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Although the stable isotopes argon and argon make up all but a trace of this element in the universe, the third stable isotope, argon , makes up Argon and argon make up 0. The gas slowly leaks into the atmosphere from the rocks in which it is still being formed. Argon is isolated on a large scale by the fractional distillation of liquid air. It is used in gas-filled electric light bulbs, radio tubes, and Geiger counters. It also is widely utilized as an inert atmosphere for arc-welding metals, such as aluminum and stainless steel ; for the production and fabrication of metals, such as titanium , zirconium , and uranium ; and for growing crystals of semiconductors , such as silicon and germanium. An electric discharge through argon at low pressure appears pale red and at high pressure, steely blue.

Essex Museums

Bring fact-checked results to the top of your browser search. Chemistry and society For the first two-thirds of the 20th century, chemistry was seen by many as the science of the future. The potential of chemical products for enriching society appeared to be unlimited. Increasingly, however, and especially in the public mind, the negative aspects of chemistry have come to the fore. Disposal of chemical by-products at waste-disposal sites of limited capacity has resulted in environmental and health problems of enormous concern.

Mass spectrometry: Mass spectrometry, analytic technique by which chemical substances are identified by the sorting of gaseous ions in electric and magnetic fields according to their mass-to-charge ratios. The instruments used in such studies are called mass spectrometers and mass spectrographs, and they operate on.

Displays and exhibitions include: It is surrounded by the beautiful Walled Gardens. The four main Galleries tell the story of Harlow over four periods: Check their website for winter opening hours Havering Museum is on part of the site of the old Romford Brewery. Events and exhibitions are held throughout the year website Jaywick Martello Tower The Jaywick Martello tower was built as part of the east coast defences during the Napoleonic Wars.

It is now an art gallery and community facility which supports creative collaborations relating to the themes of Community, Heritage and Environment that affect our lives today. Essex Days Out Tips: One of a string of Martello towers — why not start a walk from Clacton and see how many you can pass — Martello bagging rather than Munro bagging. Leigh Heritage Centre High Street, Old Leigh Two old cottages and the old smithy have been saved from redevelopment and now houses the centre.

An atmospheric little museum and well worth keeping an eye open for on a trip to Old Leigh.

Essex Museums

Introduction Almost since the beginning, humanity’s interest in Antarctica has been rooted in scientific curiosity. Initially, that curiosity was simply geographical, though many of the early explorers also took weather readings and collected biological samples when possible. Captain James Cook made every effort to collect scientific specimens and record data, though his primary goal was to locate the southern continent. Even some of the early sealers, whose overriding objective was profit, made an effort to carefully chart newly discovered land and collect scientific samples.

James Weddell, for example, brought back the first samples of a new species, the weddell seal. For a more complete accounting of human exploration in Antarctica, see the History section on this site.

Dans le cadre d’une diète de type méditerranéenne, il est conseillé de consommer des poissons dits gras, c’est à dire riches en acides gras poly insaturés de la série oméga 3.

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Pflugerville, TX danny hare said: Not unless there is a stamp on the heel of the neck you’ll have to take it off to find that. Fender doesn’t have detailed records on anything prior to That’s why a lot of even more recent guitars you can only narrow it down to a year or two range, because sometimes months pass between when a neck is made and when it is assembled onto a body to make a complete guitar.

May 01,  · Treatise on Geophysics, Second Edition, is a comprehensive and in-depth study of the physics of the Earth beyond what any geophysics text has provided previously. Thoroughly revised and updated, it provides fundamental and state-of-the-art discussion of all aspects of geophysics.

It is the colour worn by a cardinal of the Catholic Church. The cardinal takes its name from the colour worn by Catholic cardinals. Pink is a pale shade of red. Vermilion is similar to scarlet, but slightly more orange. This is sindoor , a red cosmetic powder used in India; Some Hindu women put a stripe of sindoor in their hair to show they are married. Maple tree with red leaves in the morning mist Estonia Crimson is a strong, deep red containing a little blue.

The emblem of Harvard University.

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Mass spectrometry differs from the types of spectroscopy previously discussed because the molecular information that the technique provides does not depend on absorption of electromagnetic radiation. In a mass spectrometer, molecules are converted to charged fragments called ions, which are then separated according… History The foundation of mass spectroscopy was laid in , when Wilhelm Wien, a German physicist, discovered that beams of charged particles could be deflected by a magnetic field.

In more refined experiments carried out between and , the British physicist J. Thomson , who had already discovered the electron and observed its deflection by an electric field , passed a beam of positively charged ions through a combined electrostatic and magnetic field. The net result was that the ions produced a series of parabolic curves on a photographic plate placed in their paths.

Each parabola corresponded to ions of a particular mass-to-charge ratio with the specific position of each ion dependent on its velocity; the lengths of the parabolic curves provided a measure of the range of ion energies contained in the beam.

Antananarivo, Madagascar U.S. Embassy Antananarivo alerts U.S. citizens to a plague outbreak which occurs each year in Madagascar. To date, there have been confirmed cases and deaths.

Then, on October 6, , Michel Mayor and Didier Queloz of the Geneva Observatory announced the first definitive detection of an exoplanet orbiting an ordinary main-sequence star 51 Pegasi. Many known extrasolar planets are many times the mass of Jupiter, approaching that of stellar objects known as brown dwarfs. Brown dwarfs are generally considered stars due to their ability to fuse deuterium , a heavier isotope of hydrogen. Although objects more massive than 75 times that of Jupiter fuse hydrogen, objects of only 13 Jupiter masses can fuse deuterium.

Deuterium is quite rare, and most brown dwarfs would have ceased fusing deuterium long before their discovery, making them effectively indistinguishable from supermassive planets. There were particular disagreements over whether an object should be considered a planet if it was part of a distinct population such as a belt , or if it was large enough to generate energy by the thermonuclear fusion of deuterium. A growing number of astronomers argued for Pluto to be declassified as a planet, because many similar objects approaching its size had been found in the same region of the Solar System the Kuiper belt during the s and early s.

Pluto was found to be just one small body in a population of thousands. Some of them, such as Quaoar , Sedna , and Eris , were heralded in the popular press as the tenth planet , failing to receive widespread scientific recognition. Acknowledging the problem, the IAU set about creating the definition of planet , and produced one in August The number of planets dropped to the eight significantly larger bodies that had cleared their orbit Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune , and a new class of dwarf planets was created, initially containing three objects Ceres , Pluto and Eris.

The positions statement incorporates the following guidelines, mostly focused upon the boundary between planets and brown dwarfs: The minimum mass and size required for an extrasolar object to be considered a planet should be the same as that used in the Solar System.

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Red is the color at the end of the visible spectrum of light, next to orange and opposite has a dominant wavelength of approximately – nanometres. It is a primary color in the RGB color model and the CMYK color model, and is the complementary color of range from the brilliant yellow-tinged scarlet and vermillion to bluish-red crimson, and vary in shade from the pale.

Then, on October 6, , Michel Mayor and Didier Queloz of the Geneva Observatory announced the first definitive detection of an exoplanet orbiting an ordinary main-sequence star 51 Pegasi. Many known extrasolar planets are many times the mass of Jupiter, approaching that of stellar objects known as brown dwarfs. Brown dwarfs are generally considered stars due to their ability to fuse deuterium , a heavier isotope of hydrogen. Although objects more massive than 75 times that of Jupiter fuse hydrogen, objects of only 13 Jupiter masses can fuse deuterium.

Deuterium is quite rare, and most brown dwarfs would have ceased fusing deuterium long before their discovery, making them effectively indistinguishable from supermassive planets. There were particular disagreements over whether an object should be considered a planet if it was part of a distinct population such as a belt , or if it was large enough to generate energy by the thermonuclear fusion of deuterium.

A growing number of astronomers argued for Pluto to be declassified as a planet, because many similar objects approaching its size had been found in the same region of the Solar System the Kuiper belt during the s and early s. Pluto was found to be just one small body in a population of thousands. Some of them, such as Quaoar , Sedna , and Eris , were heralded in the popular press as the tenth planet , failing to receive widespread scientific recognition.

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Embu, Brazil Antananarivo, Madagascar U. Embassy Antananarivo alerts U. To date, there have been confirmed cases and deaths Call on H. Semaine de l AGRO du septembre: Colloque International, Sortie de promotion, Divertissements, Expositions.

A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.. The term planet is ancient, with ties to history, astrology, science, mythology, and planets in the Solar System are visible to the naked eye.

Materials separated and recycled wherever possible. Soft Strip – removing fixtures, fittings, services, temporary structures, assessing structural design and unexpected finds such as asbestos or structural anomalies. Asbestos removal and surveys. Steel and pre-cast concrete dismantling eg complex steel framed, cantilevered, or post-tensioned structures; bridges, blocks of flats, offices. Industrial, conventional and specialist services. Crushing and soil screening to minimise removal and disposal, for cost and environment benefits.

Site investigation works, soil analysis reports, excavation, processing on site, removal and disposal off site for contaminated land. Handles general granular fill. Concrete resulting from demolition can be processed at recycling facilities some of this material may find its way back into the fabric of the new structure.

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