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modeling methods » models methods (Expander búsqueda), modern methods (Expander búsqueda), costing methods (Expander búsqueda)
flow » low (Expander búsqueda), flor (Expander búsqueda)
1
artículo
Publicado 2006
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An application of Computational Fluid Dynamics (CFD) using the Finite Element Method (FEN) for modeling the behavior of a 50 kW (Q = 120 l/s) Cross Flow Hydraulic Turbine is presented. H = 50 m and ω = 124.61 rad/s), with the objective of explaining in a numerical methodological way, the classical design principles and assumptions, as well as the search for their optimization. As results, pressure and velocity fields are obtained for different conditions (Q = 0 - 203.61 l/s, H = 9.40 - 580.71 m and ω = 25, 50, 100 and 125 rad/s) and regimes (laminar, transition and turbulent ) of operation, from which some indicators of turbine operation are quantified (distribution of velocity vectors in the intake section, efficiency and guideline injector coefficient, characteristic curves of the 50 kW turbine and of the unit turbine ). Finally, operating parameters of the turbine are projected for ...
2
artículo
Publicado 2020
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A finite element method (FEM) based tool is used in this work to numerically modeling mineral-slurry like flows in a 3D lid-driven cavity. Accordingly, the context in which the referred FEM based tool is being developed is firstly emphasized. Both mathematical and numerical models utilized here are described next. A special emphasis is put on the flow governing equations and the particular FEM weighted residuals approach (Galerkin method) used to solve these equations. Since mineral-slurry flows both featuring relatively low flow velocities and containing large amounts of solid particles can be accounted for as laminar non-Newtonian flows, only laminar flows are discussed here. Indeed both Newtonian and non-Newtonian laminar flows are numerically studied using a 3D lid-driven cavity at two different Reynolds numbers. Two rheological models, power-law and Carreau-Yasuda, are utilized in t...
3
artículo
In food technology, the consistency measurement of many thick or pasty products such as sauces or fruit or vegetable pastes is recorded. The problem in engineering lies in the design and construction of a flow device that allows evaluating the consistency of pasty or thick foods, for which it has actually been reformulated as an empirical flow channel device following the model of the “Bostwick consistometer” through the "Bostwick consistency", which is used by researchers to define technical terms, such as tomato sauce. The objective has been to design and build an instrument, where the thick or pasty food is released into a specially made channel and the distance that the food has slipped after a certain time interval is measured, usually 30 seconds; this gives the thick or pasty food “Bostwick consistency”, for example a tomato puree, B30 (Bostwick 30 seconds) can only be cons...
4
tesis doctoral
Publicado 2020
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También puede descargar la tesis en el repositorio institucional de la Pontifícia Universidade Católica do Rio de Janeiro: https://doi.org/10.17771/PUCRio.acad.49171
5
artículo
Publicado 2020
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Botnets are some of the most recurrent cyber-threats, which take advantage of the wide heterogeneity of endpoint devices at the Edge of the emerging communication environments for enabling the malicious enforcement of fraud and other adversarial tactics, including malware, data leaks or denial of service. There have been significant research advances in the development of accurate botnet detection methods underpinned on supervised analysis but assessing the accuracy and performance of such detection methods requires a clear evaluation model in the pursuit of enforcing proper defensive strategies. In order to contribute to the mitigation of botnets, this paper introduces a novel evaluation scheme grounded on supervised machine learning algorithms that enable the detection and discrimination of different botnets families on real operational environments. The proposal relies on observing, u...
6
tesis de grado
Publicado 2020
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Botnets are some of the most recurrent cyber-threats, which take advantage of the wide heterogeneity of endpoint devices at the Edge of the emerging communication environments for enabling the malicious enforcement of fraud and other adversarial tactics, including malware, data leaks or denial of service. There have been significant research advances in the development of accurate botnet detection methods underpinned on supervised analysis but assessing the accuracy and performance of such detection methods requires a clear evaluation model in the pursuit of enforcing proper defensive strategies. In order to contribute to the mitigation of botnets, this paper introduces a novel evaluation scheme grounded on supervised machine learning algorithms that enable the detection and discrimination of different botnets families on real operational environments. The proposal relies on observing, u...
7
artículo
Publicado 2019
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Debris flows are geophysical phenomena, caused by torrential rain, which occur in mountainous areas, characterized by the detachment of slope and riverbed materials and their consequent dislodge through watersheds and streams. Debris flows usually carry sludge, water and rocks, and can destroy everything in their path. On February 8th, 2019, an event of this type occurred and destroyed Mirave’s community in Peru, which was located in the areas of transport and deposition of debris flows. This research presents the modeling and numerical simulation to reproduce the transport and deposition processes of the debris flow that occurred in Mirave. The initiation process of the debris flow in streams was represented by hydrographs obtained from the estimated rain runoff volumes and solid materials found at each evaluated micro watershed. The numerical simulation results show acceptable result...
8
artículo
Publicado 2023
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This scientific article evaluates the prediction of hydrometeorological variables, which refer to temperature, precipitation, and flow. The applied methodology is long-term bidirectional recurrent neural networks (BRNN) in a series of 40 years of study for a better perspective on the climatological conditions in Metropolitan Lima until the year 2050. The BRNN model is formed by a single series of past observations, which means that the model analyzes one variable simultaneously to project the next value in the sequence, and unlike other LSTM models, the bidirectional model can model complex and long-time series of sequences efficiently. The purpose of the model is to divide the neurons of a regular RNN into 2 directions, one of them is for the positive time direction (forward states), and one is for the negative time direction (reverse states). In addition, mean square error (MSE), root ...
9
artículo
Publicado 2021
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The first case study, namely Evaluation of leakages in Peruvian mining tail deposits by the aid of radiotracers, corresponds to the evaluation of leakages in two tailing deposits have been performed in a Peruvian Mining Company, in Cusco-Peru, through the injection of tritiated water as a proper tracer, and the use of isotope and chemical techniques, in order to confirm the existence of filtrations in the neighborhood of such tailing deposits. The objective of the study was to establish a cause-effect mechanism between the two mineral tailing deposits and its corresponded influence area, as probably receipt bodies of contamination. As a result of the intensive operation, it was established a cause-effect mechanism between the deposits and its corresponded influence area as a receipt bodies of contamination by tailing elements. The second case study, namely ...
10
artículo
This research was conducted in the Hydrographic Region Titicaca, Peru. The main objective was to develop regional models of average monthly flows and persistence of the main rivers, applied to the problem of estimation of flows in basins without hydrometric registration. The climatic and physiographic characteristics of the basins under study were taken as independent variables and the mean monthly flows and persistence as a dependent variable. The methodology to identify homogeneous hydrological regions was made through the techniques of Ward and L-Moments. The regional equations were determined using potential regression models, the explanatory variables being the basin area and the length of the main river. The Nash-Sutcliffe (NSE) efficiency indicators and the root mean square error (RMSE) were used to assess the statistical significance of the regional models. The proposed regional ...
11
artículo
This research was conducted in the Hydrographic Region Titicaca, Peru. The main objective was to develop regional models of average monthly flows and persistence of the main rivers, applied to the problem of estimation of flows in basins without hydrometric registration. The climatic and physiographic characteristics of the basins under study were taken as independent variables and the mean monthly flows and persistence as a dependent variable. The methodology to identify homogeneous hydrological regions was made through the techniques of Ward and L-Moments. The regional equations were determined using potential regression models, the explanatory variables being the basin area and the length of the main river. The Nash-Sutcliffe (NSE) efficiency indicators and the root mean square error (RMSE) were used to assess the statistical significance of the regional models. The proposed regional ...
12
artículo
This research was conducted in the Hydrographic Region Titicaca, Peru. The main objective was to develop regional models of average monthly flows and persistence of the main rivers, applied to the problem of estimation of flows in basins without hydrometric registration. The climatic and physiographic characteristics of the basins under study were taken as independent variables and the mean monthly flows and persistence as a dependent variable. The methodology to identify homogeneous hydrological regions was made through the techniques of Ward and L-Moments. The regional equations were determined using potential regression models, the explanatory variables being the basin area and the length of the main river. The Nash-Sutcliffe (NSE) efficiency indicators and the root mean square error (RMSE) were used to assess the statistical significance of the regional models. The proposed regional ...
13
artículo
This research was conducted in the Hydrographic Region Titicaca, Peru. The main objective was to develop regional models of average monthly flows and persistence of the main rivers, applied to the problem of estimation of flows in basins without hydrometric registration. The climatic and physiographic characteristics of the basins under study were taken as independent variables and the mean monthly flows and persistence as a dependent variable. The methodology to identify homogeneous hydrological regions was made through the techniques of Ward and L-Moments. The regional equations were determined using potential regression models, the explanatory variables being the basin area and the length of the main river. The Nash-Sutcliffe (NSE) efficiency indicators and the root mean square error (RMSE) were used to assess the statistical significance of the regional models. The proposed regional ...
14
artículo
Publicado 2021
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The paper presents a methodology for the design of propeller and generator of a biomimetic hydraulic turbine, as well as an estimate of the electrical power generated for places with low-flow water inflows in the Mantaro Valley, Junín - Perú. The objective was to model the power generated by the biomimetic turbine when it is installed in irrigation channels of 0.8 x 0.8 m2, as a proposal for a micro-hydroelectric plant, an alternative generation with renewable energy, where the flow is at least 4 m3/s. For the verification of the design, a simulator of real conditions such as Computational Fluid Dynamics was used to predict the capacity the amount of force that acts on the movement axis based on the Finite Element Method, to verify the structural unity of the design. The design methodology is based on biomimetic technology, continuity equations, Reynolds Averaged Navier-Stokes Equation...
15
artículo
Publicado 2019
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The Shullcas River is born in the Chuspicocha and Lazo Untay lagoons located on the western ankof the Huaytapallana, it is the main source of water for human consumption in the city of Huancayo.The objective of the research work is to apply the Box - Jenkins, and Holt - Winters models forthe forecast of the monthly ows of the Shullcas river in the Chamisería station. The Holt -Wintersmultiplicative model is not applicable because the predicted monthly ows have a secular tendencyThe ARIMA model (1,0, 0)(2, 1, 1)12 is the most suitable for the forecast of monthly ows becausethey have the lowest value of the Akaike information criterion (0, 551)
16
artículo
Publicado 2019
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The Shullcas River is born in the Chuspicocha and Lazo Untay lagoons located on the western ankof the Huaytapallana, it is the main source of water for human consumption in the city of Huancayo.The objective of the research work is to apply the Box - Jenkins, and Holt - Winters models forthe forecast of the monthly ows of the Shullcas river in the Chamisería station. The Holt -Wintersmultiplicative model is not applicable because the predicted monthly ows have a secular tendencyThe ARIMA model (1,0, 0)(2, 1, 1)12 is the most suitable for the forecast of monthly ows becausethey have the lowest value of the Akaike information criterion (0, 551)
17
artículo
Publicado 2021
Enlace
Enlace
The first case study, namely Evaluation of leakages in Peruvian mining tail deposits by the aid of radiotracers, corresponds to the evaluation of leakages in two tailing deposits have been performed in a Peruvian Mining Company, in Cusco-Peru, through the injection of tritiated water as a proper tracer, and the use of isotope and chemical techniques, in order to confirm the existence of filtrations in the neighborhood of such tailing deposits. The objective of the study was to establish a cause-effect mechanism between the two mineral tailing deposits and its corresponded influence area, as probably receipt bodies of contamination. As a result of the intensive operation, it was established a cause-effect mechanism between the deposits and its corresponded influence area as a receipt bodies of contamination by tailing elements. The second case study, namely ...
18
artículo
Publicado 2020
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The investigation was carried out in the Huancané basin. The objective of the present work is the determination of the efficient method to calculate the potential evapotranspiration for a Rain-Runoff Model in the Huancané Basin - Puno region. The data used were from seven meteorological stations from periods 1964 to 2016 registered by the SENAMHI institution. To determine the most efficient method, nine potential evapotranspiration methods were proposed (tank type "A", Penman Monteith, Thornthwaite and Wilm, Hargreaves based on Temperature and Radiation, Oudin, Blaney and Criddle, Turc and Jensen - Haise), with different input variables: average temperature, minimum temperature, maximum temperature, wind speed, relative humidity, evaporation and hours of sunshine, for which it was carried out hydrological modeling with the nine methods of ETP. With the hydrological model GR2M that has ...
19
artículo
Publicado 2020
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The investigation was carried out in the Huancané basin. The objective of the present work is the determination of the efficient method to calculate the potential evapotranspiration for a Rain-Runoff Model in the Huancané Basin - Puno region. The data used were from seven meteorological stations from periods 1964 to 2016 registered by the SENAMHI institution. To determine the most efficient method, nine potential evapotranspiration methods were proposed (tank type "A", Penman Monteith, Thornthwaite and Wilm, Hargreaves based on Temperature and Radiation, Oudin, Blaney and Criddle, Turc and Jensen - Haise), with different input variables: average temperature, minimum temperature, maximum temperature, wind speed, relative humidity, evaporation and hours of sunshine, for which it was carried out hydrological modeling with the nine methods of ETP. With the hydrological model GR2M that has ...
20
artículo
Publicado 2020
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The investigation was carried out in the Huancané basin. The objective of the present work is the determination of the efficient method to calculate the potential evapotranspiration for a Rain-Runoff Model in the Huancané Basin - Puno region. The data used were from seven meteorological stations from periods 1964 to 2016 registered by the SENAMHI institution. To determine the most efficient method, nine potential evapotranspiration methods were proposed (tank type "A", Penman Monteith, Thornthwaite and Wilm, Hargreaves based on Temperature and Radiation, Oudin, Blaney and Criddle, Turc and Jensen - Haise), with different input variables: average temperature, minimum temperature, maximum temperature, wind speed, relative humidity, evaporation and hours of sunshine, for which it was carried out hydrological modeling with the nine methods of ETP. With the hydrological model GR2M that has ...
