In unhairing operations, the tanner desires a dis-solution of the epidermis with a minimum breakdown of hair and corium tissues. Comparatively little is known about the chemical structure of epidermis, due to practical difficulties in obtaining relatively complete, unmodified, uncontaminated samples of this tissue. Epidermis for this work was obtained from three animals by two methods calculated to yield a minimum of modification. These methods were (1) removal at less than 10°C with dilute sodium chloride solutions, with precautions taken against bacterial action, and (2) removal by the action of distilled water at 60°C. for a period of ten minutes.
This research studied the methods and techniques that can be applied to measure the surface finish of a cylindrical part during the grinding process. The applicability, capability, and feasibility of the techniques and roughness measurement methods are the main research objectives. Through a literature survey and various technique investigations, it was established that an ultrasonic technique has the greatest promise.
"For 10 to 15 years in the cultural life of 20th-century Russia, composers found themselves in the unique position of enjoying considerable artistic freedom while receiving state funds to compose music from a contemporary Russian viewpoint. From about 1980, for the first time in 60 years, composers did not have to adhere to any Soviet ideology, nor were they hampered by any restrictions on Western influences or sacred liturgical texts. This artistic golden age of the 1980s and early 1990s ended as severe economic hardships developed."