• Automated System for Improving Audit Data Processing Through DAMA-DMBOK Best Practices and Low-Code

  Yen, Armando Ruiz; Kapustin, Celso Valdes; Burga-Durango, Daniel; Tello-Saenz, Carlos Alberto (Springer Science and Business Media Deutschland GmbH, 2025-01-01)

  In the context of financial auditing, the efficient retrieval of accurate data, minimization of reprocessing efforts, mitigation of inherent risks in data processing, and improvement of information quality represent crucial objectives. In this regard, we present an automated system designed to optimize data processing in auditing. This system provides an automated assessment of the six data quality dimensions according to the DAMA model: completeness, reasonability, accuracy, uniqueness, validity, and consistency. This process is essential to determine whether data sources meet the necessary standards for use in various analytical processes. The tool was validated in the Wholesale Banking Management of Banco de Crédito del Perú, where it successfully analyzed 100% of data sources in the commercial credit audit, reducing the processing time of each source by 10 times. These results confirm that our software significantly contributes to improving data processing in the field of financial auditing. This system has proven to be effective and reliable in enhancing the overall efficiency and accuracy of financial audits.
• Designing a sustainable performance measurement system for an agri-food supply chain through supply chain agility based on digital technologies

  Ramos, Edgar; Chavez Grados, Melissa Andrea; Govindan, Kannan; Gamarra Gomez, Kiara Elizabeth; Gavirneni, Nagesh (Emerald Publishing, 2025-01-01)

  Purpose: This research aims to identify and model metrics and sub-metrics that enhance sustainable performance measurement in agri-food supply chains. Design/methodology/approach: The study evaluates five key metrics and 18 sub-metrics critical to this industry, establishing interrelationships among them to ensure a successful sustainable performance measurement system. The decision-making trial and evaluation laboratory technique was employed, integrated with fuzzy theory and expert opinions. Findings: The findings suggest that metrics like information technology and organizational productivity, alongside the sub-metric of information integration, significantly contribute to sustainable supply chain performance. Originality/value: This study proposes a performance measurement system that enables organizations to achieve optimal performance levels through a sustainable supply chain (SCC) and supply chain agility (SCA) framework, supported by digital technologies.
• BLOCKSAGE: Blockchain-Based Cloud Architecture for Sensitive Data Management in SMEs

  Ascue, Olga; Valle, Omar; Santisteban, José (Multidisciplinary Digital Publishing Institute (MDPI), 2025-02-01)

  Small and medium-sized enterprises (SMEs) face significant challenges from security breaches, which can jeopardize their operational sustainability. This study presents the BLOCKSAGE SME system, a model designed to enhance the security of sensitive data storage and transfer. The system integrates customizable cloud infrastructure, private blockchain networks, Zero Trust architecture, a scalable API, and IPFS encryption, ensuring data privacy and business continuity. Based on a comprehensive literature review of blockchain-based solutions for SMEs, a web-based file-sharing prototype was developed and tested to validate the framework. The system was then evaluated through expert judgment and feedback from SME leaders. The results showed a satisfaction score of 4.06 from cybersecurity and blockchain specialists and 4.2 from the target SME audience on a Likert scale, indicating the system’s feasibility and effectiveness. While the system provides robust security measures, adoption challenges were identified, including the early-stage maturity of blockchain technology and cultural and workforce-related barriers within the Peruvian SME ecosystem. In conclusion, the findings suggest that blockchain-based architectures hold strong potential for addressing security gaps in SMEs, but implementation faces current limitations in resources and knowledge. Future research should explore adapting the system as a Software-as-a-Service (SaaS) solution to improve scalability and accessibility, further supporting the sustainability of SMEs.

  Acceso abierto
• An IoT Monitoring System Based on Artificial Intelligence Image Recognition and EMG Signal Processing for Abdominal Exercise Performance

  Jurado, Marco; Palma, Branco; Figueroa, Andres; Kemper, Guillermo (International Federation of Engineering Education Societies (IFEES), 2025-03-10)

  Correctly executing exercises during training is of vital importance to ensure adequate athletic performance. Sit-ups are among the most frequently performed exercises requiring proper evaluation. This exercise contributes to increasing abdomen strength, having better posture to reduce back problems, and improving overall physical condition and appearance, among other benefits. Existing methods for evaluating the correct execution of sit-ups are manual, subjective, and inefficient in terms of time, cost, and precision. Therefore, there is a need to have technological tools that measure and monitor core abdominal strength while simultaneously verifying, through image processing, the correct execution of the exercise. Since no solutions with these capabilities have been found in the literature, this work proposes a system that performs these functions using electromyographic (EMG) sensors, force signal processing, and biomechanical monitoring based on image processing and the BlazePose algorithm. The results obtained show a very satisfactory performance of the biomechanical monitoring method, where an accuracy of over 95% is obtained in the identification of the correct body posture, while for the estimation of abdominal strength, a sensitivity of over 90% is achieved during the execution of sit-ups.

  Acceso abierto
• Implementation of a Low-Cost Structural Health Monitoring System for Bridges in Peru

  Ita, Rocio I.; Casas, Joan R.; Delgadillo, Rick M. (Springer Science and Business Media Deutschland GmbH, 2025-01-01)

  Structural health is important especially in older bridges that were designed without earthquake resistant design. Therefore, it is proposed to use wireless accelerometers with environmental temperature and humidity sensors, using a total of 6 Arduino Due sensors distributed along the bridge segments. In addition, Raspberry Pi boards linked to a laptop are implemented to facilitate monitoring of the structure. Also, a modal analysis was carried out to obtain the frequencies, the first and second modes of vibrating correspond to frequencies of f_1 = 1.15 Hertz and f_2 = 1.55 Hertz, and with a damping of 5% that helps to choose the location of the sensors. This approach provides valuable information about the health of the bridge, allowing early detection of potential problems or anomalies. On the other hand, the prices of a used sensor are compared with a commercial sensor. It is shown that choosing low-cost accelerometers instead of commercial sensors can significantly reduce costs, saving between 59 and 83%. This optimization not only seeks efficiency in structural monitoring, but also more economical and effective management of bridge infrastructure. The research comprehensively addresses the implementation of a structural monitoring system, from the selection of sensors to the strategic location on the bridge, underscoring the importance of economic efficiency in the management of the structural health of bridges in Peru.
• Structural Damage Detection Using an Unmanned Aerial Vehicle-Based 3D Model and Deep Learning on a Reinforced Concrete Arch Bridge

  Alfaro, Mary C.; Vidal, Rodrigo S.; Delgadillo, Rick M.; Moya, Luis; Casas, Joan R. (Multidisciplinary Digital Publishing Institute (MDPI), 2025-02-01)

  Visual inspection is a common method for detecting structural damage, but has limitations in terms of subjectivity, time, and access. This research proposes an innovative approach to identify cracks using a 3D model generated from photographs of an unmanned aerial vehicle (UAV) and the use of a convolutional neural network (CNN). These networks are effective in detecting complex patterns, improving the accuracy and efficiency of damage identification based on simple visual inspection. The case study is the old Villena Rey bridge in Lima, Peru. The methodology covers (i) the development of a 3D model of the bridge structure, (ii) the extraction of photographs of the model and its binary segmentation, (iii) the application of deep learning through the training and testing phase of a CNN to achieve crack detection in photographs, and (iv) damage location within the 3D model. An 88.4% accuracy was achieved in crack detection, identifying 18 damage points, of which 3 turned out to be false positives. Additionally, it was determined that the left pillar in the southern area of the bridge presented the highest concentration of damage, which underlines the effectiveness of the method used.

  Acceso abierto
• Study of Internal Flow with Deceleration in a Cryogenic Chamber Composed of Jet-Type Atomizers

  Arriaga, Ian; Sayán, Jasuo; Ronceros, Julio; Klusmann, Mirko; Raymundo, Carlos; Namay, Wilder; Ronceros, Gustavo (Semarak Ilmu Publishing, 2025-06-01)

  The present article delves into the comprehensive study of internal flow dynamics within a cryogenic chamber used for freezing food with high water percent. For cryogenic freezing is necessary to reduce temperature extremely and maintain a uniform distribution, different behaviours may cause structural damages on food. This is because the chamber comprises a circular-sectioned tunnel or chamber coupled with a set of Jet-type atomizers for the injection of liquid nitrogen. The internal flow, predominantly consisting of liquid nitrogen, necessitates prolonged residency within the chamber to uniformly and effectively cool or freeze food traversing its interior. Consequently, the primary aim is to extend the cryogenic fluid's residence time, achieved by strategically decelerating the flow. This deceleration is orchestrated through the strategic injection of the fluid to induce a swirling or vortex effect. The formation of this effect is meticulously executed by positioning the atomizers at periodic intervals around the internal walls of the cylindrical chamber, ensuring a prolonged recirculation of the internal flow. This research endeavour is further augmented by a comprehensive numerical analysis of swirling flow dynamics and associated parameters such as temperature, velocity, pressure and nitrogen-liquid interface. Leveraging the robust capabilities of CFD ANSYS software (Computational Fluid Dynamics), this analysis incorporates sophisticated models including the Volume of Fluid (VOF) model and the k-epsilon turbulence model. Additionally, the construction of a three-dimensional hexahedral mesh, facilitated by ICEM CFD software, adds depth and precision to the numerical simulations. The culmination of this study lies in the profound comprehension of internal flow behaviour and its intrinsic correlation with the design intricacies of the cryogenic system. Variations in nitrogen injection pressures and the strategic deployment of atomizers around the chamber serve as pivotal parameters for elucidating the system's optimal design.

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  Spatiotemporal analysis of glacial retreat at the Coropuna and Solimana volcanoes in Peru, using NDWI calculation between 1986 - 2022

  Viera Castañeda, Fabrizio Alexander; Villena Cortegana, Maria Fernanda; Liendo Perea, Antonio Joaquín; Bolívar Fernández, Daniela Kristel; Rodríguez Paredes, Andrea Jazlynn; Giraldo Malca, Ulises Francisco (Latin American and Caribbean Consortium of Engineering Institutions, 2023)

  En las últimas décadas la deglaciación de los nevados tropicales representa una reducción del almacenamiento hídrico para poblaciones, actividades económicas y ecosistemas que dependen de sus aguas, especialmente en zonas áridas como las vertientes de la cordillera del Ampato en el departamento de Arequipa, en los Andes del sur de Perú, siendo necesario determinar los factores que lo impulsan, como su relación con el calentamiento global y otros eventos climatológicos relevantes. En ese sentido el objetivo de la investigación fue determinar la relación entre la pérdida de área glaciar en los estratovolcanes Coropuna y Solimana con la variación de temperaturas y precipitaciones registradas en las estaciones meteorológicas más próximas durante el periodo 1986 a 2022. Para ello, se determinó la superficie de los glaciares con imágenes multiespectrales Landsat de cada año, mediante el cálculo del índice diferencial normalizado de agua en el software QGIS, para ser correlacionada con los principales elementos del clima de la zona. Como resultados del análisis, se determinó una reducción de área glaciar de 64%, presentando una correlación más fuerte con el incremento de la temperatura máxima, en comparación con relaciones más débiles frente a una temperatura mínima estable y precipitaciones fuertemente fluctuantes con una ligera tendencia incremental. Se concluye que existe una marcada tendencia de pérdida de masa glaciar, reduciendo al nevado Coropuna a menos de la mitad de la máxima extensión que presentó en 1989, siendo más acentuada en el Nevado Solimana que mantiene apenas un 4% del área que tuvo ese mismo año. Asimismo, en el periodo previo o inicial de un evento El Niño-Oscilación del Sur de fuerte intensidad se presenta una recuperación temporal del área glaciar, pero es seguido de un periodo con fuerte pérdida de masa glaciar por incremento de temperaturas y precipitaciones líquidas durante la etapa de mayor intensidad del evento.

  Acceso abierto
• Proposal to Reduce Transfer Time Through a Multimodal Interconnection Model

  Ramos Illaconza, Oscar Gianfranco; Cotos Caldas, Jeanpaul Vladimir; Lazo Benza, Omar Jesus (Springer Science and Business Media Deutschland GmbH, 2025-01-01)

  Transferring commuters on Atocongo (Lima, Perú), between Linea Amarilla (buses) and Line 1 of the Lima Metro (subway) shows various challenges. Commuters have to board the buses on the street, after crossing crowded roads, there are also interruptions like street vendors, crowded sidewalks, and lack of traffic signals at crosswalks. The transfer time is not optimized and the actios is not safe for commuters. This research proposes a multimodal interconnection that reduces transfer time and leads users directly between both transportation systems, on both routes: From Santiago de Surco (SS) and San Juan de Miraflores (SJM). The transfer time was obtained (current situation) and a model was developed with the interconnection infrastructure of both transport systems (proposed situation). From the comparison of both situations, it was obtained that the times were reduced, for the route from SS 49.87% and for the route from SJM 28.87%. It is concluded that the proposed model manages to reduce the user's transfering time.

  Acceso restringido temporalmente
• Influence of Recycled Concrete and Ground Glass on the Compressive Strength of Concrete at 7 and 28 days

  Cordova, Jaime; Quispe, Marcell; Serrano, Malena (Springer Science and Business Media Deutschland GmbH, 2025-01-01)

  The main objective of the article is to assess the influence of using recycled aggregates on the compressive strength of concrete (f'c = 175 kg/cm2) at the age of 7 and 28 days. Specifically, the study focuses on the partial replacement of natural coarse and fine aggregates with recycled counterparts. To achieve this, recycled concrete from the demolition of columns in Villa el Salvador, Lima—Peru, was utilized as a substitute for the natural coarse aggregate. Additionally, ground glass sourced from glass shops in the Center of Lima was employed as a substitute for the natural fine aggregate. Three mixtures were designed following the ACI method: CC, representing conventional concrete; D1, denoting concrete with a 30% substitution (20% recycled concrete and 10% ground glass); and D2, indicating concrete with a 50% substitution (30% recycled concrete and 20% ground glass). Subsequent to the formulation of these mixtures, quality verification tests were conducted on the fresh concrete, and cylindrical specimens measuring 10 × 20 cm were created for sampling. After 7 days of curing, the specimens underwent compression tests, revealing strengths exceeding 65% of the design strength and after 28 days, strengths greater than 100% of the design strength.

  Acceso restringido temporalmente
• Procedure to Improve Execution Speed Through Optimized Planning with Lob, Lps and Bim Methods in a Multifamily Building in Metropolitan Lima

  Pereda, Nicholas; Ríos, Jairo; Ulloa, Karem (Springer Science and Business Media Deutschland GmbH, 2025-01-01)

  As a developing country, Peru has great limitations in the application of new and innovative technologies in the construction sector. Construction projects consist of several stages in their development, one of the most important is the planning stage, which is essential to achieve efficient execution and meet established deadlines. However, this stage is usually tedious and complicated to carry out since there are multiple factors that can affect the estimates obtained from the planning process. However, the deadlines for the execution of construction projects are tight and failure to comply generates large losses of money. That is why this article seeks to implement the Lines of Balance (LOB), Last Planner System (LPS) and Building Information Modeling (BIM) methodologies to the traditional procedure. First, surveys were conducted on three different construction projects to determine the traditional planning process. Secondly, a procedure is developed to integrate the 3 aforementioned methodologies. Finally, the process was applied in a building project. A comparative analysis was carried out between the current state of the project and the state after using the aforementioned procedure. As a result, execution speeds increased for the items that maintained the same amount of work, the amount of m3 of slab emptying increased by 33.33%. It was observed that in the planning and work execution phase, the procedure improves the speed of execution of the items.

  Acceso restringido temporalmente
• Evaluation of the Permeability of Concrete with the Addition of Glass Powder

  Josias Mikhail, Castillo Prado; José Sandro, Gomero Tello; Nayda Susana, Morales Galiano (Springer Science and Business Media Deutschland GmbH, 2025-01-01)

  The article presents the usefulness of implementing the use of recycled glass powder, after having carried out the permeability test, evaluated at the age of 28 days. This with the purpose of seeking a sustainable and low-cost alternative to improve the durability of concrete exposed to humid climates compared to conventional concrete. The influence of pulverized glass shows a positive impact on the mechanical properties of the concrete at the age of 28 days, through the permeability test. In a comparative study it is shown that adding glass powder produces workable samples obtained according to the slump test. On the one hand, being in a humid climate, water infiltration was measured due to the humidity of the concrete. For this purpose, the permeability test was carried out following what is described in the American standard ASTM C107. On the other hand, it was analyzed that powdered glass can improve the properties of concrete, since it has a positive contribution to the properties analyzed and achieving a waterproof concrete with a dosage of VP05. This brings benefits in the construction sector not only in improving the properties of concrete, but also in making more sustainable concretes.

  Acceso restringido temporalmente
• Comparative Analysis of the Seismic Performance of a School with Metallic and Viscous Fluid Dampers in Lima, Peru.

  Loayza, Gabriela Alcantara; Hidalgo, Daniel Cristopher Solis; Huayra, Ruben Anccasi (Springer Science and Business Media Deutschland GmbH, 2025-01-01)

  The coastal zone of Peru is exposed to a high seismic risk, and many essential constructions in the country still lack seismic protection systems. This increases the likelihood of these structures experiencing considerable damage in the event of a severe earthquake, potentially leading to collapse. The present research proposes the implementation of Taylor-type viscous fluid dampers and Bozzo-type Shear Link metallic dampers, through two different designs applied to the same case study involving a reinforced concrete structure in the pavilion of a typical school built on soft ground in Lima. For this purpose, a spectral modal dynamic analysis of the building without dampers was conducted, as well as a linear time-history dynamic analysis of the structures with dampers. The results of these analyses provided the displacements and drifts of the structures. It was observed that the conventionally designed structure does not exhibit adequate structural behavior in the face of a severe earthquake, unlike the structures with damper implementation, which showed a significant reduction in their drifts and displacements. However, it was emphasized that the structure with the implementation of metallic dampers exhibited better structural behavior compared to the structure with viscous fluid dampers.

  Acceso restringido temporalmente
• Comparative Study of Seismic Performance of SLB, TADAS and Viscous Fluid Energy Dissipators in Hospitals

  Bocanegra, Fabiana; Cervantes, Romina; Casas, Joan R.; Delgadillo, Rick M. (Springer Science and Business Media Deutschland GmbH, 2025-01-01)

  Structural damage not only causes material losses but also human losses, especially in the case of essential buildings such as health facilities, as they must ensure the provision of medical services during and after an earthquake. On the other hand, Peru is a highly seismic country due to its location on the western edge of South America, an area where the Nazca and South American tectonic plates converge. For this reason, it is essential to reinforce these infrastructures with devices that help prevent and reduce damage caused by earthquakes and guarantee the safety of the hospital. This paper studies the seismic performance of three energy dissipators: Shear Link Bozzo (SLB), Triangular Plate Added Damping and Stiffness (TADAS) and viscous fluid; incorporated into an existing hospital in Peru. The methodology involves modeling these three devices using ETABS software and evaluating the following study cases: (i) without energy dissipators, (ii) with the three seismic devices evaluated separately. Non-linear time-history analysis is conducted, considering seven seismic records compatible with the response spectrum constructed from the parameters of the Peruvian Standard E.030. Finally, it was concluded that the viscous fluid dissipator is the best option to implement in the hospital since the maximum drifts, accelerations and shear forces on each floor were reduced by 45, 23 and 27%.

  Acceso restringido temporalmente
• Study of Internal Flow in a Liquid Nitrogen Flow Decelerator Through Swirl Effect Consisting of a Jet-Type Cryogenic Injection System for Food Freezing

  Arriaga, Ian; Sayán, Jasuo; Ronceros, Julio; Klusmann, Mirko; ALBATRINO, RENZO; Raymundo, Carlos; Zapata, Gianpierre; Ronceros, Gustavo (Multidisciplinary Digital Publishing Institute (MDPI), 2024-12-01)

  This article addresses the study of internal flow dynamics within a cryogenic chamber designed for freezing food using liquid nitrogen injection. The chamber features a circular section with strategically placed jet-type atomizers for this purpose. The primary objective is to extend the residence time of the cryogenic fluid within the chamber to ensure uniform and effective freezing of the passing food items. This is achieved by inducing a swirl effect through strategic deceleration of the flow using the atomizers. The meticulous placement of these atomizers at periodic intervals along the internal walls of the cylindrical chamber ensures prolonged recirculation of the internal flow. Internal temperature analysis is crucial to ensure the freezing process. The study is supported by numerical analysis in CFD ANSYS to assess the dynamics of the swirl effect and parameters associated with the nitrogen–air interface, from which we obtain a sophisticated analysis thanks to the design of a hexahedral mesh made in greater detail in ICEM CFD. This approach aims to understand internal flow behavior and its correlation with the complexity of cryogenic system design, utilizing variable nitrogen-injection pressures and strategic atomizer placement as fundamental parameters to optimize system design.

  Acceso restringido temporalmente
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  Correction to: Exploring effects of supplementary cementitious materials on setting time, strength, and microscale properties of mortar (Discover Applied Sciences, (2024), 6, 11, (583), 10.1007/s42452-024-06180-x)

  Romero, Lenin Miguel Bendezu; Bahrami, Alireza; Awoyera, Paul O.; Fadire, Oluwapamilerin; Velarde, Alan Yordan Valdivieso; Mydin, Md Azree Othuman; Arunachalam, Krishna Prakash (Springer Nature, 2024-12-01)

  In this article some of the authors’ details were incorrectly published, as listed below. The fifth author’s family name, Velarde, was incorrectly written as Valarde, and the author’s affiliation was incorrectly specified as ‘Department of Civil Engineering, Universidad Peruana de Ciencias Aplicadas, Lima, Peru’. It should be ‘Department of Civil Engineering, Universidad César Vallejo, Lima, Peru’. The fourth author’s affiliation was incorrectly specified as ‘Department of Civil Engineering, Prince Mohammad Bin Fahd University, Al Khobar, Saudi Arabia’. It should be ‘Department of Civil Engineering, Covenant University, Ota, Ogun State, Nigeria’. The last author’s email address ([email protected]) was missing. The original article has been corrected.

  Acceso abierto
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  Avances sobre ergonomia en tareas de paletizacion

  Escobar Galindo, Carlos Manuel; Mendoza Correa, María del Milagro (2014-12-31)

  Objetivo: El siguiente estudio de revisión bibliográfica se propone como objetivo general evidenciar con bibliografía actualizada, estudios que nos permitan comprender la magnitud del riesgo que afronta el trabajador frente a las demandas que exige las tareas de paletizado, a nivel biomecánico, fisiológico y riesgos relacionados al trabajo así como el beneficio de la implementación de apoyos mecánicos. Material y Métodos: Se realizo una búsqueda bibliográfica en los diferentes motores de búsqueda: Google académico, HINARI, revista APPLIED ERGONOMICS de editorial Elsevier y revista ERGONOMICS de Taylor & Francis, así mismo también se usaron textos de consultas actuales sobre ergonomía y biomecánica. Resultados: Se evidencian que la carga física biomecánica al paletizar es alta sobretodo en trabajos donde los trabajadores no tienen experiencia, así mismo la forma de la caja, el tamaño, la distancia de paletizado, la frecuencia y el modo operatorio afecta notablemente el riesgo de lesión en columna lumbosacra así como incrementa el nivel de gasto energético. Se adoptan los criterios establecidos por NIOSH (1994) que establecen no sobrepasar el 50% de la capacidad aeróbica en tareas que duren menos o una hora, el 40 % en tareas que duren entre 1 y 2 horas y el 33% en tareas que duren entre 2 a 8 horas. Conclusiones: Las técnicas posturales empleadas por trabajadores experimentados no garantizan una protección elevada contra el riesgo de lesión de columna, sin embargo las técnicas son mejores y mas estables para disminuir el riesgo que en los trabajadores no experimentados. El costo beneficio es un factor importante al momento de buscar soluciones para justificar el gasto, en el estudio presentado sobre grúas en pacientes se observa que se ahorra hasta en 70% en costos directos e indirectos al trabajador.

  Acceso abierto
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  Bending Response of Doubly Curved Laminated Composite Shells using Hybrid Refined Models

  Monge, J; Mantari, J; Yarasca, J; Arciniega, R (IOP Publishing, 2019-02-26)

  This study presents a static analysis of laminated composite doubly curved shells using a refined kinematic model with polynomial and non-polynomial functions. In particular Maclaurin, trigonometric, exponential and zig-zag functions are employed. Refined models are based on the Equivalent Single Layer theories and obtained by using Carrera Unified formulation. The shell model is subjected to different mechanical loading such as bi-sinusoidal, uniform and point load. The governing equations are derived from the principle of virtual displacement and solved via Navier-Type closed form solutions. The results are compared with Layer-wise and higher-order shear deformation solutions available in the literature. It is shown that refined models with non-polynomial terms are capable of accurately predicting the through-the-thickness displacements and stress distributions with a low computational effort.

  Acceso abierto
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  Stabilization of Pavement Granular Layer using Foamed and Emulsified Asphalt under Critical Low Temperature Conditions

  Sánchez, J; Shoji, N; Lazo, G (IOP Publishing, 2019-02-26)

  One of the efficient techniques that is currently used in pavement engineering to improve the stress–strain response conditions of the pavement structure includes the stabilization of its structural layer components. There are several laying techniques that include the usage of stabilizing agents such as emulsified and foamed asphalt. In these technologies, the temperature of the environment is observed to play a critical role. This condition is often considered to be the main factor that encourages the usage of foamed asphalt for stabilization. Further, the aforementioned technique specifies that, at temperatures of approximately 10 °C or lower, the asphalt particles are not effectively inserted in the foamed granular material mastic; they are instead merged with other asphalt particles. This causes an agglomeration of coalesced asphalt, prevents adequate foaming, and hinders the pavement layer from compaction. In such a situation, the pavement will exhibit a structural strength deficiency. Therefore, this study experimentally investigates the environmental temperatures at which an efficient layer that is stabilized using foamed asphalt may be obtained both in the laboratory as well as in the field. Further, this study proposes a new limit. Apart from exceeding this temperature limit, the study also offers an alternative with respect to the usage of asphalt emulsions to stabilize the granular layer. This technique comprises the dispersion of asphalt particles in an aqueous medium; however, when this technique is applied at low temperatures, the low temperatures do not allow the system to reach a critical condition of inapplicability, which is observed when the asphalt foam is used for stabilization. Further, the mechanical behaviors of the foamed pavement at temperatures of lower than 10 °C are discussed. Additionally, this study exhibits the results of stabilized layers that use a slow-setting asphalt emulsion (CSS-1h) as a solution to the temperature problem that is associated with the usage of the foaming technique. The investigation is performed based on a project that is conducted in the extremely low temperature areas of the Peruvian Andean highlands, which are located at an altitude of 4,000 to 5,000 meters above the sea level.

  Acceso abierto
• Storage management model based on Lean Warehouse Management and Systematic Layout Planning

  Marcelo-Alfaro, Emma; Rodríguez-Escobedo, Santiago; Moore-Torres, Rosa; Torres, Carlos (Latin American and Caribbean Consortium of Engineering Institutions, 2024-01-01)

  The logistics and storage sector in Peru has experienced significant growth due to increased imports and the trend among companies to outsource their storage processes. This article addresses the challenge of enhancing warehouse efficiency, particularly in the picking and location processes, through a warehouse management model. The methodology employed includes a company diagnosis, Value Stream Mapping, the 5S methodology (a Lean Warehouse Management tool), and Systematic Layout Planning. These approaches aim to improve inventory management and human resource utilization to reduce late order rates. This research demonstrates the application of Lean tools in warehouse management, an innovative concept in Peru, with positive outcomes: reducing the late order rate from 14.69% to 3.71%. Moreover, it proves economically viable with a positive net present value (NPV) of S/. 12,659 and an internal rate of return (IRR) of 45.03%. This study contributes to promoting research for enhancing warehouse processes in Peru, addressing a gap in scientific literature on this topic.

  Acceso restringido temporalmente

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