BACKGROUND Proliferative myositis is a rare benign tumor that is typically self-limiting and does not become malignant.It can be cured by simple resection without reported recurrence.Due to its rapid growth,hard struc...BACKGROUND Proliferative myositis is a rare benign tumor that is typically self-limiting and does not become malignant.It can be cured by simple resection without reported recurrence.Due to its rapid growth,hard structure and ill-defined borders,it can however be mistaken for malignant tumors such as sarcomas.CASE SUMMARY We investigate the case of a 64-year-old male with proliferative myositis of the abdominal wall,who was preoperatively administered a needle aspiration biopsy and given a simple excision and patch repair.We then compared it with other similar cases to determine the effectiveness of this treatment method.CONCLUSION Resection with follow-up observation has shown to be an effective treatment method for proliferative myositis.To avoid unnecessarily extended or destructive resection,a thorough and conclusive diagnosis is crucial,which requires adequate imaging and pathological knowledge.展开更多
The interfacial debonding in fiber-reinforced plastic(FRP)strengthened repair material will affect the bonding strength and lead to failure of the repair without warning.Unfortunately the interfacial damage is normall...The interfacial debonding in fiber-reinforced plastic(FRP)strengthened repair material will affect the bonding strength and lead to failure of the repair without warning.Unfortunately the interfacial damage is normally invisible and often in the form of a patch rather than a through-width crack.Therefore,a debonding patch detection technique based on fiber optic interferometry is proposed.A quasi-impulse loading is applied with a rubberhead hammer and the total elongation of a surface-mounted optical fiber along the length of the repair material is measured as a function of load position.When a debonding patch is present,the induced sudden slope or sign change on the plot of fiber integral strain v.s.load position will reveal the extent and the location of the debonded area.The results of the study indicate that the proposed technique is applicable for debonding patch detection in repaired members under various support conditions.展开更多
Advantages of polyethylene pipes over traditional steel or metal pipes have increased industry interest in the use of polyethylene(PE)pipelines for underground applications and especially in gas distribution networks....Advantages of polyethylene pipes over traditional steel or metal pipes have increased industry interest in the use of polyethylene(PE)pipelines for underground applications and especially in gas distribution networks.In this study,finite element analysis is used to calculate the stress distribution in a patch repaired defective gas pipe under internal pressure.The pipe is assumed to be buried at a depth of 125 cm.The material is assumed to be medium density PE80B,where the patch material was selected from high density polyethylene(HDPE).During the loading process,the seasonal pipe temperature changes,surcharge loads,soil column weight,and soil-pipe interaction were included in the analysis.Four types of patch arrangements were selected to repair the damaged pipe.The shape of the defect hole was deemed as circular or elliptic.With respect to elliptic defects,various minor to major diameter ratios,a/b,were selected to simulate a circular to a crack shaped defect.Based on the results,the semi-circular and saddle fusion patches decrease the peak von Mises stress in the pipe by almost the same amount.However,the minimum peak von Mises stress in the patch corresponds to the saddle fusion repair arrangement.Based on the results,with respect to a saddle fusion repair,when the shape of the defect approaches a crack,the peak von Mises stress in the pipe almost doubles and exceeds the pipe allowable stress for a working life of 50 years.With respect to higher values of a/b,the stress level in the patch repaired pipe is significantly below its limiting value for the same life expectancy.展开更多
基金Supported by Yonghua Mou’s Famous Doctor Studio,No.2020-42.
文摘BACKGROUND Proliferative myositis is a rare benign tumor that is typically self-limiting and does not become malignant.It can be cured by simple resection without reported recurrence.Due to its rapid growth,hard structure and ill-defined borders,it can however be mistaken for malignant tumors such as sarcomas.CASE SUMMARY We investigate the case of a 64-year-old male with proliferative myositis of the abdominal wall,who was preoperatively administered a needle aspiration biopsy and given a simple excision and patch repair.We then compared it with other similar cases to determine the effectiveness of this treatment method.CONCLUSION Resection with follow-up observation has shown to be an effective treatment method for proliferative myositis.To avoid unnecessarily extended or destructive resection,a thorough and conclusive diagnosis is crucial,which requires adequate imaging and pathological knowledge.
基金supported by the National Natural Science Foundation of China(No.51278156)the Basic Project of Shenzhen Science & Technology Program(No.JCYJ2017030155815876)
文摘The interfacial debonding in fiber-reinforced plastic(FRP)strengthened repair material will affect the bonding strength and lead to failure of the repair without warning.Unfortunately the interfacial damage is normally invisible and often in the form of a patch rather than a through-width crack.Therefore,a debonding patch detection technique based on fiber optic interferometry is proposed.A quasi-impulse loading is applied with a rubberhead hammer and the total elongation of a surface-mounted optical fiber along the length of the repair material is measured as a function of load position.When a debonding patch is present,the induced sudden slope or sign change on the plot of fiber integral strain v.s.load position will reveal the extent and the location of the debonded area.The results of the study indicate that the proposed technique is applicable for debonding patch detection in repaired members under various support conditions.
文摘Advantages of polyethylene pipes over traditional steel or metal pipes have increased industry interest in the use of polyethylene(PE)pipelines for underground applications and especially in gas distribution networks.In this study,finite element analysis is used to calculate the stress distribution in a patch repaired defective gas pipe under internal pressure.The pipe is assumed to be buried at a depth of 125 cm.The material is assumed to be medium density PE80B,where the patch material was selected from high density polyethylene(HDPE).During the loading process,the seasonal pipe temperature changes,surcharge loads,soil column weight,and soil-pipe interaction were included in the analysis.Four types of patch arrangements were selected to repair the damaged pipe.The shape of the defect hole was deemed as circular or elliptic.With respect to elliptic defects,various minor to major diameter ratios,a/b,were selected to simulate a circular to a crack shaped defect.Based on the results,the semi-circular and saddle fusion patches decrease the peak von Mises stress in the pipe by almost the same amount.However,the minimum peak von Mises stress in the patch corresponds to the saddle fusion repair arrangement.Based on the results,with respect to a saddle fusion repair,when the shape of the defect approaches a crack,the peak von Mises stress in the pipe almost doubles and exceeds the pipe allowable stress for a working life of 50 years.With respect to higher values of a/b,the stress level in the patch repaired pipe is significantly below its limiting value for the same life expectancy.
