文中提出一种级联H桥型电力电子变压器(cascaded H-bridge type power electronic transformer,CHB-PET)高频链解耦等效模型。该模型利用Ward等值先将功率模块内部节点的对外贡献转移到边界节点上,再根据相邻仿真步长间高频链端口电容...文中提出一种级联H桥型电力电子变压器(cascaded H-bridge type power electronic transformer,CHB-PET)高频链解耦等效模型。该模型利用Ward等值先将功率模块内部节点的对外贡献转移到边界节点上,再根据相邻仿真步长间高频链端口电容电压不突变的特点以历史电压值替代当前时刻电压,实现电路解耦,最后再进行一次Ward等值消去剩余节点,得到功率模块的背靠背等效电路。每个相单元中,根据CHB-PET的输入串联输出并联连接特征,将功率模块背靠背电路级联形成相单元等效电路。各相等效电路接入外部系统中,由电磁暂态解算器统一求解。最后,在PSCAD/EMTDC中搭建基于分立元件的详细模型和基于所提方法的等效模型,从仿真精度和时间效率两方面验证所提模型的正确性。展开更多
Osteoarthritis, a nonspecific inflammatory lesion, is a commonly seen joint disease. Clinically, it is mainly characterized by arthralgia, swelling, and motor impairment. Since the knee joint is the load-bearing joint...Osteoarthritis, a nonspecific inflammatory lesion, is a commonly seen joint disease. Clinically, it is mainly characterized by arthralgia, swelling, and motor impairment. Since the knee joint is the load-bearing joint of the human body, and is susceptible to trauma, gonitis tends to have the highest morbidity in the four limbs, which manifests itself arthritis of patella and femur at the early stage; narrowness or disappearance of the medial joint space at the mid stage; and damage of the cartilage accompanied with flexion deformity at the late stage. In recent years, based on the experience of Prof. Cao Yiming, the author has treated 47 cases of gonitis by combined use of Chinese drugs and acupuncture, and obtained satisfactory therapeutic results as reported in the following.展开更多
Pseudobulbar paralysis is a kind of common clinical syndromes of cerebral vascular diseases, which is manifested as dyslalia, dysphagia and choking. By several-year clinical observations, 36 cases were treated with sa...Pseudobulbar paralysis is a kind of common clinical syndromes of cerebral vascular diseases, which is manifested as dyslalia, dysphagia and choking. By several-year clinical observations, 36 cases were treated with satisfactory therapeutic effects as reported in the following.Clinical DataOf 36 in-patients, there were 24 males and 12 females, aged from 44 to 81 years, averaging 64.92 years. Of 36 cases, 24 were at the acute stage and 12 at the recovery stage. All the cases were diagnosed as cerebral vascular diseases by cranial CT scan and MRI, of which, 4 were cerebral infarction, 26 lacunar cerebral infarction, 5 cerebral hemorrhage and 1 mixed type. Of 36 cases, 15 were the first attack of wind-stroke, 15 the second attack, 5 the third attack and 1 the forth attack. There were 26 patients with hypertension among 36 cases, of which, 8 patients suffered from hypertension within 10 years, 6 for more than 10 years, 9 for more than 20 years and 3 for more than 30 years. All the 36 cases were associated with dysphagia and agreeable to Standard on Diagnosis and Evaluation of Therapeutic Effects of Wind-stroke issued by the State Scientific Committee 85-919-01-01, 1995.展开更多
文摘文中提出一种级联H桥型电力电子变压器(cascaded H-bridge type power electronic transformer,CHB-PET)高频链解耦等效模型。该模型利用Ward等值先将功率模块内部节点的对外贡献转移到边界节点上,再根据相邻仿真步长间高频链端口电容电压不突变的特点以历史电压值替代当前时刻电压,实现电路解耦,最后再进行一次Ward等值消去剩余节点,得到功率模块的背靠背等效电路。每个相单元中,根据CHB-PET的输入串联输出并联连接特征,将功率模块背靠背电路级联形成相单元等效电路。各相等效电路接入外部系统中,由电磁暂态解算器统一求解。最后,在PSCAD/EMTDC中搭建基于分立元件的详细模型和基于所提方法的等效模型,从仿真精度和时间效率两方面验证所提模型的正确性。
文摘Osteoarthritis, a nonspecific inflammatory lesion, is a commonly seen joint disease. Clinically, it is mainly characterized by arthralgia, swelling, and motor impairment. Since the knee joint is the load-bearing joint of the human body, and is susceptible to trauma, gonitis tends to have the highest morbidity in the four limbs, which manifests itself arthritis of patella and femur at the early stage; narrowness or disappearance of the medial joint space at the mid stage; and damage of the cartilage accompanied with flexion deformity at the late stage. In recent years, based on the experience of Prof. Cao Yiming, the author has treated 47 cases of gonitis by combined use of Chinese drugs and acupuncture, and obtained satisfactory therapeutic results as reported in the following.
文摘Pseudobulbar paralysis is a kind of common clinical syndromes of cerebral vascular diseases, which is manifested as dyslalia, dysphagia and choking. By several-year clinical observations, 36 cases were treated with satisfactory therapeutic effects as reported in the following.Clinical DataOf 36 in-patients, there were 24 males and 12 females, aged from 44 to 81 years, averaging 64.92 years. Of 36 cases, 24 were at the acute stage and 12 at the recovery stage. All the cases were diagnosed as cerebral vascular diseases by cranial CT scan and MRI, of which, 4 were cerebral infarction, 26 lacunar cerebral infarction, 5 cerebral hemorrhage and 1 mixed type. Of 36 cases, 15 were the first attack of wind-stroke, 15 the second attack, 5 the third attack and 1 the forth attack. There were 26 patients with hypertension among 36 cases, of which, 8 patients suffered from hypertension within 10 years, 6 for more than 10 years, 9 for more than 20 years and 3 for more than 30 years. All the 36 cases were associated with dysphagia and agreeable to Standard on Diagnosis and Evaluation of Therapeutic Effects of Wind-stroke issued by the State Scientific Committee 85-919-01-01, 1995.
