scholarly journals Radiation resistance of high frequency ultrasonic devices for distance measurement in the RHF

2020 ◽  
Vol 225 ◽  
pp. 04006
Author(s):  
Meriem Chrifi Alaoui ◽  
Emmanuel Le Clézio, ◽  
Gilles Despaux ◽  
Yoann Calzavara
Keyword(s):  
Fuel Element ◽  
Radiation Resistance ◽  
High Frequency ◽  
Electronic System ◽  
Distance Measurement ◽  
Passive Components ◽  
Research Reactors ◽  
Ultrasonic Devices ◽  
Plate Distance ◽  
Do So

The fuel element plates of research reactors are subjected to swelling phenomena. These structure modifications impact an initial inter-plate distance of 1.8 mm. An ultrasonic device has been developed to investigate this parameter. With a 1 mm thickness, it relies on two transducers linked to an electronic system. The feasibility of the distance measurement has been proved in a previous study and the irradiation impact on the transducer components is here studied. To do so, a radiation resistance experiment was realized in the Arc-Nucleart Institute of Grenoble. It allowed the study of the influence of radiations on the device active and passive components’ characteristics.

scholarly journals Perceived ethical misconduct: a survey of neuropsychology professionals in Mexico

2016 ◽  
Vol 9 (1) ◽  
pp. 64-71 ◽  
Author(s):  
Paola Fonseca ◽  
Laiene Olabarrieta Landa ◽  
Ivan Panyavin ◽  
Xóchitl Angélica Ortiz Jiménez ◽  
Adriana Aguayo Arelis ◽  
...  
Keyword(s):  
Professional Practice ◽  
High Frequency ◽  
Professional Training ◽  
Clinical Care ◽  
Professional Relationships ◽  
Ethical Misconduct ◽  
And Training ◽  
Do So

Objective: To evaluate the frequency of perceived ethical misconduct in the practice of neuropsychology in Mexico. Method: One hundred fourteen psychologists answered a survey which assessed perceptions of ethical misconduct in four areas of professional practice in the field of neuropsychology.Results: The area of professional training contained the highest percentage of perception of ethical misconduct, followed by research and publications, clinical care, and professional relationships. Conclusion: The high frequency of ethical misconduct perceived by neuropsychology professionals in Mexico is a cause for concern. The results suggest the need to create and implement a system to make sure that professionals follow the ethics standards required by the profession, and to provide consequences for those who fail to do so. The profession of neuropsychology and training of professionals in the field must be regularized in the country, to reduce the frequency of future ethical misconducts.

Dynamic Translation of Surface Coarseness Into Whisker Vibrations

2008 ◽  
Vol 100 (5) ◽  
pp. 2852-2865 ◽  
Author(s):  
Eran Lottem ◽  
Rony Azouz
Keyword(s):  
Surface Roughness ◽  
High Frequency ◽  
Radial Distance ◽  
Translation Process ◽  
Tactile Information ◽  
Large Variability ◽  
Vibration Signals ◽  
Texture Discrimination ◽  
Linear Discriminant ◽  
Do So

Rodents in their natural environment use their whiskers to distinguish between surfaces having subtly different textures and shapes. They do so by actively sweeping their whiskers across surfaces in a rhythmic motion. To determine how textures are transformed into vibration signals in whiskers and how these vibrations are expressed in neuronal discharges, we induced active whisking in anesthetized rats, monitored the movement of whiskers across surfaces, and concurrently recorded from trigeminal ganglion (TG) neurons. We show that tactile information is transmitted through high-frequency micromotions superimposed on whisking macro motions. Consistent with this, we find that in most TG neurons, spike activity, and high-frequency micromotions are closely correlated. To determine whether these vibration signals can support texture discrimination, we examined their dependence on surface roughness and found that both vibration signals carry information about surface coarseness. Despite a large variability in this translation process, different textures are translated into distinct vibrations profiles. These profiles depend on whiskers properties, on radial distance to the surface, and on whisking frequency. Using the characteristics of these signals, we employ linear discriminant analysis and found that all whiskers were able to discriminate between different textures. While deteriorating with radial distance, this classification did not depend on whisking frequency. Finally, increasing the number of whisks and integrating tactile information from multiple whiskers improved texture discrimination. These results indicate that surface roughness is translated into distinct whisker vibration signals that result in neuronal discharges. However, due to the dynamic nature of this translation process, we propose that texture discrimination may require the integration of signals from multiple spatial and temporal sensory channels to disambiguate surface roughness.

Modeling of high frequency MMIC passive components

2003 ◽  
Author(s):  
A. Nakatani ◽  
S.A. Maas ◽  
J. Castaneda
Keyword(s):  
High Frequency ◽  
Passive Components

Young Children's Meaning in Life

1993 ◽  
Vol 73 (3_suppl) ◽  
pp. 1099-1104 ◽  
Author(s):  
Shelby J. Taylor ◽  
Peter Ebersole
Keyword(s):  
High Frequency ◽  
Meaning In Life ◽  
First Graders ◽  
Modern Society ◽  
Large Percentage ◽  
Personal Meaning ◽  
Young Adolescents ◽  
Do So

A decade ago DeVogler and Ebersole reported that young adolescents were able to express the fact that they had personal meaning in their lives. In the present study we found that even younger children (26 first graders) could do so also when personal meaning was defined to them as that which in their whole life is most important to them. The high frequency of those reporting a personal meaning goes against the position that a large percentage of individuals in our modern society lack personal meaning.

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