A new gas sensor system with fast response and ultra-high sensitivity has been developed based on a combination of frequency modulation spectroscopy (FMS) cavity ring-down (CRDS). The consisted two distributed feedback laser diodes (DFB-LDs) emitting at frequencies 6251.761 cm -1 (Laser-1) 6257.762 (Laser-2), respectively. portion Laser-1’s output was used by technique to lock its precisely CO ...

among various practical measures used for restriction of the ground surface settlement in such tunnels driven in soft ground, selection of an appropriate excavation method plays a significant role. in this paper, employing suggested diagram by yu & chern, corresponding values of niayesh tunnel has been inserted into the diagram. later, two excavation methods namely: central diaphragm and si...

Innovative nanocomposites consisting of [(GeTe)4nm/C1nm]10 multilayers (MLs) deposited by magnetron sputtering are integrated in phase-change memory (PCM) test devices with a “wall structure”. Scanning transmission electron microscopy (STEM) shows that ML structure, crystallized GeTe layers, is kept after integration as-fabricated and also an additional annealing the at 425°C. The RESET current...

The successful estimation of soil organic matter (SOM) and total nitrogen (TN) contents with mid-infrared (MIR) reflectance spectroscopy depends on selecting appropriate variable selection techniques multivariate methods for regression analysis. This study aimed to explore the potential combining a method spectral SOM TN using MIR spectroscopy. Five hundred ten topsoil samples were collected fr...