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Topic Review
Olefins Production via Steam Cracking:Effect of Operating Parameters
Various parameters need to be considered to optimize a pyrolysis reactor for the production of ethylene and propylene. These parameters are included temperature, residence time, steam-to-hydrocarbon ratio, and feedstock composition. A higher reaction temperature results in a higher yield of ethylene, a shorter residence time, and higher reaction velocities. A low operating pressure is preferred for this process because of the gas phase reaction inside the reactor tubes and the production of more gaseous molecules for its reactions to the right. The reactor pressure must be kept as low as possible (between 170 and 250 kPa). The gas pressure in the reactor tube outlet is indirectly adjusted by the suction process gas pressure of the compressor in the compression section, downstream of the process. As mentioned earlier, to reach lower hydrocarbon pressures, process steam is co-fed with the hydrocarbon feed to reduce the hydrocarbon partial pressure and lower coke deposition. The addition of steam decreases the partial pressure of the hydrocarbon feed and favors the formation of primary products.
  • 10.4K
  • 16 Dec 2021
Topic Review
Botulinum Neurotoxin Injection Targeting the Platysma Muscle
The platysma muscle is a thin superficial muscle that covers the entire neck and lower part of the face. The platysma muscle is the primary target muscle for botulinum neurotoxin injection therapy aimed at treating platysmal band and lower facial lifting. In the procedure of botulinum neurotoxin injection therapy, a lack of knowledge of the anatomy of the platysma muscle and the properties of botulinum neurotoxin can lead to side effects such as dysphagia, dysphonia, and weakness of the neck muscles. Anatomically safe injection sites have been proposed for the platysma muscle, and the appropriate injection technique has been reviewed.
  • 10.4K
  • 20 Dec 2022
Topic Review
Moral Disengagement
Moral disengagement is a term from social psychology for the process of convincing the self that ethical standards do not apply to oneself in a particular context. This is done by separating moral reactions from inhumane conduct and disabling the mechanism of self-condemnation. Thus, moral disengagement involves a process of cognitive re-construing or re-framing of destructive behavior as being morally acceptable without changing the behavior or the moral standards. In social cognitive theory of morality, self-regulatory mechanisms embedded in moral standards and self-sanctions translate moral reasoning into actions, and, as a result, moral agency is exerted. Thus, the moral self is situated in a broader, socio-cognitive self-theory consisting of self-organizing, proactive, self-reflective, and self-regulative mechanisms. Three major sub-functions are operating in this self-regulatory system in which moral agency is grounded. The first sub-function is self-monitoring of one's conduct, which is the initial step of taking control over it. "Action gives rise to self-reactions through a judgmental function in which conduct is evaluated against internal standards and situational circumstances". Thus, moral judgments evoke self-reactive influence. The self-reactive and judgmental mechanisms constitute the second and third sub-function. Generally, moral standards are adopted to serve as guides for good behavior and as deterrents for bad conduct. Once internalized control has developed, people regulate their actions by the standards they apply to themselves and this give them self-satisfaction and a sense of self-worth. Individuals refrain from behaving in ways that violate their moral standards in order to avoid self-condemnation. Therefore, self-sanctions play a significant role in keeping conduct in line with these internal moral standards and hence also in regulating inhumane conduct. However, moral standards only function as fixed internal regulators of conduct when self-regulatory mechanisms have been activated. Many different social and psychological processes prevent the activation of self-sanction. Selective activation of self-sanctions and internal moral control or disengagement allows for a wide range of behaviour, given the same moral standard. Moral disengagement functions in the perpetration of inhumanities through moral justification, euphemistic labelling, advantageous comparison, displacing or diffusing responsibility, disregarding or misrepresenting injurious consequences, and dehumanising the victim. Rather than operating independently, these cognitive mechanisms are interrelated within a sociostructural context to promote inhumane conduct in people's daily lives.
  • 10.4K
  • 10 Oct 2022
Topic Review
Travis (Chimpanzee)
Travis (October 21, 1995 – February 16, 2009) was a male common chimpanzee (Pan troglodytes) who, in February 2009, mauled his owner's friend in Stamford, Connecticut. He blinded her, severed several body parts and lacerated her face. He was shot dead by a police officer. As an animal actor, Travis had appeared in several television shows and commercials, including spots for Pepsi and Old Navy. He had also appeared on The Maury Povich Show, The Man Show, and a television pilot that featured Sheryl Crow and Michael Moore.
  • 10.4K
  • 07 Nov 2022
Topic Review
Social Structure
Social structure refers to the patterned arrangements of social relationships, institutions, and norms that shape and guide human behavior within a society. It encompasses both formal institutions, such as government and education, and informal norms, roles, and values that govern social interactions. Social structure provides a framework for understanding the organization and functioning of societies, influencing individuals' opportunities, behaviors, and relationships within social contexts.
  • 10.4K
  • 02 Feb 2024
Topic Review
Natural Herbals and Spices in Wound Healing
Herbal medicines have been employed in folk medicine to accelerate wound healing since ancient times. Many plants and various preparations thereof have been used traditionally in relation to wound treatment, especially due to their immense potential to affect wound healing. Plant-based extracts and/or isolates support tissue regeneration through a variety of mechanisms, which often work together to improve the whole healing process. Currently, the efficacy of many of these herbs is well documented together with their mechanisms of action. Therefore, natural products as well as their pure compounds are an emerging source of alternative medicinal compounds for the management of various diseases, among which is wound healing.
  • 10.4K
  • 29 Jun 2022
Topic Review
Battery Specifications
Batteries are the heart and the bottleneck of portable electronic systems. They power electronics and determine the system run time, with the size and volume determining factors in their design and implementation. Understanding the material properties of the battery components—anode, cathode, electrolyte, and separator—and their interaction is necessary to establish selection criteria based on their correlations with the battery metrics: capacity, current density, and cycle life. 
  • 10.4K
  • 07 Sep 2022
Topic Review
Year
A year is the orbital period of a planetary body, for example, the Earth, moving in its orbit around the Sun. Due to the Earth's axial tilt, the course of a year sees the passing of the seasons, marked by change in weather, the hours of daylight, and, consequently, vegetation and soil fertility. In temperate and subpolar regions around the planet, four seasons are generally recognized: spring, summer, autumn and winter. In tropical and subtropical regions, several geographical sectors do not present defined seasons; but in the seasonal tropics, the annual wet and dry seasons are recognized and tracked. A calendar year is an approximation of the number of days of the Earth's orbital period, as counted in a given calendar. The Gregorian calendar, or modern calendar, presents its calendar year to be either a common year of 365 days or a leap year of 366 days, as do the Julian calendars; see below. For the Gregorian calendar, the average length of the calendar year (the mean year) across the complete leap cycle of 400 years is 365.2425 days. The ISO standard ISO 80000-3, Annex C, supports the symbol a (for Latin annus) to represent a year of either 365 or 366 days. In English, the abbreviations y and yr are commonly used. In astronomy, the Julian year is a unit of time; it is defined as 365.25 days of exactly 86,400 seconds (SI base unit), totalling exactly 31,557,600 seconds in the Julian astronomical year. The word year is also used for periods loosely associated with, but not identical to, the calendar or astronomical year, such as the seasonal year, the fiscal year, the academic year, etc. Similarly, year can mean the orbital period of any planet; for example, a Martian year and a Venusian year are examples of the time a planet takes to transit one complete orbit. The term can also be used in reference to any long period or cycle, such as the Great Year.
  • 10.4K
  • 14 Oct 2022
Topic Review
Intergalactic Space
Outer space, or simply space, is the expanse that exists beyond the Earth and between celestial bodies. Outer space is not completely empty—it is a hard vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium, as well as electromagnetic radiation, magnetic fields, neutrinos, dust, and cosmic rays. The baseline temperature of outer space, as set by the background radiation from the Big Bang, is 2.7 kelvins (−270.45 °C; −454.81 °F). The plasma between galaxies accounts for about half of the baryonic (ordinary) matter in the universe; it has a number density of less than one hydrogen atom per cubic metre and a temperature of millions of kelvins. Local concentrations of matter have condensed into stars and galaxies. Studies indicate that 90% of the mass in most galaxies is in an unknown form, called dark matter, which interacts with other matter through gravitational but not electromagnetic forces. Observations suggest that the majority of the mass-energy in the observable universe is dark energy, a type of vacuum energy that is poorly understood. Intergalactic space takes up most of the volume of the universe, but even galaxies and star systems consist almost entirely of empty space. Outer space does not begin at a definite altitude above the Earth's surface. However, the Kármán line, an altitude of 100 km (62 mi) above sea level, is conventionally used as the start of outer space in space treaties and for aerospace records keeping. The framework for international space law was established by the Outer Space Treaty, which entered into force on 10 October 1967. This treaty precludes any claims of national sovereignty and permits all states to freely explore outer space. Despite the drafting of UN resolutions for the peaceful uses of outer space, anti-satellite weapons have been tested in Earth orbit. Humans began the physical exploration of space during the 20th century with the advent of high-altitude balloon flights. This was followed by manned rocket flights and, then, manned Earth orbit, first achieved by Yuri Gagarin of the Soviet Union in 1961. Due to the high cost of getting into space, manned spaceflight has been limited to low Earth orbit and the Moon. On the other hand, unmanned spacecraft have reached all of the known planets in the Solar System. Outer space represents a challenging environment for human exploration because of the hazards of vacuum and radiation. Microgravity also has a negative effect on human physiology that causes both muscle atrophy and bone loss. In addition to these health and environmental issues, the economic cost of putting objects, including humans, into space is very high.
  • 10.4K
  • 23 Nov 2022
Topic Review
Topical Antifungal-Corticosteroid Combinations
A broad range of topical antifungal formulations containing miconazole or terbinafine as actives are commonly used as efficacious choices for combating fungal skin infections. Their many benefits, owing to their specific mechanism of action, include their ability to target the site of infection, enhance treatment efficacy and reduce the risk of systemic side effects. Their proven efficacy, and positioning in the treatment of fungal skin infections, is enhanced by high patient compliance, especially when appropriate vehicles such as creams, ointments and gels are used.
  • 10.4K
  • 18 Aug 2022
Topic Review
Commodity Fetishism
Commodity fetishism is a concept introduced by Karl Marx in his critique of political economy, particularly in his seminal work "Capital, Volume I." The term is used to describe a phenomenon where the social relationships among people are obscured and displaced by the relationships between commodities and the value they represent in a capitalist society. In a capitalist system, commodities are goods or services produced for exchange in the market. Marx argued that the social relations involved in the production and exchange of commodities become mystified, and the commodities themselves take on a quasi-magical quality. This fetishism arises when people attribute inherent value or power to commodities, seeing them as possessing qualities independent of the social relations that produced them.
  • 10.4K
  • 25 Jan 2024
Topic Review
List of International Mathematical Olympiad Participants
The International Mathematical Olympiad (IMO) is an annual international high school mathematics competition focused primarily on pre-collegiate mathematics, and is the oldest of the international science olympiads. The awards for exceptional performance include medals for roughly the top half participants, and honorable mentions for participants who solve at least one problem perfectly. This is a list of participants who have achieved notability. This includes participants that went on to become notable mathematicians, participants who won medals at an exceptionally young age, or participants who scored highly.
  • 10.3K
  • 26 Oct 2022
Topic Review
Mangalore
Mangalore (/mæŋɡəˈlɔːr/), officially known as Mangaluru, is a major port city of the Indian state of Karnataka. It is located between the Arabian Sea and the Western Ghats about 352 km (219 mi) west of Bangalore, the state capital, 20 km north of Karnataka–Kerala border, 297 km south of Goa. Mangalore is the state's only city to have all four modes of transport—air, road, rail and sea. The population of the urban agglomeration was 619,664 (As of 2011) national census of India. It is known for being one of the locations of the Indian strategic petroleum reserves. The city developed as a port in the Arabian Sea during ancient times; it has since developed into a major port of India that handles 75 per cent of India's coffee and cashew exports, and is the country's seventh largest container port. Mangalore has been ruled by several major powers, including the Kadambas, Alupas, Vijayanagar Empire, Keladi Nayaks and the Portuguese. The city was a source of contention between the British and the Kingdom of Mysore rulers Hyder Ali and Tipu Sultan, and was eventually annexed by the British in 1799. Mangalore remained part of the Madras Presidency until India's independence in 1947 and was unified with Mysore State (now called Karnataka) in 1956. Mangalore is also the administrative headquarters of the Dakshina Kannada district, and is a commercial, industrial, educational, healthcare and startup hub. This city's International Airport is the second-largest and second-busiest airport in Karnataka. Mangalore City Corporation is responsible for the civic administration, which manages the 60 wards of the city. The city's landscape is characterised by rolling hills, coconut palms, rivers and hard laterite soil. India's first 3D planetarium with 8K resolution display is situated in this city. Mangalore is also included in the Smart Cities Mission list and is among the 100 smart cities to be developed in India. The city has an average elevation of 22 m (72 ft) above mean sea level. Mangalore has a tropical monsoon climate and is under the influence of the southwest monsoon. (As of 2017), Mangalore was ranked the 48th best city to live in the world by a US survey, and the only Indian city in the top 50.
  • 10.3K
  • 17 Oct 2022
Topic Review
Ecological Urban Planning and Design
Urbanization is a defining feature of the modern age, yet the current model of urban development profoundly alters the natural environment, often reducing biodiversity and ultimately threatening human wellbeing. An ecologically based urban planning and design paradigm should consider a more harmonious relationship. Through a systematic literature review of 57 papers, this research identified relevant concepts and theories that could underpin this new paradigm. It revealed a noticeable increase in academic interest in this subject since 2013 and the development of concepts and theories that reflect a more holistic socio-ecological systems approach to urban planning and design based on a transdisciplinary integration and synthesis of research. Seven main themes underpin the academic literature: ecosystem services, socio-ecological systems, resilience, biodiversity, landscape, green infrastructure, as well as integrated and holistic approaches. Six of these can be organised into either a sustainability stream or a spatial stream, representing the foundations of a potential new ecological urban planning and design paradigm that applies sustainability-related concepts in a spatial setting. The final theme, integrated and holistic, includes concepts that reflect the fundamental characteristics of this new paradigm, which can be termed ‘urban consonance’
  • 10.3K
  • 29 Oct 2020
Topic Review
Dyschronometria
Dyschronometria is a condition of cerebellar dysfunction in which an individual cannot accurately estimate the amount of time that has passed (i.e., distorted time perception). It is associated with cerebellar ataxia, when the cerebellum has been damaged and does not function to its fullest ability. Lesions to the cerebellum can cause dyssynergia, dysmetria, dysdiadochokinesia, dysarthria, and ataxia of stance and gait. Dyschronometria can result from autosomal dominant cerebellar ataxia (ADCA).
  • 10.3K
  • 04 Nov 2022
Topic Review
The Black Madonna
The Black Madonna, with origins in Africa, is a prominent example of how African beliefs have been integrated into other faiths in ways that are often obscured from view. The Black Madonna is compared with the characteristics and symbolism of the traditional fair-skinned Virgin Mary. It is estimated that there are hundreds of depictions of the Black Madonna, yet her identity as truly black is generally minimized. This review contributes a theoretical rationale for the lack of recognition and acceptance of the Madonna as black, contextualizing this within a feminist theoretical viewpoint and analyzing the connection to African folklore and traditional religious beliefs. The theoretical framework articulated in this paper contributes an elucidation of the ways that indigenous African religions have affected other world religions. Acknowledging this influence challenges the simplistic notion of reified distinctions between Western and non-Western religions.
  • 10.3K
  • 01 Jul 2021
Topic Review
Electrical Resistance/Conductivity of CFRP
This entry provides a comprehensive basis for readers to grasp recent research progresses on electrical behaviors of Carbon fiber reinforced polymer (CFRP), which plays an important role in many fields, especially in aviation and civil industries. The electrical conductivity of CFRP is critical for its electrical behaviors, such as its lightning strike vulnerability, electromagnetic shielding ability, and potential uses for self-sensing. In addition, the electrical conductivity is related to the mechanical integrity. Therefore, electrical properties can be measured as an indication in the detection of delamination and other defects in CFRP. 
  • 10.3K
  • 01 Nov 2020
Topic Review
Curcumin's Structure and Biological Properties
Curcumin, a natural polyphenolic compound derived from the South Asian turmeric plant (Curcuma longa), has well-characterized antioxidant, anti-inflammatory, anti-protein-aggregate, and anticancer properties.
  • 10.3K
  • 06 Nov 2020
Biography
Sabrina Gonzalez Pasterski
Sabrina Gonzalez Pasterski (born June 3, 1993) is an American theoretical physicist from Chicago who studies high energy physics.[1] She describes herself as "a proud first-generation Cuban-American & Chicago Public Schools alumna."[2] She completed her undergraduate studies at the Massachusetts Institute of Technology (MIT), earned her PhD from Harvard University and is a rising PCTS Postdoctor
  • 10.3K
  • 12 Dec 2022
Topic Review
Organic Potatoes and Conventional Potatoes
Interest in organic foods is increasing at a moment when humanity is facing a range of health challenges including the concern that some conventionally produced foods may pose possible adverse effects on human and livestock health. Consumers are showing increasing interest in organically grown potatoes due to their nutritional quality and health protection value.
  • 10.3K
  • 28 Sep 2021
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