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1,481 results on '"Martinez, Roberto"'

1. Data-Driven Model For Heat Load Prediction In Buildings Connected To District Heating Networks

Author

Hajri, Alaeddine, Garay-Martinez, Roberto, Macarulla, Ana Maria, and Sassi, Mohamed Amin Ben

Subjects
Statistics - Applications
Abstract

In this study we investigate the heat load patterns in one building using multi-step forecasting model. We combine the Autoregressive models that use multiple eXogenous variables (ARX) with Seasonally adaptable Time of Week and Climate dependent models (S-TOW-C) (to correct model inaccuracies), to obtain a robust and accurate regression model that we called S-TOW-C-ARX used in time series forecasting. Based on the experiment results, it has been shown that the proposed model is suitable for short term heat load forecasting. The best forecasting performance is achieved in winter term where the prediction values are from 4 to 20 % away from the targets, which are commonly seen as very good values.

Published
2023

6. CONSUMO DE FRUTAS TROPICAIS NA AMAZÔNIA OCIDENTAL

Author

Lima, Marcus Vinicius Gonçalves, primary, Melo, Edmar Rober de, additional, Neto, Leila Santos, additional, Santi, Adalberto, additional, Martinez, Roberto Antonio Savelli, additional, Magalhães, Marcio Osvaldo Lima, additional, Lima, Mateus Bandeira, additional, and Castro, Pedro Ivo Prudêncio, additional

Published
2024
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9. Prime numbers and random walks in a square grid

Author

Fraile, Alberto, Kinouchi, Osame, Dwivedi, Prashant, Martínez, Roberto, Raptis, Theophanes E., and Fernández, Daniel

Subjects
Mathematics - Number Theory, Mathematics - History and Overview
Abstract

In recent years, computer simulations are playing a fundamental role in unveiling some of the most intriguing features of prime numbers. In this work, we define an algorithm for a deterministic walk through a two-dimensional grid that we refer to as Prime Walk. The walk is constructed from a sequence of steps dictated by and dependent on the sequence of last digits of the primes. Despite the apparent randomness of this generating sequence, the resulting structure -- both in 2d and 3d -- created by the algorithm presents remarkable properties and regularities in its pattern that we proceed to analyze in detail., Comment: 7 pages, 7 figures

Published
2021
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13. Recent Update on the Recovery of Various Metals from Wastewater

Author

Rubio-Franchini, Isidoro, Alvarado-Flores, Jesús, Martínez, Roberto Rico, G. Kostianoy, Andrey, Series Editor, Carpenter, Angela, Editorial Board Member, Younos, Tamim, Editorial Board Member, Scozzari, Andrea, Editorial Board Member, Vignudelli, Stefano, Editorial Board Member, Kouraev, Alexei, Editorial Board Member, Singh, Pardeep, editor, Verma, Pramit, editor, and Singh, Ravindra Pratap, editor

Published
2023
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14. Recovery of Nutrients from Wastewater

Author

Pérez-Legaspi, Ignacio Alejandro, Santos-Medrano, Gustavo Emilio, Rubio-Franchini, Isidoro, Martínez, Roberto Rico, G. Kostianoy, Andrey, Series Editor, Carpenter, Angela, Editorial Board Member, Younos, Tamim, Editorial Board Member, Scozzari, Andrea, Editorial Board Member, Vignudelli, Stefano, Editorial Board Member, Kouraev, Alexei, Editorial Board Member, Singh, Pardeep, editor, Verma, Pramit, editor, and Singh, Ravindra Pratap, editor

Published
2023
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15. Future Research on the Sustainable Utilization of Wastewater as Resources with Emphasis on Plastics

Author

Santos-Medrano, Gustavo Emilio, Robles-Vargas, Daniel, Pérez-Legaspi, Ignacio Alejandro, Rico-Martínez, Roberto, G. Kostianoy, Andrey, Series Editor, Carpenter, Angela, Editorial Board Member, Younos, Tamim, Editorial Board Member, Scozzari, Andrea, Editorial Board Member, Vignudelli, Stefano, Editorial Board Member, Kouraev, Alexei, Editorial Board Member, Singh, Pardeep, editor, Verma, Pramit, editor, and Singh, Ravindra Pratap, editor

Published
2023
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24. Introduction

Author

Garay-Martinez, Roberto, Garrido-Marijuan, Antonio, Garay-Martinez, Roberto, editor, and Garrido-Marijuan, Antonio, editor

Published
2022
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37. A data-driven model for the analysis of energy consumption in buildings

Author

Borgato Nicola, Prataviera Enrico, Bordignon Sara, Garay-Martinez Roberto, and Zarrella Angelo

Subjects
Environmental sciences, GE1-350
Abstract

Data-driven models are gaining traction in Building Energy Simulation, driven by the increasing role of smart metering and control in buildings. This paper aims to enhance the knowledge in this sector by introducing a practical method to analyse heating consumption. The methodology involves the analysis of hourly total heating demand and outdoor temperature measurements to create and calibrate Energy Signature Curves. Importantly, the building Energy Signature Curve is calibrated independently for each daily hour, resulting in a subset of 24 data-driven models. After calibration, a disaggregation algorithm is proposed to distinguish space heating from domestic hot water usage. The method also evaluates the building’s thermal inertia, examining the correlation between the hourly global energy consumption and the outdoor air temperature moving average. It also presents a methodology for improving the DHW heat consumption model. The methodology is applied to a case study of 51 buildings in Tartu, Estonia, with complete yearly demand measurements from the district heating operator. Thanks to the hourly calibration approach, R2 is 0.05 higher on average than the yearly Energy Signature Curve approach. The difference between estimated and measured annual energy consumption is 8% on average, demonstrating the practicality and effectiveness of the proposed method.

Published
2024
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39. Jacob's Ladder: Prime numbers in 2d

Author

Fraile, Alberto, Martinez, Roberto, and Fernandez, Daniel

Subjects
Mathematics - History and Overview
Abstract

Prime numbers are one of the most intriguing figures in mathematics. Despite centuries of research, many questions remain still unsolved. In recent years, computer simulations are playing a fundamental role in the study of an immense variety of problems. In this work, we present a simple representation of prime numbers in two dimensions that allows us to formulate a number of conjectures that may lead to important avenues in the field of research on prime numbers. In particular, although the zeroes in our representation grow in a somewhat erratic, hardly predictable way, the gaps between them present a remarkable and intriguing property: a clear exponential decay in the frequency of gaps vs gap size. The smaller the gaps, the more frequently they appear. Additionally, the sequence of zeroes, despite being non-consecutive numbers, contains a number of primes approximately equal to n/log(n) , being n the number of terms in the sequence., Comment: 17 pages, 12 figures. v2: Accuracy improved, new results included and references added. v3: Slight clarifications, matches version accepted by journal

Published
2017
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45. SM Higgs boson and $t\rightarrow cZ$ decays in the 2HDM type III with CP violation

Author

Gaitán, Ricardo, Martinez, Roberto, de Oca, Jose Halim Montes, and Garcés, Estela A.

Subjects
High Energy Physics - Phenomenology
Abstract

We compute the contributions to rare top decays $t\rightarrow cZ$ and $t\rightarrow ch_1$ from the scalar sector in the 2HDM type III with CP violation, where $h_1$ is the Standard Model Higgs boson. The branching ratio for $BR(t\rightarrow c Z)$ and $BR(t\rightarrow c h_1)$ are obtained as a function of the model parameters. In particular, the $BR(t\rightarrow c Z)$ can increase its value up to $10^{-3}$ for $\tan\beta= 1$ and masses for the additional Higgs bosons of $m_{h_2,h_3,H^\pm}\sim 0.5$ TeV. Meanwhile $BR(t\rightarrow c h_1)$ can reach values of the order of $\sim10^{-2}$. We constrain the model parameters (mixing angles of the neutral scalar fields in the CP violation context and $\tan\beta$) using the reported values of the signal strengths $R_{XX}$ and $b \rightarrow s \gamma$ process., Comment: 19 pages, 12 figures

Published
2017
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46. Contemporary Research and Debated Issues on John the Baptist.

Author

Martinez, Roberto

Subjects
*SCHOLARLY method, *ESCHATOLOGY, *PREACHING
Abstract

This article surveys recent studies about John the Baptist, focusing on disputed issues in contemporary research about this historical figure. After briefly reviewing the history of research as a framework for this survey, a presentation of the major contributions on John during the last decades follows. The article then reports on the status quaestionis of some still debated subjects related to the Baptist, such as the content of his message, portrayal as Elijah, relationship to Jesus, baptism, the account in Josephus, association with the Essenes/Qumran, and other minor matters. The work concludes by assessing what the author considers the most important research shifts and contributions of studies on John the Baptist in recent scholarship. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Acoustic response of structured and randomized porous blunt trailing edges subject to turbulent boundary layers.

Author

Arcondoulis, Elias J. G., Ragni, Daniele, Fiscaletti, Daniele, Merino-Martinez, Roberto, and Liu, Yu

Subjects
TURBULENT boundary layer, NOISE control, POROUS materials, ACOUSTIC radiators, FLOW velocity
Abstract

The attachment of porous media to a blunt trailing edge (TE) can significantly suppress vortex shedding processes and the related tonal noise, yet the near-wall and internal flow fields of porous media are difficult to analyze experimentally and rely on numerical simulations to elucidate the internal flow features. A structured porous trailing edge (SPTE) has been recently designed that follows a methodology of a structured porous coated cylinder. The SPTE acoustic response was compared against randomized porous media with 10 and 30 pores/in. in an anechoic wind tunnel over a range of flow velocities. Acoustic beamforming revealed that the dominant acoustic sources were at the end of the solid plate, even when a porous TE was attached. A region of integration was used to extract acoustic spectra without additional noise sources, revealing that the SPTE possesses superior noise reduction capability. Dipolar directivity patterns were observed at the vortex shedding frequency for each TE, and the coherence between microphones revealed the complex acoustic propagation of the high-frequency content. A wavelet analysis revealed how the SPTE breaks periodic vortex shedding cycles into smaller cycles over a wider frequency range, leading to an overall noise reduction relative to the other TEs. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Top and bottom tensor couplings from a color octet scalar

Author

Martinez, Roberto and Valencia, German

Subjects
High Energy Physics - Phenomenology
Abstract

We compute the one-loop contributions from a color octet scalar to the tensor anomalous couplings of top and bottom quarks to gluons, photons and W bosons. We use known constraints on the parameters of the model to compare the predicted size of these couplings with existing phenomenological constraints., Comment: References added, matches accepted version for publication

Published
2016
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