oalib

OALib Journal期刊

ISSN: 2333-9721

费用:600人民币/ 99美元

投稿

时间不限

2017 ( 12 )

2016 ( 33 )

2015 ( 307 )

2014 ( 475 )

自定义范围…

匹配条件: “Salvador La Malfa” ,找到相关结果约14931条。
列表显示的所有文章,均可免费获取
第1页/共14931条
每页显示
The Numerical and Experimental Analysis of Concrete Bridges of Different Typologies Análisis numérico y experimental de puentes de hormigón de diferentes tipologías
Leonel Osvaldo Pico,María Haydeé Peralta,Norma Luján Ercoli,Salvador La Malfa
Revista Cubana de Ingeniería , 2011, DOI: 10.1234/rci.v2i1.38
Abstract: The increase in vehicular load and velocity over the years has prompted the need for structural modifications of concrete bridges. The measurements and analysis of vibrations in situ along with numerical techniques aid in the global evaluation of these structures by obtaining the dynamic characteristics and corresponding response. These measurements are then compared to international standards and codes in order to formulate superior concrete bridges with the objective of obtaining the influence of the difference in typology on the behavior of bridges. Bridge 1 uses a two way system with beams and deck slabs and bridge 2 is a superior structure composed of pretension T beams and situ-cast concrete deck. These findings are fundamental references in the designing of bridges. El incremento de las cargas y de las velocidades de circulación vehicular de los últimos a os provoca una modificación en el comportamiento estructural de puentes de hormigón entre 30 y 50 a os de vida en servicio. Se originan problemas que no solo se relacionan con la seguridad estructural sino también con el confort, lo cual motiva la necesidad de un monitoreo y evaluación de su comportamiento estructural. La medición y análisis de vibraciones in situ, junto con el uso de técnicas numéricas, permiten realizar la evaluación global de dichas estructuras, a partir de la obtención de las características dinámicas y respuesta correspondiente. Los resultados de las mediciones efectuadas se comparan con normas y criterios actuales existentes a nivel internacional.En el presente trabajo se evalúan dos puentes de hormigón de tablero superior correspondientes a tipologías estructurales diferentes, en un caso emparrillado de vigas y losas llenas y en el otro vigas de hormigón pretensadas tipo doble T y losas llenas hormigonadas in situ, con el objetivo de determinar la influencia de las tipologías en el comportamiento estructural. Los análisis efectuados permiten arribar a conclusiones sobre la relación entre la respuesta estructural y la tipología estructural correspondiente, de interés para el dise o y/o evaluación de puentes.
HOW HEARING AND HEARING-IMPAIRED CHILDREN DIFFERENTIATE EMERGENT WRITING FROM DRAWING
BARBARA ARFé,SILVIA D’AMBROSIO,SARA LA MALFA
L1 Educational Studies in Language and Literature , 2010,
Abstract: This study compared Italian hearing-impaired and hearing preschoolers' conceptions about writing, by examininghow they differentiate writing from drawing. The relationship between emergent writing and verbal languagewithin the two groups was also considered. Twenty-three orally educated hearing-impaired children from 2 yearsand 10 months to 6 years of age, and 23 hearing controls, matched to the hearing-impaired participants for age,took part in this study. Children were asked to write and draw, to classify their products as writing or drawing,and to recognize what they had drawn or written. Results suggest that hearing children have an earlier understandingof the two notational forms (writing and drawing) and are able to differentiate the traits of the twosymbolic systems earlier than hearing-impaired children. This understanding and the discrimination between thetwo different notational forms could be challenging for orally educated hearing-impaired children. However,once they have differentiated writing from drawing, hearing-impaired children can even develop more preciseand stable writing representations than their hearing counterparts. Verbal language seems to be a relevant variablein this construction process.
Short report: autistic gastrointestinal and eating symptoms treated with secretin: a subtype of autism
Pallanti Stefano,Lassi Stefano,La Malfa Giampaolo,Campigli Marco
Clinical Practice and Epidemiology in Mental Health , 2005, DOI: 10.1186/1745-0179-1-24
Abstract: Pervasive Developmental Disorders (PDD) are chronic, lifelong disorders for which there is as yet no effective cure, and medical management remains a challenge for clinicians. The current report describes two patients affected by autistic disorder with associated gastrointestinal symptoms. They received multiple doses of intravenous secretin for a six-month period and were assessed with several specific outcome measures to evaluate drug effect. The administration of secretin led to some significant and lasting improvement in only one case. Gastroesophageal reflux may contribute to some of the behavioural problems and explain the effect of secretin since its suppressive effect on gastric secretion is well known. It is also true that autistic children with gastroesophageal reflux and a higher IQ could constitute a subtype which responds to secretin administration and that could be labelled as a "gastrointestinal subtype".
High Resolution Melting Analysis Is a More Sensitive and Effective Alternative to Gel-Based Platforms in Analysis of SSR – An Example in Citrus
Gaetano Distefano, Marco Caruso, Stefano La Malfa, Alessandra Gentile, Shu-Biao Wu
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0044202
Abstract: High resolution melting curve analysis (HRM) has been used as an efficient, accurate and cost-effective tool to detect single nucleotide polymorphisms (SNPs) or insertions or deletions (INDELs). However, its efficiency, accuracy and applicability to discriminate microsatellite polymorphism have not been extensively assessed. The traditional protocols used for SSR genotyping include PCR amplification of the DNA fragment and the separation of the fragments on electrophoresis-based platform. However, post-PCR handling processes are laborious and costly. Furthermore, SNPs present in the sequences flanking repeat motif cannot be detected by polyacrylamide-gel-electrophoresis based methods. In the present study, we compared the discriminating power of HRM with the traditional electrophoresis-based methods and provided a panel of primers for HRM genotyping in Citrus. The results showed that sixteen SSR markers produced distinct polymorphic melting curves among the Citrus spp investigated through HRM analysis. Among those, 10 showed more genotypes by HRM analysis than capillary electrophoresis owing to the presence of SNPs in the amplicons. For the SSR markers without SNPs present in the flanking region, HRM also gave distinct melting curves which detected same genotypes as were shown in capillary electrophoresis (CE) analysis. Moreover, HRM analysis allowed the discrimination of most of the 15 citrus genotypes and the resulting genetic distance analysis clustered them into three main branches. In conclusion, it has been approved that HRM is not only an efficient and cost-effective alternative of electrophoresis-based method for SSR markers, but also a method to uncover more polymorphisms contributed by SNPs present in SSRs. It was therefore suggested that the panel of SSR markers could be used in a variety of applications in the citrus biodiversity and breeding programs using HRM analysis. Furthermore, we speculate that the HRM analysis can be employed to analyse SSR markers in a wide range of applications in all other species.
Comparative transcriptome analysis of stylar canal cells identifies novel candidate genes implicated in the self-incompatibility response of Citrus clementina
Marco Caruso, Paz Merelo, Gaetano Distefano, Stefano La Malfa, Angela Lo Piero, Francisco R Tadeo, Manuel Talon, Alessandra Gentile
BMC Plant Biology , 2012, DOI: 10.1186/1471-2229-12-20
Abstract: The transcriptome profiling of SCC indicated that the differential regulation of few specific, mostly uncharacterized transcripts is associated with the breakdown of self-incompatibility in 'Monreal'. Among them, a novel F-box gene showed a drastic up-regulation both in laser microdissected stylar canal cells and in self-pollinated whole styles with stigmas of 'Comune' in concomitance with the arrest of pollen tube growth. Moreover, we identify a non-characterized gene family as closely associated to the self-incompatibility genetic program activated in 'Comune'. Three different aspartic-acid rich (Asp-rich) protein genes, located in tandem in the clementine genome, were over-represented in the transcriptome of 'Comune'. These genes are tightly linked to a DELLA gene, previously found to be up-regulated in the self-incompatible genotype during pollen-pistil interaction.The highly specific transcriptome survey of the stylar canal cells identified novel genes which have not been previously associated with self-pollen rejection in citrus and in other plant species. Bioinformatic and transcriptional analyses suggested that the mutation leading to self-compatibility in 'Monreal' affected the expression of non-homologous genes located in a restricted genome region. Also, we hypothesize that the Asp-rich protein genes may act as Ca2+ "entrapping" proteins, potentially regulating Ca2+ homeostasis during self-pollen recognition.Among the citrus species, several pummelos (Citrus grandis L. Osbeck) and mandarin-like varieties are self-incompatible [1]. Clementine mandarin (Citrus clementina Hort. ex Tan.), derived from an uncontrolled cross between a sweet orange and a mandarin, is probably the most widespread citrus species showing self-incompatibility (SI). It is characterized by gametophytic SI, with the pollen tubes stopping their growth in the upper or middle style [2,3]. Moreover, in this species SI is coupled with a variable degree of parthenocarpy. SI and parthenocarpy
El área metropolitana de Buenos Aires.
Cristina Malfa del Grosso
Urbano , 2004,
Abstract:
Intervención en barrios patrimoniales. Plan de manejo del casco histórico de Buenos Aires, San Telmo-Monserrat y su entorno
Cristina Beatriz Malfa
Urbano , 2004,
Abstract:
El transporte urbano en la Región Metropolitana de Buenos Aires, Argentina
Cristina Beatriz Malfa Del Grosso
Urbano , 2003,
Abstract: El objetivo de este trabajo consiste en el análisis de la oferta actual del transporte urbano en la Region metropolitana de Buenos Aires, en el marco de las concesiones otorgadas a empresas privadas, de los servicios públicos de transporte, tratando de evaluar las políticas y modalidades de regulación y gestión aplicadas desde el Estado y centrando la mirada en los efectos y consecuencias de esta modalidad, sobre el conjunto social involucrado y sobre el territorio. Se presentará un panorama general de la situación del sistema de transporte y circulación urbana a modo de síntesis diagnostica, que incluye las características mas significativas movilidad, los distintos modos de transportación, los procesos de concesión de la red de accesos a la ciudad madre, del transporte publico, tanto automotor como ferroviario de pasajeros y de las nuevas modalidades que incrementaron la oferta. Asimismo en el contexto de la Reforma del Estado, - privatizaciones y concesiones-, se incorporaran algunas reflexiones haciendo hincapié en los impactos que estos procesos provocaron en lo social, espacial-económico y ambiental, y que favorecieron el recrudecimiento de la exclusión y fractura social, y la fragmentación territorial, fenómenos ocurridos de manera general en todas las ciudades latinoamericanas sin distinción de niveles de jerarquía urbana o límites jurisdiccionales pero recortando espacialmente el estudio en la Region metropolitana de Buenos Aires.. Toda la reflexión se apoya en el marco del enfoque sistémico, partiendo de considerar que la realidad es compleja y multidimensional y que su naturaleza no es unívoca, que los elementos que la constituyen están interrelacionados entre si, por lo que existen múltiples relaciones ínter- temáticas e ínter escalares.
Analysis of the scientific production of olive products. I – Table olives
Salvador, Javier,Fernández, Elena,de la Viesca, Rosa
Grasas y Aceites , 2007,
Abstract: This article contains an overview of the scientific production in the area of table olives during the period 2000- 2005. Authora€ s productivity, most relevant topics, sources of information and groups of authors are analysed using basic bibliometric indicators. Also, contributions and collaborations among groups of authors are studied. Finally, this work includes impact indicators from the most important journals on this topic. Este artículo presenta un panorama de la producción científica en el área de las aceitunas de mesa durante el periodo 2000-2005. Utilizando indicadores bibliométricos básicos, se ha estudiado la productividad de los autores, los temas más comúnmente tratados, las fuentes de información y los grupos de autores. Además, se analizan las colaboraciones realizadas entre diferentes grupos de investigación. Por último, se incluyen los indicadores de impacto de las revistas más prestigiosas en el sector.
Resistivity Measurements on Bulk Bi2Sr2CaCu2O8+δ: Contribution of Vortices at Low Magnetic Fields
Clarina de la Cruz,Leandro Guerra,Roland Sarmago,Arnel Salvador
Science Diliman , 1999,
Abstract: The behavior of high-temperature superconductors in the presence of an external magnetic field is of particular interest in light of its technological application and commercialization. In this paper, we performed resistivity measurements on bulk superconducting pellets of Bi2Sr2CaCu2O8+δ in the presence of external magnetic fields below 0.5T. The broadening of the transition region below Tc in the resistivity plots, was attributed to the residual resistance imparted by flux flow in the sample. From I-V measurements at 50 K at fields below 0.6T, the contribution of vortices was quantitatively measured as a flux flow resistivity which range from 0.1231 to 1.700 (m(-mm) for applied magnetic fields from 0.04T to 0.6T. The increase in the flux flow resistivity with increasing applied field was due to the increase in the number of vortices moving in steady state motion brought about by the interaction of the vortices with the transport current.
第1页/共14931条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.