搜索结果: 1-15 共查到“理学 Abundances”相关记录45条 . 查询时间(0.076 秒)
Abundances of rare earth elements in crude oils and their partitions in water
rare earth elements crude oil partition coefficient NMR Junggar Basin
font style='font-size:12px;'>
2017/8/9
Patterns of the entire range of REE in crude oils and coexisting water, collected from mud volcanoes in Xinjiang Province of China, are reported here for the first time. Crude oils show light REE enri...
Occurrences, abundances, and compositional variations of cosmic symplectites in the Acfer 094 ungrouped carbonaceous chondrite
cosmic symplectite magnetite Fe,Ni-sulfides Acfer 094 carbonaceous chondrite
font style='font-size:12px;'>
2017/4/10
We describe the petrographic occurrences, abundances, and compositional variations of symplectically intergrown
Fe,Ni-sulfides and 17,18O-rich magnetite (D17O ~ 90‰), named cosmic symplectites (COS; ...
Presolar silicate grains: Abundances, isotopic and elemental compositions, and the effects of secondary processing
presolar grains silicates nucleosynthesis isotopes AGB stars
font style='font-size:12px;'>
2017/4/10
Close to a thousand presolar silicate grains have been identified since their initial discovery in interplanetary dust
particles (IDPs) just over ten years ago. Studies have shown that silicates are ...
Growth Kinetics and Constraints Related to Metabolic Diversity and Abundances of Hyperthermophiles in Deep-Sea Hydrothermal Vents
Archaea Biogeography Growth Kinetics Hyperthermophiles Iron Reduction Methanogenesis
font style='font-size:12px;'>
2015/1/28
This dissertation research aims to show that there are deterministic microbial distribution patterns based on quantifiable environmental thresholds by determining and rationalizing the relative abunda...
X-Ray Absorption Spectroscopy of the Multiphase Interstellar Medium: Oxygen and Neon Abundances
ISM 4U 1820–303
font style='font-size:12px;'>
2014/12/24
X-ray absorption spectroscopy provides a powerful tool in determining the metal abundances in various phases of the interstellar medium (ISM). We present a case study of the sight line toward 4U 1820-...
OPTICAL SPECTROSCOPY AND NEBULAR OXYGEN ABUNDANCES OF THE SPITZER/SINGS GALAXIES
galaxy star formation
font style='font-size:12px;'>
2014/12/22
We present intermediate-resolution optical spectrophotometry of 65 galaxies obtained in support of the Spitzer Infrared Nearby Galaxies Survey (SINGS). For each galaxy we obtain a nuclear, circumnucle...
Abundances of PNe in the Outer Disk of M31
Abundances PNe Outer Disk M31
font style='font-size:12px;'>
2012/2/23
We present spectroscopic observations and chemical abundances of 16 planetary nebulae (PNe) in the outer disk of M31. The [O III] 4363 line is detected in all objects, allowing a direct measurement of...
MINERALOGICAL ABUNDANCES AS DETERMINED BY X-RAY DIFFRACTION IN SELECT SAMPLES OF THE UPPER FLORIDA AQUIFER
MINERALOGICAL ABUNDANCES X-RAY DIFFRACTION FLORIDA AQUIFER
font style='font-size:12px;'>
2011/11/11
Analysis of 53 bulk powders derived from various rocks of the Upper Floridan Aquifer reveal calcite, dolomite/ankerite, quartz, apatite, and smectite to be the dominant minerals, with the clay and apa...
Detailed Chemical Abundances of Four Stars in the Unusual Globular Cluster, Palomar 1
Detailed Chemical Abundance Unusual Globular Cluster Palomar
font style='font-size:12px;'>
2011/10/17
Detailed chemical abundances for twenty one elements are presented for four red giants in the anomalous outer halo globular cluster Palomar 1 ($R_{\rm{GC}} = 17.2$ kpc, $Z=3.6$ kpc) using high-resolut...
Abundances in planetary nebulae: NGC1535, NGC6629, He2-108, and Tc1
ISM: abundances – planetary nebulae: individual: NGC1535 & Tc 1 (& IC1266) & NGC6629 & He2-108 – Infrared: ISM: lines and bands
font style='font-size:12px;'>
2011/10/12
The aim of the paper is to determine abundances in a group of PNe with uniform morphology. The PNe discussed are circular excited by rather low-temperature central stars. The relation between abundanc...
Galactic abundances as a relic neutrino detection scheme
Galactic abundances relic neutrino detection scheme
font style='font-size:12px;'>
2011/10/11
We propose to use the threshold-free process of neutrino capture on beta-decaying nuclei (NCB) using all available candidate nuclei in the Milky Way as target material in order to detect the presence ...
CNO and F abundances in the barium star HD 123396
stars: individual (HD123396: HIP 69834) – stars: abundances – stars: atmospheres – stars: barium
font style='font-size:12px;'>
2011/10/10
Barium stars are moderately rare, chemically peculiar objects, which are believed to be the result of the pollution of an otherwise normal star by material from an evolved companion on the asymptotic ...
Detailed Abundances of the Solar Twins 16 Cygni A and B: Constraining Planet Formation Models
Detailed Abundances Solar Twins Constraining Planet Formation Models
font style='font-size:12px;'>
2011/10/10
Results of a detailed abundance analysis of the solar twins 16 Cyg A and 16 Cyg B based on high-resolution, high signal-to-noise ratio echelle spectroscopy are presented. 16 Cyg B is known to host a g...
Chemical abundances in the protoplanetary disk LV2 (Orion) - II: High dispersion VLT observations and microjet properties
ISM – abundances HII regions ISM:stars: pre-main-sequence protostars protoplan- etary disks
font style='font-size:12px;'>
2011/9/29
Integral field spectroscopy of the LV2 proplyd is presented taken with the VLT/FLAMES Argus array at an angular resolution of 0.31x0.31 arcsec^2 and velocity resolutions down to 2 km/s per pixel. Foll...
The Stellar Abundances for Galactic Archaeology (SAGA) Database II - Implications for Mixing and Nucleosynthesis in Extremely Metal-Poor Stars and Chemical Enrichment of the Galaxy
The Stellar Abundances for Galactic Archaeology Database II
font style='font-size:12px;'>
2011/1/13
We discuss the characteristics of known extremely metal-poor (EMP) stars in the Galaxy using the Stellar Abundances for Galactic Archaeology (SAGA) database (Suda et al. 2008, PASJ, 60, 1159).The anal...