A pulse current technique was conducted in a boron-doped diamond （BDD） anode system for electrochemical waste- water treatment. Due to the strong generation and weak absorption of hydroxyl radicals on the diamond su...A pulse current technique was conducted in a boron-doped diamond （BDD） anode system for electrochemical waste- water treatment. Due to the strong generation and weak absorption of hydroxyl radicals on the diamond surface, the BDD elec- trode possesses a powerful capability of electrochemical oxidation of organic compounds, especially in the pulse current mode. The influences of pulse current parameters such as current density, pulse duty cycle, and frequency were investigated in terms of chemical oxygen demand （COD） removal, average current efficiency, and specific energy consumption. The results demon- strated that the relatively high COD removal and low specific energy consumption were obtained simultaneously only if the current density or pulse duty cycle was adjusted to a reasonable value. Increasing the frequency slightly enhanced the COD re- moval and average current efficiency. A pulse-BDD anode system showed a stronger energy saving ability than a constant-BDD anode system when the electrochemical oxidation of phenol of the two systems was compared. The results prove that the pulse current technique is more cost-effective and more suitable for a BDD anode system for real wastewater treatment. A kinetic analysis was presented to explain the above results.展开更多
To the Editor:Dermatofibrosarcoma protuberans is a type of poor to moderately differentiated tumor that accounts for 0.1%of all malignant tumors.⑴This tumor type mainly occurs in the superficial skin and the subcutan...To the Editor:Dermatofibrosarcoma protuberans is a type of poor to moderately differentiated tumor that accounts for 0.1%of all malignant tumors.⑴This tumor type mainly occurs in the superficial skin and the subcutaneous tissue of the trunk and is rare in patients with breast cancer.121 Here,we report a patient with dermatofibrosarcoma protuberans of the breast whose tumors are irregular in shape.展开更多
To the Editor:Primary pulmonary lymphoepithelioma-like carcinoma(PPLELC)is considered to be a rare type of lung cancer and is caused by long-term Epstein-Barr virus infection with clinical symptoms similar to most lun...To the Editor:Primary pulmonary lymphoepithelioma-like carcinoma(PPLELC)is considered to be a rare type of lung cancer and is caused by long-term Epstein-Barr virus infection with clinical symptoms similar to most lung cancers.During the COVID-19 pandemic,we treated a seemingly asymptomatic patient with PPLELC comorbidity who was admitted to the hospital for an acute attack of chronic rhinitis.The chest computed tomography(CT)scans showed an abnormal mass in the patient's lung.Based on this clinical case,we propose that there is a positive correlation between chronic Epstein-Barr virus-related rhinitis and PPLELC.In addition,we recommend that patients with rhinitis who are infected by the Epstein-Barr virus receive continuous antiviral therapy with regular monitoring of the viral concentration and CT scans.展开更多
基金supported by the Ph.D. Programs Foundation of the Ministry of Education of China (No. 20110006110011)the National Natural Science Foundation of China (No. 51272024)
文摘A pulse current technique was conducted in a boron-doped diamond （BDD） anode system for electrochemical waste- water treatment. Due to the strong generation and weak absorption of hydroxyl radicals on the diamond surface, the BDD elec- trode possesses a powerful capability of electrochemical oxidation of organic compounds, especially in the pulse current mode. The influences of pulse current parameters such as current density, pulse duty cycle, and frequency were investigated in terms of chemical oxygen demand （COD） removal, average current efficiency, and specific energy consumption. The results demon- strated that the relatively high COD removal and low specific energy consumption were obtained simultaneously only if the current density or pulse duty cycle was adjusted to a reasonable value. Increasing the frequency slightly enhanced the COD re- moval and average current efficiency. A pulse-BDD anode system showed a stronger energy saving ability than a constant-BDD anode system when the electrochemical oxidation of phenol of the two systems was compared. The results prove that the pulse current technique is more cost-effective and more suitable for a BDD anode system for real wastewater treatment. A kinetic analysis was presented to explain the above results.
文摘To the Editor:Dermatofibrosarcoma protuberans is a type of poor to moderately differentiated tumor that accounts for 0.1%of all malignant tumors.⑴This tumor type mainly occurs in the superficial skin and the subcutaneous tissue of the trunk and is rare in patients with breast cancer.121 Here,we report a patient with dermatofibrosarcoma protuberans of the breast whose tumors are irregular in shape.
文摘To the Editor:Primary pulmonary lymphoepithelioma-like carcinoma(PPLELC)is considered to be a rare type of lung cancer and is caused by long-term Epstein-Barr virus infection with clinical symptoms similar to most lung cancers.During the COVID-19 pandemic,we treated a seemingly asymptomatic patient with PPLELC comorbidity who was admitted to the hospital for an acute attack of chronic rhinitis.The chest computed tomography(CT)scans showed an abnormal mass in the patient's lung.Based on this clinical case,we propose that there is a positive correlation between chronic Epstein-Barr virus-related rhinitis and PPLELC.In addition,we recommend that patients with rhinitis who are infected by the Epstein-Barr virus receive continuous antiviral therapy with regular monitoring of the viral concentration and CT scans.
