摘要:
An overhang bracket has a top member, a side member and a diagonal member. The side and top member may be connected together through a removable connecter. A guardrail post holder allows a guardrail post to be installed at a variety of angles to the top member. Rotating the side member causes the diagonal member to translate up or down the side member. A side member locator extends upwards from the overhang bracket to indicate the location of the side member. A tie rod holder holds a tie rod in an offset position relative to the side member. The side member locator may extend upwards through further parts of the shoring system or bridge overhang structure, for example a floor of a concrete form or rebar. A worker may adjust the overhang bracket in place from a standing position on a supporting structure or the floor of the form.
摘要:
Identification of microorganisms based on the sequences of their 5S, 23S and particularly 16S ribosomal RNAs is growing in utility as the database of known ribosomal RNA sequences expands. Experimental identification is usually based on matching the experimentally-determined sequence of an organisms rRNA to a previously-determined sequence in the databank, or hybridization of the organisms rRNA or encoding rDNA to an oligonucleotide probe specific for an organism anticipated to be present in the sample. Here we propose the identification of microorganisms based on the overall composition (not sequence or hybridization propensity) of characteristic molecules derived from their rRNA or rDNA sequences by enzymatic cleavage or localized amplification. Ribonuclease T1 fragments of rRNA composition determination by mass spectrometry are especially favored. The characteristic molecules used can be chosen to be “compositional signatures” whose presence/absence is known to be associated with particular groups of organisms.
摘要:
Metal strip is continuously produced by compacting metal powder to form a green strip, feeding the green strip to a sinter furnace and supporting the strip on a gaseous cushion as it is transported through the furnace, the strip transport being controlled to maintain the tensile stress applied to the strip as it passes through the furnace substantially zero. The strip may be fed through the furnace by means of pinch rolls located at entry to and exit from the furnace, the respective speeds of rotation of the pinch rolls being interrelated to accommodate shrinkage of the strip as it passes through the furnace.