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Limon A.,UACJ | Moreno M.,National Institute of Astrophysics, Optics and Electronics
2015 12th International Conference on Electrical Engineering, Computing Science and Automatic Control, CCE 2015 | Year: 2015

Hybrid energy harvesting system combining multiple sources is an alternative solution to harvest energy continuously and to increase the output power to bias the electronic systems. In this work is presented a prototype for harvesting energy, which combined three different sources. It contains a piezoelectric cantilever based on Lead-Zirconate Titanate piezoelectric transducer (PZT) in order to harvest the ambient vibrations, a solar cell for sunlight and an antenna capable to harvest ambient Radio Frequency (RF) energy. The design, implementation and characterization of the circuits for signal conversion from AC to DC for the case of piezoelectric generator, and the RF to DC for the antenna are presented. The RF harvesting circuit operates at 2.4 GHz obtaining a voltage of 71mV. The prototype is capable to generate a maximum DC power around 241.3 mW when the piezoelectric, solar cell and RF devices are connected together. Thus, the output power of this hybrid harvesting circuit is very attractive for low power electronic applications. © 2015 IEEE.

News Article | November 16, 2016
Site: adds “Global Automotive Lightweight Materials Market 2016-2020” new report to its research database. The report spread across 68 pages with table and figures in it. The Research analysts forecast the global automotive lightweight materials market to grow at a CAGR of 8.57% during the period 2016-2020. Automotive lightweight materials are of lower density than traditional automotive materials, such as iron and steel. The lightweight materials have a wide range of applications in automobiles because they not only help to reduce the weight of the vehicles, but also aid in providing enhanced automotive safety and fuel efficiency. The common lightweight materials used in the market are high-strength steel (HSS), aluminum, magnesium, plastics, carbon fiber, glass fiber, and composites, such as metal and ceramic matrices. These materials are light weight and have high strength that adds to the suitability of these products. Browse full table of contents and data tables at Covered in this report The report covers the present scenario and the growth prospects of the global automotive lightweight materials market for 2016-2020. To calculate the market size, the report considers the revenue generated from the sales of lightweight materials to original equipment manufacturers (OEMs) and automotive manufacturers. The market is divided into the following segments based on geography: APAC Europe North America The Research report, Global Automotive Lightweight Materials Market 2016-2020, has been prepared based on an in-depth market analysis with inputs from industry experts. The report covers the market landscape and its growth prospects over the coming years. The report also includes a discussion of the key vendors operating in this market. Key vendors Alcoa ArcelorMittal BASF Toray Industries US Magnesium Other prominent vendors Akzo Nobel Aleris AMG Advanced Metallurgical Group Borealis Constellium Covestro Dead Sea Magnesium Dow Chemical Henkel Johnson Controls KOBELCO LyondellBasell Industries Magna International Norsk Hydro Novelis Owens Corning POSCO PPG SABIC Teijin ThyssenKrupp UACJ Biosensors International Market driver Increase in automotive regulatory requirements For a full, detailed list, view our report Market challenge Fluctuating raw material prices and high cost of automotive lightweight materials For a full, detailed list, view our report Market trend Innovation and focus on use of lightweight materials in new energy vehicles For a full, detailed list, view our report Key questions answered in this report What will the market size be in 2020 and what will the growth rate be? What are the key market trends? What is driving this market? What are the challenges to market growth? Who are the key vendors in this market space? What are the market opportunities and threats faced by the key vendors? What are the strengths and weaknesses of the key vendors? To receive personalized assistance write to us @ [email protected] with the report title in the subject line along with your questions or call us at +1 866-764-2150

Morfin O.A.,UACJ | Loukianov A.G.,CINVESTAV | Canedo J.M.,CINVESTAV | Castellanos M.I.,UACJ
Program and Abstract Book - 2010 7th International Conference on Electrical Engineering, Computing Science and Automatic Control, CCE 2010 | Year: 2010

In ths paper, a robust non-linear controller based on block control linearization combined with a second order sliding modes technique called super-twisting algorithm is proposed for controlling a wind power system. The control objectives consist on maximize the wind energy capture by the turbine and keep the stator power factor of a wound rotor induction generator in a set point value. The goal is achieved by controlling the rotor velocity and stator reactive power of the induction generator which is connected to an infinity bus and coupled with a wind turbine across a gear box. The performance of the designed controller is validated through simulations. © 2010 IEEE.

Becerra M.B.,CIATEC | Zitzumbo R.,CIATEC | Dominguez J.,CIMAT | Garcia J.L.,UACJ | And 2 more authors.
South African Journal of Industrial Engineering | Year: 2014

This paper presents the development of an eco-efficient product/process, which has improved mechanical properties from the introduction of natural fibres in the EPDM (Ethylene-Propylene-Diene-Terpolymer) rubber formulation. The optimisation analysis is made by a fractional factorial design 211-7. Different formulations were evaluated using a multi-response desirability function, with the aim of finding efficient levels for the manufacturing time-cycle, improving the mechanical properties of the product, and reducing the raw material costs. The development of an eco-efficient product/process generates a sustainable alternative to conventional manufacturing. © 2014 South African Institute of Industrial Engineering. All rights reserved.

Perez-Rodriguez R.,CIATEC | Jons S.,University of Guanajuato | Hernandez-Aguirre A.,CIMAT | Alberto-Ochoa C.,UACJ
International Journal of Advanced Manufacturing Technology | Year: 2014

The flexible jobshop scheduling problem permits the operation of each job to be processed by more than one machine. The idea is to assign the processing sequence of operations on the machines and the assignment of operations on machines such that the systemobjectives can be optimized. The assignment mentioned is a difficult task to implement on real manufacturing environments because there are many assumptions to satisfy, especially when the amount of work is not constant or sufficient to keep the manufacturing process busy for a long time, causing intermittent idle times. An estimation of distribution algorithm-based approach coupled with a simulationmodel is developed to solve the problemand implement the solution. Using the proposed approach, the shop performance can be noticeably improved when different machines are assigned to different schedules. © Springer-Verlag London 2014.

Vazquez K.,UACJ | Cota J.,UACJ | Sifuentes E.,UACJ | Gonzalez R.,UACJ
IEEE Latin America Transactions | Year: 2016

A shielded PVDF Film sensor has been used to obtain the Phonocardiogram (PCG) with high Signal-to-Noise Ratio (SNR). A very simple circuit is good enough to detect the first (S1) and the second (S2) sound of the PCG without using any digital signal processing technique. The mechanical coupling between the sensor and the subject determines the kind of signal detected. The sensor has been mounted on the membrane of a mechanical stethoscope in order to simplify the location of the best auscultation area on the chest. If the sensing area of the PVDF Film is in direct contact with the membrane (or the skin), the sensor detects the mechanical displacements of the heart contractions and respiration, so the PCG could not be detected. The best option to detect the S1 and the S2 is to leave an air gap between the sensor and the membrane. Despite using a shielded sensor, it is also necessary to shield electrically the circuit to reduce power line interference, which could not be filtered because it is in the frequency range of S1 and S2. The PCG and the lead II ECG have been measured on ten volunteers. Bland-Altman plots compares the time interval (beat-to-beat) between the peaks of the S1 and S2 with the RR interval of the ECG. The mean bias obtained is not greater than 0.75 ms, which is negligible. With the SNR obtained (> 55 dB), it is possible to detect some valves diseases using a real-time comparison between the PCG and the ECG. © 2016 IEEE.

Maynez L.O.,UACJ | De Jesus Ochoa Dominguez H.,UACJ | Vergara Villegas O.O.,UACJ
IEEE Nuclear Science Symposium Conference Record | Year: 2013

The measurements obtained from the acquiring PET system tend to be very noisy, since randoms and scatter contamination events as well as detector efficiency are strong sources of noise. In particular, for the small animal reconstructed images, this problem becomes severe corrupting areas of interest between organs, making the identification process even more difficult. For that reason, a regularization step is of crucial importance. In this paper, performance evaluations for two different strategies to include wavelet-based regularization within the list-mode Maximum Likelihood Expectation-Maximization (MLEM) reconstruction process are established. Results are compared against the standard noise reduction PSF methods (Gaussian smoothing) used for resolution recovery. For each reconstruction model proposed, investigations on the effects of image quality were addressed. Results show that reconstruction process given by the Model 2, significantly improves the quantity accuracy of the images, especially incrementing the image contrast values in comparison with the standard noise reduction method, which tends to blur the image data. Reconstruction models were tested using list-mode measured data from the high-resolution quad-HIDAC small animal PET scanner. © 2013 IEEE.

Heredia A.,UPAEP | Ambrosio R.,UACJ | Moreno M.,National Institute of Astrophysics, Optics and Electronics | Zuniga C.,National Institute of Astrophysics, Optics and Electronics | And 3 more authors.
Journal of Non-Crystalline Solids | Year: 2012

In this work is presented the fabrication of a thin film membrane as a bio-transducer for aural assistance detection, therefore it will operate at low pressure. The resonant membrane was deposited by PECVD technique at low temperature of deposition T = 270 °C, using SiH 4, GeH 4, and Boron gases. The membrane was suspended on a micromachined crystalline silicon frame obtained by wet chemical etching. The a-SiGe:B film presented a resistivity of 2.46 × 10 3 (Ω-cm), resistance of 20.8 kΩ. Using these experimental data we succeeded in designing a simple structure for sensing low pressure variations. The output voltage of the sensor was measured for a range of pressure from 0 to 3000 Pa and at bias voltage of 10 V. © 2012 Elsevier B.V. All rights reserved.

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