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This work reports the recent advances on the synthesis and characterization of thin Cu2ZnSnS4 (CZTS) films prepared by chemical solution deposition. CZTS colloids dispersed in water-ethanol solutions were used as precursors and prepared by coprecipitation by mixing CuCl2-2H2O, ZnCl2, SnCl2 and thiourea (NH2)2CS in water-ethanol mixtures. The CZTS films were deposited on glass substrates by spin-coating...
In this paper, we present a tracking system to estimate the position of a surgical instrument used in minimally invasive spine surgeries for training. The purpose of our system is to get the information about movements and surgeons skills during the training. The system uses four infrared markers embedded on the surgical instrument of common used. At least two Wii Remote Control is needed for calculating...
In the present work, graphene oxide (GO) is synthesized from the Modified-Hummers method, varying the type of solvent and the number of washes involved in obtaining the GO, also evaluating the effect of the solvent on the morphological and structural properties. X-ray diffraction confirms the increase of the interplanar distance (3.15–7.8 Å) with respect to the graphite peak (002), which corroborates...
Morphological computation (MC) has revolutionized robotic systems employing morphological properties (MP). Thus far, morphology has been mostly used to analyze morphological functionalities qualitatively after design phase of robotic systems. Furthermore, morphology has verified qualitative requirements, not modeled quantitative specifications. To fill this gap, we present a distributed algorithm...
Proportional-integral-derivative (PID) controller is popular algorithm in structure vibration control. In order to maintain minimum regulation error, the PID control require big proportional and derivative gains. The control performances are not satisfied because of the big uncertainties in the buildings. In this paper, the type-2 fuzzy system is applied to compensate the unknown uncertainties, and...
This paper presents a study of the impact of image preprocessing techniques on the segmentation and classification of breast lesions on ultrasound. Commonly, image preprocessing performs contrast enhancement and speckle reduction. In this sense, five contrast enhancement techniques and four despeckling methods were combined to generate 20 different image preprocessing schemes. The experiments considered...
The present work proposes a neurofeedback training system for the induction of an attention state aided by audiovisual stimuli on an experimental group of nine junior high school individuals between twelve and fifteen years old. A control group of 10 individuals with the same characteristics as the experimental group is defined as well to validate the training's efficiency. The auditory stimulation...
The MEMS (Micro-Electro-Mechanical Systems) acronym recalls mechanical structures of micrometric dimensions performing a well-controlled electronically preset function. The real sense of a microelectromechanical system (MEMS) is the interaction of electronic circuits with the mechanical transducers (microstructures) to perform a useful function. However, the MEMS-microstructures require a wide range...
Cu-doped zinc oxide (ZnO:Cu) powders were synthesized by the co-precipitation technique, by using different doping concentrations (1, 3 and, 5 at %). The structural properties of the powders were analyzed by X-ray diffraction (XRD), the morphology was investigated by scanning electron microscopy (SEM). Cu-doped ZnO and ZnO undoped pellets were manufactured with a pressing machine, using a pressure...
Development of suitable electrochemical transducers (e.g. electrodes) is a major concern to obtain efficient sensing and biosensing platforms. Graphene has attracted attention as a potential material for electrochemical transduction, but its massive production remains as a challenge. In this work, the development and characterization of graphene electrodes based on thermal reduction by laser action...
Apiculture has been a method for harvesting honey and helping crop proliferation, nonetheless late climate changes have affected bee population. Having an automated hive as a tool for beekeepers would help to increase and protect current bee population guaranteeing crop proliferation needed for human consumption. In this paper, we propose an electronic beehive that recollect honey automatically, regulate...
The blood brain barrier (BBB) is a specialized membrane that covers the blood vessel in the central nervous system. This structure regulates the passage of certain substances for keeping the homeostasis into the brain. But this selective permeability is a drawback in treatments for neurodegenerative diseases, because the BBB prevents the passage of drugs to the affected brain cells. The use of focused...
Two suitable coordinate systems overlapping at the origin were established to estimate orientation by computing the spatial relationship between them. An Inertial Measurement Unit sensor (IMU), consisting of a tri-axial gyroscope and tri-axial accelerometer was used to define reference systems. This work describes an algorithm to estimate the orientation of an object in 3D space through the optimal...
This paper shows the design of a 2-DOF exoskeleton simulating ball and socket joint, for use on the human shoulder. This design is based on the natural movement of the human shoulder wich has a ball and socket joint. In addition, will be a dynamic and control analysis.
This work proposes a biometrie identification system based on electrocardiographic signal, for online applications. To acquire the signal, the NI MyDAQ and the AD8232 Heart Rate Monitor module were used. Once the signal was digitized, filtering was applied and algorithms to process the signal were designed to detect the fiducial markers of the signal, such as the R peak, the Q wave, the ending of...
In this work, a comparative study for the n-type emitter formation in the fabrication of simple structures of crystalline silicon (c-Si) solar cells is reported. Gas and spin on dopant sources were employed in the pn junction formation of the solar cells in order to compare their performance. Phosphine (PH3) was used as n-type gas for phosphorus diffusion while the Filmtronics Spin-On Dopant SOD-P905...
While efficient simulators for Time-Multiplexing Cellular Neural Networks have been reported, no reports on implementations in FPGA have been presented. A Time-Multiplexing Cellular Neural Network is implemented within a FPGA for image processing. The network has been used to perform tasks, such as edge detection and noise remover over several test templates. Implementation results are compared with...
In this paper, the effects of geometrical discontinuities and topological structure on Rotary Travelling Wave Oscillators (RTWO) are studied. Using the 3D electromagnetic simulator EMPro Simulation Software Design Platform, we have found that reducing the corner discontinuities can increase the oscillation frequency up to 3.34%. Additionally, we observed that the topological structure of the RTWO...
Jitter is inherent to the breakpoints of measured genome somatic copy number alterations (SCNAs). Therefore, an analysis of jitter is required to reduce errors in the SCNA estimation. The high resolution technologies of hybridization are used to detect SCNAs. However, the SCNA measurements are accompanied with intensive noise that may cause errors and ambiguities in the breakpoint detection with low...
In this work, a simple electric circuit model for the evaluation of the impact of vias (inter-metallic vertical connections) in resonant rotary traveling wave oscillator (RTWO) is proposed. A test structure was designed to quantify the degradation on the signal integrity of RTWOs caused by these vias. The test structure and the RTWO were designed according to the rules of the 130 nm commercial mixed...
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