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.

On the asymptotic solutions of the coupled quasiparticle-oscillator system

Abstract: A coupled quasiparticle-oscillator system is considered for an arbitrary number of excitons. The exciton dynamics is described in terms of the second quantization (i.e. by means the bosonic operators). As a consequence a radius of a Bloch sphere is obtained different to the previous results. Some integrals of motion are obtained that allowed to reduce the system of equations of motion to a single nonlinear ordinary differential equation of the fourth order. This equation contains the energy of the system as a parameter. The fixed points are found as a functions of the energy of the system, and its stability properties are investigated. It is demonstrated that a bifurcation is presented for the energies H p . An asymptotic quasiclassical solution around fixed point for the case H >−1/2 p is obtained. The solutions around other stable fixed points can be obtained analogously. The expression for the evolution operator of the quasiparticle-oscillator system is obtained as a functional on the classical solutions.

Strong coupling of circuit and field solvers for simulation of rotating electrical machines

Abstract: Coupled circuit-field solutions provide a powerful tool to simulate the detailed behavior of electrical machines and other magnetic devices operating as part of a larger system. The coupling of both domains can be made inside a single analysis tool, or it may be attempted by combining two separate-domain programs, thus taking advantage of the individual strengths of existing numerical codes. In this paper, a scheme to implement the latter type of coupling is presented, which extends a previously proposed static method to consider movement of the rotor or some other moving part. The system-level simulator is the Alternative Transients Program (ATP), and the magnetic field solver is FLD. The proposed scheme provides a strong coupling between circuit and field variables and therefore is free from the stability problems which often arise in weak coupling schemes. The method is applied to a test rig resembling a switched reluctance motor, and the results are compared with published measurements.

Improved Graph Model for Interdependent Gas and Electricity Critical Infrastructures

Abstract: Interdependence between gas and electricity transmission networks is a subject of concern due to the expanding use of gas for electricity generation in combined-cycle power plants around the world. This paper proposes a novel and much more accurate representation of natural gas and electrical networks based on graph theory, which includes all the assets of both systems and their couplings and offers a more realistic topological model of the two coupled networks. The representation is proposed as a scale-free graph and is mathematically validated in test networks, finding that the representations maintain the same characteristics of traditional graphs, but with more topological detail of the infrastructures.

Comparative analysis of enzymatic activity of tannase in non-conventional yeasts to produce ellagic acid

Abstract: Non-conventional yeasts represent an alternative for microorganisms that are capable to produce the enzyme Tannase (EC 3.1.1.20), which has many applications is the food and pharmaceutical industry as it stands out for its ability to produce ellagic acid out of the enzymatic hydrolysis of ellagitannins. Ellagic acid has been studied in the medical area for its action against various diseases, as is the case of cancer or heart problems. The investigation was conducted to evaluate seven non-conventional yeasts - Debaryomyces hansenii PYC ISA 1510, Debaryomyces hansenii PYC 2968, Candida parapsilosis, Candida utilis, Pichia pastoris, Pichia kluyveri, Issatchenkia terricola - as producers of the enzyme tannase. This was done in mediums of fermentation with tannic acid (1-3%) and YPD without tannic acid, to determine the activity of the enzyme by two spectrophotometric methods, the first being with rhodamine and the second with methyl gallate, to detect the presence of gallic acid as a product of the hydrolysis of tannic acid. The main results showed that the evaluated non-conventional yeasts all presented activity with the Tannase enzyme, obtaining better detection results with the rhodamine technique for the stability of the formed complex, which gives more precision of the obtained data.