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Topic Review
Roadable Aircraft
A roadable aircraft is a type of flying car. It is a hybrid vehicle that combines the flying capability of an aircraft with the option of being driven as an automobile on the ground. The roadable aircraft is typically recognized as a small plane with retractable wings that can fly in the open sky and to drive along roads. Most roadable aircraft have either integrated or modular components. In the U.S., the Defense Advanced Research Projects Agency (DARPA) has shown an interest in the concept with a $65 million program called Transformer to develop a four-person roadable aircraft by 2015. The vehicle is required to take off vertically, and have a 280-mile (450 km) range. AAI Corporation and Lockheed Martin were awarded contracts in late 2010 for the Phase 1 program. Lockheed Martin's design was selected to continue to Phase 3.
  • 3.9K
  • 10 Oct 2022
Topic Review Video Peer Reviewed
Role of Happiness when Evaluating Society
Happiness, or life satisfaction, has become an important factor when considering what should be the objective of a society. Understanding the nature of happiness is thus important. The text offers a biological—specifically evolutionary—framework, which suggests that happiness can be described as the net impact of positive and negative feelings. It follows that a key issue is to explain what these feelings are about. The present situation and options for improving the score of happiness are discussed.
  • 3.9K
  • 13 Apr 2022
Topic Review
The Modulation Recognition Method Based on Deep Learning
Deep learning is a powerful artificial intelligence technology that can learn features from a large amount of data and fit nonlinear networks, so it is widely used in the fields of computer vision, natural language processing, and speech recognition, and has achieved tremendous success. Since mobile communication networks are able to generate large amounts of different types of data at a very fast pace, relevant researchers have applied deep learning to the field of communication, bringing opportunities for the development of communication technologies. For example, signal modulation identification in wireless communication can be done using deep learning techniques, and deep learning-based modulation identification methods have better robustness than traditional AMR methods and higher accuracy rates. There are many excellent neural networks in deep learning, such as convolutional neural network (CNN), recurrent neural network (RNN), etc. Among them, CNN is good at processing image data and RNN is good at processing sequence signals. CNN and RNN are widely used in AMR. The application of these neural networks to deep learning is discussed.
  • 3.9K
  • 08 Oct 2022
Topic Review
Mobile Phone Overuse
Mobile phone overuse (smartphone addiction, mobile-phone addiction, problem mobile phone use, or mobile phone dependency) is a dependence syndrome seen among mobile phone users. Some mobile phone users exhibit problematic behaviors related to substance use disorders. These behaviors can include preoccupation with mobile communication, excessive money or time spent on mobile phones, use of mobile phones in socially or physically inappropriate situations such as driving an automobile. Increased use can also lead to increased time on mobile communication, adverse effects on relationships, and anxiety if separated from a mobile phone or sufficient signal.
  • 3.9K
  • 14 Nov 2022
Topic Review
Reduced Affect Display
Reduced affect display, sometimes referred to as emotional blunting, is a condition of reduced emotional reactivity in an individual. It manifests as a failure to express feelings (affect display) either verbally or nonverbally, especially when talking about issues that would normally be expected to engage the emotions. Expressive gestures are rare and there is little animation in facial expression or vocal inflection. Reduced affect can be symptomatic of autism, schizophrenia, depression, posttraumatic stress disorder, depersonalization disorder, schizoid personality disorder or brain damage. It may also be a side effect of certain medications (e.g., antipsychotics and antidepressants). Reduced affect should be distinguished from apathy and anhedonia, which explicitly refer to a lack of emotion, whereas reduced affect is a lack of emotional expression (affect display) regardless of whether emotion (underlying affect) is actually reduced or not.
  • 3.9K
  • 17 Nov 2022
Topic Review Peer Reviewed
From Bioinspiration to Biomimicry in Architecture: Opportunities and Challenges
The term “bioinspiration” defines a creative approach based on the observation of biological principles and transfer to design. Biomimicry is the recent approach, which describes a large field of scientific and technical activities dealing with an interdisciplinary cooperation between biology and other fields with the goal of solving practical problems addressing innovation or sustainable development. Architecture has been influenced by many aspects of natural and social sciences, among these, biology is currently blending into design activities. Bioinspiration has evolved and shifted architectural practices towards numerous innovative approaches through different bioarchitectural movements from the past until the present. However, there is a blur of biomimicry within bioinspiration in architecture between the direct copy of mere natural forms and the true understanding of biological principles, which is the pivot of sustainable development. The main challenge remains in the gap between the profound knowledge of biology, its related scientific fields and the creative process of architectural design, including cross-disciplinary collaboration between architects and biologists. This entry presents main bioarchitectural movements and how it leads to today’s biomimicry. It proposes to define biomimicry methodologies and how this approach applies to architectural design contexts through the study of existing case studies. The opportunities, challenges and the future outlook of the field will also be discussed.
  • 3.9K
  • 03 Mar 2023
Topic Review
Post-Materialism
In sociology, post-materialism is the transformation of individual values from materialist, physical, and economic to new individual values of autonomy and self-expression. The term was popularised by political scientist Ronald Inglehart in his 1977 book The Silent Revolution, in which he discovered that the formative affluence experienced by the post-war generations was leading some of them to take their material security for granted and instead place greater importance on non-material goals such as self-expression, autonomy, freedom of speech, gender equality and environmentalism. Inglehart argued that with increasing prosperity, such post-material values would gradually increase in the publics of advanced industrial societies through the process of intergenerational replacement. Post-materialism is a tool in developing an understanding of modern culture. It can be considered in reference of three distinct concepts of materialism. The first kind of materialism, and the one in reference to which the word post-materialism is used most often, refers to materialism as a value-system relating to the desire for fulfillment of material needs (such as security, sustenance and shelter) and an emphasis on material luxuries in a consumerist society. A second referent is the materialist conception of history held by many socialists, most notably Marx and Engels, as well as their philosophic concept of dialectical materialism. The third definition of materialism concerns the philosophical argument that matter is the only existing reality. The first concept is sociological, the second is both philosophical and sociological, and the third is philosophical. Depending on which of the three above notions of materialism are being discussed, post-materialism can be an ontological postmaterialism, an existentialistic postmaterialism, an ethical postmaterialism, or a political-sociological postmaterialism, which is also the best known.
  • 3.9K
  • 04 Nov 2022
Topic Review
Smart Logistics in Industry 5.0
Given the importance of human centricity, resilience, and sustainability, the emerging concept of Industry 5.0 has pushed forward the research frontier of the technology-focused Industry 4.0 to a smart and harmonious socio-economic transition driven by both humans and technologies, where the role of the human in the technological transformation is predominantly focused on. The core elements of Industry 5.0 show that following the technology-centric transition of Industry 4.0, the societal, environmental, and human perspectives require more attention, which will yield significant impacts on logistics operations and management. For instance, the personalization of demands implies a personalized delivery system. Incorporating customers into the design requires highly intelligent CPS and system integration. Human–machine interaction triggers the interaction of various topics such as safety, human behavior, etc. Thus, there exist various challenges and approaches to addressing smart logistics issues in Industry 5.0. 
  • 3.9K
  • 21 Apr 2022
Topic Review
ZnO Photocatalysts for the Treatment of Wastewater
The presence of contaminants in wastewater, surface water, groundwater, and drinking water is a serious threat to human and environmental health. Their toxic effects and resistance towards conventional water treatment methods have compelled the scientific community to search for an environmentally friendly method that could efficiently degrade toxic contaminants. In this regard, visible light active photocatalysts have proved to be efficient in eliminating a wide variety of water toxins. A plethora of research activities have been carried out and significant amounts of funds are spent on the monitoring and removal of water contaminants, but relatively little attention has been paid to the degradation of persistent water pollutants. In this regard, nanoparticles of doped ZnO are preferred options owing to their low recombination rate and excellent photocatalytic and antimicrobial activity under irradiation of solar light. 
  • 3.9K
  • 18 Feb 2022
Topic Review
Semaphore Line
A semaphore telegraph is a system of conveying information by means of visual signals, using towers with pivoting shutters, also known as blades or paddles. Information is encoded by the position of the mechanical elements; it is read when the shutter is in a fixed position. The most widely used system was invented in 1792 in France by Claude Chappe, and was popular in the late eighteenth to early nineteenth centuries. Lines of relay towers with a semaphore rig at the top were built within line-of-sight of each other, at separations of 5 to 20 miles. Operators at each tower would watch the neighboring tower through a spyglass, and when the semaphore arms began to move spelling out a message. They would pass the message on to the next tower. This system was much faster than post riders for conveying a message over long distances, and also had cheaper long-term operating costs, once constructed. Semaphore lines were a precursor of the electrical telegraph, which would replace them half a century later, and would also be cheaper, faster, and more private. The line-of-sight distance between relay stations was limited by geography and weather, and prevented the optical telegraph from crossing wide expanses of water, unless a convenient island could be used for a relay station. Modern derivatives of the semaphore system include flag semaphore (a flag relay system) and the heliograph (optical telegraphy using mirror-directed sunlight reflections).
  • 3.9K
  • 20 Oct 2022
Topic Review
Non-Covalent Interactions
A non-covalent interaction differs from a covalent bond in that it does not involve the sharing of electrons, but rather involves more dispersed variations of electromagnetic interactions between molecules or within a molecule. The chemical energy released in the formation of non-covalent interactions is typically on the order of 1-5 kcal/mol (1000–5000 calories per 6.02 x 10^23 molecules). Non-covalent interactions can be classified into different categories, such as electrostatic, π-effects, van der Waals forces, and hydrophobic effects. Non-covalent interactions are critical in maintaining the three-dimensional structure of large molecules, such as proteins and nucleic acids. In addition, they are also involved in many biological processes in which large molecules bind specifically but transiently to one another (see the properties section of the DNA page). These interactions also heavily influence drug design, crystallinity and design of materials, particularly for self-assembly, and, in general, the synthesis of many organic molecules. Intermolecular forces are non-covalent interactions that occur between different molecules, rather than between different atoms of the same molecule.
  • 3.9K
  • 16 Nov 2022
Topic Review
Power Posing
Power posing is a controversial self-improvement technique or "life hack" in which people stand in a posture that they mentally associate with being powerful, in the hope of feeling and behaving more assertively. Though the underlying science is strongly disputed, its promoters continue to argue that people can foster positive life changes simply by assuming a "powerful" or "expansive" posture for a few minutes before an interaction in which confidence is needed. One popular image of the technique in practice is that of candidates "lock[ing] themselves in bathroom stalls before job interviews to make victory V's with their arms." Power posing was first suggested in a 2010 paper by Dana R. Carney, Amy Cuddy, and Andy Yap in the journal Psychological Science, and came to prominence through a popular TED talk by Cuddy in 2012. However, in 2015 several researchers began reporting that the effect could not be replicated, and, in 2016, Carney issued a statement abandoning the theory. Cuddy, however, continued her research, claiming to have evidence that posture feedback can at least make people feel more powerful. Today, power posing is often cited as an example of the replication crisis in the sciences.
  • 3.9K
  • 01 Dec 2022
Topic Review
Furfuryl Alcohol
Furfuryl alcohol (FuOH, C4H3OCH2OH, 2-furylmethanol, 2-furancarbinol) has applications in the fabrication of foundry resins, the ingredient production of P-series fuels, in liquid alkanes and in food production. It is also a very important intermediate in fine chemical synthesis and the polymer industry, and it is used as a chemical intermediate for the synthesis of lysine, vitamin C and levulinic acid and employed as a lubricant and as a dispersing agent.
  • 3.9K
  • 10 Oct 2020
Topic Review
Ti/Al/X/Au Au-Contained Ohmic Contact Technique
AlGaN/GaN high electron mobility transistors (HEMTs) are regarded as promising candidates for a 5G communication system, which demands higher frequency and power. Source/drain ohmic contact is one of the key fabrication processes crucial to the device performance. Firstly, Aucontained metal stacks combined with RTA high-temperature ohmic contact schemes were presented and analyzed, including process conditions and contact formation mechanisms. Considering the issues with the Au-contained technique, the overview of a sequence of Au-free schemes is given and comprehensively discussed. In addition, in order to solve various problems caused by hightemperature conditions, novel annealing techniques including microwave annealing (MWA) and laser annealing (LA) were proposed to form Au-free low-temperature ohmic contact to AlGaN/GaN HEMT. The most popular metallization schemes of ohmic contact in AlGaN/GaN HEMT is Ti/Al/X/Au, where X can be Ni, Mo, Pt, Ta, Ir, etc.
  • 3.9K
  • 28 Jun 2022
Topic Review
Pointing-Out Instruction
The pointing-out instruction (ngo sprod) is the direct introduction to the nature of mind in the Tibetan Buddhist lineages of Mahāmudrā and Dzogchen. In these traditions, a "root guru" gives the "pointing-out instruction" in such a way that the disciple successfully recognizes the nature of mind. The tradition of conferring such instructions outside the context of formal empowerment (Sanskrit: abhiṣeka) is unique to the Kagyu and Nyingma lineages. Whether or not such instructions are valid without the formal empowerment has historically been a point of contention with the more conservative Gelug and Sakya lineages. The pointing-out instruction is often equated with the fourth formal vajrayana empowerment.
  • 3.9K
  • 29 Nov 2022
Topic Review
Rhinitis: Classification, Types, Pathophysiology
Rhinitis describes a pattern of symptoms as a result of nasal inflammation and/or dysfunction of the nasal mucosa. It is an umbrella entity that includes many different subtypes, several of which escape of complete characterization. Rhinitis is considered as a pathologic condition with considerable morbidity and financial burden on health care systems worldwide. Its economic impact is further emphasized by the fact that it represents a risk factor for other conditions such as sinusitis, asthma, learning disabilities, behavioral changes, and psychological impairment. Rhinitis may be associated with many etiologic triggers such as infections, immediate-type allergic responses, inhaled irritants, medications, hormonal disturbances, and neural system dysfunction. 
  • 3.9K
  • 01 Aug 2021
Topic Review
1994 Scotland RAF Chinook Crash
On 2 June 1994, a Chinook helicopter of the Royal Air Force (RAF), serial number ZD576, crashed on the Mull of Kintyre, Scotland, in foggy conditions. The crash resulted in the deaths of all twenty-five passengers and four crew on board. Among the passengers were almost all the United Kingdom's senior Northern Ireland intelligence experts. The accident is the RAF's worst peacetime disaster. In 1995, an RAF board of inquiry ruled that it was impossible to establish the exact cause of the accident. This ruling was subsequently overturned by two senior reviewing officers, who stated the pilots were guilty of gross negligence for flying too fast and too low in thick fog. This finding proved to be controversial, especially in light of irregularities and technical issues surrounding the then-new Chinook HC.2 variant which were uncovered. A Parliamentary inquiry conducted in 2001 found the previous verdict of gross negligence on the part of the crew to be 'unjustified'. In 2011, an independent review of the crash cleared the crew of negligence.
  • 3.9K
  • 14 Nov 2022
Topic Review
Jackson Family
The Jackson family is an important and influential American family of singers that has garnered prominence in the music industry, originated from Gary, Indiana. Performing as members of The Jackson 5 and as solo artists, the children of Joseph Walter and Katherine Esther Jackson were very successful in the field of popular music from the late 1960s onwards. As a group, the eldest sons Jackie, Tito, Jermaine, Marlon, Michael, and later with the inclusion of Randy. The members who managed to be solo icons in music are Michael Jackson and Janet Jackson. The Jackson 5 became known as the "First Family of Soul" (a title first held by the Five Stairsteps). The continued success of Michael and Janet's careers as solo artists led the Jacksons to become known as the "Royal Family of Pop". All nine of the Jackson siblings have gold records to their credits with La Toya holding the distinction of being the first Jackson sister to attain one (awarded by France's SNEP for "Reggae Night", a song she co-wrote for Jimmy Cliff), and now to Janet Jackson for being the first black woman to receive the Billboard Icon Award. The Jackson family has been the subject of controversy linked to the Jordan Chandler Case. But the most controversial facts of Jackson's private life are accusations made by his sons against family patriarch Joseph Jackson claiming that he was harassed by his father as a child. Despite these circumstances and other problems, the Jacksons continued to be one of the most influential families in the United States and in recent years some family members have been honored for their work; in 1997 The Jackson 5 was inducted to the Rock and Roll Hall of Fame. Michael would follow the group to the hall in 2001. The Jacksons, Michael and Janet all received stars on the Hollywood Walk of Fame in 1980, 1984 and 1990 respectively. Joseph was recognized as "the best musical businessman of all time" by the city of Cleveland in 2002. In 2009 a new series from A&E entitled The Jacksons: A Family Dynasty premiered documenting the Jackson brothers dealing with the sudden loss of Michael and preparing for a Jackson 5 Reunion tour. The most popular member of the Jackson family was Michael Jackson, known as the King of Pop and died in June 2009, due to a cardiac arrest.
  • 3.9K
  • 01 Dec 2022
Topic Review
Saṅkhāra
Saṅkhāra (Pali; सङ्खार; Sanskrit: संस्कार or saṃskāra) is a term figuring prominently in Buddhism. The word means 'formations' or 'that which has been put together' and 'that which puts together'. In the first (passive) sense, saṅkhāra refers to conditioned phenomena generally but specifically to all mental "dispositions". These are called 'volitional formations' both because they are formed as a result of volition and because they are causes for the arising of future volitional actions. English translations for saṅkhāra in the first sense of the word include 'conditioned things,' 'determinations,' 'fabrications' and 'formations' (or, particularly when referring to mental processes, 'volitional formations'). In the second (active) sense of the word, saṅkhāra refers to karma (sankhara-khandha) that leads to conditioned arising, dependent origination. According to the Vijnanavada school, there are 51 samskaras or mental factors.
  • 3.9K
  • 09 Nov 2022
Topic Review
Polyisoprene Rubber
Rubber materials have been used in a wide range of applications, from automotive parts to special-design engineering pieces, as well as in the pharmaceutical, food, electronics, and military industries, among others. Since the discovery of the vulcanization of natural rubber (NR) in 1838, the continuous demand for this material has intensified the quest for a synthetic substitute with similar properties.
  • 3.9K
  • 25 Oct 2023
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