Wind velocity field during thunderstorms

Ponte, Jacinto Jr.,Riera, Jorge D. Techno-Press 2007 Wind and Structures, An International Journal (WAS Vol.10 No.3

Wind action is a factor of fundamental importance in the structural design of light or slender constructions. Codes for structural design usually assume that the incident mean wind velocity is parallel to the ground, which constitutes a valid simplification for frequent winds caused by meteorological phenomena such as Extratropical Storms (EPS) or Tropical Storms. Wind effects due to other phenomena, such as thunderstorms, and its combination with EPS winds in so-called squall lines, are simply neglected. In this paper a model that describes the three-dimensional wind velocity field originated from a downburst in a thunderstorm (TS) is proposed. The model is based on a semi empirical representation of an axially-symmetrical flow line pattern that describes a stationary field, modulated by a function that accounts for the evolution of the wind velocity with time. The model allows the generation of a spatially and temporally variable velocity field, which also includes a fluctuating component of the velocity. All parameters employed in the model are related to meteorological variables, which are susceptible of statistical assessment. A background wind is also considered, in order to account for the translational velocity of the thunderstorm, normally due to local wind conditions. When the translation of the TS is caused by an EPS, a squall line is produced, causing the highest wind velocities associated with TS events. The resulting vertical velocity profiles were also studied and compared with existing models, such as the profiles proposed by Vicroy, et al. (1992) and Wood and Kwok (1998). The present model predicts horizontal velocity profiles that depend on the distance to the storm center, effect not considered by previous models, although the various proposals are globally compatible. The model can be applied in any region of interest, once the relevant meteorological variables are known, to simulate the excitation due to TS winds in the design of transmission lines, long-span crossings, cable-stayed bridges, towers or similar structures.

Wind velocity field during thunderstorms

Jacinto Ponte Jr.,Jorge D. Riera 한국풍공학회 2007 Wind and Structures, An International Journal (WAS Vol.10 No.3

Wind action is a factor of fundamental importance in the structural design of light or slender constructions. Codes for structural design usually assume that the incident mean wind velocity is parallel to the ground, which constitutes a valid simplification for frequent winds caused by meteorological phenomena such as Extratropical Storms (EPS) or Tropical Storms. Wind effects due to other phenomena, such as thunderstorms, and its combination with EPS winds in so-called squall lines, are simply neglected. In this paper a model that describes the three-dimensional wind velocity field originated from a downburst in a thunderstorm (TS) is proposed. The model is based on a semi empirical representation of an axially-symmetrical flow line pattern that describes a stationary field, modulated by a function that accounts for the evolution of the wind velocity with time. The model allows the generation of a spatially and temporally variable velocity field, which also includes a fluctuating component of the velocity. All parameters employed in the model are related to meteorological variables, which are susceptible of statistical assessment. A background wind is also considered, in order to account for the translational velocity of the thunderstorm, normally due to local wind conditions. When the translation of the TS is caused by an EPS, a squall line is produced, causing the highest wind velocities associated with TS events. The resulting vertical velocity profiles were also studied and compared with existing models, such as the profiles proposed by Vicroy, et al. (1992) and Wood and Kwok (1998). The present model predicts horizontal velocity profiles that depend on the distance to the storm center, effect not considered by previous models, although the various proposals are globally compatible. The model can be applied in any region of interest, once the relevant meteorological variables are known, to simulate the excitation due to TS winds in the design of transmission lines, long-span crossings, cable-stayed bridges, towers or similar structures.

Recent Brazilian research on thunderstorm winds and their effects on structural design

Jorge D. Riera,Jacinto Ponte Jr. 한국풍공학회 2012 Wind and Structures, An International Journal (WAS Vol.15 No.2

Codes for structural design usually assume that the incident mean wind velocity is parallel to the ground, which constitutes a valid simplification for frequent winds caused by sypnoptic events. Wind effects due to other phenomena, such as thunderstorm downbursts, are simply neglected. In this paper, results of recent and ongoing research on this topic in Brazil are presented. The model of the threedimensional wind velocity field originated from a downburst in a thunderstorm (TS), proposed by Ponte and Riera for engineering applications, is first described. This model allows the generation of a spatially and temporally variable velocity field, which also includes a fluctuating component of the velocity. All parameters are related to meteorological variables, which are susceptible of statistical assessment. An application of the model in the simulation of the wind climate in a region sujected to both EPS and TS winds is discussed next. It is shown that, once the relevant meteorological variables are known, the simulation of the wind excitation for purposes of design of transmission lines, long-span crossings and similar structures is feasible. Complementing the theoretical studies, wind velocity records during a recent TS event in southern Brazil are presented and preliminary conclusions on the validity of the proposed models discussed.

Recent Brazilian research on thunderstorm winds and their effects on structural design

Riera, Jorge D.,Ponte, Jacinto Jr. Techno-Press 2012 Wind and Structures, An International Journal (WAS Vol.15 No.2

Codes for structural design usually assume that the incident mean wind velocity is parallel to the ground, which constitutes a valid simplification for frequent winds caused by sypnoptic events. Wind effects due to other phenomena, such as thunderstorm downbursts, are simply neglected. In this paper, results of recent and ongoing research on this topic in Brazil are presented. The model of the three-dimensional wind velocity field originated from a downburst in a thunderstorm (TS), proposed by Ponte and Riera for engineering applications, is first described. This model allows the generation of a spatially and temporally variable velocity field, which also includes a fluctuating component of the velocity. All parameters are related to meteorological variables, which are susceptible of statistical assessment. An application of the model in the simulation of the wind climate in a region sujected to both EPS and TS winds is discussed next. It is shown that, once the relevant meteorological variables are known, the simulation of the wind excitation for purposes of design of transmission lines, long-span crossings and similar structures is feasible. Complementing the theoretical studies, wind velocity records during a recent TS event in southern Brazil are presented and preliminary conclusions on the validity of the proposed models discussed.

라틴아메리카의 성 불평등과 구조적 간극

니콜 비데가인 폰테(Nicole Bidegain Ponte),조영실(번역자) 서울대학교 라틴아메리카연구소 2017 라틴아메리카이슈 Vol.- No.-

Interpretation of coastal wind transfer functions with momentum balances derived from idealized numerical model simulations

Kim, S. Y.,Gopalakrishnan, G.,Ponte, A. Springer Science + Business Media 2015 Ocean dynamics Vol.65 No.1

Metastatic Intrahepatic Cholangiocarcinoma Presenting as an Achalasia-like Syndrome

( Catarina Gomes ),( João Correia ),( Ana Ponte ),( Edgar Afecto ),( Rolando Pinho ),( João Carvalho ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2021 Journal of Neurogastroenterology and Motility (JNM Vol.27 No.3

Stent versus Balloon Dilation for the Treatment of Dominant Strictures in Primary Sclerosing Cholangitis: A Systematic Review and Meta-Analysis

Marina Tucci Gammaro Baldavira Ferreira,Igor Braga Ribeiro,Diogo Turiani Hourneaux de Moura,Thomas R. McCarty,Alberto Machado da Ponte Neto,Galileu Ferreira Ayala Farias,Antônio Afonso de Miranda Neto 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.6

Background/Aims: The endoscopic management of primary sclerosing cholangitis (PSC)-associated dominant strictures remainschallenging. This systematic review and meta-analysis aimed to compare balloon dilation and stent placement in the treatment ofdominant strictures among PSC patients. Methods: Literature searches on MEDLINE, EMBASE, Cochrane CENTRAL and Lilacs/Bireme were performed for studiespublished until December 2020. Measured outcomes included clinical efficacy, stricture recurrence, cumulative recurrencefree rate,transplant rate, 5-year survival rate, and adverse events (i.e., pancreatitis, cholangitis, bleeding, perforation and death). Results: A total of 5 studies (n=467) were included. Based on pooled analyses, there were no differences in clinical efficacy (riskdifference [RD], -0.13; 95% confidence interval [CI], -0.58 to 0.33; I2=93%) or transplant rates (RD, -0.09; 95% CI, -0.19 to 0.01;I2=0%); however, the risk of occurrence of adverse events was lower with balloon dilatation than with stent placement (RD,-0.34; 95% CI, -0.45 to -0.23; I2=61%). Among the types of adverse events reported, only the rates of cholangitis/bacteremia weresignificantly lower in balloon dilation patients (RD, -0.19; 95% CI, -0.25 to -0.13; I2=51%). Conclusions: Compared to balloon dilation, stent placement for dominant strictures in PSC appeared to have higher complicationrates without significant differences in efficacy.

La muerte enamorada. Amor y muerte en la literatura espa?ola de los siglos XVIII y XIX

Rafael Pontes Velasco 한국스페인어문학회 2005 스페인어문학 Vol.0 No.37

Entre las múltiples preocupaciones que los escritores españoles de los siglos XVIII y XIX abordaron en sus obras, cabe preguntarse por qué elegimos el estudio del "amor" y la "muerte". Sencillamente, porque la conjunción de estos dos conceptos implica una belleza equivalente a la armonía perfecta. Es decir, su unión indisoluble apunta a una suerte de compenetración cósmica, anhelada a lo largo de la historia de la Humanidad. La relación existente entre el amor y la muerte conlleva, en la mayor parte de las letras orientales y occidentales, la asunción de un orden primigenio y, con él, la posibilidad de otra vida fronteriza, anterior o posterior a la perceptible y conocida. Esa otra vida, enlazada íntimamente con la génesis literaria, trataremos de analizarla a través de la semántica profunda de los siguientes textos españoles de los siglos XVIII y XIX: Noches lúgubres (1774), de José Cadalso; Los amantes de Teruel (1836), de Juan Eugenio Hartzenbusch; El estudiante de Salamanca (1839), de José de Espronceda; El diablo mundo (1840), también de José de Espronceda; Don Juan Tenorio (1844), de José Zorrilla; y Rimas (1867), de Gustavo Adolfo Bécquer. El comentario de estas obras no se detendrá en el género literario de las mismas ni en sus peculiaridades formales. En cambio, adoptaremos una óptica centrada en los hallazgos de algunos de los libros más radicales a la hora de afrontar la comunión del amor y la muerte en la literatura, como Justine o los infortunios de la virtud (1791), del Marqués de Sade; Más allá del principio del placer (1920), de Sigmund Freud; El erotismo (1957), de Georges Bataille; y Pensamiento y cultura en la antigua India (1995), de Ana Agud.

El cine, Cagliostro y La generacion del 27

( Rafael Pontes Velasco ) 한국스페인어문학회 2007 스페인어문학 Vol.0 No.45