At present, supporting e-learning with interactive virtual campuses is a future goal in education. Models that measure the levels of acceptance, performance, and academic efficiency have been recently developed. In light of the above, we carried out a study to evaluate a model for which architecture design, configuration, metadata, and statistical coefficients were obtained using four Learning Management Systems (LMSs). That allowed us to determine reliability, accuracy, and correlation, using and integrating the factors that other researchers have previously used, only using isolated models, such as Anxiety–Innovation (AI), Utility and Use (UU), Tools Learning (TL), System Factors (SF), Access Strategies (AS), Virtual Library (VL), and Mobile Use (MU). The research was conducted over one year in nine groups. The results from an LMS Classroom, architecturally and configuration-wise, had the highest level of performance, with an average of 73% when evaluated using statistical coefficients. The LMS Classroom had a good acceptance and a greater impact: SF, 82%, AI, 80%, and VL, 43%, while out of the seven factors, those with the most significant impact on academic efficiency were TL, 80%, VL, 82%, and MU, 85%.

This research obtains a mathematical formulation to determine the heat transfer in a transient state, in a calorimeter cell, considering an adiabatic system. The development of the cell was established and the mathematical model was transiently solved, which approximated the physical phenomenon under the cell operation. A numerical method for complex geometries was used to validate performance. The results obtained in the transient heat transfer in a cylinder under boundary and initial conditions were compared using an analytical solution and numerical analysis employing the finite-element method with commercial software. The study from the temperature distribution can afford, selection between a cylindrical and spherical geometry, design criteria that are generated by changing parameters such as dimension, temperature, and working fluids to develop an adiabatic calorimeter to measure the heat capacity in fluids. We show the mathematical solution with its initial and boundary conditions as well as a comparison with a numerical solution for a cylindrical cell with a maximum error from 0.075% in the temperature value, along with a theoretical and numerical analysis for a temperature difference of 1 °C.

This paper focuses on the numerical modeling of the effect of the height of a combustion chamber on the development of a reference calorimeter whose objective is to measure the calorific value of natural gas. The impacts of temperature, velocity, and mass fraction on the exhaust gases were evaluated by varying the height of the combustion chamber. The eddy dissipation concept (EDC) approach was used to model combustion with two different chemical kinetic mechanisms: one with three steps, called the three-step mechanism defined by default in the software used, and second skeletal model, which consists of 41 steps, through the ChemKin-import file with 16 species. The main result of this study is the selection of a combustion chamber height for the reference calorimeter that produces the best performance in the combustion process, which is 70 mm, as well as the main differences in using a three-step mechanism and a skeletal model to simulate an oxy-fuel combustion reaction.

Se desarrolló una máquina de desgaste del tipo Pin On Ring, bajo la norma ASTM G99-17 (ASTM Int', 2018), que permite realizar ensayos mediante un procedimiento de laboratorio para determinar el desgaste de materiales. Las máquinas de desgaste tipo Pin On Ring requieren realizar pruebas a la pieza bajo ciertas condiciones como lo son: la velocidad de giro y la carga aplicada. En la máquina presentada se pueden manipular y controlar la velocidad de giro y la carga aplicada, gracias a que se incorporan los elementos necesarios para variar la velocidad del giro del motor, esto se logra a través de un variador de frecuencia, además se desarrolló un mecanismo de aplicación de carga que permite aplicar la carga deseada durante el ensayo, esta carga es medida gracias a una celda de carga que cuantifica la cantidad aplicada durante la prueba. Durante el ensayo se genera un incremento de temperatura entre las superficies, el cual se puede medir y observar su comportamiento en el panel de control de la máquina de desgaste mediante un sensor tipo k.  Es posible obtener la tasa de desgaste de los materiales en contacto de manera automática, debido a que la instrumentación incorporada en la maquina permite calcular la distancia recorrida, con lo que se obtiene una idea del comportamiento del material bajo ciertas condiciones de trabajo.

One of the process in the textile industry is the eyelet assembly in the different products, for it is used a “Riveter”. This machine is used to place rivets on textile garments or footwear, for esthetic or reinforcement purposes. There are three types of riveters: "Manuals", "Semi-automatic" and "Automatic"; one of the problems that these presents are the manual calibration because human intervention is required. A virtual machine for an automatic textile riveter was developed using CAD software as SolidWorks where the design of the mechanical systems that integrate the virtual machine, together a visual programming software, LabVIEW, is used, in which a front panel is developed, capable of controlling the entire production process as long as there is a link between these two interfaces through "LabVIEW Soft Motion " The communication between this two software achieve to characterize a "Virtual Machine of Riveted Textile" where it is improved in the riveting of eyelets in less than two seconds, the ability to rivet 4 different sizes of eyelets and automatic calibration using a mechanical system called "LongWorth-Chuck", this contributes to an optimization of conventional riveting machines.