Gas sensors are widely used in devices known as electronic Noses. Which are used for the detection of gas leaks, environmental quality and food, etc. However, it is necessary to perform a quantitative and qualitative analysis of these sensors based on the measurement of their response to obtain their characterization. In the present work is shown the design and implementation of a measurement system for gas sensors response. Therefore, a sealed stainless-steel chamber that internally contains the sensors is designed. On the other hand, a temperature controller is implemented using a PID controller governed by an interface developed using virtual instrumentation software. Particularly, this system has the ability to measure the response of gas sensors, such as: metal-oxide and quartz crystal microbalance. The development of this project, presents an alternative to measure the response of sensors to commercial, contemplating a lower cost and same functionality. Measurements were performed at different temperatures, applying samples of ethanol, obtaining typical results in the response of this type of gas sensors. Therefore, it can be said that the system operates satisfactorily.
In modern industry, flexible manufacturing systems (FMS) are indispensable to increase productivity and product quality. The cells that constitute them have several work stations connected to each other through a communication protocol, therefore, with which they are able to identify and distinguish between the different parts or products processed in the system. Furthermore, they have the ability of adaptation to the demand of processing different products and quantities. In the FMS communication protocols are used such as Device Net, Ethernet, among others. However, there are cases in which there are no communication modules; however, it is necessary to develop alternative devices to communicate the work stations with each other to integrate a flexible manufacturing cell with the necessary characteristics. This paper presents the results obtained from the study of infrastructure for the development of a communication interface to integrate a flexible manufacturing cell using a microcontroller, with the capability of communicating two work stations. In this particular case, a FANUC M6iB robot with a HAAS VF2 machining center.
The Average Temperature Process (PAT) is modeled by an equation that is used to calculate the increase in energy needed for the refrigeration cycle, which is equivalent to the energy degradation that corresponds to the production of entropy. This work shows experimentally that the increase in entropy, taking into account the processes of heat transfer that occur in the condensation temperature and in the evaporation temperature between the mechanical vapor compression refrigeration system and the environment, is directly related to the falls of pressure presented in the suction pipe and in the compression process, as well as the heat losses that exist between the main components (evaporator, compressor, condenser and expansion throttling) and the environment. From this development, the behavior of the refrigeration cycle is evaluated in order to obtain a minimum entropy generation criterion in the main components. Analytical as well as experimental results are shown using R-134a refrigerant.
Online teaching and learning are an alternative paradigm to face-to-face education. It promotes the generation of knowledge through theoretical and methodological processes derived from the development of science and technology in the field of communication and information. With distance education, the teacher undertakes innovative strategies that promote meaningful learning. In this paradigm, the teacher as an educational subject is not excluded, on the contrary, it assumes a new role that transits towards the new culture of distance education based on the diversity of resources that the Web has. The most relevant challenges of this new paradigm are accessibility, personalized system, flexibility in study, and interactivity with better learning materials and resources.
In this work, an evaluation of the energy in a start-stop process is made by analyzing the generated irreversibilities in a refrigeration system by mechanical vapor compression with R-134a refrigerant at a flow of 1.0 L / s. This system is installed in the LABINTHAP of the SEPI-ESIME-IPN. For this analysis, there is software that captures data on the pressures and temperatures from the refrigerant at the inlet and outlet of the evaporator, compressor, condenser, and expansion valve at oneminute intervals. For the analysis of the generated irreversibilities, the first and second laws of thermodynamics were used. And, in the process evaluation of stopping and starting, it was shown that the compressor sets a trend of higher energy consumption, so a process of regulation of the refrigeration system by mechanical compression of steam is proposed.
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