Results 61 to 70 of about 397,762 (245)

Alpine greening deciphered by forest stand and structure dynamics in advancing treelines of the southwestern European Alps

Remote Sensing in Ecology and Conservation, EarlyView.
Multidecadal satellite observations, like those from Landsat, enable the study of vegetation greenness trends at extensive spatial and temporal scales. Alpine ecosystems show significant increases in vegetation greenness, but the ecological processes driving this greening are less understood.
Arthur Bayle, Baptiste Nicoud, Jérôme Mansons, Loïc Francon, Christophe Corona, Philippe Choler   +5 more
wiley   +1 more source

Examining the Affordances of Engineering and Curricular Supports for Learning Among Emerging Bilingual Elementary Afterschool Students

Science Education, EarlyView.
ABSTRACT Engineering design provides students with unique opportunities to engage with disciplinary knowledge and practices by engaging with technologies and each other through the design process. In this paper, we identify how the co‐construction of an engineering afterschool club culture supported students’ engagement in epistemic practices of ...
Kathryn M. Bateman, Gregory J. Kelly, Peter R. Licona, Christine M. Cunningham   +3 more
wiley   +1 more source

Resource reallocation across successive systemic innovations: How Rolls‐Royce shaped the evolution of the turbojet, turboprop, and turbofan

Strategic Management Journal, EarlyView.
Abstract Research Summary Despite the importance of resource reallocation in shaping a variety of strategic outcomes, strategy scholars have paid only limited attention to the processes by which firms reallocate their resources across successive systemic innovations.
Gino Cattani, Mariano Mastrogiorgio, Giuseppe Carignani   +2 more
wiley   +1 more source

Amplifier‐Based Programmable Metasurface for Bidirectional Full Polarization Enhancement

Small Structures, EarlyView.
An amplifier‐based programmable metasurface is proposed to enhance bidirectional propagation of various polarized electromagnetic waves. The metasurface incorporates patch scatterers, reconfigurable phase shifters, and negative resistors to manipulate wave direction and improve wireless communication coverage. The Class‐E reflection amplifier minimizes
Xin Wang, Jia Qi Han, Kun Yi Zhang, De Xiao Xia, Hai Xia Liu, Long Li   +5 more
wiley   +1 more source

Taxonomy and dated molecular phylogeny of Allium oreophilum sensu lato (A. subg. Porphyroprason) uncover a surprising number of cryptic taxa

TAXON, EarlyView.
Abstract Allium oreophilum, hitherto the representative of the monotypic A. subg. Porphyroprason from the second evolutionary lineage of Allium, is studied in detail. Over about 150 years, A. oreophilum was regarded as a somewhat polymorphous species with two synonyms, all described in the 19th century.
Nikolai Friesen, Georgy Lazkov, Igor G. Levichev, Mathias Leweke, Daulet Abdildanov, Nazgul Turdumatova, Ramazan Murtazaliev, Smatula Dzumanov, Gulnara T. Sitpayeva, Polina Vesselova, Vladimir Epiktetov, Kuddisi Ertuğrul, Osman Tugay, Reinhard M. Fritsch   +13 more
wiley   +1 more source

Resolving taxa in a challenging orchid species complex using evidence from phylogenetics, morphometrics and floral scent chemistry

TAXON, EarlyView.
Abstract Species can be difficult to circumscribe using morphology alone, and additional data can thus be useful for resolving challenging species complexes. Here we provide a case study of a South African orchid species complex which we resolved by analysing morphology, floral scent chemistry and molecular data.
Steven D. Johnson, Benny Bytebier
wiley   +1 more source

An observational study of a circular gust front over the Yangtze Delta, China

Weather, EarlyView.
Concentric gust fronts are formed when a thunderstorm's downdraft reaches the ground and the outflow from the cold pool spreads uniformly outwards into the surrounding warm and humid air mass. Observational evidence presented here show the case of narrow‐band echoes forming a ring around a thunderstorm.
Wenjie Zhou, Wendong Hu, Jianhua Dai, Puyuan Du, Lu Lu, Yongkai Zhang, Yanqiong Hao   +6 more
wiley   +1 more source

Winter browsing by moose (Alces alces) in a forested mountainous landscape of west–central Sweden

Wildlife Biology, EarlyView.
Browsing ecology involving ungulates and their food resource is complex as consumption may reflect responses to various factors, such as quantity and quality of browse species. This study investigated winter browsing by moose Alces alces in a mountainous landscape of west–central Sweden, characterized by Norway spruce Picea abies production forests ...
Ella Hambeson, Ewa H. Orlikowska, Märtha Wallgren   +2 more
wiley   +1 more source

An inequality for the altitudes of the excentral triangle

, 2020
We give inequalities for the altitudes of the excentral triangle and pose some open problems as conjectures.
openaire   +1 more source

Benefit or ecological trap? Monitoring the effects of small clear‐cuts on capercaillie Tetrao urogallus and its mammalian predators

Wildlife Biology, EarlyView.
The shift to ‘close to nature forestry' as the dominating forestry regime in western‐European forests has resulted in increasing timber volume and denser forests with negative effects on photophilic species. Hence, there is an increasing focus on active habitat management measures to support these species.
Maria Kochs, Joy Coppes, Tanja Beutel, Gabriel Holz, Jim‐Lino Kämmerle, Michael Kraft, Veronika Braunisch   +6 more
wiley   +1 more source