Detecting Volcano‐Related Underground Mass Changes With a Quantum Gravimeter

Detecting Underground Penetration Attempts at Secure Facilities

Engineer 31 T.he protection of secure facilities such as forward operating bases (FOBs) and theater internment facilities (TIFs) is an emerging issue in light of the successful and nearly successful underground breaches at overseas bases, along our borders, and at prisons in foreign countries where suspected terrorists are held. The armed forces are now investigating sensor modalities to protec...

Underground operation at best sensitivity of the mobile LNE-SYRTE Cold Atom Gravimeter

Low noise underground environments offer conditions allowing to assess ultimate performance of high sensitivity sensors such as accelerometers, gyrometers, seismometers... Such facilities are for instance ideal for observing the tiny signals of interest for geophysical studies. Laboratoire Souterrain à Bas Bruit (LSBB) in which we have installed our cold atom gravimeter, provides such an enviro...

A cold atom pyramidal gravimeter with a single laser beam

Quantum current modeling in nano-transistors with a quantum dot

Carbon quantum dots (CQDs) serve as a new class of ‘zero dimensional’ nanomaterial’s in thecarbon class with sizes below 10 nm. As light emitting nanocrystals, QDs are assembled from semiconductormaterials, from the elements in the periodic groups of II-VI, III-V or IV-VI, mainly thanks to impacts of quantum confinement QDs have unique optical properties such as brighter, highly pho...

A Comparison of Underground Opening Support Design Methods in Jointed Rock Mass (TECHNICAL NOTE)

It is of great importance to consider long-term stability of rock mass around the openings of underground structure, during design, construction and operation of the said structures in rock. In this context, three methods namely, empirical, analytical and numerical have been applied to design and analyze the stability of underground infrastructure at the Siah Bisheh Pumping Storage Hydro-Electr...