Automatic detection of short time periodic bird calls in realistic monitoring scenarios

2008 ◽  
Vol 123 (5) ◽  
pp. 3099-3099
Author(s):  
Daniel Wolff ◽  
Klaus H. Tauchert ◽  
Karl H. Frommolt ◽  
Rolf Bardeli ◽  
Frank Kurth ◽  
...  
Keyword(s):  
Automatic Detection ◽  
Bird Calls ◽  
Short Time ◽  
Time Periodic

scholarly journals Search for short-time periodic variations among WR+C binaries

1995 ◽  
Vol 163 ◽  
pp. 562-564
Author(s):  
S.V. Marchenko ◽  
I.I. Antokhin ◽  
J.-F. Bertrand ◽  
R. Lamontagne ◽  
A.F.J. Moffat ◽  
...  
Keyword(s):  
Binary System ◽  
Time Resolution ◽  
Roche Lobe ◽  
Secondary Component ◽  
Rapid Phase ◽  
New Born ◽  
Short Time ◽  
Time Periodic

During the 1992–1993 observing season, WR3, 6, 16, 40, 66, 82 and 134 were monitored in fast photometry mode with time-resolution 0.005—0.01 s. Only WR6 reveals a possible period of P = 0.11 s (semi-amplitude A = 0.025 mag), which is close to the derived equilibrium period of a new-born pulsar in a binary system after the rapid phase of Roche Lobe Over-Flow from the original secondary component.

scholarly journals Lagrangian structures in time-periodic vortical flows

2006 ◽  
Vol 13 (6) ◽  
pp. 621-628 ◽  
Author(s):  
S. V. Kostrykin ◽  
A. A. Khapaev ◽  
V. M. Ponomarev ◽  
I. G. Yakushkin
Keyword(s):  
Velocity Field ◽  
Temporal Change ◽  
Regular Structures ◽  
Flow Parameters ◽  
Qualitative Interpretation ◽  
Time Period ◽  
Long Time ◽  
Adiabatic Chaos ◽  
Short Time ◽  
Time Periodic

Abstract. The Lagrangian trajectories of fluid particles are experimentally studied in an oscillating four-vortex velocity field. The oscillations occur due to a loss of stability of a steady flow and result in a regular reclosure of streamlines between the vortices of the same sign. The Eulerian velocity field is visualized by tracer displacements over a short time period. The obtained data on tracer motions during a number of oscillation periods show that the Lagrangian trajectories form quasi-regular structures. The destruction of these structures is determined by two characteristic time scales: the tracers are redistributed sufficiently fast between the vortices of the same sign and much more slowly transported into the vortices of opposite sign. The observed behavior of the Lagrangian trajectories is quantitatively reproduced in a new numerical experiment with two-dimensional model of the velocity field with a small number of spatial harmonics. A qualitative interpretation of phenomena observed on the basis of the theory of adiabatic chaos in the Hamiltonian systems is given. The Lagrangian trajectories are numerically simulated under varying flow parameters. It is shown that the spatial-temporal characteristics of the Lagrangian structures depend on the properties of temporal change in the streamlines topology and on the adiabatic parameter corresponding to the flow. The condition for the occurrence of traps (the regions where the Lagrangian particles reside for a long time) is obtained.

scholarly journals Automatic detection of avalanches and debris flows by seismic methods

2007 ◽  
Vol 53 (182) ◽  
pp. 461-472 ◽  
Author(s):  
Bjarni Bessason ◽  
Gísli Eiríksson ◽  
Óðinn Thorarinsson ◽  
Andrés Thórarinsson ◽  
Sigurður Einarsson
Keyword(s):  
Debris Flows ◽  
Automatic System ◽  
Traffic Accidents ◽  
Automatic Detection ◽  
Weather Conditions ◽  
The West ◽  
Research Project ◽  
The Road ◽  
Short Time ◽  
Seismic Measurements

AbstractThe road along the Óshlíð hillside in the West Fjords region of Iceland is one of the most hazardous roads in Iceland due to avalanches, rockfalls and debris flows. The road has little traffic, but nevertheless traffic accidents caused by the severe conditions at the site are common. A number of avalanche tracks are found on the hillside. In some of these tracks, avalanches occur more frequently than in others. When there is an avalanche threat, avalanches generally flow over many tracks in a short time. Monitoring vibrations in the tracks with the highest avalanche frequency can indicate when avalanches start flowing down the hillside in a snowstorm, and avalanche hazard can then be declared with the specific site indicated. The same methodology can be used for rockfalls and debris flows, which are strongly affected by weather conditions and typically occur in clusters. Based on this knowledge, a research project was initiated in February 1996 with the objective of developing an automatic system based on seismic measurements to detect and analyze avalanches on the Óshlíð hillside and to instantly send a warning to a control station.

Search for Short-Time Periodic Variations Among WR+C Binaries

1995 ◽  
pp. 562-564 ◽  
Author(s):  
S. V. Marchenko ◽  
I. I. Antokhin ◽  
J.-F. Bertrand ◽  
R. Lamontagne ◽  
A. F. J. Moffat ◽  
...  
Keyword(s):  
Short Time ◽  
Time Periodic

scholarly journals On the periodic variations of secondary cosmic rays and the geomagnetic Pc4 pulsations in BMAr

1997 ◽  
Vol 15 (8) ◽  
pp. 1009-1014 ◽  
Author(s):  
I. M. Martin ◽  
A. A. Gusev ◽  
K. Kudela ◽  
J. Kassovicova ◽  
G. I. Pugacheva
Keyword(s):  
Cosmic Rays ◽  
Magnetic Anomaly ◽  
Neutral Particle ◽  
Cosmic Ray ◽  
Periodic Variation ◽  
Local Times ◽  
Cosmic Ray Intensity ◽  
Short Time ◽  
Time Periodic ◽  
Anomaly Region

Abstract. In a set of balloon flights in the Brazilian magnetic anomaly region (BMAr) short time periodic variations were observed, i.e. pulsation, of secondary charged and neutral particle fluxes, X- and <gamma>-ray fluxes with amplitudes of about 2–4%. The pulsations are accompanied by the geomagnetic Pc4 pulsations and have similar periodicity. The phenomenon was observed over various local times and in quiet and disturbed magnetospheric conditions. One of the explanations of this effect, i.e. periodic variation of local cut-off rigidity, and following pulsations of primary and secondary cosmic ray intensity is suggested.

What the replication reformation wrought

2018 ◽  
Vol 41 ◽  
Author(s):  
Barbara A. Spellman ◽  
Daniel Kahneman
Keyword(s):  
Reform Movement ◽  
Short Time

AbstractReplication failures were among the triggers of a reform movement which, in a very short time, has been enormously useful in raising standards and improving methods. As a result, the massive multilab multi-experiment replication projects have served their purpose and will die out. We describe other types of replications – both friendly and adversarial – that should continue to be beneficial.

Periodic Variations in the Coronal Green Line Intensity and their Connection with the White-light Coronal Structures

2000 ◽  
Vol 179 ◽  
pp. 197-200
Author(s):  
Milan Minarovjech ◽  
Milan Rybanský ◽  
Vojtech Rušin
Keyword(s):  
Time Resolution ◽  
White Light ◽  
Short Time Scale ◽  
High Time Resolution ◽  
Green Line ◽  
Periodic Intensity ◽  
Coronal Green Line ◽  
Significant Intensity ◽  
Short Time ◽  
Coronal Structures

AbstractWe present an analysis of short time-scale intensity variations in the coronal green line as obtained with high time resolution observations. The observed data can be divided into two groups. The first one shows periodic intensity variations with a period of 5 min. the second one does not show any significant intensity variations. We studied the relation between regions of coronal intensity oscillations and the shape of white-light coronal structures. We found that the coronal green-line oscillations occur mainly in regions where open white-light coronal structures are located.

Destruction of Actin Filaments by Osmium Tetroxide

1977 ◽  
Vol 35 ◽  
pp. 466-467
Author(s):  
P. Maupin-Szamier ◽  
T. D. Pollard
Keyword(s):  
Actin Filaments ◽  
Time Course ◽  
Osmium Tetroxide ◽  
Rabbit Muscle ◽  
Muscle Actin ◽  
Sodium Phosphate Buffer ◽  
Transmission Electron ◽  
The Difference ◽  
Rates Of Decay ◽  
Short Time

We have studied the destruction of rabbit muscle actin filaments by osmium tetroxide (OSO4) to develop methods which will preserve the structure of actin filaments during preparation for transmission electron microscopy.Negatively stained F-actin, which appears as smooth, gently curved filaments in control samples (Fig. 1a), acquire an angular, distorted profile and break into progressively shorter pieces after exposure to OSO4 (Fig. 1b,c). We followed the time course of the reaction with viscometry since it is a simple, quantitative method to assess filament integrity. The difference in rates of decay in viscosity of polymerized actin solutions after the addition of four concentrations of OSO4 is illustrated in Fig. 2. Viscometry indicated that the rate of actin filament destruction is also dependent upon temperature, buffer type, buffer concentration, and pH, and requires the continued presence of OSO4. The conditions most favorable to filament preservation are fixation in a low concentration of OSO4 for a short time at 0°C in 100mM sodium phosphate buffer, pH 6.0.

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