With the rise of fourth industrial revolution, traditional methods analyzing investment have been transformed into intelligent under big data and Internet Things. This has created a new approach to solving practical engineering problems. paper examines formation evolution application inversion theory in tunnel underground engineering, summarizing research progress using analysis identify three ...

Based on the research from 2000 to 2020 in China Knowledge Resource Database (CNKI) as data source, with help of CiteSpace V and VOSviewer digital technology, a knowledge map is drawn number articles, issuing organizations keywords underground space landscape China. Visualization technology shows relationship between structure, evolution, cooperation research, intuitively hotspots frontier dyna...

A problem is defined to be exactly solvable if its solution can be obtained by solving a sequence of polynomials using radicals. Therefore, if a problem is not exactly solvable, then we have to use approximation schemes for solving the problem. It has been proved that the shortest network problem in space is not exactly solvable even if the network spans only four points and even if the topolog...

a Graduate Aeronautical Laboratories and Department of Mechanical and Civil Engineering, Division of Engineering and Applied Sciences, California Institute of Technology, Pasadena, CA 91125, USA b NJU-ECE Institute for Underground Space and Geo-environment, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China, 210093 c Ecole Polytechnique Fédérale de Lausanne (EPFL), Sch...

We review how some open issues on Astro Particle physics can be studied by space born experiments in a complementary way to what is being done at underground and accelerators facilities 1 At the beginning it was Astro Particle This figure shows the conference photo taken at the 1939 Chicago Symposium on Cosmic Rays. Among the partecipants we find a quite exceptional group of physicists: Kohlost...

The Tokyo group has performed the first underground dark matter search experiment from 2001 through 2002 at Kamioka Observatory(2700m.w.e). The detector is eight LiF bolometers with a total mass of 168g and aims for the direct detection of WIMPs via spin-dependent interaction. With an exposure of 4.1 kg·days, we derived the limits in the ap−an (WIMP-nucleon couplings) plane and excluded a large...

Underground displacement monitoring is a key means to monitor and evaluate geological disasters and geotechnical projects. There exist few practical instruments able to monitor subsurface horizontal and vertical displacements simultaneously due to monitoring invisibility and complexity. A novel underground displacement 3D measuring sensor had been proposed in our previous studies, and great eff...