Screening efficiency

Screen Ejficiency There is confusion concerning the meaning of screen efficiency, as a uniform method for figuring efficiency has never been established. A sound method of evahiating screen performance is given by W. S. Tyler, Inc., Mentor, Ohio, in its Sieve Handbook, no. 53. In this formula, when material put through the screen is the desired product, efficiency is the ratio of the amount of undersize obtained to the amount of undersize in the feed. 

When the object is to recover an oversize produc t from the screen, efficiency may be expressed as a ratio of the amount of oversize obtained to the amount of true oversize ... 

Other formulas for the derivation of screen efficiency are used. Taggart Handbook of Mineral Dressing) gives the formula... 

Langer T, Wolber G. Virtual combinatorial chemistry and in silica screening efficient tools for lead structure discovery Pure Appl Chem 2004 76 991-6. 

The screen efficiency of a screen (known also as effectiveness of a screen) is a measure of the success of a screen in closely separating materials A and B. Provided the screen works perfectly, all of material A would be in the overflow, and all of material B would be in the underflow. An usual measure of screen effectiveness is the ratio of oversize material A that is actually in the overflow to the amount of A entering with the feed. These amounts are D mD and F mF, respectively. Thus... 

The smokes produced by WP and RP have large yield factors for various relative humidities. This means that the inference derived on the basis of TOP values of various types of smokes is also supported by the yield factor values, that is, the screening efficiency of the phosphorus class of smokes is maximum. 

The screening efficiency of a smoke cloud is generally measured in a smoke chamber. 

Based on higher TOP, yield factor and screening efficiency values, it can be safely concluded that WP and RP are better screening agents than HC and other screening agents. 

In addition to location, the concentration of MAAs is critical for screening efficiency. Correlation of concentration to UV sensitivity has been established for many biological UV-absorbing... 

Effect of sieve motion on screening efficiency. U. S. Bur. Mines Rept. Investigations 2933. 

One such approach is the Plackett-Burman (2) design in which a large number of variables can be screened efficiently by a small number of experiments. This design is based on balanced incomplete blocks which allow the statistical identification of the nonaffecting variables. The remaining relatively small number of variables that may be important can be examined in further detail. In the... 

The choice of an appropriate class of multiple-pulse sequences and its parametrization is critical for the success of the screening and optimization process. In particular, the number of variable parameters that determine the dimensionality of the parameter space must be carefully chosen. In general, the flexibility and potential performance of a multiple-pulse sequence increases with the number of parameters. However, if the size of the parameter space is too large, it cannot be screened efficiently and it can be impossible to find good sequences in a reasonable amount of time. For many applications, powerful Hartmann-Hahn mixing sequences can be developed with a minimum number of variable parameters if supercycling schemes are used to expand a basic composite pulse and if the symmetry properties of composite pulses are taken into account (Levitt, 1982 Murdoch et al., 1987 Ngo and Morris, 1987 Shaka and Pines, 1987 Lee and Warren, 1989 Lee et al., 1990 Simbrunner and Zieger, 1995). 

Number of grade Screens Efficiency, per cent Number of grade Screens Efficiency, per cent... 

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