Search

Your search keyword '"Zhang, Dening"' showing total 17 results
Start Over Author "Zhang, Dening"
17 results on '"Zhang, Dening"'

5. Estimating Topsoil Water Content Using Crop Water Stress Index and Remote Sensing Technologies.

Author

LIN Rencai, CHEN He, ZHANG Dening, WEI Zheng, CAI Jiabing, ZENG Ran, ZHANG Lili, and JIA Yuling

Subjects
REMOTE sensing, TOPSOIL, SOIL moisture, WATER use, WATER in agriculture
Abstract

[Objective] Change in topsoil water content is intricately linked to plant transpiration, and understanding its spatiotemporal variation at large scales is crucial to improving water and agriculture management. The objective of this paper is to investigate the feasibility of remote sensing for estimating topsoil water content, its association with crop water stress index (CWSI) and the impact of cropping systems. [Method] The experiment site was an irrigation field at Jiefangzha in Hetao Irrigation District. The topsoil water content in different cropped lands (sunflower, summer maize, spring wheat and pepper) was calculated, inversely, in 2014 using the MOD16A2 imagery, meteorological data, and the P-M model and CWSI. The estimated soil water content was compared with ground-truth data. [Result] The CWSI and topsoil water content were inversely proportional. The method was accurate for estimating topsoil water content in wheat and sunflower lands, with the determination coefficient between the estimated and measured soil water content for the wheat and sunflower lands being 0.748 and 0.357, respectively. However, it was less accurate for maize and pepper lands as they were irrigated more frequently. These suggested that the remote sensing-based method works better when the soil is dry than when it is wet. [Conclusion] The CWSI-based remote sensing method is more suitable for estimating topsoil water content in lands planted with drought-tolerant crops than lands grown with water-demanded crops which need more irrigation. Our results provide insight into the impact of cropping systems on accuracy and reliability of remote sensing methods for estimating topsoil water content. It has potential application for agricultural management in arid and semi-arid regions. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

7. Rural Distribution Network Fault Location Algorithm Based on Fault Complaint Information

Author

Li Wencai, Zhang Dening, Li Jun, and Li Yan

Subjects
Engineering, business.industry, Fault tolerance, Fault (power engineering), computer.software_genre, Fault indicator, Stuck-at fault, Fault coverage, Rough set, Data mining, Fault model, Decision table, business, computer, Algorithm
Abstract

The present situation of rural distribution network fault location is analyzed. The characteristics of fault calling information of distribution network were discussed. On this basis the rural distribution network fault location algorithms theory based on rough set was proposed. The decision table in accordance with distribution network topology was the main tool of the algorithm, using the ability of processing the uncertainty and incomplete information of the rough set, performing the attribute reduction and value reduction. The minimum fault reduction form was derived to ensure objectivity of the rules. Because of the good fault tolerance, it was able to achieve rapid and accurate to locate the fault in the incomplete callings situation. The reduction process of fault decision-making table is realized through programming using VB language. The example show that the algorithm is simple, feasible and effective.

Published
2011

8. AM2301-based temperature and humidity tester of solar battery system

Author

Suo Xuesong, Xu Hongxia, Chen Guifeng, Zhang Shuguang, and Zhang Dening

Subjects
Engineering, Automatic control, business.industry, Capacitive sensing, Electrical engineering, Humidity, Solar energy, Temperature measurement, Thermostat, Automotive engineering, law.invention, ARM architecture, Solar battery, law, ComputerSystemsOrganization_SPECIAL-PURPOSEANDAPPLICATION-BASEDSYSTEMS, business
Abstract

A tester of environmental parameters of solar energy based on ARM microprocessor of S3C2440A was introduced in this paper, the design of software and hardware and implementation methods were detailed expatiated. The environmental parameters which included temperature, humidity and illumination could be measured and displayed real-timely and adjusted the azimuth of cell panel. The data collected by the tester of would be transferred to the host computer through the industry bus of rs485 which would be Analyzed further and storage. A new single all-calibrated warm humidity sensor AM2301 which included a capacitive humidity sensing element and a NTC thermostat was introduced in this article. The sensor was widely used in the automatic control and intelligent detection field because of remarkable quality and fast response and higher performance-price ratio.

Published
2010

11. Development on the Partial Discharge On-Line Monitoring System of Transformer Based on Embedded System

Author

Zhang Shuguang, Shi Xiang Ling, Kou Hong Juan, Zhang Su, Suo Xuesong, Zhang Dening, Li Haiquan, and Cheng Man

Subjects
Finite impulse response, Artificial neural network, business.industry, Computer science, Wavelet transform, Embedded operating system, law.invention, Wavelet packet decomposition, law, Embedded system, Partial discharge, Software design, business, Transformer
Abstract

Ultrasonic detection method is used in this system, a solutions based on the uClinux embedded operating system and Samsung S3C2410 processor is proposed. The hardware design and software design for system are discussed in detail. The paper studies the application technology of Neural networks and wavelet transform in PD online monitoring system in power transformer. This system has the characteristic of small volume, low cost, high accuracy, high reliability and etc. It can be used widely in future.

Published
2008

Catalog

Books, media, physical & digital resources
See catalog results