Sample Container Cord

Lower the unpreserved sample containers one by one into the water without disturbing bottom sediment. Direct the necks upstream and away from yourself, if you are in the water. If sampling from a bridge, tie a length of the nylon cord around the container s neck and lower the container into the water. Fill containers to the neck and cap them. 

In this test the adhesion of the steel cord and rubber is tested. The test is a tensile one, performed on a 100 mm embedded length of cord, in a sample containing five cords. Fig. 21.3. 

Figure 6.13. Experimental arrangement of the hot-explosive compaction method for the preparation of consolidated Ni-Al alloys (after Kecskes etal. 2004). (a) Precursor powder sample inside a steel-tube container placed in, (b) an asbestos thermal insulation sheet (c) a concentric card-box filled with the powdered explosive (80% NH4NO3 + 20% TNT) (d) threaded steel plugs serving as contacts for the preliminary heating and to be lifted off just before detonating the explosive (e) detonating cords.

The blood-brain barrier foils most efforts to use the blood to measure the brain s chemistry, but researchers can get aroimd this obstacle by sampling cerebrospinal fluid (CSF). CSF is the fluid that circulates in the meninges of the brain and spinal cord and keeps the delicate tissues from getting rattled around and damaged in their hard, bony container. The brain makes CSF from blood, and certain metabolites get mixed in. One of these metabolites is 5-hydroxyindole acetaldehyde (5-FIIAA), a major metabolite of serotonin. Researchers who carefully puncture the meninges and extract a sample are rewarded with information concerning serotonin levels in the person s brain, as described below. 

If the pH of other sample solutions is to be measured, repeat the procedure in the previous paragraph. If more than a couple minutes will elapse before the next measurement, immerse the electrodes in distilled water. At the end of the laboratory period, be sure that the function knob is on STANDBY, disconnect the line cord, rinse the electrodes thoroughly with distilled water, and replace the protective cap or vial containing fresh distilled water. 

To avoid exposure to microwaves, ovens should never be operated with doors open. Wires and other objects should not be placed between the sealing surface and the door on the oven s front face. The sealing surfaces must be kept absolutely clean. To avoid electrical hazards, the oven must be grounded. If use of an extension cord is necessary, only a three-wire cord with a rating equal to or greater than that for the oven should be used. To reduce the risk of fire in the oven, samples must not be overheated. The oven must be closely watched when combustible materials are in it. Metal containers or metal-containing objects (e.g., stir bars) should not be used in the microwave, because they can cause arcing. 

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