scholarly journals Automatic control of air temperature in the greenhouse considering the weather forecast data

Informatics ◽  
2021 ◽  
Vol 18 (3) ◽  
pp. 59-67
Author(s):  
A. G. Senkov
Keyword(s):  
Automatic Control ◽  
Air Temperature ◽  
Control Method ◽  
Block Diagram ◽  
Control Process ◽  
Weather Forecast ◽  
Temperature Changes ◽  
Mathematical Expressions ◽  
Forecast Data

The paper concerns the problem of improving energy efficiency and the quality of air temperature automatic control in industrial greenhouses. The article proposes a method based on the principle of disturbance compensation using weather forecast data. The plant dynamic model structure is described by the linear 1st order aperiodic link with delay both for the control circuit and for the disturbance circuit. To solve the problem of time delays in the plant mathematical model it is suggested along with the use of outside temperature sensor signal to take into account the weather forecast data for the outdoor temperature changes over the specific forthcoming interval of time. It allows the controller to generate appropriate compensation control signal in advance. The block diagram of the automatic control system of the greenhouse temperature is given. Theoretical mathematical expressions for the regulation algorithm and analysis of regulation quality are obtained and the results of numerical modeling of the temperature control process are presented. The proposed automatic control method can be used to regulate the air temperature in buildings with high requirements for microclimate parameters.

scholarly journals Can temperatures from an online weather forecast service be suitable for modelling growth stages using a CERES-Wheat type phenology model?

2017 ◽  
Vol 8 (2) ◽  
pp. 684-688
Author(s):  
M. Launspach ◽  
J.A. Taylor ◽  
J. Wilson
Keyword(s):  
Air Temperature ◽  
Plant Development ◽  
Weather Forecast ◽  
Growth Stages ◽  
North East ◽  
Temperature Forecast ◽  
Temperature And Precipitation ◽  
Station Data ◽  
Forecast Data ◽  
Phenology Model

Weather and climate have a fundamental impact on plant development. Monitoring key observables, e.g. temperature and precipitation, is paramount for the interpretation of agricultural experiments and simulation of plant development. Whereas the presence of appropriate sensors in a research environment can be expected, the situation can be different in commercial agricultural settings. Local air temperature from online weather forecasts is investigated as a substitute for local weather station data. Hourly air temperature forecast and station data for several locations in Scotland and North East England are aggregated into daily air temperature values spanning a period of several months. Dates for key growth stages using temperatures from weather stations and weather forecast data are compared. For the examples discussed here the date differences in modelled key growth stages did not exceed 3 days indicating that temperature forecast data is suitable for farm-specific applications.

Adaptive Control of Synchromesh Shifting Process for Automated Manual Transmission

2012 ◽  
Vol 455-456 ◽  
pp. 1132-1135
Author(s):  
Peng Gong ◽  
Jian Min Meng ◽  
Jun Qiang Xi
Keyword(s):  
Adaptive Control ◽  
Control Method ◽  
Influence Factors ◽  
Control Process ◽  
Manual Transmission ◽  
The Other ◽  
Automated Manual Transmission ◽  
Two Stages ◽  
The Ideal

It is difficult to gain the ideal effect by using a single control method for shifting process due to many influence factors of synchromesh shifting process in Automated Manual Transmission (AMT). Synchromesh shifting process is divided into two stages. One is stage of eliminating the gap of synchronizer, and the other is the slipping stage of synchromesh. The paper mainly analyses the control process of eliminating the gap of synchronizer. By adopting the adaptive control to reduce the shock of initial shifting stage, it can reduce impact and abrasion wear, and improve the quality of whole shifting process.

scholarly journals Impact of Thermal Control Measures on the Imaging Quality of an Aerial Optoelectronic Sensor

Sensors ◽  
2019 ◽  
Vol 19 (12) ◽  
pp. 2753 ◽  
Author(s):  
Fuhe Liu ◽  
Zhifeng Cheng ◽  
Ping Jia ◽  
Bao Zhang ◽  
Xiaofeng Liu ◽  
...  
Keyword(s):  
Control Method ◽  
Thermal Control ◽  
Image Resolution ◽  
Control Measures ◽  
Optical Simulation ◽  
Element Analysis ◽  
Temperature Changes ◽  
Imaging Quality ◽  
Optoelectronic Sensor

The image resolution is the most important performance parameter for an aerial optoelectronic sensor. Existing thermal control methods cannot eliminate the sensor’s temperature gradient, making the image resolution difficult to further improve. This article analyzes the different impacts of temperature changes on the imaging resolution and proposes modifications. Firstly, the sensor was subjected to thermo-optical simulation by means of finite element analysis, and the different impacts of temperature changes on the imaging quality were analyzed. According to the simulation results, an active thermal control method is suggested to enhance the temperature uniformity of the sensor. Considering the impacts of active and passive thermal control measures, thermal optical analysis was carried out to predict the performance of the sensor. The results of the analysis show that the imaging quality of the sensor has been significantly improved. The experimental results show that the image resolution of the optoelectronic sensor improved from 47 to 59 lp/mm, which demonstrates that the sensor can produce a high image quality in a low-temperature environment.

DYNAMICS OF CHANGES IN THE AVERAGE ANNUAL TEMPERATURE OF THE CITY OF AHVAZ, KHUZESTAN PROVINCE, IRAN

2021 ◽  
pp. 86-90
Author(s):  
T.M. Ryashentseva ◽  
Keyword(s):  
Air Temperature ◽  
Growth Dynamics ◽  
Applied Statistics ◽  
Temperature Changes ◽  
Khuzestan Province ◽  
Average Annual Temperature ◽  
Southwestern Iran ◽  
The City

The aim of the research is to study the dynamics of changes in the average annual air temperature of Khuzestan province in southwestern Iran in the period from 1970-2020, and also to compile models of growth dynamics using statistical analysis methods and models. The object of research is the data on the temperature °C in the territory of the province of Khuzestan for a long-term period. The data on temperature changes was analyzed, and the long-term series of dynamics of the average annual air temperature in the city of Ahvaz was explored. Methods of applied statistics were used for the analysis. In particular, the apparatus of regression analysis and time series modeling. The statistical quality of the obtained mathematical regression models was estimated.

scholarly journals A Study on Data Analysis and Electronic Application for the Growth of Smart Farming

2021 ◽  
Vol 36 (1) ◽  
pp. 209-218
Author(s):  
Dr. Mohammad M. Othman ◽  
K.R. Ishwarya ◽  
Manikandan Ganesan ◽  
Ganesh Babu Loganathan
Keyword(s):  
Automatic Control ◽  
Control Method ◽  
System Development ◽  
Control Process ◽  
Smartphone Application ◽  
Northeast India ◽  
System Control ◽  
Agricultural Crop ◽  
Agricultural Field ◽  
Soil Humidity

This paper proposed the system development especially for watering the agricultural crops depend upon the WSN. This paper focused to develop and model a control process by joint radars in the agricultural crop along with information management through web and smartphone application. The 3 elements are application of mobile, web and hardware. The first element i.e. hardware was executed and designed in manage box hardware linked to gather information about the crops. Soil humidity radars are used to detect the agricultural field linked to the control box. The 2nd element i.e. web method was web depend method which was executed and modeled to handle the details of field and crop information. This element applied information mining to examine the information for finding perfect soil humidity, moisture level and temperature. The last element i.e. mobile method was used mainly to manage field watering by a mobile method in a phone. This allows manual or automatic control by the controller. An automatic control uses information from soil humidity radars for watering the crops. The user may choose the manual method for watering the field in the system control method. The method may send notifications by LINE API for the line app. The method was tested and executed in Northeast India. The outputs displayed the executions to be helpful in the field of agriculture. The humidity level of the soil was appropriately maintained for improving manufacturing in agriculture, growth of vegetables and decreasing cost. Therefore, this paper displays the driving agriculture field by digital creativity.

METHODS ASSESSMENT QUALITY OF ACCOUNTING REPORTING AND MODELS OF THEIR MEASUREMENT

2020 ◽  
Vol 3 (3) ◽  
pp. 95-99
Author(s):  
E. H. ABU ◽  
Keyword(s):  
Internal Control ◽  
Stock Prices ◽  
Control Method ◽  
Financial Statements ◽  
Accounting Conservatism ◽  
Standardized Assessment ◽  
Accrual Quality ◽  
Indirect Measures

The article explores individual approaches used to measure and evaluate the quality of financial state-ments: standardized assessment, accrual-based models (accrual quality), Beneise models (M-Score), in-dexes - the internal control method and the degree of accounting conservatism. The reason for the great dependence on the use of indirect measures (proxies for the quality of financial statements or stock prices) is that some of the qualities of financial statements are unobservable.

Experience with the Relay Procedure for Tuning Controllers in Automatic Control of Chlorination

1993 ◽  
Vol 28 (11-12) ◽  
pp. 257-261
Author(s):  
M. Truett Garrett ◽  
Zaki Ahmad ◽  
Shelly Young
Keyword(s):  
Wastewater Treatment ◽  
Automatic Control ◽  
Time Constant ◽  
Wastewater Treatment Plants ◽  
Relay Feedback ◽  
Quality Of Control ◽  
Incomplete Mixing ◽  
Long Time ◽  
Chlorine Demand

The recent requirements by U.S.E.P.A. for dechlorination and biomonitoring have increased the importance of automatic control of effluent chlorination in wastewater treatment plants. Difficulties with the Ziegler-Nichols controller tuning procedure were reported at the Kyoto Workshop, 1990. Problems are caused by the noise of incomplete mixing, a long time constant, and the disturbances of changing flow and chlorine demand. The Astrom-Hagglund relay feedback procedure provides acceptable control while data is logged to determine the controller constants. Experiences in using the procedure in existing facilities (not redesigning the mixing point) and the quality of control are presented.

Quality Improvement of the DNA extracted by boiling method in Gram negative bacteria

2017 ◽  
Vol 6 (04) ◽  
pp. 5347 ◽  
Author(s):  
Omar B. Ahmed* ◽  
Anas S. Dablool
Keyword(s):  
Dna Extraction ◽  
Control Method ◽  
Extraction Procedure ◽  
Cost Effective ◽  
High Yield ◽  
Gram Negative Bacteria ◽  
Bacterial Dna ◽  
Gram Negative ◽  
E Coli

Several methods of Deoxyribonucleic acid (DNA) extraction have been applied to extract bacterial DNA. The amount and the quality of the DNA obtained for each one of those methods are variable. The study aimed to evaluate bacterial DNA extraction using conventional boiling method followed by alcohol precipitation. DNA extraction from Gram negative bacilli was extracted and precipitated using boiling method with further precipitation by ethanol. The extraction procedure performed using the boiling method resulted in high DNA yields for both E. coli and K. pneumoniae bacteria in (199.7 and 285.7μg/ml, respectively) which was close to control method (229.3 and 440.3μg/ml). It was concluded that after alcohol precipitation boiling procedure was easy, cost-effective, and applicable for high-yield quality of DNA in Gram-negative bacteria.

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