Results 41 to 50 of about 37,639 (216)

The Apollo 15 coarse fines (4-10 mm) [PDF]

, 1989
A new catalog of the Apollo 15 coarse fines particles is presented. Powell's macroscopic descriptions, resulting from his 1972 particle by particle binocular examination of all of the Apollo 15 4 to 10 mm fines samples, are retained.
Ryder, Graham, Sherman, Sarah Bean
core   +1 more source

Research progress and current status of dynamic wave propagation characteristics in rock mass: A review

Deep Underground Science and Engineering, EarlyView.
This review elucidates the velocity–dispersion–attenuation coupling mechanisms of wave propagation in rock masses, compares six representative models, and reveals how pressure, temperature, mineral composition, and anisotropy jointly control dynamic responses in complex geological media.
Jiajun Shu, Tao Li, Ruiqi Yuan, Yue Li, Bingni Wu, Bo Liu, Zhengding Deng, Galindo Rubén, Fausto Molina‐Gómez   +8 more
wiley   +1 more source

Composition of Near-Earth Asteroid (4179) Toutatis

, 2012
Surface composition of near-Earth asteroid (4179) Toutatis is consistent with an undifferentiated L-chondrite composition. This is inconsistent with early observations that suggested high pyroxene iron content and a differentiated body.Comment: 15 pages,
Abell, Paul, Corre, Lucille Le, Gaffey, Michael, Hardersen, Paul, Reddy, Vishnu, Sanchez, Juan Andreas   +5 more
core   +1 more source

Geochemical and Geological Investigation of Skarn‐Type Pb–Zn Mineralization in Hastanetepe (Balya‐Balıkesir, Türkiye): An Approach Based on Fluid Inclusions, Sulphur Isotopes and Geochemical Data

Geological Journal, EarlyView.
Integrated petrographic, mineralogical and geochemical data from the Hastanetepe Pb–Zn deposit (Balya, Türkiye) reveal multi‐stage hydrothermal alteration and a magmatic sulphur source. Fluid inclusion and sulphur isotope results indicate a complex fluid evolution responsible for skarn‐type Pb–Zn mineralization along limestone–dacite contacts ...
Esra Ünal‐Çakır
wiley   +1 more source

Silica-Rich Bright Debris Disk around HD 15407A

, 2012
We report an intriguing debris disk towards the F3V star HD 15407A, in which an extremely large amount of warm fine dust (~ 10^(-7) M_Earth) is detected. The dust temperature is derived as ~ 500-600 K and the location of the debris dust is estimated as 0.
Bohren, Dorschner, Fabian, Fujiwara, Hammel, Holman, Houck, Ishiguro, Kemper, Kenyon, Koike, Lisse, Melis, Mikouchi, Murakami, Onaka, Oudmaijer, Rhee, Sargent, Takeda, van Leeuwen, Wyatt   +21 more
core   +1 more source

The mineralogy, petrology, and composition of anomalous eucrite Emmaville [PDF]

, 2017
The Emmaville eucrite is a relatively poorly studied basaltic achondrite with an anomalous oxygen isotope signature. In this study, we report comprehensive mineralogical, petrographic, and geochemical data from Emmaville in order to understand its ...
Barrat, Barrat, Bland, Bogard, Bunch, Clayton, Cleverly, Eggins, Floss, Ghosh, Greenwood, Greenwood, Greenwood, Greenwood, Janots, Lodders, Mandler, Mason, Mayne, McSween, Metzler, Miller, Miller, Mittlefehldt, Mittlefehldt, Mittlefehldt, Morgan, Nyquist, Palme, Papike, Qin, Righter, Rogers, Scott, Spivak-Birndorf, Starkey, Stolper, Takeda, Takeda, Trinquier, Warren, Wasson, Weisberg, Wiechert, Yamaguchi, Yamaguchi, Yamaguchi, Yamaguchi   +47 more
core   +1 more source

Eliminating disorderly A sites: Significantly enhanced external quantum efficiency of Bi3+ luminescence in double perovskite phosphor

InfoMat, EarlyView.
The structural transformation from disorder to order was achieved by regulating the A‐site of double perovskite, boosting IQE and EQE to 78% and 43%, respectively. The excellent luminescence properties of the representative CYNO:1%Bi3+ phosphor highlight the multifunctional application potential in solid‐state lighting, fingerprint recognition, and ...
Rui Wang, Asif Ali Haider, Hongzhi Zhang, Haonan Cui, Yiting Huang, Yuyao Fu, Zizhuo Yao, Shuangbao Wang, Jiyang Xie, Hong Li, Zhi Xie, Jing Zhu   +11 more
wiley   +1 more source

High Strength Pyroxene-Based Glass- Ceramic Foams in the Presence of Fe2O3

Iranian Journal of Materials Science and Engineering, 2020
Strong glass-ceramic foams with a compressive strength of 20 MPa were prepared by adding various amounts of Fe2O3 to a soda lime-based glass composition, and SiC as a foaming agent.
P. Shahsavari, B. Eftekhari Yekta, V. Marghussian   +2 more
doaj  

A ramsayite-type oxide, Ca2Sn2Al2O9

Acta Crystallographica Section E, 2010
The title compound, dicalcium nonaoxidodistannate(IV)dialuminate, is the second example which crystallizes in the isotypic structure of a pyroxene silicate, Na2Ti2Si2O9 (ramsayite).
Rong Tu, Takashi Goto, Shunsuke Abe, Hisanori Yamane   +3 more
doaj   +1 more source

Geochemical evolution of the Nyiragongo volcano (Virunga, Western African Rift, Zaire) [PDF]

Bulletin of the Geological Society of Finland, 1985
Strongly undersaturated foiditic lavas (nepheline—melilitites, nephelinites, leucitites) from the active Nyiragongo volcano have been analysed for trace elements (Sc, V, Cr, Co, Ba, REE, Hf, Ta, Th and U) by instrumental neutron activation analysis.
J. Hertogen, L. Vanlerberghe, M.R. Namegabe   +2 more
doaj   +1 more source