Glass fiber/bamboo fiber hybrid BMC laminates were fabricated by compression molding, and their physico-mechanical properties were investigated. To improve their properties, many factors (constituent's ratio, process conditions, bamboo fiber content) were varied. The composite material reinforced with 25 wt% hybrid fibers (25% bamboo and 75% glass fibers) showed better physico-mechanical properties (tensile strength: 37.0 MPa, flexural strength: 140 MPa, impact strength: 32 kJ/m 2 ) than other combinations.
As commonly known, ozone is a highly effective disinfectant for both aqueous and gaseous media. It works through oxidation. Dissolved ozone causes the increases of the redox potential ORP of water. During the ozonenation process, the time-dependent redox potential ORP of water depends strongly on the density of microbes in it. By analyzing the time-dependent redox potential, it is possible to measure and calculate the parameters such as the oxidizing rate, the maximal redox potential ORP max etc. of the ozonated water. These parameters of water reflect the microbiological pollution level of water. Ozonated water having a certain ORP level obtains disinfecting ability. Bacteriological analysis of the water samples after ozonation show that total coliform and E. coli bacteria were fully removed after a few minutes at ORP of 800 mV.
The use of graft copolymer of maleic anhydride polypropylene (MAPP) as a coupling agent in jute-polypropylene composites improved the mechanical properties of the composites. The scanning electron microscope (SEM) observations for fractured surfaces of unmodified and modified jute-polypropylene composites confirmed that the increase in performance was due to an increase of fiber-matrix adhesion. Jute and glass fibers were hybridized by ply-by-ply and skin-core structures, here glass and jute fibers were used as the skin and core layers, respectively. The test results show that the hybrid composites have superior mechanical properties. Especially, the impact strength increases significantly from 13.2 kJ/m 2 to 38.9 kJ/m 2 , which is 190% higher than that of a jute fiber reinforced composite.
Ozone (trioxygen) shows a lack of stability and quickly breaks down to dioxygen, meaning that ozone in any way can not be stored. It is therefore necessary to produce ozone on site where it is used. This leads to the idea of having an ozone generator with high efficiency. Ozone generator is an electrical device to convert oxygen as feed gas into ozone. Besides electrical parameters, feed gas plays an important role for ozone output. Feed gas for an ozone generator may be ambient air, dry air or oxygen rich gas. The influence of air humidity, oxygen concentration, flow rates of feed gas and their effects on ozone output of the corona discharge ozone generator have been investigated. For small-scale ozone production (i.e. one hundred grams per hour or less), using oxygen produced by pressure swing adsorption method (PSA) is considered to be a reasonable solution. The authors intend to connect the studies with the practical reality of using low-powered ozone generators in tropical area with high humidity condition.
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