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.

Essential roles of bile acid receptors FXR and TGR5 as metabolic regulators

Sandra Jacinto,황성순 한국통합생물학회 2014 Animal cells and systems Vol.18 No.6

Alterations of bile acid (BA) metabolism in type II diabetes (T2D) have revealed a link between BAs and metabolichomeostasis. The BA receptors farnesoid X receptor (FXR) and G-protein coupled BA receptor 1 (TGR5) both have shownto regulate lipid, glucose, and energy metabolism, rendering them potential therapeutic targets for T2D therapy. Astonishingly, BA signaling is vital as it has known to be a positive factor for beneficial improvements in vertical sleevegastrectomy surgery, in turn making these BA receptors beneficial tools in therapeutic targets for T2D. These metabolicregulators: FXR and TGR5 are essential modulators in the metabolic system, which affect the human machinery and will bethe focus of this review.

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.

“Boiled Cat” by Kim Munsu

DANIEL JACINTO,Bruce Fulton,Ju-Chan Fulton 계명대학교 한국학연구원 2019 Acta Koreana Vol.22 No.1

압력에 따른 스프링클러 살수 분포 및 관개 효율 평가

가마자신토빈센트필립 ( Jacinto Vicente Filipe Gama ),홍성구 ( Seonggu Hong ) 한국농공학회 2020 한국농공학회 학술대회초록집 Vol.2020 No.-

Inadequate information about sprinklers especially in terms of coefficient uniformity and distribution uniformity is usually not given by the manufacturers, thus engineers are gettng into difficulty in correctly selecting appropriate sprinkler systems. The manufacturers provide the sprinkler specifications (throw or wetted radius of nozzle for different pressure, discharge volume, and precipitation for each nozzle). The main goal of this study is to evaluate water distribution uniformity, coefficient uniformity, and water application rates of a sprinkler system. The single sprinkler nozzl, HE-VAN of Rain bird^TM 15 series was evaluated through a set of experiments. The pressure is one of the most important factors that strongly affect irrigation uniformity and efficiency in a sprinkler irrigation system. The sprinklers were operated under different pressure and nozzle angle as recommended by the manufacture. The water depths were measured using catch cans which are located from the nozzle to the wetted radius for different pressures (1, 1.4, 1.7, and 2.1 bars) for 15 minutes. The results showed changes in both distribution coefficient and the coefficient of uniformity. The lowest coefficient uniformity (CU) and (DU) on nozzle 360°for the pressures 1.7 bar were 52% and 22%, respectively. The highest value of CU and DU were 70% and 34%, respectively at 1.4 bar. At the spray angles of 360°and 270°, higher water depth near to the nozzle and th depths decreased sharply along with the distance from the sprinkler. Meanwhile at the angles of 90°and 180°, higher water depths were located at 1.3 meters from the nozzle and then decreased at end of wetted radius. Wind influence affected distribution uniformity and coefficient uniformity. The results showed that irrigation engineers should take into serious consideration of the changes in the uniformity of water distribution by different pressures in designing and installation to achieve efficient irrigation.

Assessment of Irrigation Efficiency and Water Distribution by the Different Pressures and Nozzles angle of the Sprinkler Irrigation System

가마자신토빈센트필 ( Jacinto Vicente Filipe Gama ),홍성구 ( Seonggu Hong ) 한국농공학회 2020 한국농공학회 학술대회초록집 Vol.2020 No.-

Inadequate information about sprinklers especially in terms of coefficient uniformity and distribution uniformity is usually not given by the manufacturers, thus making an engineer difficult to correctly select a sprinkler. The manufacturers mention the sprinkler specifications (pressures for each nozzle with a radius of throwing wetted, discharge volume, and precipitation for each nozzle). The main goal of this study is to evaluate water distribution uniformity, coefficient uniformity, and water application rate surrounding a sprinkler on the single sprinkler. The single sprinkler Rain bird 15 series HE-VAN was evaluated under outdoor experimental conditions by measuring water depth. The pressure is one of the most important factors that strongly affect irrigation uniformity and efficiency in a sprinkler irrigation system. The sprinklers were operated under different pressure and nozzle angle as recommended by the manufacture. The Measurements of water depth using a catch can for sprinkler surroundings to the wetted radius have been done for different respective pressures (1bar, 1.4bar, 1.7 bar, and 2.1 bar) each within 15 minutes. The results show that the change in the distribution coefficient, the coefficient of uniformity change also. The lowest and highest coefficient uniformity (CU) and (DU) on nozzle 360°for the respecting pressure 1.7 bar & 1.4 bar is 22%, 52% of CU, and 70%,34% respectively. For the water application rate show that on 360° and 270° high water dept near to sprinkler and decreased sharply with the increasing distance from the sprinkler, while on 180° and 90°, high water dept increase in 1.3 meters from the sprinkler and then decrease at end of wetted area. Weather influence, causing low efficiency of distribution uniformity and coefficient uniformity. By this individual sprinkler evaluation, the irrigation system uniformity can be an input for an engineer to ensuring proper spacing is used in design and installation to meet the maximum irrigation efficiency.

Species distribution modeling for wildlife management: Ornamental butterflies in México

Jazmin Jacinto-Padilla,Jose Lopez-Collado,Catalino Jorge Lopez-Collado,Carlos Gilberto García-García 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.2

Butterflies are biotic natural resources that have an economic value in different countries because of their aesthetic features. The objective of this paper was to estimate the geographic distribution of 17 species considered of ornamental importance in México. Presence data was compiled from specialized sources and public databases. Distribution maps were generated for each species with MaxEnt, using predictor variables related to temperature and precipitation. A spatial similarity and species diversity analysis was applied to group the species based on their geographic distribution. The distribution models were considered appropriate based on the Area Under the Curve, which ranged from 0.75 to 0.94 computed with independent data. Three geographic groups were identified; the first group had the largest coverage (% of national area) and comprised the species Pyrisitia proterpia (59%), Danaus gilippus (70%) and Zerene cesonia (72%). The second group ranged in coverage from 23% (Archaeoprepona demophon) to 50% (Anteos maerula), while the third group had the smallest coverage, ranging from 17% to 40%. Overall, the species diversity presents a latitudinal gradient, increasing from the north to the southern, Neotropical part of México. States with the highest species potential are Veracruz, Tabasco, Colima, Michoacán, Guerrero, Chiapas, Oaxaca, and most of the Yucatan peninsula. The application of these results to use butterflies to make souvenirs and as components of ecotourism is discussed.

Women’s participation in fisheries management in small-scale fisheries in the Philippines

Harliqueen S. Jacinto 한국수산과학회 양식분과 2020 한국수산과학회 양식분과 학술대회 Vol.2020 No.7

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.