scholarly journals Discovery of Endophytic Strains With Excellent Antagonism to Colletotrichum Scovillei in Sweet Pepper and Study on Their Biological Functions

2021 ◽  
Author(s):  
Lijuan Wei ◽  
Chengde Yang ◽  
Lingxiao Cui ◽  
Mengjun Jin ◽  
Richard Osei
Keyword(s):  
Biological Control ◽  
Good Control ◽  
Sweet Pepper ◽  
Morphological Identification ◽  
Control Effect ◽  
Gene Sequence Analysis ◽  
Pepper Leaves ◽  
Colletotrichum Scovillei ◽  
High Salt Tolerance ◽  
And Control

Abstract Anthracnose caused by Colletotrichum spp. is a well-known disease that causes severe losses in pepper production which is used as a spice for thousands of households in many parts of China. With the biological control properties of endophytic strains have been developed and used have been of great importance in the prevention and control of anthracnose and environmental protection. Therefore, to control the pathogen Colletotrichum scovillei more safely, 58 endophytic strains were isolated from pepper leaves in this experiment. Plate resistance method was used to screen the antagonistic strains of C. scovillei, and it was found that the inhibition rate of 25 antagonistic strains against C. scovillei was greater than 60%, and the inhibitory rates of L1-7 and L3-5 against it were 79% and 80%, respectively. They were identified as Bacillus amyloliquefaciens and Bacillus velezensis by culture and morphological identification, combined with 16S rDNA and gyrB gene sequence analysis. The two antagonistic endophytic bacteria also had the ability to fix nitrogen and secrete IAA, and all had high salt tolerance. Controlled pot experiments in the laboratory showed that L1-7 and L3-5 had a good control effect against C. scovillei, with the control efficiency reaching 80.64% and 73.39%, respectively. Thus, B. amyloliquefaciens (L1-7) and B. velezensis (L3-5) could be useful as biological control agents to protect peppers from anthracnose disease caused by C. scovillei. The results of this test provide a basis for the development of pepper endophytic bacterial resources, and also bacterial resources for the biological control of C. scovillei.

Study of Alumina Concentration Control Based on Intelligent Characteristic Model

2011 ◽  
Vol 317-319 ◽  
pp. 1314-1317 ◽  
Author(s):  
Tian Pei Zhou
Keyword(s):  
Control Method ◽  
Good Control ◽  
Aluminum Production ◽  
Alumina Concentration ◽  
Analysis Model ◽  
Control Effect ◽  
Characteristic Model ◽  
Electrolytic Aluminum Production ◽  
And Control ◽  
Measurement And Control

In electrolytic aluminum production processing, the measurement and control of alumina concentration is one of the three most important control aims. However, due to alumina concentration can not be measured directly and continuously online, and electrolytic aluminum production process is nonlinear, time-varying and large delay, which can not be described through the mathematical analysis model. Therefore, efficient and reliable development of alumina concentration control method is very important. In view of the above problems, alumina concentration is controlled by intelligent characteristic model and single neural adaptive PID controller, which achieve a good control effect.

scholarly journals Design and Control of a Novel Single Leg Structure of Electrically Driven Quadruped Robot

2020 ◽  
Vol 2020 ◽  
pp. 1-12 ◽  
Author(s):  
Mingfang Chen ◽  
Hao Chen ◽  
Xuejun Wang ◽  
JiangXuan Yu ◽  
YongXia Zhang
Keyword(s):  
Control Method ◽  
Good Control ◽  
Quadruped Robot ◽  
Structure Design ◽  
The Body ◽  
Interpolation Algorithm ◽  
Control Effect ◽  
Simulation And Experiment ◽  
Control Principle ◽  
And Control

In order to solve the defects of the large inertia and control difficulty of the electrically driven quadruped legs of robots, a novel leg structure and a control method are proposed in this paper. In terms of structure, the motor of the knee is arranged in the body of the robot to reduce the weight of the legs. In addition, this paper improves the PVT difference control algorithm embedded in the PMAC controller. Using the nonlinear control principle of the U-model, the optimized segmented Hermite difference method is used to implement the planning of the foot trajectory of the quadruped robot. Simulation and experiment show that the leg structure design is reasonable and the improved interpolation algorithm has good control effect.

Application of Intelligent Characteristic Model in Alumina Concentration Control System

2011 ◽  
Vol 328-330 ◽  
pp. 1837-1840
Author(s):  
Tian Pei Zhou
Keyword(s):  
Control Method ◽  
Good Control ◽  
Aluminum Production ◽  
Analysis Model ◽  
Control Effect ◽  
Characteristic Model ◽  
Density Control ◽  
Electrolytic Aluminum Production ◽  
And Control ◽  
Measurement And Control

In electrolytic aluminum production processing, the measurement and control of alumina density is one of the three most important control aims. However, due to alumina density can not be measured directly and continuously online, and electrolytic aluminum production process is nonlinear, time-varying and large delay, which can not be described through the mathematical analysis model. Therefore, efficient and reliable development of alumina density control method is very important. In this paper, alumina density is controlled by single neural adaptive PID controller in electrolytic aluminum production processing, and alumina density based on intelligent characteristic model is established by using the intelligent characteristic model method, takes the model as the control model, alumina density is controlled combination of the two advantage, which achieve a good control effect.

scholarly journals Modeling and Simulation of Ship-Borne Weapon Stabilization System Based On Double Position Loop Control

2021 ◽  
Vol 2066 (1) ◽  
pp. 012107
Author(s):  
Pu Dai ◽  
Jun Pan ◽  
Yan Cao ◽  
Qing Ma ◽  
Manli Du
Keyword(s):  
Control Method ◽  
Good Control ◽  
Weapon System ◽  
Stabilization System ◽  
Control Effect ◽  
Loop Control ◽  
Stabilization Control ◽  
System A ◽  
And Control ◽  
Ship Rolling

Abstract In order to solve the problem of increasing system cost and low control accuracy by adding gyroscope or inertial navigation system, a dual position loop control ship-borne stabilization system is proposed in the paper. The mathematical model is established to analyze the influence of ship rolling factors on the space pointing of single position loop weapon system. On this basis, the control strategy of double position loop is proposed, and the simulation structure and control method of inner position loop and double position loop are described respectively. The simulation results show that the method can isolate the factors of ship rolling, realize the closed-loop stabilization control of weapon system in geodetic coordinate without adding system hardware cost, and have good control effect as well.

Research on P2P Traffic Monitoring System Based on DPI Technology

2014 ◽  
Vol 686 ◽  
pp. 277-281
Author(s):  
Zhi Qiang Ma
Keyword(s):  
Monitoring System ◽  
Good Control ◽  
Traffic Monitoring ◽  
Control Technology ◽  
Interference Control ◽  
Control Effect ◽  
Network Traffic Monitoring ◽  
And Performance ◽  
And Control ◽  
P2p Technology

This paper focuses on the key technologies of P2P technology and network traffic monitoring, which focuses on AC automaton and bypass interference control technology, and on based of it, we design a new P2P traffic monitoring system. The system uses DPI and DFI recognition technology, as well as straight loss and bypass interference control technology, basically meet the recognition and control of P2P traffic. Finally, the test results show that this system recognition accuracy of P2P traffic is high, good control effect, function and performance meet the design requirements.

scholarly journals Comparative Transcriptome Analysis Reveals the Mechanism Related to Fluazinam Stress of Panonychus citri (Acarina: Tetranychidae)

Insects ◽  
2020 ◽  
Vol 11 (11) ◽  
pp. 730
Author(s):  
Yi Shang ◽  
Yanbo Wang ◽  
Jianyu Deng ◽  
Xunyue Liu ◽  
Yihao Fang ◽  
...  
Keyword(s):  
Superoxide Dismutase ◽  
Mechanism Of Action ◽  
Good Control ◽  
Glutathione S Transferase ◽  
Control Effect ◽  
Panonychus Citri ◽  
Transcriptomic Sequencing ◽  
Cytochrome P450 Genes ◽  
Differential Expression Genes ◽  
And Control

The use of a large number of chemical acaricides to control these pest mites has led to an increasing problem of pesticide resistance, which has always been the difficulty in integrated pest management (IPM). Fluazinam has a good control effect on Panonychus citri, the serious pest on citrus; however, we only know the mechanism of action of fluazinam as a fungicide and its mechanism of action on mites remains unclear. Through analysis using Illumina high-throughput transcriptomic sequencing and differential expression genes in P. citri treated with fluazinam, 59 cytochrome P450 genes, 23 glutathione s-transferase genes, five carboxylate esterase genes, 11 superoxide dismutase genes and 15 catalase genes were identified. The Gene Ontology enrichment and the enrichment of KEGG results showed that the treatment were enrichment for redox enzyme pathways. Evaluating the efficacy of fluazinam, and analyzing the transcriptome data of P. citri under fluazinam stress, potentially provide a new agent for prevention and control of P. citri, and also preliminary research results for exploring the mechanism of action of fluazinam on P. citri. Given the up-regulated expression levels of genes for Mn-superoxide dismutase and catalase, we speculate that they play an important role in fluazinam-stress action on P. citri.

scholarly journals Evaluating the effectiveness of measures to control the novel coronavirus disease 2019 in Jilin Province, China

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Qinglong Zhao ◽  
Yao Wang ◽  
Meng Yang ◽  
Meina Li ◽  
Zeyu Zhao ◽  
...  
Keyword(s):  
Prevention And Control ◽  
Good Control ◽  
Asymptomatic Infection ◽  
Jilin Province ◽  
Control Measures ◽  
First Case ◽  
Before And After ◽  
Novel Coronavirus ◽  
Reported Data ◽  
And Control

Abstract Background Based on differences in populations and prevention and control measures, the spread of new coronary pneumonia in different countries and regions also differs. This study aimed to calculate the transmissibility of coronavirus disease 2019 (COVID-19), and to evaluate the effectiveness of measures to control the disease in Jilin Province, China. Methods The data of reported COVID-19 cases were collected, including imported and local cases from Jilin Province as of March 14, 2019. A Susceptible–Exposed–Infectious–Asymptomatic–Recovered/Removed (SEIAR) model was developed to fit the data, and the effective reproduction number (Reff) was calculated at different stages in the province. Finally, the effectiveness of the measures was assessed. Results A total of 97 COVID-19 infections were reported in Jilin Province, among which 45 were imported infections (including one asymptomatic infection) and 52 were local infections (including three asymptomatic infections). The model fit the reported data well (R2 = 0.593, P < 0.001). The Reff of COVID-19 before and after February 1, 2020 was 1.64 and 0.05, respectively. Without the intervention taken on February 1, 2020, the predicted cases would have reached a peak of 177,011 on October 22, 2020 (284 days from the first case). The projected number of cases until the end of the outbreak (on October 9, 2021) would have been 17,129,367, with a total attack rate of 63.66%. Based on the comparison between the predicted incidence of the model and the actual incidence, the comprehensive intervention measures implemented in Jilin Province on February 1 reduced the incidence of cases by 99.99%. Therefore, according to the current measures and implementation efforts, Jilin Province can achieve good control of the virus’s spread. Conclusions COVID-19 has a moderate transmissibility in Jilin Province, China. The interventions implemented in the province had proven effective; increasing social distancing and a rapid response by the prevention and control system will help control the spread of the disease.

Application of PID in Controllable Pitch Propeller of a Multipurpose Ocean Tug

2013 ◽  
Vol 464 ◽  
pp. 253-257
Author(s):  
Hui Fang Chen
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
High Reliability ◽  
Control Process ◽  
Good Control ◽  
Control Performance ◽  
Hardware Configuration ◽  
Design Idea ◽  
And Control

This paper takes the automatic control system of controllable pitch propeller in a multipurpose ocean tug as an example to describe the application of the S7-200 series PLC in the control system of 4500 horse power controllable pitch propeller in detail. The principle of control system is addressed, as well as the hardware configuration, the design idea of the main software and control process. The system shows high reliability, accuracy and good control performance in practical in practical running.

The Research of Air Precooling System Based on Generalize Predictive Control Strategy

2013 ◽  
Vol 433-435 ◽  
pp. 1091-1098
Author(s):  
Wei Bo Yu ◽  
Cui Yuan Feng ◽  
Ting Ting Yang ◽  
Hong Jun Li
Keyword(s):  
Predictive Control ◽  
Control Strategy ◽  
Control Algorithm ◽  
Exchange Process ◽  
Generalized Predictive Control ◽  
Matlab Simulation ◽  
Control Effect ◽  
Heat Exchange Process ◽  
Complex Control System ◽  
And Control

The air precooling system heat exchange process is a complex control system with features such as: nonlinear, lag and random interference. So choose Generalized Predictive Control Algorithm that has low model dependence, good robustness and control effect, as well as easy to implement. But due to the large amount of calculation of traditional generalized predictive control and can't juggle quickness and overshoot problem, an improved generalized predictive control algorithm is proposed, then carry out the MATLAB simulation, the experimental results show that the algorithm can not only greatly reduce the amount of computation, but also can restrain the overshoot and its rapidity.

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