scholarly journals Lubrication system of a roller cone bit

2020 ◽  
Vol 329 ◽  
pp. 03006
Author(s):  
Denis Simisinov ◽  
Anatoly Afanas’ev ◽  
Vitaliy Adas ◽  
Anton Simisinov
Keyword(s):  
Air Pressure ◽  
Maximum Depth ◽  
Lubrication System ◽  
Plunger Pump ◽  
Bit Life ◽  
The Relationship ◽  
A Performance

For drilling roller bits that work with face purging, a device for a circulating lubrication system is proposed through the use of a plunger pump. A constant circulation of the lubricant is realized with a performance proportional to the speed of the bit. The relationship between the parameters of the lubrication system and the purge air pressure with the maximum depth of the well is established. The obtained equations allow us to determine the parameters of the bit journal lubrication system and exclude the penetration of drilling products into the bearing cavity, which will increase the bit life.

scholarly journals "The show must go on!" Beserings van dramastudente tydens opleiding

2017 ◽  
Vol 12 (1) ◽  
pp. 137
Author(s):  
Rika Snyman ◽  
Jaco Deacon
Keyword(s):  
Working Conditions ◽  
Working Hours ◽  
Practical Training ◽  
The University ◽  
The Relationship ◽  
A Performance

This article also tries to compare the situation of a student sports person injured while participating in university sports, and a drama student injured during a performance or rehearsal of a play. It is stated that the relationship between the drama student and lecturer is similar to the relationship between a sports person and his/her coach, but the relationship differs in that a sports person’s risk of getting hurt is much greater than that of a drama student, The contracts between sports players and their authorities are also stipulated in much more detail than the contracts (if any) between the drama students and the university. It is concluded that the legislation is not clear on the specific matters where a student undergoes practical training while they are still studying. The suggestion is that a sectoral determination must be put in place to regulate the relationship, the remuneration, the working hours and the working conditions and risks involved.

Relation of Motivational Climate and Fear of Failure in Taiwanese Adolescent Athletes

2009 ◽  
Vol 104 (2) ◽  
pp. 627-632 ◽  
Author(s):  
Ying-Mei Tsai ◽  
Lung Hung Chen
Keyword(s):  
Motivational Climate ◽  
Fear Of Failure ◽  
Adolescent Athletes ◽  
Perceived Motivational Climate ◽  
The Relationship ◽  
A Performance

In this study, the relationship between motivational climate and fear of failure in sport was examined. 176 adolescent athletes were recruited ( M=16.3 yr., SD =13). Athletes completed the Chinese Perceived Motivational Climate in Sport Questionnaire and the Performance Failure Appraisal Inventory. Results indicated a performance climate was positively related to the fear of failure, while a mastery climate was not.

Un altro ordine del tempo

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Riccardo Fazi
Keyword(s):  
Performing Arts ◽  
Social Perspective ◽  
European Context ◽  
Analysis Tools ◽  
Artistic Works ◽  
The Relationship ◽  
Different Order ◽  
Actual Point ◽  
A Performance

During the last decade there has been a radical rethink, in the European context of both theatre and performing arts, on how a performance or a spectacle is narrated and enjoyed. Artists like Milo Rau, Tino Sehgal, Marten Spangberg, Rabih Mrouè, Amir Reza Koohestani, and Richard Maxwell structure their practices on a reflection about the concept of time and on how it can be returned on stage. A different order of time is the second chapter of a three-parts essay focused on the analysis of the artists' works; the essay aims to create a dialogue between the artistic works and the actual point of the debate about time through a philosophical, scientific and social perspective. How does performing arts design the relationship between time and our evolution as individuals today? In which manner the collective tale configures itself through this artistic, utopian narrative? And what about the analysis tools we might need to effectively enjoy these works?

Clothing Matter: Thomas Carlyle’s Sartor Resartus

2018 ◽  
pp. 259-271
Author(s):  
Philipp Erchinger
Keyword(s):  
Scientific Knowledge ◽  
Ways Of Knowing ◽  
Literary Work ◽  
Material World ◽  
Personal Experiences ◽  
Building Activities ◽  
Bridge Building ◽  
The Relationship ◽  
A Performance

The book concludes with a reading of Thomas Carlyle’s Sartor Resartus. For this work can be characterised, the chapter suggests, as a performance of, and meditation on, what the foregoing sections were meant to examine: namely the bridge-building activities or ways of knowing through which personal experiences of the material world come to be dressed in recognisable social or ideal forms. The chapter ends with an attempt to situate the practice-based approach developed in Artful Experiments within a wider theoretical debate about the relationship between literary work and scientific knowledge.

scholarly journals The clinical effect of smoking and environmental factors in spontaneous pneumothorax: a case-crossover study in an Inland province

2020 ◽  
Vol 14 ◽  
pp. 175346662097740
Author(s):  
Dohun Kim ◽  
Sang-Yong Eom ◽  
Chang-Seob Shin ◽  
Yong-Dae Kim ◽  
Si-Wook Kim ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Relative Humidity ◽  
Air Pollutants ◽  
Spontaneous Pneumothorax ◽  
Conditional Logistic Regression ◽  
Air Pressure ◽  
Case Crossover ◽  
Matched Data ◽  
Stratified Analysis ◽  
The Relationship

Background: The factors that trigger spontaneous pneumothorax have not been sufficiently evaluated. The purpose of this study is to analyze the relationship between the development of spontaneous pneumothorax and meteorological parameters, including air pollutants. Methods: This is a retrospective study using the medical records of 379 patients who were admitted for spontaneous pneumothorax (SP) over a period of 4 years. Meteorological and air pollution data were obtained from the National Meteorological Office and the Ministry of Environment. We employed a case-crossover design to evaluate the short-term association between SP and meteorological factors including air pollutants. Conditional logistic regression was used to analyze bi-directional matched data. Results: Increase of relative humidity (RH) and of carbon monoxide (CO) were associated with the risk of pneumothorax, with odds ratio (OR) for RH = 1.18 (1.02–1.36), CO = 1.23 (1.02–1.48). Moreover, as air pressure (AP) decreased, risk of pneumothorax increased, with OR = 1.30 (1.05–1.59) but others did not. In the stratified analysis, the effect of RH was positive in ex-smokers (OR = 3.31) and non-smokers (OR = 1.32), but negative in current smokers (OR = 0.72). The effect of AP was significant in younger patients (OR = 1.33), males (OR = 1.40), and non-smokers (OR = 1.36). CO was related only with non-smokers (OR = 1.35) Conclusion: The triggering factors for spontaneous pneumothorax were relative humidity, carbon monoxide, and air pressure. The effect of the trigger was prominent in patients who were younger (<45 years), non- or ex-smokers, and male. The reviews of this paper are available via the supplemental material section.

scholarly journals Adhiyajña: Towards a Performance Grammar of the Vedas

Religions ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 394 ◽  
Author(s):  
Smith
Keyword(s):  
South Asia ◽  
Religious Literature ◽  
Recent Scholarship ◽  
Performance Context ◽  
And Performance ◽  
The Relationship ◽  
Self Reference ◽  
A Performance

Recent scholarship has challenged the anachronistic projection of the modern category of the poem onto premodern texts. This article attempts to theorize how one might construct an alternative to modern conceptualizations of “the poem” that more closely appropriates the conceptualization of textuality in the Rigveda, an anthology of 1028 sūktas “well-spoken (texts)” that represents the oldest religious literature in South Asia. In order to understand what these texts are and what they were expected to do, this article examines the techniques by which the Rigveda refers to itself, to its performer, to its audience, and to the occasion of its performance. In so doing, this article theorizes a “performance grammar” comprising three axes of textual self-reference (spatial, temporal, and personal); these axes of reference constitute a scene of performance populated by rhetorically constructed speakers and listeners. This performance narrative, called here the adhiyajña level, frames the mythological narratives of the text. By examining the relationship between mythological narrative and performance narrative, we can better understand the purpose of performing a text and thus what kind of an entity Rigvedic “texts” really are. While this article proposes a rubric specifically for the Rigvedic context, its principles can be adapted to other premodern texts in order to better understand the performance context they presuppose.

Tongue–Palate Contact Pressure, Oral Air Pressure, and Acoustics of Clear Speech

2013 ◽  
Vol 56 (3) ◽  
pp. 826-839 ◽  
Author(s):  
Jeff Searl ◽  
Paul M. Evitts
Keyword(s):  
Contact Pressure ◽  
Air Pressure ◽  
Speaking Rate ◽  
Clear Speech ◽  
Speech Acoustics ◽  
Relationship Of ◽  
The Relationship ◽  
Speech Clarity ◽  
Normal Speech ◽  
Listener Ratings

Purpose The authors compared articulatory contact pressure (ACP), oral air pressure (Po), and speech acoustics for conversational versus clear speech. They also assessed the relationship of these measures to listener perception. Method Twelve adults with normal speech produced monosyllables in a phrase using conversational and clear speech. Target phonemes were /t, d, s, z, l, n/. ACP was measured at a point of articulatory contact; Po was sensed by a catheter open in the posterior oral cavity. Results ACP was increased to a greater extent in clear speech for /t, d, z/. Po was increased to a greater extent for /t, d/. Acoustic changes also occurred in terms of segment durations, speaking rate, and CV dB ratio. Regression analysis indicated that segment duration was the strongest predictor of listener ratings of speech clarity, followed by an index of articulatory effort and speaking rate. Conclusion Articulatory effort, as indexed by ACP, Po, and CV dB ratio, was increased to varying degrees depending on the consonant. Greatest changes occurred for /t, d/. Durational measures at both the segment and the phrase level were also important for predicting listener ratings of speech clarity.

Modelling the process of falling behind and its psychophysiological consequences

2017 ◽  
Vol 52 (23) ◽  
pp. 1523-1528 ◽  
Author(s):  
Andreas Venhorst ◽  
Dominic Micklewright ◽  
Timothy D Noakes
Keyword(s):  
Structural Equation ◽  
High Performance ◽  
Structural Model ◽  
Dynamic Change ◽  
Outcome Variable ◽  
Performance Decrement ◽  
Linear Relationships ◽  
Action Crisis ◽  
The Relationship ◽  
A Performance

IntroductionA preceding article investigated the psychophysiological responses to falling behind a performance matched opponent. The following temporally linked cause–effect relationships were hypothesised: falling behind precedes deterioration in valence, deterioration in valence precedes development of an action crisis, experience of an action crisis precedes psychoneuroendocrinological distress response and non-adaptive distress response reduces conduciveness to high performance, thereby preceding performance decrement.MethodsIn this article, we applied structural equation modelling to test the extent to which the observed data fit the hypothesised cause–effect relationships. A five-step procedure was applied to model the interrelationships between the major study variables in the hypothesised temporal order.ResultsSignificant linear relationships were found between all hypothesised predictor and outcome variable pairs (p<0.024). The dynamic change in valence was a significant mediator (p=0.011) as it explained 35% of the relationship between falling behind and action crisis. All hypothesised cause–effect relationships continued to be significant after controlling for performance, descriptor, training and perceived strain variables. The observed data fitted the hypothesised structural model well with excellent model fit indices throughout.ConclusionWe applied, tested and confirmed the hypothesised debilitative psychophysiological processes that unfold in response to falling behind a performance matched opponent. The main findings were: deterioration in valence mediated the relationship between falling behind and action crisis, the mindset shift associated with an action crisis predicted increased blood cortisol concentrations and non-adaptive blood cortisol concentrations predicted performance decrement. The findings point towards the crucial role of affective and cognitive modifiers in centrally regulated and goal-directed exercise behaviour.

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