Rujun Chen

4 Questions 29 Answers 0 Followers

Questions related from Rujun Chen

Is it possible for spectral induced polarization exploration with depth of exploration reaching 3000 ~ 5000 m?

Electromagnetic coupling is a major problem for spectral induced polarization (SIP) when the requirement of exploration depth is > 1000 m. But I find that SIP is very useful in mineral...

09 November 2015 4,065 3 View

How can I keep a low-noise operational amplifier in stable condition?

I find many strange problems in using ultra-low noise operational amplifier. It's very difficult to keep it in stable condition. The power supply is carefully designed and optimized. And...

27 June 2015 8,697 10 View

How might I detect city road cavities using geophysical method?

There are many caves in city's road in China. 277 cavities were found in Beijing from 2007-2009. 80% of caves happened at depth between 0 - 5m. 20% of caves happened at depth between 5 ~ 6 m. Many...

22 June 2015 7,939 54 View

What is the difference between ERT and TEM for shallow depth investigation?

I am wondering about the difference between ERT and TEM for shallow depth investigation. It seems that TEM is a very fast and easy way to find a conductor if a mobile array is applied. It may be...

09 June 2015 2,863 11 View