Results 71 to 80 of about 85,610 (304)

Fluid evolution in CM carbonaceous chondrites tracked through the oxygen isotopic compositions of carbonates [PDF]

, 2017
The oxygen isotopic compositions of calcite grains in four CM carbonaceous chondrites have been determined by NanoSIMS, and results reveal that aqueous solutions evolved in a similar manner between parent body regions with different intensities of ...
Alexander, Alexander, Barber, Benedix, Bland, Bonal, Bunch, Burbine, Clark, Clayton, Clayton, de Leuw, DuFresne, Emery, Fujiya, Fujiya, Guo, Hewins, Horita, Howard, I.A. Franchi, Jenniskens, Johnson, Kasuga, Lauretta, Lee, Lee, Lee, Lee, Lee, Lee, Lindgren, Lindgren, M.R. Lee, Marrocchi, McSween, McSween, N.A. Starkey, P. Lindgren, Palguta, Rubin, Rubin, Starkey, Tomeoka, Tyra, Tyra, Tyra, Velbel, Young, Young   +49 more
core   +2 more sources

Effects of motor and cognitive‐motor training on cognitive performance in healthy older adults

Journal of Neuropsychology, EarlyView.
Abstract With a rapidly aging global population, identifying effective strategies to preserve cognitive health and functional independence is increasingly important. This study investigated the effects of motor and combined cognitive‐motor training on cognitive performance and well‐being in healthy older adults against a control condition. Participants
Silvia Gobbo, Elisa Galli, Daniele Romano   +2 more
wiley   +1 more source

Quantitative FT-IR Analysis for Chondritic Meteorites: Search for C_60 in Meteorites [PDF]

Journal of Astronomy and Space Sciences, 1998
Infrared absorption spectra of 9 bulk samples and 3 acid residues of meteorites were obtained in the mid-infrared region (4000 ~ 400 cm^(-1)). From the known composition of meteorites studied, the possible absorption modes were investigated.
Chunglee Kim, Jongmann Yang
doaj  

60Fe-60Ni chronology of core formation in Mars

, 2014
The timescales of accretion, core formation, and magmatic differentiation in planetary bodies can be constrained using extinct radionuclide systems. Experiments have shown that Ni becomes more siderophile with decreasing pressure, which is reflected in ...
Dauphas, Nicolas, Tang, Haolan
core   +1 more source

The Spiral Structure of the Milky Way, Cosmic Rays, and Ice Age Epochs on Earth [PDF]

, 2002
The short term variability of the Galactic cosmic ray flux (CRF) reaching Earth has been previously associated with variations in the global low altitude cloud cover. This CRF variability arises from changes in the solar wind strength.
Alvarez, Amaral, Avedisova, Barry, Bazilevskaya, Beer, Begelman, Bell, Berezinskiı̆, Binney, Blitz, Christensen-Dalsgaard, Comeron, Compton, Creze, Dame, Dickinson, Dilke, Dopita, Dragicevich, Efremov, Egorova, Elmegreen, Feitzinger, Fernández, Frakes, Friis-Christensen, Gallagher, Gardiner, Georgelin, Gordon, Grivnev, Grivnev, Guyodo, Haigh, Hambrey, Hampel, Harrison, Hernandez, Heyer, Hodell, Hoffman, Hoyle, Hoyle, Huber, Ivanov, Kirkby, Labitzke, Lavielle, Leitch, Lin, Lisenfeld, Lo, Loktin, Longair, Lukasiak, Lynds, Marsh, Michel, Mishurov, Mishurov, Napier, Neff, Nelson, Ney, Nir J. Shaviv, Olling, Palle Bago, Palous, Perko, Pudovkin, Rind, Robin, Rocha-Pinto, Rocha-Pinto, Ruphy, Schaeffer, Shaviv, Simpson, Singer, Soon, Soon, Steiner, Stozhkov, Svensmark, Svensmark, Tammann, Taylor, Tinsley, Vallenari, Vallée, Vallée, van den Bergh, Veizer, Voshage, Voshage, Voshage, Webber, Westerlund, Wiedenbeck, Wielen, Wielen, Williams, Yabushita, Yuan, Yuan, Zachos   +106 more
core   +2 more sources

New knowledge about shock events that affected the L‐chondrite parent body from two heavily shocked L6 meteorite finds

Meteoritics &Planetary Science, EarlyView.
Abstract We report new results from a study of shock‐related features in the L6 ordinary chondrites Northwest Africa (NWA) 4672 and NWA 12841. Our observations confirm the occurrence of eight high‐pressure (HP) minerals in each meteorite, namely, ringwoodite, majorite, akimotoite, wadsleyite, albitic jadeite, lingunite, tuite, and xieite.
I. Baziotis, L. Ferrière, C. Ma, J. Hu, D. Palles, P. D. Asimow   +5 more
wiley   +1 more source

A Portable Magnetometer for Magnetic Measurements of Meter‐Sized Meteorites

Geochemistry, Geophysics, Geosystems, 2020
Meteorites contain records of past magnetic fields in the form of natural remanent magnetization (NRM). A key property of meteorite magnetization that provides information about its origin is its dependence on spatial scale.
Elise Clavé, Clara Maurel, Eduardo A. Lima, Jay Shah, Elias N. Mansbach, Minoru Uehara, Benjamin P. Weiss   +6 more
doaj   +1 more source

Bunburra Rockhole: Exploring the geology of a new differentiated asteroid [PDF]

, 2017
Bunburra Rockhole is the first recovered meteorite of the Desert Fireball Network. We expanded a bulk chemical study of the Bunburra Rockhole meteorite to include major, minor and trace element analyses, as well as oxygen and chromium isotopes, in ...
Benedix, G.K., Bevan, A.W.R., Bland, P.A., Franchi, I.A., Friedrich, J.M., Greenwood, R.C., Mertzman, S.A., Mittlefehldt, D.W., Perrotta, G.C., Sanborn, M.E., Towner, M.C., Yin, Q.-Z.   +11 more
core   +1 more source

Noble gases and nitrogen in material from asteroid Bennu

Meteoritics &Planetary Science, EarlyView.
Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty, L. Zimmermann, E. Füri, D. V. Bekaert, J. J. Barnes, A. N. Nguyen, H. C. Connolly, D. S. Lauretta   +7 more
wiley   +1 more source

The stellar origins of 96Zr excesses in presolar graphites from the Murchison meteorite

Astronomy & Astrophysics
Context. Zirconium-96 is a stable isotope that can be synthesized under different neutron-rich nucleosynthetic conditions. Astrophysical models predict its production to occur in various stellar environments: from low-to-intermediate-mass asymptotic ...
Pal I., Jadhav M., Shulaker D. Z., Raiwa M., Savina M. R., Bouillion H., Pignatari M., Roberti L., Lugaro M., Szányi B., Karakas A., Denissenkov P., Herwig F., Dory C. J., Gyngard F., Kita N., Amari S.   +16 more
doaj   +1 more source