Proceedings of the Indian Academy of Sciences - Section A

Raychaudhuri, B.

doi: 10.1007/BF03045747pmid: N/A

An attempt is made in this paper to compute the value ofα for the roof material fromin situ temperature measurements of roof and ceiling surfaces and indoor ambient air below, using the Fourier Components of the periodic variations and the available classical methods of solution for the general differential equation of unidirectional heat flow through the structure. Even though the boundary conditions assumed in the solution are not strictly identical with the experimental ones the computed thermal diffusivity, underin situ conditions, can be considered accurate enough for practical purposes.

Balakrishna, S.; Narayana, G.

doi: 10.1007/BF03045748pmid: N/A

A simple porosimeter has been designed with a view to handle large volumes of samples and determine the grain volume with the help of a calibration graph. Bulk volume is determined directly from the geometric shape of the samples. The results obtained are repeatable and are found to be in good agreement with those obtained by other methods.

Venkataraman, K.; Vasudeva Murthy, A.

doi: 10.1007/BF03045749pmid: N/A

1. Anhydrous aluminium chloride reacts with phosphorus oxychloride to give a complex with a composition AlCl3.2 POCl3 which can be prepared in the form of a free flowing powder.

Sarma, B.

doi: 10.1007/BF03045750pmid: N/A

Eleven clay mineral extracts from shales and shaly sandstones equivalent to Kamthis of Triassic age, from the Somavaram (80° 55′; 16° 55′) and Chintalapudi (81° 3′; 17° 3′) areas, are studied by Differential Thermal Analysis. The presence of kaolinite group of clay minerals is indicated. The kaolinites would have formed by the erosion of thepara-gneisses and schists, which are the source rocks for the Chintalapudi sandstones, and are suggestive of deposition under continental conditions, possibly in a fluvio-lacustrine environment.