Results 51 to 60 of about 465,642 (308)
Unequal Error Protection QPSK Modulation Codes [PDF]
, 1992 The authors use binary linear UEP (LUEP) codes, in combination with a QPSK signal set and Gray mapping, to obtain new efficient block QPSK modulation codes with unequal minimum squared Euclidean distances.
Lin, Shu, Morelos-Zaragoza, Robert H
core +1 more source
The Degradation of Access‐Based Business Models: Customer Misbehavior and Shared Mobility
Business Strategy and the Environment, EarlyView.ABSTRACT Access‐based services are considered one of the strategies to embed sustainability in business models. Yet, because the evolution of these business models has been overlooked, we do not know whether their promise to create triple value is sustained.
Andres Camacho, Carmen Valor
wiley +1 more source
Transformación urbana y procesos territoriales recientes en Zaragoza y su espacio metropolitano
Estudios Geográficos, 2015 En las últimas dos décadas el área urbana de Zaragoza ha conocido unos crecimientos urbanísticos, residenciales y demográficos elevados, tanto en la periferia metropolitana, pero sobre todo en la ciudad central, hasta llegar a la actual crisis económica ...
Rafael de Miguel González
doaj +1 more source
Effect of crosslinker length on the elastic and compression modulus of poly(acrylamide) nanocomposite hydrogels [PDF]
, 2017 Polymer hydrogelshave shown to exhibit improved properties upon the addition of nanoparticles; however, the mechanical underpinnings behind these enhancements have not been fully elucidated.
Asuri, Prashanth +2 more
core +1 more source
The Canadian Journal of Chemical Engineering, EarlyView.Abstract The synthesis and characterization of an amphiphilic nitroxide to be used as a controlling agent in a nitroxide‐mediated living radical polymerization in aqueous dispersion media is presented. In the first stage of nitroxide synthesis (phthalimide protection), two reaction methods were employed: traditional and microwave.
Enrique García‐Leal +3 more
wiley +1 more source
Ser y parecer en el Antiguo Régimen. Los problemas de un regidor bajito
Memoria y Civilización, 2000 This article is divided into two parts: the first one begins with a brief story about a protocol conflict based upon local documents (Zaragoza XVIIIth-XIXth centuries).
Francisco Javier Maestrojuán Catalán
doaj
Las primeras mezquitas de al-Andalus a través de las fuentes árabes (92/711 – 170/785)
Al-Qantara : Revista de Estudios Arabes, 2007 En el artículo se recogen los relatos que las fuentes árabes, sobre todo andalusíes, proporcionan sobre las primeras fundaciones religiosas de al-Andalus.
Susana Calvo Capilla
doaj +1 more source
Block QPSK modulation codes with two levels of error protection [PDF]
, 1994 A class of block QPSK modulation codes for unequal error protection (UEP) is presented. These codes are particularly suitable either for broadcast channels or for communication systems where parts of the information messages are more important than ...
Lin, Shu, Morelos-Zaragoza, Robert H
core +1 more source
A Trade-off Analysis of Energy Detectors and Partitioned Search for Primary Detection [PDF]
, 2009 Cognitive radios aim to coexist in the unused spectrum bands which are licensed to primary users without harming the primary transmission/reception. For a cognitive radio, it is important to detect the band in which the primary is operating as fast as ...
Morelos-Zaragoza, Robert H +2 more
core +3 more sources
Ecography, EarlyView.Invasive freshwater bivalves harm native species, ecosystems and biodiversity, and incur economic costs. The enemy release hypothesis posits that invasive species are released from enemies during the invasion process, giving them a competitive advantage in the new environment.
Binglin Deng +8 more
wiley +1 more source