Results 51 to 60 of about 50,831 (210)

Chelating Coordination Regulates Perovskite Crystallization and Defect Passivation in Sn–Pb Perovskite Solar Cells

Small, EarlyView.
A chelating coordination strategy using ethylenediamine diacetate (EDDA) is introduced to regulate crystallization and passivate defects in Sn–Pb perovskite solar cells. Interfacial coordination at both buried and top surfaces suppresses Sn2+ oxidation, reduces defects, and enhances charge extraction, enabling over 23% efficiency with improved voltage,
Md. Abdul Karim, Shamim Ahmmed, Siliang Cao, Md. Emrul Kayesh, Yulu He, Md. Ataur Rahman, Wasif Islam Chowdhury, Masatoshi Yanagida, Yasuhiro Shirai, Ashraful Islam   +9 more
wiley   +1 more source

Black hole variability and the star formation-active galactic nucleus connection : do all star-forming galaxies host an active galactic nucleus? [PDF]

, 2014
We investigate the effect of active galactic nucleus (AGN) variability on the observed connection between star formation and black hole accretion in extragalactic surveys.
Alexander, D.M., Chen, C.-T.J., Civano, F.M., Goulding, A.D., Hainline, K.N., Hickox, R.C., Mullaney, J.R.   +6 more
core   +2 more sources

Variation in food availability affects the population age structure of Atlantic puffins Fratercula arctica in the Faroe Islands

Wildlife Biology, EarlyView.
Across their entire Atlantic breeding range, Atlantic puffins Fratercula arctica have experienced decreases in food availability, often leading to population declines. The species is one of the most numerous seabirds in Føroyar (the Faroe Islands, in English) but has faced apparent, unquantified population declines.
Anne N.M.A. Ausems, Dariusz Jakubas, Jens–Kjeld Jensen, Katarzyna Wojczulanis–Jakubas   +3 more
wiley   +1 more source

Emission Reporting for Agriculture: Frameworks and Metrics Matter

Australian Journal of Agricultural and Resource Economics, EarlyView.
ABSTRACT Frameworks and metrics that reliably describe agricultural emission sources and carbon sinks are critical to the formulation of cost‐effective mitigation investment. This study identifies and compares three distinct emission reporting frameworks across metrics of total emissions and emissions intensity.
Johnny Machon, Christophe d'Abbadie, Ross Kingwell   +2 more
wiley   +1 more source

SMBH Seeds: Model Discrimination with High Energy Emission Based on Scaling Relation Evolution

, 2017
We explore the expected X-ray (0.5-2keV) signatures from super massive black holes (SMBHs) at high redshifts ($z\sim5-12$) assuming various models for their seeding mechanism and evolution.
Ben-Ami, Sagi, Loeb, Abraham, Vikhlinin, Alexey   +2 more
core   +1 more source

TrkB signaling is required for postnatal survival of CNS neurons and protects hippocampal and motor neurons from axotomy-induced cell death [PDF]

, 1997
Newborn mice carrying targeted mutations in genes encoding neurotrophins or their signaling Trk receptors display severe neuronal deficits in the peripheral nervous system but not in the CNS. In this study, we show that trkB (¿/¿) mice have a significant
Alcántara Horrillo, Soledad, Barbacid, Mariano, Frisén, Jonás, Río Fernández, José Antonio del, Silos-Santiago, Inmaculada, Soriano García, Eduardo   +5 more
core   +1 more source

Wari Lithic Technology on the Northern Coast of the Andes: Geochemical, 2D Geometric Morphometric, and Technological Analyses of Obsidian Bifaces From San José de Moro

Archaeometry, EarlyView.
ABSTRACT This study examines Wari obsidian production in a cache of 39 bifaces found at the Late Moche site of San José de Moro (Jequetepeque Valley, North Coast of Peru, 700–850 ad). Portable X‐ray fluorescence, geometric morphometric, and technological analyses were used to investigate raw material provenance and bifacial production.
Antonio Pérez‐Balarezo, Luis Jaime Castillo, Jalh Dulanto   +2 more
wiley   +1 more source

A primary survey of aphid species on almond and peach, and natural enemies of Brachycaudus amygdalinus in As-Sweida, Southern Syria [PDF]

, 2008
Syria is one of the biggest almond producer country in the world. Few arthropdes that live on almond are consider as pests. Aphids are one of the major pests their.
Almatni, W., Khalil, N.
core  

Intercomparison of spectroradiometers and Sun photometers for the determination of the aerosol optical depth during the VELETA-2002 field campaign [PDF]

, 2006
[ 1] In July 2002 the VELETA-2002 field campaign was held in Sierra Nevada ( Granada) in the south of Spain. The main objectives of this field campaign were the study of the influence of elevation and atmospheric aerosols on measured UV radiation. In the
A. Alcántara, A. Labajo, A. M. Díaz, A. M. Silva, Alados-Arboledas, Alcántara, Anderson, Blanco-Muriel, Bodhaine, Cachorro, Cachorro, Campanelli, Cannon, Dubovik, Eck, et al., F. J. Olmo, Gueymard, H. Horvath, Holben, Holben, Iqbal, J. A. Martínez-Lozano, J. A. Rodrigues, J. Cañada, J. Lorente, J. P. Díaz, Kasten, Kaufman, Kuester, L. Alados-Arboledas, Labajo, M. P. Utrillas, M. Pujadas, M. Sorribas, Martínez-Lozano, Martínez-Lozano, Martínez-Lozano, McArthur, Michalsky, Mitchell, Morys, Nann, Pedrós, Pietras, Riordan, Russell, Schimid, Schmid, Schmid, Shaw, Slusser, T. Elías, Utrillas, V. Cachorro, V. Estellés, World Meteorological Organization (WMO), X. de Cabo, Y. García   +58 more
core   +2 more sources

Los intereses de la Argentina y Estados Unidos en el marco del área de libre comercio de las americas

Estudios Económicos, 2006
El objetivo del trabajo es el de analizar las distintas alternativas que presentan las relaciones económicas entre la Argentina y los Estados Unidos. Conforme a ello se comienza reseñando históricamente tales relaciones desde el siglo XVII hasta llegar a
Arturo José Guevara
doaj