搜索结果: 1-15 共查到“理学 strontium”相关记录24条 . 查询时间(0.08 秒)
JILA strontium atomic clock sets new records in both precision and stability（图）
strontium atomic clock lasers
2014/1/22
Heralding a new age of terrific timekeeping, a research group at JILA—a joint institute of the University of Colorado Boulder and the National Institute of Standards and Technology—has unveiled an exp...
Lithium–strontium isotope and heavy metal content of fluid inclusions and origin of ore-forming fluid responsible for tungsten mineralization at Takatori mine, Japan
fluid inclusion lithium isotope initial 87Sr/86Sr ratio Takatori mine tungsten mineralization
2013/4/11
Ore-forming fluid trapped in vein quartz as fluid inclusions from tungsten ore at the Takatori mine was extracted by a
crush-leach technique. The trace metal content and isotopic composition (δ7Li an...
An extremely peculiar hot subdwarf with a ten-thousand-fold excess of zirconium, yttrium, and strontium
hot subdwarf ten-thousand-fold
2010/11/30
Helium-rich subdwarf B (He-sdB) stars represent a small group of low-mass hot stars with luminosities greater than those of conventional subdwarf B stars, and effective temperatures lower than those o...
Tackling the blackbody shift in a strontium optical lattice clock
blackbody shift strontium optical lattice clock
2010/10/26
A major obstacle for optical clocks is the frequency shift due to black body radiation. We discuss how one can tackle this problem in an optical lattice clock; in our case 87Sr: firstly, by a measurem...
Sedimentation of acantharian cysts in the Iceland Basin: Strontium as a ballast for deep ocean particle flux, and implications for acantharian reproductive strategies
acantharian cysts a ballast for deep ocean particl
2010/4/16
Acantharian cysts were discovered in sediment trap samples from spring 2007 at 2000 m in the Iceland Basin.
Although these single-celled organisms contribute to particulate organic matter flux in the...
Photo finish in race for strontium condensate（图）
Photo finish strontium condensate strontium atoms
2009/11/18
An Austrian group has beaten its US counterpart by a matter of days in a race to create a Bose-Einstein condensate (BEC) of strontium atoms.Researchers at the Institute of Quantum Optics and Informati...
Calcium Budgets for Catchments as Interpreted by Strontium Isotopes
Calcium Budgets Catchments Strontium Isotopes
2009/10/27
Strontium isotopes in precipitation, soil and runoff water can be used to establish
a ratio of wet plus dry deposited Sr to Sr released by weathering. This ratio
is especially enhanced in areas with...
A normalised seawater strontium isotope curve and the Neoproterozoic-Cambrian chemical weathering event
normalised seawater strontium isotope curve chemical weathering event
2009/10/22
The strontium isotope composition of seawater has varied over geological time in response to changes in the rates of continental weathering relative to ocean crust alteration. However, the potential o...
Strontium Isotopic and Micropalaeontological Dating Used to Help Redefine the Stratigraphy of the Neotectonic Hatay Graben, Southern Turkey
Cenozoic stratigraphy strontium isotopes micropalaeontology Hatay Graben Karasu Rift Dead Sea Fault Zone Eastern Mediterranean
2009/7/7
In this paper we report for the Hatay Graben, new micropalaeotology, the first strontium dating and new sedimentology. The previous lack of a modern systematic stratigraphy was problematic for the st...
Strontium isotopic record of signatures of Holocene fluvial sediments in the Loire valley, France
River Loire Holocene fluvial dynamics geochemistry strontium isotopes
2009/3/17
The distribution of Sr contents and isotopes of strontium Sr in the labile fraction of sediments from a channel fillings infill in the Middle Loire alluvial plain is used to highlight aspects of the e...
Strontium isotope geochemistry of alluvial groundwater: a tracer for groundwater resources characterisation
Loire river major and trace elements
2009/3/6
This study presents strontium isotope and major ion data of shallow groundwater and river water from the Ile du Chambon catchment, located on the Allier river in the Massif Central (France).
EVALUATION OF ASTROPHYSICALLY USEFUL PARAMETERS FOR STRONTIUM MONOHYDRIDE AND DEUTERIDE
Molecular data-Methods numerical-Sun abundances
2009/2/19
The Franck-Condon factors and r-centroids which are very closely
related to transition probabilities, have been evaluated by the more reliable nu-
merical integration procedure for the band systems ...
High Yielding Oxidative Deprotection of Silyl and Pyranyl Ethers to Their Corresponding Carbonyl Compounds with Strontium Manganate in the Presence of Aluminium Chloride in Solution and Under Solvent-Free Conditions
Strontium manganate aluminium chloride solvent-free conditions oxidative deprotection tetrahydropyranyl ethers
2008/12/30
Strontium manganate (SrMnO4) in the presence of aluminium chloride (AlCl3) is an efficient reagent for the high yielding oxidative deprotection of aromatic and aliphatic silyl and pyranyl ethers into ...
Strontium isotopic and elemental characteristics of calcites in the eolian dust profile of the Chinese Loess Plateau during the past 7 Ma
Chinese Loess Plateau the eolian dust profile strontium isotope of calcite chemical weathering the East Asian summer monsoon
2008/8/10
Strontium isotopic ratios, calcium and strontium contents of calcites in the eolian dust profile during the last 7 Ma at Lingtai were systematically studied. 87Sr/86Sr ratios of calcites change with t...
Energy transfer and red phosphorescence in strontium aluminates co-doped with Cr3+, Eu2+ and Dy3+
Cr3+ Persistent phosphors Energy transfer Strontium aluminates Eu2+
2008/1/9
Cr3+ activated red long persistent phosphorescence through persistence energy transfer from Eu2+ to Cr3+ has been reported in strontium aluminates co-doped with Cr3+, Eu2+ and Dy3+. The decay processe...