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9. Water Surface Evaporation Reduction Effect Under Different Floating Cover Conditions and Water Saving Benefits Under Different Floating Cover Conditions.

Author

WANG Yong-ping, ZHOU Zhi-xuan, BAO Zi-yun, and JIANG Jia-li

Subjects
BODIES of water, PLASTIC films, WATER temperature, PLASTIC bottles, MATERIALS testing, POLYETHYLENEIMINE, BOTTLED water, BEVERAGE container recycling
Abstract

In order to investigate the effect of water surface evaporation abatement and water saving benefits under different floating coverage conditions, PE bottles, HDPE balls, and plastic film panels were used as test materials, and three different water surface coverage rates were set to carry out two consecutive annual non-glacial large-scale evaporation pool tests in the central arid zone of Ningxia, to comparatively analyze the evaporation abatement rates, water surface temperatures, changes in water quality, and water-saving costs and benefits of different covering materials and coverage rates. The results show that: the evaporation abatement rate of covering materials tends to increase from April to June, and tends to decrease from July to October; under the same conditions, the evaporation rate of the three types of cover of HDPE balls is 42.14%, 56.56%, 70.15%, which is significantly higher than that of PE bottles and plastic film panels; with the increase of the coverage rate of the material, the water body warms up more obviously, and plastic film panels have the greatest impact on water temperature, followed by HDPE balls, and PE bottles; no toxic substances were found in the covered water body and the water quality is stable and getting better. Under the same coverage, the water saving cost of HDPE balls is the lowest, and that of plastic film plates is the highest: with the same coverage material, 50% coverage is the lowest, 75% coverage is the highest; the value of direct benefits of the three materials to eliminate water surface evaporation is negative, but taking into account the indirect benefits of the case, if HDPE balls are used to cover 10 000 m² of water surface, the lifetime coverage rates of 50%, 75%, and 90% can realize positive benefits of 259 400 yuan, 274 100 yuan, and 360 600 yuan, respectively. After a comprehensive consideration of water-saving effect, water-saving costs and benefits, HDPE ball is identified as the water-saving material that can be used to reduce water surface evaporation in arid areas. [ABSTRACT FROM AUTHOR]

Published
2024
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46. Dynamic features extraction system of live pests in farmland

Author

Song Quan-jun, Nie Yu-man, Lei Jian-he, Cao Ping-guo, Qian Jing, and Wang Yong-ping

Subjects
021110 strategic, defence & security studies, Computer science, Machine vision, business.industry, Crop pest, Feature extraction, 0211 other engineering and technologies, 020207 software engineering, Sample (statistics), 02 engineering and technology, Agricultural engineering, Thresholding, Feature (computer vision), Agriculture, 0202 electrical engineering, electronic engineering, information engineering, Extraction (military), business
Abstract

Monitoring of farmland pests is an important prerequisite to sprinkle agriculture in a timely and appropriate manner, which provide an important guarantee for agricultural production. This paper presents a method for obtaining the dynamic characteristics of pests in farmland based on machine vision. First, the pests and the background images are segmented by color feature and thresholding methods. Then, the shape features and the number of pests were obtained by Gaussian filtering. Finally, the quantity of pest motion is obtained by frame-to-frame differencing method. The experimental results show that the accuracy rate of the experimental sample is 99%. It can provide quantitative information of pest activity for plant protection personnel. This system can also be applied in large-scale crop pest monitoring.

Published
2018

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