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Topic Review
Algae-Based Biofuels
Microalgal biomass has gained a significant role in the development of dif-ferent high-end (nutraceuticals, colorants, food supplements, and pharmaceuticals) and low-end products (biodiesel, bioethanol, and biogas) due to its rapid growth and high carbon-fixing effi-ciency. Therefore, microalgae are considered a useful and sustainable resource to attain energy security while reducing our current reliance on fossil fuels. From the technologies available for obtaining biofuels using microalgae biomass, thermochemical processes (pyrolysis, Hydrothermal Liquefaction (HTL), gasification) have proven to be processed with higher viability, because they use all biomass. However, due to the complex structure of the biomass (lipids, carbohydrates, and proteins), the obtained biofuels from direct thermochemical conversion have large amounts of heteroatoms (oxygen, nitrogen, and sulfur). As a solution, catalyst-based processes have emerged as a sustainable solution for the increase in biocrude production. 
  • 766
  • 11 Jan 2021
Topic Review
Algae-Powered Buildings
Environmental pollution, global warming, energy consumption, and limited natural resources are some key factors from which the built environment faces interrelated problems and their management plays a vital role in sustainability. Application of bioactive elements on buildings’ façades is a novel approach for solving the problems. Algae building technology (ABT) is an innovative approach to energy efficiency in the built environment.
  • 1.0K
  • 02 Mar 2023
Topic Review
AlGaN Ultraviolet (UV)-B/-C Lasers
The development of electrically pumped semiconductor diode lasers emitting at the ultraviolet (UV)-B and -C spectral bands has been an active area of research over the past several years, motivated by a wide range of emerging applications. III-Nitride materials and their alloys, in particular AlGaN, are the material of choice for the development of this ultrashort-wavelength laser technology. Despite significant progress in AlGaN-based light-emitting diodes (LEDs), the technological advancement and innovation in diode lasers at these spectral bands is lagging due to several technical challenges. 
  • 1.1K
  • 22 Jul 2021
Topic Review
Alger-Class Cruiser
The Alger class comprised three protected cruisers of the French Navy built in the late 1880s and early 1890s; the three ships were Alger, Isly, and Jean Bart. They were ordered as part of a fleet program that accorded with the theories of the Jeune École, which proposed a fleet based on cruisers and torpedo boats to defend France. The Alger-class cruisers were intended to serve a long-range commerce raiders to attack enemy merchant shipping. The ships were armed with a main battery of four 164 mm (6.5 in) guns supported by six 138 mm (5.4 in) guns and they had a top speed of 19 to 19.5 knots (35.2 to 36.1 km/h; 21.9 to 22.4 mph). After entering service, Alger and Isly were assigned to the Northern Squadron, while Jean Bart operated with the Mediterranean Squadron until 1895, when she, too, joined the Northern Squadron. That year, Alger and Isly were sent to French Indochina, and they were followed by Jean Bart followed in 1898. By that time, Alger had returned to France to serve in the Mediterranean. Jean Bart was present in the Far East during the Boxer Uprising in Qing China the following year, by which time Isly had been transferred to the North Atlantic station. Alger embarked on a second tour in East Asia in the mid-1900s, though records of when she left France are unclear. Jean Bart was wrecked off the coast of the Western Sahara in 1907 and could not be refloated. Isly was converted into a depot ship in 1909 and Alger was hulked in 1911; the former was sold to ship breakers in 1914, but Alger remained in the French Navy's inventory until 1939.
  • 562
  • 05 Dec 2022
Topic Review
Algorithms for Liver Segmentation in Computed Tomography Scans
Oncology has emerged as a crucial field of study in the domain of medicine. Computed tomography has gained widespread adoption as a radiological modality for the identification and characterisation of pathologies, particularly in oncology, enabling precise identification of affected organs and tissues. However, achieving accurate liver segmentation in computed tomography scans remains a challenge due to the presence of artefacts and the varying densities of soft tissues and adjacent organs.
  • 266
  • 15 Mar 2024
Topic Review
Algorithms in Tomography and Related Inverse Problems
In the ever-evolving landscape of tomographic imaging algorithms, a diverse array of themes shaping the field’s progress. It encompasses foundational principles, special innovative approaches, tomographic implementation algorithms, and applications of tomography in medicine, natural sciences, remote sensing, and seismology. This choice is to show off the diversity of tomographic applications and simultaneously the new trends in tomography. Accordingly, the evaluation of backprojection methods for breast tomographic reconstruction is highlighted. After that, multi-slice fusion takes center stage, promising real-time insights into dynamic processes and advanced diagnosis. Computational efficiency, especially in methods for accelerating tomographic reconstruction algorithms on commodity PC graphics hardware, is also presented. In geophysics, a deep learning-based approach to ground-penetrating radar (GPR) data inversion propels us into the future of geological and environmental sciences. 
  • 97
  • 20 Feb 2024
Biography
Ali T. Alouani
The University of Tennessee Knoxville, USA Ph.D. Degree in Electrical & Computer Engineering. (Dec, 1986) Thesis title: Implementation of Nonlinear Centralized Estimators in a Distributed Fashion. Research Areas: Autonomous Systems, Sensor Data Fusion, Medical Diagnosis Support Systems, EV Battery Safety, Smart Grid Monitoring Ecole Nationale d’Ingénieurs de Tunis, Tunisia, Ingénieur Prin
  • 724
  • 11 Nov 2022
Topic Review
Alkali-Activated Materials
Alkali-activated materials (AAM) have been introduced as an eco-friendly alternative to conventional binders with fewer environmental impacts. AAM reduce the need for Ordinary Portland Cement (OPC) by substituting it with supplementary cementitious materials (SCM), and therefore, reducing the amount of subsequent carbon emissions. Alkali activation is a complex chemical process between the precursors (alumino-silicate materials) and their dissolution in the activators. The activator and the precursor are two essential components of AAMs. The first step towards the new generation binder is understanding the precursors, alkali activators, alkali activation solution, and alkali activation mechanism.
  • 879
  • 12 May 2023
Topic Review
Alkaline–Surfactant–Polymer Flooding Mechanisms
Chemical flooding, expecially  alkali–surfactant–polymer (ASP) injection plays an important role in enhancing oil recovery under many synergetic mechanisms, in which there are four main mechanisms that have been widely used, including improving the mobility ratio between the heavy oil and the displacing phase, lowering the interfacial tension between oil and water (IFT), altering the rock wettability (oil-wet to water-wet) and emulsifying oil and water. Laboratory tests and pilot trials of ASP injection showed that the oil recovery of the emulsified system is 5% more than the cases where no emulsions existed. 
  • 1.3K
  • 28 Nov 2022
Topic Review
Alkenyl Succinic Anhydride
Alkenyl Succinic Anhydride (ASA) is a sizing agent used in papermaking to increase the water repellency of paper. Almost 60 years after the introduction of the chemical in papermaking, scientists still have differing views on how ASA interacts with cellulose. Several experiments were conducted to bring more clarity to the ASA sizing mechanism, especially on the contentious question of ASA-cellulose covalent bonding or the esterification reaction between ASA and cellulose during papermaking.
  • 656
  • 07 Jul 2023
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