Surface morphology of diffusion aluminide coatings

The surface structure and morphology of aluminide coatings can be important in their performance both in oxidation or hot corrosion resistance and in their mechanical behavior. However, little information is available on the effects of aluminide coating deposition conditions on the coating surface. A study of the effects of aluminide processing parameters on both pure nickel and a nickel-base superalloy, IN 738, revealed a systematic change in surface morphology from a rough, serrated, fine-grain surface which occurs with a high aluminum activity deposition process to a smooth coarse-grain structure for the low aluminum activity process. A systematic change in coating color was also observed for both the pure metal and the alloy with changing coating aluminum contents. Results are reported and related to the coating phases present during the deposition process.     

Radip induction of ether anaesthesia and controlled maintenacne by a combination of intravenous and inhalation administration without the risk of explosion

The induction and maintenance of anaesthesia with ether using a combined intravenous infusion and a constant low inspired concentration are discribed. Predictions from a mathematical model were checked against animal experiments. Anaesthesia occurred within 5 min. The mehtod obviates the need for explosive mixtures.     

Endoscopic removal of a dental instrument from the stomach: case report

The records of 628 patients admitted to the Joint Study of Extracranial Arterial Occlusion with transient symptoms of carotid system ischemic disease were examined to determine the accuracy of predicting disease of the extracranial internal carotid artery on the basis of clinical information alone. A patient with a history of episodes of amaurosis fugax is more likely to have a lesion of the internal carotid artery on the same side than if he were having only transient cerebral ischemic attacks. In patients with transient symptoms and a carotid bruit on the appropriate side, the incidence of an angiographically normal carotid artery was 15%. In those patients with transient symptoms and no palpable pulsation in the cervical region on the appropirate side, the incidence of an angiographically normal carotid artery was zero.     

Clinical characteristics of early cutaneous melanoma

Clinical characteristics of the primary tumor in 786 patients with superficial spreading melanoma were studied in a prospective sequential series of patients from the Melanoma Clinical Cooperative Group. The most useful features for early diagnosis were change in size and change in color, present in 71% and 55% respectively of patients with level II lesions. Increase in height of lesion correlated with more advanced disease. Ulceration and bleeding were predominantly found in advanced primary lesions and are consequently of limited use in early recognition. Awareness of the historical and clinical features of the primary tumor should result in early recognition and cure of most primary superficial spreading melanomas.