Determination of quartz content for Indian coals using an FTIR technique

2010 ◽  
Vol 81 (1) ◽  
pp. 73-78 ◽  
Author(s):  
A.K. Bandopadhyay
Keyword(s):  
Quartz Content ◽  
Ftir Technique ◽  
Indian Coals

DETERMINATION OF QUARTZ CONTENT AND CRYSTALLINITY INDEX FROM LOESS SAMPLES

2013 ◽  
Vol 32 (5) ◽  
pp. 131-135 ◽  
Author(s):  
Jianbo ZHAO ◽  
Hongyun CHEN ◽  
Yougui SONG ◽  
Youbin SUN
Keyword(s):  
Crystallinity Index ◽  
Quartz Content

Measuring Abrasiveness of Solid Fuels and Other Materials by a Radiochemical Method

1968 ◽  
Vol 90 (2) ◽  
pp. 186-192 ◽  
Author(s):  
C. W. Goddard ◽  
A. F. Duzy
Keyword(s):  
Radioactive Tracer ◽  
Solid Fuels ◽  
Laboratory Model ◽  
Quartz Content ◽  
Radioactive Tracer Technique ◽  
Radiochemical Method ◽  
Wear Rates ◽  
Actual Field ◽  
Grinding Machine

A new method for predicting pulverizer grinding element wear has been developed. This paper describes a laboratory model, ball-and-race, grinding machine, and a radioactive tracer technique used to determine the relative abrasiveness of solid fuels. A procedure for determination of the quartz content of coals was developed, and its relationship to abrasiveness is discussed. Results of testing the abrasiveness of numerous coals and some materials other than coal are presented. A comparison of laboratory abrasion results with actual field wear data is given. Included is a method of application of the experimental wear data to design considerations for new units and also in anticipating wear rates of milling equipment in use.

Quantitative determination of the quartz content of respirable dust by infrared spectrophotometry

1988 ◽  
Vol 63 (1-2) ◽  
pp. 109-113
Author(s):  
J. Hlavay ◽  
L. Antal ◽  
I. Vassányi ◽  
J. Kárpáti
Keyword(s):  
Quantitative Determination ◽  
Respirable Dust ◽  
Infrared Spectrophotometry ◽  
Quartz Content

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).

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