[lemma=sample] [lemma=and] [□=□]
[lemma=sample] [lemma=and] [lemma=□]
The following table gives the number of samples and the percentages in each category . Significant components of the NAWQA Program include consistent methods for sampling and the use of complex " clean " sampling protocols that ensure the validity and integrity of the data . For the field assisted photocathodes examined in this thesis , the front surface of the sample and the stainless steel sample holder are maintained at a negative voltage with respect to ground in order to drive the photoemitted electrons toward the energy analyzer . For the 20/1 distribution , the back of the sample is at -21 volts and the stainless steel sample holder is at -20 volts , while for the 21/0 distribution both the back of the sample and the sample holder are at -21 volts . The lateral diffusivity was found to be higher than the transverse diffusivity for all the samples and the effective moisture diffusivities depended strongly on the moisture content . Earlier focus groups suggested that young women preferred the privacy of home sampling and the convenience of picking up kits , at no cost , from either within their home community or through the Internet . Counts taken on the same day can be quite variable depending on the exact location of the leaves sampled and the skill of the individual making those counts . The sampling approach to profiling implemented in virtually all profilers to date has several limitations , centering around statistical significance and unwanted correlations between the sampling and the executing code . Having these samples and the information they contain allow Survey geologists and the public to access this information without leaving town or the expense of reacquiring the samples , which in most cases would be impossible . The six astronauts spent the first half of their workday assisting payload controllers with investigations into materials processing of samples and the growth of crystals while documenting the progress of starfish and mussel development in a spaceborne aquarium in the Spacehab module in the Shuttle 's cargo bay . Fifty-three percent of both the original sample and the follow-up sample were from the agricultural community . The present data are constrained by our original sample and the use of local respondents thus a necessary next step is to widen the selection of both sample .