Results 11 to 20 of about 2,076,711 (304)

Computing the Center Region and Its Variants [PDF]

Theoretical Computer Science, 2017
We present an $O(n^2\log^4 n)$-time algorithm for computing the center region of a set of $n$ points in the three-dimensional Euclidean space. This improves the previously best known algorithm by Agarwal, Sharir and Welzl, which takes $O(n^{2+ε})$ time for any $ε> 0$.
Eunjin Oh 0001, Hee-Kap Ahn
openaire   +6 more sources

European integration, FDI and the internal geography of trade : evidence from Western European border regions [PDF]

, 2005
In this paper we use a gravity model to study the trade performance of French and Spanish border regions relatively to non-border regions, over the past two decades.
Paluzie, Elisenda, Lafourcade, Miren
core   +4 more sources

Phytochemical analysis, antioxidant and photoprotective activities of aqueous extract of Euphorbia retusa Forssk. different parts from Algeria

Acta Agriculturae Slovenica, 2022
Euphorbia retusa is an endemic medicinal plant of Sahara. This study aimed to determine the total phenolic and flavonoid contents of Euphorbia retusa seed, capsule and leaves aqueous extracts as well as to evaluate the antioxidant and photoprotective ...
Selwa LAHMADI, Mohamed Seif Allah KECHEBAR, Samira KAROUNE, Chawki BENSOUICI, Lynda GALI, Latifa KHATTABI, Hasna BOURAL, Amina CHOUH, Somia SAAD   +8 more
doaj   +1 more source

Life quality in the Center and Periphery of the Urals and the Volga regions [PDF]

, 2021
The quality of life plays a crucial role in ensuring sustainable development and improving human interaction with the environment, solving environmental problems.
Victor Barkhatov, Dmitri Pletnev, Barkhatov Victor, Pletnev Dmitri   +3 more
core   +1 more source

Revisiting mechanics of ice–skate friction: from experiments at a skating rink to a unified hypothesis

Journal of Glaciology, 2022
The mechanics underlying ice–skate friction remain uncertain despite over a century of study. In the 1930s, the theory of self-lubrication from frictional heat supplanted an earlier hypothesis that pressure melting governed skate friction. More recently,
James H. Lever, Austin P. Lines, Susan Taylor, Garrett R. Hoch, Emily Asenath-Smith, Devinder S. Sodhi   +5 more
doaj   +1 more source

Seed Systems of Traditional African Vegetables in Eastern Africa: A Systematic Review

Frontiers in Sustainable Food Systems, 2021
Traditional African Vegetables (TAV) play an important role in the livelihoods, food and nutritional security of local populations. Access to high-quality seeds of improved varieties is a foundation for increasing crop productivity. TAV seed systems have
Mathieu A. T. Ayenan, Mathieu A. T. Ayenan, Lys Amavi Aglinglo, Herbaud P. F. Zohoungbogbo, Sognigbe N'Danikou, Judith Honfoga, Fekadu F. Dinssa, Peter Hanson, Victor Afari-Sefa   +8 more
doaj   +1 more source

Bulb Yield Stability Study of Onion Lines over Locations and Seasons in Ghana and Mali

Agronomy, 2022
Onion is one of the most economically and nutritionally important vegetable crops in West Africa. Onions are very important for consumers due to the antioxidants and compounds they contain that may reduce inflammation, lower triglycerides and reduce ...
Jean Baptiste De La Salle Tignegre, Alpha Sidy Traore, Moumouni Konate, Paul Alhassan Zaato, Ba Germain Diarra, Peter Hanson, Fred Kizito, Birhanu Zemadim Birhanu, Victor Afari-Sefa   +8 more
doaj   +1 more source

The Logarithmic Center of a Planar Region [PDF]

Proceedings of the American Mathematical Society, 1976
Given a bounded region S S in the complex plane, let
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CENTER-PERIPHERY: DETERMINATION OF THE SPHERE OF INTERACTION OF THE REGIONAL CENTER AND DISTRICTS OF THE REGION [PDF]

Efektyvna ekonomika, 2020
У статті детерміновано сфери взаємодії у системі «центр – периферія» на рівні «обласний центр – територія області». Виділено три ключові сфери взаємодій: обласний центр (ядро) ↔ приміська зона; обласний центр (ядро) ↔ напівпериферійні райони; обласний центр (ядро) ↔ периферійні райони. Встановлено: 1) чи не найщільнішими взаємовпливами характеризуються
openaire   +1 more source

Does melanin-based plumage coloration reflect health status of free-living birds in urban environments?

Avian Research, 2021
Background Ecological functions and processes in urban ecosystems are governed by various human activities. City-adapted and city-exploiting animal species are expected to present certain specific behavioral and physiological traits in comparison to city-
Hani Amir Aouissi, Mostefa Ababsa, Aissam Gaagai, Zihad Bouslama, Yassine Farhi, Haroun Chenchouni   +5 more
doaj   +1 more source