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Search Results (3)

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Keywords = PALT

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11 pages, 2148 KiB  
Article
Strategic Approaches for Assessing the Reliability Information during Product Development: Perspective of the Partially Accelerated Degradation Test
by Si-Il Sung
Appl. Sci. 2023, 13(9), 5448; https://doi.org/10.3390/app13095448 - 27 Apr 2023
Cited by 3 | Viewed by 1235
Abstract
In this paper, a strategic approach is provided for simultaneously assessing the verification and validation (V&V) test results and the reliability information during product development based on the perspective of the partially accelerated degradation test (PADT) scheme. This approach addresses the obstacle of [...] Read more.
In this paper, a strategic approach is provided for simultaneously assessing the verification and validation (V&V) test results and the reliability information during product development based on the perspective of the partially accelerated degradation test (PADT) scheme. This approach addresses the obstacle of obtaining prior information on the model parameters for conducting PADT while minimizing the asymptotic variance of the acceleration model parameters. The strategic advantages and characteristics of the PADT, which do not exist in the classical accelerated test (AT) and partially accelerated test (PAT), are presented. In addition, the advantages and suitability of adopting the PADT instead of the partially accelerated life test (PALT) for effectively assessing the reliability information during product development are investigated through illustrative examples. Full article
(This article belongs to the Section Applied Industrial Technologies)
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11 pages, 317 KiB  
Article
Analysis of Academic Psychological Variables, Physical Education, and Physical Activity Levels of Mexican Students
by Raúl Baños, Roberto Espinoza-Gutiérrez, Juan José Calleja-Núñez and Gloria Rodríguez-Cifuentes
Behav. Sci. 2023, 13(3), 271; https://doi.org/10.3390/bs13030271 - 20 Mar 2023
Cited by 2 | Viewed by 2220
Abstract
Physical inactivity is a current worldwide, and especially Mexican adolescents. Therefore, this study has the following objectives: (i) to analyze the PA-LT pattern of Mexican adolescents; (ii) to analyze whether there are differences in emotional intelligence, basic psychological needs, academic motivation, self-esteem, and [...] Read more.
Physical inactivity is a current worldwide, and especially Mexican adolescents. Therefore, this study has the following objectives: (i) to analyze the PA-LT pattern of Mexican adolescents; (ii) to analyze whether there are differences in emotional intelligence, basic psychological needs, academic motivation, self-esteem, and academic satisfaction according to the PA-LT pattern; (iii) to analyze the relationship between emotional intelligence, basic psychological needs, academic motivation, self-esteem, and academic satisfaction. A total of 748 secondary school students participated, of which 374 were girls (Mean age = 13.99; SD = 0.30) and 374 boys (Mean age = 14.02; SD = 0.33). The questionnaire comprised the following scales: IE, NPB-ESC, EMA, EA, and SIE. The main results obtained show that none of the girls stick to any active physical activity pattern during their spare time. In addition, physically active boys obtained better scores in emotional clarity, emotional repair, perception of academic competence, perception of social relationships, extrinsic motivation, intrinsic motivation, self-esteem, and satisfaction with school. Full article
(This article belongs to the Special Issue Physical Activity and Health: Social Psychology Perspective)
15 pages, 8648 KiB  
Article
Analysis on the Isostatic Bipod Mounts for the HERA Mission LIDAR
by Nicole G. Dias, Paulo Gordo, Hugo Onderwater, Rui Melicio and António Amorim
Appl. Sci. 2022, 12(7), 3497; https://doi.org/10.3390/app12073497 - 30 Mar 2022
Cited by 9 | Viewed by 3978
Abstract
The Light Detection and Ranging (LIDAR) is a time-of-flight altimeter instrument being developed for the HERA mission, designated as Planetary ALTimeter (PALT). PALT is positioned in the center of the top face of the HERA probe, and therefore, it cannot use radiators to [...] Read more.
The Light Detection and Ranging (LIDAR) is a time-of-flight altimeter instrument being developed for the HERA mission, designated as Planetary ALTimeter (PALT). PALT is positioned in the center of the top face of the HERA probe, and therefore, it cannot use radiators to stabilize its internal temperature. The contribution of this paper is the design of isostatic bipod mounts for the LIDAR primary mirror. The performance of PALT must be maintained over a wide operational range, from −60 °C to 80 °C. These temperature requirements imply that a careful isostatic mount structure design is critical to maintaining performance in all operational scenarios. The purpose of the instrument is to perform range measurements from 500 m to 14 km. The instrument will contribute to the detailed characterization of the asteroid’s topography, assist the probe navigation in operations such as fly-bys (including on the dark side of the asteroid) or landing. PALT has an emitter system that generates 2 ns, 100 µJ, 1535 nm laser pulses and a receiver system that collects the backscattered signal from the asteroid. The receiver system is composed of a 70 mm diameter Cassegrain telescope and a refractive system that focuses the signal on the sensor. Full article
(This article belongs to the Special Issue Small Satellites Missions and Applications)
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