PROPUESTA PERCIBIENDO BRAILLE Y LA FLUIDEZ LECTORA EN ADULTOS CON CEGUERA

Las personas adultas con ceguera adquirida para rehabilitarse optan por aprender el Sistema Braille, logran escribirlo y sin embargo evidencian significativa dificultad para leerlo, ante la circunstancia descrita la presente investigación tuvo como objetivo proponer el Programa Percibiendo Braille para mejorar la fluidez lectora en adultos con ceguera. Investigación enmarcada en el enfoque cuantitativo, con un diseño no experimental, de tipo proyecto factible, con un nivel descriptivo. La muestra estuvo constituida por 10 personas adultas con ceguera adquirida en el transcurso del ciclo de vida. La técnica de recolección de datos fue la observación directa y sus instrumentos el video y la lista de cotejo de la Escala de Fluidez Lectora en español. Los resultados obtenidos indican que el nivel de fluidez lectora, así como las dimensiones velocidad y prosodia se encuentran en un nivel inadecuado. Sin embargo, la dimensión precisión tiene un nivel bueno, ya que el lector despliega gran atención para reconocer palabras, esta conducta se manifiesta, por lo general, en lectores poco fluidos. Entre las conclusiones, se logró realizar la propuesta del Programa Percibiendo Braille para promover mejoras en la fluidez lectora de adultos con ceguera.

Effects of Bonding Treatment and Ball Milling on W-20 wt.% Cu Composite Powder for Injection Molding

W-20 wt.% Cu pseudo-alloys were produced via powder injection molding (PIM) with powders prepared thermochemically. Bonding treatment and ball milling (BTBM) were used, and the effects of BTBM on the characteristics of the powders, rheological properties of the feedstock, shrinkage and properties of the sintered samples were studied. The morphology of the powder changed from extremely agglomerated small particles to pebble-shaped smooth large particles which were composed of several small particles combined tightly. The tap density increased from 3.25 g/cm3 to 7.22 g/cm3, and the specific surface area decreased from 0.86 m2/g to 0.45 m2/g. The critical powder loading of the feedstock increased from 45 vol.% to 56 vol.% due to the change in powder characteristics, thereby improving densification and dimension precision. For the PIM samples sintered at 1290 °C for 120 min in a hydrogen gas, the oversizing factor decreased from 1.297 to 1.216, and the dimension fluctuation ratio decreased from ±0.61% to ±0.33%. At the same time, the relative density increased from 97.8% to 98.6%, the thermal conductivity increased from 218 W/(m·K) to 233 W/(m·K), and the average coefficients of thermal expansion were roughly similar, within the range of 8.43–8.52 × 10−6/K.

Analysis of sealing performance of a kind of profiled rubber gasket used in the radial contact seal structure

Sealing performance of standard rubber gaskets in the radial contact seal structure are observed through the experiment. A kind of profiled rubber gasket is proposed to replace the standard gasket. Leakage experiment and numerical simulation are carried out to study the sealing performance and failure mode of the profiled gasket. Several equations are presented to help analyze the failure reason. Results show that sealing performance of the profiled rubber gasket is more reliable than that of the standard rubber gasket. The failure reason of the profiled rubber gasket is that the friction force between the gasket external face and tube wall cannot balance the tube internal pressure. Dimension precision of the metal compressive ring has a great effect on the failure pressure.

Prediction of Machining Dimension in Laser Heating and Ultrasonic Vibration Composite Assisted Cutting of Tungsten Carbide

Dimension precision plays an important role in precision machining. The two-dimensional ultrasonic vibration cutting (TDUVC) method reduces cutting force and alleviates tool wear, meanwhile, laser assisted cutting (LAC) improves the material workability under high temperature. In this paper, laser heating and two-dimensional ultrasonic vibration were combined in cutting of tungsten carbide (YG10) to improve machining dimension precision. According to the experimental results, a prediction model of machining dimension was built based on time series model. The results show that the machining dimension precision is improved significantly in laser and ultrasonic composite assisted cutting (LUAC), and AR (2) and AR (12) of time series model predicts machining dimension with high precision (the relative error is less than 10%), and reflects tool wear state. Moreover, comparison with artificial neural network (ANN) also proves that the time series model is more suitable for the prediction of machining dimensional in LUAC.

Development of Piercing Technology for CVJ Cage with Thick and Uneven Piercing Holes

In this paper, to design the piercing punch for thick and uneven steel in piercing process, FE simulation technique has been proposed to predict the deformation behavior of CVJ cage through the simulation of the piercing process. In this research, an optimizing technique based on artificial neural network has been applied for the thick and uneven steel in piercing processes to construct database of the dimension precision depending on the shape of punch. It is indicated that shape of punch plays a significant role to keep the dimension precision and to increase the tool life in the uneven piercing process.

Repairing system of large-scale spindle based on planetary grinding equipment

The journal and the shaft shoulder of large-scale spindle are usually worn for insufficient lubrication or the entering of dust. Then, the large-scale spindle is necessary to be immediately repaired. Based on the repairing feature of the large-scale spindle and the main problem of the traditional repairing method, a planetary grinding equipment was developed. The working principle and the structure characteristic of the planetary grinding equipment were analysed. Furthermore, the spindle of the large-scale fan rotor was repaired in situ using the planetary grinding equipment. It was found that the repaired spindle has good dimension precision and surface roughness. A feasible technology was provided for the repairing of the large-scale spindle in situ using this machining method.