The study of asteroidal and cometary material entering into Earth’s atmosphere has scientific and social importance. The observation and study of the impact of meteoroids with our planet is a way of studying geophysics and planetary geology without spaceships. This article describes the progress of the installation of the Mexican Meteor Network (Citlalin Tlamina). At medium and long term, the aim of this network is to cover the entire national territory with stations that allow us to record the entry of meteoroids into Earth’s atmosphere. This seeks to: a) study the meteoroid-atmosphere interaction, b) determine impactor’s physical properties; c) analyze flows and Radiant deviations of known meteor showers, d) find or ratify new meteor showers; e) recover and study meteorites, f) study the interaction of the shock wave with the ground by analyzing seismograms; g) report people in real time (or near) the occurrence of fireballs and fragmentation of meteoroids in the atmosphere, avoiding the fear of this phenomenon and provide support for Civil Protection, h) find areas of opportunity that can use the images captured by the cameras (weather, bird migration, etc.). In this paper, it is shown the prototype of the base to house the cameras whose purpose is to protect them from the environment, prevent condensation within the container and keep the cameras below 25 °C.

The objective of this research is to evaluate the design of a pair of spur gears and another analogous pair with a contact ratio of less than unity. Considering two pairs of normalized gears with equal diametral pitches and pressure angles, as well as equal pitch radii in their driving gears and equal pitch radii in their driven gears. For the first pair of gears with normalized tooth numbers, the contact ratio greater than unity es obtained. For the second pair of gears, the number of teeth is proportionally reduced, consequently obtaining a contact ratio of less than one. For both pairs, the maximum von Mises stresses are obtained using the finite element method. The pairs are compared qualitatively and quantitatively. This work contributes with novel elements of judgment for a better decision making of the industrialists interested in reducing the problems of normalized spur gears such as noise, abrasive wear, adhesive wear, temperature, and efforts induced by the overlapping relationship between coupled teeth; proposing them a practical solution that will open new avenues of research.

Objectives: To show a process to synthesize and analyze a crank mechanism oscillator function generator. Simulate it in a virtual reality environment, without losing its physical characteristic. Evaluate deviations between analytically desired and virtually obtained. Methodology: Using the analytical method described by Hartenberg and Denavit, a graphic package and an electronic spreadsheet; knowing the angle of rotation of the crank, the angular reference position of the crank, the displacement of the oscillator, the extreme values of the independent variable and the function; precision positions, link lengths, eccentricity and oscillator reference position were determined. The links were generated, the mechanism was assembled, analyzing fifteen of its positions. Of the infinite number of existing solutions, five were synthesized. For each solution that justify it, the deviation of the generated function was evaluated with respect to the desired one. Contribution: The friendly, fast, safe, accurate and parametric process was demonstrated; modifying the inputs and checking the update of the outputs, therefore it is a contribution to the scientific progress of the area.

The theory of mechanisms is one of the fundamental branches of study and development in the theory of machinery, current technological developments such as mechatronics or robotics require that engineers and researchers have solid basic knowledge in applied mechanics; this will allow reliable and efficient research. The traditional teaching in the engineering fields uses bibliography that presents in an isolated way, either the graphic or the analytical method, without establishing a clear correlation between both methodologies, which misses the opportunity for these methodologies to mutually support each other. When two methodologies complement each other, a level of security is obtained in the domain of problem solving techniques, in turn, opens the possibility of extending solutions when looking for the representation of one of the methodologies, based on the other, in this paper presents the solution of problems of the theory of mechanisms by both methodologies, explaining and justifying the results obtained, as well as the sequence of steps in the solution of problems, beyond a procedure.

As part of the development and manufacture of engine pistons used by the automotive industry, a series of laboratory tests are carried out that include: Mechanical, metallographic and chemical analysis of the material, dimensional verification, final weight and piston finishes finished, tests on the engine dynamometer of the finished product, etc. The technological development department of an automotive piston manufacturing company, as part of the quality assurance process of its products, has established the need to assess the compressive and fatigue resistance of pistons, both at room temperature and at temperature normal operation of an internal combustion engine. The equipment proposed to carry out these tests is an hydraulic servo machine, which has the capacity to apply dynamic load and static load, with which extreme piston operating loads can be simulated. For this reason, the design goal of this work is to design a device with which the test specimens (pistons) can be held in the machine, in order to perform fatigue and compression tests and in which, the heat can be heated piston at the required test temperature.