Results 91 to 100 of about 1,430,072 (322)
Multivariate Nonnegative Quadratic Mappings [PDF]
In this paper we study several issues related to the characterization of speci c classes of multivariate quadratic mappings that are nonnegative over a given domain, with nonnegativity de ned by a pre-speci ed conic order.In particular, we consider the ...
Zhang, S., Sturm, J.F., Luo, Z-Q
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Lost in aggregation? On the importance of local food price data for food poverty estimates
American Journal of Agricultural Economics, EarlyView.Abstract This paper explores within‐country variations in food price dynamics and food poverty estimates by employing local market price data and national consumer price index (CPI) data. Our results show that national CPI data may be useful for approximating national trends but they fail to detect and identify spatial variations in local trends, which
Stephan Dietrich +4 more
wiley +1 more source
Immunizing Conic Quadratic Optimization Problems Against Implementation Errors [PDF]
We show that the robust counterpart of a convex quadratic constraint with ellipsoidal implementation error is equivalent to a system of conic quadratic constraints.
Ben-Tal, A., Hertog, D. den
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American Journal of Agricultural Economics, EarlyView.Abstract Preferential trade agreements (PTAs) contain various non‐tariff provisions, yet identifying their trade effects remains challenging because these commitments are high‐dimensional and strongly correlated within agreements. We estimated a theory‐consistent structural gravity model with domestic flows for 26 agricultural subsectors over 1988–2017
Dongin Kim, Sandro Steinbach
wiley +1 more source
Jurnal EngineeringThis paper proposes a modified ultra‐high gain DC–DC boost converter. The proposed converter has improved the performance of the conventional converter by reducing the total number of components (1 Capacitor and 1 Inductor) in the design structure.
Abdullah Al Mahbub Emon +3 more
semanticscholar +1 more source
A "boost" szerepe az emlőrák sugárkezelésében
, 2017 Emlőmegtartó műtét feltétele, hogy a beteg adjuváns sugárkezelésben részesüljön. A teljes emlőbesugárzást követően lehetőség van, az emlő tumorágy úgynevezett "boost" besugárzására. A boost besugárzására a DEKK Sugárterápián foton vagy elektron technikát
Borbély, Szandra
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A Semi-Quadratic Buck-Boost Converter with Two Operating Modes and a Sustained Input-Output Current for PV Applications [PDF]
International Journal of Industrial Electronics, Control and OptimizationThis study introduces a non-isolated semi-quadratic DC/DC buck-boost converter designed to enhance performance. Derived from a conventional CUK converter, the proposed topology operates in two distinct modes: one providing a semi-quadratic voltage gain ...
Mustafa Okati, Mohammad Osmani-Bojd
doaj +1 more source
Conversores cc-cc de alto ganho de tensão não isolados com rendimento elevado formados pela integração de conversores cc-cc básicos [PDF]
, 2012 Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica.: Este trabalho apresenta o estudo de conversores CC-CC de alto ganho de tensão não isolado e rendimento elevado, baseado em ...
Tanca Villanueva, Moisés Carlos
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Conversores CC-CC não-isolados de alto ganho e de alto rendimento destinados a aplicações fotovoltaicas e baseados no conversor boost com célula de ganho [PDF]
, 2015 Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2015.Esta dissertação apresenta um estudo sobre conversores cc-cc não-isolados aplicados ao ...
Schmitz, Lenon
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Models for Quadratic Algebras Associated with Second Order Superintegrable Systems in 2D [PDF]
, 2008 There are 13 equivalence classes of 2D second order quantum and classical superintegrable systems with nontrivial potential, each associated with a quadratic algebra of hidden symmetries.
Willard Miller Jr. +5 more
core +1 more source