Cálculo directo del coeficiente de mayoración

In this paper explicit formulae are obtained for the calculation of the factor of safety in reinforced concrete structures. These formula are based on the principle of minimum generalised cost, in agreement with the method proposed in the «Instrucción H.A. 61 para el Cálculo de Estructuras de Hormigón Armado» (2nd and 3rd parts), published by the Institute Eduardo Torroja, Madrid, 1961. Consequently they provide results similar to those of this H.A.61 Instruction, avoiding the need to undertake trial and error methods. To obtain the formula, approximate analytical expressions of the cost of the structure, and of its probability of failure, are first worked out, as fimctions of the factor of safety. In the paper, numerical examples are also worked out. This paper is a revised summary of the article «The Factor of Safety in Reinforced Concrete Structures», by J. H. Hernández, «Revista de Ingeniería Civil», Havana, 1965.Se obtienen fórmulas explícitas para el cálculo del coeficiente de mayoración en estructuras de hormigón armado. Dichas fórmulas se basan en el principio del coste generalizado mínimo, al igual que el método propuesto en la «Instrucción H.A. 61 para el Cálculo de Estructuras de Hormigón Armado» (2.ª y 3.ª partes), del Instituto Eduardo Torroja, Madrid (1961), y permiten, por tanto, llegar a resultados similares a los de este último, sin necesidad de tanteos. Para deducir las fórmulas, se obtienen previamente expresiones analíticas aproximadas del coste de la estructura resistente y de su probabilidad de hundimiento, como funciones del coeficiente de seguridad. Se resuelven ejemplos numéricos ilustrativos. Este trabajo es un resumen revisado del artículo «El Coeficiente de Seguridad en Estructuras de Hormigón Armado», por J. E. Hernández, Revista Ingeniería Civil, La Habana (1965)

Cálculo directo del coeficiente de mayoración

In this paper explicit formulae are obtained for the calculation of the factor of safety in reinforced concrete structures. These formula are based on the principle of minimum generalised cost, in agreement with the method proposed in the «Instrucción H.A. 61 para el Cálculo de Estructuras de Hormigón Armado» (2nd and 3rd parts), published by the Institute Eduardo Torroja, Madrid, 1961. Consequently they provide results similar to those of this H.A.61 Instruction, avoiding the need to undertake trial and error methods. To obtain the formula, approximate analytical expressions of the cost of the structure, and of its probability of failure, are first worked out, as fimctions of the factor of safety. In the paper, numerical examples are also worked out. This paper is a revised summary of the article «The Factor of Safety in Reinforced Concrete Structures», by J. H. Hernández, «Revista de Ingeniería Civil», Havana, 1965.<br><br>Se obtienen fórmulas explícitas para el cálculo del coeficiente de mayoración en estructuras de hormigón armado. Dichas fórmulas se basan en el principio del coste generalizado mínimo, al igual que el método propuesto en la «Instrucción H.A. 61 para el Cálculo de Estructuras de Hormigón Armado» (2.ª y 3.ª partes), del Instituto Eduardo Torroja, Madrid (1961), y permiten, por tanto, llegar a resultados similares a los de este último, sin necesidad de tanteos. Para deducir las fórmulas, se obtienen previamente expresiones analíticas aproximadas del coste de la estructura resistente y de su probabilidad de hundimiento, como funciones del coeficiente de seguridad. Se resuelven ejemplos numéricos ilustrativos. Este trabajo es un resumen revisado del artículo «El Coeficiente de Seguridad en Estructuras de Hormigón Armado», por J. E. Hernández, Revista Ingeniería Civil, La Habana (1965)

(X)querying RSS/Atom Feeds Extracted from News Web Sites: a Cocoon-based Portal

Abstract. The Web is fastly becoming the predominant source for news and information for many people. In the past few years, a new delivery system has emerged in the form of RSS feeds. Such feeds normally provide a brief of a larger news posted on the Web. RSS feeds, collected to form “channels ” according to some thematic criteria, can be accessed using Web browsers or specialized software called “news aggregators”. Even so, the amount of information available on the Web still exceeds human possibilities. In order to allow more selective and precise user choice, we developed a Web Cocoon-based platform which selects and publishes news gathered from various news Web sites. The selection is done submitting XQuery queries to a local repository and exploits the intrinsically semantic nature of RSS feeds. 1 Introduction an

An unusual complicated polypectomy and inverted colonic diverticula

[No abstract available

Rifaximin improves symptoms of acquired uncomplicated diverticular disease of the colon.

BACKGROUND AND AIMS: We examined the efficacy of cyclic long-term administration of rifaximin, a broad spectrum, poorly absorbable antibiotic, in obtaining symptom relief in a large series of patients with uncomplicated diverticular disease, and compared the incidence of episodes of diverticulitis in the group treated with rifaximin to that in a group receiving fiber supplementation only. PATIENTS AND METHODS: In a multicenter, prospective, open trial, 968 outpatients with uncomplicated symptomatic diverticular disease were randomized to either fiber supplementation with 4 g/day glucomannan plus 400 mg rifaximin twice daily for 7 days every month ( n=558) or 4 g/day glucomannan alone ( n=346). Clinical evaluation was performed on admission and at 4-month intervals for 12 months. RESULTS: After 12 months the group treated with glucomannan + rifaximin showed fewer symptoms (abdominal pain/discomfort, bloating, tenesmus, diarrhea, abdominal tenderness) and a lower global symptomati

Local occurrence and fast spread of B.1.1.7 lineage: A glimpse into Friuli Venezia Giulia

In-depth study of the entire SARS-CoV-2 genome has uncovered many mutations, which have replaced the lineage that characterized the first wave of infections all around the world. In December 2020, the outbreak of variant of concern (VOC) 202012/01 (lineage B.1.1.7) in the United Kingdom defined a turning point during the pandemic, immediately posing a worldwide threat on the Covid-19 vaccination campaign. Here, we reported the evolution of B.1.1.7 lineage-related infections, analyzing samples collected from January 1st 2021, until April 15th 2021, in Friuli Venezia Giulia, a northeastern region of Italy. A cohort of 1508 nasopharyngeal swabs was analyzed by High Resolution Melting (HRM) and 479 randomly selected samples underwent Next Generation Sequencing analysis (NGS), uncovering a steady and continuous accumulation of B.1.1.7 lineage-related specimens, joined by sporadic cases of other known lineages (i.e. harboring the Spike glycoprotein p.E484K mutation). All the SARS-CoV-2 genome has been analyzed in order to highlight all the rare mutations that may eventually result in a new variant of interest. This work suggests that a thorough monitoring of the SARS-CoV-2 genome by NGS is essential to contain any new variant that could jeopardize all the efforts that have been made so far to resolve the emergence of the pandemic

An unusual treatment for a colonic polyp

[No abstract available