Tests single-stage

In single-stage tests, the specimen is loaded to break in a medium. The time of crack initiation and the time of fracture are visually detected and evaluated [263]. 

During single-stage tests with simultaneous measurement, a characteristic property is recorded during loading in a medium [263]. 

The series of standards ISO 22088 [265] compiles the methods valid until 2006 and includes two new methods. The standards ISO 4599, ISO 4600, and ISO 6252 still valid until 2006 are adopted with only few changes, Table 2.19. The two new methods are single-stage tests with simultaneous measurement [263]. 

Whether surge is eaused by a deerease in flow veloeity or an inerease in rotational speeds, either the indueer or vaneless diffuser ean stall. Whieh stalls first is diffieult to determine, but eonsiderable testing has shown that for a low-pressure-ratio eompressor, the surge initiates in the diffuser seetion. For units with single-stage pressure ratios above 3 1, surge is probably initiated in the indueer. 

Moffitt, T.P., Prust, H.W. Jr., Szanca, E.M., and Schum, H.J., Summary of Cold-Air Tests of a Single-Stage Turbine with Various Stator Cooling Techniques, NASA, TM X-52969, 1971. 

The values are averaged from tests of conventional single-stage pumps, 2-inch to 8-inch, with capacity at best efficiency point of less than 100 GPM on water performance. 

Table 14 can be regarded as providing a reasonable overall picture, even if the results cannot applied to any particular case. However, if the underlying principle is accepted, it becomes clear that improvements in a single stage, for example the reduction of instrument variation, has a negligible beneficial effect (if this variation was not outside the normal range ). Even if the contribution of repeatability is re-duced to zero, the cumulative uncertainty is reduced by 10% only, i.e. from 2.2 to y(0.0)2 (0.8)2 (1.0)2 + (1.5)2 = 2.0. This statistical view of errors should help to avoid some unnecessary efforts to improve, e.g., calibration. Additionally, this broad view on all sources of error may help to detect the most important ones. Consequently, without participation in proficiency tests, any method validation will remain incomplete. 

The intrinsic germicidal property of the Ti02 support was also tested for natural indoor bioaerosol. A piece of cotton cloth was coated with a colloidal suspension of the nanostructured Ti02. After drying, a circular piece of the cloth was cut and fitted inside the Andersen viable single-stage sampler in such a way... 

Oil, gas and watar flow rates and veasel temperature and presaura together with choke sise and upstream cboke pressure at the well pad are monitored by the computer as before. At the end of the test, reports are produced and three point test data In the well file is updated. Because only a single stage separation process at elevated pressure is used, PVT data stored in the computer is used to correct the measured fluid voliones to standard conditions. Production allocation is handled in the same way by using the upstream choke pressure correlation. 

ASTM D-2961. Standard Test Method for Single-Stage Total Moisture Less Than 15% in Coal Reduced to 2.36-mm (No. 8 Sieve) Topsize. 

Prediction of responses Single-species test result Complex models (life stage, IBM, 4.3.2... 

LC/MS is an important addition to the techniques used routinely to analyze unknown samples. It is not a substitute for other techniques but is complementary, for example, to GC/MS, GC/FTIR, and NMR. In OPCW proficiency tests, a number of laboratories use single-stage LC/MS as a rapid screening procedure for water samples and aqueous extracts of matrices such as soil, and GC/FPD or... 

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