Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

Hallervorden-Spatz syndrome is a rare, autosomal recessive neurodegenerative disorder characterized by large deposits of iron in the basal ganglia, which causes great motor and mental loss. It presents two forms of manifestations: the classic, which arises in childhood in the first decade of life; and the atypical, whose clinical manifestations appear later, between the second and third decades of life. The objective of this study was to describe a clinical case of endodontic outpatient treatment of a female patient, 28 years old, with classic manifestations of the syndrome, showing color change in element 11 with periapical lesion, justifying the indication for endodontics. The dental care of a rare neurodegenerative disease in an outpatient setting requires the dental surgeon's knowledge so that it is conducted efficiently and safely.  

Humans have always sought comfort in various aspects of their day to day, thermal comfort is one of those since it directly affects their performance activities they carry out, it can improve or worsen these daily activities. The search for thermal comfort in the spaces where we live, leads, in many cases, to excessive electrical consumption due to poor design planning of the structure where we live, where high temperatures remain throughout the day and force us to use air conditioning equipment to achieve thermal comfort. In this research we seek to increase the energy efficiency of a building, reducing internal solar gains through DesignBuilder simulations of different scenarios that combine the use of tree planting: an environmentally friendly passive method which uses trees as a barrier between solar rays and the building with the green structure index, which takes into account the pattern with which the trees are planted to reduce the electrical consumption of the building by lowering its internal temperatures. This is supported by other optimization techniques that use certain construction parameters of the building, to get more out of it from its design. The use of trees has proven to be efficient in reducing electricity consumption in buildings, mainly when they are used to block the sun’s rays that fall on the windows, which are the main source of internal temperature gains.

Objective:  to evaluate two drainage rates (DR) (10% and 30%) for their effect on the yield and quality of sweet pepper cv. Nathalie grown under greenhouse conditions in two seasons (dry and rainy).  Methodology:  the crop was grown on coconut fiber as a substrate, and managed with fertigation, and the following variables were evaluated: number of fruits per m2, fruit weight (g), yield (kg/m2), and percentage of total soluble solids (°Brix).  Results:  With 30% DR, a significantly higher number of fruits per m2 and yield was obtained for the first and commercial qualities, compared to 10% DR.  In the rainy season, the number of fruits per m2 and the yield were significantly higher for the first, second, commercial and total qualities, compared to the dry season.  The DR did not affect the weight of the fruit or the percentage of total soluble solids.  Fruits produced in the dry season showed a higher percentage of total soluble solids, compared to the rainy season.  Conclusions:  Under the conditions in which the trial was carried out, in the dry season it is recommended to grow sweet pepper with 30% DR, while in the rainy season it is recommended to use 10% DR in order to save water and nutrients, and thus increase the crop profitability without affecting yield.

Investigations of piles subjected to axial and lateral loads have resulted in the development of specialized software for modeling pile behavior to estimate possible displacements and effects on the structure. However, these softwares have a high cost that makes them inaccessible to university students or young civil engineers. Considering this, the objective of the research is to present the methodology used for the analysis of piles subjected to axial-lateral loads, with the possibility of being implemented in programs such as Microsoft Excel or Matlab programming languages.  The methodology is conceptualized in different texts that deal in depth with the subject of lateral loads in piles, so some relevant aspects are presented together with the governing equations that must be applied by means of the finite difference method. The results generated from the above methodology were compared between the Matlab programming language and the Microsoft Excel program, and subsequently with the results of a centrifugal test published in a doctoral thesis. Within the different characteristics of each technique used, favorable results were obtained in the curves obtained. The purpose of this article is to provide a reference source for the analysis and calculation of lateral loads, which play an important role in the design of civil buildings, coastal and oceanic structures.

The university plays a preponderant role in the training of professionals with a high capacity for innovation who are capable of having an impact on society. In order to carry out this mission effectively, it has to establish strategic alliances with the company, the government and society. This paper deepens the conceptualization of this relationship and the models described in the literature, emphasizing the particularities of the Sábato Triangle, the Innovation Systems and the Triple Helix Model which, according to the literature consulted, are the most recognized, studied and applied. To carry it out, it was necessary to review the extensive scientific bibliography associated with the subject to identify the one that would contribute to fulfilling its objective and that, in addition, would be pertinent, updated and from sources recognized for their expertise in the subject. As a result, the relationship models that have been most applied in practical experience with their relevant characteristics are presented.

This study aims to determine the generation and composition of solid waste in a rural parish in the Ecuadorian Amazon. The random sampling method and the guidelines of the Pan American Health Organization were used. Waste generated in 51 households was sampled during two weeks in 2015. The daily per capita generation of solid waste in the parish of Fátima is 0.511 kg/inhab/day. Organic matter represents 66% of the generation of solid domestic waste in the parish, 9% is plastic, 7% glass and paper/cardboard, 1% metals, among others. The results show that the recovery of the organic fraction in composting processes and the recovery of materials from recyclable fractions could be management alternatives, which could generate an annual average gain of US $8044.20 that could be used to improve waste management infrastructure.

Social and economic growth greatly influences the increase in energy demand, mainly the cooling thermal load. As an ecological material, bamboo has been used as a construction element in ancient times. Therefore, this study was conducted to evaluate the energy performance of bamboo-based enclosures in a residential building under the tropical climate of Panama City. Through a literature review, the thermal properties of three bamboo configurations were obtained. These data were uploaded to the DesignBuilder software, where the model of the residential building was located. Simulations were performed under a parametric analysis evaluating the input variables consisting of 11 envelope materials formed by conventional building materials and bamboo biocomposites. The output variables were the thermal loads through the roof, walls, and ceiling and the hours of thermal non-comfort at 80% of ASHRAE 55 accessibility. For the hottest month (March), the thermal load through walls for the three bamboo configurations was 48 KWh, three times lower than the thermal loads through walls with conventional materials. The thermal loads through the roof and ceiling were negligible since the design with conventional roof materials favors heat loss. Constant annual comfort conditions and reduced heat loads in the residential building were achieved.

Final energy is used to develop any activity in different areas such as education, health, agriculture, food production, water supply, industry and residential. Therefore, the conversion of primary energy and the technology used for this purpose are key to future sustainability. That energy supply reaches all regions of the world, specifically in isolated areas, is an indicator of human development. This paper analyzes the coverage of domestic demands (drinking water, heating, cooling, and electricity) with polygeneration systems in a house in an isolated area as a case study. Two schemes using renewable energies are proposed, one based on solar energy and biomass (thermal) and the other on solar energy (electrical). The case study is located in the Mediterranean area, Tarragona. The work methodology begins with the review of the state of the art and study of polygeneration systems (configurations, technologies used and comparison of results). Then, two models were made in the Engineer equation solver (EES) program. This program made it possible to calculate the results necessary for the comparison of the two systems. The average values for a winter, spring, summer and autumn day were used for the relative comparison in the analysis of the results. Finally, for the demands supplied, a numerical analysis was performed to obtain the energy yield. This work can be interesting as a reference for future projects focused on supplying, on a small scale and with renewable energies in isolated areas, all the demands of an isolated single-family house.

This work summarizes the activities developed in the implementation of an augmented reality (AR) application for the recognition and how to use electrical equipment. The objective of this project was to improve the educational quality of students belonging to technical and technological careers in the field of electricity. The proposed methodology collected technical information of the electrical equipment and modules used in the learning process in electricity. The information was digitized to be accessible through the AR application. The final user could focus on the module or equipment through their smartphone and the information was displayed on the screen. The data also showed a menu of options for each component of the equipment or module. The results obtained on the use of the application reported the satisfaction of the final users who processed the knowledge better using interactive resources. The understanding of the users was superior compared to traditional teaching. Furthermore, it overcame general problems such as the scarce interaction of the users with the educational resources or the insufficient availability of the modules where there are a significant number of students. Therefore, it was concluded that AR application with its interactive resources surpassed the shortcomings of traditional education, generating satisfactory and lasting results in the learning process for technical majors.

The objective of this research is to evaluate whether an improvement in compressive and flexural strength can be obtained by substituting a percentage of the fine aggregate of a concrete mix with ground recycled glass. The methodology used consisted of making a conventional concrete mix as a control mix of f´c=28 MPa and its comparison with two mixes with the same design, but with 10% and 15% replacement of the weight of fine aggregate by ground recycled glass. Based on the ASTM technical standards, a total of 75 concrete cylinders were made to evaluate the compressive strength at test ages of 3, 7, 14, 21 and 28 days; and a total of 18 beams to evaluate the flexural resistance at test ages of 3, 14 and 28 days. For each test age, both in compression and in flexion, there was an increase in resistance in the mixes with 10% glass as a fine aggregate replacement compared to the control concrete mix; however, this increase was not significant for flexural strength. The mixes with 15% glass as a fine aggregate replacement presented lower resistances than those of the control concrete mix. It is concluded that the ideal replacement percentage for this study is 10%; since 15% negatively affected the resistance of the concrete.