A Method to Calculate Antenna Factor by a Single Site Attenuation

Morioka, Toshihiro; Nakamori, Takeshi; Komiyama, Kanki

doi:10.1109/cpem.2004.305529

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…This study selected water-quality monitoring data from 2010 to 2020 from the upper Fanying section in Nanyang for evaluation, and the changes in each water-quality indicator over time are shown in Figure 6, and the evaluation results of the single-factor evaluation method [29] are shown in Table 2.…”

Section: Water-quality Assessment Criteria and Resultsmentioning

confidence: 99%

Simulation Study on the Impact of South–North Water Transfer Central Line Recharge on the Water Environment of Bai River

Zhang

Zheng

et al. 2023

Water

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To effectively improve the water quality of the Bai River, this paper proposes the use of the ecological replenishment of the South–North Water Transfer as a measure for the integrated allocation of water resources, addressing the impact of complex topography, climate, and human disturbances on the river’s water environment. This measure can alleviate the problem of water shortage and significantly enhance the quality of the Bai River’s water environment. Using the MIKE21 coupled hydrodynamic and water-quality model, this paper analyzes the impact of ecological recharge on river hydrodynamics and simulates the evolution of various water-quality indicators, including dissolved oxygen (DO), permanganate index (CODMn), chemical oxygen demand (COD), ammonia nitrogen (NH3-N), and total phosphorus (TP) under different scenarios. The aim of this paper is to investigate the impact mechanism of ecological recharge on the river’s water environment. The results show that the most significant improvement in river water quality is achieved when the recharge flow is 2Q and the recharge duration is 1/2T (scenario 1), with the river improving from a grade IV water-quality standard to a grade III water-quality standard, and COD and TP indicators improving to a grade II water standard, with the largest improvement rate of 94.67% seen in DO, with the best improvement rate of 94.67% in DO indicators and the best reduction rate of 66.67% in TP indicators. Overall, ecological replenishment can significantly improve the Bai River’s water quality, with scenario 1 being the most effective approach. The results of this study may provide theoretical and technical support for the future management of river water environments.

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Section: Water-quality Assessment Criteria and Resultsmentioning

confidence: 99%

Simulation Study on the Impact of South–North Water Transfer Central Line Recharge on the Water Environment of Bai River

Zhang

Zheng

et al. 2023

Water

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“…Since the AFs obtained by the 2-antenna method are not free from the mutual coupling between antenna elements, a large deviation is found when the horizontal separation becomes short. Crosses are the measured AFs by [3]. Another 30 MHz resonant dipole is employed as the transmitting antenna and located at 4.0 m above the ground plane.…”

Section: Resultsmentioning

confidence: 99%

Antenna factors of an off-resonant dipole antenna

Morioka

2012

2012 Conference on Precision Electromagnetic Measurements

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An off-resonant antenna, such as a shortened dipole is widely used in electromagnetic compatibility measurements due to compactness. The antenna factor of the shorten dipole antenna is ordinary calibrated by comparing that of the standard antenna. However, considerable errors are introduced by applying this method with an insufficient separation due to the coupling with the transmitting antenna and the field distribution along the element. In the present paper, errors in calibrating the off-resonant dipole antenna by the reference antenna method are discussed for the successful measurement.

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A Method to Calculate Antenna Factor by a Single Site Attenuation

Cited by 2 publications

References 2 publications

Simulation Study on the Impact of South–North Water Transfer Central Line Recharge on the Water Environment of Bai River

Simulation Study on the Impact of South–North Water Transfer Central Line Recharge on the Water Environment of Bai River

Antenna factors of an off-resonant dipole antenna

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