based on his wave theory of aberrations in conjunction with new types of glass, coatings and manufacturing techniques has transformed the performance of all types of lenses. whilst zoom lenses can never out-perform fixed focal lengths, the differences are no longer significant in most applications....
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ballistic protection applications. such fabrics combine polyethylene fibres in a thermoplastic matrix that is capable of absorbing and dispersing high impact energy, such as energy from rifle shots. each fabric layer consists of fibre tapes cross-plied at °/ °/ °/ °. the ultra high molecular weight...
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the two flat beds can be: inclined by deg- deg with respect to one another, with a staggered arrangement of the grooves accommodating latch needles or compound needles. the two flat beds are the "front needle-bed" (indicating the needle-bed closer to the operator) and the "rear needle-bed" (indicating...