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The newly-amalgamated, JSG Radiogenic Isotope Facility, includes a thermal ionization mass spectrometer TIMS and new multicollector inductively coupled plasma mass spectrometer MC-ICP-MS and nm laser, two clean labs for sample dissolution and isolation of elements of interest and two prep labs for cutting, crushing or microdrilling samples and picking mineral grains. We have a host of well-established analytical capabilities Sr, Nd, Pb, Hf and Os isotopes in waters, carbonates and silicates but we are poised to develop new techniques and adapt procedures for new applications.
In this talk I will present an example where we adapt U-Th dating procedures, commonly applied to speleothems and coral, to generate reliable ages in ancient ostrich eggshell OES found in an early human archeological site by Dr. At the request of other JSG scientists, we are establishing analytical techniques for analysis of Li isotopes in carbonates, silicates and waters, Rb-Sr dating of high pressure metamorphic rocks, Sm-Nd dating of fluorite-rich veins, U isotopes in marine carbonates and zircon Hf isotopes by laser ablation.
We welcome the challenge to develop new capabilities to enhance JSG research goals.
, from a mixture of 30 parts of tion of wireless telegraphy apparatus for experimental aluminium and 70 parts of magnesium ; AlMg, sp. gr. , purposes.
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Jinning Al-Mg Cuts 100 ktpy Al Capacity
The Mg isotopic compositions of eight Ca-Al-rich inclusions from the Allende meteorite have been measured with an ion microprobe.
Hawaii, M. Wadhwa, Arizona State Uni, Q. Yin, Uni. California Davis, and A. Irving, Uni. Washington Recent discoveries in cosmochemistry overturned the previously accepted image of the solar system formation by gradual cooling of a molecular cloud, and sequential condensation of ever larger lumps of matter: mineral grains, chondrules, planetesimals, and finally planets. Instead, it is seen as a complex assembly of hot and cold domains, differentiating small planets and pristine dust, that coexisted and interacted for a short period of less than 10 million years.
Understanding the nature of their interaction is impossible without accurate knowledge of the sequence and duration of the early Solar System processes. The time markers for these events are provided by abundances of the decay products of short-lived now extinct isotopes 26 Al, 53 Mn, W and the others, and by accumulation of radiogenic Pb isotopes from decay of U and Th. Precise dating of the early Solar System materials is extremely demanding analytically, because of low concentrations of the parent and daughter elements, the need to analyse individual mineral grains or their parts to get interpretable results from complex and heterogeneous meteorites, and limited quantities of the best preserved meteorites available for research.
Diagonal lines indicate consistent age intervals measured with each pair of chronometers.
Understanding the Origins of Intergranular Corrosion in Copper-Containing Al-Mg-Si Alloys
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The invention relates to a weldable, corrosion-resistant high-magnesium aluminum um magnesium alloy, which is an essential component of a ternary aluminum Contains scandium-zirconium phase. Such an alloy is for example from the US 5,, and is known for its low density, high strength and corrosion Continuity of interest especially for applications in aviation By adding elements rare earths or elements similar to rare earths are used in aluminum Magnesium alloy produces dispersoids, which according to the above.
US patent a higher strength Produce speed and corrosion resistance. With regard to the weldability of such Alloy can be the above. No information can be found in US patent. The object of the present invention is a weldable, corrosion-resistant high magne to create sium-containing aluminum-magnesium alloy, which in terms of strength and Corrosion behavior of the known alloy is at least not inferior and in addition to one good weldability, has a high recrystallization threshold.
This task is accomplished by solved an aluminum-magnesium alloy according to claim 1. This new alloy has a significantly lower level than the known alloy manganese, surprisingly an improved corrosion resistance resistance, especially in the sensitized state of the parts made from this alloy, for example, if cold-formed parts are exposed to an elevated temperature for a long period of time be set.
It is believed that these positive properties are mainly due to the ver ratio of manganese to scandium. Also that in contrast to the known alloy Titanium content contributes to strength, in addition to its effect as a grain refining agent increase since titanium can replace the zirconium in the ternary Al-Sc-Zr phase, the However, the solubility of titanium is lower than that of zirconium.
Al-Zn phase decreases. The respective con the upper limits of the concentration are chosen so that the Cu above all does not affect the weldability and the Zn does not affect corrosion resistance.
Understanding the Origins of Intergranular Corrosion in Copper-Containing Al-Mg-Si Alloys
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system chronology is a subject of much debate (c.f. Bollard et al., ; Mg deficit dating of small grains, such as that pictured in Fig 2, and.
The present invention relates to an Al-Mg-Si aluminum alloy for casting having excellent proof stress, and a cast member comprising the same. Aluminum alloy cast members, which are advantageous in terms of weight reduction, ease of processing of complex shapes, and reduction of manufacturing costs, are widely used for various parts. In particular, automobiles and the like are required to save energy and improve fuel efficiency, and further weight reduction and high quality are desired for cast aluminum alloy members.
Parts that make up the body of an automobile that should be strong need a proof stress of about MPa or more. It is known that the proof stress of a metal material such as an aluminum alloy improves as the crystal grains become smaller. One of the factors affecting the crystal grain size is the solidification rate. When the solidification rate is increased, the crystal grains become smaller and the yield strength is improved. In order to increase the solidification rate in order to improve the yield strength, it is conceivable to adopt a die casting method in which the cast member is thinned and molded at a higher speed than the low pressure casting method or the gravity casting method.
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N2 – We present high-precision Mg isotope data for most classes of basaltic meteorites including eucrites, mesosiderite silicate clasts, angrites and the ungrouped Northwest Africa NWA measured by pseudo-high-resolution multiple-collector inductively coupled plasma mass spectrometry and utilising improved techniques for chemical purification of Mg. This discrepancy might indicate that 26 Al was markedly lower ca.
AB – We present high-precision Mg isotope data for most classes of basaltic meteorites including eucrites, mesosiderite silicate clasts, angrites and the ungrouped Northwest Africa NWA measured by pseudo-high-resolution multiple-collector inductively coupled plasma mass spectrometry and utilising improved techniques for chemical purification of Mg. Forskning Forskere og publikationer Resultat.
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Cirrhosis is a major cause of morbidity and mortality worldwide with liver transplantations as it only possible cure. In the face of a significant organ shortage many patients die waiting. A major complication of cirrhosis is the development of portal hypertension and ascites. The management of ascites has barely evolved over the last hundred years and includes only a few milestones in our treatment approach, but has overall significantly improved patient morbidity and survival.
A weldable anti-corrosive aluminium-magnesium alloy containing a high amount zinc (Zn) in addition to aluminium (Al) and unavoidable impurities with a maximum of wt. Publication number Priority date Publication date Assignee Title.
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EP1682688A1 – Al-mg-si-aluminium-gusslegierung mit scandium – Google Patents
Jump to content. This medicine can make it harder for your body to absorb other medicines, especially certain antibiotics. Avoid taking any other medicine within 2 hours before or 2 hours after you take aluminum hydroxide, magnesium hydroxide, and simethicone.
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Historically, photometry has been largely used to identify stellar populations [multiple populations MPs ] in globular clusters GCs by using diagrams that are based on colours and magnitudes that are mostly sensitive to stars with different metallicities or different abundances of helium, carbon, nitrogen, and oxygen. We introduce a new ChM whose abscissa and ordinate are mostly sensitive to stellar populations with different magnesium and nitrogen, respectively, in monometallic GCs.
This ChM is effective in disentangling the MPs based on their Mg chemical abundances, allowing us to explore, for the first time, possible relations between the production of these elemental species for large samples of stars in GCs. Most users should sign in with their email address. If you originally registered with a username please use that to sign in. To purchase short term access, please sign in to your Oxford Academic account above.
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