Air quality control has become increasingly important in many industrial areas. Glass fiber filter paper is widely used for the collection of airborne particulate matter. Since glass fiber is fragile, fiber dispersion is believed to be important for controlling filter paper properties. In this paper, the impact of fiber dispersion on filtration performance and tensile properties was studied. Tw...

We have demonstrated the Šolc-type wavelength filters in a 52mm long periodically poled Ti diffused lithium niobate channel waveguide which has a domain period of 16.6μm. At room temperature, the center wavelength and the full-width at half maximum of the filter were about 1272.49nm and 0.23nm, respectively. The nearest side-lobe is about 7dB. New structure of optical add/drop multiplexer (OADM...

in this paper, a new design of optical channel drop filter based on two- dimensional photonic crystal ring resonators with triangular lattice is proposed. the rods of this structure is silicon with the refractive index nsi=3.46 and the surrounding environment is air with the refractive index of nair=1.the widest photonic band gap obtains for the filling ratio of r/a = 0.2. the filter’s transmis...

A granular substrate used as a support for three-way catalyzed (TWC) solid-particle membrane filter was investigated through numerical simulation. The proposed could reduce the amount of required catalyst material by 39% and lower pressure drop 33%, compared to conventional filter, while achieving almost 100% soot-filtration. Moreover, TWC porous particles, which are designed introduce fluid fl...

The procedure previously described (Zwarenstein, 1949) has been modified as follows. A small knife-point (about 5 mg.) of solid o-tolidine hydrochloride is added to 5 drops of urine in a test-tube and thoroughly mixed. A drop of the mixture is placed on a small piece of Whatman No. 1 filter paper (about 17 mm. square) on a white porcelain tile. The drop is allowed to soak into the paper and one...