Plunger can

Simple manual dispensing systems designed for low-volume concrete plants depend solely on the care of the concrete plant operator in batching the proper amount of admixture into a calibration tube and discharging it into the batch. These types of dispensing equipment are used in small-scale operations where admixtures are only occasionally used. For small and occasional additions, hand-dispensing equipment may be used to measure reasonably accurate quantities. A hand-operated plunger can be used to... 

Solid-phase micro-extraction (SPME), a technique commercialised by Supelco, borrows from column extraction and headspace analysis. In this procedure, a small fibre fixed to the end of a syringe plunger can either exit from or be retracted into... 

When no peaks are observed upon injection of a sample, it is common to blame the column but there are other factors that could cause this. Is the sample actually getting into the column The syringe needle may become clogged with parts of the septum or insoluble material from the sample. Loose plungers can permit the sample to be blown back by the pressure of the carrier gas. The syringe is a precision device and should be handled with care. Those with burred or bent needles, or bent plungers should be repaired before use. 

Note The seeds must expand enough to bring the two contacts together and should be tested before use. The plunger can be lubricated with glycerin if it is too tight. 

Two-Stage" Injection Molding Machine. Instead of using a reciprocating screw to melt the plastic and to push the melt into the mold, the extruder screw may feed the molten plastic into a separate reservoir, and then a separate plunger can feed the melt into the mold. 

The best design of a pump for a pressure up to 300 lb. is the outside center-packed pump, illustrated in Fig. 18. The plunger can be watched and any cutting readily detected from the outside. Leakage can be stopped while the pump is in operation. 

From Table VII the displacement, Vp, of a single double-acting plunger can be found for a piston speed of 100 ft. per minute. To find the net displacement deduct the displacement of the rod, Vr, which if submerged at one end only, is one-half of the value given in the table. 

Semiconductor strain gauges added to the plunger can also be used to read a force-displacement profile of the impact event. 

Syringe handling Slow movement of the plunger can almost eliminate the pressure wave but results in enhanced discrimination of sample components. Rapid injection using the hot needle or solvent flush method is preferred. Autosamplers capable of high speed and reproducible injection times provide improved performance. 

The medication can be administered via gravity or a plunger can be used, if needed, but this is not the nurse s first intervention. 

The powder is poured into the die shaft and pressed using a hand press or a hydraulic press. A plunger can then be used to extrude the pellet. The pressures required to press pellets at different %TMDs is largely dependent on the size of the particles used. This is due to the consequences of the high pressures on the intactness of the particles [22], Figure 15.3 shows compression pressure for micron versus nanoscale powders required to achieve a specific %TMD. 

Syringes without plungers can also be used on Domino Blocks. To wash the resin, the washing solvent is added from a squeeze bottle into all of the syringes and then the Domino Block is connected to the evacuated waste container. This technique is particularly useful when a reagent is added, or a gas liberated, during a... 

In oil-hydraulic systems the plunger can be sealed by cast-iron piston rings, which retain their sealing qualities for years and have thus contributed to the wide-spread adoption of this drive system (see Table 23). 

Glass is generally pressed at a viscosity between 2000 and 3000 P with an applied pressure of about 100 Ib/in of article surface area. For large television panels, the total force on the plunger can exceed 20 tons. Temperature control of the molds and plunger... 

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