โ Scribed by B. Andronopoulos
No coin nor oath required. For personal study only.
A case of the formation of underground cavities to depths of some metres in loose sandy Quaternary sediments is described and the factors controlling their appearance and evolution are discussed. Special attention is given to the role of underground erosion, through the circulation of water, and to the importance of grain-size analysis of the sandy soil, as well as to the presence of slightly differentiated soil material (silty sand or clayey sand) distinguished in thin intercalations. This material, with only slightly increased cohesion, has the function of a roofing material in the mechanism of cavity formation.
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A rotary kiln reactor was evaluated for thermal recovery of oil from Utah oil sands. A series of continuous-flow pyrolysis experiments was conducted. Process variables investigated included temperature (748-848 K), solids retention time ( 10 27 min ) and sweep gas flow rate ( 1.27-2.83 rn? h-' ). Th
Although the histology of the suprarenal is well known to every investigator, a specimen was recently obtained which showed a striking deviation from the usual structure. Upon microscopic examination . of sections of a monkey's suprarenal, there were definite and unmistakable evidences of bone forma
## Abstract To investigate the possible causal association between squamousโcell carcinomas of the oral cavity and use of toombak, we retrospectively compared the history of use of this substance in 375 patients with squamousโcell carcinomas of the lip, buccal cavity and floor of mouth, and 271 pat