Studies in Contemporary Arabic Literature

1928 ◽  
Vol 4 (4) ◽  
pp. 745-759
Author(s):  
H. A. K. Gibb
Keyword(s):  
Economic History ◽  
Arabic Literature ◽  
Accurate Information ◽  
History Of

For some time past the writer has been endeavouring to collect material for the writing of an Economic History of Persia from the earliest times to the present. He has found himself greatly handicapped by the lack of accurate information respecting the earlier epochs of Persian history, and his researches in this direction are by no means complete.

Taxation in Persia

1928 ◽  
Vol 4 (4) ◽  
pp. 723-743 ◽  
Author(s):  
Mostafa Khan Fateh
Keyword(s):  
Economic History ◽  
Accurate Information ◽  
History Of

For some time past the writer has been endeavouring to collect material for the writing of an Economic History of Persia from the earliest times to the present. He has found himself greatly handicapped by the lack of accurate information respecting the earlier epochs of Persian history, and his researches in this direction are by no means complete.

Applications of SEM/EDXA in cement clinker investigation

1990 ◽  
Vol 48 (4) ◽  
pp. 870-871
Author(s):  
Arezki Tagnit-Hamou ◽  
Shondeep L. Sarkar
Keyword(s):  
Mineralogical Composition ◽  
Physicochemical Characteristics ◽  
Cement Clinker ◽  
Accurate Information ◽  
Phase Identification ◽  
History Of ◽  
Bulk Chemical ◽  
Resolution Imaging ◽  
Proven Method ◽  
Instantaneous Chemical

All the desired properties of cement primarily depend on the physicochemical characteristics of clinker from which the cement is produced. The mineralogical composition of the clinker forms the most important parameter influencing these properties.Optical microscopy provides reasonably accurate information pertaining to the thermal history of the clinker, while XRDA still remains the proven method of phase identification, and bulk chemical composition of the clinker can be readily obtained from XRFA. Nevertheless, all these microanalytical techniques are somewhat limited in their applications, and SEM/EDXA combination fills this gap uniquely by virtue of its high resolution imaging capability and possibility of instantaneous chemical analysis of individual phases.Inhomogeneities and impurities in the raw meal, influence of kiln conditions such as sintering and cooling rate being directly related to the microstructure can be effectively determined by SEM/EDXA. In addition, several physical characteristics of cement, such as rhcology, grindability and hydraulicity also depend on the clinker microstructure.

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