scholarly journals Estonian marine phytobenthos monitoring programme: preliminary results and future perspectives

2003 ◽  
Vol 52 (2) ◽  
pp. 112
Author(s):  
J Kotta ◽  
G Martin ◽  
H Orav-Kotta ◽  
K Torn
Keyword(s):  
Monitoring Programme ◽  
Future Perspectives ◽  
Preliminary Results ◽  
Marine Phytobenthos

MR2251-178: Preliminary results of an X-ray monitoring programme

1985 ◽  
Vol 40 (3-4) ◽  
Author(s):  
GC Stewart ◽  
KA Pounds ◽  
VA Stanger
Keyword(s):  
Monitoring Programme ◽  
X Ray ◽  
Preliminary Results

scholarly journals Sounding stellar cycles with Kepler – preliminary results from ground-based chromospheric activity measurements

2009 ◽  
Vol 5 (S264) ◽  
pp. 57-59
Author(s):  
C. Karoff ◽  
T. S. Metcalfe ◽  
W. J. Chaplin ◽  
S. Frandsen ◽  
F. Grundahl ◽  
...  
Keyword(s):  
Stellar Evolution ◽  
Monitoring Programme ◽  
Satellite Mission ◽  
Optical Telescope ◽  
Preliminary Results ◽  
Chromospheric Activity ◽  
Activity Measurements ◽  
Solar Type ◽  
Selection Of

AbstractDue to its unique long-term coverage and high photometric precision, observations from the Kepler asteroseismic investigation will provide us with the possibility to sound stellar cycles in a number of solar-type stars with asteroseismology. By comparing these measurements with conventional ground-based chromospheric activity measurements we might be able to increase our understanding of the relation between the chromospheric changes and the changes in the eigenmodes.In parallel with the Kepler observations we have therefore started a programme at the Nordic Optical Telescope to observe and monitor chromospheric activity in the stars that are most likely to be selected for observations for the whole satellite mission. The ground-based observations presented here can be used both to guide the selection of the special Kepler targets and as the first step in a monitoring programme for stellar cycles. Also, the chromospheric activity measurements obtained from the ground-based observations can be compared with stellar parameters such as ages and rotation in order to improve stellar evolution models.

HYPERON PRODUCTION AND POLARIZATION WITH CLAS AND CLAS12 AT JLAB

2010 ◽  
Vol 19 (05n06) ◽  
pp. 1021-1030 ◽  
Author(s):  
◽  
SERGIO ANEFALOS PEREIRA
Keyword(s):  
Cross Sections ◽  
Resonance Problem ◽  
Future Perspectives ◽  
Hyperon Production ◽  
Preliminary Results ◽  
Spin Observables ◽  
Deuterium Target ◽  
Linearly Polarized ◽  
Baryon Resonances ◽  
Comprehensive Study

Many baryon resonances are predicted studying the channels with π, but very few established. This is the so-called "missing resonance" problem. It is important to provide data to investigate the spectrum of baryon ( N * and Δ) resonances, with the decay in KY. A comprehensive study of the electromagnetic strangeness production has been undertaken at Jefferson Lab using circularly and linearly polarized photon beam and polarized hydrogen and deuterium target. Recent results in strangeness photoproduction on protons, including cross sections and spin observables, are discussed in this paper, as well preliminary results on photoproduction on bound neutron. Also an overview of the future perspectives for the 12 GeV upgrade.

The O–C diagrams of minor planets − a new approach to modelling the rotation

1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss
Keyword(s):  
Error Analysis ◽  
Time Dependence ◽  
Theoretical Work ◽  
Minor Planet ◽  
Minor Planets ◽  
New Approach ◽  
Preliminary Results ◽  
Ccd Observations

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.

Cyclic Evolution of Sunspots: Gleaning New Results from Old Data

2000 ◽  
Vol 179 ◽  
pp. 163-165
Author(s):  
S. K. Solanki ◽  
M. Fligge ◽  
P. Pulkkinen ◽  
P. Hoyng
Keyword(s):  
Sunspot Number ◽  
Sunspot Cycle ◽  
Preliminary Results ◽  
Butterfly Diagram

AbstractThe records of sunspot number, sunspot areas and sunspot locations gathered over the centuries by various observatories are reanalysed with the aim of finding as yet undiscovered connections between the different parameters of the sunspot cycle and the butterfly diagram. Preliminary results of such interrelationships are presented.

Systematic effects in observed parallaxes

1978 ◽  
Vol 48 ◽  
pp. 31-35
Author(s):  
R. B. Hanson
Keyword(s):  
Error Estimates ◽  
Zero Point ◽  
Absolute Zero ◽  
Apparent Magnitude ◽  
Coherent System ◽  
Preliminary Results ◽  
General Catalogue ◽  
Systematic Effects ◽  
New Evidence ◽  
Right Ascension

Several outstanding problems affecting the existing parallaxes should be resolved to form a coherent system for the new General Catalogue proposed by van Altena, as well as to improve luminosity calibrations and other parallax applications. Lutz has reviewed several of these problems, such as: (A) systematic differences between observatories, (B) external error estimates, (C) the absolute zero point, and (D) systematic observational effects (in right ascension, declination, apparent magnitude, etc.). Here we explore the use of cluster and spectroscopic parallaxes, and the distributions of observed parallaxes, to bring new evidence to bear on these classic problems. Several preliminary results have been obtained.

Quantitative Measurements on the Ion Etching of TMV

1973 ◽  
Vol 31 ◽  
pp. 336-337
Author(s):  
Irwin Bendet ◽  
Nabil Rizk
Keyword(s):  
Electron Microscope ◽  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Ion Current ◽  
Beam Diameter ◽  
Ion Etching ◽  
Preliminary Results ◽  
Quantitative Measurements ◽  
Monitoring Devices

Preliminary results reported last year on the ion etching of tobacco mosaic virus indicated that the diameter of the virus decreased more rapidly at 10KV than at 5KV, perhaps reaching a constant value before disappearing completely.In order to follow the effects of ion etching on TMV more quantitatively we have designed and built a second apparatus (Fig. 1), which incorporates monitoring devices for measuring ion current and vacuum as well as accelerating voltage. In addition, the beam diameter has been increased to approximately 1 cm., so that ten electron microscope grids can be exposed to the beam simultaneously.

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