Double-tailored dual-mirror nonimaging concentrators for maximum-performance solar concentration

2010 ◽  
Author(s):  
Alex Goldstein ◽  
Jeffrey M. Gordon
Keyword(s):  
Maximum Performance

Der Einfluss familialer Merkmale auf den Entwicklungsprozess vom Fussballtalent zum Spitzenspieler

2015 ◽  
Vol 63 (1) ◽  
Keyword(s):  
Childhood And Adolescence ◽  
Research Project ◽  
Maximum Performance ◽  
Adult Level ◽  
Strong Affinity ◽  
Youth Football ◽  
Football Team ◽  
The Family ◽  
Exogenous Factors ◽  
Level Performance

The process by which young talents develop to become top-class players once they reach the age of maximum performance is influenced by numerous factors. Among the exogenous factors, the family plays a central role. In the context of a research project carried out in cooperation with the Swiss Football Association SFV, 159 former members of the national youth football team were interviewed retrospectively, among other things concerning their family circumstances. The study is interested in understanding two issues: 1) It examines which family conditions – compared with average Swiss families – lead to success in adolescence (nomination for a national youth team). 2) Since success in adolescence by no means guarantees top-level performance at the age of maximum performance, the heterogeneity of the sample’s adult level of performance is used to compare players who later achieve greater success to the less successful players. It is found that these players come from families with many chil-dren and a strong affinity to sports. Those players who are particularly successful at the age of maximum performance also felt they received more support from their parents and siblings during childhood and adolescence than the players who went on to be less successful.

scholarly journals Is there a relationship between the overhead press and split jerk maximum performance? Influence of sex

2021 ◽  
pp. 174795412110204
Author(s):  
Marcos A Soriano ◽  
G Gregory Haff ◽  
Paul Comfort ◽  
Francisco J Amaro-Gahete ◽  
Antonio Torres-González ◽  
...  
Keyword(s):  
Confidence Intervals ◽  
Body Mass ◽  
Upper Limb ◽  
High Reliability ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Training Experience ◽  
Maximum Performance ◽  
Repetition Maximum ◽  
Intraclass Correlation Coefficients

The aims of this study were to (I) determine the differences and relationship between the overhead press and split jerk performance in athletes involved in weightlifting training, and (II) explore the magnitude of these differences in one-repetition maximum (1RM) performances between sexes. Sixty-one men (age: 30.4 ± 6.7 years; height: 1.8 ± 0.5 m; body mass 82.5 ± 8.5 kg; weightlifting training experience: 3.7 ± 3.5 yrs) and 21 women (age: 29.5 ± 5.2 yrs; height: 1.7 ± 0.5 m; body mass: 62.6 ± 5.7 kg; weightlifting training experience: 3.0 ± 1.5 yrs) participated. The 1RM performance of the overhead press and split jerk were assessed for all participants, with the overhead press assessed on two occasions to determine between-session reliability. The intraclass correlation coefficients (ICC) and 95% confidence intervals showed a high reliability for the overhead press ICC = 0.98 (0.97 – 0.99). A very strong correlation and significant differences were found between the overhead press and split jerk 1RM performances for all participants (r = 0.90 [0.93 – 0.85], 60.2 ± 18.3 kg, 95.7 ± 29.3 kg, p ≤ 0.001). Men demonstrated stronger correlations between the overhead press and split jerk 1RM performances (r = 0.83 [0.73-0.90], p ≤ 0.001) compared with women (r = 0.56 [0.17-0.80], p = 0.008). These results provide evidence that 1RM performance of the overhead press and split jerk performance are highly related, highlighting the importance of upper-limb strength in the split jerk maximum performance.

scholarly journals Effects of face masks on performance and cardiorespiratory response in well-trained athletes

2021 ◽  
Author(s):  
Florian Egger ◽  
Dominic Blumenauer ◽  
Patrick Fischer ◽  
Andreas Venhorst ◽  
Saarraaken Kulenthiran ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Minute Ventilation ◽  
Anaerobic Exercise ◽  
Peak Oxygen Consumption ◽  
Exercise Tests ◽  
Maximum Performance ◽  
Outdoor Sports ◽  
Cardiorespiratory Response ◽  
Individual Anaerobic Threshold ◽  
The Individual

Abstract Background During the COVID-19 pandemic, compulsory masks became an integral part of outdoor sports such as jogging in crowded areas (e.g. city parks) as well as indoor sports in gyms and sports centers. This study, therefore, aimed to investigate the effects of medical face masks on performance and cardiorespiratory parameters in athletes. Methods In a randomized, cross-over design, 16 well-trained athletes (age 27 ± 7 years, peak oxygen consumption 56.2 ± 5.6 ml kg−1 min−1, maximum performance 5.1 ± 0.5 Watt kg−1) underwent three stepwise incremental exercise tests to exhaustion without mask (NM), with surgical mask (SM) and FFP2 mask (FFP2). Cardiorespiratory and metabolic responses were monitored by spiroergometry and blood lactate (BLa) testing throughout the tests. Results There was a large effect of masks on performance with a significant reduction of maximum performance with SM (355 ± 41 Watt) and FFP2 (364 ± 43 Watt) compared to NM (377 ± 40 Watt), respectively (p < 0.001; ηp2 = 0.50). A large interaction effect with a reduction of both oxygen consumption (p < 0.001; ηp2 = 0.34) and minute ventilation (p < 0.001; ηp2 = 0.39) was observed. At the termination of the test with SM 11 of 16 subjects reported acute dyspnea from the suction of the wet and deformed mask. No difference in performance was observed at the individual anaerobic threshold (p = 0.90). Conclusion Both SM and to a lesser extent FFP2 were associated with reduced maximum performance, minute ventilation, and oxygen consumption. For strenuous anaerobic exercise, an FFP2 mask may be preferred over an SM.

Pumps and gaskets fine-tuned for maximum performance

World Pumps ◽  
2007 ◽  
Vol 2007 (495) ◽  
pp. 24-26
Author(s):  
Heiko Schulz
Keyword(s):  
Maximum Performance

Maximum performance of an active magnetic regenerator

2021 ◽  
Vol 119 (20) ◽  
pp. 203901
Author(s):  
Dimitri Benke ◽  
Maximilian Fries ◽  
Tino Gottschall ◽  
Dominik Ohmer ◽  
Andreas Taubel ◽  
...  
Keyword(s):  
Maximum Performance ◽  
Active Magnetic Regenerator ◽  
Magnetic Regenerator

Evaluation of the maximum performance of block encryption algorithms

2019 ◽  
Vol 10 (2) ◽  
pp. 181-191
Author(s):  
Vladimir Mikhailovich Fomichev ◽  
Alisa Mikhailovna Koreneva ◽  
Al'finur Ruslanovna Miftakhutdinova ◽  
Dmitrii Igorevich Zadorozhny
Keyword(s):  
Maximum Performance ◽  
Encryption Algorithms ◽  
Block Encryption

Исследуется класс нелинейных итеративных преобразований, обобщающих сеть Фейстеля и построенных на основе автономного регистра сдвига длины $n$ с $m$ обратными связями над множеством $32$-мерных двоичных векторов, $32 \geqslant n > m \geqslant 1$. Предложена интегральная характеристика предельной производительности шифрования, которая может применяться при обосновании выбора параметров конкретных блочных алгоритмов.

What Makes You Think You're so Smart?

2008 ◽  
Vol 29 (1) ◽  
pp. 35-44 ◽  
Author(s):  
Beth A. Visser ◽  
Michael C. Ashton ◽  
Philip A. Vernon
Keyword(s):  
Sex Differences ◽  
Multiple Intelligences ◽  
Openness To Experience ◽  
Personality Characteristics ◽  
Performance Tests ◽  
Strong Correlations ◽  
Maximum Performance ◽  
Personality Variables ◽  
Ability Levels

Abstract. This study examined the correlates of self-estimated levels of the eight abilities of Gardner's (1983) “multiple intelligences” framework. Participants (N = 200) estimated their own levels of the eight abilities, completed two maximum performance tests of each ability, and provided self-ratings of their personality characteristics. As observed in previous research, most participants tended to overestimate their levels of ability in most of the intelligence domains. Self-estimated ability levels were generally only modestly correlated with measured levels of the same ability, and tended to show equally strong correlations with personality variables. Sex differences were observed for self-estimates of some abilities, and these sex differences were largely independent of measured ability and personality. It was concluded that high levels of self-estimated ability were related to being male, having high measured ability, and being high in Conscientiousness, Extraversion, and Openness to Experience, and low in Emotionality.

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