Total sensitivity

Sect. 7.2 Eq. (3.11) Sensitivity Sensitivity matrix Total sensitivity... 

The selection of the delay time and the measurement time is very important to obtain really high sensitivity. If the delay time is too long, the emission intensity decreases and the total sensitivity is lowered. If the delay time is too short, the background fluorescence still remains... 

Since we have multiple products, we define the total sensitivity, ,tot, with respect to kt as... 

The Gyna-ir Correlation can be sharpened by the two-phase argument. With the crosslinking agents confined to their own phase, the quantity of gel should be determined by the total surface area of that phase and, hence, the dispersion of the E/ABP in the polyethylene matrix. If we assume that better blending is achieved by matching the component melt viscosities, then Qninv should be dependent on the sensitizer melt index (MI), the relative volumes of the components -blend ratio, BR - and the total sensitizer concentration (Co). From least squares analyses of our results, we find ... 

These will Include C4F3, C2F2 and C3F4 (l.e., olefins, acetylenes, dloleflns). The cyclic structures will manifest themselves as small signals at 100 and 131 a.m.u. for hexafluorocyclopropane and at 100, 131 and 181 a.m.u. for octafluorocyclobutane (12). The total sensitivity factor of the spectrometer Itself decreases quite rapidly with increasing mass ntuaber. 

They found that more than 55% of the measured transfer impedance was due to the skeletal muscle mass in the thorax and only about 15% originated from blood, heart, and lungs. The sensitivity field for the four tested systems showed only small differences in total sensitivity, but all the same each was a complicated mixture of many factors. 

When the elements of interest in a specimen occur at extremely low concentrations, or when the available amount of material in a specimen is very small, it is desirable to apply the special techniques of trace analysis. In most fluorescence spectrometers the analyzed area on the surface of the specimen is designed to be approximately 5 cm. If the specimen is larger in area than this sensitive region and is much thicker than the thickness yielding 99% of the emitted x-ray intensity, then it can be considered to be of infinite dimensions. Many of the quantitative models and analysis techniques have been developed for this type of specimen. Occasionally, it is necessary to analyze a specimen which is thin compared to the 99% yield thickness or a specimen which cannot cover the total sensitive area of the fluorescence spectrometer. This type of specimen is considered to be of limited quantity. More frequently, specimens of unlimited quantity are available, but several or all of the elements of interest are present at trace concentration levels. 

Photon activation analysis is suited to water analysis because practically unlimited volumes can be irradiated, thus enhancing the total sensitivity and avoiding solidification prior to analysis any pretreatment of water, e.g., evaporation, entails the danger of contamination or undesirable loss of components. Water can be analyzed without pretreatment using photon activation as follows. 

In our system the off-on fluorescence signal was amplified by the energy transfer process from the uncomplexed non-fluorescent TSQ units to the neighbouring luminescent Zn(II) complexes. In a low Zn(II) concentration regime, these self-organized chemosensors showed a 50% increase of the respraise with respect to the reference system TSQ in the same conditions. Even if the total sensitivity gain is quite... 

The total effect of parameter j can be defined as the sum of all sensitivity indices in which parameter j is present. Assume that we have three parameters a, b and c. The total sensitivity index of parameter a is defined as... 

The total sensitivity index characterises the additivity of the parameters (Homma and Saltelh 1996 SaltelH et al. 2010). If the parameters are totally additive, which... 

Liidtke et al. (2007) developed a new version of the method above that they call information-theoretic sensitivity analysis. Here the model is considered as a communication channel , which is a transmitter of information between inputs and outputs. Instead of analysing the variance of the ouQjut distribution, they measured output xmcertainty in terms of Shannon s entropy. The first-order sensitivity index, the higher-order sensitivity indices and the total sensitivity index aU have information-theoretic coxmterparts. 

Saltelli, A., Annoni, P., Azzini, I., Campolongo, F., Ratto, M., Tarantola, S. Variance based sensitivity analysis of model output. Design and estimator for the total sensitivity index. Comp. Phys. Commun. 181, 259-270 (2010)... 

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