Results 51 to 60 of about 35,990 (188)

Estimating Causal Effects With Observational Data: Guidelines for Agricultural and Applied Economists

Journal of Agricultural Economics, EarlyView.
ABSTRACT Most research questions in agricultural and applied economics are causal in nature: they study how changes in one or more variables (such as policies, prices or weather) affect one or more other variables (e.g., income, crop yields or pollution).
Arne Henningsen, Guy Low, David Wuepper, Tobias Dalhaus, Hugo Storm, Dagim Belay, Stefan Hirsch   +6 more
wiley   +1 more source

Blubber Thickening Driven by UCP1 Inactivation: Insights from a Cetacean‐Like Transgenic Mouse Model

Integrative Zoology, EarlyView.
UCP1 inactivation of cetaceans in mice drives BAT whitening and iWAT hyperplasia, promoting fat accumulation for aquatic adaptation. Abstract Cetaceans possess thick blubber, a specialized adipose tissue essential for thermal insulation, a streamlined body form, energy storage, and buoyancy. However, the mechanisms that underpin this adaptation are not
Qian Zhang, Yuehua Wang, Hang Zhang, Guiping Xu, Shixia Xu, Guang Yang   +5 more
wiley   +1 more source

Global agricultural value chains and food prices

American Journal of Agricultural Economics, EarlyView.
Abstract We study the relationship between the extent of participation in global agricultural value chains (GAVCs) and food prices at the country level. Using longitudinal data on a sample of 138 countries for the period 2000–2015 and a shift‐share instrumental variable design, we study how the extent of a country's participation in GAVCs in a given ...
Bernhard Dalheimer, Marc F. Bellemare
wiley   +1 more source

Optimum aerodynamic design for wind-lens turbine

Journal of Fluid Science and Technology, 2016
An optimum aerodynamic design method has been developed for the wind-lens turbine. The wind-lens turbine has a brimmed diffuser around a turbine rotor, which is referred to as wind-lens.
Nobuhito OKA, Masato FURUKAWA, Kenta KAWAMITSU, Kazutoyo YAMADA   +3 more
doaj   +1 more source

A numerical proof of the Betz–Joukowsky limit

Renewable Energy
According to the Betz–Joukowsky limit, the maximum power coefficient of a wind turbine is 16/27. This limit is obtained assuming a priori that the disk is radially uniformly-loaded. In other words, the proof of the limit does not evaluate the optimum type of the load distribution, but it directly speculates that radially uniform load is the optimal one.
Bontempo, R., Manna, M.
openaire   +2 more sources

The Betz–Joukowsky limit: on the contribution to rotor aerodynamics by the British, German and Russian scientific schools

Wind Energy, 2011
ABSTRACTThe derivation of the efficiency of an ideal wind turbine has been attributed to the three famous scientists of the three aerodynamic research schools in Europe during the first decades of the previous century: Lanchester, Betz and Joukowsky. However, detailed reading of their classical papers has shown that Lanchester did not accept Froude's ...
Valery L. Okulov, Gijs A.M. van Kuik
openaire   +1 more source

Arthropod niche differentiation linked to grazing‐induced sward islets in intensively managed agricultural pasture

Insect Conservation and Diversity, EarlyView.
In a given number of samples, grassland sward islets contain more species of arthropods than the surrounding sward. When corrected for abundance, there is no difference in species richness, suggesting that the effect of islets might purely be to concentrate arthropods. The community structure differences indicated by non‐metric multidimensional scaling
Alvin J. Helden, Annette Anderson, Gordon Purvis   +2 more
wiley   +1 more source

Analytical studies of new airfoils for wind turbines [PDF]

, 1981
Computer studies were conducted to analyze the potential gains associated with utilizing new airfoils for large wind turbine rotor blades. Attempts to include 3-dimensional stalling effects were inconclusive.
Calhoun, J. T., Wentz, W. H., Jr.
core   +1 more source

‘Theological Metaphysics’ and the Christological Determination of the Principle of Analogy: A Response to John Betz's Christ, the Logos of Creation

International Journal of Systematic Theology, EarlyView.
Abstract This paper is a response to John Betz's book, Christ, the Logos of Creation: An Essay in Analogical Metaphysics (Emmaus Academic, 2023). The essay confines itself to answering two methodological questions, namely: Does Przywara's approach to analogy indeed represent the basic form (‘Denkform’) that analogy has ‘always assumed’ in Catholic ...
Archie J. Spencer
wiley   +1 more source

Mid- to Far-Infrared spectroscopy of Sharpless 171 [PDF]

, 2003
We have collected one-dimensional raster-scan observations of the active star-forming region Sharpless 171 (S171), a typical HII region-molecular cloud complex, with the three spectrometers (LWS, SWS, and PHT-S) on board ISO.
Baluteau, Boreiko, Boreiko, Cardelli, Carral, Cartledge, Caux, Chan, Clegg, de Graauw, Draine, Felli, Fitzpatrick, Fitzpatrick, Giannini, H. Shibai, Haas, Habing, Harten, Hollenbach, Hollenbach, Holweger, Jones, Jones, Jones, Kaufman, Keenan, Kessler, Kraemer, Lemke, Liseau, MacConnell, Martín-Hernández, Mathis, Mizutani, Mizutani, Moorwood, Morisset, Morton, Poglitsch, Rossano, Rubin, Savage, Sembach, Sofia, Swinyard, T. Onaka, Tielens, Tielens, Vastel, Watson, Wolfire, Wright, Y. Doi, Y. Okada, Yang   +55 more
core   +1 more source