oalib

OALib Journal期刊

ISSN: 2333-9721

费用:600人民币/ 99美元

投稿

时间不限

2017 ( 15 )

2016 ( 59 )

2015 ( 588 )

2014 ( 819 )

自定义范围…

匹配条件: “Ricardo Mario Amé” ,找到相关结果约33395条。
列表显示的所有文章,均可免费获取
第1页/共33395条
每页显示
Localized Tension Produced by Combined Geometric Discontinuities Tensiones localizadas producidas por discontinuidades geométricas combinadas
Ricardo Mario Amé,Gabriel María Dasso,Daniel Lezama
Revista Cubana de Ingeniería , 2011, DOI: 10.1234/rci.v2i2.49
Abstract: Many mechanical components especially those in machinery and of steel structures are designed with various forms which may include section changes, holes, threaded parts, keyways or multiple discontinued geometrical elevations that produce localized stresses. Often, the over lapping of two or more discontinuities in the same section or in very close sections is observed and this over lapping makes it very difficult to determine the value of the localized tension.In this present work, ABAQUS software is applied to determine the increased localized tension insections having more than one geometric discontinuity and helpful elaborated graphs are developed for practical purposes in simple mechanical design. However, this analysis is limited to geometric discontinued structures with slots of macroscopic dimensions. First a test run is carried out using the software on already verified situations accepted in the given literature so as to validate the method, after which the software is applied to a Hub of combined generic geometric designs in flat, symmetrical and with axial loads pieces. It is shown that the software is relevant because it verifies those tested Kt values offered by the commonly recognized literature. Results of the combined discontinuities are then obtained and represented by means of a graph which in the future will be useful in mechanical design. It can be concluded that the available information in the literature about combined geometric concentrators is limited and in some cases incur doubts. Now, values for complex designs can be obtained as a result of the availability of these software tools. In addition, the making of graphics using the results obtained from the application of such software is more practical which in return has improved the efficiency of designs. Los componentes mecánicos, especialmente en máquinas y estructuras metálicas, se dise an con formas diversas que incluyen cambios de sección, agujeros, zonas roscadas, chaveteros y múltiples discontinuidades geométricas que producen elevaciones localizadas de las tensiones. En muchas oportunidades se presenta la superposición de dos o más discontinuidades en una misma sección o en secciones muy cercanas dificultando la determinación del valor de la tensión localizada. En el presente trabajo se aplica el software ABAQUS a la determinación del incremento localizado de tensiones en secciones con más de una discontinuidad geométrica. Se elaboran gráficos de utilización simple a los fines prácticos del dise o mecánico. El análisis de casos se limita a cuerpos con discontinuidades
Notas sobre el endeudamiento externo en Argentina y Brasil: neoliberalismo y crisis
Lazzari,Ricardo; Rapoport,Mario;
Ciclos en la historia, la econom?-a y la sociedad , 2012,
Abstract: the increasing levels of international liquidity accumulated in the second half of the 70s laid the foundations for a new phase in the external debt cycles of latin-american countries. beyond their common features, those processes recognize a singular trajectory in each of the latin-american economies, essentially determined by the productive structures of these countries, their historical particular forms of capital accumulation, the strategies of their ruling classes, and also the alliances that they established with the foreign financial capital. the present article carries out a comparative historical analysis of the external indebtedness processes in argentina and brazil under the predominance of neo-liberalism, indicating the place that foreign debt had in the dynamics of capital accumulation in this period, and which have been its results.
Groundwater resources in the State of S?o Paulo (Brazil): the application of indicators
Hirata, Ricardo;Suhogusoff, Alexandra;Fernandes, Amélia;
Anais da Academia Brasileira de Ciências , 2007, DOI: 10.1590/S0001-37652007000100016
Abstract: indicators, for groundwater resources, have mostly been employed to define the present status and the degradation tendency, regarding both quantity (under- or overexploitation) and quality (natural and anthropic contamination). this work presents the application of indicators in order to draw a picture of the groundwater resources situation in the 22 water resource management units (wrmu) of the state of s?o paulo. the seven indicators (i1 to i7) applied provide a general overview of groundwater dependence (i1, i2), availability (i3, i4), and quality (i5, i6, i7). considering public supply (indicator 1), one observes that 9 wrmus show high (>50% of the population supplied by groundwater), 6, intermediate (49-25%), and 7, low (<24%) dependence on groundwater. indicators 3 and 4 show that the resource still presents a great potential for further abstractions in most of the wrmus, although there is evidence of overexploitation in the upper tietê, turvo/grande, and pardo basins, and low availability in the upper tietê, piracicaba/capivari/jundiai, and turvo/grande. indicator 5 (aquifer natural vulnerability) denotes that the wrmus 2, 4, 8, 13, 14 and 18-22 (part of the recharge area of guarani aquifer system) need more attention mainly where large contaminant loads are present. indicator 6 shows the general excellent natural quality of groundwater, although it also denotes that 3 wrmus need special consideration due to chromium and fluoride contamination. indicator 7 demonstrates a close relationship between groundwater contamination occurrence and density/type of land occupation.
Tegafur-induced acral hyperpigmentation
Vera Teixeira,Ricardo Vieira,Américo Figueiredo
Dermatology Reports , 2011, DOI: 10.4081/dr.2011.e30
Abstract: Tegafur is a prodrug of 5-fluorouracil (5-FU) with a similar spectrum of antitumor activity. It is used in the treatment of advanced gastrointestinal neoplasms. Over 5-FU, tegafur has the advantage of oral administration and less hematologic toxicity. Gastrointestinal toxicity is its main dose-limiting factor. The cutaneous adverse effects of tegafur include mucositis, photosensitivity, diffuse or nail-restricted hyperpigmentation, palmoplantar erythrodysesthesia syndrome, palmoplantar keratoderma, sclerodactyly and Raynaud phenomenon. We report here the case of a patient who developed acral hyperpigmentation during treatment with tegafur.
Prevalencia y persistencia del insomnio crónico estudio SUECA II
Díaz,Ricardo; Ruano,Mario Iván;
Acta Medica Colombiana , 2011,
Abstract: introduction: insomnia, especially when it becomes chronic, it becomes a disease with marked implications for physical and mental health. despite its importance, in our country there are few population studies on the epidemiological pattern. previous studies in the department of caldas showed a high overall prevalence of insomnia with figures around 47%. objective: to establish the frequency, demographic characteristics and persistence to two years of chronic insomnia in a population sample representative of the city of manizales. subjects and methods: a cross-sectional household interviews in different socioeconomic levels in subjects over 18 years, complaining of insomnia in the previous study of sleep disorders in caldas (2008) that included 530 people of which 228 were insomnia (acute or chronic), yielding an overall prevalence of 43.9%. for data analysis we used the statistical package epiinfo 6.04 /. results: the 2-year follow-up could be performed and of these 218 people remained in 175 insomnia, which indicated a prevalence of chronic insomnia of 33% and a persistence of the same of 80.2%. when only considered daytime consequences of the insomnia, the prevalence was 10.9%. in more than half of those insomnia had been present between five and ten years. increasing age was the only factor associated to a higher frequency. despite the persistence and severity of insomnia, only 18.3% had reported to the doctor. conclusions: the overall prevalence of insomnia, chronic and daytime impact are found within the ranges reported in the literature and found a high persistence and duration of chronic insomnia. above, and given its negative consequences on individuals and communities, warrants an active search for this condition in clinical practice and appropriate government measures for its prevention and management (acta med colomb 2011; 36: 119-124).
PANDORA - INIA, NUEVO CULTIVAR DE TRIGO HARINERO DE PRIMAVERA PARA CHILE
Mellado Z.,Mario; Madariaga B.,Ricardo;
Agricultura Técnica , 2003, DOI: 10.4067/S0365-28072003000300011
Abstract: pandora - inia is a spring wheat (triticum aestivum l.) cultivar created by the wheat project at quilamapu regional research center of the national agricultural research institute (inia), chillán, chile, starting from a cross made in 1989. it is a semi-dwarf wheat with a plant height of 90 - 95 cm. the grain is brown and with an ovate shape. the spike is white and bearded. in trials its grain yield has varied between 7.5 and 10.8 t ha-1. the average bread volume, sedimentation value and grain protein were 722 cm3, 41.6 cm3, and 11.1% respectively, which classified this cultivar for direct use in bread making.
Modulation by context of a scene in monkey anterior inferotemporal cortex during a saccadic eye movement task
LIMA, BRUSS;FIORANI, MARIO;GATTASS, RICARDO;
Anais da Academia Brasileira de Ciências , 2003, DOI: 10.1590/S0001-37652003000100008
Abstract: we investigated the effect of a scene on the activity of cells in the anterior inferotemporal (ait) cortex while the monkey performed a saccadic eye movement (sem) task with and without the context of a scene (gray frame). most neurons did not code for the presence of a scene when it appeared alone (monkey free viewing) or when the monkey was fixating. nevertheless, when a peripheral target was turned on and the monkey had to make a sem to it, some cells were capable of differentially coding the presence of the scene before and after the saccade.
A radiographic method to estimate lung volume and its use in small mammals
CANALS,MAURICIO; OLIVARES,RICARDO; ROSENMANN,Mario;
Biological Research , 2005, DOI: 10.4067/S0716-97602005000100006
Abstract: in this paper we develop a method to estimate lung volume using chest x-rays of small mammals. we applied this method to assess the lung volume of several rodents. we showed that a good estimator of the lung volume is: v*l = 0.496 · vrx ≈ 1/2·vrx , where vrx is a measurement obtained from the x-ray that represents the volume of a rectangular box containing the lungs and mediastinum organs. the proposed formula may be interpreted as the volume of an ellipsoid formed by both lungs joined at their bases. when that relationship was used to estimate lung volume, values similar to those expected from allometric relationship were found in four rodents. in two others, m. musculus and r. norvegicus, lung volume was similar to reported data, although values were lower than expected.
Infarto Agudo de Miocardio: Certezas e Incertidumbres con las Nuevas Estrategias de Reperfusión
Iglesias,Dr. Ricardo Mario; Lescano,Dr. Adrian;
Revista Costarricense de Cardiología , 2007,
Abstract: the first cause of morbidity-mortality all over the world is represented by the cardiovascular diseases. the acute infarct of myocardium is the most dramatic expression within the acute coronary syndrome and the coronary plaque rupture, the most frequently physiopathology mechanism involved. in the last few years the objective of the treatment has changed, from obtaining permeability in the epicardial arteries to reaching a suitable level of perfusion in the microvascular circuit. the optimization of the therapeutic strategy obtains through a precocious and effective reperfusion (fibrinolytic and/or angioplasty) and the suitable helping drug selection (aspirin, clopidogrel and anticoagulants) that has demonstrated clinical benefits in clinical trials
Los flavonoides en la terapia cardiovascular.
Russo,Ricardo O; Speranza Sánchez,Mario;
Revista Costarricense de Cardiología , 2006,
Abstract: flavonoids are 15-carbon phenolic compounds generally distributed throughout the plant kingdom in more than 2.000 species identified. due to their antioxidant and free radical-scavenging properties, these substances are considered helpful in the preventive therapy in heart diseases.
第1页/共33395条
每页显示


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