Determination of equilibrium silver sulphate concentration in the system Cu-H2SO4-CuSO4-H2O-Ag2SO4-Ag as a function of composition

1983 ◽  
Vol 13 (2) ◽  
pp. 173-176
Author(s):  
J. Hotloś ◽  
M. Jaskuła
Keyword(s):  
Sulphate Concentration ◽  
Silver Sulphate

scholarly journals Serum progesterone and oestrone sulphate concetrations for monitoring fertility in Sows

2018 ◽  
Vol 50 (4) ◽  
pp. 276
Author(s):  
A. STEFANAKIS (Α. ΣΤΕΦΑΝΑΚΗΣ) ◽  
C. M. BOSCOS (Κ. Μ. ΜΠΟΣΚΟΣ) ◽  
C. ALEXOPOULOS (Κ. ΑΛΕΞΟΠΟΥΛΟΣ) ◽  
S. C. KYRIAKIS (Σ.Κ. ΚΥΡΙΑΚΗΣ) ◽  
E. KRAMBOVITIS (Η. ΚΡΑΜΠΟΒΙΤΗΣ)
Keyword(s):  
Litter Size ◽  
Correlation Coefficients ◽  
Serum Progesterone ◽  
Small Litter ◽  
Blood Samples ◽  
Sulphate Concentration ◽  
Oestrone Sulphate ◽  
Small Litter Size ◽  
Optimal Productivity

Blood samples were taken from 161 sows the days 19-21 (serum progesterone assessments), from 306 sows on days 24-30 (serum oestrone sulphate assessments) and from 150 sows on day 20 (serum progesterone assessments) and on days 26-29 (serum oestrone sulphate assessments) after service. Actual farrowing or abortion and signs of return to oestrus were used as criteria for pregnancy and non-pregnancy, respectively. Litter size was also recorded at each farrowing. The results showed that the overall accuracy of progesterone and oestrone sulphate for predicting pregnant sows was 90.7% and 97.2%, respectively. The highest accuracy of oestrone sulphate (100%) was noticed on days 27 and 28 after service. The overrall accuracy of the combination of both progesterone and oestrone sulphate assessments to detect pregnant sows was 97% and to detect non-pregnant sows was 100%. Significant correlation coefficients between serum oestrone sulphate concentration and litter size were found on days 24,26,27, 28,29 and 30, but the highest correlation coefficient was noticed on day 28 after service (r=0.51, Ρ, 0.001). Moreover, it was also found that mean litter size was significantly higher (P <0.05). in sows with serum oestrone sulphate concentrations > 1 ng/ml compared with concentrations < 1 ng/ml from day 26 up to day 30 after service. It is concluded that serum progesterone assessment helps in the determination of the non-pregnant sows early enough for problems related to failure of fertilization to be promptly dealt with. Serum oestrone sulphate concentration on day 28 after service can be used as an indicator of conception, as a predictor of small litter size and also can help in the estimation of embryonic mortality. The combination of these two assessments, in addition to their value in pregnancy diagnosis, can be useful in identifying concurrent reproductive problems in units with sub-optimal productivity.

Determination of Salt Transport Properties of Sandstone: A Combined Experimental/Computational Approach

2015 ◽  
Vol 1125 ◽  
pp. 382-386
Author(s):  
Zbyšek Pavlík ◽  
Milena Pavlíková ◽  
Robert Černý
Keyword(s):  
Moisture Content ◽  
Water Solution ◽  
Gravimetric Method ◽  
Computational Approach ◽  
Sulphate Solution ◽  
Salt Transport ◽  
Stone Masonry ◽  
Adsorption Method ◽  
Sulphate Concentration

A combined experimental/computational approach is applied for the determination of material parameters describing the transport of sulphate solution in porous structure of sandstone. The investigated sandstone, frequently used in historical buildings on the Czech territory, is chosen as a typical representative of stone masonry materials. At first, the moisture and sulphate concentration profiles in simulated 1-D water and sulphate solution transport experiment are measured. Here, the moisture content is determined by the gravimetric method, the sulphate concentration is measured by the ion chromatography. As a penetrating medium, 1M Na2SO4 water solution is used. The sulphate binding isotherm is experimentally accessed using the adsorption method. The experimental data are subjected to an inverse analysis assuming a diffusion-advection mode of sulphate transport. Finally, the moisture diffusivity for transport of Na2SO4 water solution, and the sulphate diffusion coefficient are calculated as the functions of moisture content and sulphate concentration, respectively.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

Large-scale Motion of Solar Filaments

2000 ◽  
Vol 179 ◽  
pp. 205-208
Author(s):  
Pavel Ambrož ◽  
Alfred Schroll
Keyword(s):  
Magnetic Flux ◽  
Proper Motion ◽  
Time Scale ◽  
Large Scale ◽  
Accuracy Of Measurements ◽  
Solar Filaments ◽  
General Movement ◽  
Scale Motion ◽  
Velocity Scatter

AbstractPrecise measurements of heliographic position of solar filaments were used for determination of the proper motion of solar filaments on the time-scale of days. The filaments have a tendency to make a shaking or waving of the external structure and to make a general movement of whole filament body, coinciding with the transport of the magnetic flux in the photosphere. The velocity scatter of individual measured points is about one order higher than the accuracy of measurements.

Practical Realization of a Reference System for Earth Dynamics by Satellite Methods

1975 ◽  
Vol 26 ◽  
pp. 341-380 ◽  
Author(s):  
R. J. Anderle ◽  
M. C. Tanenbaum
Keyword(s):  
Reference Frame ◽  
Polar Motion ◽  
Pole Position ◽  
Control Points ◽  
Significant Information ◽  
Crustal Motion ◽  
Average Reference ◽  
Future Data ◽  
Existing Data

AbstractObservations of artificial earth satellites provide a means of establishing an.origin, orientation, scale and control points for a coordinate system. Neither existing data nor future data are likely to provide significant information on the .001 angle between the axis of angular momentum and axis of rotation. Existing data have provided data to about .01 accuracy on the pole position and to possibly a meter on the origin of the system and for control points. The longitude origin is essentially arbitrary. While these accuracies permit acquisition of useful data on tides and polar motion through dynamio analyses, they are inadequate for determination of crustal motion or significant improvement in polar motion. The limitations arise from gravity, drag and radiation forces on the satellites as well as from instrument errors. Improvements in laser equipment and the launch of the dense LAGEOS satellite in an orbit high enough to suppress significant gravity and drag errors will permit determination of crustal motion and more accurate, higher frequency, polar motion. However, the reference frame for the results is likely to be an average reference frame defined by the observing stations, resulting in significant corrections to be determined for effects of changes in station configuration and data losses.

Models of Thermodynamic Properties of Prominences

1979 ◽  
Vol 44 ◽  
pp. 349-355
Author(s):  
R.W. Milkey
Keyword(s):  
Thermodynamic Properties ◽  
Mass Transport ◽  
Emission Spectrum ◽  
Thermodynamic Parameters ◽  
Working Group ◽  
Physical Processes ◽  
Theoretical Concepts ◽  
Group 3 ◽  
Observational Techniques

The focus of discussion in Working Group 3 was on the Thermodynamic Properties as determined spectroscopically, including the observational techniques and the theoretical modeling of physical processes responsible for the emission spectrum. Recent advances in observational techniques and theoretical concepts make this discussion particularly timely. It is wise to remember that the determination of thermodynamic parameters is not an end in itself and that these are interesting chiefly for what they can tell us about the energetics and mass transport in prominences.

Progress in the compilation of the FK5

1978 ◽  
Vol 48 ◽  
pp. 421-432 ◽  
Author(s):  
W. Fricke ◽  
W. Gliese
Keyword(s):  
Status Report ◽  
Magnitude Range

Abstract:Presented is a status report on work on FK5 giving information on the following items: (a) the intended increase of the number of fundamental stars and their magnitude range in FK5, (b) available material for the improvement of the system, (c) methods for the determination of systematic differences, (d) the determination of equator and equinox of FK5, and (e) the elimination of the motion of the FK4 equinox.

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