نتایج جستجو برای: sampling duration

تعداد نتایج: 411394  

2016
Yi Zou Mario D. van Telgen Junhui Chen Haijun Xiao Joop de Kraker Felix J. J. A. Bianchi Wopke van der Werf

Rice fields host a large diversity of arthropods, but investigating their population dynamics and interactions is challenging. Here we describe the modification and application of a leaf blower-vac for suction sampling of arthropod populations in rice. When used in combination with an enclosure, application of this sampling device provides absolute estimates of the populations of arthropods as ...

2011
J Wang

Adaptive sampling has been used as an efficient sampling strategy in metrology for many years. However, most of the research into adaptive sampling has concentrated on the area of form measurement by coordinate measuring machines. This paper will discuss the use of adaptive sampling, primarily to reduce the measurement time when making high density areal surface measurements, for instruments th...

2004
P. R. Bolton J. E. Clendenin D. H. Dowell P. Krejcik

The effect of ultrafast electron beam bunch dynamics on single shot electro-optic sampling detection schemes is examined. It is shown that ultrashort electron bunch fields of adequate magnitude can dynamically impose additional bandwidth on laser probe pulses. The significance of this effect is evaluated by comparing the dynamics of the laser probe to that of the nonradiative field of a single ...

Journal: :The Annals of occupational hygiene 2014
Frédéric Clerc Raymond Vincent

This study was aimed at quantifying the impact of sampling duration and the number of measurements taken on the quality of assessing occupational exposure to toluene. To this end, a measurement database was built, based on four campaigns carried out in an industrial printing facility. Five homogeneous exposure groups (HEGs) were set up and between 120 and 290 individual measurements lasting fro...

Journal: :Biometrics & Biostatistics International Journal 2017

Journal: :iran agricultural research 2015
naghmeh moghimi yahya emam

in order to evaluate the impact of different amounts of nitrogen fertilizer on growth and yield of two forage sorghum cultivars, a 2-year field experiment was carried out at the college of agriculture, shiraz university, shiraz, iran during 2010 and 2011 growing seasons. two factorial experiments were carried out in randomized block design with three replicates, in which the treatments included...

2010
Jawad Ahmad

This paper describes the design of a voltage based maximum power point tracker (MPPT) for photovoltaic (PV) applications. Of the various MPPT methods, the voltage based method is considered to be the simplest and cost effective. The major disadvantage of this method is that the PV array is disconnected from the load for the sampling of its open circuit voltage, which inevitably results in power...

2009
Y. Pang X. Zhang

Introduction: The combination of sparse pulses and parallel transmission [1, 2] can further reduce the excitation duration using both coil sensitivity and sparse k-space sampling. In this work, a novel sparse parallel transmission design is proposed to further shorten the pulse duration by using an optimal k-space trajectory. The k-space is firstly sampled using the Monto-Carlo sampling schemes...

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