Results 81 to 90 of about 74,000 (316)
Ciência Rural, 2011 A ureia é a principal fonte de N usada na agricultura, mas apresenta grandes perdas em arroz irrigado por alagamento. O objetivo deste trabalho foi avaliar a eficiência de fontes de N alternativas à ureia para utilização pelo arroz irrigado aplicadas em ...
Enio Marchesan +6 more
doaj +1 more source
Advanced Engineering Materials, EarlyView.Geometry‐driven thermal behavior in wire‐arc additive manufacturing (WAAM) influences microstructural evolution during nonequilibrium solidification of a chemically complex Fe–Cr–Nb–W–Mo–C nanocomposite system. By comparing different deposits configurations, distinct entropy–cooling rate correlations, segregation, and carbide evolution are revealed ...
Blanca Palacios +5 more
wiley +1 more source
Global-scale modeling of nitrogen balances at the soil surface [PDF]
, 2005 This paper provides global terrestrial surface balances of nitrogen (N) at a resolution of 0.5 by 0.5 degree for the years 1961, 1995 and 2050 as simulated by the model WaterGAP-N.
Siebert, Stefan
core
CFA Institute Magazine, 2013 “In the long run, we may all be dead, as Keynes suggested, but we need to make sure that the short run doesn’t kill us first,” says Andrew Lo.
openaire +2 more sources
Advanced Engineering Materials, EarlyView.The presented study focuses on the fracture behaviour of carbon‐bonded magnesia MgO–C refractories, where environmentally friendly fructose, collagen and lignin serve as temporary binding agents. The partial substitution of the source material with recycled MgO–C reduces the fracture resistance, which can be counteracted by the additional introduction ...
Marc Neumann +6 more
wiley +1 more source
Suitability of Mycorrhiza-Defective Rice and Its Progenitor for Studies on the Control of Nitrogen Loss in Paddy Fields via Arbuscular Mycorrhiza [PDF]
, 2020 Employing mycorrhiza-defective mutants and their progenitors does not require inoculation or elimination of the resident microbial community in the experimental study of mycorrhizal soil ecology.
Guo, Xinyue +5 more
core +1 more source
High-frequency volatility of volatility estimation free from spot volatility estimates
Quantitative Finance, 2014 We define a new consistent estimator of the integrated volatility of volatility based only on a pre-estimation of the Fourier coefficients of the volatility process. We investigate the finite sample properties of the estimator in the presence of noise contaminations by computing the bias of the estimator due to noise and showing that it vanishes as the
MANCINO, MARIA ELVIRA +2 more
openaire +2 more sources
Sol–Gel Derived Polymer Precursors for Stereolithography of ZrC
Advanced Engineering Materials, EarlyView.ZrC is a critical material target for extreme temperature conditions. This report describes a protocol for preparing ZrC ceramics via stereolithography and examines the impact of the polymer matrix on carbothermal reduction and mechanical stability of 3D printed ZrC.
Charles J. Rafalko +2 more
wiley +1 more source
Improving N use and performance of arable crops on organic arable farms using an expert group approach (OF0178) [PDF]
, 2002 This is the final report for Defra project OF0178. Government seeks to support the development of organic farming in the UK, but nitrogen (N) almost always limits productivity on organic farms.
Anon
core
Chemical diffusion of fluorine in melts in the system Na2OAl2O3SiO2 [PDF]
, 1985 The volatilization of fluorine from three melts in the system Na2OAl2O3SiO2 has been investigated at 1 atm pressure and 1200–1400°C. The melts chosen have base compositions corresponding to albite, jadeite and a peraluminous melt with 75 mole % SiO2 ...
Al-Dulaimy +34 more
core +1 more source