Relationship between the sodium oxide activity of ceramic Na-(β + β″)-alumina and the sodium activity in the ambience of the material

2003 ◽  
Vol 94 (9) ◽  
pp. 962-966 ◽  
Author(s):  
H. Näfe
Keyword(s):  
Sodium Oxide ◽  
Sodium Activity

Mutual solid-solid interaction between CuO and sodium oxide-doped alumina

1989 ◽  
Vol 141 ◽  
pp. 195-203 ◽  
Author(s):  
G.A. El-Shobaky ◽  
Th. El-Nabarawy ◽  
G.A. Fagal ◽  
N.H. Amin
Keyword(s):  
Sodium Oxide

The System Sodium Oxide-Silica

1930 ◽  
Vol 34 (7) ◽  
pp. 1583-1598 ◽  
Author(s):  
F. C. Kracek
Keyword(s):  
Sodium Oxide ◽  
System Sodium

Effect of sodium oxide on the morphology and basicity of alumina

1995 ◽  
Vol 131 (2) ◽  
pp. 323-334 ◽  
Author(s):  
V.A. Ivanov ◽  
A. Piéplu ◽  
J.C. Lavalley ◽  
P. Nortier
Keyword(s):  
Sodium Oxide

scholarly journals Top soil salinity prediction in South-Western part of Urmia Lake with ground water data

2014 ◽  
Vol 4 (1) ◽  
pp. 57-63 ◽  
Author(s):  
N Hamzehpour ◽  
MK Eghbal ◽  
P Bogaert ◽  
N Toomanian
Keyword(s):  
Water Quality ◽  
Soil Salinity ◽  
Activity Ratio ◽  
Underground Water ◽  
Soil Samples ◽  
Urmia Lake ◽  
Quality Data ◽  
Agricultural Lands ◽  
Sodium Activity ◽  
Top Soil

Drying of Urmia Lake in the north-west of Iran threatens all the agricultural lands around the Lake. Therefore, soil salinity appears to be the major threat to the agricultural lands in the area. The aim of the present study was to investigate the spatial variation of top soil salinity by taking into account of underground water quality data as secondary information. The research was performed on a grid of 500 m in an area of 5000 ha. Soil samples were gathered during the autumn of 2009 and were repeated in the spring of 2010. Electrical conductivity of soil samples was measured in a 1:2.5 soil to water suspension. Then covariance functions were build for each data set and soil salinity prediction were done on a grid of 100 m using kriging estimator with taking into account the mean variation. Afterwards sodium activity ratio derived from underground water quality database was used as covariate to develop cross-semivarograms in prediction of top soil salinity using cokriging method. Results demonstrated that soil salinity varied from values lower than 0.5 to more than 35 dSm-1 as a function of distance to the Lake. Cross-validating the results from salinity predictions using only kriging estimator to that of cokriging with sodium activity ratio data revealed that kriging offered better estimations with ME of 0.04 for autumn 2009 and -0.12 for spring 2010. Cokriging estimator had more smoother and diffused boundaries than that of kriging and resulted in more bias estimations (ME= -0.11 and -0.21 for first and second data sets). Although kriging method had better performance in top soil salinity prediction, but cokring method resulted in smoother boundaries and reduced the negative effects of mean variation in the area. DOI: http://dx.doi.org/10.3329/ijarit.v4i1.21093 Int. J. Agril. Res. Innov. & Tech. 4 (1): 57-63, June, 2014

scholarly journals Effect of Sodium Oxide and Sodium Fluoride in Gadolinium Phosphate Glasses Doped with Eu2O3 Content

2020 ◽  
Vol 1428 ◽  
pp. 012029
Author(s):  
S. Ravangvong ◽  
R. Rajaramakrishna ◽  
N. Chanthima ◽  
N. Sangwaranatee ◽  
J. Kaewkhao
Keyword(s):  
Sodium Fluoride ◽  
Phosphate Glasses ◽  
Sodium Oxide
Sign in / Sign up

Export Citation Format

Share Document