scholarly journals The beginning of success: Performance trends and cut-off values for junior and the U23 triathlon categories

Author(s):  
Lucas Pinheiro Barbosa ◽  
Caio Victor Sousa ◽  
Samuel da Silva Aguiar ◽  
André Bonadias Gadelha ◽  
Pantelis Theodoros Nikolaidis ◽  
...  
Keyword(s):  
Author(s):  
Daniel Stark ◽  
Stefania Di Gangi ◽  
Caio Victor Sousa ◽  
Pantelis Nikolaidis ◽  
Beat Knechtle

Though there are exhaustive data about participation, performance trends, and sex differences in performance in different running disciplines and races, no study has analyzed these trends in stair climbing and tower running. The aim of the present study was therefore to investigate these trends in tower running. The data, consisting of 28,203 observations from 24,007 climbers between 2014 and 2019, were analyzed. The effects of sex and age, together with the tower characteristics (i.e., stairs and floors), were examined through a multivariable statistical model with random effects on intercept, at climber’s level, accounting for repeated measurements. Men were faster than women in each age group (p < 0.001 for ages ≤69 years, p = 0.003 for ages > 69 years), and the difference in performance stayed around 0.20 km/h, with a minimum of 0.17 at the oldest age. However, women were able to outperform men in specific situations: (i) in smaller buildings (<600 stairs), for ages between 30 and 59 years and >69 years; (ii) in higher buildings (>2200 stairs), for age groups <20 years and 60–69 years; and (iii) in buildings with 1600–2200 stairs, for ages >69 years. In summary, men were faster than women in this specific running discipline; however, women were able to outperform men in very specific situations (i.e., specific age groups and specific numbers of stairs).


Author(s):  
David A. Joyner ◽  
Lily Bernstein ◽  
Maria-Isabelle Dittamo ◽  
Ben Engelman ◽  
Alysha Naran ◽  
...  

Author(s):  
Mukarrum Raheel ◽  
Abraham Engeda

Regenerative flow compressors and pumps, hereafter called RFC/RFP have found many applications in industry; still they are the most neglected turbomachines in the family of dynamic compressors. The number of publications existing in literature is very small compared to the large number of papers about the centrifugal and axial turbocompressors. This paper gives a detail discussion of fundamentals and working principle of regenerative turbomachines. Regenerative compressors are compared with centrifugal compressors and the importance of regenerative turbomachines in low specific speed range is emphasized. The major findings of available literature on regenerative turbomachine are summarized. The current status, limitations and some of the challenges faced by RFC/RFP are assessed in context of performance improvement. The paper concludes with an overview of ongoing research and future directions to be followed for performance improvement of this neglected class of turbomachines.


1996 ◽  
Vol 44 (10) ◽  
pp. 1226-1231 ◽  
Author(s):  
Miriam C. Morey ◽  
Carl F. Pieper ◽  
Robert J Sullivan ◽  
Gail M. Crowley ◽  
Patricia A. Cowper ◽  
...  

Author(s):  
K. Eftekhari Shahroudi

Despite their seemingly impressive claims, current products for Condition Monitoring, Diagnostic and Decision Support Systems (CMD&D) do not provide the reliable bottom line information that end users and operators need. Instead they confuse the issue with gigabytes of logged trends, complex cause-effect matrices, fault signatures etc. The term “Intelligent Health Control” here refers to the next generation of such systems which provide usable information on: • the existence and severity of faults; • how their severity will progress with utilization; • how this progress can be influenced or controlled. In this paper the fundamental shortcomings of current approaches are discussed prior to introducing the basics of Intelligent Health Control in terms of fault models and how they can be used to close the diagnostic, prognostic and intelligent control triangle. The industry will unavoidably shift towards an “information centric” view from the currently predominant “data centric” view. Gigabytes of performance trends will no longer be relevant. Instead, reliable bottom line information will be required on how to minimize or control the costs associated with machinery health degradation or faults. In order to keep the discussion real, the current state of the art of enabling technologies are discussed, including: • Open Information Buses; • Adding real time data server functionality to the control system; • Computational Steering, Human-in-the-Loop Optimization (or semi-automatic problem solving); • Fault Models; • Faster than real time simulation; • Neural Nets.


2009 ◽  
Vol 18 (6) ◽  
pp. 449-467 ◽  
Author(s):  
Joel C Huegel ◽  
Ozkan Celik ◽  
Ali Israr ◽  
Marcia K O'Malley

This paper introduces and validates quantitative performance measures for a rhythmic target-hitting task. These performance measures are derived from a detailed analysis of human performance during a month-long training experiment where participants learned to operate a 2-DOF haptic interface in a virtual environment to execute a manual control task. The motivation for the analysis presented in this paper is to determine measures of participant performance that capture the key skills of the task. This analysis of performance indicates that two quantitative measures—trajectory error and input frequency—capture the key skills of the target-hitting task, as the results show a strong correlation between the performance measures and the task objective of maximizing target hits. The performance trends were further explored by grouping the participants based on expertise and examining trends during training in terms of these measures. In future work, these measures will be used as inputs to a haptic guidance scheme that adjusts its control gains based on a real-time assessment of human performance of the task. Such guidance schemes will be incorporated into virtual training environments for humans to develop manual skills for domains such as surgery, physical therapy, and sports.


Author(s):  
Ahmed Abdelwahab

The desire to achieve high discharge pressures at low manufacturing and maintenance costs has resulted in the development of a number of new positive displacement rotary compressor designs. The proposed design involves a compressor with a trochoidal casing geometry and a rotor orbiting the casing interior. This arrangement generates a varying trapped volume between the rotor and the casing thus providing the necessary compression for the compressor. The major advantage of this design is its inherent simple two-dimensional configuration which makes it a very cheap device to manufacture. Furthermore, the oil-flooded lubrication system used with this design not only acts as a lubricant but also as a coolant to the main gas flow and consequently improves the mechanical reliability of the compressor. This paper presents a complete design model developed to investigate the performance of the compressor. The geometrical, kinematic, and dynamic equations of the casing and rotor are derived. A model of the compressor thermodynamic cycle and gasdynamic performance is presented. A comparison between the developed model and the experimental results of a prototype compressor testing is presented. The comparison shows that the developed model indeed captures the compressor performance trends with considerable accuracy at the design conditions. Deviation between the model and experimental results at the off design conditions is due to inaccuracies in the inlet and exit port loss models at the off design conditions.


2020 ◽  
Vol 10 (1) ◽  
pp. 161-172
Author(s):  
Marcia Jane Ganasan ◽  
Nordin Abd. Razak ◽  
Marlina Jamal

Reading literacy is often understood as a basic skill, and it is gaining recognition as the most functional means to educational attainment and individual development. It not only sets a benchmark but also reveals students’ strengths and weaknesses through performance measurement. This paper attempts to investigate sixteen-year-olds’ reading literacy proficiency using a performance band system in reporting their ‘can’s and ‘cant’s in reading. It drew insights from the Text-Task Respondent Theory of Functional Literacy (White, 2011) and the Revised Bloom’s Taxonomy (Anderson Krathwohl, 2001), where pertinent concepts were drawn to address students’ functional abilities. The study involved a total of 813 sixteen-year-old students representing the northern, southern, central, and east coast regions of Peninsular Malaysia (Penang, Perak, Perlis, Selangor, Kedah, Kelantan, Terengganu, and Johor). A survey research method was employed to capture cognitive competencies that denoted students’ functional abilities when it came to reading literacy. The study measured the students’ reading literacy attainment based on a proficiency scale spanning on five-band levels. The findings of the present study revealed that the majority of the students attained Band 3, where they demonstrated a moderate understanding of texts and were able to integrate some part of texts to infer meaning. The study provides valuable insights to policymakers, educationists, employers in making data-driven decisions to improve educational outcomes. It also attempts to shed some light on the current pedagogical trends and provide suggestive practices in reading.


2016 ◽  
Vol 14 (1) ◽  
pp. 40-50 ◽  
Author(s):  
Veronika Bikse ◽  
Baiba Rivza ◽  
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Inese Lusena - Ezera ◽  
...  

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