До того, как процесс избранного портала прекратился в 2017 году, он был обозначен как избранный портал.
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Научный портал

Эффект Мейснера p1390048.jpg

Магнит парит над сверхпроводником

Наука (от латинского слова scientia , что означает «знание») - это систематическое предприятие, которое создает и систематизирует знания в форме проверяемых объяснений и предсказаний о Вселенной .

Самые ранние корни науки можно проследить в Древнем Египте и Месопотамии примерно в 3500–3000 годах до нашей эры. Их вклад в математику , астрономию и медицины вошли и в форме греческой натурфилософии в классической древности , в результате чего было сделаны формальные попытки дать объяснение событий в физическом мире на основе естественных причин. После падения Западной Римской империи знания греческих концепций мира ухудшились в Западной Европе в первые века (с 400 по 1000 год н.э.) Средневековья., но сохранилась в мусульманском мире во время Золотого века ислама . Восстановление и ассимиляция греческих работ и исламских исследований в Западной Европе с 10 по 13 век возродили « естественную философию », которая позже была преобразована научной революцией , начавшейся в 16 веке, когда новые идеи и открытия отклонились от предыдущих греческих концепций и традиции. Научный метод вскоре сыграл большую роль в создании знаний и он не был до 19 - го века , что многие институциональные и профессиональныеначали складываться особенности науки; вместе с заменой «натурфилософии» на «естествознание».

Современная наука обычно делится на три основные отрасли, которые состоят из естественных наук (например, биологии , химии и физики ), изучающих природу в самом широком смысле; в социальных науках (например, экономика , психология и социология ), что изучение отдельных лиц и общества; и формальные науки (например, логика , математика и теоретическая информатика), которые изучают абстрактные понятия. Однако существуют разногласия относительно того, действительно ли формальные науки представляют собой науку, поскольку они не полагаются на эмпирические данные . Дисциплины, использующие существующие научные знания для практических целей, такие как инженерия и медицина, называются прикладными науками .

Наука основана на исследованиях , которые обычно проводятся учеными, работающими в академических и исследовательских учреждениях , государственных учреждениях и компаниях . Практическое влияние научных исследований привело к появлению научных политик, которые стремятся повлиять на научное предприятие, отдавая приоритет развитию коммерческой продукции , вооружений , здравоохранения , общественной инфраструктуры и защиты окружающей среды . ( Полная статья ... )

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  • Ураган-лейн - мощный тропический циклон , принесший проливные дожди и сильные ветры на Гавайи в конце августа 2018 года. Шторм был самым влажным за всю историю наблюдений на Гавайях, с пиковыми осадками
    58 дюймов (1473 мм) вдоль восточных склонов Мауна-Лоа . Лейн был двенадцатым названным штормом , шестым ураганом, четвертым крупным ураганом и первым из трех ураганов категории 5 рекордного сезона тихоокеанских ураганов 2018 года . Циклона возник из зоны низкого давления , которые образуются такжеюгозападе Мексики13 августа. Следуя на запад через область благоприятных атмосферных и океанических условий, система в последующие дни неуклонно усиливалась. Он достиг первоначального пика как ураган категории 4 18 августа. Временно сдерживаемый более враждебными условиями, ураган немного ослаб, прежде чем набрать силу и достичь статуса категории 5 22 августа к югу от Гавайев. Пик переулка был при скорости ветра 160 миль в час (260 км / ч) и атмосферном давлении 926  мбар ( гПа ; 27,34  дюйма ртутного столба).). После этого ураган повернул на север и замедлился. В этот период проливные дожди обрушились на большую часть Гавайских островов. Неблагоприятные условия снова повлияли на ураган, который к 28 августа перерос в тропическую депрессию, а на следующий день рассеялся.

    Лейн побудил к выпуску часов и предупреждений об ураганах для каждого острова на Гавайях. С 22 по 26 августа Лейн принес сильный дождь на большую часть Гавайских Наветренных островов , что вызвало внезапные наводнения и оползни. Последствия были наиболее значительными в Хило и его окрестностях, где было затоплено несколько кварталов. По другую сторону Большого острова были повреждены или разрушены 159 построек. Сильный ветер повалил деревья и линии электропередач на Мауи, и на островах Мауи и Оаху вспыхнули кустарные пожары . Один несчастный случай произошел на Кауаи . Оползни и наводнения повредили дороги по всему штату; Ремонт завершен в апреле 2019 года. Общий экономический ущерб от урагана превысил 250 миллионов долларов. В сентябре президент Дональд Трамп объявил большую часть Гавайев зоной бедствия ; Федеральное агентство по чрезвычайным ситуациям , в конечном счете предоставил около $ 10 млн в помощь. ( Полная статья ... )

  • Hurricane Fred was the easternmost Atlantic hurricane to form in the tropics, and the first to move through Cape Verde since 1892. The second hurricane and sixth named storm of the 2015 Atlantic hurricane season, Fred originated from a well-defined tropical wave over West Africa in late August 2015. Once offshore, the wave moved northwestward within a favorable tropospheric environment and strengthened into a tropical storm on August 30. The following day, Fred grew to a Category 1 hurricane with peak winds of 85 mph (140 km/h) as it approached Cape Verde. After passing Boa Vista and moving away from Santo Antão, it entered a phase of steady weakening, dropping below hurricane status by September 1. Fred then turned to the west-northwest, enduring increasingly hostile wind shear, but maintained its status as a tropical cyclone despite repeated forecasts of imminent dissipation. It fluctuated between minimal tropical storm and tropical depression strength through September 4–5 before curving sharply to the north. By September 6, Fred's circulation pattern had diminished considerably, and the storm dissipated later that day.

    Under threat from the hurricane, all of Cape Verde was placed under a hurricane warning for the first time in the nation's history. Gale-force winds battered much of the Barlavento region throughout August 31, downing trees and utility poles. On the easternmost islands of Boa Vista and Sal, Fred leveled roofs and left villages without power or phone services for a few days. About 70 percent of the houses in Povoação Velha suffered light to moderate damage. Across the northernmost islands, rainstorms flooded homes, washed out roads, and ruined farmland; São Nicolau endured great losses of crops and livestock. Material damage across Cape Verde totaled US$2.5 million, though the rain's overall impact on agriculture was positive and replenishing. Swells from the hurricane produced violent seas along the West African shoreline, destroying fishing villages and submerging swaths of residential areas in Senegal. Between the coasts of West Africa and Cape Verde, maritime incidents related to Fred resulted in nine deaths. (Full article...)
  • Tree habit, Jandakot Botanical Gardens

    Banksia menziesii, commonly known as firewood banksia, is a species of flowering plant in the genus Banksia. It is a gnarled tree up to 10 m (33 ft) tall, or a lower spreading 1–3 m (3.3–9.8 ft) shrub in the more northern parts of its range. The serrated leaves are dull green with new growth a paler grey green. The prominent autumn and winter inflorescences are often two-coloured red or pink and yellow, and their colour has given rise to more unusual common names such as port wine banksia and strawberry banksia. Yellow blooms are rarely seen.

    First described by the botanist Robert Brown in the early 19th century, no separate varieties of Banksia menziesii are recognised. It is found in Western Australia, from the Perth (32° S) region north to the Murchison River (27° S), and generally grows on sandy soils, in scrubland or low woodland. Banksia menziesii provides food for a wide array of invertebrate and vertebrate animals; birds and in particular honeyeaters are prominent visitors. A relatively hardy plant, Banksia menziesii is commonly seen in gardens, nature strips and parks in Australian urban areas with Mediterranean climates, but its sensitivity to dieback from the soil-borne water mould Phytophthora cinnamomi makes it short-lived in places with humid summers, such as Sydney. Banksia menziesii is widely used in the cut flower industry both in Australia and overseas. (Full article...)
  • Go Man Go (1953–1983) was an American Quarter Horse stallion and race horse. He was named World Champion Quarter Running Horse three times in a row, one of only two horses to achieve that distinction. Go Man Go was considered to be of difficult temperament. While waiting in the starting gate for his first race, he threw his jockey, broke down the gate, and ran alone around the track; he was eventually caught and went on to win the race. During his five years of competition until his retirement from racing in 1960 he had 27 wins, earning more than $86,000 (approximately $Expression error: Unrecognized punctuation character ",". as of 2021).

    Neither of Go Man Go's parents raced. His sire (father), the Thoroughbred stallion Top Deck, was bred by the King Ranch. His dam (mother) hailed from Louisiana; Go Man Go is thought to have gained his swiftness on the track from her. For the first years of Go Man Go's racing career, his owner faced difficulty in registering him with the American Quarter Horse Association (AQHA), a matter that remained unresolved until 1958. (Full article...)

  • Blakeney Point (designated as Blakeney National Nature Reserve) is a national nature reserve situated near to the villages of Blakeney, Morston and Cley next the Sea on the north coast of Norfolk, England. Its main feature is a 6.4 km (4 mi) spit of shingle and sand dunes, but the reserve also includes salt marshes, tidal mudflats and reclaimed farmland. It has been managed by the National Trust since 1912, and lies within the North Norfolk Coast Site of Special Scientific Interest, which is additionally protected through Natura 2000, Special Protection Area (SPA), International Union for Conservation of Nature (IUCN) and Ramsar listings. The reserve is part of both an Area of Outstanding Natural Beauty (AONB), and a World Biosphere Reserve. The Point has been studied for more than a century, following pioneering ecological studies by botanist Francis Wall Oliver and a bird ringing programme initiated by ornithologist Emma Turner.

    The area has a long history of human occupation; ruins of a medieval monastery and "Blakeney Chapel" (probably a domestic dwelling) are buried in the marshes. The towns sheltered by the shingle spit were once important harbours, but land reclamation schemes starting in the 17th century resulted in the silting up of the river channels. The reserve is important for breeding birds, especially terns, and its location makes it a major site for migrating birds in autumn. Up to 500 seals may gather at the end of the spit, and its sand and shingle hold a number of specialised invertebrates and plants, including the edible samphire, or "sea asparagus". (Full article...)
  • A large flap lesion in the femur head typical of late stage Osteochondritis dissecans. In this case, the lesion was caused by avascular necrosis of the bone just under the cartilage.

    Osteochondritis dissecans (OCD or OD) is a joint disorder primarily of the subchondral bone in which cracks form in the articular cartilage and the underlying subchondral bone. OCD usually causes pain during and after sports. In later stages of the disorder there will be swelling of the affected joint which catches and locks during movement. Physical examination in the early stages does only show pain as symptom, in later stages there could be an effusion, tenderness, and a crackling sound with joint movement.


    OCD is caused by blood deprivation of the secondary physes around the bone core of the femoral condyle. This happens to the epiphyseal vessels under the influence of repetitive overloading of the joint during running and jumping sports. During growth such chondronecrotic areas grow into the subchondral bone. There it will show as bone defect area under articular cartilage. The bone will then possibly heal to the surrounding condylar bone in 50% of the cases. Or it will develop into a pseudarthrosis between condylar bone core and osteochondritis flake leaving the articular cartilage it supports prone to damage. The damage is executed by ongoing sport overload. The result is fragmentation (dissection) of both cartilage and bone, and the free movement of these bone and cartilage fragments within the joint space, causing pain, blockage and further damage. OCD has a typical anamnesis with pain during and after sports without any history of trauma. Some symptoms of late stages of osteochondritis dissecans are found with other diseases like rheumatoid disease of children and meniscal ruptures. However, the disease can be confirmed by X-rays, computed tomography (CT) or magnetic resonance imaging (MRI) scans. (Full article...)
  • Portrait by Gerard Soest between 1657 and 1660

    Francis Willughby (sometimes spelt Willoughby) FRS (22 November 1635 – 3 July 1672) was an English ornithologist and ichthyologist, and an early student of linguistics and games.

    He was born and raised at Middleton Hall, Warwickshire, the only son of an affluent country family. He was a student at Trinity College, Cambridge, where he was tutored by the mathematician and naturalist John Ray, who became a lifetime friend and colleague, and lived with Willughby after 1662 when he lost his livelihood through his refusal to sign the Act of Uniformity. Willughby was elected as a Fellow of the Royal Society in 1661, then aged 27. (Full article...)

  • Typhoon Rusa was the most powerful typhoon to strike South Korea in 43 years. It was the 21st JTWC tropical depression, the 15th named storm, and the 10th typhoon of the 2002 Pacific typhoon season. It developed on August 22 from the monsoon trough in the northwestern Pacific Ocean, well to the southeast of Japan. For several days, Rusa moved to the northwest, eventually intensifying into a powerful typhoon. On August 26, the storm moved across the Amami Islands of Japan, where Rusa left 20,000 people without power and caused two fatalities. Across Japan, the typhoon dropped torrential rainfall peaking at 902 mm (35.5 in) in Tokushima Prefecture.

    After weakening slightly, Rusa made landfall on Goheung, South Korea with winds of 140 km/h (85 mph 10 minute sustained). It was able to maintain much of its intensity due to warm air and instability from a nearby cold front. Rusa weakened while moving through the country, dropping heavy rainfall that peaked at 897.5 mm (35.33 in) in Gangneung. A 24-hour total of 880 mm (35 in) in the city broke the record for the highest daily precipitation in the country; however, the heaviest rainfall was localized. Over 17,000 houses were damaged, and large areas of crop fields were flooded. In South Korea, Rusa killed at least 233 people, making it the deadliest typhoon there in over 43 years, and caused $4.2 billion in damage. The typhoon also dropped heavy rainfall in neighboring North Korea, leaving 26,000 people homeless and killing three. Rusa also destroyed large areas of crops in the country already affected by ongoing famine conditions. The typhoon later became extratropical over eastern Russia on September 1, dissipating three days later. (Full article...)

  • Hurricane Claudette was the third tropical storm and first hurricane of the 2003 Atlantic hurricane season. A fairly long-lived July Atlantic hurricane, Claudette began as a tropical wave in the eastern Caribbean. It moved quickly westward, brushing past the Yucatán Peninsula before moving northwestward through the Gulf of Mexico. Claudette remained a tropical storm until just before making landfall in Port O'Connor, Texas, when it quickly strengthened to a strong Category 1 hurricane on the Saffir-Simpson Hurricane Scale. Forecasting of its path and intensity was uncertain throughout its lifetime, resulting in widespread and often unnecessary preparations along its path.

    Claudette was the first hurricane to make landfall in July in the United States since Hurricane Danny in the 1997 season. The hurricane caused two deaths and moderate damage in Texas, mostly from strong winds, as well as extensive beach erosion. Because of the damage, President George W. Bush declared portions of South Texas a Federal Disaster Area, allowing the affected citizens to apply for aid. Claudette also caused significant rainfall and minor damage in the Mexican state of Quintana Roo as a tropical storm, as well as minor damage on Saint Lucia before developing into a tropical cyclone. (Full article...)
  • Franklin in 2006 during the launch of The Ursula Franklin Reader at Massey College in Toronto

    Ursula Martius Franklin CC OOnt FRSC (16 September 1921 – 22 July 2016) was a German-Canadian metallurgist, research physicist, author, and educator who taught at the University of Toronto for more than 40 years. She was the author of The Real World of Technology, which is based on her 1989 Massey Lectures; The Ursula Franklin Reader: Pacifism as a Map, a collection of her papers, interviews, and talks; and Ursula Franklin Speaks: Thoughts and Afterthoughts, containing 22 of her speeches and five interviews between 1986 and 2012. Franklin was a practising Quaker and actively worked on behalf of pacifist and feminist causes. She wrote and spoke extensively about the futility of war and the connection between peace and social justice. Franklin received numerous honours and awards, including the Governor General's Award in Commemoration of the Persons Case for promoting the equality of girls and women in Canada and the Pearson Medal of Peace for her work in advancing human rights. In 2012, she was inducted into the Canadian Science and Engineering Hall of Fame. A Toronto high school, Ursula Franklin Academy, has been named in her honour.

    Franklin is best known for her writings on the political and social effects of technology. For her, technology was much more than machines, gadgets or electronic transmitters. It was a comprehensive system that includes methods, procedures, organization, "and most of all, a mindset". She distinguished between holistic technologies used by craft workers or artisans and prescriptive ones associated with a division of labour in large-scale production. Holistic technologies allow artisans to control their own work from start to finish. Prescriptive technologies organize work as a sequence of steps requiring supervision by bosses or managers. Franklin argued that the dominance of prescriptive technologies in modern society discourages critical thinking and promotes "a culture of compliance". (Full article...)
  • Common octopus
    (Octopus vulgaris)

    Octopus (plural octopuses) relates to approximately 300 species of soft-bodied, eight-limbed molluscs of the order Octopoda (/ɒkˈtɒpədə/, ok-TO-pə-də). The order is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids. Like other cephalopods, an octopus is bilaterally symmetric with two eyes and a beak, with its mouth at the center point of the eight limbs. The soft body can rapidly alter its shape, enabling octopuses to squeeze through small gaps. They trail their eight appendages behind them as they swim. The siphon is used both for respiration and for locomotion, by expelling a jet of water. Octopuses have a complex nervous system and excellent sight, and are among the most intelligent and behaviourally diverse of all invertebrates.

    Octopuses inhabit various regions of the ocean, including coral reefs, pelagic waters, and the seabed; some live in the intertidal zone and others at abyssal depths. Most species grow quickly, mature early, and are short-lived. In most species, the male uses a specially adapted arm to deliver a bundle of sperm directly into the female's mantle cavity, after which he becomes senescent and dies, while the female deposits fertilised eggs in a den and cares for them until they hatch, after which she also dies. Strategies to defend themselves against predators include the expulsion of ink, the use of camouflage and threat displays, the ability to jet quickly through the water and hide, and even deceit. All octopuses are venomous, but only the blue-ringed octopuses are known to be deadly to humans. (Full article...)
  • American grasshopper (Schistocerca americana)

    Grasshoppers are a group of insects belonging to the suborder Caelifera. They are among what is probably the most ancient living group of chewing herbivorous insects, dating back to the early Triassic around 250 million years ago.

    Grasshoppers are typically ground-dwelling insects with powerful hind legs which allow them to escape from threats by leaping vigorously. As hemimetabolous insects, they do not undergo complete metamorphosis; they hatch from an egg into a nymph or "hopper" which undergoes five moults, becoming more similar to the adult insect at each developmental stage. At high population densities and under certain environmental conditions, some grasshopper species can change color and behavior and form swarms. Under these circumstances, they are known as locusts. (Full article...)
  • T. d. derbianus
    Senegal

    The giant eland (Taurotragus derbianus), also known as the Lord Derby eland, is an open-forest and savanna antelope. A species of the family Bovidae and genus Taurotragus, it was described in 1847 by John Edward Gray. The giant eland is the largest species of antelope, with a body length ranging from 220–290 cm (86.5–114 in). There are two subspecies: T. d. derbianus and T. d. gigas.

    The giant eland is a herbivore, eating grasses, foliage and branches. They usually form small herds consisting of 15–25 members, both males and females. Giant elands are not territorial, and have large home ranges. They are naturally alert and wary, which makes them difficult to approach and observe. They can run at up to 70 km/h (43 mph) and use this speed as a defence against predators. Mating occurs throughout the year but peaks in the wet season. They mostly inhabit broad-leafed savannas, woodlands and glades. (Full article...)
  • An assortment of millipedes (not to scale)

    Millipedes are a group of arthropods that are characterised by having two pairs of jointed legs on most body segments; they are known scientifically as the class Diplopoda, the name being derived from this feature. Each double-legged segment is a result of two single segments fused together. Most millipedes have very elongated cylindrical or flattened bodies with more than 20 segments, while pill millipedes are shorter and can roll into a ball. Although the name "millipede" derives from the Latin for "thousand feet", no known species has 1,000; the record of 750 legs belongs to Illacme plenipes. There are approximately 12,000 named species classified into 16 orders and around 140 families, making Diplopoda the largest class of myriapods, an arthropod group which also includes centipedes and other multi-legged creatures.

    Most millipedes are slow-moving detritivores, eating decaying leaves and other dead plant matter. Some eat fungi or suck plant fluids, and a small minority are predatory. Millipedes are generally harmless to humans, although some can become household or garden pests. Millipedes can be unwanted especially in greenhouses where they can cause severe damage to emergent seedlings. Most millipedes defend themselves with a variety of chemicals secreted from pores along the body, although the tiny bristle millipedes are covered with tufts of detachable bristles. Its primary defence mechanism is to curl into a tight coil, thereby protecting its legs and other vital delicate areas on the body behind a hard exoskeleton. Reproduction in most species is carried out by modified male legs called gonopods, which transfer packets of sperm to females. (Full article...)

  • Severe Tropical Cyclone Ada was a small but intense tropical cyclone that severely impacted the Whitsunday Region of Queensland, Australia, in January 1970. It has been described as a defining event in the history of the Whitsunday Islands, and was the most damaging storm in the mainland town of Proserpine's history at the time. Forming over the far eastern Coral Sea in early January, the weather disturbance that would become Ada remained weak and disorganised for nearly two weeks as it slowly moved in a clockwise loop. Accelerating toward the southwest, the system was named Ada on 15 January. All observations of the fledgling cyclone were made remotely with weather satellite imagery until it passed over an automated weather station on 16 January. The extremely compact cyclone, with a gale radius of just 55 km (35 mi), intensified into a Category 3 severe tropical cyclone just before striking the Whitsunday Islands at 14:00 UTC on 17 January. At 18:30 UTC, Ada's eye crossed the coast at Shute Harbour. The cyclone made little inland progress before stalling northwest of Mackay and dissipating on 19 January.

    Ada devastated several resort islands in the Whitsundays, in some cases destroying virtually all facilities and guest cabins. The biggest resort, located on Daydream Island, was obliterated, with similar destruction seen on South Molle, Hayman, and Long islands; since most boats docked on these islands were destroyed, hundreds of tourists in these resorts became stranded and required emergency rescue. Based on the severity of the damage, wind gusts were later estimated at 220 km/h (140 mph) . As Ada moved ashore, most homes were damaged or destroyed in communities near the storm's landfall point, including Cannonvale, Airlie Beach, and Shute Harbour. Extreme rainfall totals as high as 1,250 mm (49 in) caused massive river flooding in coastal waterways between Bowen and Mackay. The floodwaters washed out roads and left some locations isolated for days. Offshore, seven people were missing and presumed dead after their fishing trawler encountered the cyclone. Ada killed a total of 14 people, including 11 at sea, and caused A$12 million in damage. The cyclone revealed inadequacies in the warning broadcast system, and served as the impetus for enhanced cyclone awareness programs that have been credited with saving lives in subsequent cyclones. In January 2020, on the 50th anniversary of the disaster, a memorial to the storm victims was erected along the shoreline at Airlie Beach. (Full article...)

Выбранное изображение

Млечный Путь является спиральной галактикой с перемычкой из Местной группы . Хотя Млечный Путь - всего лишь одна из миллиардов галактик во Вселенной , Галактика имеет особое значение для человечества, поскольку она является домом для Солнечной системы . Термин «молочный» происходит от туманной полосы белого света, появляющейся через видимую с Земли небесную сферу , которая состоит из звезд и другого материала, лежащего в галактической плоскости . Тот факт, что Млечный Путь делит ночное небо на два примерно равных полушария указывает на то, что Солнечная система расположена близко к галактической плоскости.

Избранная биография

Клавдий Гален из Пергама ( 129 - 200 гг. Н.э.), более известный на английском языке как Гален , был древнегреческим врачом . Его взгляды преобладали в европейской медицине более тысячи лет. С современной точки зрения теории Галена были частично правильными и частично ошибочными: он продемонстрировал, что по артериям переносится кровь, а не воздух, и провел первые исследования функций нервов , мозга и сердца . Он также утверждал, что разум находится в мозгу, а не в сердце, какутверждал Аристотель .

Однако большая часть понимания Галена ошибочна с современной точки зрения. Например, он не распознал кровообращение и думал, что венозная и артериальная системы разделены. Эта точка зрения не изменилась до работы Уильяма Харви в 17 веке .

Вы знали...

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  • ... что Rufous коронованный Воробей , среднего размера воробей на юго - западе Соединенных Штатов и Мексики , имеет подвидов эндемичных к Todos Santos островов , которые не видели с 1970 - х годов?
  • ... Рождественский Нор'астер 1994 привел к порывам ветра со скоростью 99 миль в час / 86 узлов в Массачусетсе и ненадолго обрадовал ?
  • ... что северная красноногая лягушка - это находящийся под угрозой исчезновения вид , самец которой ночной жизнью защищает территорию нерестилищного пруда ?

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