The following sample pages from the book “Ground Improvment Techniques” contain chapter of electro-osmosis. This book is provided by Prof. Arun Prasad. He contacted me a year ago about including part of my research work in this book. I am looking forward to further research work on electro-osmosis from Prof. Arun Prasad’s team in IIT (BHU).Ground-Improvement-Techniques
诸如research gate这样的平台可能带来一些变数，然而整个方向会迈向何处，很难说。 此间矛盾之处在于，没有同行评审的平台，可能让论文回归论文的本质：记录、分享和交流；但是，同行评审的缺失，使得信息的可信度存疑。
peer review本身并不是问题，问题在于其他地方，如 Frank Wilczek所述。
By –Frank WilczekContinue reading “当堆砌文献成为流行的写作习惯”
Today’s news that Chang’e 5 landed on the moon and planning to bring a sample of lunar soil back, called to my memory of my time in Tsinghua.
As I remember this Chang’e mission started about 15 years ago, almost the same time that I started in Tsinghua. If you are not a soil mechanics expert, you may not be able to imagine how this mission could be linked to soil mechanics. Actually, at the very beginning of the Chang’e mission, we were involved. The first task was to estimate the response of soil to the reentry capsule when it landed as planned somewhere in Inner Mongolia. (The planned landing spot for Chang’e 5 this time is still in Inner Mongolia.) The second task was to build a test area in Beijing, modelling the soil in Inner Mongolia, so that some experiment could be carried out in Beijing instead of Inner Mongolia. During those time, discussion on lunar soil sampling project already began, it is about 15 years ago. Now, finally, we see this mission carried out.
To model soil that does not exist on the earth is difficult. Our focus is on the mechanical behaviours of soil so that to provide basis for design of sampling machine and lunar vehicle. Some of issues that need to be considered include low gravity (1/6 of earth), vacuum condition and dry condition. The issue of gravity is especially concerned, because it effects confining pressure so that effects the strength. And this issue effects design of some experiments . For example, when design a triaxial test, distribution of confining stress due to the size of soil sample is always neglected, but when the confining stress is very low, this kind of difference due to soil sample size may not be negligible.Continue reading “他们说你是去了月球。。。”