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Search Results: 1 - 10 of 352254 matches for " Luís; "
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Binomial Hadamard Series and Inequalities over the Spectra of a Strongly Regular Graph  [PDF]
Luís Vieira
Applied Mathematics (AM) , 2018, DOI: 10.4236/am.2018.99071
Abstract:
Let G be a primitive strongly regular graph of order n and A is adjacency matrix. In this paper we first associate to A a real 3-dimensional Euclidean Jordan algebra?\"\" with rank three spanned by In and the natural powers of A that is a subalgebra of the Euclidean Jordan algebra of symmetric matrix of order n. Next we consider a basis?\"\" that is a Jordan frame of \"\". Finally, by an algebraic asymptotic analysis of the second spectral decomposition of some Hadamard series associated to A we establish some inequalities over the spectra and over the parameters of a strongly regular graph.
Investigation of the Source Relationship between Benzene Vapor and Alkylate-Containing Light Non-Aqueous Phase Liquid at Adjacent Industrial Facilities  [PDF]
Frank S. Muramoto, Jun Lu
Journal of Environmental Protection (JEP) , 2018, DOI: 10.4236/jep.2018.95036
Abstract: This study describes the investigations undertaken at two adjacent properties for known contaminants of concern and for resolution of other “unexpected” contaminant sources. One property is a manufacturing facility with impacts from chlorinated solvent compounds releases at the site. During site investigations, benzene was found present in subslab and multi-depth soil vapor probes installed beneath the basement floor of on-site buildings. Additional investigations at the manufacturing site were initiated in response to a recent, unexpected appearance of an unknown light non-aqueous phase liquid (LNAPL) in three on-site perched water zone wells as observed during sequential quarterly monitoring events and in a soil vapor extraction well. The other property is an adjacent petroleum facility that has ongoing LNAPL recovery operations from past releases at its site. A claim was made that benzene vapor at the manufacturing property was solely related to the LNAPL that migrated onto the facility. Multiple lines of evidence, including LNAPL migration pathways and chemical fingerprints, were used to show that the LNAPL was sourced from the petroleum facility. Further, benzene vapor present in subslab vapor probes installed for vapor intrusion purposes was believed to be sourced from the LNAPL and not from historical operations at the manufacturing facility. However, detailed analysis of vapor distributions, the subsurface stratigraphy, and LNAPL characteristics indicate that spills during past operations at the manufacturing facility itself were likely the source of the benzene vapor found in the subslab vapor probes.
Response of coleoptiles to water deficit: growth, turgor maintenance and osmotic adjustment in barley plants (Hordeum vulgare L.)  [PDF]
águeda González, Luís Ayerbe
Agricultural Sciences (AS) , 2011, DOI: 10.4236/as.2011.23022
Abstract: Cereal crop improvement programmes involve the analysis of a great number of lines every year; the availability of a simple, rapid method that would allow the identification of a trait in the early stages of plant development would facilitate the selection process. This work reports two experiments involving the germination of seeds in Petri dishes, performed to study the effect of water deficit on the growth of barley coleoptiles. In one experiment water stress was induced by allowing evaporation from the Petri dishes; in the other water stress was achieved by adding polyethylene glycol 6000. The growth of the control coleoptiles was greater than that of the treatment coleoptiles in all cases, but with differences between the different genotypes. A significant correlation (P < 0.01) was found between the relative growth of the coleoptiles and turgor maintenance in the seedlings. Significant correlations were also seen between the relative growth of the coleop-tiles and the osmotic adjustment of the flag leaf (P < 0.05) and the grain weight (P < 0.01) in adult plants. The genotypes that showed the greatest relative growth also showed the greatest capacity for osmotic adjustment in the flag leaf and produced the greatest yields in experiments with adult plants. The results indicate that the growth of coleoptiles subjected to water deficit could be used as a selection criterion in breeding programmes designed to improve the tolerance of barley to drought.
Shannon Entropy in Distributed Scientific Calculations on Mobiles Ad-Hoc Networks (MANETs)  [PDF]
Pablo José Iuliano, Luís Marrone
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2076
Abstract:

This paper addresses the problem of giving a formal metric to estimate uncertainty at the moment of starting a distributed scientific calculation on clients working over mobile ad-hoc networks (MANETs). Measuring the uncertainty related to the successful completion of a distributed computation on the aforementioned network infrastructure is based on the Dempster-Shafer Theory of Evidence (DST). Shannon Entropy will be the formal mechanism by which the conflict in the scenarios proposed in this paper will be estimated. This paper will begin with a description of the procedure by which connectivity probability is to be obtained and will continue by presenting the mobility model most appropriate for the performed simulations. Finally, simulations will be performed to calculate the Shannon Entropy, after which the corresponding conclusions will be presented.

Sheep and Goat Production in Portugal: A Dynamic View  [PDF]
Manuel Luís Tiberio, Francisco Diniz
Modern Economy (ME) , 2014, DOI: 10.4236/me.2014.56066
Abstract:

Sheep production is probably one of the oldest productions in the world. In early years this animal was considered as a domestic and productive one, since it provided families with milk, meat and wool. Besides providing all these products, the animals were not difficult to grow. They fed on many different floras that others would leave so their owners started to walk great distances with them to get the best grazing spots in winter and in summer. They called this transhumance. But in nowadays, animal feed became easier to get to. It was no longer necessary to move all the animals to pastures hundreds of kilometers away, and producers started going for shorter distances. Production also got more intensive, although sheep production was always considered to be more extensive rather than intensive. With this revision we intend to go over all the statistics concerning this production in Portugal and compare it in different years, to establish a correlation between them. Although sheep production is made entirely with autochthonous breeds and these are milk and meat production oriented, the meat production has a higher relevance in the sector. So it was necessary to make a more thorough approach to this production. There is also an interest in new and emergent ways of production which we discuss at the end of this revision, along with a small global analysis.

La serie enumerativa en el cierre de los discursos
Cortés,Luís;
Estudios filológicos , 2012, DOI: 10.4067/S0071-17132012000100003
Abstract: the openings and closings are the two main parts of a discourse. in the present study we focus on the closings of the discourses produced by the presidents of the spanish government, josé luis rodríguez zapatero and josé maría aznar, in the 'debates on the state of the nation' addressed in the present century. in all of them, the same sections and devices have been identifed. among these, particularly outstanding is what will be referred to here from a syntactic-semantic viewpoint as a "listing series", which is multipurpose in its functionality/ interaction potential. the priority of this element is in turn conditioned by the suitability of this device to convey the features of this stage of the discourse, in which a conclusive type of exposition, argumentative emphasis, and adornment are pre-eminent.
La serie enumerativa en el cierre de los discursos The listing series in the closing of discourses
Luís Cortés
Estudios filológicos , 2012,
Abstract: Los inicios y los cierres son las dos partes principales de un discurso. En nuestro estudio analizamos los cierres emitidos por los presidentes del gobierno espa ol José Luis Rodríguez Zapatero y José María Aznar, en los "Debates acerca del Estado de la Nación" celebrados en el presente siglo. En todos ellos hemos podido vislumbrar unos mismos apartados y unos mismos mecanismos. De entre estos, sin duda, el que va a desempe ar un papel más relevante es el denominado por nosotros serie enumerativa, construcción que establece relaciones de linealidad, tónicamente simétricas, equifuncionales, desde el punto de vista sintáctico-pragmático, y con multifuncionalidad intencional (o interactiva). Dicha importancia va a venir condicionada por la capacidad de este mecanismo para expresar los rasgos propios de esta fase del discurso dominada por la exposición conclusiva, el énfasis argumentativo y el ornato. The openings and closings are the two main parts of a discourse. In the present study we focus on the closings of the discourses produced by the presidents of the Spanish Government, José Luis Rodríguez Zapatero and José María Aznar, in the 'Debates on the State of the Nation' addressed in the present century. In all of them, the same sections and devices have been identifed. Among these, particularly outstanding is what will be referred to here from a syntactic-semantic viewpoint as a "listing series", which is multipurpose in its functionality/ interaction potential. The priority of this element is in turn conditioned by the suitability of this device to convey the features of this stage of the discourse, in which a conclusive type of exposition, argumentative emphasis, and adornment are pre-eminent.
Self-Affinity, Self-Similarity and Disturbance of Soil Seed Banks by Tillage
Luís S. Dias
Plants , 2013, DOI: 10.3390/plants2030455
Abstract: Soil seed banks were sampled in undisturbed soil and after soil had been disturbed by tillage (tine, harrow or plough). Seeds were sorted by size and shape, and counted. Size-number distributions were fitted by power law equations that allowed the identification of self-similarity and self-affinity. Self-affinity and thus non-random size-number distribution prevailed in undisturbed soil. Self-similarity and thus randomness of size-number distribution prevailed after tillage regardless of the intensity of disturbance imposed by cultivation. The values of fractal dimensions before and after tillage were low, suggesting that short-term, short-range factors govern size-number distribution of soil seed banks.
Supporting Parallelism in Server-based Multiprocessor Systems
Luís Nogueira,Luís Miguel Pinho
Computer Science , 2011,
Abstract: Developing an efficient server-based real-time scheduling solution that supports dynamic task-level parallelism is now relevant to even the desktop and embedded domains and no longer only to the high performance computing market niche. This paper proposes a novel approach that combines the constant bandwidth server abstraction with a work-stealing load balancing scheme which, while ensuring isolation among tasks, enables a task to be executed on more than one processor at a given time instant.
SB-BACO4: A Gompertzian Discrete Model for Tree Competition
Barreto,Luís Soares;
Silva Lusitana , 2003,
Abstract: for interspecific competition between tree populations, the author proposes a discrete gompertzian model named sb-baco 4. the model is a direct extension of a discrete form of the gompertz equation. both deterministic and stochastic versions are exhibited. the model is capable of the correct recognition of six distinct patterns of tree interaction, previously defined by the author. he uses model sb-baco 4 to establish the simulator sb-pinhardi for mixed stands of quercus robur+pinus pinaster and fraxinus excelsior+pinus pinaster. in appendices, the author presents the listing of the program, written in basic, and a sample of its output. a general gompertzian explicit model for tree competition is also presented (sb-baco 5).
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