The cutting burr is one of the common phenomena occurring in metal cutting.In this paper,the forming processes,main effect factors and change law of the cutting direction burr in orthogonal cutting have been studied a...The cutting burr is one of the common phenomena occurring in metal cutting.In this paper,the forming processes,main effect factors and change law of the cutting direction burr in orthogonal cutting have been studied and related theories are analyzed based on the cutting experiments.The result shows that:(1)the forming processes of cutting direction burr consist of normal cutting,flexure deformation of end surface of workpiece,plastic effect,continuous cutting and shear break separating in orthogonal cutting;(2)a new phenomenon is found that cutting direction burr is formed with the shear break separation of the chip and workpiece machined surfaces;(3)the size of cutting direction burr varies with workpiece materials,cutting parameters and geometric parameters of the cutting tool.展开更多
Objectives: To observe the analgesic effect and to analyze the related mechanisms of acupuncture anesthesia (AA) for appendectomy. Methods: A total of 41 cases of appendicitis patients (24 males and 17 females) were s...Objectives: To observe the analgesic effect and to analyze the related mechanisms of acupuncture anesthesia (AA) for appendectomy. Methods: A total of 41 cases of appendicitis patients (24 males and 17 females) were subjected into this observation. Electroacupuncture (AA, 60-100 Hz, a bearable stimulus strength) of Pishu (BL 20), Weishu (BL 21), Zhangmen (LR 13) and Wushu (GB 27) was performed beginning 30 minutes before operation. Adjuvants used were luminal (100 mg, intra muscular injection), dolantin (1 mg/kg), 0.5% procaine (1-2 mL). Results: Of the 41 cases, the successful rate was 87.80% and the excellent plus good rate was 75.61% respectively. Conclusion: Acupuncture anesthesia is applicable for appendectomy in clinic but is still to be improved further in operation.展开更多
A seven-month-old infant was admitted to our hospital with a 1-wk history of shortness of breath, dysphagia, and fever. Diagnosis of esophageal perforation follow- ing fish vertebra ingestion was made by history revie...A seven-month-old infant was admitted to our hospital with a 1-wk history of shortness of breath, dysphagia, and fever. Diagnosis of esophageal perforation follow- ing fish vertebra ingestion was made by history review, pneumomediastinum and an irregular hyperdense lesion noted in initial chest radiogram. Neck computed tomo- graphy (CT) confirmed that the foreign body located at the cricopharyngeal level and a small esophageal tra- cheal fistula was shown by esophagogram. The initial re- sponse to treatment of fish bone removal guided by pan- endoscopy and antibiotics administration was poor since pneumothorax plus empyema developed. Fortunately, the patient’s condition finally improved after decortica- tion, mediastinotomy and perforated esophagus repair. To our knowledge, this is the first case report of esopha- geal perforation due to fish bone ingestion in infancy. In addition to particular caution that has to be taken when feeding the innocent, young victim, it may indicate the importance of surgical intervention for complicated esophageal perforation in infancy.展开更多
基金Supported by National Natural Science Foundation of China (No.59775071).
文摘The cutting burr is one of the common phenomena occurring in metal cutting.In this paper,the forming processes,main effect factors and change law of the cutting direction burr in orthogonal cutting have been studied and related theories are analyzed based on the cutting experiments.The result shows that:(1)the forming processes of cutting direction burr consist of normal cutting,flexure deformation of end surface of workpiece,plastic effect,continuous cutting and shear break separating in orthogonal cutting;(2)a new phenomenon is found that cutting direction burr is formed with the shear break separation of the chip and workpiece machined surfaces;(3)the size of cutting direction burr varies with workpiece materials,cutting parameters and geometric parameters of the cutting tool.
文摘Objectives: To observe the analgesic effect and to analyze the related mechanisms of acupuncture anesthesia (AA) for appendectomy. Methods: A total of 41 cases of appendicitis patients (24 males and 17 females) were subjected into this observation. Electroacupuncture (AA, 60-100 Hz, a bearable stimulus strength) of Pishu (BL 20), Weishu (BL 21), Zhangmen (LR 13) and Wushu (GB 27) was performed beginning 30 minutes before operation. Adjuvants used were luminal (100 mg, intra muscular injection), dolantin (1 mg/kg), 0.5% procaine (1-2 mL). Results: Of the 41 cases, the successful rate was 87.80% and the excellent plus good rate was 75.61% respectively. Conclusion: Acupuncture anesthesia is applicable for appendectomy in clinic but is still to be improved further in operation.
基金Supported by grant from CGMH, Taoyuan, Taiwan, No. CMRPG 33014
文摘A seven-month-old infant was admitted to our hospital with a 1-wk history of shortness of breath, dysphagia, and fever. Diagnosis of esophageal perforation follow- ing fish vertebra ingestion was made by history review, pneumomediastinum and an irregular hyperdense lesion noted in initial chest radiogram. Neck computed tomo- graphy (CT) confirmed that the foreign body located at the cricopharyngeal level and a small esophageal tra- cheal fistula was shown by esophagogram. The initial re- sponse to treatment of fish bone removal guided by pan- endoscopy and antibiotics administration was poor since pneumothorax plus empyema developed. Fortunately, the patient’s condition finally improved after decortica- tion, mediastinotomy and perforated esophagus repair. To our knowledge, this is the first case report of esopha- geal perforation due to fish bone ingestion in infancy. In addition to particular caution that has to be taken when feeding the innocent, young victim, it may indicate the importance of surgical intervention for complicated esophageal perforation in infancy.
