The present article reports the application of hexamethylsilazane (HMDS) modified filter paper for ultrasensitive detection of Hg(2+), Co(2+) and Zn(2+). By chemical vapor deposition of HMDS, a highly hydrophilic filter paper was fabricated to a low wetting (hydrophobic) substrate. The water contact angle (θ) of modified paper was ∼128°, whereas scanning electron and atomic force microscopy con...

Unmanned aerial vehicles (UAVs) will become an indispensable part of future sixth-generation (6G)-based mobile networks that can provide flexible deposition, strong adaptability, and high service quality. Under the guarantee blockchain, UAVs efficient communication or computing services for ground intelligence devices promote development wireless communication. However, as number increases, iss...

A true bronchial dosimeter has been designed, consisting of four 400-mesh wire screens and a filter paper. With a face velocity of 3.3 cm s(-1) for home exposure and 4.6 cm s(-1) for mine exposure, the deposition pattern on the wire screens were found to satisfactorily match the variation of the dose conversion factor (in units of mSv WL M(-1)) with the size of radon progeny from 1 to 1000 nm. ...

introduction: the accuracy of analyzing functional mri (fmri) data is usually decreases in the presence of noise and artifact sources. a common solution in for analyzing fmri data having high noise is to use suitable preprocessing methods with the aim of data denoising. some effects of preprocessing methods on the parametric methods such as general linear model (glm) have previously been evalua...

here, we propose an add-drop and a channel drop filter based on two-dimensional photonic crystal all circular ring resonators. these structures are made of a square lattice of silicon rods with the refractive index n1=3.464 surrounded by air (with refractive index n2=1). the broadest photonic band gap occurs at the filling ratio of r/a = 0.17. two linear defect w1 waveguides couple to the ring....

Emissions of airborne particulate matter are a major cause air pollution. A numerical approach was used to establish single-filter-bag cleaning model based on the discrete phase particle deposition distribution law study effect pulse backflushing operation parameters performance specific structure dust collector. It found that increasing blowing pressure (0.2 MPa 0.6 MPa) and extending width (0...

[1] In a previous study (Hasan et al., 2006) we applied time series analysis and distributed hydrological modeling techniques to investigate the effect of hydrological processes on observed terrestrial gravity residuals. In this study we apply terrestrial gravity observations (measured in one location) to constrain simple hydrological models in a catchment around the gravimeter. A superconducti...

We describe studies of the interaction of ≅400ns duration, multiline (2.6-3) μm HF laser with enamel tissue. The etch rate experiment showed an ablation threshold fluence of 47 Jcm but using the dispersion theory for optical coefficients of n and k for enamel at dominant laser lines, this value reduced to ≅25 Jcm making it more comparable with other investigations. The main mechanism of enamel ...

The present study demonstrates accumulation and distribution of heavy metals (Fe, Cr, Cd, Pb & Cu) in cultivated soil and vegetables, and its potential implication to health risk via consumption of contaminated vegetables. Deposition of atmospheric metals results significant enrichment of metal contents (Pb=1.6, Cu=1.4 & Cd=15.9) in cultivated soil. Elevated metal content in soil facilitate hig...