نتایج جستجو برای: five sampling times (april

تعداد نتایج: 967563  

Journal: :Journal of economic entomology 2003
J R Umble J R Fisher

Sampling recommendations were developed for a potato bait sampling method used to estimate garden symphylan (Scutigerella immaculata Newport) densities in western Oregon. Sample size requirements were developed using Taylor's power law to describe the relationship between sample means and variances. Developed sampling recommendations performed well at sample sizes of 30 and greater, when valida...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان همدان - دانشکده ادبیات و علوم انسانی 1390

abstract this study is an attempt to determine the effect of nano- technology education on science lesson for fifth grade in primary school in the city of kermanshah. this research is experimental and is conducted in the from of pre-test and post- test for the control group. an achievement test was administered to determine the rate of learning in the students. the research is an applied one. ...

2017
Demeke Lakew Workie Dereje Tesfaye Zike Haile Mekonnen Fenta Mulusew Admasu Mekonnen

BACKGROUND Unintended pregnancy related to unmet need is a worldwide problem that affects societies. The main objective of this study was to identify the prevalence and determinants of unmet need for family planning among women aged (15-49) in Ethiopia. METHODS The Performance Monitoring and Accountability2020/Ethiopia was conducted in April 2016 at round-4 from 7494 women with two-stage-stra...

Journal: :The Musical Times 1917

Journal: :Transactions of the Society of Instrument and Control Engineers 1976

2009
Yingying Li Per A. Mykland Eric Renault Lan Zhang Xinghua Zheng

When estimating integrated volatilities based on high-frequency data, simplifying assumptions are usually imposed on the relationship between the observation times and the price process. In this paper, we establish a central limit theorem for the Realized Volatility in a general endogenous time setting. We ∗We are grateful to Andrew Patton and Neil Shephard, and the participants of the Stevanov...

2016
Naicheng Wu Claas Faber Xiuming Sun Yueming Qu Chao Wang Snjezana Ivetic Tenna Riis Uta Ulrich Nicola Fohrer

There has been increasing interest in diatom-based bio-assessment but we still lack a comprehensive understanding of how to capture diatoms' temporal dynamics with an appropriate sampling frequency (ASF). To cover this research gap, we collected and analyzed daily riverine diatom samples over a 1-year period (25 April 2013-30 April 2014) at the outlet of a German lowland river. The samples were...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده ریاضی 1390

the main objective in sampling is to select a sample from a population in order to estimate some unknown population parameter, usually a total or a mean of some interesting variable. a simple way to take a sample of size n is to let all the possible samples have the same probability of being selected. this is called simple random sampling and then all units have the same probability of being ch...

Journal: :علوم باغبانی ایران 0
محمد باقر یاری دانشجوی کارشناسی ارشد دانشکده کشاورزی دانشگاه بوعلی سینا، همدان منصور غلامی دانشیار دانشکده کشاورزی دانشگاه بوعلی سینا، همدان محمود اثنی عشری دانشیار دانشکده کشاورزی دانشگاه بوعلی سینا، همدان

four separate experiments were conducted to study the effects of factors controlling the establishment of explants from two walnut genotypes z60 and z63 (damavand). factors were explant type, sampling time, explant orientation on the growth medium and antioxidants type. the explants were collected from the collection garden of tooyserkan walnuts research station. four explant types (apical meri...

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