Subject:
All Disciplines Arts & Humanities Biology & Life Sciences Business & Economics Chemistry & Materials Science Computer Science & Mathematics Engineering Environmental & Earth Sciences Medicine & Pharmacology Physical Sciences Public Health & Healthcare Social Sciences
Sort:
Hottest Latest Alphabetical (A-Z) Alphabetical (Z-A)
Type:
All Topic Review Biography
Topic Review
Katyusha Rocket Launcher
The Katyusha multiple rocket launcher (Russian: Катю́ша) is a type of rocket artillery first built and fielded by the Soviet Union in World War II. Multiple rocket launchers such as these deliver explosives to a target area more quickly than conventional artillery, but with lower accuracy and requiring a longer time to reload. They are fragile compared to artillery guns, but are inexpensive, easy to produce, and usable on any chassis. The Katyushas of World War II, the first self-propelled artillery mass-produced by the Soviet Union, were usually mounted on ordinary trucks. This mobility gave the Katyusha, and other self-propelled artillery, another advantage: being able to deliver a large blow all at once, and then move before being located and attacked with counter-battery fire. Katyusha weapons of World War II included the BM-13 launcher, light BM-8, and heavy BM-31. Today, the nickname is also applied to newer truck-mounted post-Soviet – in addition to non-Soviet – multiple rocket launchers, notably the common BM-21 Grad and its derivatives.
  • 15.5K
  • 07 Nov 2022
Topic Review
Asian Sexual Fetishism
Asian sexual fetishism, sometimes called an Asian fetish, is a variety of sexual fetishism involving primary attraction to persons of Asian descent, especially East or Southeast Asian descent and to some extent South Asian descent. Sexual fetishism towards East Asians by people of other ethnicities is sometimes described by the derogatory term yellow fever.
  • 15.4K
  • 20 Oct 2022
Topic Review
Solaris (Operating System)
Solaris is a proprietary Unix operating system originally developed by Sun Microsystems. It superseded the company's earlier SunOS in 1993. In 2010, after the Sun acquisition by Oracle, it was renamed Oracle Solaris. Solaris is known for its scalability, especially on SPARC systems, and for originating many innovative features such as DTrace, ZFS and Time Slider. Solaris supports SPARC and x86-64 workstations and servers from Oracle and other vendors. Solaris is registered as compliant with the Single UNIX Specification. Historically, Solaris was developed as proprietary software. In June 2005, Sun Microsystems released most of the codebase under the CDDL license, and founded the OpenSolaris open-source project. With OpenSolaris, Sun wanted to build a developer and user community around the software. After the acquisition of Sun Microsystems in January 2010, Oracle decided to discontinue the OpenSolaris distribution and the development model. In August 2010, Oracle discontinued providing public updates to the source code of the Solaris kernel, effectively turning Solaris 11 back into a closed source proprietary operating system. Following that, OpenSolaris was forked as illumos and is alive through several illumos distributions. In 2011, the Solaris 11 kernel source code leaked to BitTorrent. However, through the Oracle Technology Network (OTN), industry partners can still gain access to the in-development Solaris source code. Solaris is developed under a proprietary development model, and only the source for open-source components of Solaris 11 is available for download from Oracle.
  • 15.3K
  • 18 Oct 2022
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.
  • 15.3K
  • 04 Jan 2021
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.
  • 15.3K
  • 22 Jun 2021
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.
  • 15.1K
  • 12 Oct 2022
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.
  • 15.0K
  • 30 Nov 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.
  • 15.0K
  • 21 Jun 2024
Topic Review
Atheism in Hinduism
Atheism (Sanskrit: निरीश्वरवाद, nir-īśvara-vāda, lit. "statement of no Lord", "doctrine of godlessness") or disbelief in God or gods has been a historically propounded viewpoint in many of the orthodox and heterodox streams of Hindu philosophies. In Indian philosophy, three schools of thought are commonly referred to as nastika for rejecting the doctrine of Vedas: Jainism, Buddhism and Cārvāka. Hinduism is a religion, but also a philosophy. Among the various schools of Hindu philosophy, Samkhya, Yoga and Mimamsa while not rejecting either the Vedas or the Brahman, typically reject a personal God, creator God, or a God with attributes. While Samkhya and Yoga rejected the idea of an eternal, self-caused, creator God, Mimamsa argued that the Vedas could not have been authored by a deity. Though some schools of thought view the path of the atheist as difficult to follow in matters of spirituality, it is still a valid one. Hindu atheists accept Hinduism more as a "way of life" than a religion.
  • 15.0K
  • 20 Oct 2022
Topic Review
Hydrogen Storage and Transportation
In the current hydrocarbon economy, transportation is fueled primarily by petroleum. Burning of hydrocarbon fuels emits carbon dioxide and other pollutants. The supply of economically usable hydrocarbon resources in the world is limited, and the demand of hydrocarbon fuels is increasing, particularly in China, India and other countries. Proponents of a world-scale hydrogen economy argue that hydrogen can be environmentally cleaner source of energy to end-users, particularly in transportation applications, without release of pollutants (such as particulate matter) or carbon dioxide at the point of end use. A recent analysis asserted that “most of the hydrogen supply chain pathways would release significantly less carbon dioxide into the atmosphere than would gasoline used in hybrid electric vehicles” and that significant reductions in carbon dioxide emissions would be possible if carbon capture or carbon sequestration methods were utilized at the site od energy or hydrogen production. Hydrogen storage can be distributed continuously in pipelines or batch wise by ships, trucks, railway or airplanes. All batch transportation requires a storage system also pipelines can be used as pressure storage system. Hydrogen exhibits the highest heating value per weight of all chemical fuels. Furthermore, hydrogen is regenerative and environment friendly. But two difficulties with hydrogen are that hydrogen is just an energy carrier and has a low critical temperature of 35 K, i.e., hydrogen is a gas at room temperature. For mobile and in many cases also for stationary applications the volumetric and gravimetric density of hydrogen in a storage system is crucial. Hydrogen can be stored by six different methods and phenomena: high pressure gas cylinders (up to 800 bar), liquid hydrogen in cryogenic tanks (at 21 K), adsorbed hydrogen on materials with a large specific surface area (at T< 100K), absorbed on interstitial sites in a host metal (at ambient pressure and temperature), chemically bond in covalent and ionic compounds (at ambient pressure), oxidation of reactive metals e.g., Li, Na, Mg, Al, Zn with water. These metals easily react with water to the corresponding hydroxide and liberate the hydrogen from the water. Finally, the metal hydroxides can be thermally reduced to the metals in a solar furnace. In conclusion, routes for the transmission and storage of hydrogen for chemical processes, and hydrogen-based energy systems are increasing their establishment. Here, these routes are described, considering their attractions and difficulties.
  • 14.9K
  • 18 Jun 2021
  • Page
  • of
  • 5350
Featured Entry Collections
>>

Featured Books

>>
Encyclopedia of Social Sciences
Encyclopedia of COVID-19
Encyclopedia of Fungi
Encyclopedia of Digital Society, Industry 5.0 and Smart City
Video Production Service
Feedback