Теги форумов: наука

Фильтр: техника, химия, биология, NGS, Гаттака
Теги : наука, техника, химия, биология, NGS, Гаттака
 
Тема
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2017-07-16, кщееш: Ишь ты Разрешено к продаже профилактическое средство от СПИДа | Cursorinfo //  cursorinfo.co.il  
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2016-10-24, vacheron: Тема термоядерный синтез. Кто знает данную тематику?
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2016-02-04, Виктор Банев: … Как там Милка Иовович? В тонусе? Не состарилась?
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2015-10-07, Серокой: … ..! Семён Семёнович!
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2001-10-02, <au>: Nazrevaet "competitive advantage" na prostorah Byvshego.. UK tackles student shortage [1 Oct 2001] Ways of increasing the number of physics undergraduates in the UK, including the introduction of less-mathematical degrees, are contained in a new report being published by the Institute of Physics this month. Set up a year ago by Institute president Sir Peter Williams, the inquiry is the Institute's first major look at university education for ten years. Fifteen recommendations designed to bolster undergraduate physics are contained in the report. The inquiry panel believes that more must be done to promote physics to young people and that the critical shortage of physics teachers in schools must be addressed at a national level. In the report, the panel says that MPhys and BSc courses must remain the primary source of highly qualified physicists, but it believes that there is a case for less mathematically demanding physics degrees. The report also states that the funding of physics departments must be…
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2001-10-02, Kuznets: … Вот это особенно прикольно. Ведь как известно энергия в никуда не девается и ниоткуда не берется (см. холодильник ). Хотя если они там у себя локально термодинамику отменят - тогда понятно ...
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2001-10-01, =KRoN=: … монохром...
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2001-09-27, <au>: Entangled clouds raise hope of teleportation Clouds of trillions of atoms have for the first time been linked by quantum "entanglement" - that spooky, almost telepathic link between distant particles. The feat opens new possibilities for quantum communication systems and sci-fi-style teleporting of objects from one place to another. The everyday view of atoms is of solid, independent objects a bit like billiard balls. But according to quantum theory, atoms are far less concrete entities. Atoms can be persuaded to interact with each other so that events affecting one instantly affect another - no matter how far apart they are. Dubbed entanglement, this could open the way to superfast quantum communications systems and ways of teleporting objects by instantly transferring their properties from place to place. Before now scientists only managed to entangle a few atoms close together, raising a question mark over the practicality of quantum technology. But now a team at the University of Aarhus in Denmark has…
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2001-09-25, TheFreak: … Могу предположить, что ничего не почувствует. Абсолютно ничего. Даже и не догадается сперва чтО произошло. P.S. А можно и так: потемнение в глазах — потеря сознания — очнулась — вырвало. Но это будет дешево... А может и нет. Как…
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2001-09-16, <au>: EMPTY SPACES CAN EXERT FORCES ON EACH OTHER through the action of intervening matter, a US-German team has proposed (Aurel Bulgac, University of Washington, 206-685-2988, bulgac phys.washington .edu). If experimentally confirmed, this effect would constitute a new kind of force, akin to the traditional "Casimir force," the slight attraction between two metallic plates in a vacuum. The traditional Casimir attraction occurs because of the fleeting electromagnetic fields that exist in the vacuum. These fields exert forces on the plates. In between the plates, however, certain electromagnetic waves cannot reside, namely those with wavelengths larger than the plate separation. This imbalance of electromagnetic forces serves to push the plates together. In the newly proposed force, two or more cavities (empty regions of space) alter the waves associated with surrounding matter in the form of non-interacting fermions, such as a gas of electrons. For a simple example, consider two hollow spheres separated by a sea…
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2001-09-11, Stillet: Господа! Срочно требуется методика расчета на устойчивость, поверочного расчета и расчета остаточного ресурса дымовой трубы ТЭС. Труба стальная самонесущая. Буду очень благодарен, если хотя бы укажете, где искать. Предлагать искать в Инете не стоит... я там уже был.
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2001-09-07, <: Ссылку важную чуть не забыл указать: 404. Страница не найдена Московский авиационный институт (государственный технический университет) — традиции, инновации, достижения // ftp.mai.ru  
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2001-09-06, <au>: "Environmentally friendly" explosives get ready for ignition 14:20 05 September 01 Damian Carrington, Glasgow The advent of environmentally friendly explosives has moved a step closer, with German scientists solving the problem of water absorption in one promising compound - the moisture literally turns the compound into a damp squib. "It may sound strange that military are concerned about health and safety," says Thomas Klapotke, at the University of Munich. "But 99.9 percent of missile launches and explosions take place in training, over your own territory and involving your own personnel." Conventional explosives and missile propellants are packed with metals and halogens, which can be harmful before and after combustion. Even guns can produce smogs of lead compounds in the indoor shooting ranges now used by many police forces, because lead azide is used as the initiator. "I would not call them environmentally friendly, but environmentally compatible," Klapotke told New Scientist. But replacing…
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2001-09-04, fast: Трубчатая батарейка 4 сентября 2001 г. В настоящее время ученые со всего мира уделяют огромное внимание пока-что неизученным до конца свойствам нонотрубок. Недавно в лаборатории компании NEC был создан прототип первой батарейки на основе углеродных нанотрубок. При разработке нового элемента питания трубки особой рогоподобной формы (называемые также "nanohorns") были использованы в качестве электродов топливного элемента - источника питания нового поколения, где энергия химической реакции водорода и кислорода превращается в электричество напрямую. В результате удалось получить элемент с емкостью, более чем в 10 раз превышающей емкость стандартного литий-ионного аккумулятора таких же размеров. Подобный эффект был достигнут за счет резкого уменьшения размеров частиц катализатора, наносимых на поверхность электрода, и за счет увеличения площади самих электродов. Все это обеспечило лучшую интенсивность протекания химической реакции и, как следствие – белее высокие показатели емкости элемента. Полученные…
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2001-09-04, varban: Сайт журнала: Ошибка - документ не найден Если подписаться, высылают линки на трех последных номеров - пока бесплатно. Я бы мог выложить, но очевидно редакция другого мнения, если не повесила в открытую: quote: Дорогие читатели! Уступая вашим многочисленным просьбам, мы решили в течение полугода вывешивать в Интернете наш журнал в PDF-формате и предоставлять к нему доступ всем тем, кто зарегистрировался. Если у этого вида журнала окажется достаточно много читателей, со второй половины года мы начнем подписку на журнал в электронном виде.  
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2001-08-23, <au>: Mini nuclear reactor could power apartment blocks 19:00 22 August 01 Peter Hadfield and Michael Fitzpatrick A nuclear reactor designed to generate power in the basement of an apartment block is being developed in Japan. In the past few months government-backed researchers have been testing a fail-safe mechanism for the reactor, which will close down automatically if it overheats. Photo: Stone The Rapid-L reactor was conceived as a powerhouse for colonies on the Moon. But at six metres high and only two metres wide this 200-kilowatt reactor could relatively easily fit into the basement of an office building or apartment block, where it would have to be housed in a solid containment building. "In the future it will be quite difficult to construct further large nuclear power plants because of site restrictions," says Mitsuru Kambe, head of the research team at Japan's Central Research Institute of Electrical Power Industry (CRIEPI). "To relieve peak loads in the near future, I believe small, modular reactors…
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2001-08-23, <au>: Fragment of ancient asteroid falls to Earth [23 Aug 2001] A meteorite that plunged to Earth in January 2000 may be the first fragment ever found of a primitive kind of asteroid. The characteristics of the Tagish Lake meteorite closely match the 'D-type' asteroids common in the outer solar system, according to Takahiro Hiroi of Brown University, US, and colleagues. Meanwhile, Sandra Pizzarello of Arizona State University and team analysed the carbon-rich meteorite to shed light on the chemistry of the early solar system (T Hiroi et al; S Pizzarello et al 2001 Science to appear). Asteroids are classified by their optical properties and their dynamics. Most meteorites are thought to be fragments of asteroids, so the spectrum and brightness of the light reflected from a meteorite helps astronomers to identify which type of asteroid it came from. The arrival time of the meteorite on Earth is also a crucial factor in matching it to the motion of a certain asteroid. Hiroi and colleagues found that the Tagish Lake…
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2001-08-23, <au>: Lasers energise fusion research [23 Aug 2001] A new method to kick-start nuclear fusion has boosted hopes of harnessing the energy that powers the Sun. Scientists from Japan and the UK have used lasers to both compress and ignite the nuclear fuel, a technique that could be scaled-up to power reactors that produce hundreds of times more energy than they consume (R Kodama et al 2001 Nature 412 798). Nuclear fusion is an attractive potential source of energy because the two isotopes of hydrogen used for fuel - deuterium and tritium - are readily available. It also produces no carbon dioxide or long-lived radioactive decay products. However, a temperature of about 50 million degrees is required to overcome the repulsion between the fusing deuterium and tritium nuclei. The new 'fast ignition' technique has been demonstrated by Ryosuke Kodama and colleagues of Osaka University and researchers from the Rutherford Appleton Laboratory, Imperial College and the University of York in the UK. Like the conventional…
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2001-08-23, <au>: First hints of novel nuclei [21 Aug 2001] A super-heavy isotope of hydrogen that has four neutrons and a proton in its nucleus has been detected for the first time. Physicists have been attempting to create hydrogen-5 - which is thought to exist inside stars - for over 40 years. An international collaboration identified the highly unstable isotope at the RIKEN detector in Japan (A Korsheninnikov et al 2001 Phys. Rev. Lett. 87 092501). Meanwhile, physicists at Brookhaven National Laboratory in the US have created a significant number of nuclei containing two 'strange' quarks. Such matter is thought to be abundant in neutron stars (J Ahn et al 2001 Phys. Rev. Lett. to appear). Physicists from RIKEN, the JINR and Kurchatov laboratories in Russia, and the GANIL laboratory in France detected the hydrogen-5 in collisions between a beam of helium-6 nuclei and a cryogenic hydrogen target. When a helium-6 nucleus collides with a hydrogen nucleus, it can donate all four of its neutrons to the hydrogen. This leaves two…
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2001-08-22, CaRRibeaN: … Температура воздуха от высоты там вводиться эксперементальная. Вообще очень просто - есть формулы по температуре излучения неравномерно нагретого прозрачного тела домножаем на плотность - вуаля. Все достаточно прозрачно
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2001-08-21, varban: Ссылка хорошая, я несколько недель назад ее зацепил яндексом - искал материалы об акумуляторах
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2001-08-20, <Rodik>: Где-то читал о том, что основным тормозом планеты является все-таки - Луна...
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2001-08-20, CaRRibeaN: Нууу, справедливости ради углеводородные топливные ячейки еще далеки от кондиции, метановым даже еще плыть и плыть до комерческого применения...
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2001-08-16, <au>: Ion strings make brilliant beams [15 Aug 2001] Physicists have long struggled to combat heating in the ion beams used in high-energy experiments. Laser cooling can be used to reduce collisions between the ions, which create heat and reduce the energy of the beam. Now Ulrich Schramm and colleagues at the University of Mьnich have created the first 'crystalline' ion beam, which is virtually free from collisions. "The crystalline beam is the ultimate state for an ion beam in terms of brilliance and stability", Schramm told PhysicsWeb. "It represents a different phase and has its own properties" (T Schдtz et al 2001 Nature 412 717). Collisions in high-energy ion beams reduce the beam intensity and can be remedied by extra focusing devices or the use of low-density beams. However, physicists predicted 20 years ago that in a sufficiently cool beam, the ions would not collide because their Coulomb repulsion would outweigh their kinetic energy. Such 'crystallization' has been achieved before in ion traps - in which…
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2001-08-15, <au>: When is a constant not a constant? [14 Aug 2001] The so-called fundamental physical constants might not be so constant after all. Astronomical measurements of the fine structure constant - the dimensionless number that determines the strength of interactions between charged particles and electromagnetic fields - suggest that this particular constant is increasing ever so slightly with time. If the result survives further scrutiny, it will have major implications for particle physics and cosmology (J K Webb et al 2001 Phys. Rev. Lett. 87 091301). The fine structure constant, alpha, is defined as e2/c h-bar, where e is the charge on the electron, h-bar is the Planck constant divided by 2 pi, and c is the speed of light, and is about 1/137. If alpha changes with time then at least one of the fundamental constants of physics - e, h-bar or c - must also change with time. Although no evidence has ever been detected for any of these constants changing, such behaviour is predicted by various unified theories of the…
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