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CN103230707A Special film non woven fabric for PM2.5

The invention relates to a special film non woven fabric for a PM2.5 purifying mouth mask. The special film non woven fabric comprises two layers of nonwoven fabrics, and a layer of polytetrafluoroethylene microporous film is also arranged between the two layers of nonwoven fabrics. The preparation method comprises the following stepsplacing the polytetrafluoroethylene microporous film

Wireless Communication in Underground MinesRFID based

The wireless communication systems used on surface cannot be applied strhtaway in underground mines due to high attenuation of radio waves in underground strata, besides presence of inflammable gases and hazardous environment. Nonsymmetric mine topology, uneven mine structure, complex geological structures, and v vi Preface

Netherlands Oosterhout

Netherlands Oosterhout . Gennevilliers France ; Ralls County Missouri ; Todd County South Dakota ; Washington County Oregon

Netherlands Oosterhout

Netherlands Oosterhout . Gennevilliers France ; Ralls County Missouri ; Todd County South Dakota ; Washington County Oregon

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Full text of 'Asia Pacific Fire 2006 ' Internet Archive

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high dust suppression efficiency GB 2626 2006 facemask China