Results 51 to 60 of about 179 (138)

Soil texture prevails over vegetation change in determining soil organic carbon storage in an African savanna

Journal of Ecology, Volume 114, Issue 4, April 2026.
We compared soil organic carbon (SOC) across six savanna–forest boundaries in South Africa. Surprisingly, savanna and forest soils contained comparable SOC stocks. While vegetation change shifted the carbon source from C4‐grasses to C3‐trees, total carbon storage was driven by local soil texture (clay/silt), proving that increasing tree cover does not ...
Yong Zhou, Chandra Man Rai, Sekou Noble‐Kuchera, Mariska te Beest, Siphesihle Mbongwa, Corli Coetsee   +5 more
wiley   +1 more source

Analysing time-fractional exotic options via efficient local meshless method

Results in Physics, 2020
In this article, we analyse the numerical simulation of the time-fractional Black-Scholes model governing butterfly spread option, digital option and double barrier option.
Mustafa Inc, Muhammad Nawaz Khan, Imtiaz Ahmad, Shao-Wen Yao, Hijaz Ahmad, Phatiphat Thounthong   +5 more
doaj   +1 more source

Race‐related research in economics

Economica, Volume 93, Issue 370, Page 403-438, April 2026.
Abstract Issues of racial justice and economic inequalities between racial and ethnic groups have risen to the top of public debate. Economists' ability to contribute to these debates is based on the body of race‐related research. We study the volume and content of race‐related research in economics.
Arun Advani, Elliott Ash, Anton Boltachka, David Cai, Imran Rasul   +4 more
wiley   +1 more source

Urban and Power Plant NOx Emissions in Sub‐Saharan Africa Inferred From TROPOMI

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 4, 28 February 2026.
Abstract Nitrogen oxides (NOx) emissions are increasing rapidly in Sub‐Saharan Africa, affecting local air quality. Outside South Africa, most hotspots are relatively small, posing a challenge for traditional top‐down inversions. We tailor an existing top‐down wind rotation and Gaussian plume fit inversion to suit the relatively small NOx hotspots for ...
Eloise A. Marais, Nana Wei, Eric Y. P. Tan, Gongda Lu, Sekou Keita, Mogesh Naidoo, Rebecca M. Garland   +6 more
wiley   +1 more source

A class of intrinsic parallel difference methods for time-space fractional Black–Scholes equation

Advances in Difference Equations, 2018
To quickly solve the fractional Black–Scholes (B–S) equation in the option pricing problems, in this paper, we construct pure alternative segment explicit–implicit (PASE-I) and pure alternative segment implicit–explicit (PASI-E) difference schemes for ...
Yue Li, Xiaozhong Yang, Shuzhen Sun
doaj   +1 more source

Multithread Approximation: An OpenMP Constructor

Concurrency and Computation: Practice and Experience, Volume 38, Issue 4, February 2026.
ABSTRACT This study introduces an OpenMP construct designed to simplify and unify the integration of approximate computing techniques into shared‐memory parallel programs. Approximate Computing leverages the inherent error tolerance of many applications to trade computational accuracy for gains in performance and energy efficiency.
João Briganti de Oliveira, Rogério Aparecido Gonçalves, João Fabrício Filho   +2 more
wiley   +1 more source

Dynamic Debt With Intensity‐Based Models

Journal of Futures Markets, Volume 46, Issue 2, Page 334-352, February 2026.
ABSTRACT This article proposes a dynamic debt model where the face value of debt can change. In particular, our dynamic debt setting allows debt changes ruled by intensity processes that are linked to the firm value through the correlation between the stochastic processes. Analytical solutions are obtained, and we extend the proposed dynamic debt model
João Miguel Reis, José Carlos Dias
wiley   +1 more source

Implicit cubic B-spline scheme for the fractional Black-Scholes model with Caputo-Hadamard derivative [PDF]

Journal of Mahani Mathematical Research
In this study, we introduce a novel numerical scheme for solving the Black–Scholes equation endowed with a Caputo-Hadamard fractional time derivative. The temporal derivative is discretized via a finite-difference approach, ensuring both stability and ...
Roya Montazeri
doaj   +1 more source

N2 fixation is linked to the ability to encroach in African savanna trees

Functional Ecology, Volume 40, Issue 2, Page 517-533, February 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Encroachment is a globally ubiquitous phenomenon, characterised by increasing indigenous tree densities in savanna and grassland. Encroachment has been attributed to rising atmospheric CO2 concentrations fertilising tree growth and shifting the competitive balance ...
Elizabeth M. Telford, Kimberley Simpson, Lorna Street, Emily Fletcher, Richard Carkeek, Russell B. Dixon, Katie J. Field, Emma Jones, Sarah L. Raubenheimer, Edith Singini, Brad Ripley, Colin P. Osborne, Caroline E. R. Lehmann   +12 more
wiley   +1 more source

A Novel Fourth-Order Finite Difference Scheme for European Option Pricing in the Time-Fractional Black–Scholes Model

Mathematics
This paper addresses the valuation of European options, which involves the complex and unpredictable dynamics of fractal market fluctuations. These are modeled using the α-order time-fractional Black–Scholes equation, where the Caputo fractional ...
Xin Cai, Yihong Wang
doaj   +1 more source