False indication

Verification film has drawbacks that render it useless for some assemblies. For bonded assemblies with complicated tooling and/or multiple layers of adhesive, the additional thickness of the release film plies can cause the verification film to be non-representative of an actual bonded assembly. Details can be moved out of their normal positions Just enough to prevent them from fitting coirectly or tooling from performing correctly, resulting in false indications of problems... 

One day the temperature-measuring device gave a false indication of high temperature. The air valve closed, and the drain valve opened. The temperature indication fell, perhaps because the reactor was now empty. The drain valve stayed open, but the air valve reopened, and a flammable mixture was formed in the reactor. Fortunately it did not ignite. 

Check that the airflow detector is not giving a false indication. 

The electrodes designed for permanent installation on deep-water structures must be protected from damage but must also correctly view the protected structure. Thus electrodes must be closely placed to the structure to avoid the incorporation of an IR element in the potential measured, but must not create a protection shadow which could cause a false indication of the protection level. 

Bioorganic molecules sometimes have the same or similar behavior as the analytes of interest in the analytical methods used to make chemical measurements of soil. Thus, they can falsely indicate the presence of more molecules than is actually the case, or even that an analyte or contaminant is present when it is not or has not been added from an external source. These compounds may also mask analytes of interest by reacting or simply associating with them (see Chapters 13 and 14 for a further discussion and specifics of this topic). 

The Signal Detection principle is a determination of the relationship between hits and false alarms. In determining signal detectability, a stimulus or a few stimuli are presented in random order, alternating with noise. Since sensory impressions resulting from the presentation of stimulus versus noise are assumed to be normally distributed over the same intensity continuum and to have the same dispersion, the index of detectability d for p (hits) minus p (false) indicates the extent to which the two distributions overlap. 

Electrokinetic remediation is limited by the type of contaminant, heterogeneities or anomalies in the soil, extreme pHs, pore water chemistry, lack of pore water, contaminant and noncontaminant ion concentrations, metals precipitation, and reduction-oxidation changes induced by the process electrode reactions. It may be difficult to estimate the time that will be required to remediate a site using this technology. Laboratory treatability testing may provide a false indication of the applicability of electrokinetic remediation at a specific site. Further research is required to determine the technology s limitations and ramifications. 

The thin film fiber optic reflective sensor based on palladium catalyzed W03 appears to work well for detecting hydrogen, but its response time is too slow for critical applications. The sensitivity and speed of hydrogen detection can be enhanced by using the sensor film in a SPR configuration. However, in such a configuration the rapid desorption of water vapor can lead to a false indication of hydrogen whenever the sensor is exposed to a dry... 

Berge reported that ethylhexyldimethyl-PABA is demethylated via a photo oxidation/decarbonylation sequence (23,24). The photoproducts produced are N-mono-methyl substituted or possess a free amino-group. These products have UV absorption spectra very similar to that of the starting dimethylamino compound. Therefore, this transformation cannot be detected, utilizing a simple spectral measurement (12,13). This is an example of a nonreversible photodegradation, which, in the spectral-only measurement, produces a result, which falsely indicates that the test substance/product has a higher photostability than is actually the case. 

At One time it was thought that women taking oral contraceptives were at risk for B deficiency. This notion seem-S to have been in error. The error was due to a misinterpretation of the tryptophan load lest. As mentioned earlier, a deficiency in vitamin B(,can induce the accumulation of specific intermediates of the tryptophan catabolic pathway and enhanced excretion in the urine. Oral contraceptives can also induce ar increase in the formation and excretion of specific intermediates by stimulating the activity of specific enzymes of the tryptophan catabolic pathway, This stimulation was responsible for the false indications of deficiency. Independently of the tryptophan load test, there continues to be some evidence for risk associated with the use of oral contraceptives. Oral contraceptive use may result in lowered levels of plasma vitamin Bf, Tlicsc lowered levels may result in a vitamin deficiency when coupled with pregnancy and lactation. 

Are the following statements true or false Indicate why if a statement is false. 

No false indication of structural differences, arising from diffusion of grease, oil or wax deposits (possible effect on films)... 

One final point related to loss is that loss may occur as total product (leakage or seepage), or by permeation coupled to evaporation. Each of these loss sources needs some form of quantification (see above). It should be noted that if product degradation and solvent evaporation occur similarly, chemical analysis may falsely indicate that no change has occurred, i.e. proportional compensation will mislead the conclusion. 

---