scholarly journals Stellar Photometric Observations at Hα Through a Narrow-Band Interference Filter

1976 ◽  
Vol 70 ◽  
pp. 51-58
Author(s):  
Hugh E. Butler
Keyword(s):  
Narrow Band ◽  
Interference Filter ◽  
The Other ◽  
Be Stars ◽  
Strong Emission ◽  
Photometric Observations ◽  
Long Term Changes ◽  
The Doppler Effect ◽  
Photoelectric Observations

The paper describes the results of stellar photoelectric observations made with a small telescope and a 3 1/2 Å wide filter centred at Hα.The method proved to be a sensitive one for detecting change in the spectrum but did not allow differentiation between changes in the Hα profile and wavelength changes due only to the Doppler effect. It was possible, however, to recognise and qualitatively to eliminate the Doppler changes due to the Earth's Annual Motion.Of ten Be stars examined three, although in strong emission, showed little change over the periods of observation, the longest of which was 9 months. The other seven showed large and random changes.Warnings are given about the difficulty of tuning such a filter exactly to Hα and the need to monitor accurately the filter for long term changes in passband and throughput.

scholarly journals Multimode Detections from Surveys

2000 ◽  
Vol 175 ◽  
pp. 192-204
Author(s):  
C. Aerts
Keyword(s):  
High Accuracy ◽  
The Other ◽  
Time Base ◽  
Be Stars ◽  
Preliminary Results ◽  
Other Hand ◽  
Multiple Frequencies

AbstractIn this study we present an overview of the search for multiple frequencies in variable Be stars from surveys. We review the recent ground-based photometric surveys and conclude from them that multiperiodicity is not detected. The photometric experiment on board Hipparcos, on the other hand, does allow us to derive multiple periods for a few Be stars. We present the results of our frequency searches in the Hipparcos data for 50 λ Eri stars.Further we review the recent spectroscopic campaigns dedicated to some stars. It seems that all of these campaigns point to multiperiodic phenomena, although for most of them the time base is insufficient to derive the periods with high accuracy. Moreover, the spectroscopic periods are often not the same as those found from the photometry. This clearly demonstrates the necessity of long-term simultaneous photometric and spectroscopic campaigns. We present the preliminary results of such a campaign for the λ Eri star HD 105382.We close with reflections on the cause of the variability observed in the λ Eri stars and on the best viewpoint for further research in this area.

Notation and identity in contemporary popular music

Popular Music ◽  
1983 ◽  
Vol 3 ◽  
pp. 215-234 ◽  
Author(s):  
H. Stith Bennett
Keyword(s):  
Popular Culture ◽  
Popular Music ◽  
Classical Music ◽  
The Other ◽  
Other Hand ◽  
The World ◽  
Long Term Changes ◽  
Western European ◽  
Rock N Roll

Popular music, like all manifestations of popular culture, lives on in spite of recurring criticisms that cast it as somehow inauthentic. In fact, defences against this discounting are built into popular music (for example, the Rolling Stones' classic: ‘It's only rock 'n' roll but I like it’) and built in, as well, to the identities of those who make the music a part of their lives, be they players, producers, consumers or critics. On the other hand, so-called classical music, not unlike other manifestations of Western European art culture, lives on in spite of popular music and provides the touchstone of authenticity that creates the defensive popular response. The ideas I am advancing here are intended to allow the players in this authenticity contest to be recognised as evidence of unique historical circumstances: recognised, that is, not only as stock dramatists of ethnocentrism, but as indicators of long-term changes in music cultures in all parts of the world.

Interference filter spectral imaging of twilight O<sup>+</sup>(<sup>2</sup>P-<sup>2</sup>D) emission

1995 ◽  
Vol 13 (2) ◽  
pp. 189-194
Author(s):  
Y. Ma ◽  
R. N. Peterson ◽  
S. P. Zhang ◽  
I. C. McDade ◽  
R. H. Wiens ◽  
...  
Keyword(s):  
Atomic Oxygen ◽  
Emission Rate ◽  
Narrow Band ◽  
Rotational Temperature ◽  
Model Atmosphere ◽  
Interference Filter ◽  
Oxygen Profile ◽  
Spectral Imager ◽  
Good Agreement

Abstract. A spectral imager specifically designed to measure the O+(2P-2D) emission in the thermosphere during twilight has been constructed and tested in Toronto (43.8°N, 79.3°W), and found to show promise for long-term and campaign-mode operations. A modification of the mesopause oxygen rotational temperature imager (MORTI), it consists basically of a narrow-band interference filter (0.14 nm bandwidth) to separate wavelengths as a function of off-axis angle, a lens to focus the spectrum into a series of concentric rings, and a focal plane array (CCD) to record the spectral images in digital form. The instrument was built with two fields of view, one for the zenith and one for 20° above the horizon, movable to track the azimuth of the Sun, in order to provide appropriate data for inversion. Data gathered during June 1991 provided measurements of the column-integrated emission rate with a precision of about 3%. An atomic oxygen profile was deduced that showed good agreement with that predicted by the MSIS-90 model atmosphere. Geomagnetically induced variations of the O+ lines, calcium spectra resulting from meteor showers, and OH nightglow were also observed.

scholarly journals Monitoring and analyzing exoplanetary transits from Argentina

2010 ◽  
Vol 6 (S276) ◽  
pp. 416-417
Author(s):  
Eduardo Fernández-Lajús ◽  
Yamila Miguel ◽  
Andrea Fortier ◽  
Romina P. Di Sisto
Keyword(s):  
The Other ◽  
Orbital Inclination ◽  
Stellar Radius ◽  
Orbital Parameters ◽  
Photometric Observations ◽  
First Results ◽  
Orbital Precession ◽  
In Transit ◽  
Observational Program

AbstractPhotometric observations of transits can be used to derive physical and orbital parameters of the system, like the planetary and stellar radius, orbital inclination and mean density of the star. Furthermore, monitoring possible periodic variations in transit timing of planets is important, since small changes can be caused by the presence of other planets or moons in the system. On the other hand, long term changes in the transit length can be due to the orbital precession of the planets. For these reasons we started an observational program dedicated to observe transits of known exoplanets with the aim of contributing to a better understanding of these planetary systems. In this work we present our first results obtained using the observational facilities in Argentina including the 2.15 telescope at CASLEO.

Effect of Preservation on the Weight of Marine Benthic Invertebrates

1982 ◽  
Vol 39 (1) ◽  
pp. 221-224 ◽  
Author(s):  
Eric L. Mills ◽  
Karin Pittman ◽  
Brent Munroe
Keyword(s):  
Benthic Invertebrates ◽  
Dry Weight ◽  
The Other ◽  
Tissue Composition ◽  
Fresh Weight ◽  
Short Term ◽  
Long Term Changes ◽  
Biomass Determination ◽  
Marine Benthic Invertebrates

It would be convenient if preserved animals could be used to determine fresh-weight biomass. However, marine annelids, nematodes, bivalves, amphipods, and isopods all lost weight when preserved and stored in 70% isopropanol. In 10% formalin only bivalves lost weight significantly; the other groups showed evidence of small increases or decreases. Many animals preserved in alcohol decreased sharply in weight within a few minutes, probably due to dehydration. In formalin most increased at first, then slowly decreased. The response to preservatives is complex, involving short-term changes of water content and long-term changes of tissue composition. Precision, though not accuracy, of preserved wet weights can only be achieved after specimens have been in preservatives for a month or more, especially in the case of isopropanol. For these reasons, wet and dry weight biomass figures should be determined from fresh, unpreserved animals.Key words: fixation, preservation (organisms), biomass determination, benthos

scholarly journals Dynamic Laser Speckle Technique Sensing Long-Term Changes Caused by Painting Treatments in Restauration of Paintings

2017 ◽  
Author(s):  
Alberto J. Pérez ◽  
Rolando J. González-Peña ◽  
Roberto Braga Jr ◽  
Ángel Perles ◽  
Eva Pérez–Marín ◽  
...  
Keyword(s):  
Traditional Method ◽  
Laser Speckle ◽  
The Other ◽  
Portable Equipment ◽  
Time Rate ◽  
Alternative Approach ◽  
Long Term Changes ◽  
Slow Activity ◽  
Low Activity

Dynamic laser speckle is applied as a reliable sensor of activity in all sort of material. Traditional applications are based on a time rate that is usually higher than 10 frames-per-second (FPS). Even in drying processes, where there is a high activity in the first moments after the painting and a slow activity after some minutes or hours, the process is based on the acquisition of images in a time rate that is the same in both moments of high and low activity. In this work, we present an alternative approach to follow the drying of paint and the other processes related to restauration of paintings that takes long-term to reduce the activity. We illuminated, using three different wavelength lasers, an accelerator (Cyclododecane) and a varnish used in restauration of paintings and monitor them at long-term drying using an alternative fps, comparing the results to the traditional method. The work also presents a way to do the monitoring using a portable equipment. The results present the feasibility to use the portable device and show the improvement in the sensitivity of the dynamic laser speckle to sense long-term process regarding the drying of Cyclododecane and Varnish used in restauration.

scholarly journals The Long Term Changes in Liver DNA and Total Protein Contents Following Low Level Sarin Exposure in Rats

2000 ◽  
Vol 43 (1) ◽  
pp. 19-22 ◽  
Author(s):  
Jiří Kassa ◽  
František Skopec ◽  
Josef Vachek
Keyword(s):  
Nucleic Acids ◽  
Total Protein ◽  
Protein Metabolism ◽  
Tritiated Thymidine ◽  
The Other ◽  
Low Level ◽  
Long Term Changes ◽  
Level 3 ◽  
Total Concentrations

1. The changes in contents of DNA and total protein in the liver of the rats exposed to low level sarin by inhalation at 3, 6 and 12 months following the exposure were studied. The influence of sarin on the DNA and protein metabolism in liver was determinated by the measurements of incorporation of tritiated thymidine into DNA, the concentration of DNA and total protein. 2. Our results show that not only symptomatic level 3 but also asymptomatic levels 1 and 2 of sarin are able to significantly decrease the incorporation of radiolabelled thymidine without changing total concentrations of DNA as well as protein at three months following sarin exposure. On the other hand, the significant decrease in total contents of DNA and protein in liver without the changes in the incorporation of tritiated thymidine was determined in liver six months following sarin exposure. Practically no significant changes in the metabolism of DNA and protein were observed at 12 months following sarin exposure. 3. Thus, not only clinically manifested intoxication but also low-level, asymptomatic exposure to nerve agents such as sarin is able to influence the metabolism of nucleic acids as well as proteins even several months following the exposure.

Amines and a Peptide as Neurohormones in Lobsters: Actions on Neuromuscular Preparations and Preliminary Behavioural Studies

1980 ◽  
Vol 89 (1) ◽  
pp. 159-175
Author(s):  
EDWARD A. KRAVITZ ◽  
SILVIO GLUSMAN ◽  
RONALD M. HARRIS-WARRICK ◽  
MARGARET S. LIVINGSTONE ◽  
THOMAS SCHWARZ ◽  
...  
Keyword(s):  
Transmitter Release ◽  
Action Potentials ◽  
The Other ◽  
Muscle Fibres ◽  
Excitatory Neurotransmitter ◽  
Physiological Properties ◽  
Long Term Changes ◽  
Behavioural Experiments ◽  
Extended Posture

In this communication we report that four substances, thought to function as neurohormones in Crustacea, all produce long-term changes in the physiological properties of lobster opener muscle preparations. The substances are the amines, octopamine, serotonin and dopamine, and the peptide, proctolin. The actions of these substances are superimposed on the normal synaptic apparatus that utilizes the amino acids GABA and glutamate (probably) as the inhibitory and excitatory neurotransmitter compounds. Serotonin acts on excitatory and inhibitory nerve endings to facilitate transmitter release and directly on muscle fibres to produce a contracture and to induce the appearance of Ca2+ action potentials. The latter two actions of serotonin are shared by proctolin and octopamine as well. Dopamine, on the other hand, relaxes muscle baseline tension. The mechanism of action of these substances at their target site (or sites) has been explored with electrophysiological and biochemical techniques and the results will be presented. In addition preliminary behavioural experiments have been carried out with serotonin and octopamine. These substances produce opposite postures when injected into lobsters. The amines act on central ganglia to produce these effects where they cause a programmed readout of firing of neurones that will produce either a flexed posture (serotonin) or an extended posture (octopamine).

The Benefits of a Weight Loss Contest in Overweight and Obese College Students

2008 ◽  
Vol 32 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Cynthia Ferrara ◽  
Christine St. Laurent ◽  
Thomas Wilson
Keyword(s):  
Physical Activity ◽  
College Students ◽  
Body Mass Index ◽  
Weight Loss ◽  
Body Weight ◽  
The Other ◽  
Waist To Hip Ratio ◽  
Percent Change ◽  
Long Term Changes

The purpose of this study was to examine whether a weight loss contest would result in changes in body composition in college students. Students were invited to participate in a semester-long weight loss contest. Monthly “weigh-ins” included body weight, body mass index (BMI), percent fat, and circumference measurements. Thirty-nine participants registered for the contest. Only 41% of the original participants attended at least four weigh-ins ( n = 16). Those participants who attended at least four weigh-ins attended more education and exercise sessions than the other participants and significantly reduced their weight, BMI, percent fat, waist, and waist-to-hip ratio over the semester-long contest. Percent change in weight was associated with education ( r = –.39) and exercise sessions attended ( r = –.41). In conclusion, campus-based weight loss contests can be successful in promoting weight loss, although additional studies are needed to determine what factors increase adherence and whether such programs promote long-term changes in physical activity and diet.

scholarly journals Conclusions: Towards a sociology of pandemics and beyond

2021 ◽  
pp. 001139212110235
Author(s):  
Jens O Zinn
Keyword(s):  
Public Sphere ◽  
Cultural Practices ◽  
The Other ◽  
Global Learning ◽  
Long Term Changes ◽  
Technological Means ◽  
Global World

This conclusion revisits the COVID-19 pandemic from the broader perspective of a changing global world. It raises questions regarding the opportunities for global learning under conditions of global divisions and competition and includes learning from the Other, governing within a changing public sphere, and challenging national cultural practices. Moreover, it exemplifies how the society–nature–technology nexus has become crucial for understanding and reconstructing the dynamics of the coronavirus crisis such as the assemblages of geographical conditions, technological means and the governing of ignorance, the occurrence of hotspots as well as living under lockdown conditions. It finishes with some preliminary suggestions how reoccurring pandemics might contribute to long-term changes in human attitudes and behaviour towards the environment and a technologically shaped lifeworld.

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