There were no studies about the structure of the international fresh blueberry market in developing countries for contributing to the development of strategies and policies for the production, imports, and exports of fresh blueberries in the involved countries. The purpose of the study was to evaluate the structure of the international fresh blueberry market in the period 2001–2020. The research design was non-experimental, and longitudinal, with trends on per capita consumption, the market concentration index, and a multiple linear regression model. It was concluded that per capita consumption is led by Canada and the USA and that the concentration indices of the four main countries [CR(4)] of production, imports, and exports went from very high concentration levels to high concentration levels. The eight main countries [CR(8)] of production and exports were at a very high level and imports went from a very high level to a high level; in addition, the Herfindal–Hirschman-Index (HHI) of production was at a highly concentrated level: (a) highly concentrated level in imports in the period 2001–2018, (b) moderately concentrated from 2019 in imports, (c) highly concentrated in exports in the period 2001–2009, (d) moderately concentrated in exports in the period 2010–2018, and (e) not concentrated in exports as of 2019; in addition, the multiple linear regression model showed that per capita consumption, market share, price, and production contribute with 94.3% of the explanation of the variability of fresh blueberry exports. Finally, it was recommended to study the blueberry consumption habits and access restrictions to other international markets for increasing blueberry exports.

The knowledge of the tendencies of the drinking water treatments was changing through the previous decades and it is necessary to improve it for the benefit of the human beings. In this sense, the purpose of the study was to develop a scientometric study about the drinking water treatments in the period 2010–2020 for providing the state of art of the studies about the drinking water treatments in diverse knowledge areas and new orientations for future research. For this purpose, a search of the information was performed both in the Web of Science (WoS) and Scopus databases, and all articles and reviews related to the field of water treatment or chemistry were included. The results showed that China, the USA and the Netherlands have the majority of the most cited publications and various related multidisciplinary topics, such as infrastructure, technologies and pollution. Therefore, the study allows concluding that there is a need for research on different technologies that contribute positively to obtaining quality water for consumption and for the use of routine activities, being the combination and integration of the different treatment processes a challenge for future studies.

The guarantee of access to safe drinking water for rural communities is a great challenge due to the increase in contamination and deterioration of water sources. Rural areas face technological, financial, and operational limitations, having poor water quality, generally. The purpose of this study was to evaluate the efficiency of a vertical tubular flocculator (VTF) to be used as part of the purification process in rural areas where small flows are used. An experimental treatment system (ETS) implemented in the field was used. The VTF was implemented using PVC pipes and fittings. Tests were carried out with the same raw water used from a conventional treatment plant with aluminum sulfate as a coagulant. The optimal coagulant dose applied in the ETS was determined by the jar test. In the VTF, the length, turbidity, and flow of the raw water were varied. The hydraulic behaviour of the VTF was evaluated with the analysis of the time distribution curve of concentration of a tracer applying the Wolf-Resnick model. A low residence time VTF was obtained, representing a new efficient flocculation model for the reduction of turbidity and colour. The results showed that the turbidity of the raw water, the residence time, and the degree of agitation are important parameters in the operation and efficiency of a VTF. There was a predominance of plug flow in the reactor. The obtained results were compared with the efficiency of a conventional water treatment plant used in the study site. The results obtained indicated that this ETS that integrates a VTF with settling and filtration can be a useful tool for rural areas. It was recommended to replicate this study with wastewater, other dimensions of the VTF, to establish a specific methodology for the design of the VTF, to evaluate the dosage with dose bombs for improving the results of VTF, and to elaborate a hydraulic model for VTF.

There were not found studies about the impact of the use of a mobile application on the diagnostic precision of anxiety, which makes it difficult to make decisions to apply this technology to improve the sensitivity and specificity of this diagnosis, which is necessary due to millions of people around the world are affected by anxiety. The purpose of the research was to determine if a mobile application improved the process of preliminary diagnosis of the anxiety disorder of patients of the psychology service in a hospital with a convenience sample of 23 patients. The results of the study showed an improvement in sensitivity (from 33.3% to 83.3%) and a decrease in specificity (from 94.1% to 82.3%) of the preliminary diagnosis of this disorder. It was concluded that the use of the mobile application together with the color psychology allowed the increase of the sensitivity of the preliminary diagnosis and that the decrease of the specificity was a consequence of the better identification of patients with the diagnosis with this technological solution. For future researches, the recommendations included the use of the developed mobile application or other similar applications in other cities and countries, improving their functional and technical characteristics, as well as to study the results of the use of similar mobile applications for other psychological disorders.

El objetivo del estudio fue proponer y aplicar una metodología rápida para elaborar una línea de base del cumplimiento de los criterios de acreditación universitaria en las carreras universitarias con la percepción de los profesores y las autoridades académicas y aplicarla a una ciudad. MEBAUAC es original y ha permitido el establecimiento de una línea de base. No se encontraron metodologías similares anteriores. El instrumento de la evaluación es original y se aplicó a la evaluación del cumplimiento de los criterios de acreditación universitaria de carreras de ingeniería con una muestra de 73 profesores y autoridades académicas de carreras de ingeniería en Lima, capital del Perú. Utilizando la metodología propuesta, se obtuvieron los resultados de los siguientes criterios: (a) el conocimiento de las estrategias adecuadas de los procesos de enseñanza-aprendizaje por parte de los profesores, (b) la implementación de programas de bienestar (biblioteca, artes, atención de la salud, recreación actividades, etc.), (c) planificación a largo plazo, (d) elaboración de planes de estudio de acuerdo con los requisitos del mercado laboral, (e) aplicación de estrategias adecuadas para los procesos de enseñanza-aprendizaje, (f) tutoría, (g) extensión universitaria y proyección social, (h) espacios y equipamiento y (i) relaciones con grupos de interés. Las investigaciones futuras sobre la evaluación del proceso de acreditación deben tener en cuenta los enfoques para las escuelas universitarias, las autoridades gubernamentales y los investigadores interesados.

The purpose of this paper was to propose a framework for solving conflicts of mining projects, based on the inclusion of: (i) the alignments to the project management framework of the Project Management Institute; (ii) the implementation of an Integrated Sustainable Development Program; (iii) a public surrender of accounts and (iv) the continuous audit processes by internal institutions and by external, independent and international institutions. This proposed framework was contextualized to a conflict with a specific mining project; however, a generic solution framework is presented. Finally, some recommendations for future researches were proposed.