This paper aims at encouraging the use of laser treatment as an environmentally friendly technique to improve the mechanical properties of metallic materials over conventional quenching and tempering techniques through the study of the tribological behavior of AISI 1538 MV steel subjected to surface laser quenching treatment. Sliding wear tests were carried out by the pin-on-disk method. In order to identify the wear mechanisms, the worn surfaces on the disks were evaluated by scanning electron microscopy and the wear scars on the ball were observed by optical microscopy. Results reveal that laser treatment reduces the average friction coefficient by 25% and the wear rate by 60% compared with those achieved by the conventional methods, while the depths of the wear track and hardness of the cross section and surface are maintained.

The refrigeration systems are of great importance in the daily life of the human being, due to the fact that it is necessary to have cold storage systems for different processes and perishable products preservation. The generated electric power as an alternative source has been used for refrigeration systems involved in sustainable development programs. The aims of this research were to characterize a cooling system powered by solar panels and that pretend to improve the quality of life. Refrigerating machines that use alternative sources of energy contribute to sustainable development, however, those that do not use it have a greater environmental impact. The solar refrigerator prototype has a quantitative-qualitative approach in deductive processes based on interpretation and data collection. This was carried out using own materials for the refrigerators construction that allow obtaining a compact configuration, presenting, pressure-volume operation curves and autonomy of the system with maintenance similar to conventional refrigeration systems. The refrigeration system is intended to be used in marginalized areas, low-income organizations and in support unprotected populations.

The use of hydrogen as a complementary fuel to internal combustion systems search to obtain automotive machines with individual parameters for sustainable development, providing the hydrogen amount required to be used in diesel cycle engines. The aims of this investigation are to use a dry hydrogen cell prototype to quantify the amount released that is optimal for energetic supply to the diesel cycle in standard operating conditions. This research was conducted under a mixed approach, using an experimental, systematic, descriptive, explanatory, correlational, empirical and in a field context, the variables considered for the development of the research are the amounts of hydrogen, diesel, oxygen, time and concentration of the mixture for the experiments. The prototype presented controlled operating conditions depending on the delivered hydrogen flow to obtain the operating curves of the diesel engine (pressure-volume, temperature-entropy), setting the necessary concentration of the mixture for optimum performance for the internal combustion cycle. The combustion systems evolution with hydrogen will tend to optimize performance when characterizing the supply in a controlled manner, depending on the torque in diesel engines under real operating conditions.

Multifunctional composite materials are becoming an important part of the energy and transportation industry, which makes composites of carbon fibers an excellent choice. The carbon fiber reinforced (CF's) with a polymeric matrix produces a multifunctional composite material, which increases its physicochemical properties and keeps intrinsic one (strength, stiffness, low density, electrochemical and piezoelectric). This research aims to implement CF's as an alternative generation source and storage of electric power applied to sustainable transport means. The used methodology has an approach qualitative-quantitative in inductive and systematic processes based on the collection and interpretation of scientific texts with objective reality analysis. CF's from petroleum derivatives have better intrinsic characteristics than those from biodegradable polymers (lignin, wool fiber and chicken feathers). The CF's characterization analysis allowed to identify the application of these as a sustainable alternative electric source and storage mean, as well as their limitations and evaluation of the power rate delivered for the design of device power systems.

The consumption of avocado is of great importance in the daily diet of the human being, since this fruit contains high levels of Omega 3 and various vitamins (B6, B9 and E) and minerals (magnesium, iron, zinc and phosphorus). Today, Mexico is one of the main avocado producers worldwide. However, the high demand and the low production of this fruit makes the price of avocado more expensive and, therefore, the Mexican population reduces its consumption and seeks nutritional alternatives. For this reason, this research aimed to propose the manufacture of solid avocado tablets (based on pharmaceutical techniques) by granulating and compacting the dehydrated powder of this fruit. This was carried out under a mixed approach by applying quantitative and qualitative technologies to systematic, critical and empirical processes in order to choose the best granulation technique, the ideal binder and the type of compaction to use to achieve solid tablets using dehydrated avocado powder. This tablet aims to preserve the same nutrients as natural avocado and reach all sectors of the population to generate a sustainable and human survival environment.