Effect of rest periods on the endurance of notched duralumin specimens under program loading

1977 ◽  
Vol 9 (7) ◽  
pp. 846-848
Author(s):  
N. A. Vishnyakov ◽  
G. D. Gringauz ◽  
G. F. Rudzei
Keyword(s):  
Program Loading ◽  
Rest Periods

Rheometers, Bioreactors, and Vocalization Forces: Using Basic Science Investigations to Help the Voices of Teachers

2008 ◽  
Vol 18 (3) ◽  
pp. 119-125
Author(s):  
Sarah Klemuk
Keyword(s):  
Basic Science ◽  
Tissue Growth ◽  
University Of Iowa ◽  
Support Cell ◽  
Rest Periods ◽  
Collaborative Studies ◽  
Professional Voice Users ◽  
The University ◽  
Science Investigations ◽  
Professional Voice

Abstract Collaborative studies at the University of Iowa and the National Center for Voice and Speech aim to help the voices of teachers. Investigators study how cells and tissues respond to vibration doses simulating typical vocalization patterns of teachers. A commercially manufactured instrument is uniquely modified to support cell and tissue growth, to subject tissues to vocalization-like forces, and to measure viscoelastic properties of tissues. Through this basic science approach, steps toward safety limits for vocalization and habilitating rest periods for professional voice users will be achieved.

Detachment From Work in Airport Hotels

2012 ◽  
Vol 2 (1) ◽  
pp. 20-24 ◽  
Author(s):  
Ben J. Searle
Keyword(s):  
Home Base ◽  
Airline Pilots ◽  
Psychological Detachment ◽  
Rest Periods ◽  
Psychological Detachment From Work

The work of airline pilots is demanding and must be followed by rest periods (slips) so that pilots recover sufficiently well to keep flying safely. When slips occur away from home base, pilots are usually accommodated in a hotel. This paper reviews the phenomenon of psychological detachment from work (i.e., not thinking about work) and its implications for pilot accommodation and recovery. The review suggests that pilots accommodated in hotels located in or close to airports may be less able to psychologically detach from work during slips, with implications for recovery, fatigue, and ultimately safety. The paper presents a rationale for considering psychological detachment from work when evaluating the quality of hotels chosen for pilots.

Overview of recent cases before the Court of Justice of the European Union (November 2020-March 2021)

2021 ◽  
pp. 138826272110092
Author(s):  
Pauline Melin
Keyword(s):  
Parental Leave ◽  
The European Union ◽  
Framework Agreement ◽  
The Third ◽  
Court Of Justice ◽  
Rest Periods ◽  
First Case ◽  
Family Benefits ◽  
Grand Chamber ◽  
Italian Legislation

In this reporting period (November 2020-March 2021), five cases will be presented. The first case is INPS v WS (C-302/19), dealing with the Italian legislation that excludes Single Permit holders from receiving family benefits for their family members residing in a third country. In the second report, two cases rendered on the same day by the Grand Chamber of the Court are discussed. In D.J. v Radiotelevizija Slovenija (C-344/19) and RJ v Stadt Offenbach am Main (C-580/19), the Court clarified the circumstances under which periods of stand-by time could be considered as ‘working time’ or, alternatively, ‘rest periods’ under Directive 2003/88. XI v Caisse pour l’avenir des enfants (C-129/20) is the third case reported. It concerns an interpretation of the Framework Agreement on parental leave in the light of the Luxembourg legislation, which requires parents to be employed at the time of their child’s birth to benefit from parental leave. Finally, the case report ends with VL v Szpital Kliniczny im. dra J. Babińskiego Samodzielny Publiczny Zakład Opieki Zdrowotnej w Krakowie (C-16/19), a case of discrimination on grounds of disability.

Better Assessment of Bituminous Materials Lifetime Accounting for the Influence of Rest Periods

2005 ◽  
Vol 6 (2) ◽  
pp. 175-195 ◽  
Author(s):  
Denys Breysse ◽  
Vincent Domec ◽  
Sylvie Yotte ◽  
Chantal De La Roche
Keyword(s):  
Bituminous Materials ◽  
Rest Periods

Morphophysiological studies of the shoot apex. I. Recurrent growth flushes and their relationship with structural changes in the growing apex of Callistemon viminalis

1968 ◽  
Vol 46 (10) ◽  
pp. 1287-1295 ◽  
Author(s):  
A. N. Purohit ◽  
K. K. Nanda
Keyword(s):  
Structural Changes ◽  
Rest Period ◽  
Growth Cycle ◽  
Active Period ◽  
Active Growth ◽  
Histological Changes ◽  
Floral Buds ◽  
Rest Periods ◽  
Number Of Leaves ◽  
Callistemon Viminalis

The annual growth cycle of Callistemon viminalis consists of three phases: (1) a reproductive phase that continues till the end of February; (2) a vegetative phase that lasts from the end of February till the end of August; and (3) a long dormant phase which lasts till the end of December. The cycle exhibits four growth flushes with alternating periods of active growth and rest. The duration of the successive rest periods increases, leading eventually to the onset of the long dormant phase.The growing apex exhibits more or less similar histological changes in different growth flushes. An increase in divisional activity of the cells of flanking meristem, accompanied by a decline in the elongation of cells of pith rib meristem, characterizes the rest period. During the active period of growth, the cells of the pith rib meristem elongate but the activity of the flanking meristem decreases. The number of leaves produced in each growth flush, therefore, is dependent upon the duration of the preceding rest period, and their size and nature on the duration of active growth. In growth flush 1 the cells of the rib meristem show elongation twice during the active period corresponding with the separation of floral buds and of foliage leaves respectively. In the long dormant phase, on the other hand, the cells of the flanking meristem show high divisional activity twice, first during September when new leaf primordia are initiated, and again during November when floral buds are initiated. Events of great significance thus occur during the long dormant phase. The reproductive development is characterized by a marked increase in the rate of cell division in the flanking meristem accompanied by cessation of growth, the features that characterize the rest period as well.

Effect of Healing on Fatigue Law Parameters of Asphalt Binders

2012 ◽  
Vol 2293 (1) ◽  
pp. 96-105 ◽  
Author(s):  
Arianna Stimilli ◽  
Cassie Hintz ◽  
Zhijun Li ◽  
Raul Velasquez ◽  
Hussain U. Bahia
Keyword(s):  
Fatigue Life ◽  
Asphalt Binder ◽  
Rest Period ◽  
Power Laws ◽  
Asphalt Binders ◽  
Traffic Loading ◽  
Damage Level ◽  
Rest Periods ◽  
Pavement Structure ◽  
Number Of Cycles

Asphalt binder has the ability to self-heal during rest periods when repetitive loading is applied. Studying the effect of rest on fatigue law parameters provides useful insight into the healing capabilities of asphalt binders. Currently, standard testing and analysis procedures to quantify asphalt binder healing capability are limited and difficult to implement in practice. Fatigue is known to depend on both traffic loading and pavement structure. Power law relations (e.g., Nf = Aγ−B) are commonly used for fatigue analysis of pavement materials. Power laws are used to estimate fatigue life (i.e., number of cycles to failure, Nf) as a function of load amplitude (e.g., strain, γ), which is a reflection of the pavement structure. In this study, testing consisted of strain-controlled time sweeps in the dynamic shear rheometer with a single rest period inserted at a specified damage level. With the selected test, the effect of healing on the relationship between fatigue life and strain was investigated. Nine neat and modified binders were tested. Healing testing was conducted at multiple age levels and strains. Healing that resulted from a single rest period had an insignificant effect on fatigue performance compared with modification and oxidative aging. Although this paper highlights the challenges of using few rest periods to predict healing potential, preliminary results of testing with multiple rest periods show the importance of healing. Further investigation is needed to verify the effect of multiple rest periods on binder fatigue.

The effect of hand immersion on body temperature when wearing impermeable clothing

1991 ◽  
Vol 77 (1) ◽  
pp. 41-47
Author(s):  
A. J. Allsopp ◽  
Kerry A. Poole
Keyword(s):  
Body Temperature ◽  
Skin Temperature ◽  
Environmental Temperature ◽  
List Type ◽  
Physiological Measures ◽  
Total Work ◽  
Mean Skin Temperature ◽  
Work Time ◽  
Experimental Conditions ◽  
Rest Periods

AbstractThe effects of hand immersion on body temperature have been investigated in men wearing impermeable NBC clothing. Six men worked continuously at a rate of approximately 490 J.sec−1 in an environmental temperature of 30°C. Each subject was permitted to rest for a period of 20 minutes when their aural temperature reached 37.5°C, and again on reaching 38°C, and for a third time on reaching 38.5°C (three rest periods in total). Each subject completed three experimental conditions whereby, during the rest periods they either: a.Did not immerse their hands (control).b.Immersed both hands in a water bath set at 25°c.c.Immersed both hands in water at 10°C.Physiological measures of core temperature, skin temperature and heart rate were recorded at intervals throughout the experiment.Measures of mean aural temperature and mean skin temperature were significantly (P<0.05) reduced if hands were immersed during these rest periods, compared to non immersion. As a result, the total work time of subjects was extended when in the immersed conditions by some 10–20 minutes within the confines of the protocol.It is concluded that this technique of simple hand immersion may be effective in reducing heat stress where normal routes to heat loss are compromised.

THE EFFECT OF INTENSITY OF DEFOLIATION ON ROOT DEVELOPMENT AND PRODUCTION IN SOME PASTURE-GRASS SPECIES

1937 ◽  
pp. 140-146
Author(s):  
W.A. Jacques
Keyword(s):  
Root System ◽  
Root Development ◽  
Grass Species ◽  
Pasture Grass ◽  
Rest Periods ◽  
Pasture Plants

There are many points of approach to a consideration of root development in pasture plants, but I wish to confine myself to this effect on the root system of different rest periods between the removal of leaves and outline the plants reaction to them

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