Implementation of high resolution passive THz cameras operated at cryogenic temperatures of a few Kelvin benefits from a large number of pixels. At present, building a cryogenic multiplexed read-out circuit represents a challenging task. Here we propose and demonstrate broadband niobium-based tunnel junction bolometers operating in equilibrium regime at 4 K, and read out with a room temperature...

This study correlated lung cancer (LC) mortality with statistical data obtained from government public databases. In order to asses a relationship between LC deaths and radon accumulation in dwellings, indoor radon concentrations were measured with passive detectors randomly distributed in Chihuahua City. Kriging (K) and Inverse-Distance Weighting (IDW) spatial interpolations were carried out. ...

Groundwater radon levels of 83 Bq/L (2240 PC&) generated indoor radon levels >3300 Bq/m3 (89 pCi/L) at a commercial fish hatchery. Passive and active mitigation strategies to reduce the waterborne radon levels included a packed column, a waterfall through perforated grates, surface aeration, and bottom bubblers. Though waterborne co~centrations were reduced up to 83% using a combination of miti...

The object of visual odometry is the computation of the path of a rover from onboard passive vision data only. The approach presented here relies on the accumulation of ego-motion estimates obtained by stereo vision and bundle adjustment of tracked feature points. We also propose a new feature detector/descriptor, which is a simplified and faster form of other well known descriptors (SURF). For...

We propose a novel quantum nonlinear interferometer design that incorporates passive PT symmetric coupler sandwiched between two sections where signal-idler photon pairs are generated. The PT-symmetry enables efficient coupling of the longer-wavelength idler photons and facilitates sensing losses in second waveguide exposed to analyte under investigation, whose absorption can be inferred by mea...

In this paper a general first-order statistical framework is established for passive multi-channel detection and localization of an unknown radiated signal. This signal written in terms finite basis expansion, the map between these coefficients measured data on sensor channel that might be known, partially or except dimension subspace. The noise at each assumed to Gaussian white; variances may ...

We theoretically investigate the spectral and localization properties of two-dimensional (2D) deterministic aperiodic (DA) arrays of photonic nanopillars characterized by singular continuous (Thue-Morse sequence) and absolutely continuous (Rudin-Shapiro sequence) Fourier spectra. A rigorous and efficient numerical technique based on the 2D Generalized Multiparticle Mie Theory is used to study t...