The filtration behaviour of woven and nonwoven fabrics at different air flow rate, dust feed rate, dust loading, time intervals and dust particles has been studied. It is observed that the pressure drop increases with the increase in airflow rate for both the woven and nonwoven filters. In general, the pressure drop in case of woven filter is found to be higher than that in case of nonwoven fil...

by GARY BREWTON New registration procedures requiring students to sign up f o r s p r i n g c o u r s e s b y November 18 have been put i n t o e f f e c t t o i m p r o v e e s t i m a t e s on the size of classes. Each student is required to turn in by next Tuesday a mark-sense form signed by his advisor and listing prospective courses. He will have the option to drop and add courses without ...

In the paper, a novel three-port channel drop filter in two dimensional photonic crystals (2D PCs) with a wavelength-selective reflection micro-cavity is proposed. In the structure, two micro-cavities are used. One is used for a resonant tunneling-based channel drop filter. The other is used to realize wavelength-selective reflection feedback in the bus wave-guide, which consists of a point def...

A simple idea of the frequency transformation where each delay of the original real lowpass filter transfer function is replaced by the same allpass filter allows a lot of flexibility in manipulating the original filter to fit the required specification. The simple cases of real first-order transformations and a very few second-order ones have been suggested by Constantinides in the early 1970s...

We show that a waveguide that is normally opaque due to interaction with a drop-filter cavity can be made transparent when the drop filter is also coupled to a dipole, even when the vacuum Rabi frequency of the dipole is much less than the cavity decay rate. The condition for transparency is simply achieving large Purcell factors. We describe how this effect can be useful for designing quantum ...

We design and fabricate a compact third-order coupledresonator filter on the silicon-on-insulator platform with focused application for on-chip optical interconnects. The filter shows a large flat bandwidth (3dB 3.3nm), large FSR (approximately 18nm), more than 18dB out-of-band rejection at the drop port and more than 12 dB extinction at the through port, as well as a negligible drop loss (<0.5...

bioaerosols are the most significant risk for exposed people leads to infectious diseases. this study was aimed at evaluation of physical and microscopic characteristics and submicron particulate filtration efficiency of surgical masks used in hospitals throughout iran. five types of domestic (zist filter, elhamteb and arman masks) and imported (blosom, face masks) surgical masks were tested se...