Fiber one-ended

Fiber, one-ended A fiber so short in length it appears that it only has one end. Examples include very short length milled glass fibers and asbestos fibers. 

Before the gas permeation test is carried out, the PAN hollow fiber membranes are potted at both ends to form abimdle consisting of 5-10 fibers. One end of the fiber bundle is sealed into a stainless steel tube of 5/8 in. outer diameter, while the other end is potted in an aluminium cap. Loctite E-30CL epoxy adhesive is used as a potting resin. This bimdle is then inserted in a suitable module as shown in Fig. 5.4. All... 

Alternatively, a fiber optic bundle can be used in place of the pipe. In a fiber optic bundle, a matrix of smaU (50—100 -lm) fiber optic strands are arranged such that the ordering of the strands at one end is equivalent to that on the other end. Therefore an image focused on one end with lenses is transmitted to the other end. Light is typicaUy sent down some of the fibers not used for image transmission to provide illumination. 

Influent water enters one end of the pressure vessel and is evenly distributed along the length of the vessel by a concentric distributor tube. As the water migrates out radially, some of it permeates the fibers and exits the pressure vessel via the tube sheet on the opposite end. The direction of permeate flow is from outside to inside the fibers. The concentrated solution, or reject, completes its radial flow path and leaves the vessel at the same end at which it entered. 

A hollow-fiber reverse-osmosis module consists of a shell which houses the hollow fibers (Fig. 11.3). The fibers are grouped together in a bundle with one end sealed and the other open to the atmosphere. The open ends of the fibers are potted into Ml epoxy sealing head plate after which the permeate is collected. The pressurized feed solution (denoted by the shell side fluid) flows radially from a central porous tubular distributor. As the feed solution flows around the outer side of the fibers toward the shell perimeter, the permeate solution penetrates through the fiber wall into the bore side by virtue of reverse osmosis. The permeate is collected at the open ends of the fibers. The reject solution is collected at the porous wall of the shell. 

The biberty (Fig. 10), a monomode microwave reactor for automated SPPS, was recently introduced by the CEM Corporation [153]. Although this instrument was originally developed for SPPS, it also allows for a broader scale of solid-phase applications. The solid-phase vial is equipped with a polypropylene frit and cap at one end (the entire assembly fitting into the standard 10 mb CEM reaction vessel) to allow the processing of 0.1 to 1.0 mmol quantities of resin attached substrates. An integrated fiber optic probe provides... 

Fig. 13.16a. As an atom source, a magneto-optical trap (MOT) for cold Cs-atoms was used. The fluorescence of MOT atoms around the MNF was detected by the measurement of fluorescence photons with an avalanche photodiode connected to one end of the fiber. Signals are accumulated and recorded on a PC using a photon-counting.

Formulation Requirements. In order to penetrate the mass of fiber at one end of the bundle, the formulation must have sufficiently low viscosity to move easily through the bundle completely wetting all fiber surface area. Typically, formulations of viscosity less than 8000 poises have been successful. Too low viscosity or too rapid delivery of the formulation can result in the occlusion of air and the ultimate development of voids with loss of mechanical integrity. Our process demands that formulation be delivered and partially cured to an intermediate plateau termed green state. This requires a minimum pot life of 30 minutes after blending of resin and curative. The physical chemistry of the composite membrane requires that the initial exotherm not exceed approximately 150 C. 

There exists a relationship between the ideal length of a fiber and the amount of adhesion between the matrix and the fiber. For instance, assume that only the tip, one end, of a fiber is placed in a resin (Figure 8.2, left). When the fiber is pulled, the adhesion is... 

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