An information retrieval performance measure that is interpreted as the percent of perfect performance (PPP) can be used to study the effects of the inclusion of specific document features or feature classes or techniques in an information retrieval system. Using this, one can measure the relative quality of a new ranking algorithm, the result of incorporating specific types of metadata or folk...

—Continuing difficulty in the successful natural regeneration of economically important oak species (Quercus spp.) on highly productive sites has led to considerable research regarding the use of artificial oak regeneration to ensure recruitment of oak as an important component of future stands. Two obstacles to the success of some oak plantings in Tennessee are herbivory by white-tailed deer (...

Catecholamines and platelet aggregation were studied in relation to physical fitness and psychologic traits of 48 young men at rest and after exercise challenge. Test scores were significantly associated with variables derived from the in vitro reactivity of blood platelets. Men characterized by high time urgency, impatience, haste and irritability had higher platelet counts in their whole bloo...

in order to assess the outing mkhmlkvh forest park area of 430 hectares located in the northern city of khorramabad, gis technology was used. maps of the slope, direction and altitude in the software and arcview3.2 arcgis9.2 were prepared. then combine them with a map of the earth was formed. rvyhmgzary map with the land, soil and vegetation classes, environmental unit maps were prepared. units...

A digital model study has been developed for quantitative assessment of experimental errors in the analysis of 133Xe clearance curve from the brain. A small computer synthesized a model of the clearance curve, varying combinations of fast and slow components. The curves were convoluted with Poisson random digits to simulate statistical fluctuations. Identical curves were overlapped with varying...

Some Experimental Errors in Calculating Regional Cerebral Blood Flow From the Intracarotid Xe Clearance Curve • A digital model study has been developed for quantitative assessment of experimental errors in the analysis of Xe clearance curve from the brain. A small Computer synthesized a model of the clearance curve, varying combinations of fast and slow components. The curves were convoluted w...

dehaulling is one of the important stages in sesame grain processing. it includes soaking, dehusking the grain, and separating the husks from kernels. in the present study, a continuous dehuller for an industrial continuous process layout of grain was designed, fabricated and evaluated. the slope and speed of dehuller were the main factors for laboratory experiments. results depicted both facto...

the relationship between altitude, slope and tree age with the red heartwood of beech (fagusorientalis lipsky) were investigated. transect sampling method was used to collect the data. theresults showed that in the 476 sampled trees, 132 trees were suffering the phenomenon of red heartswith deferent shape and size. the results indicate that the tree with red heartwoods in shafa-roudforest area,...

Some Experimental Errors in Calculating Regional Cerebral Blood Flow From the Intracarotid Xe Clearance Curve • A digital model study has been developed for quantitative assessment of experimental errors in the analysis of Xe clearance curve from the brain. A small Computer synthesized a model of the clearance curve, varying combinations of fast and slow components. The curves were convoluted w...