Cu(I) removal using mesoporous silica (UGM-triamin)

This paper shows the syntheses and use of hybrid porous silica materials (UGM-triamin) in the adsorption of Cu (I) of the cyanidation effluents of gold and silver. Studies of adsorption of Cu (I) in synthetic solutions of Cu-CN a pH of 11 and at a concentration ratio of 1: 5 Cu: CN, simulating the effluents of cyanide process gold and silver ores, showed maximum adsorption capacity of 7.54 mg of Cu (I) per gram of material and favorable adsorption according to the Langmuir model (RL of 0.31 to 0.41). The evaluation of the adsorption capacity of the material with real solutions of cyanide, showed 95% removal of copper in the effluent cyanide and 68.5% selectivity for the adsorption of copper. It has been observed free cyanide destruction in the system during adsorption of copper, so that the oxidation of free cyanide may be linked to the mechanism of adsorption of copper.

Reingeniería del modelado e implementación de simulador de reacciones químicas

This article describes the process of analysis, design and implementation of the reengineering process for the continuous improvement of a distributed system that is integrated by a suite of applications and servers that perform the processing for the simulation in 2D and 3D of chemical reactions and pattern recognition. This distributed system establishes a framework for the modeling, representation and simulation of chemical reactions through compounds and the elements of the periodic table, to support face-to-face activities mediated by technology for the chemistry subjects of the Educational Institutions Superior offered by these Educational Programs. This reengineering process was executed with the implementation of the agile SCRUM methodology for the production of the suite. This suite of applications will allow students and teachers through simulations to understand and understand the interaction of the elements with each other, providing support in real time, fundamental for the understanding of topics such as valence electrons and chemical bonds. , which will allow undoubtedly to support the training process of students

Determinación del contenido de zinc en residuos producidos durante el proceso de galvanizado por inmersión

In the hot galvanizing process, remnants are produced that must be removed to avoid a poor quality in the coating of the product. During the hot dip galvanizing process, by-products are obtained both in the tubs and in galvanizing pails, which can be reused. The objective of this study was to recover Zinc from the by- products generated during the hot dip galvanizing process. The study was carried out by characterizing the chemical composition, density, and quantity of the by-products generated during the galvanizing process, which were recovered: Zinc, dross, droplet, and Zinc fines. The monthly average of the by- products generated for one year was 6,900 kg of dross, 5,800 kg of drop and 5,300 kg of zinc fines. 6500 kg of recovered Zinc were obtained. 43% Zinc was recovered. The results were favorable to be able to carry out the recovery of the mineral. It is concluded that it is necessary to work on the recovery of Zinc, since there will be economic savings, and it will also collaborate with the care of the environment by preventing Zinc residues from going to wastewater.

Radiación fotosintéticamente activa evaluada en la ciudad de Zacatecas

The present investigation is related to one of the most important processes for the development of life on Earth; photosynthesis, an essential process in the cycle and development of living beings, centered on solar radiation that is useful for plants to carry out this process, Photosynthetically Active Radiation (PAR). The objective of this work is to generate information on the PAR through a database to collaborate in the decision-making of farmers in the area. For this purpose, a quantum sensor installed in building 6 of the UAZ Siglo XXI Campus was used. According to Abal (2013), in agricultural and production planning, it is especially important to have a detailed knowledge of incident solar radiation on the earth's surface (Abal and Durañona, 2013). When collecting, treating and analyzing the data, it was found that the daily average PAR is 819.52 μmol of photons m-2 s-1 (179.47 W m-2), if only the sunny hours are taken into account. It can be concluded that according to the PAR received in the evaluation region and the type of nutrients in the soil, other crop alternatives to those traditionally used can be sought.

Caracterización en línea de la dinámica temporal de señales para el monitoreo del sistema eléctrico de potencia

The characterization of dynamic phenomena is essential for monitoring the Electrical Power System subject to disturbances. This article proposes an On-line time systematic approach to analyze and characterize the temporal evolution of transient and nonlinear oscillations in these systems. Two methods are used; the first method is based on a local decomposition of the signal under study into orthogonal basis functions to obtain the dynamics of transient oscillations. Next, a second method is applied to those orthogonal basis functions to obtain analytical signals and characterize the instantaneous amplitude, phase and frequency attributes of the oscillations and determine a physical interpretation of the system’s behavior. The proposed methodology is a time-frequencyenergy analysis which can be applied to the timesynchronized Phasor Measurement Units measurements. The results demonstrate that the proposed methodology provide an accurate characterization of transient phenomena with non-stationary effects.

Implementación electrónica del oscilador caótico de Rӧssler

Chaotic systems have attracted the attention of the scientific community due to their potential applications in many branches of science and engineering, chaos theory is used in cryptography, in the creation of population models in biology, studying turbulence in mechanics of fluids, in economics it is used to predict the behavior of the stock market, in astronomy it is used to describe the motion of many planetary bodies, to improve the prediction of trajectories in asteroids and to determine whether or not they come into contact with the earth, in More recent years have been applied in the prediction and / or control of the dynamics of the human brain, a large number of works have been reported in different areas in order to address some interesting problems, such as the determination of structural damage in materials or in secure communication systems. In this work the implementation of chaotic oscillators in analog electronics is addressed, the case study of the autonomous non-linear dynamic system of Rӧssler is presented, the stability analysis of the system is developed, analytical, numerical and experimental results are included, as well as its Electronic implementation measured under laboratory conditions to observe experimental chaotic attractors, which will be used in the implementation of random number generators and secure communication systems for image encryption.

Fabricación y caracterización de películas transparentes y conductoras utilizadas como contactos en estructuras MIM con películas SRO-LPCVD y SRO-HFCVD sobre sustrato de cuarzo

This work presents the manufacturing and characterization process of two types of transparent conductive oxide (TCO) films, as contacts. Aluminum doped zinc oxide (AZO) deposited with the Sputtering technique and tin doped indium oxide (ITO) using the pyrolysis spray technique, these transparent and conductive films were deposited as contacts on a film of siliconrich oxide (SRO) which was deposited by two systems of chemical vapor deposition by low-pressure (LPCVD) and by hotfilament (HFCVD) on quartz substrates with polysilicon film as metal contact, with the object of building two Metal-InsulatingMetal (MIM) structures, one with SRO-LPCVD film and another SRO-HFCVD thus highlighting the electrical characteristics of these structures. The precursors used for the LPCVD system are silane (SiH4) and nitrous oxide (N2O) and for the HFCVD system the gaseous precursors are obtained from a solid quartz source stripped with atomic hydrogen. First, we present results of the optical characterizations of the TCO´s and SRO films, the band gap obtained by Tauc to calculate the size of the nanocrystal in SRO-films, causing light spots. And I-V curves of MIM structures with interesting results.

Elaboración y caracterización Fisicoquímica de membranas bioplásticas a base de Nopal (Opuntia ficus-indica)

The objective of the research is the physicochemical characterization of bioplastic membranes based on Nopal (Opuntia ficus-indica) to determine their possible applications. The tests performed for the characterization were: permeability, solubility, resistance, thickness, drop test and chemical analysis with the infrared spectrophotometer. Today, new and better alternatives are sought in obtaining different polymers that benefit humanity and the environment. Recycling is an option but it is not a very effective alternative for all plastics, however, biopolymers are a solution from the origin of the problem since the vast majority of them their biodegradation time is much less than that of a common plastic. Biopolymers, which for the most part come from renewable resources so they become an interesting alternative for the plastics industry. The physicochemical properties of the Nopal-based membranes (Opuntia ficus-indica), are similar to synthetic plastic membranes, being a viable alternative to replace them, thus contributing to society, with a better quality of life being environmentally friendly.

Características físico-químicas y microbiológicas del compostaje de bagazo de agave tequilero a escala industrial

The aim of the present study was to evaluate some physicochemical characteristics of large scale composting process of tequila agave bagasse, and also quantify the population dynamic of bacteria, fungi and actinomycetes througout 300 days. A large windrow of agave bagasse of approximately 195 m (~331 t) was set and regularly monitored. Thereafter a pile section was reubicated to continue the evaluation. The windrow was sampled every 15 days and the following parameters were measured: moisture content, temperature, pH, electric conductivity (EC), the organic matter (OM), C/N ratio and the population dynamic of bacteria, fungi and actynomicetes in colony forming units. From the very beginning of composting the temperature of the windrow reached the thermophylic phase (>45 °C) and continued up to 270 days. However, at the end of the study the temperature felt down till 42 °C due to the reduction on moisture content (<30%). The highest EC registered was 1.5 dS/m; the OM remained between 70-35% and the C/N ratio varied between 96.9 initial and 29.6 final. Actinomycetes were the most dominant group especially in the last weeks of composting, which infers the possibility of using this type of compost in soil bioremediation.

Deshidratación de guayaba (Psidium guajava) en forma de rodaja mediante radiación solar en un secador directo

The objective of this work is to reduce the moisture content of the guava (Psidium guajava) cut in slices, through the solar radiation characteristic in the area of the capital of the state of Zacatecas. Natural convection and forced convection were used to achieve the objective of this study. The selected guava comes from the municipality of Jalpa, Zacatecas. Moisture was evaluated with an OHAUS MB45 thermogravimetric scale, then the guava slices were placed in polymer mesh trays with dimensions of 34.2 cm long and 24 cm wide. They were introduced inside a transparent dryer with dimensions of 74 cm x 80 cm of base and a frontal height of 13 cm and posterior of 40 cm. A Checktemp 1 thermometer was placed inside the dryers to evaluate the temperature in the drying process. The initial humidity of the guava was 50.51%, the final moisture obtained in the natural convection was 8.08%, while in the forced convection it was 8.32%, after 8 hours of drying.