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Topic Review
Manila Galleon
The Manila Galleons (Spanish: Galeón de Manila; Filipino: Galyon ng Maynila) were Spain trading ships which for two-and-a-half centuries linked the Spanish Captaincy General of the Philippines with Mexico across the Pacific Ocean, making one or two round-trip voyages per year between the ports of Acapulco and Manila, which were both part of New Spain. The name of the galleon changed to reflect the city that the ship sailed from. The term Manila galleon can also refer to the trade route itself between Acapulco and Manila, which lasted from 1565 to 1815. The Manila galleons sailed the Pacific for 250 years, bringing to the Americas cargoes of luxury goods such as spices and porcelain in exchange for New World silver. The route also fostered cultural exchanges that shaped the identities and culture of the countries involved. The Manila galleons were also (somewhat confusingly) known in New Spain as La Nao de la China ("The China Ship") on their voyages from the Philippines because they carried mostly Chinese goods, shipped from Manila. The Spanish inaugurated the Manila galleon trade route in 1565 after the Augustinian friar and navigator Andrés de Urdaneta pioneered the tornaviaje or return route from the Philippines to Mexico. Urdaneta and Alonso de Arellano made the first successful round trips that year. The trade using "Urdaneta's route" lasted until 1815, when the Mexican War of Independence broke out. In 2015 the Philippines and Mexico began preparations for the nomination of the Manila-Acapulco Galleon Trade Route in the UNESCO World Heritage List, with backing from Spain. Spain has also suggested the tri-national nomination of the Archives on the Manila-Acapulco Galleons in the UNESCO Memory of the World Register.
  • 12.7K
  • 18 Oct 2022
Topic Review
Benzodiazepines
The Benzodiazepines (BDZs) are a group of components that receive their name because in their chemical structure have a benzene ring joined to other seven-members heterocyclic ring called Diazepine.
  • 12.6K
  • 13 Apr 2021
Topic Review
Henderson–Hasselbalch Equation
In chemistry, the Henderson–Hasselbalch equation describes the derivation of pH as a measure of acidity (using pKa, the negative log of the acid dissociation constant) in biological and chemical systems. The equation is also useful for estimating the pH of a buffer solution and finding the equilibrium pH in acid-base reactions (it is widely used to calculate the isoelectric point of proteins). The equation is given by: Here, [HA] is the molar concentration of the undissociated weak acid, [A⁻] is the molar concentration (molarity, M) of this acid's conjugate base and pKa is −log10 Ka where Ka is the acid dissociation constant, that is: In these equations, A⁻ denotes the ionic form of the relevant acid. Bracketed quantities such as [base] and [acid] denote the molar concentration of the quantity enclosed.
  • 12.6K
  • 14 Oct 2022
Topic Review
Chemical Bonding of H2O
Water (H2O) is a simple triatomic bent molecule with C2v molecular symmetry and bond angle of 104.5° between the central oxygen atom and the hydrogen atoms. Despite being one of the simplest triatomic molecules, its chemical bonding scheme is nonetheless complex as many of its bonding properties such as bond angle, ionization energy, and electronic state energy cannot be explained by one unified bonding model. Instead, several traditional and advanced bonding models such as simple Lewis and VESPR structure, valence bond theory, molecular orbital theory, isovalent hybridization, and Bent's rule are discussed below to provide a comprehensive bonding model for H2O, explaining and rationalizing the various electronic and physical properties and features manifested by its peculiar bonding arrangements.
  • 12.6K
  • 18 Oct 2022
Topic Review
Polio Virus
Poliovirus is a member of a family of viruses called the Picornaviridae.
  • 12.6K
  • 16 Sep 2022
Topic Review
Intergeneric Hybrid
In biology, a hybrid is the offspring resulting from combining the qualities of two organisms of different breeds, varieties, species or genera through sexual reproduction. Hybrids are not always intermediates between their parents (such as in blending inheritance), but can show hybrid vigor, sometimes growing larger or taller than either parent. The concept of a hybrid is interpreted differently in animal and plant breeding, where there is interest in the individual parentage. In genetics, attention is focused on the numbers of chromosomes. In taxonomy, a key question is how closely related the parent species are. Species are reproductively isolated by strong barriers to hybridisation, which include genetic and morphological differences, differing times of fertility, mating behaviors and cues, and physiological rejection of sperm cells or the developing embryo. Some act before fertilization and others after it. Similar barriers exist in plants, with differences in flowering times, pollen vectors, inhibition of pollen tube growth, somatoplastic sterility, cytoplasmic-genic male sterility and the structure of the chromosomes. A few animal species and many plant species, however, are the result of hybrid speciation, including important crop plants such as wheat, where the number of chromosomes has been doubled. Human impact on the environment has resulted in an increase in the interbreeding between regional species, and the proliferation of introduced species worldwide has also resulted in an increase in hybridisation. This genetic mixing may threaten many species with extinction, while genetic erosion from monoculture in crop plants may be damaging the gene pools of many species for future breeding. A form of often intentional human-mediated hybridisation is the crossing of wild and domesticated species. This is common in both traditional horticulture and modern agriculture; many commercially useful fruits, flowers, garden herbs, and trees have been produced by hybridisation. One such flower, Oenothera lamarckiana, was central to early genetics research into mutationism and polyploidy. It is also more occasionally done in the livestock and pet trades; some well-known wild × domestic hybrids are beefalo and wolfdogs. Human selective breeding of domesticated animals and plants has resulted in the development of distinct breeds (usually called cultivars in reference to plants); crossbreeds between them (without any wild stock) are sometimes also imprecisely referred to as "hybrids". Hybrid humans existed in prehistory. For example, Neanderthals and anatomically modern humans are thought to have interbred as recently as 40,000 years ago. Mythological hybrids appear in human culture in forms as diverse as the Minotaur, blends of animals, humans and mythical beasts such as centaurs and sphinxes, and the Nephilim of the Biblical apocrypha described as the wicked sons of fallen angels and attractive women.
  • 12.6K
  • 10 Oct 2022
Topic Review
Impacts of Brick Making on Environment
The brick making industry, despite its contribution to environmental pollution, plays a major role in the economic growth of many nations, with the traditional technology accounting for a significant proportion of the total clay brick production. This writeup gives an overview of the origin of brickmaking, its socioeconomic importance, the environmental impacts and improvements made in the art of brickmaking over the years. The environmental impacts from brickmaking cannot be overruled, however, this impacts could be minimized and managed  through the adoption of more sustainable and environmentally friendly firing innovative.
  • 12.6K
  • 23 Nov 2021
Topic Review
Design Concepts for Floating Offshore Wind Turbines
Offshore wind energy is a sustainable renewable energy source that is acquired by harnessing the force of the wind offshore, where the absence of obstructions allows the wind to travel at higher and more steady speeds. Offshore wind has recently grown in popularity because wind energy is more powerful offshore than on land. 
  • 12.6K
  • 10 Jan 2023
Topic Review
Sati (Buddhism)
Sati (from Pali: सति; Sanskrit: स्मृति smṛti) is mindfulness or awareness, a spiritual or psychological faculty (indriya) that forms an essential part of Buddhist practice. It is the first factor of the Seven Factors of Enlightenment. "Correct" or "right" mindfulness (Pali: sammā-sati, Sanskrit samyak-smṛti) is the seventh element of the Noble Eightfold Path.
  • 12.6K
  • 25 Oct 2022
Topic Review
DPSIR Model
       The Driving force – Pressure – Status – Impact - Response (DPSIR) framework has been widely used in literature to analyse environmental problems. The DPSIR facilitates the investigation of all the possible cause-effect relationships and to plan appropriate technological responses.  This contribution shows an application of the DPSIR to the remediation of contaminated sites, exploiting the case study of the Mar Piccolo di Taranto (Southern Italy). Methodologically, several references were considered, whose information was classified according to the logical scheme of the DPSIR. Among the results it is interesting to observe how, due to its natural hydrogeological network conformation, the Mar Piccolo represents the final receptor of pollutants from industrial, anthropic and agricultural activities. The mobility of contaminants from sediments to the water column and the subsequent bioaccumulation into marine organisms pose a serious threat of unacceptable magnitude to human safety. Responses may concern restriction of area use, control of pollution fonts as well as the implementation of suitable contaminated marine sediment remediation measures. It is noted that the preliminary organization of the existing data can lead to the development of a DPSIR-based Environmental Decision Support System (EDSS). 
  • 12.6K
  • 30 Oct 2020
Topic Review
Tyrannosaurus
Tyrannosaurus is a genus of large theropod dinosaur. The species Tyrannosaurus rex (rex meaning "king" in Latin), often called T. rex or colloquially T-Rex, is one of the best represented theropods. Tyrannosaurus lived throughout what is now western North America, on what was then an island continent known as Laramidia. Tyrannosaurus had a much wider range than other tyrannosaurids. Fossils are found in a variety of rock formations dating to the Maastrichtian age of the Upper Cretaceous period, 68 to 66 million years ago. It was the last known member of the tyrannosaurids and among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event. Like other tyrannosaurids, Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. Relative to its large and powerful hind limbs, the forelimbs of Tyrannosaurus were short but unusually powerful for their size, and they had two clawed digits. The most complete specimen measures up to 12.3–12.4 m (40.4–40.7 ft) in length; however, according to most modern estimates, T. rex could grow to lengths of over 12.4 m (40.7 ft), up to 3.66–3.96 m (12–13 ft) tall at the hips, and 8.87 metric tons (9.78 short tons) in body mass. Although other theropods rivaled or exceeded Tyrannosaurus rex in size, it is still among the largest known land predators and is estimated to have exerted the strongest bite force among all terrestrial animals. By far the largest carnivore in its environment, Tyrannosaurus rex was most likely an apex predator, preying upon hadrosaurs, juvenile armored herbivores like ceratopsians and ankylosaurs, and possibly sauropods. Some experts have suggested the dinosaur was primarily a scavenger. The question of whether Tyrannosaurus was an apex predator or a pure scavenger was among the longest debates in paleontology. Most paleontologists today accept that Tyrannosaurus was both an active predator and a scavenger. Specimens of Tyrannosaurus rex include some that are nearly complete skeletons. Soft tissue and proteins have been reported in at least one of these specimens. The abundance of fossil material has allowed significant research into many aspects of its biology, including its life history and biomechanics. The feeding habits, physiology, and potential speed of Tyrannosaurus rex are a few subjects of debate. Its taxonomy is also controversial, as some scientists consider Tarbosaurus bataar from Asia to be a second Tyrannosaurus species, while others maintain Tarbosaurus is a separate genus. Several other genera of North American tyrannosaurids have also been synonymized with Tyrannosaurus. As the archetypal theropod, Tyrannosaurus has been one of the best-known dinosaurs since the early 20th century and has been featured in film, advertising, postal stamps, and many other media.
  • 12.6K
  • 06 Dec 2022
Topic Review
Mooning
Mooning is the act of displaying one's bare buttocks by removing clothing, e.g., by lowering the backside of one's trousers and underpants, usually bending over, whether also exposing the genitals or not. Mooning is used in the English-speaking world to express protest, scorn, disrespect, or provocation, or can be done for shock value, fun, or as a form of exhibitionism. Some jurisdictions regard mooning to be indecent exposure, sometimes depending on the context.
  • 12.6K
  • 27 Oct 2022
Topic Review
Pearlescent Pigments
Pigments are substances used to modify the colour of a material, which, unlike dyes, are insoluble both in common solvents and binders. Pigments can be either organic or inorganic, though the latest type is the most used and widespread for industry applications.
  • 12.6K
  • 01 Nov 2020
Topic Review
Kraft Pulp Mill Process
Kraft pulp mills produce a fibrous material composed of wood cellulose fibers, constituting the main raw material for papermaking. The kraft process is the dominant technology in the world to produce pulp, allowing the recycling of most of the pulping chemical in two loops, commonly referred to as the sodium cycle and calcium cycle. A third cycle is also relevant to sodium sulphate recovery. Meanwhile, significant amounts of solid, liquid and gaseous emissions are generated, requiring treatment before release into the environment. Some inorganic solid wastes are of particular concern due to the high quantities generated, which are landfilled: green liquor dregs, slaker grits, lime mud, and boiler fly ash.
  • 12.6K
  • 29 Oct 2020
Topic Review
Greenhouse Drying System
Drying via solar energy is an environmentally friendly and inexpensive process. For controlled and bulk level drying, a greenhouse solar dryer is the most suitable controlled level solar dryer. The efficiency of a solar greenhouse dryer can be increased by using thermal storage. The agricultural products dried in greenhouses are reported to be of a higher quality than those dried in the sun because they are shielded from dust, rain, insects, birds, and animals. The heat storage-based greenhouse was found to be superior for drying of all types of crops in comparison to a normal greenhouse dryer, as it provides constant heat throughout the drying process.
  • 12.6K
  • 30 Jan 2023
Topic Review
Positive Impact Organizations
Positive Impact Organizations broaden their purposes and their value creation to embrace strong sustainability, thereby contributing to economic, social, and environmental value. "Positive impact" is defined by products and services that are created with the purpose of solving societal problems. It reflects the shift from reducing an organization’s negative footprint to achieving a significant net positive impact on society and the planet. 
  • 12.6K
  • 30 Aug 2021
Topic Review
Sierpinski Triangle
The Sierpinski triangle (also with the original orthography Sierpiński), also called the Sierpinski gasket or the Sierpinski Sieve, is a fractal and attractive fixed set with the overall shape of an equilateral triangle, subdivided recursively into smaller equilateral triangles. Originally constructed as a curve, this is one of the basic examples of self-similar sets, i.e., it is a mathematically generated pattern that is reproducible at any magnification or reduction. It is named after the Poland mathematician Wacław Sierpiński, but appeared as a decorative pattern many centuries before the work of Sierpiński.
  • 12.5K
  • 04 Nov 2022
Topic Review
Triply Periodic Minimal Surfaces Thermal Hydraulic Effects
Triply Periodic Minimal Surfaces (TPMS) are a kind of periodic implicit surface with zero mean curvature, that is, the surfaces that locally minimize surface area for a given boundary. The TPMS is composed of infinite, non-self-intersecting, periodic surfaces in three principal directions. The TPMS networks as repeated lattice structures have attracted much research interest because they have shown better mechanical performance, mass transfer, and thermal conductivity than conventional and strut-based structures, which have been employed in different disciplines. With excellent performances in the TPMS architectures, current works have investigated the TPMS structures to utilize in a wide range of applications.
  • 12.5K
  • 29 Dec 2022
Topic Review
Human Well-Being
The definition of human well-being is diverse and is often used interchangeably with happiness, human welfare, standard of living or quality of life and has become an all-around term to measure and promote human lifestyle.
  • 12.5K
  • 25 Feb 2021
Topic Review
Second Language Acquisition
Second language acquisition, or SLA, is the process by which people learn languages in addition to their native tongue(s). The term second language is used to describe any language whose acquisition starts after early childhood (including what may be the third or subsequent language learned). The language to be learned is often referred to as the "target language" or "L2"; SLA is sometimes called L2A, for "L2 acquisition". The term "language acquisition" became commonly used after Stephen Krashen contrasted it with formal and non-constructive "learning." Today, most scholars use "language learning" and "language acquisition" interchangeably, unless they are directly addressing Krashen's work. However, "second language acquisition" or "SLA" has become established as the preferred term for this academic discipline. The study of SLA is usually viewed as part of applied linguistics.
  • 12.5K
  • 04 Nov 2022
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