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Search Results: 1 - 10 of 10291 matches for " Esteban Adam Navas "
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On symplectic quandles
Esteban Adam Navas,Sam Nelson
Mathematics , 2007,
Abstract: We study the structure of symplectic quandles, quandles which are also R-modules equipped with an antisymmetric bilinear form. We show that every finite dimensional symplectic quandle over a finite field F or arbitrary field F of characteristic other than 2 is a disjoint union of a trivial quandle and a connected quandle. We use the module structure of a symplectic quandle over a finite ring to refine and strengthen the quandle counting invariant.
A priori bound on the velocity in axially symmetric Navier-Stokes equations
Zhen Lei,Esteban A. Navas,Qi S. Zhang
Mathematics , 2013,
Abstract: Let $v$ be the velocity of Leray-Hopf solutions to the axially symmetric three-dimensional Navier-Stokes equations. Under suitable conditions for initial values, we prove the following a priori bound \[ |v(x, t)| \le \frac{C}{r^2} |\ln r|^{1/2}, \]where $r \in (0, 1/2)$ is the distance from $x$ to the z axis, and $C$ is a constant depending only on the initial value. This provides a pointwise upper bound (worst case scenario) for possible singularities while the recent papers \cite{CSTY2} and \cite{KNSS} gave a lower bound. The gap is polynomial order 1 modulo a half log term.
A new characterization of Conrad's property for group orderings, with applications
Adam Clay,Andrés Navas,Cristóbal Rivas
Mathematics , 2009, DOI: 10.2140/agt.2009.9.2079
Abstract: We provide a pure algebraic version of the dynamical characterization of Conrad's property. This approach allows dealing with general group actions on totally ordered spaces. As an application, we give a new and somehow constructive proof of a theorem first established by Linnell: an orderable group having infinitely many orderings has uncountably many. This proof is achieved by extending to uncountable orderable groups a result about orderings which may be approximated by their conjugates. This last result is illustrated by an example of an exotic ordering on the free group given in the Appendix.
Introducción al procesado pulvimetalúrgico del titanio
Esteban, P. G.,Bolzoni, L.,Ruiz-Navas, E. M.,Gordo, E.
Revista de Metalurgia , 2011,
Abstract: The development of new extraction processes to produce titanium in powder form leads Powder Metallurgy to an advantage position among the manufacturing processes for titanium. The cost reduction of base material, coupled with the economy of the powder metallurgy processes, give titanium industry the chance to diversify its products, which could lead to production volumes able to stabilise the price of the metal. This work reviews some of the Powder Metallurgy techniques for the manufacturing of titanium parts, and describes the two typical approaches for titanium manufacturing: ‘Blending Elemental’ and ‘Prealloyed Powders’. Among others, conventional pressing and sintering are described, which are compared with cold and hot isostatic pressing techniques. Real and potential applications are described. El desarrollo de las nuevas tecnologías de extracción de titanio, que producen titanio elemental directamente en forma de polvo, sitúan a la pulvimetalurgia en un puesto estratégico para la fabricación de componentes de titanio. La disminución de coste del material base, junto a la economía de los procesos pulvimetalúrgicos, hacen más viable la diversificación de la industria del titanio, lo que permitiría alcanzar volúmenes de producción capaces de popularizar el metal y estabilizar su precio. En este trabajo se muestran algunas de las técnicas pulvimetalúrgicas empleadas para la fabricación de componentes de titanio a partir de los dos enfoques clásicos de mezcla de polvos elementales y el uso de polvos prealeados. Se describen entre otras las técnicas de prensado y sinterización convencional o compactación isostática en frío y caliente, que tratan de competir con las técnicas de procesado convencional, y se muestran algunas aplicaciones actuales y potenciales.
Child’s Life, Step-Family and Decision-Making Process  [PDF]
Susana Navas Navarro
Beijing Law Review (BLR) , 2013, DOI: 10.4236/blr.2013.42008

Step-families are included within the concept of “family” used by both Art. 8 of the Rome Convention for the protection of Human Rights and Fundamental Freedoms and Art. 7 of the European Charter of Fundamental Rights of 2010. According to the OECD and EUROSTAT figures children that are living in step-families are between 8 and 12 years old, that is, they could be considered as preadolescents or in some cases adolescents at all. Thus, they are individuals with a certain grade of maturity that allow them to form their own views and express them. Today, there is an inevitable link between family and children’s participation rights (Art. 12 CRC; Art. 24 EU Charter). Nevertheless, European Law refers to the step-family from the “adult’s rights” viewpoint concerning the assignment of the parental responsibility to the step-parent neglecting children’s perspective. As said by Art. 6(1) EU Treaty of Lisbon and by Art. 52(2) EU Charter, the last legal instrument has the same legal recognition as the EU Treaties, which implies that the bedrock for direct and vertical application of the fundamental rights of children by both the EUCJ and national Courts is settled. Since 2006 one of the strategic objectives of the communitarian institutions is prioritizing the effective implementation of children’s rights.

Resources to visualize some paradoxes that happens in the planet Mercury
Esteban, Esteban
Revista Eureka sobre Ense?anza y Divulgación de las Ciencias , 2011,
Abstract: En este trabajo se exponen una serie de circunstancias muy curiosas que se producen en el planeta Mercurio, relativas al movimiento del Sol respecto a su horizonte. También se explica la manera de hacer un modelo que permita visualizar algunas de ellas y la forma de escenificar otras.
La cúpula de Santa María del Fiore
Navas, Mariano
Informes de la Construccion , 1984,
Abstract: The construction of the dome of Santa María del Fiore involved solving the following two problems: first of all, to find a solution in which the horizontal thrusts did not exceed the capacity of the thin edge of the dome constructed. Secondly, the construction had to be carried out without centrings. Brunelleschi found an answer to both problems. He combined vertical Gothic style arches with horizontal ones, thus creating a veritable network of arches. The experience of the Middle Ages had made it clear to him that ogival arches transmit less horizontal thrusts than do half arches. He found the solution for the construction without centrings by studying Roman domes and in particular the Pantheon. La construcción de la Cúpula de Santa María del Flore suponía resolver los dos problemas siguientes: Por un lado, encontrar una solución en que los empujes horizontales no superaran la capacidad del esbelto cimborrio construido. Por otro, la construcción debía hacerse sin cimbra. Brunelleschi encontró respuesta para ambos problemas. Combinó arcos verticales al estilo gótico con otros horizontales, constituyendo un auténtico entramado espacial. La experiencia medieval le había puesto de manifiesto que el arco ojival transmite menores empujes horizontales que los de medio punto. La solución de la construcción sin cimbra la encontró reflexionando sobre las cúpulas romanas y, en particular, sobre el Panteón.
Parásitología molecular. Leishmaniasis
Adriana Navas
Biomédica , 2011,
The Provision of Legal Services to Consumers Using LawTech Tools: From “Service” to “Legal Product”  [PDF]
Susana Navas
Open Journal of Social Sciences (JSS) , 2019, DOI: 10.4236/jss.2019.711007
Abstract: We need legal services, but not always and, in any case, lawyers. There are other companies on the market, real business structures, which represent a highly recommended alternative to traditional law firms. These companies, mostly known by the English term “LegalTech” startups, offer their “products” to the final consumer. In this sense, they are able to facilitate access to, for example, writing of documents, the presentation of claims or the possibility to finding a suitable lawyer for the consumer’s case for free or at a very low cost. “LawTech” tools are especially suitable for small claims that, otherwise, and despite the European process established for that purpose, would not be suited. On the other hand, the provision of a “legal product” entails the provision of a “digital service or digital content”, so the issue should be linked to the recent and controversial Directive (EU) 2019/770, of Parliament European and of the Council of May 20, 2019 regarding certain aspects of the contracts for the provision of digital content and services. To distinguish between the provision of the legal service and the provision of the digital service or digital content is not always an easy task and, nevertheless, it is meaningful because it will affect the determination of the applicable norms; for example, regarding the lack of conformity or the mistakes or biases of the algorithm. Likewise, the explainability of the algorithm is a first-order issue in consumer’s protection, in relation to the pre-contractual information that should be supplied to them.
Optimal Selection and Allocation of Sectionalizers in Distribution Systems Using Fuzzy Dynamic Programming  [PDF]
Albornoz Esteban, Andreoni Alberto
Energy and Power Engineering (EPE) , 2010, DOI: 10.4236/epe.2010.24040
Abstract: This paper describes a calculation strategy that allows determining the optimal number and placement of sectionalizing switches in MV radial distribution networks, in correspondence to technical, regulatory and economical aspects. A formulation that takes into account the investment, maintenance and power interruption costs has been developed, seeking for a reduction in total costs while taking care of the regulatory and technical aspects. A multicriteria optimization procedure allows incorporating in the calculating process various quality indicators which can be either global or individual indexes. This way of formulation makes the proposal flexible as well as applicable to allow including aspects that were not considered in previous papers. The solution methodology is mainly based on dynamic programming, fuzzy logic, heuristics and economic analysis techniques. Given its flexibility, the proposed tool is easily adapted to real distribution systems, by considering the individual requirements of each network. The solutions obtained in simulations are oriented to help decision-making for the operator.
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