for estimating plants water requirement at the different stages of plant growth, determination of crop coefficient is very important. therefore, this study was conducted to determine the crop coefficient of borage in research lands of faculty of agriculture at the university of tabriz in 2013. for this purpose, drainage lysimeter with diameter of 1.5 meter and depth of 1.7 meter was used for de...

The effect of the number and configuration participating stations on lightning location outside network is herein studied by evaluating deviation distance between reference locations determined ToA technique, using recorded data from in Fujian. It was found that decreases with increase stations, changing 0.07 to 424.7 km an average 35 for five while being 0.03~21.6 2.2 km, respectively, eight s...

The Local Area Augmentation System (LAAS) is intended to provide real-time differential GPS corrections with the high accuracy, availability, and integrity required for Category II/III landings. In order to meet these requirements, errors due to ionospheric effects must be bounded such that integrity is maintained with minimal loss of availability. This paper describes the process by which arch...

In this paper, we suggest a novel system that is capable of measuring absolute distances with an uncertainty of one micrometer, or better, over a distance of up to 20 meters. This system consists of a Michelson interferometer, a tunable external cavity diode laser, a wavelength meter, a digital camera and a computer. The Michelson interferometer contains a reference arm mirror, a target arm mir...

This study investigated pollutants emissions from filling stations and their impact on the air quality. Gas monitors were employed to identify the different pollutants present in the ambient air of the study areas. The results showed that the most prominent pollutants present in the ambient air are the volatile organic compounds followed by methane, then carbon monoxide. Measurements were taken...

The SBAS, satellite-based augmentation system, is basically the wide-area differential GPS (WADGPS) effective for numerous users within continental service area. For a practical investigation of wide-area augmentation technique, the authors have implemented the prototype system of the SBAS. It has achieved positioning accuracy of 0.3 to 0.6 meter in horizontal and 0.4 to 0.8 meter in vertical, ...

siah mahi, capoeta capoeta gracilis, is a predominant fish in the river systems of the south caspian sea basin. although there is evidence of the geographical divergence of this taxon, but no information is available on genetic differences within the subspecies populations. this study was designed to evaluate variation and differentiation in the tajan river and investigation shahid rajaii dam e...