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The application of Neural Networks in High Energy Physics to the separation of signal from background events is studied. A variety of problems usually encountered in this sort of analyses, from variable selection to systematic errors, are presented. The top--quark search is used as an example to illustrate the problems and proposed solutions., Comment: 11 pages, 3 figures, psfig

The application of Neural Networks in High Energy Physics to the separation of signal from background events is studied. A variety of problems usually encountered in this sort of analyses, from variable selection to systematic errors, are presented. The top--quark search is used as an example to illustrate the problems and proposed solutions., Comment: 11 pages, 3 figures, psfig

A 6-ft diam flooding infiltration test was conducted at a proposed wastewater land treatment site near Chapel Hill, North Carolina. The standard infiltration rate of the soil was 0.13 in./hr, and the reaeration rate of the saturated soil was equivalent to 1.35 in. of water after six days. A conservative wastewater application rate at this site would be between 1 and 2 in./wk.

During the summer of 1979, wastewater was applied 10 times to the Deer Creek Lake, Ohio, land treatment site. Wastewater distribution on the ground during spray application is not uniform; some locations receive less than 70% and others more than 130% of the mean amount applied. The saturated infiltration rate ranges from moderately slow (0.6 cm/hr after 1 hr) to slow (0.3 cm/hr after 12 hours) and can be expressed by 1 approximately = 0.6(t to the -1/4 power) cm/hr. The underdrain flow rate increases approximately as the cube of time until 1 hour after the end of application and then decreases as the reciprocal of time squared. The rate and amount of drainage increases with an increase in the initial soil water content and can be predicted from soil tension measurements. It was possible to calculate the mass water budget at the end of a typical application to within 88% of the actual water applied.

Traffic tests were conducted with two low pressure tire Rolligon-type vehicles and a small, tracked Nodwell with minimal load for 1, 5, and 10 vehicle passes on relatively dry tundra near Lonely, Alaska. The traffic impact was limited to compression of the vegetation and the organic mat and a maximum terrain surface depression of several cm, with no shearing or disaggregation of the mat. (Author)