An automatic control device for negative pressure irrigation for continuous low-rate water supply at constant soil wetting

2021 ◽  
Author(s):  
Kechun Wang ◽  
Haiyu Wang ◽  
Junzeng Xu ◽  
Qi Wei ◽  
Zhe Gu ◽  
...  
Keyword(s):  
Water Supply ◽  
Automatic Control ◽  
Negative Pressure ◽  
Control Device ◽  
Soil Wetting ◽  
Low Rate

Automatic control device for the continuous administration of 15O labelled gaseous tracers for PET measurements

1994 ◽  
Vol 45 (9) ◽  
pp. 923-928
Author(s):  
J. Löttgen ◽  
R. Wagner ◽  
N. Richerzhagen ◽  
K. Wienhard
Keyword(s):  
Automatic Control ◽  
Control Device ◽  
Continuous Administration

scholarly journals Effect of continuous negative pressure water supply on the growth, development and physiological mechanism of Capsicum annuum L.

2017 ◽  
Vol 16 (9) ◽  
pp. 1978-1989
Author(s):  
Di LI ◽  
Huai-yu LONG ◽  
Shu-xiang ZHANG ◽  
Xue-ping WU ◽  
Hong-ying SHAO ◽  
...  
Keyword(s):  
Water Supply ◽  
Capsicum Annuum ◽  
Negative Pressure ◽  
Physiological Mechanism ◽  
Capsicum Annuum L ◽  
Pressure Water ◽  
Growth Development

scholarly journals Study on the Performance of the Light Automatic Control Device

2019 ◽  
Vol 237 ◽  
pp. 052064
Author(s):  
Zhiyong Li ◽  
Sibin Zhang ◽  
Wei Liu ◽  
Yuqing Zhao ◽  
Jianling Gao
Keyword(s):  
Automatic Control ◽  
Control Device

METHOD ENSURING ACCESS TO INFORMATION TECHNOLOGICAL RESOURCES OF AUTOMATIC CONTROL SYSTEM BY WATER SUPPLY COMPANY

2016 ◽  
Vol 2016 (2) ◽  
pp. 167-174
Author(s):  
Михаил Рытов ◽  
Mikhail Rytov ◽  
Сергей Шпичак ◽  
Sergey Shpichak
Keyword(s):  
Control System ◽  
Water Supply ◽  
Automatic Control ◽  
Control Systems ◽  
Communication Channels ◽  
Access To Information ◽  
Access Policy ◽  
Automatic Control Systems ◽  
Water Supply Company ◽  
Blom's Scheme

The problems of access control to information and technological resources of automatic control systems for water supply companies are considered. The formalized model of the process of reliable access to information and technological resources is shown. The model takes into account the existence of a multitude of communication channels and a possibility of the organization of the operative cross access. A method to ensure a reliable access to information and technical resources of automatic control systems by water supply companies on the basis of the access policy combination, a scheme of deposit and a preliminary distribution of access authenticators. As a base example there was adopted Blom’s scheme. The method allows ensuring an operative cross access in case of emergency. To ensure an operative access in the method mentioned there was used a scheme of a complete division of a secret in the combination with authenticator evolution. As a basic example the evolution of authenticators based on Lamport’s protocol is considered.

Investigation of the Impact of Anti-Negative Pressure Facility on a Water Distribution System

2013 ◽  
Vol 316-317 ◽  
pp. 719-722
Author(s):  
Huan Huan Wang ◽  
Shu Ming Liu ◽  
Fan Lin Meng ◽  
Lu Bai
Keyword(s):  
Water Supply ◽  
Negative Pressure ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Simulation Method ◽  
Water Tank ◽  
Research Activities ◽  
High Level ◽  
The Impact

High level water tank is a commonly used facility to satisfy water demand for people living in high building, which is also the so-called secondary water supply system (SWSS) in China. Due to lack of maintenance, water quality problem has been frequently reported in the SWSS. In the last few decades, anti-negative pressure facility (ANPF) has emerged as a revolutionary approach for solving the pollution in the SWSS. ANPF makes good use of the municipal pipeline pressure, which is the improvement of traditional water supply. However, most of recent research activities mainly focus on the influence of part of water distribution system (WDS). In this paper, the software of EPANET has been applied in the SWSS calculation and simulation. Besides that, the SWSS with ANPF simulation method is proposed to evaluate the effect of other all nodes pressure in the WDS using hydraulic model. As the cases study, the paper analyzed two WDSs with ANPF. After simulation of the SWSS, the result of WDS, which is smaller, indicates that 6 out of the 9 nodes are affected with ANPF and that of WDS, which is larger, demonstrates that 37 out of the 41 nodes are affected and the affected nodes are focused on the confluent of pipes, especially around the ANPF.

The Automatic Control Device for Opening Almonds Machine

2014 ◽  
Vol 701-702 ◽  
pp. 774-779
Author(s):  
Ze Ding Wei ◽  
Ru Tao Han ◽  
Yong Hui Jia
Keyword(s):  
Automatic Control ◽  
Morphological Changes ◽  
Vibration Signal ◽  
Control Device ◽  
Vibration Sensor ◽  
Step Motor ◽  
Extrusion Force ◽  
Position Signal ◽  
Photoelectric Sensor ◽  
Electrical Components

Opening the almond currently rely on the manual to complete and is unable to meet the requirements of mass production. For the design of almonds opening machine of automatic control device, we determine the morphological changes, vibration characteristics, extrusion force changes and other parameters of the almond of opening moments, so as to provide calculation basis for choosing suitable step motor and determining parameters of circuit’s electrical components. Electromagnetic buzzer as a vibration sensor to detect the vibration signal, the photoelectric sensor to detect the almond’s position signal, the proximity switch sensor to detect the working position and amplified signals to process circuits, under the control of MCU, the step motor driving a load let the almond opening process achieve the automatic.

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