Results 61 to 70 of about 1,179,358 (368)

The Dual Origin of the Terrestrial Atmosphere

, 2003
The origin of the terrestrial atmosphere is one of the most puzzling enigmas in the planetary sciences. It is suggested here that two sources contributed to its formation, fractionated nebular gases and accreted cometary volatiles.
Abe, Anders, Ballentine, Balsiger, Bar-Nun, Bar-Nun, Benz, Bockelée-Morvan, Burnard, Busemann, Caffee, Chen, Chyba, Chyba, Dauphas, Dauphas, Dauphas, Dauphas, Dauphas, Dauphas, Delsemme, Delsemme, Eberhardt, Holland, Honda, Honda, Hunten, Hunten, Ihaka, Iro, Jagoutz, Kerridge, Kimura, Kleine, Kunz, Laufer, Marty, Marty, Marty, Maréchal, Mathew, Mathew, Matsui, Matsumoto, Mazor, Meier, Meisel, Meisel, Morbidelli, Moreira, Moreira, Nicolas Dauphas, Notesco, Notesco, Owen, Owen, Owen, Owen, Ozima, Ozima, Ozima, Pepin, Pepin, Pepin, Pepin, Pepin, Pepin, Podosek, Porcelli, Porcelli, Press, Sagan, Sarda, Sasaki, Schoenberg, Shoemaker, Swindle, Swindle, Tolstikhin, Trieloff, Walker, Wieler, Wieler, Yamamoto, Yin, Yokochi, Zahnle, Zahnle, Zahnle, Zahnle, Zahnle, Zhang   +91 more
core   +1 more source

Atomic Size Misfit for Electrocatalytic Small Molecule Activation

Advanced Functional Materials, EarlyView.
This review explores the application and mechanisms of atomic size misfit in catalysis for small molecule activation, focusing on how structural defects and electronic properties can effectively lower the energy barriers of chemical bonds in molecules like H2O, CO2, and N2.
Ping Hong, Changfan Xu, Huaping Zhao, Yong Lei   +3 more
wiley   +1 more source

NLTE spectroscopic analysis of the $^3$He anomaly in subluminous B-type stars

, 2018
Several B-type main-sequence stars show chemical peculiarities. A particularly striking class are the $^3$He stars, which exhibit a remarkable enrichment of $^3$He with respect to $^4$He.
Heber, U., Irrgang, A., Nieva, M. F., Przybilla, N., Schneider, D.   +4 more
core   +1 more source

The temperature and chronology of heavy-element synthesis in low-mass stars [PDF]

, 2015
Roughly half of the heavy elements (atomic mass greater than that of iron) are believed to be synthesized in the late evolutionary stages of stars with masses between 0.8 and 8 solar masses. Deep inside the star, nuclei (mainly iron) capture neutrons and
A Jorissen, A. Jorissen, B Gustafsson, B. Plez, CB Stephenson, DA Garcìa-Hernàndez, DL Lambert, E Biémont, E Vassiliadis, F Kupka, F Käppeler, F Käppeler, G Raskin, G Tagliente, G Wallerstein, GJ Mathews, K Takahashi, K-P Schröder, L Siess, L. Siess, M Asplund, MR Savina, O Straniero, O Trippella, P de Laverny, P. Neyskens, PW Merrill, R Alvarez, S Cristallo, S Goriely, S Goriely, S Van Eck, S Van Eck, S Van Eck, S Van Eck, S. Goriely, S. Van Eck, VV Smith, Y Kashiv, ZY Bao   +39 more
core   +1 more source

Copper‐based Materials for Photo and Electrocatalytic Process: Advancing Renewable Energy and Environmental Applications

Advanced Functional Materials, EarlyView.
Cu‐based catalysts as a cornerstone in advancing sustainable energy technologies are fully reviewed in this manuscript, highlighting their potential in photo‐ and electrocatalysis. It includes metallic copper, copper oxides, copper sulfides, copper halide perovskites, copper‐based metal–organic frameworks (MOFs), and covalent organic frameworks (COFs),
Jéssica C. de Almeida, Yanjie Wang, Thais A. Rodrigues, Paulo H. H. Nunes, Vagner R. de Mendonça, Paulo H. E. Falsetti, Leticia V. Savazi, Tao He, Alexandra V. Bardakova, Aida V. Rudakova, Jie Tian, Alexei V. Emeline, Osmando F. Lopes, Antonio Otavio T. Patrocínio, Jia Hong Pan, Caue Ribeiro, Detlef W. Bahnemann   +16 more
wiley   +1 more source

Elemental abundances and isotopic composition of Italian limestones: Glimpses into the evolution of the Tethys

Journal of Asian Earth Sciences: X, 2023
Biogenic limestones from three sections (north, central, and south) across peninsular Italy have been analysed for major and trace elements and Nd, Pb, and Sr isotopic ratios.
Gianluigi Rosatelli, Francesca Castorina, Ada Consalvo, Francesco Brozzetti, Domenico Ciavardelli, Maria Grazia Perna, Keith Bell, Simone Bello, Francesco Stoppa   +8 more
doaj   +1 more source

Nucleosynthesis of light element isotopes in evolved stars experiencing extended mixing

, 2009
We present computations of nucleosynthesis in red giants and asymptotic giant branch stars of Population I experiencing extended mixing. The assumed physical cause for mass transport is the buoyancy of magnetized structures, according to recent ...
Amari, Andrews, Angulo, Briand, Charbonnel, Charbonnel, Charbonnel, Charbonnel, Denissenkov, E. Maiorca, Guandalini, Käppeler, M. Busso, Nittler, Palacios, R. Guandalini, S. Palmerini, Straniero, Wallerstein, Wasserburg, Švanda   +20 more
core   +1 more source

Trace element and isotope constraints on crustal anatexis by upwelling mantle melts in the North Atlantic Igneous Province: an example form the Isle of Rum, NW Scotland [PDF]

, 2009
Sr and Nd isotope ratios, together with lithophile trace elements, have been measured in a representative set of igneous rocks and Lewisian gneisses from the Isle of Rum in order to unravel the petrogenesis of the felsic rocks that erupted in the early ...
Ellam, R.M., Emeleus, C.H., Hertogen, J., Meyer, R., Nicoll, G.R., Troll, V.R.   +5 more
core   +1 more source

Europium Isotopic Abundances in Very Metal Poor Stars [PDF]

, 2002
Europium isotopic abundance fractions are reported for the very metal poor, neutron-capture-rich giant stars CS 22892-052, HD 115444, and BD +17°3248.
C. Sneden, J. Cowan, J. Lawler, S. Burles, T. Beers, G. Fuller   +5 more
semanticscholar   +1 more source

Copper Doping Enhances the Activity and Selectivity of Atomically Precise Ag44 Nanoclusters for Photocatalytic CO2 Reduction

Advanced Functional Materials, EarlyView.
By a simple anti‐Galvanic reaction, up to six copper atoms could be preferably doped into the Ag2(SR)5 staple motifs and Ag20 dodecahedral shell of an atomically precise Ag44(SR)30 nanocluster. When anatase TiO2 is used as substrate, the (AgCu)44/TiO2 photocatalyst exhibited much improved activity in photocatalytic CO2 reduction compared to Ag44/TiO2 ...
Ye Liu, Xi Zheng, Xiufan Liu, Tengyuan Gao, Nicola Pinna, Yu Wang   +5 more
wiley   +1 more source