耸动的数字和结论是怎样得出的     

陈力丹 《新闻与写作》2011,(11)

康菲公司管理的渤海蓬莱19-3油田平台溢油事故,是今年9月以来我国传媒报道的焦点事件之一.传媒积极参与环保问题的监督是很好的现象,但对事故的报道要秉持实事求是的科学态度.9月16日中国青年报的访问报道《溢油事件敲响渤海生态最后的警钟》,表达了当事记者对环境问题的深切关注,然而其中采访中国环境科学院研究员赵章元的一段,因为数字明显的差误而引起我的注意,这段话全文如下:  相似文献   

Effect of suction change on water content and total volume of an expansive clay   总被引：2，自引：0，他引：2  

ZHAN Liang-tong CHEN Ping NG C.W.W. 《浙江大学学报(A卷英文版)》2007,8(5):699-706

A laboratory study was carried out on both natural and compacted specimens to investigate the complex soil-water interaction in an unsaturated expansive clay. The laboratory study includes the measurement of soil-water characteristic curves, 1D free swelling tests, measurement of swelling pressure and shrinkage tests. The test results revealed that the air-entry value of the natural specimen was quite low due to cracks and fissures present. The hydraulic hysteresis of the natural specimen was relatively insignificant as compared with the compacted specimen. Within a suction range 0 to 500 kPa, a bilinear relationship between free swelling strain (or swelling pressure) and initial soil suction was observed for both the natural and compacted specimens. As a result of over-consolidation and secondary structures such as cementation and cracks, the natural specimens exhibited significant lower swelling (or swelling pressure) than the compacted specimen. The change of matric suction exerts a more significant effect on the water phase than on the soil skeleton for this expansive clay.  相似文献   

某型飞机压力加油系统计算及验证     

陈正举  谭雪花 《中国科技信息》2015,(2):26-27

根据某型民用飞机燃油系统布局特点,结合压力加油管路流速要求,计算压力加油导管管径,并采用流量模数法验证加油时间及管路流速,证明压力加油导管管径计算值的合理性。  相似文献   

生物声纳技术有望让机器人产生“视觉”     

《发明与创新》2010,(7):31-31

海洋或许是地球上最神秘莫测的地方,而现在科学家终于计算出它到底有多深,总共有多少水。据美国《生活科学》网站报道,科学家利用卫星测量技术为上述两个问题提供了答案——3682．2米的平均深度和13．32亿立方千米的总容积。  相似文献