نتایج جستجو برای: multi stage sampling
تعداد نتایج: 992420 فیلتر نتایج به سال:
in this article, modeling and optimization of power consumption of two–stage compressed airsystem has been investigated. to do so, the two – stage compressed air cycle with intercooler offajr petroleum company was considered. this cycle includes two centrifugal compressors, ashell, and a tube intercooler. for modeling of power consumption, actual compressors isentropicefficiencies and intercool...
this research has been taken among the students of high school in karaj city during the years 1391 and 1392. this is a survey research and data gathering is through questionnaires. studying the “an analysis of students’ tendency toward non-native reference groups in karaj”. the questionnaire was distributed among 260 of these students who were chosen through multi step cluster sampling. conside...
objective: the present study aimed to compare mental health of female athlete and non-athlete students in the city of indica. the research methodology was a descriptive survey, which initially described the mental health and then compared it among the students. methods: the statistical population of the study included all high school girls in the academic year of 2012-2013 in the city of indica...
Image synthesis techniques requiringMonteCarlo integration frequentlyneed to generate uniformly distributed samples within the unit hypercube. The ideal sample generation method will maximize the variance reduction as the numberof samples increases. Strati cationvia jittering is one simple, tractable, R. L. Cook. Stochastic sampling in computer graphics. ACM Transactions on Graphics, 5(1):51–72...
The purpose of this research was to investigate the effectiveness of instruction of metacognitive knowledge on academic stress in high school female students. This research method is quasi experimental with pretest and post test. Given this, 37female first grade students (19 subjects in experimental group and 18 subjects in control group) were randomly selected using multi-stage cluster samplin...
aggression is universal behavior that can be seen in all cultures and the most common behavioral problems in adolescence and young adulthood which can cause discomfort and distress of adolescents and young people and those around them. this research aim to survey of some social and individual factors influencing the tendency to aggression among youth in deylam city. the methodology of this stud...
Abstract: This study has been conducted about one of the fundamental debates in educational system and curriculum development titled“social-citizenshiptraining”. The methodology was descriptive-survey and the sampling population was 337 (61 male- 276 female) elementary school teachers in Tabriz which were selected on the basis of multi-staged and comparative cluster sampling For data analysis ...
Optimization under uncertainty has seen many applications in the industrial world. The objective of this paper is to study the stochastic dynamic vehicle allocation problem (SDVAP), which is faced by many trucking companies, container companies, rental car agencies and railroads. To maximize profits and to manage fleets of vehicles in both time and space, this paper has formulated a multistage ...
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