Instituto Tecnológico de Morelia

About: Instituto Tecnológico de Morelia is a education organization based out in Morelia, Mexico. It is known for research contribution in the topics: Electric power system & AC power. The organization has 498 authors who have published 572 publications receiving 4600 citations.

Optimization of Parcticle Size for Hydrolysis of Pine Wood Polysaccharides and Its Impact on Milling Energy

Abstract: Wood milling is an intensively energy consuming operation that has a significative effect on energy yield of ethanol processes as particle size is an important factor in productivity of saccharification methods. We optimized fiber particle size for a very wide range of treatment conditions (temperature, agitation, and solid loads) for acid hydrolysis in a batch reactor. We also analysed heat and mass transfer effects by calculating the Thiele and Prater modulus at experimental conditions. Multivariate optimization results show that using a length-weighted fiber mean diameter (D L21 ) of 1.21-2.68 mm a better sugar yield, concentration and lower furan production can be achieved. Agitation allowed a simulteous particle size reduction and hydrolysis of polysaccharides. Heat and mass transfer studies suggest that acid diffusion is only important for hemicellulose hydrolysis at very high temperature and that particles are nearly isothermic. These results show that about 30% of the required energy for milling can be saved by using optimal particle size.

A Control System for Static VAr Compensator Based on a Digitally Controlled Oscillator

Abstract: This article deals with the design, construction, and testing of a new control system for a static VAr compensator. The new control system is based on monitoring reactive power, which is used as the only feedback variable for a digitally controlled oscillator. In addition to synchronizing the static VAr compensator with the AC system, the digitally controlled oscillator also schedules the firing of converter valves in order to achieve the reactive power compensation level required in the AC connection bus. The control system design was initially developed in MATLAB® and Simulink® (The MathWorks, Natick, Massachusetts, USA), and then a ±1-KVAr static VAr compensator experimental prototype was built. The static VAr compensator control system was implemented in a PIC16F877 microcontroller (Microchip Technology Inc., Chandler, Arizona, USA). Computer simulations and experimental results for the static VAr compensator and its control system are presented in the article. Finally, the performance of the...

Simulations of ferroresonance in transformers using ATP (Alternative Transient Program)

Abstract: Ferroresonance is a phenomenon that is present in voltage signals in the form of aperiodic oscillations that cause transient overvoltages, mainly in transformers. This phenomenon must be considered in the design of electrical systems, since it presents high levels of distorted voltages causing damage to equipment, which makes it important to study. In this paper ferroresonance simulations are shown in ATP (Alternative Transient Program), presenting serial type ferroresonances through different scenarios, observing the behavior of voltage signals. For the presence of ferroresonance, certain capacitive values are considered in cables and power supply voltage levels of the system, in addition, the impact on the location of switches is analyzed, observing how ferroresonance behaves under different operating conditions.

Improvement of Mechanical Strength of a Hot-Worked Twinning-Induced Plasticity Steel through an Optimum Secondary Annealing Treatment

Abstract: The microstructure of the twinning-induced plasticity (TWIP) steel microalloyed by Ti (TWIP-Ti) exhibited a wide grain size distribution after applying a thermomechanical treatment The presence of fine and coarsest grains affected mechanical twinning and properties This research was directed toward elucidating the effect of an optimum secondary annealing treatment to produce a homogenous microstructure through the release of remnant energy stored during the hot deformation processing of a TWIP-Ti steel A comprehensive analysis of the effect of annealing parameters on the microstructure and its enhanced mechanical properties in terms of grain size distribution, precipitation strengthening and annealing twin fraction was performed The microstructural characterization included light optical microscopy and scanning electron microscopy (SEM) SEM line scans were performed to characterize precipitate particles found in the TWIP-Ti steel Microhardness and tensile tests were performed on the base material (as-solution condition) and post-annealing samples The Taguchi method was applied to optimize the annealing parameters Furthermore, image processing was employed to quantify the grain size distribution and annealing twin fraction The analysis results revealed that upon completion of the second stage of annealing treatment with the optimal parameters, the grain size heterogeneity decreased due to the effect of coarsest grain subdivision The low SFE of the TWIP-Ti steel, homogenous grain size microstructure and precipitation strengthening produced yield strength and ultimate tensile strength increases of 27% and 85%, respectively The homogenous grain size distribution had a more substantial effect on improving the mechanical properties than the annealing twin fraction

Pricing reliability service based on end-users choice

Abstract: Electricity has been considered as a heterogeneous product even in today's electricity marketplace. However, end-customers have different needs and preferences, such that choosing the level of availability that they are willing to pay for becomes a key issue. This paper elaborates the concept by differentiating electricity in multiple availability types and multiple types of classes.