References—continued periodicals

A continuing periodic change in a displacement with respect to a fixed reference. The motion will repeat after a certain interval of time. Vibration analysis monitors the noise or vibrations generated by plant machinery or systems to determine their actual operating condition. The normal monitoring range for vibration analysis is from less than 1 to 20,000 Hertz. 

STEL Short Term Exposure Limit (STEL) refers to a safe level of exposure (see also TLV) from inhalation tor a continuous period of time that is short (by OSHA standards either a 15 minutes or 5 minutes of continuous exposure). The concentration established by the STEL (usually in ppm) should not be exceeded during that period of exposure, and further, the time limit of continuous exposure should not be exceeded, else there is a health risk. 

Quality control includes such procedures as checking for proper identification of samples, checking reagent lot numbers and utilities, etc. Control charts should be maintained for both equipment as well as analytical procedure by measurement of QC samples [16]. These are typical samples of sufficient stability and quantity to be used for analytical purposes over a continued period of time. For routine measurement, the number of QC samples should be at least one of twenty samples for analysis, and for more complicated analytical procedures the number of QC samples occasionally increases to 1 1. For infrequent analytical procedures, e.g., in research, a validation of the method should be performed at all runs, and this should also include the use of certified reference materials (CRM) when suitable ones are available. 

The variations of the maximum temperature (T ax) with peak power were reported where each curve was related to a pulse period. All curves were issued from the same point, corresponding to the reference continuous wave, that is, power 30 W with Tmax 70 °C. Starting from this point, T ax always increases with pulse power (Figure 42). Thus, it was concluded that the energy transfer by pulse microwaves is more efficient than by continuous irradiation, and microwave-cured polyurethane films were very much harder than oven-cured materials. 

Short-term repeated exposures involve consecutive daily exposures to the test chemical which are continued over a period of a few days to a few weeks but usually not more than 5% of the lifespan of the animal. These test conditions are sometimes referred to as subacute, but this is a misleading term which should be avoided in order to prevent confusion between single and repetitive exposure toxicity. 

Follow- Up. Even after the system is deHvered, additional work is usually needed. In conventional software engineering this is viewed as software maintenance or upgrade. It is referred to here as foUow-up to emphasize that the process of knowledge-base refinement that begias ia the prototypiag stage can continue even after the system is commissioned. The need for additional detail may come to light only after the appHcation has been ia use for some period of time. The time required to implement such enhancements should be takea iato accouat. 

The result was of course Volume 2 and the birth of a series. The next volume, 3, was produced at the time we again felt the need to update our narrative a semidecenial period was settled upon since it seemed to represent the best compromise between currency and a sufficient body of material to merit treatment in a monograph. The volume at hand continues the series it covers the chemistry of those compounds which have been granted a United States Adopted Name (USAN) in the five years between 1983 and 1987. The bulk of the references thus fall in the 1980s the reader will note occasional much older references. We suppose that those represent compounds which were synthesized many years ago and set on the shelf at that time they were then revived for clinical development for one reason or another and a USAN applied for. 

FPN No. 1) As a guide in determining when flammable gases are present continuously, for long periods, or under normal conditions, refer to. Recommended Practice for Classification of Locations for Electrical Installations of Petroleum Facilities, API RP 500-1991, Electrical Apparatus for Explosive Gas Atmospheres, Classifications of Hazardous Areas, lEC 79-10 and. Institute of Petroleum Area Classification Code for Petroleum Installations, IP 15. 

As illustrated in Fig. 1, the activated carbon displays the highest conversion and selectivity among all the catalysts during the initial reaction period, however, its catalytic activity continues to decrease during the reaction, which is probably caused by coke deposition in the micropores. By contrast, the reaction over the CNF composites treated in air and HN03 can reach a pseudo-steady state after about 200 min. Similiar transient state is also observed on the CNFs and the untreated composite. Table 3 collects the kinetic results after 300 min on stream over catalysts tested for the ODE, in which the activity is referred to the BET surface area. The air-treated composite gives the highest conversion and styrene selectivity at steady state. 

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