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Topic Review
Photovoltaic Cell Generations
Solar energy is one of the most demanding renewable sources of electricity. Electricity production using photovoltaic technology not only helps meet the growing demand for energy, but also contributes to mitigating global climate change by reducing dependence on fossil fuels. The level of competitiveness of innovative next-generation solar cells is increasing due to the efforts of researchers and scientists related to the development of new materials, particularly nanomaterials and nanotechnology.
  • 18.5K
  • 25 Aug 2022
Topic Review
System Architecture for Autonomous Vehicles
Technology facilitates humans, improves productivity and leads to a better quality of life. Technological developments and automation in vehicular networks will lead to better road safety and lower congestion in present urban areas where the traditional transport system is becoming increasingly disorganised and inefficient. Therefore, the development of the intelligent transport systems (ITS) concept has been proposed, with the aim and focus on improving traffic safety and providing different services to its users. There has been considerable research in ITS resulting in significant contributions . 
  • 18.3K
  • 07 Apr 2021
Topic Review
EEG Power Spectrum
The electrical activity of the brain reflected in the electroencephalogram (EEG) is determined by neurons, glia cells, and the blood-brain barrier, which is mainly caused by nerve cells.
  • 18.3K
  • 30 Oct 2020
Topic Review
Hook-Up Culture
Hook-up culture refers to a culture built on the approved practice of engaging in hook-ups, or sexual encounters between two or more individuals where it is understood that commitment, relationships, and emotional feelings are not expected outcomes. Defining a hook-up is ambiguous because it can have a variety of meanings ranging from casual Kissing to foreplay and oral sex, or in some cases, it can mean participating in sexual intercourse. Hook-ups typically only last a short time and those involved are typically only interested in experiencing sexual intimacy and pleasure. Not all hook-ups can be classified as "one-night stands", however, since some people believe they can eventually lead to dating or more personal connections. While people have engaged in casual sex for many years, the act of "hooking-up" has become increasingly popular on college and university campuses in the United States over the last decade. Hooking up has become common for many college students, and the practice has replaced more traditional 20th century ideas about dating. Furthermore, social media sites like Facebook or Match, and phone applications like Grindr and Tinder have given users an opportunity to form connections with other people who have similar sexual interests or desires. Studying hook-up culture focuses on its influences on the formation and management of friendships and romantic relationships. The growth of hook-up culture is also shaping gender roles, specifically in regards to sexual behavior. Aside from these aspects of hook-ups, taking part in uncommitted sex can lead to potential negative physical and emotional impacts.
  • 18.3K
  • 02 Nov 2022
Topic Review
Eeny, Meeny, Miny, Moe
"Eeny, meeny, miny, moe" — which can be spelled a number of ways — is a children's counting rhyme, used to select a person in games such as tag. It is one of a large group of similar rhymes in which the child who is pointed to by the chanter on the last syllable is either "chosen" or "counted out". The rhyme has existed in various forms since well before 1820, and is common in many languages with similar-sounding nonsense syllables. Since many similar counting rhymes existed earlier, it is difficult to ascertain this rhyme's exact original.
  • 18.3K
  • 12 Oct 2022
Topic Review
Gender Differences in Work-Life Balance/Career Opportunities/Health
Although gender roles no longer clearly define who is responsible for home care and who is responsible for job duties, some research shows that the conflict between family and work life appears to be a greater problem for women than for men. For women, the relationships between career opportunities and work–life balance and between career opportunities and the perception of general health have significantly lower values compared to results from the group of men, while the perception of work–life balance affects well-being more significantly when compared to the male counterpart.
  • 18.2K
  • 21 Jun 2024
Topic Review
High Voltage Direct Current (HVDC) Technology
Two main high voltage direct current (HVDC) technologies: line-commutated converters (LCC), also known as current-source converters (CSC) using thyristors, and voltage-source converters (VSC)-HVDC, using IGBT transistors, both are suitable for a wide range of applications.
  • 17.9K
  • 07 Mar 2022
Topic Review
Mongol Conquest of Khwarezmia
The Mongol conquest of Khwarezmia (Persian: حمله مغول به خوارزم‎), or the Mongol invasion of Iran (Persia) (Persian: حمله مغول به ایران‎), from 1219 to 1221 marked the beginning of the Mongol conquest of the Islamic states. The Mongol expansion would ultimately culminate in the conquest of virtually all of Asia as well as parts of Eastern Europe, with the exception of Japan , the Mamluk Sultanate of Egypt, Siberia, and most of the Indian subcontinent and Southeast Asia. According to the Persian historian Minhaj-i-Siraj, Genghis Khan sent the ruler of the Khwarazmian Empire, Muhammad II, a message seeking trade and greeted him as his neighbor: "I am master of the lands of the rising sun while you rule those of the setting sun. Let us conclude a firm treaty of friendship and peace", or he said "I am Khan of the lands of the rising sun while you are sultan of those of the setting sun: Let us conclude a firm agreement of friendship and peace." The Mongols' original unification of all "people in felt tents", unifying the nomadic tribes in Mongolia and then the Turkomans and other nomadic peoples, had come with relatively little bloodshed, and almost no material loss. The Mongol wars with the Jurchens was known to Muhammad II and he agreed to this peace treaty. War between the Mongols and the Khwarazmian Empire started less than a year later, when a Mongol caravan and its envoys were massacred in the Khwarazmian city of Otrar. In the ensuing war, lasting less than two years, the Khwarazmian dynasty was destroyed and the Khwarazmian Empire was conquered.
  • 17.8K
  • 16 Nov 2022
Topic Review
Oceania
Oceania (UK: /ˌoʊsiˈɑːniə, ˌoʊʃi-, -ˈeɪn-/, US: /ˌoʊʃiˈæniə/ (listen), /-ˈɑːn-/) is a geographical region that includes Australasia, Melanesia, Micronesia, and Polynesia. Spanning the Eastern and Western hemispheres, Oceania is estimated to have a land area of 8,525,989 square kilometres (3,291,903 sq mi)[discuss] and a population of over 41 million. When compared with the other continents, the region of Oceania is the smallest in land area and the second smallest in population after Antarctica. Its six major population centres are Sydney, Melbourne, Brisbane, Perth, Auckland, and Adelaide. Oceania has a diverse mix of economies from the highly developed and globally competitive financial markets of Australia , French Polynesia, Hawaiʻi, New Caledonia, and New Zealand, which rank high in quality of life and Human Development Index, to the much less developed economies of Kiribati, Papua New Guinea, Tuvalu, Vanuatu, and Western New Guinea, while also including medium-sized economies of Pacific islands such as Fiji, Palau, and Tonga. The largest and most populous country in Oceania is Australia, and the largest city is Sydney. Puncak Jaya in Papua is the highest peak in Oceania at 4,884 m (16,024 ft). The first settlers of Australia, New Guinea, and the large islands just to the east arrived more than 60,000 years ago. Oceania was first explored by Europeans from the 16th century onward. Portuguese explorers, between 1512 and 1526, reached the Tanimbar Islands, some of the Caroline Islands and west Papua New Guinea. On his first voyage in the 18th century, James Cook, who later arrived at the highly developed Hawaiʻian Islands, went to Tahiti and followed the east coast of Australia for the first time. The arrival of European settlers in subsequent centuries resulted in a significant alteration in the social and political landscape of Oceania. The Pacific theatre saw major action during the Second World War, mainly between Allied powers the United States, Philippines (a US Commonwealth at the time) and Australia, and Axis power Japan. The rock art of Aboriginal Australians is the longest continuously practiced artistic tradition in the world. Most Oceanian countries are multi-party representative parliamentary democracies, with tourism being a large source of income for the Pacific Islands nations.
  • 17.6K
  • 03 Mar 2023
Topic Review
Thermoelectric Generators: Progress and Applications
A thermoelectric effect is a physical phenomenon consisting of the direct conversion of heat into electrical energy (Seebeck effect) or inversely from electrical current into heat (Peltier effect) without moving mechanical parts. In this review, state-of-the-art thermoelectric generators, applications and recent progress are reported.
  • 17.6K
  • 27 Aug 2020
Topic Review
Sociology and History
Sociology and History as consolidated scientific and academic projects have maintained a peculiar and paradoxical relationship. The growing disciplinary and subdisciplinary specialisation of these two sciences poses relevant epistemological and methodological challenges in order to face potential situations of isolation, fragmentation and enable the apology of an interdisciplinary perspective characterised by the historicity of social structures, actions and senses.
  • 17.6K
  • 30 Oct 2020
Topic Review
Left-Libertarianism
Left-libertarianism (or left-wing libertarianism) names several related, but distinct approaches to political and social theory which stress both individual freedom and social equality. In its classical usage, left-libertarianism is a synonym for anti-authoritarian varieties of left-wing politics, e.g. libertarian socialism, which includes anarchism and libertarian Marxism among others. Left-libertarianism can also refer to political positions associated with academic philosophers Hillel Steiner, Philippe Van Parijs and Peter Vallentyne that combine self-ownership with an egalitarian approach to natural resources. While maintaining full respect for personal property, left-libertarians are skeptical of or fully against private ownership of natural resources, arguing that neither claiming nor mixing one's labor with natural resources is enough to generate full private property rights and maintain that natural resources (raw land, oil, gold, the electromagnetic spectrum, air-space, etc.) should be held in an egalitarian manner, either unowned or owned collectively. Those left-libertarians who support private property do so under the condition that recompense is offered to the local or even global community. On the other hand, left-wing market anarchism, which includes Pierre-Joseph Proudhon's mutualism and Samuel Edward Konkin III's agorism, appeals to left-wing concerns such as egalitarianism, gender and sexuality, class, immigration and environmentalism within the paradigm of a socialist free market. In the United States, the word "libertarian" has become associated with right-libertarianism after Murray Rothbard and Karl Hess reached out to the New Left in the 1960s. However, until then political usage of the word was associated exclusively with anti-capitalism and in most parts of the world such an association still predominates.
  • 17.6K
  • 24 Nov 2022
Topic Review
History of Measurement
The earliest recorded systems of weights and measures originate in the 3rd or 4th millennium BC. Even the very earliest civilizations needed measurement for purposes of agriculture, construction, and trade. Early standard units might only have applied to a single community or small region, with every area developing its own standards for lengths, areas, volumes and masses. Often such systems were closely tied to one field of use, so that volume measures used, for example, for dry grains were unrelated to those for liquids, with neither bearing any particular relationship to units of length used for measuring cloth or land. With development of manufacturing technologies, and the growing importance of trade between communities and ultimately across the Earth, standardized weights and measures became critical. Starting in the 18th century, modernized, simplified and uniform systems of weights and measures were developed, with the fundamental units defined by ever more precise methods in the science of metrology. The discovery and application of electricity was one factor motivating the development of standardized internationally applicable units.
  • 17.5K
  • 03 Nov 2022
Topic Review
Buddhism and Evolution
Evolution is not explicitly mentioned in the Tipitaka. As no major principles of Buddhism contradict it, many Buddhists tacitly accept the theory of evolution. Questions about the eternity or infinity of the universe at large are counted among the 14 unanswerable questions which the Buddha maintained were counterproductive areas of speculation. As such, many Buddhists do not think about these kinds of questions as meaningful for the Buddhist goal of relieving oneself and others from suffering. One does not need to know the origin of life in order to achieve enlightenment. Dalai Lama dismisses the element of randomness in the theory of evolution based on natural selection: Lopez elaborates that the process of Rebirth (into any of a large number of states of being including the human, any kind of animal and several types of supernatural being) is conditioned by karma (action of consciousness), which explains Dalai Lama's view. Buddhists believe the beginning of this world and of life is inconceivable since they have neither beginning nor end. Buddhists believe that the world was not created once upon a time, but that the world has been created millions of times every second and will continue to do so by itself and will break away by itself.
  • 17.4K
  • 05 Nov 2022
Topic Review
Ivan Illich
Ivan Illich (1926-2002) was a very well-known author, mainly in the 1970s, for his provocative publications, such as Deschooling Society (1970), where he proposed the eradication of the School as an institution.
  • 17.4K
  • 29 Oct 2020
Topic Review
Nutritional Composition in Tomatoes
Tomatoes are consumed worldwide as fresh vegetables because of their high contents of essential nutrients and antioxidant-rich phytochemicals. Tomatoes contain minerals, vitamins, proteins, essential amino acids (leucine, threonine, valine, histidine, lysine, arginine), monounsaturated fatty acids (linoleic and linolenic acids), carotenoids (lycopene and β-carotenoids) and phytoster-ols (β-sitosterol, campesterol and stigmasterol). Lycopene is the main dietary carotenoid in tomato and tomato-based food products and lycopene consumption by humans has been reported to protect against cancer, cardiovascular diseases, cognitive function and osteoporosis. Among the phenolic compounds present in tomato, quercetin, kaempferol, naringenin, caffeic acid and lutein are the most common. Many of these compounds have antioxidant activities and are effective in protecting the human body against various oxidative stress-related diseases. Dietary tomatoes in-crease the body’s level of antioxidants, trapping reactive oxygen species and reducing oxidative damage to important biomolecules such as membrane lipids, enzymatic proteins and DNA, thereby ameliorating oxidative stress.
  • 17.3K
  • 04 Jan 2021
Topic Review
Black Cumin and Kidney Injury
The prevalence of chronic kidney disease (CKD) is increasing worldwide, and a close association between acute kidney injury (AKI) and CKD has recently been identified. Black cumin (Nigella sativa) has been shown to be effective in treating various kidney diseases. Accumulating evidence shows that black cumin and its vital compound, thymoquinone (TQ), can protect against kidney injury caused by various xenobiotics, namely chemotherapeutic agents, heavy metals, pesticides, and other environmental chemicals. Black cumin can also protect the kidneys from ischemic shock. The mechanisms underlying the kidney protective potential of black cumin and TQ include antioxidation, anti-inflammation, anti-apoptosis, and antifibrosis which are manifested in their regulatory role in the antioxidant defense system, NF-κB signaling, caspase pathways, and TGF-β signaling. 
  • 17.3K
  • 01 Sep 2021
Topic Review
Gotra
In Hindu society, the term gotra (Sanskrit: गोत्र) is commonly considered to be equivalent to clan. It broadly refers to people who are descendants in an unbroken male line from a common male ancestor or patriline. Generally the gotra forms an exogamous unit, with the marriage within the same gotra being prohibited by custom, being regarded as incest. The name of the gotra can be used as a surname, but it is different from a surname and is strictly maintained because of its importance in marriages among Hindus, especially among the higher castes. Pāṇini defines gotra for grammatical purposes as apatyam pautraprabhrti gotram (IV. 1. 162), which means "the word gotra denotes the progeny (of a sage) beginning with the son's son." When a person says "I am Vipparla-gotra", he means that he traces his descent from the ancient sage Vipparla by unbroken male descent. According to the Brihadaranyaka Upanisad 2.2.6, Gautama and Bharadvāja, Viśvāmitra and Jamadagni, Vashishtha and Kaśhyapa and Shandilya are seven sages (also known as saptarishi); the progeny of these seven sages are declared to be gotras. This enumeration of seven primary gotras seems to have been known to Pāṇini. The offspring (apatya) of these seven are gotras and others than these are called gotrâvayava. One who follows the system defined by three sages defines himself as tri-a-rishaye. Similarly, for five sages, it is pancha-rishaye, and for seven sages, it is sapta-rishaye. There exists another theory about gotra: sons and disciples of a sage would have the same gotra; it is believed that they possess similar thought and philosophy. People of the same gotra can be found across different castes. Each Gotra comprises pravaras.
  • 17.3K
  • 30 Nov 2022
Topic Review
Project-Based Learning
Life skills are defined as “abilities for adaptive and supportive behaviors that enable individuals to deal effectively with the demands and challenges of everyday life”. These skills can help individuals in leading a meaningful life. Hence, it is of importance to consider the role schools play in equipping students with these life skills. Schools bear the responsibility of choosing the right strategies to develop these skills. One of these strategies is project-based. Project-based learning (PBL) is a teaching strategy that offers students the chance to develop real life skills. This occurs through engaging students in the cycle of PBL that requires the use of a variety of skills from the students to solve problems.
  • 17.3K
  • 22 Jun 2021
Topic Review
Yield
In chemistry, yield, also referred to as reaction yield, is a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage. Yield is one of the primary factors that scientists must consider in organic and inorganic chemical synthesis processes. In chemical reaction engineering, "yield", "conversion" and "selectivity" are terms used to describe ratios of how much of a reactant was consumed (conversion), how much desired product was formed (yield) in relation to the undesired product (selectivity), represented as X, Y, and S.
  • 17.1K
  • 18 Oct 2022
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