subsequently, supply demands. There are distinct differences in the beneficiation response of REE and gangue minerals in the tailings. Gravity, wet magnetic, and froth flotation separation methods produced significantly varying REE recoveries and upgrades. Tabling presented a better potential for REE minerals upgrade compared to the Knelson Concentrator (KC). However, wet magnetic separation produced two REE “rich” preconcentrates. The two REE preconcentrates were subsequently upgraded via froth flotation. In terms of recovery, the best result was achieved during the multistage flotation process carried out on the tailings “feed” in the presence of hydroxamic acid and depressants. With high recoveries obtained using such readily available conventional separation methods, the tailings provide additional REE value to the primary commodities.
  • 920
  • 24 May 2022
Topic Review
Cistus ladanifer as a Potential Feedstock for Biorefineries
Cistus ladanifer (rockrose) is a widespread shrub species in the Mediterranean region well known due to its production of labdanum gum, especially in the hot season. Its leaves and branches can be subjected to different extraction and distillation processes to produce various types of extracts. The natural extracts of C. ladanifer have several applications, especially in the perfumery and cosmetics sector. C. ladanifer extracts, in addition to presenting interesting odoriferous properties, are also known for their bioactive properties, such as antioxidant and antimicrobial. The use of this species in animal feed or phytostabilisation of mining areas has also been successfully applied. Furthermore, the lignin and polysaccharides that are the major fractions from Cistus residues can be relevant sources of high-value products in a biorefinery framework.
  • 919
  • 02 Feb 2023
Topic Review
List of Thor and Delta Launches (2010–19)
As of October 2018, only the Delta IV remains in production. Single-stick versions of Delta IV was retired in 2019 and replaced by Atlas V, leaving the Delta IV Heavy the only remaining operational member of the Delta family, flying defense missions.
  • 919
  • 21 Nov 2022
Topic Review
NiFe Oxide Electrocatalyst
NiFe electrodes are developed for the oxygen evolution reaction (OER) in an alkaline electrolyser based on an anion exchange membrane (AEM) separator and fed with diluted KOH solution as supporting electrolyte. This study reports on the electrochemical behaviour of two different NiFe-oxide compositions (i.e., Ni1Fe1-oxide and Ni1Fe2-oxide) prepared by the oxalate method. These catalysts are assessed for single-cell operation in an MEA including a Sustainion™ anion-exchange membrane. The electrochemical polarization shows a current density of 650 mA cm−2 at 2 V and 50 °C for the Ni1Fe1 anode composition. A durability test of 500 h is carried out using potential cycling as an accelerated stress-test. This shows a decrease in current density of 150 mA cm−2 mainly during the first 400 h. The performance achieved for the anion-exchange membrane electrolyser single-cell based on the NiFeOx catalyst appears promising. However, further improvements are required to enhance the stability under these operating conditions.
  • 918
  • 30 Dec 2020
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