scholarly journals The determination of glacier speed by time-lapse photography under unfavorable conditions

1992 ◽  
Vol 38 (129) ◽  
pp. 257-265 ◽  
Author(s):  
W.D. Harrison ◽  
K.A. Echelmeyer ◽  
D.M. Cosgrove ◽  
C. F. Raymond
Keyword(s):  
Time Lapse ◽  
Systematic Errors ◽  
Horizontal Motion ◽  
Limited Information ◽  
Glacier Surface ◽  
Alaska Range ◽  
Use Of Time ◽  
West Fork ◽  
Time Lapse Photography

AbstractTwo practical problems in the use of time-lapse photography for the measurement of speed were encountered during the recent surge of West Fork Glacier in the central Alaska Range, Alaska, U.S.A. The first is severe rotational camera instability; we show how natural, unsurveyed features on the valley wall can be used to make the necessary corrections. The second problem is the computation of absolute speed when many different, unsurveyed glacier-surface features are used as targets. We give a method for connecting the data obtained from different targets, and for determining the scale using limited information obtained by surveying. Severe systematic errors can occur unless the angle between the axis of the lens and the direction of horizontal motion is determined.

scholarly journals The determination of glacier speed by time-lapse photography under unfavorable conditions

1992 ◽  
Vol 38 (129) ◽  
pp. 257-265 ◽  
Author(s):  
W.D. Harrison ◽  
K.A. Echelmeyer ◽  
D.M. Cosgrove ◽  
C. F. Raymond
Keyword(s):  
Time Lapse ◽  
Systematic Errors ◽  
Horizontal Motion ◽  
Limited Information ◽  
Glacier Surface ◽  
Alaska Range ◽  
Use Of Time ◽  
West Fork ◽  
Time Lapse Photography

AbstractTwo practical problems in the use of time-lapse photography for the measurement of speed were encountered during the recent surge of West Fork Glacier in the central Alaska Range, Alaska, U.S.A. The first is severe rotational camera instability; we show how natural, unsurveyed features on the valley wall can be used to make the necessary corrections. The second problem is the computation of absolute speed when many different, unsurveyed glacier-surface features are used as targets. We give a method for connecting the data obtained from different targets, and for determining the scale using limited information obtained by surveying. Severe systematic errors can occur unless the angle between the axis of the lens and the direction of horizontal motion is determined.

Variation in the naturally occurring rhythm of the estuarine amphipod, Corophium volutator (Pallas)

1983 ◽  
Vol 63 (4) ◽  
pp. 833-850 ◽  
Author(s):  
Walter F. Holmström ◽  
Elfed Morgan
Keyword(s):  
Activity Rhythm ◽  
Time Lapse ◽  
Early Summer ◽  
Corophium Volutator ◽  
Use Of Time ◽  
Recording Conditions ◽  
Free Running ◽  
Endogenous Activity ◽  
Free Running Period ◽  
Time Lapse Photography

The endogenous activity rhythm of the estuarine amphipod Corophium volutator has been studied by direct observation and with the use of time lapse photography. The rhythm persists under constant conditions having a free running period of between 12 and 13 h, and with activity maxima occurring during the early ebb. Freshly collected animals show a rhythm which is modulated on a semi-lunar basis, the activity maxima being attenuated during the neap tide periods, and the rhythm has also been found to vary in definition throughout the year. The activity pattern is most clearly denned in early summer and autumn, the population becoming arrhythmic during the winter months. The rhythm is relatively unaffected by the ambient light intensity and temperature of the recording conditions, and is evident in all post-natal stages of development. The possibility of mutual entrainment is discussed.

Use of Time-Lapse Photography in Tobacco-Curing Research

1968 ◽  
Vol 11 (3) ◽  
pp. 0409-0411
Author(s):  
W. H. Henson ◽  
Jr. ◽  
J. M. Bunn and G. A. Duncan
Keyword(s):  
Time Lapse ◽  
Use Of Time ◽  
Time Lapse Photography

‘No More Unexplored Countries’: The Early Promise and Disappointing Career of Time-Lapse Photography

Film Studies ◽  
2006 ◽  
Vol 9 (1) ◽  
pp. 1-8 ◽  
Author(s):  
David Lavery
Keyword(s):  
Twentieth Century ◽  
Human Perception ◽  
Time Lapse ◽  
Ernst Mach ◽  
Use Of Time ◽  
Extended Duration ◽  
Time Lapse Photography

Time-lapse photography—the extremely accelerated recording and projection of an event taking place over an extended duration of time—is almost as old as the movies themselves. (The first known use of time-lapse dates from 1898.) In the early decades of the twentieth century, cineastes, not to mention scientists, artists, and poets, waxed eloquently on the promise of time-lapse photography as a means for revealing “things we cannot see,” and expanding human perception. This essay examines time-lapses tremendous initial imaginative appeal for such figures as Ernst Mach, Germaine Dulac, Jean Epstein, Rudolf Arnheim, Laszlo Moholy-Nagy, and Collette, and speculates about the possible reasons for its diminution over the course of the century.

P–222 Can we optimise the time that we perform the fertilisation check in the lab? Lessons learnt from time-lapse incubation

2021 ◽  
Vol 36 (Supplement_1) ◽  
Author(s):  
A Barrie ◽  
R Smith ◽  
L Best ◽  
N Davis ◽  
S Duffy ◽  
...  
Keyword(s):  
Study Design ◽  
Fetal Heart ◽  
Time Lapse ◽  
Trial Registration ◽  
Optimum Time ◽  
Use Of Time ◽  
Lessons Learnt ◽  
Registration Number

Abstract Study question Can time-lapse data be used to identify the optimum time to perform the fertilisation check for oocytes cultured in standard incubation? Summary answer The optimum time to perform fertilisation checks for oocytes cultured in standard incubation is 16.5hpi+/–0.5h. What is known already Time-lapse incubation allows the embryologist to retrospectively review collated images of oocytes and embryos to capture important embryological observations that may have otherwise been missed. This is a luxury not available to embryologists when oocytes or embryos are cultured in standard incubation. Traditionally, the optimum time to perform the fertilisation check is 17 hours post insemination (hpi) +/- 1 hour. It was hypothesised that this could be fine-tuned ensuring the maximum number of fertilised oocytes were observed, thereby increasing the number of usable embryos for the patient. Study design, size, duration This was a retrospective, multicentre analysis including data from 27,022 ICSI derived embryos cultured in time-lapse incubation between January 2011 to November 2019. Participants/materials, setting, methods The time of pronuclei appearance and disappearance was recorded using the time-lapse incubation software. The number of oocytes exhibiting normal fertilisation (defined as the presence of two pronuclei) during 30 minute intervals from 15hpi to 20hpi was determined. Main results and the role of chance Between 15–17.5hpi the average number of oocytes exhibiting normal fertilisation was 98.19% with most oocytes having visible pronuclei at 16–16.5hpi (98.32%). At 18–18.5hpi the number of visible pronuclei falls to 95.53% and continues to fall to 87.02% at 19.5–20hpi meaning that over 3000 (11%) normally fertilised oocytes, within this cohort, would not be identified. Limitations, reasons for caution The conclusions of this investigation cannot be effectively extrapolated to IVF embryos as only ICSI embryos were used for the determination of the results. Wider implications of the findings: The optimum time to perform fertilisation checks for oocytes cultured in standard incubation is 16.5hpi+/–0.5h. However, without the use of time-lapse incubation, the fertilisation of at least 2% of embryos that create a fetal heart will be missed, even if the fertilisation check is performed in the optimum window (16.5hpi+/–0.5h). Trial registration number Not applicable

Potential Use of Time-Lapse Images: Determination of Circumnutational Movement to Assess Plant Vigor

2013 ◽  
Author(s):  
K. Iwabuchi and M.Hirafuji
Keyword(s):  
Time Lapse ◽  
Plant Vigor ◽  
Use Of Time ◽  
Potential Use

USE OF TIME-LAPSE PHOTOGRAPHY TO ASSESS POTENTIAL INTERCEPTION IN ARIZONA PONDEROSA PINE

1974 ◽  
Vol 10 (6) ◽  
pp. 1246-1254 ◽  
Author(s):  
Larry C. Tennyson ◽  
Peter F. Ffolliott ◽  
David B. Thorud
Keyword(s):  
Ponderosa Pine ◽  
Time Lapse ◽  
Use Of Time ◽  
Time Lapse Photography

Time-Lapse Photography of an ASDIC Echo-Sounder PPI-Scope as a Technique for Recording Fish Movements During Migration

1965 ◽  
Vol 22 (4) ◽  
pp. 1025-1034 ◽  
Author(s):  
C. Groot ◽  
W. L. Wiley
Keyword(s):  
Sockeye Salmon ◽  
Target Identification ◽  
Time Lapse ◽  
Large Lake ◽  
Migratory Activity ◽  
Scanning Rate ◽  
Meaningful Information ◽  
Use Of Time ◽  
Time Motion ◽  
Time Lapse Photography

The use of time-lapse photography in combination with sonar as a means of observing the sockeye salmon (Oncorhynchus nerka) smolt migration in a large lake is discussed. A description of the gear used is given with some examples of the type of information that can be derived from this technique.The scanning rate of the sonar equipment used, combined with time-lapse photography, resulted in a compression of time to [Formula: see text] when scanning at a range of 400 ft and to [Formula: see text] at a range of 800 ft. A 24-hr period may thus be viewed on film in respectively S and [Formula: see text] when projected at a speed of 24 frames/sec. This speeded-up process facilitates separation of moving targets from stationary ones, even in the clutter of surface and/or ground echoes.Although subject to all the usual vagaries of target identification which accompany use of all echo-sounding gear, analysis of the movies with a time-motion projector appears to give meaningful information on such parameters as the speed and direction of migration or movement, and the distribution of migratory activity throughout a 24-hr period.

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