305,256 research outputs found
Construction of a drinking water supply network in Cances, Carballo
No full text[Resumen:] Antaño, varios vecinos de Cances, llegan a un acuerdo con otro vecino, para captar agua con destino a usos domésticos, en el manantial sito en un monte de su propiedad sito en la parroquia de Cances. Con el paso del tiempo, se fueron aumentando el número de viviendas quedando la red de distribución obsoleta, con fugas y pérdidas en partes de la red y roturas que se fueron arreglando (parches) con distintos materiales. Ante la falta de agua en sus domicilios y la ausencia de red de abastecimiento de aguas municipales en la parroquia de Cances y las necesidades de los habitantes en ese sentido, se hace necesario un estudio de la red para dar solución a esta problemática. El presente proyecto se plantea como una mejora de la red de abastecimiento de agua a Cances. Como resultado del estudio de alternativas la actuación propuesta consiste en un sistema de abastecimiento autónomo e independiente, captando el agua de un manantial sito en el monte vecinal. Se ha diseñado una red mallada de tal modo que, en medida de lo posible, el agua tenga más de un recorrido alternativo para llegar a cada punto de consumo y, de este modo en caso de eventual rotura o reparación, puedan seccionarse tramos reducidos sin interrumpir el suministro a las demás viviendas. Además, dicho sistema, cuenta con un depósito de regulación capaz de almacenar un volumen de agua que atienda a la demanda en horas punta, que consiste en una estructura de hormigón armado in situ de dimensiones interiores 11,00 x 5,50 metros en planta y 3 m de altura interior total. Este depósito se encuentra dividido interiormente en dos vasos simétricos de igual capacidad, de tal manera que se puedan realizar las operaciones pertinentes de mantenimiento, limpieza o reparación siempre manteniendo una de las cámaras en funcionamiento para no tener que interrumpir el servicio. Se encamina su actividad a un aprovechamiento racional y justo de las aguas, de conformidad con usos y costumbres.Traballo fin de grao (UDC.ETSECCP). Enxeñaría de Obras Públicas. Curso 2017/201
Evaluation of solvent effects in isotropic and anisotropic dielectrics, and in ionic solutions, with a unified integral equation method: theoretical bases, implementation and numerical applications
No full textThe IEF version of the PCM solvation method: an overview of a new method addressed to study molecular solutes at the QM ab initio level
No full textThe integral equation formalism (IEF) is a recent method (the grounds have been elaborated at the beginning of 1997) addressed to solve the electrostatic solvation problem at the QM level with the aid of apparent surface charges (ASC). IEF uses a new formalism of this problem, based on integral operators never used before in the chemical community and it manages to treat on the same footing linear isotropic solvent models, as well as anisotropic liquid crystals and ionic solutions. In this overview we emphasize the good performances of IEF at the lowest level of its potentialities, i.e. for isotropic solvents, as a new approach to compute solvation free energies and properties (dipole hyperpolarizabilities) of molecular solutes, as well as energy gradients for geometry optimization procedures. Finally we present a new IEF implementation of the nonequilibrium problem for electronic spectra which appears to be decidedly competitive with the previous more standard ASC formulations
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Geometric Optimization of Restricted-Open and Complete Active Space Self-Consistent Field Wave Functions
No full textWe explore Riemannian optimization methods for Restricted-Open-shell Hartree-Fock (ROHF) and Complete Active Space Self-Consistent Field (CASSCF) methods. After showing that ROHF and CASSCF can be reformulated as optimization problems on so-called “flag manifolds”, we review Riemannian optimization basics and their application to these specific problems. We compare these methods to traditional ones and find robust convergence properties without fine-tuning of numerical parameters. Our study suggests that Riemannian optimization is a valuable addition to orbital optimization for ROHF and CASSCF, warranting further investigation
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Author, publisher and bookseller : a tripartite synergy in Nigerian book industry
No full textThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
[Report to Chief J. E. Curry, by an unknown author #2]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
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