Hard delimiter

The region from A to D is called the dynamic range. The regions 2 and 4 constitute the most imfwrtant difference with the hard delimiter transfer function in perceptron networks. These regions rather than the near-linear region 3 are most important since they assure the non-linear response properties of the network. It may... 

As already noted by Campbell and Greaves (16), the rhizosphere lacks physically precise delimitations and its boundary is hard to demarcate. Dimensions may vary with plant species and cullivar, stage of development, and type of soil. Soil moisture may affect the measurable size of the rhizosphere as well wetter soils may stick better to roots than drier soils (Fig, 1). This will change the volume of soil regarded as rhizosphere soil upon separation of rhizosphere from bulk soil and thus alter the measured concentration in rhizosphere and non-rhizosphere soil of a response variable in exudate concentration or microbial production. 

Size of Subsample. Although it is experimentally obvious that, with many fruits and vegetables, an arbitrary 8- to 30-pound field sample is hardly adequate for true representation of a field plot, practical considerations in large scale field operations delimit the size of the sample. 

Solid lines—region of parallel change in hardness and abrasiveness plotted by Wihsmann and Petzold. Broken lines—region delimited by points of boundary measurements. flVm—hardness after Hanneman, 22—abrasiveness. 

Contamination of new samples by previously amplified genetic material can be a nightmare for people performing PCR routinely. Good organization of the laboratory and compliance to strict rules can prevent the occurrence of this contamination. It is better to be too hard on those, because once the contamination has happened, it is too late. Therefore, at least three different areas must be delimited in the laboratory, three separate rooms if this is possible ... 

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