燃气轮机进气滤后隔网腐蚀原因分析和处理

介绍了某电厂 3# 燃机的压气机因进气滤后不锈钢丝隔网散落造成压气机叶片损伤的情况和检修对策。通过对断裂钢丝进行宏观、显微及腐蚀产物的分析,确定钢丝断裂的主要原因为应力腐蚀开裂。

空盘除

珠算除法,种类不少,但历史流传下来的均是布数除法,不象乘法有的布数,有的不布数。但近年来国内珠算学者,鉴于乘法既然有空盘乘,认定除法也必存有空盘除,只是有待我们深入发掘、研究、开发罢了。理由是乘除可以互为逆运算的。而且我们知道,除法种类上有的隔位除,如:减数除,商除法,倍数除法,常数除法,两句话除法等,有的不隔位除,如:归除法,补数除法,双优除法等。由于空盘乘只是往盘上加积来运算,那么它们逆运算除法必然是只能往盘上立商和减积来运算。空盘由于是两不摆,运算速度就快了许多,因此是有推广和普及价值的是对提高我国的珠算技术水平大有好处的。

为减轻学生负担,台中、小学生假日后不考试

教育部长郭为藩要求各中小学校彻底落实“假日后不考试”的政策。今后在星期一或假日后隔天,学校均不得举行考试或安排学科测验,让学生在没有功课压力的情况下与家人欢度假期。

Treatment and prognosis of primary mediastinal seminoma

Objective: To investigate the surgical treatment and prognosis of the primary mediastinal seminoma. Methods: Three cases with primary mediastinal seminoma from 1985 were retrospectively studied. They were male, aged 23, 36 and 32 years respectively. The primary symptoms were chest pain and coughing. The chest X-ray examination revealed solid round mass in the anterior mediastinum, with the diameters varied from 3 cm to 18 cm and a smooth clear edge. The diagnosis was not clearly in all three cases, and then operation was performed. Results: There were no operative deaths and complications. The tumor was radically removed in 2 cases and palliatively removed in 1 case. The post-operative pathological diagnosis is seminoma in all three cases. Radiotherapy were performed in 4 weeks after operation. All cases have been followed up to now, with 1 cases of death and 2 cases survival. Conclusion: Primary seminoma of the mediastinum is very rare. Operation is the main treatment for the primary mediastinal seminoma. Seminoma shows a good prognosis.

鼠标能玩“空手道”

电脑操作离不开的就是键盘和鼠标。整天坐在电脑面前,你们是否体会到,长时间使用鼠标,频繁地点击、移动,手腕会很累,甚至还会得“鼠标手”!