Results 71 to 80 of about 98,268 (272)
Agribusiness, EarlyView.Abstract The Russian invasion of Ukraine in February 2022 had profound consequences for the global economy. As both countries are major commodity exporters, the food value chain was also affected. This study investigates the impact of the invasion on stock prices, profitability and sentiments of agribusinesses along the food supply chain by using an ...
Julia Höhler +2 more
wiley +1 more source
Localization of AUVs for Ship Hull Inspection: A Review
IEEE AccessShip hull inspection is crucial for assessment of hull damage, biological fouling, and for detection of foreign objects (mines, illegal drug packages, etc.). These inspections require advanced planning, long periods of time, resources (people, facilities,
Gary A. Benson +2 more
doaj +1 more source
On the hull numbers of torus links [PDF]
arXiv, 2004 The n-th hull of a union of curves in R^3 is the set of points with the property: Any plane passing through the point intersects the curves at least 2n times. The hull number u(L) of a link L is defined as the minimum number of non-empty hulls a representative of L can have.
arxiv
Note on the Complexity of the Mixed-Integer Hull of a Polyhedron [PDF]
arXiv, 2014 We study the complexity of computing the mixed-integer hull $\operatorname{conv}(P\cap\mathbb{Z}^n\times\mathbb{R}^d)$ of a polyhedron $P$. Given an inequality description, with one integer variable, the mixed-integer hull can have exponentially many vertices and facets in $d$.
arxiv
Grass functional traits reflect the long history of fire and grazers in the savannas of Texas
American Journal of Botany, EarlyView.Abstract Premise Understanding relationships among grass traits, fire, and herbivores may help improve conservation strategies for savannas that are threatened by novel disturbance regimes. Emerging theory, developed in Africa, emphasizes that functional traits of savanna grasses reflect the distinct ways that fire and grazers consume biomass ...
Ashish N. Nerlekar +2 more
wiley +1 more source
Hull Form Optimization with Principal Component Analysis and Deep Neural Network [PDF]
arXiv, 2018 Designing and modifying complex hull forms for optimal vessel performances have been a major challenge for naval architects. In the present study, Principal Component Analysis (PCA) is introduced to compress the geometric representation of a group of existing vessels, and the resulting principal scores are manipulated to generate a large number of ...
arxiv
Modeling the spatial evolution wildfires using random spread process
Environmetrics, Volume 33, Issue 8, December 2022., 2022 Abstract The study of wildfire spread and the growth of the area burned is an important task in ecological studies and in other contexts. In this work we present a model for fire spread and show the results obtained from simulations of burned areas. The model is based on probabilities of fire at different locations. Such probabilities are obtained from
Carlos Díaz‐Avalos, Pablo Juan
wiley +1 more source
Cohomology of the continuous hull of a combinatorial pentagonal tiling [PDF]
arXiv, 2013 In the article "Construction of the continuous hull for the combinatorics of a regular pentagonal tiling of the plane" we constructed the continuous hull for the combinatorics of "A regular pentagonal tiling of the plane", and in the article "Continuous hull of a combinatorial pentagonal tiling as an inverse limit" we showed how we could write this ...
arxiv
Angewandte Chemie, EarlyView.Kombinierte in situ XAS‐ und elektrochemische Charakterisierungen zeigen die strukturelle Umordnung von kohlenstoffgestützten Fe/Co/Ni‐Einzelatomkatalysatoren während der Wasseroxidation. Unsere Ergebnisse unterstreichen die Bildung von doppelten Metallaktivzentren, die durch Sauerstoffatome überbrückt sind, und liefern entscheidende mechanistische ...
Wenchao Wan +9 more
wiley +1 more source
Latin American Journal of Solids and StructuresThis paper describes an extended formulation for the coupled beam method (CBM). The method is originally developed for elastic bending response analysis of passenger ships with large multi-deck superstructures. The extension is mainly performed to enable
Fattaneh Morshedsolouk +1 more
doaj +1 more source