2024-03-29T09:46:23Z
https://revistas.javeriana.edu.co/index.php/iyu/oai
oai:ojs.revistas-javeriana.repositoriodigital.com:article/5368
2020-08-22T00:41:41Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/5368
2020-08-22T00:41:41Z
Pontificia Universidad Javeriana
Vol. 20 No. 1 (2016): January-June; 155-174
Trees in urban ecosystem: connection between new urbanism, society and rational risk management
Calaza-Martínez, Pedro; Universidad de Santiago de Compostela
2015-12-07
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/5368
green Infrastructure
urban forestry
society
hazard risk assessment
biomechanics
management
en_US
The relentless and massive population migration process to the cities is a phenomenon of great concern due to the large urban overcrowding and the consequent environmental, public health, and social problems involved, among others. In fact, in this century, Pickett already talks of “urban species,” where more than 50% of the world’s population already lives in cities. Within the different theories, approaches, and strategies to carry out a more rational territorial development that generates healthy cities, greening processes, and green infrastructure, the need to try to mitigate these terrible consequences is highlighted. This strategy, recently endorsed by the EU, has numerous benefits and components such as green roofs, vertical gardening, greenways, etc., although perhaps one of the most important is the urban forest. Its governance is extremely important and should include, aside from the plans which maximize the benefits, those that minimize problems, and above everything the most important: its inherent potential danger. Sometimes trees have collapsed causing serious consequences, but often they are identifiable and preventable i.e. external biomechanics symptoms are indicators of internal problems. Therefore the incorporation of scientific and technical approaches (including specific tools such as tomograph, Static Load Test, etc.) about risk assessment should be an integral component of the management of green infrastructure.
oai:ojs.revistas-javeriana.repositoriodigital.com:article/12223
2020-08-21T20:06:06Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/12223
2020-08-21T20:06:06Z
Pontificia Universidad Javeriana
Vol. 20 No. 1 (2016): January-June; 175-198
Self-supply as an alternative approach to water access in rural scattered regions: evidence from a rural microcatchment in Colombia
Dominguez-Rivera, Isabel; Universidad Industrial de Santander
Torres-López, Wilmar; Universidad del Valle
Restrepo-Tarquino, Inés; Universidad del Valle
Patterson, Charlotte; Newcastle University
Gowing, John; Newcastle University
2015-12-07
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/12223
Self-supply
water quality
Thermotolerant coliforms
rural areas
Colombia
en_US
Globally, access to improved water sources is lower in rural areas compared to urban areas. Furthermore, in rural areas many people use water from individual systems they have developed with their investments, often without external support. This phenomenon has been called Self-supply. Self-supply ranges from simple to complex systems and different water sources. Water quality varies, from achieving World Health Organization (WHO) standards (0 CFU/100 ml) to systems that provide water posing high risks to human health. While most studies in Self-supply have been developed in Africa, little is known in Latin America and the Caribbean (LAC). This research explores Self-supply in a rural microcatchment in Colombia (LAC). Data was collected through household and drinking water surveys and analysed. Results showed that 40% of households used Self-supply systems taking water from springs and brooks. Thermotolerant Coliforms were below 50 CFU/100 ml, both in dry and rainy season, and between 5 to 7% of samples achieved the WHO standard. These results suggest that Self-supply has potential to offer safe drinking water, provided improvements on source protection and institutional support. Therefore, Self-supply could contribute to address “unfinished business”, including ensuring access for the hardest-to-reach people, as stated in the post-2015 development agenda.
oai:ojs.revistas-javeriana.repositoriodigital.com:article/12769
2020-08-21T18:17:00Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/12769
2020-08-21T18:17:00Z
Pontificia Universidad Javeriana
Vol. 20 No. 2 (2016): July-December; 373-390
Adaptation of the L-moments method for the regionalization for maximum annual temperatures in Colombia
Núñez-Galeano, Lisandro; Pontificia Universidad Javeriana
Giraldo-Osorio, Juan Diego; Pontificia Universidad Javeriana
2016-06-20
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/12769
Regionalization
L-moments methodology
regional frequency analysis
annual maximum temperature
en_US
The present study has developed a regional frequency analysis for Annual Maximum Temperature (AMT) in the hydrographic basins of Colombia. The L-moments methodology was applied for the regionalization. Five stages were considered to apply the methodology: data analysis; the L-Moments estimation; identification of homogeneous regions; fit of probability density functions (pdf) to observed data and estimation of quantile values; and finally, the developing and drawing of regionalized maps. Overall, fifteen homogeneous regions were identified and selected for the regionalization of AMT, which meet specific criteria of homogeneity and discordance. Several pdf for regional frequency analysis were tested in order to select the best probability function. Finally, regionalized temperature maps were generated for several return periods. Using the L-Moments methodology, the regionalization procedure was done using the average of AMT as the key scale parameter. The regionalization procedure ensures, as far as possible, a coherent-basin approach: the boundaries between homogeneous regions were drawn, complying with the catchment borders.
oai:ojs.revistas-javeriana.repositoriodigital.com:article/18971
2020-09-16T20:09:37Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/18971
2020-09-16T20:09:37Z
Pontificia Universidad Javeriana
Vol. 22 No. 2 (2018): July - December
Effect of different geographic altitudes on the performance of a conventional solar still with arsenic and boron removal efficiency in an arid zone
Chavez-Yavara, Wladimir Antonio; Universidad Arturo Prat
Torres-Paiva, Betzabé Andrea; Universidad Arturo Prat
Zambra-Sazo, Carlos Enrique; Universidad de Talca
2018-08-09
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/18971
Conventional solar still
Arsenic removal
Boron removal
en_US
Objectives: Report the exploratory study results of the performance of a conventional solar still prototype using seawater and brackish water (river and well) at three locations in northern Chile at different geographical heights. Materials and methods: A solar still with an effective distillation area of 0.54 m2 was used. Three tests were performed with seawater, 1 with river water and 1 with well water. The temperatures and environmental parameters were measured every 10 minutes for 36 continuous hours. The efficiency was evaluated in terms of seawater and the capacity to remove natural contaminants from brackish water. Results and discussion: The productivity in the three selected areas was 3 and 4 L/m2 for seawater and brackish water, respectively. The removal of boron and arsenic complies with the regulations of the country. Conclusion: The results obtained are of exploratory character for the zones, where the geographic height and the total dissolved solids are factors that determine the performance of a passive solar still, which is higher when water is used with low concentrations of solids.
oai:ojs.revistas-javeriana.repositoriodigital.com:article/20173
2020-08-06T22:07:13Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/20173
2020-08-06T22:07:13Z
Pontificia Universidad Javeriana
Vol. 23 No. 2 (2019): July-December
Model for the prediction of noise generated by fixed sources
Echeverri-Londoño, Carlos; Universidad de Medellín
Ortiz-Pabón, Jairo; Universidad de Medellín
2019-12-06
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/20173
Noise
ISO 9613 Part 2
Noise propagation
en_US
Objective: This article proposes a prediction model applicable to the propagation of noise generated by fixed sources as the result of the analysis of the phenomena related to the generation and propagation of sound levels and the subsequent correlation between the estimated levels and the data recorded in the field. Materials and methods: An experimental program was designed that included the measurement of sound pressure levels with a sound level meter in free field conditions for different weather conditions and distances from the noise emission source for comparison with the levels estimated by ISO 9613 Part 2. A statistical analysis of the data recorded in the field was performed to observe their dependence on the meteorological variables recorded during the measurements. Results and discussion: The standard error for the proposed prediction method is 11.4 dB(A), and the absolute average error is 9.1 dB(A). The correlation coefficient of the proposed model is 0.87. A statistically significant relationship exists between the variables at the 95 % confidence level. Conclusion: A propagation model that presented a better fit than the method of ISO 9613 Part 2 and a higher correlation coefficient was obtained.
oai:ojs.revistas-javeriana.repositoriodigital.com:article/23392
2020-08-07T00:43:04Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/23392
2020-08-07T00:43:04Z
Pontificia Universidad Javeriana
Vol. 23 No. 2 (2019): July-December
An approach for the identification of particulate matter in the clouds of Bogotá using satellite imagery analysis
Aragón-Moreno, Juan Antonio; Universidad Libre
Espinosa-Martínez, Laura Isabel; Universidad Libre
Castañeda-Garzón, Paula Andrea; Universidad Libre
2019-12-06
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/23392
Air quality
satellite images
Landsat 8
ArcGis
particulate material
clouds
meteorological variables
atmospheric reflectance an spectral bands
en_US
Objective: An analysis of the air quality of Bogotá by identifying clouds during the period from 2013-2017 and verifying patterns of behavior between cloud formation and the concentration of particulate matter is presented. Materials and methods: The study sample includes data provided by the Bogotá Air Quality Monitoring Network (RMCAB), taking into account the concentration of particulate matter, temperature, precipitation, wind direction and wind speed. The data are compared with Landsat 8 satellite images and different combinations of spectral bands through the use of the Geographic Information System (GIS) ArcGis. Results and discussion: A high model correlation is reflected in a percentage greater than 90%, presenting a greater coincidence with a periodicity of two years during the dry period; it is possible to observe that the concentration of pollutants follows the trend of the wind vector lines, and the concentration has a direct correlation with cloud formation, which is influenced by temperature, wind speed and wind direction. Conclusions: This paper provides an alternative for the measurement of particulate matter and contributes to the collection of information on this research topic.
oai:ojs.revistas-javeriana.repositoriodigital.com:article/24161
2021-10-22T01:51:14Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/24161
2021-10-22T01:51:14Z
Pontificia Universidad Javeriana
Vol. 24 (2020): Continuous Publication
Geothermal Energy in Colombia as of 2018
Moreno-Rendón, David Alejandro; Universidad de Medellín
López-Sánchez, Jacqueline; Universidad de Medellín
Blessent, Daniela; Universidad de Medellín
2020-02-24
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/24161
geothermal resources
Colombia
renewable energies
en_US
Colombia is a country with great potential for the exploitation of geothermal energy due to its high volcanic activity caused by the subduction between the Nazca and South American tectonic plates. However, this energy is yet to be exploited. This article seeks to describe, by means of a literature review and information processing, the current status of geothermal energy in Colombia, including the current regulations, the limitations, the recommendations to develop the geothermal energy, and some of the most important projects, studies, and research papers that have been emerged on the discovery, exploration, and exploitation of geothermal energy within the country, emphasizing the areas where exploration projects have been initiated, such as the Nevado del Ruiz volcano, the Tufiño–Chiles–Cerro Negro volcanic system, the Azufral volcano geothermal area, and the Paipa geothermal area. Over the years, energy vulnerability in Colombia and a government policy of fostering sustainable development in different territories have generated favorable conditions for the exploitation of geothermal resources. Nevertheless, there are several technical, infrastructural, legal, and institutional barriers that slow the proper development of these projects.
oai:ojs.revistas-javeriana.repositoriodigital.com:article/25489
2022-08-09T03:27:16Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/25489
2022-08-09T03:27:16Z
Pontificia Universidad Javeriana
Vol. 25 (2021): Continuous Publication
Support Vector Machines Used for the Prediction of the Structural Conditions of Pipes in Bogota’s Sewer System
Hernández, Nathalie; Pontificia Universidad Javeriana
Caradot, Nicolas; Kompetenzzentrum Wasser Berlin
Sonnenberg, Hauke; Kompetenzzentrum Wasser Berlin
Rouault, Pascale; Kompetenzzentrum Wasser Berlin
Torres, Andrés; Pontificia Universidad Javeriana
2021-06-17
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/25489
Sewer asset management
structural condition
classification and regression models
support vector machines (SVM)
en_US
Objective: this paper focused on: (i) developing a deterioration model based on support vector machines (SVM) from its regression approach to separate the prediction of the structural condition of sewer pipes from a classification by grades and predict the scores obtained by failures found in CCTV inspections; and (ii) comparing the prediction results of the proposed model with the ones obtained by a deterioration model based on SVM classification tasks to explore the advantages and disadvantages of their predictions from different perspectives. Materials and methods: The sewer network of Bogota was the case study for this work in which a dataset consisting of the characteristics of 5031 pipes inspected by CCTV (obtained by GIS) was considered, as well as information on external variables (e.g., age, sewerage, and road type). Probability density functions (PDF) were used to convert the scores given by failures found in CCTV into structural grades. In addition, three techniques were used to evaluate the predictions from different perspectives: positive likelihood rate (PLR), performance curve and deviation analysis. Results: it was found that: (i) SVM-based deterioration model used from its regression approach is suitable to predict critical structural conditions of uninspected sewer pipes because this model showed a PLR value around 6.8 (the highest value among the predictions of all structural conditions for both models) and 74 % of successful predictions for the first 100 pipes with the highest probability of being in critical conditions; and (ii) SVM-based deterioration model used from its classification approach is suitable to predict other structural conditions because this model showed homogeneous PLR values for the prediction of all structural conditions (PLR values between 1.67 and 3.88) and deviation analysis results for all structural conditions are lower than the ones for the SVM-based model from its regression approach.
oai:ojs.revistas-javeriana.repositoriodigital.com:article/28937
2022-08-09T19:38:35Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/28937
2022-08-09T19:38:35Z
Pontificia Universidad Javeriana
Vol. 26 (2022): Continuous Publication
Technologies in Wastewater Treatment Plants for the Removal of Antibiotics, Resistant Bacteria and Antibiotic Resistance Genes: a Review of the Current Literature
Zapata Zúñiga, Maria Camila; Universidad Santo Tomás
Parra-Pérez, Miguel Angel ; Universidad Santo Tomás
Álvarez-Berrio, Johan Alexander; Universidad Santo Tomás
Molina-Gómez, Nidia Isabel ; Universidad Santo Tomás
2021-11-02
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/28937
Antibiotics
sewage treatment
antibiotic resistance bacteria
antibiotic resistance genes
en_US
This study aimed to evaluate the efficiency of technologies for removing antibiotics, antibiotic-resistant bacteria and their antibiotic resistance genes, and the countries where they have been developed. For this purpose, was conducted a systematic review to identify the tertiary treatments to remove the above-mentioned pollutants. The ScienceDirect and Scopus databases were used as sources of information, taking into account only experimental research from 2006 to 2019 and technologies with removal rates higher than 70% to the information analyses. From the analysis of 9 technologies evaluated, in a set of 47 investigations, photo-Fenton, and electrochemical treatments were found to be the most efficient in the removal of antibiotics; gamma radiation and photocatalysis with TiO2 and UV revealed better results in the removal of resistant microbial agents and their resistance genes, with efficiencies of 99.9%. As one of the largest producers and consumers of antibiotics, China appears to be the country with the most scientific research on the area. The importance of innovation in wastewater treatment processes to achieve better results in the remotion of antibiotics, antibiotic-resistant bacteria, and their resistance genes is highlighted, given the effects on the aquatic ecosystems and public health.
oai:ojs.revistas-javeriana.repositoriodigital.com:article/29300
2022-08-09T19:47:12Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/29300
2022-08-09T19:47:12Z
Pontificia Universidad Javeriana
Vol. 26 (2022): Continuous Publication
Improvement of Biowaste Composting by Addition of Sugarcane Filter Cake as an Amendment Material
Moreno-Escandón, Laura; Universidad del Valle
Perea-Soto, Daniela; Universidad del Valle
Soto-Paz, Jonathan; Universidad del Valle
Torres-Lozada, Patricia; Universidad del Valle
Marmolejo-Rebellón, Luis Fernando; Universidad del Valle
2021-11-02
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/29300
Agricultural value
Amendment material
Biowaste
Co-composting
Filter cake
es_ES
Objective: The goal of this research was to evaluate the influence of the incorporation of Sugarcane Filter Cake (SFC) as an amendment material (AM) on the process of biowaste (BW) composting and the quality of the final product. Methods: In this study the effect (in terms of stability, maturity and agricultural value) of SFC incorporation on four mixture proportions BW: SFC (100:00–control; 90:10; 80:20 and 70:30) was evaluated on a pilot scale. Results: The results show that overall, the incorporation of SFC enabled thermophilic temperatures to be achieved in a shorter time than the control treatment and improved the stability conditions (oxygen consumption <1.0 mgO2/gVSh), germination index (GI >80%: mature product) and quality product index (FI >3.5: high soil fertilization potential). The mixing ratio 80:20, showed the best product quality (highest total N content: 2.32%, TP: 1.42%, CEC: 65.5 meq/100 g), lower electrical conductivity (EC) value (0.38 dS/m) and total and fecal coliforms (15.3 and 4.0 NMP/g respectively), complying with technical standards (Colombian and Chilean) for organic products used as fertilizers and amendments or soil conditioners. In addition to demonstrating the best results of GI and FI (123.40% and 4.67 respectively).
oai:ojs.revistas-javeriana.repositoriodigital.com:article/29301
2022-08-09T04:47:44Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/29301
2022-08-09T04:47:44Z
Pontificia Universidad Javeriana
Vol. 25 (2021): Continuous Publication
Biofilms Production from Avocado Waste
Sánchez, Horacio; Universidad Técnica de Manabí
Ponce, Wilmer; Instituto Nacional de Investigaciones Agropecuarias
Brito, Beatriz; Instituto Nacional de Investigaciones Agropecuarias
Viera, William; Instituto Nacional de Investigaciones Agropecuarias
Baquerizo, Ricardo; Universidad Técnica de Manabí
Riera, Maria Antonieta; Universidad Técnica de Manabí
2021-10-12
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/29301
Bioplastic
biodegradable
biopolymers
food waste
en_US
Objective: To obtain biofilms from starch and cellulose present in the avocado (Persea americana) peel and seed. Materials and methods: The starch characterization included humidity, gelatinization temperature, paste clarity, absorption index, solubility index, swelling power, amylose, amylopectin, amount, and starch yield. Five mixtures were made with 3 g of starch, 5 mL of 30 % NaOH (w/v), 3 g of cellulose, and different proportions for glycerin: 2 g; 2.5 g; 3 g; 3.5 g; 4 g, and PVA: 2 g, 3 g, 4 g, 5 g, and 6 g. Films were formed on acrylic plates, using the casting method. The bioplastic was characterized in terms of moisture, solubility in water, density, thickness, biodegradability, stress, deformation, and modulus of elasticity. Results and discusión: The addition of cellulose to the mixture does not contribute to film formation, unlike PVA which did. The film had the best physical appearance with a mixture of 2 g of glycerin and 6 g of PVA. The bioplastic characterization was 23.43 % humidity, 39.39 % for water solubility, 1.52 g/cm3 density, 0.58 mm thickness, 21.03 % weight loss for the biodegradability test, 1.53 MPa for tension, 21.25 % deformation, and 10,04 MPa for the modulus of elasticity. Conclusions: The bioplastic obtained did not show the resistance of traditional plastic. However, the results obtained serve as a starting point for the realization of other formulations, aimed at producing a bioplastic capable of competing with its synthetic relatives.
oai:ojs.revistas-javeriana.repositoriodigital.com:article/30974
2022-09-07T19:26:07Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/30974
2022-09-07T19:26:07Z
Pontificia Universidad Javeriana
Vol. 26 (2022): Continuous Publication
Performance of Nozzle Steels in Biofuel
Blanco-Estupiñan, David Leonardo; Escuela Colombiana de Ingeniería Julio Garavito
Bermudez-Castañeda, Angela; Escuela Colombiana de Ingeniería Julio Garavito
Marquez, Sebastián; Escuela Colombiana de Ingeniería Julio Garavito
2022-07-27
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/30974
biofuel
nozzle
stainless steel
es_ES
Objective: To evaluate the corrosion resistance of stainless-steel injection nozzles under immersion test in biodiesel and perform electrochemical characterization under HNO3 solutions. Methods and materials: Chemical characterization of biofuel was performed to analyze its stability. Immersion tests were carried out for 4 months, evaluating 304 stainless steel under 3 different diesel/biofuel mixtures concentrations. Additionally, polarization tests were done using NOx concentrations above the levels measured from engine emissions. Results and discussion: The use of biofuels in Colombia has been largely driven by ethanol production from vegetable sources. Their use brings some advantages related to reducing emissions of particles and toxic gases (mainly aromatic groups, NOx, and CO2). However, degradation of materials can occur when they are in direct contact with biodiesel. Furthermore, solidification into waxes, which leads to plugging of nozzles, has been reported. However, it is unknown whether this influences oxygen diffusion in the solution and, in turn, affects the corrosion resistance of stainless steel. Conclusions: The corrosion resistance of the 304 stainless steel changed under immersion conditions, even though its protective layer was not affected by the NOx concentrations registered in the biofuel mixtures.
oai:ojs.revistas-javeriana.repositoriodigital.com:article/31540
2022-09-07T19:34:11Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/31540
2022-09-07T19:34:11Z
Pontificia Universidad Javeriana
Vol. 26 (2022): Continuous Publication
Treatment of Acid Drainage from Coal Mines Produced in the Boyacá Region, Colombia, using an Anaerobic Wetland with an Upward Flow
Blanco-Zuñiga, Cesar René; Universidad Pedagógica y Tecnológica de Colombia
Chacón-Rojas, Zully Ximena; Universidad Pedagógica y Tecnológica de Colombia
Villarraga-Castillo, Juan Sebastian; Universidad Pedagógica y Tecnológica de Colombia
Guevara-Suarez, Heidy Elizabeth; Universidad Pedagógica y Tecnológica de Colombia
Casteblanco-Castro, Yesica Nataly; Universidad Pedagógica y Tecnológica de Colombia
Rojas-Arias, Nicolás; Universidad Pedagógica y Tecnológica de Colombia; Federal University of São Carlos
2022-07-12
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/31540
Acid Mine Drainage (AMD)
Hydraulic Retention Time
Organic Substrate
Anaerobic Wetland
Sulfate-reducing bacteria (SRB)
en_US
Coal mining represents one of the primary economic incomes in the department of Boyacá, Colombia. However, the acid mine drainage (AMD) generated has a tremendous environmental impact in the area due to the presence of sulfate ions (SO4-2), heavy metals, and low pH This article studies the behavior in the content of Fe and sulfates in AMD samples when treated within an artificial anaerobic vertical flow wetland, analyzing the concentration of these elementsand the content of dissolved oxygen (DO) and pH at different time intervals. The treatment of a MAD from the department of Boyacá was carried out using a bioreactor prototype with an organic substrate to provide the necessary conditions for the development of sulfate-reducing bacteria. Measurements were made with hydraulic retention times between 24 to 120 hours, monitoring the changes in the content of total Fe, SO4-2, pH, and DO. The data obtained show a reduction for total Fe of 88.3%, established at 5.61g∙m-2∙day-1, and for SO4-2 of 34.3% with 9.35g∙m-2∙day-1; reaching a maximum removal degree of 52.32% at 120h for sulfates and 92% for Fe, where the maximum removal peak is achieved, reducing the Fe removal rate for longer times. The reduction in the concentration of Fe is related to the reduction of DO and regulation of the pH, in addition to favoring the reduction of sulfate ions through the formation of the mineralogical phases pyrite and siderite. These data show that the anoxic conditions of the organic environment are maintained, for which a subsequent aeration stage is suggested.
oai:ojs.revistas-javeriana.repositoriodigital.com:article/32585
2023-11-30T02:38:11Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/32585
2023-11-30T02:38:11Z
Pontificia Universidad Javeriana
Vol. 27 (2023): Continuous Publication
Assessment of a Hot-Mix Asphalt Using Recycled Concrete Aggregate. Case of Study: High Temperature Climate
Vacca-Gamez, Hermes Ariel; Pontificia Universidad Javeriana
Rubio-Tafur, José Elvert; Universidad La Gran Colombia
Moreno-Chaparro, Hernán Camilo; Universidad La Gran Colombia
Rondon-Quintana, Hugo Alexander; Universidad Distrital Francisco José de Caldas
2023-11-29
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/32585
Hot-mix asphalt
HMA
recycled concrete aggregate
RCA
resilient modulus
rutting
es_ES
In road infrastructure projects large quantities of naturally occurring aggregates (NA) are exploited and used to form asphalt layers in pavement structures. To reduce the negative environmental impact generated by this practice, these materials could be replaced by recycled concrete aggregates (RCA). In the present research, the change in stiffness under cyclic loading (resilient modulus – RM) and resistance to permanent deformation of an asphalt concrete mixture (HMA) was measured and evaluated when the coarse fraction (gravel and sand) of an NA is replaced by RCA in proportions of 20%, 40% and 80% concerning mass. The RM and permanent deformation were measured because Colombia is a country where high-temperature climate predominates, in one of the main damage mechanisms of HMAs is rutting. The results indicated an increase in the RM and the resistance to rutting of the HMA analyzed for any percentage of substitution. That is, the use of RCA as a substitute for NA could be a sustainable alternative, while at the same time, it could help increase the rutting resistance of HMA.
oai:ojs.revistas-javeriana.repositoriodigital.com:article/32759
2023-02-08T13:24:26Z
iyu:C%26EE
driver
v2
https://revistas.javeriana.edu.co/index.php/iyu/article/view/32759
2023-02-08T13:24:26Z
Pontificia Universidad Javeriana
Vol. 26 (2022): Continuous Publication
Fatigue Behavior of Ultrahigh-Performance Fiber-reinforced Concrete as an Alternative for Flexible Pavement Rehabilitation
Torres, Giovanni; Pontificia Universidad Javeriana
Romano, Juan; Pontificia Universidad Javeriana
Vacca, Hermes; Pontificia Universidad Javeriana
Alvarado, Yezid; Pontificia Universidad Javeriana
Reyes, Fredy; Pontificia Universidad Javeriana
2022-12-16
This journal is registered under a Creative Commons Attribution 4.0 International Public License. Thus, this work may be reproduced, distributed, and publicly shared in digital format, as long as the names of the authors and Pontificia Universidad Javeriana are acknowledged. Others are allowed to quote, adapt, transform, auto-archive, republish, and create based on this material, for any purpose (even commercial ones), provided the authorship is duly acknowledged, a link to the original work is provided, and it is specified if changes have been made. Pontificia Universidad Javeriana does not hold the rights of published works and the authors are solely responsible for the contents of their works; they keep the moral, intellectual, privacy, and publicity rights.Approving the intervention of the work (review, copy-editing, translation, layout) and the following outreach, are granted through an use license and not through an assignment of rights. This means the journal and Pontificia Universidad Javeriana cannot be held responsible for any ethical malpractice by the authors. As a consequence of the protection granted by the use license, the journal is not required to publish recantations or modify information already published, unless the errata stems from the editorial management process. Publishing contents in this journal does not generate royalties for contributors.
url:https://revistas.javeriana.edu.co/index.php/iyu/article/view/32759
UHPC
UHPFRC
fatigue
flexural
concrete
strain
stress
fiber
precracking
en_US
The fatigue behavior of ultrahigh-performance fiber-reinforced concrete for use as an overlay in the typical rehabilitation of a flexible pavement structure was analyzed in this study. Compression and four-point bending tests were carried out to characterize the concrete mechanical properties. Fatigue tests were performed using the four-point method, and test beams were evaluated without precracking. The specimens were subjected to constant-amplitude sinusoidal loading with a loading frequency of 10 Hz. The magnitude of each stress level was calculated as a percentage of the initial crack stress. The following results were obtained for the concrete: a compressive strength of 127.1 MPa, bending yield strength of 6.23 MPa, maximum bending stress of 9.89 MPa, Young's modulus of 38.1 GPa, and dynamic modulus of 28.6 GPa. The stress and strain at one million cycles were 6.0 MPa and 166 μm/m, respectively. The fatigue test results indicated superior properties of the ultrahigh-performance concrete to those of similar materials.