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Topic Review
Financial Assessment of Renewable Energy Projects
Financial assessment of renewable energy projects is to help decision-makers invest in renewable energy sources (RES) technologies, it is essential to have reliable indicators capable of measuring a project’s total performance. Despite the global increase in renewable energy sources (RES) investments associated with economic and population growth, few studies have presented a comprehensive evaluation mechanism for RES projects, mainly due to the multiplicity of variables capable of influencing the viability of these endeavors. Therefore, building models that allow an efficient and holistic measurement is a difficult task.
  • 4.6K
  • 16 Feb 2022
Topic Review
Coal Fly Ash Use in Cement and Concrete
Nowadays, coal is increasingly being used as an energy source in some countries. This coal-fired generation process, however, has the disadvantage that produces large quantities of coal fly ash. Its characteristics differ depending on the combustion conditions and the coal source. Fineness will influence early compressive strength in cement-based materials. The finer the binding material, the higher the early compressive strength. They can be used to produce high-volume fly ash (HVFA) concrete, self-compacting concrete (SCC), concrete for marine infrastructures, pervious concrete, roller compacted concrete (RCC) and so on.
  • 4.6K
  • 14 Dec 2021
Topic Review
Genome Organization
In higher-order organisms, the genome is assembled into a protein-dense structure called chromatin. Chromatin is spatially organized in the nucleus through hierarchical folding, which is tightly regulated both in cycling cells and quiescent cells. Assembly and folding are not one-time events in a cell’s lifetime; rather, they are subject to dynamic shifts to allow changes in transcription, DNA replication, or DNA damage repair.  Chromatin is regulated at many levels and recent tools have permitted the elucidation of specific factors involved in the maintenance and regulation of the three-dimensional (3D) genome organization.
  • 4.6K
  • 14 Apr 2021
Topic Review
List of AEW&C Aircraft Operators
Airborne early warning and control (AEW&C) aircraft are airborne radar systems designed to detect and track aircraft, missiles, ships and vehicles and provide command and control to direct friendly forces. Some operators, such as the Royal Air Force refer to such aircraft as Airborne early warning (AEW), while others reserve the shorter name for AEW aircraft lacking command and control facilities.
  • 4.6K
  • 03 Nov 2022
Topic Review
Nitrogen Compounds in the Soil
Soil is an important environment in which nitrogen is transformed. The nitrogen cycle in the soil depends on microorganisms, without them, nitrogen transformation processes cannot occur. They determine the continuity of the circulation of this element in the environment and ensure the renewal of its resources. The presence of microorganisms involved in nitrogen transformation in the soil, their activity and the intensity of the reactions taking place are influenced by many factors, including the type of soil, moisture, oxygenation, pH, vegetation and fertilization. 
  • 4.6K
  • 31 May 2021
Topic Review
Biopolymers’ Processing Methods
The biopolymer functionality depends on several factors apart from their structure and composition, such as the type, quality, and quantity of the solvent used and the processing technique used to build the final structure that will determine the interaction of the materials. The main processing techniques for bio-based polymers from renewable sources are discussed in detail.
  • 4.6K
  • 16 May 2023
Topic Review
Bombardier CRJ200
The Bombardier CRJ100 and CRJ200 (formerly known as the Canadair CRJ100 and CRJ200) are a family of regional airliners designed and manufactured by Bombardier. The CRJ had the distinction of marking Canada's entry into the civil jet industry. It was based on the Canadair Challenger business jet. An initial effort to produce an enlarged 36-seat version of the aircraft, known as the Challenger 610E, was terminated during 1981. Shortly after Canadair's privatisation and sale to Bombardier, work on a stretched derivative was reinvigorated; during early 1989, the Canadair Regional Jet program was formally launched. On 10 May 1991, the first of three CRJ100 prototypes conducted its maiden flight. The type first entered service during the following year with its launch customer, Germany airline Lufthansa. The initial variant, the CRJ100, was soon joined by another model, designated as the CRJ200. It was largely identical to the CRJ100, except for the installation of more efficient turbofan engines, which gave the aircraft lower fuel consumption, increased cruise altitude and cruise speed. During the 1990s, various additional versions and models of the type were developed and put into service. During the late 1990s, a substantially enlarged derivative of the airliner, referred to as the CRJ700, was developed; it was soon joined by the even larger CRJ900 and CRJ1000. During 2006, production of both the CRJ100 and CRJ200 came to an end; the majority of produced airliners have remained in revenue service to date. Additionally, several airlines have modernised their fleets to support extended service.
  • 4.6K
  • 27 Oct 2022
Topic Review
List of Oldest Surviving Ships
This is a list of the oldest ships in the world which have survived to this day without significantly losing their original form. It includes warships, yachts, tall ships, and vessels recovered during archaeological excavations. It does not include reconstructions or replicas, partially complete wreckage, or ships which have been located but remain underwater. For example, the Mary Rose, whose remains consist only of a partial hull, is not included here. Vessels listed are sorted by date of launching as most accurately known.
  • 4.6K
  • 07 Nov 2022
Topic Review
Parabolic Aluminized Reflector Light
A parabolic aluminized reflector lamp (also PARCAN light, PARcan, or simply PAR) is a type of electric lamp that is widely used in commercial, residential, and transportation illumination. Usage includes locomotive headlamps, aircraft landing lights, and residential and commercial recessed lights ("cans" in the United States). They are identical in principle to sealed beam automobile headlights. The lamps and their fixtures are widely used in theatre, concerts and motion picture production when a substantial amount of flat lighting is required for a scene. In situations where sunlight or other specular light is available, a white foam reflector is often used to accomplish the same effect as a PAR array. PAR cans are being replaced in some stage applications by LED PAR cans, which use less electric power and produce a wide array of saturated colors without the use of color filters, when white light is not needed.
  • 4.6K
  • 18 Oct 2022
Topic Review Peer Reviewed
William II of Hauteville (1171-1189)
William II of Hauteville King of Sicily (1171–1189). William II of Hauteville was the third king of the Norman dynasty on the throne of Sicily. He ruled independently from 1171 (from 1166 to 1171 he was under the regency of his mother) to 1189. From an iconographic point of view, he is particularly interesting because he was the first king of Sicily who made use of monumental images of himself. In particular, we have five official (namely, commissioned directly by him or his entourage) representations of him: the royal bull, the royal seal, and three images from the Cathedral of Monreale (near Palermo): two mosaic panels and one carved capital.
  • 4.6K
  • 18 Apr 2022
Topic Review
Symmetric Difference
In mathematics, the symmetric difference, also known as the disjunctive union, of two sets is the set of elements which are in either of the sets and not in their intersection. The symmetric difference of the sets A and B is commonly denoted by or or For example, the symmetric difference of the sets [math]\displaystyle{ \{1,2,3\} }[/math] and [math]\displaystyle{ \{3,4\} }[/math] is [math]\displaystyle{ \{1,2,4\} }[/math]. The power set of any set becomes an abelian group under the operation of symmetric difference, with the empty set as the neutral element of the group and every element in this group being its own inverse. The power set of any set becomes a Boolean ring with symmetric difference as the addition of the ring and intersection as the multiplication of the ring.
  • 4.6K
  • 17 Oct 2022
Topic Review Peer Reviewed
Unpacking Transdisciplinary Research Scenarios in Architecture and Urbanism
Research in architecture and urbanism is a complex undertaking. It involves a multitude of challenges, approaches, variables, diverse scales, and types of environments to examine. This entry dives into the complexities of architectural and urban research and explores the integration of diverse approaches into various research topics or domains. Recognizing the dynamic interplay of human, cultural, technological, and environmental factors in architecture and urbanism, it proposes a transdisciplinary approach to bridge existing disciplinary and methodological boundaries. This entry adopts and operationalizes a comprehensive approach that encompasses hybrid scenario development, integrated socio-spatial analysis, a revised experiential approach, and the integration of environmental psychology into architectural and urban studies. These components are envisioned to harmonize various methodologies and to depict a picture of what research in architecture and urbanism could be within an identified set of domains. This approach is grounded in a rigorous literature review, empirical evidence, and relevant validation through case studies. The application of this approach instigates a series of research scenarios which act as frameworks that provide new insights into design and practice-based research, building anatomy research, city dynamics research, housing dynamics research, and user perception studies. Each scenario demonstrates the applicability of combining theoretical insights with empirical investigations. The implications of these scenarios for architectural and urban research emphasize the significance of transdisciplinarity and highlights the importance of integrating diverse theoretical tenets and methodological insights to address the complex challenges of research in architecture and urbanism.
  • 4.6K
  • 20 Feb 2024
Topic Review
Tendencies Affecting Growth and Cultivation of Genus Spirulina
Spirulina, a kind of blue-green algae, is one of the Earth’s oldest known forms of life. Spirulina grows best in very alkaline environments, although it may flourish across a wide variety of pH values. There are several techniques for growing Spirulina spp., ranging from open systems such as ponds and lakes, which are vulnerable to contamination by animals and extraterrestrial species, to closed systems such as photovoltaic reactors, which are not. Most contaminated toxins come from other toxic algae species that become mixed up during harvest, necessitating the study of spirulina production processes at home. Lighting, temperature, inoculation volume, stirring speed, dissolved particles, pH, water quality, and overall micronutrient richness are only a few of the environmental parameters influencing spirulina production.
  • 4.6K
  • 08 Dec 2022
Topic Review
Pseudoephedrine
Pseudoephedrine (PSE) is a drug with a long history of medical use; it is helpful in treating symptoms of the common cold and flu, sinusitis, asthma, and bronchitis.
  • 4.6K
  • 29 Jun 2021
Topic Review
Silvicultural Site Preparation Techniques
Silvicultural site preparation techniques are planned anthropogenic disturbances that are designed to aid in the regeneration and establishment of a new stand of trees.
  • 4.6K
  • 09 Dec 2020
Topic Review
Active Aerodynamic Systems for Road Vehicles
Comfort, safety, high travel speeds, and low fuel consumption are expected characteristics of modern cars. Some of these are in conflict with one other. A solution to this conflict may be time-varying body geometry realized by moving aerodynamic elements and appropriate systems for controlling their motion. 
  • 4.6K
  • 08 Apr 2022
Topic Review
Honey in Treatment of COVID-19 Infection
The emergence of COVID-19, caused by the SARS-CoV-2 virus, led to the pursuit of solutions for the treatment of symptoms and/or disease. Honey has proven to be effective against viral infections, principally due to its potential antioxidant and anti-inflammatory activities that attenuate oxidative damage induced by pathogens, and by improving the immune system.
  • 4.6K
  • 22 Aug 2022
Topic Review
Green Tea
Green tea is a type of tea that is made from Camellia sinensis leaves that have not undergone the same withering and oxidation process used to make oolong teas and black teas. Green tea originated in China , but its production and manufacture has spread to many other countries in Asia. Several varieties of green tea exist, which differ substantially based on the variety of C. sinensis used, growing conditions, horticultural methods, production processing, and time of harvest. Although there has been considerable research on the possible health effects of consuming green tea regularly, there is little evidence that drinking green tea has any effects on health.
  • 4.6K
  • 08 Nov 2022
Topic Review
Yield (Engineering)
In materials science and engineering, the yield point is the point on a stress-strain curve that indicates the limit of elastic behavior and the beginning of plastic behavior. Below the yield point, a material will deform elastically and will return to its original shape when the applied stress is removed. Once the yield point is passed, some fraction of the deformation will be permanent and non-reversible and is known as plastic deformation. The yield strength or yield stress is a material property and is the stress corresponding to the yield point at which the material begins to deform plastically. The yield strength is often used to determine the maximum allowable load in a mechanical component, since it represents the upper limit to forces that can be applied without producing permanent deformation. In some materials, such as aluminium, there is a gradual onset of non-linear behavior, making the precise yield point difficult to determine. In such a case, the offset yield point (or proof stress) is taken as the stress at which 0.2% plastic deformation occurs. Yielding is a gradual failure mode which is normally not catastrophic, unlike ultimate failure. In solid mechanics, the yield point can be specified in terms of the three-dimensional principal stresses ([math]\displaystyle{ \sigma_1, \sigma_2 , \sigma_3 }[/math]) with a yield surface or a yield criterion. A variety of yield criteria have been developed for different materials.
  • 4.6K
  • 17 Oct 2022
Topic Review
Education of Midwives in Portugal and Spain
In Europe, midwives education, in accordance with the principles of the Bologna Declaration, are based on the pillars defined by Directive 2005/36/CE and by the Munich Declaration. In Portugal, the candidate applies on their own initiative to one of the Higher Education Institutions (HEIs) that provide such training. At the end of the education, students will achieve the master title. In Spain, the candidate sits for a state exam, which is announced annually by each autonomous community, for admission to the specialization.
  • 4.6K
  • 24 Jun 2022
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