Effects of solvents, additives, and π-allyl ligand structures on the polymerization behavior of diazoacetates initiated by π-allylPd complexes

2020 ◽  
Vol 11 (10) ◽  
pp. 1774-1784
Author(s):  
Hiroaki Shimomoto ◽  
Moemi Nakajima ◽  
Akihiro Watanabe ◽  
Hirokazu Murakami ◽  
Tomomichi Itoh ◽  
...  
Keyword(s):  
Quality Of Control ◽  
Polymerization Behavior ◽  
Polymer Tacticity ◽  
Allyl Ligands

We have revealed that the quality of control of the polymerization was improved by adding some compounds and polymer tacticity was dependent on the structures of π-allyl ligands.

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.

scholarly journals Quality of Control in the Tavis–Cummings–Hubbard Model

2021 ◽  
Author(s):  
R. Düll ◽  
A. Kulagin ◽  
W. Lee ◽  
Yu. Ozhigov ◽  
H. Miao ◽  
...  
Keyword(s):  
Hubbard Model ◽  
Quality Of Control

ON ASSESSMENT OF THE QUALITY OF CONTROL AND SORTING MACHINES. PART I

2021 ◽  
pp. 27-33
Author(s):  
YA.L. LIBERMAN ◽  
◽  
L.N. GORBUNOVA ◽  
Keyword(s):  
Quality Of Control

ENTREPRENEURIAL OPTIMISM, THE NATURE OF ENTREPRENEURIAL EXPERIENCE AND DEBT DECISION FOR BUSINESS START-UP

2018 ◽  
Vol 22 (03) ◽  
pp. 1850024 ◽  
Author(s):  
HÉDIA FOURATI ◽  
RIHAB BEN ATTITALAH
Keyword(s):  
Earnings Forecasts ◽  
Adjustment Cost ◽  
Debt Ratio ◽  
Entrepreneurial Experience ◽  
Panel Data Estimation ◽  
Quality Of Control ◽  
Start Up ◽  
Serial Entrepreneurs ◽  
Data Estimation

This paper studies the entrepreneurial optimism and debt decisions for business start-up. By analysing a sample of 160 business start-up and by using the panel data estimation, we study entrepreneurs’ optimism and its impact on debt decision of business start-up. The measure of entrepreneurial optimism is based on the entrepreneur earnings forecasts initiated by Lin et al. (2005). Meanwhile, the nature of entrepreneurial experience (serial and portfolio entrepreneur) has an effect on entrepreneurial optimism and leads to more or less optimistic entrepreneur. The results reveal that optimistic entrepreneur prefers equity in funding the financial deficit. Serial entrepreneurs tend to use more debt funding. In the dynamic model, the entrepreneur acquiring business concurrently adjusts slowly to debt ratio. Nevertheless, the sequential entrepreneurial experience leads to more optimism and so on more debt use. Given the governance role played by banks, the high adjustment cost for start-up is a consequence of the efficiency of the quality of control exercised by banks that in spite of entrepreneurial optimism, the entrepreneur does not convince the financiers to be so confident on the prospect of the business.

scholarly journals The sensorless control system for controlling the speed of direct current motor

2019 ◽  
Vol 16 (3) ◽  
pp. 1171
Author(s):  
Khac-Khiem Nguyen ◽  
Trong-Thang Nguyen
Keyword(s):  
Direct Current ◽  
Pid Controller ◽  
Closed Loop ◽  
Dc Motor ◽  
State Equation ◽  
Dynamic State ◽  
Estimation Model ◽  
Loop Control ◽  
Quality Of Control

<p>This research aims to propose an algorithm for controlling the speed of the Direct Current (DC) motor in the absence of the sensor of speed. Based on the initial mathematical model of DC motor, the authors build the dynamic state equation of DC motor, and then build an estimation model to determine the speed of the DC motor without a sensor. The advantages of the proposed method are demonstrated through the closed-loop control model using the PID controller. In order for the results to be objective, we assume that the parameters of the DC motor in the estimation model are not known correctly. The results show that the quality of control in the absence of a sensor is equivalent to the case with the sensor.</p>

scholarly journals GEOMETRIC ASPECTS EVALUATION OF GNSS CONTROL NETWORK FOR DEFORMATION MONITORING IN THE JATIGEDE DAM REGION

2019 ◽  
Vol 15 (2) ◽  
pp. 167
Author(s):  
Made Ditha Ary Sanjaya ◽  
T. Aris Sunantyo ◽  
Nurrohmat Widjajanti
Keyword(s):  
Least Squares ◽  
Deformation Monitoring ◽  
Network Configuration ◽  
Control Networks ◽  
Quality Of Control ◽  
Least Squares Adjustment ◽  
Standard Deviations ◽  
Dam Deformation ◽  
Gnss Networks

Many factors led to dam construction failure so that deformation monitoring activities is needed in the area of the dam. Deformation monitoring is performed in order to detect a displacement at the control points of the dam. Jatigede Dam deformation monitoring system has been installed and started to operate, but there has been no evaluation of the geometry quality of control networks treated with IGS points for GNSS networks processing. Therefore, this study aims to evaluate the geometric quality of GNSS control networks on deformation monitoring of Jatigede Dam area. This research data includes the GNSS measurements of five CORS Jatigede Dam stations (R01, GG01, GCP04, GCP06, and GCP08) at doy 233 with network configuration scenarios of 12 IGS points on two quadrants (jat1), three quadrants (jat2), and four quadrants (jat3 and jat4). GNSS networks processing was done by GAMIT to obtain baseline vectors, followed by network processing usingparameter method of least squares adjustment. Networks processing with least squares adjustment aims to determine the most optimal  by precision and reliability criterion. Results of this study indicate that network configuration with 12 IGS stations in the two quadrants provides the most accurate coordinates of CORS dam stations. Standard deviations value of CORS station given by jat1 configuration are in the range of 2.7 up to 4.1 cm in X-Z components, whereas standard deviations in the Y component are in the range 5.8 up to 6.9 cm. An optimization assessment based on network strength, precision, and reliability factors shows optimum configuration by jat1.

scholarly journals MODEL FOR THE RELIABILITY, AVAILABILITY AND SAFETY OF THE CONTROL CENTERS OF THE VESSEL TRAFFIC MANAGEMENT AND INFORMATION SYSTEMS

2013 ◽  
Vol 25 (4) ◽  
pp. 395-403
Author(s):  
Pančo Ristov
Keyword(s):  
Information Systems ◽  
Traffic Management ◽  
Block Diagram ◽  
System Failure ◽  
Control Center ◽  
Quality Of Control ◽  
Maritime Traffic ◽  
Critical Components ◽  
Quantitative Indicators

The quality of Vessel Traffic Management and Information Systems depends on the quality of all subsystems, in particular the quality of control centers. The most commonly used quantitative indicators of the control centers' quality are: reliability, availability, safety, and system failure. Therefore, a block diagram of reliability and the model for reliability / availability (Markov model) have been created in this paper and a detailed analysis and calculation of the quantitative indicators of critical components (servers) of the control center have been performed. The quality functioning of the control centers will enable gathering, processing, storing and dissemination of timely, safe, and reliable data and information to the services in charge of monitoring and management of maritime traffic.

Experimental studies of the operation dynamics of the motion neuro regulator of a nonlinear dynamic system

2021 ◽  
pp. 26-41
Author(s):  
Yu. Romasevych ◽  
◽  
V. Loveikin ◽  
A. Shevchuk ◽  
I. Bolbot ◽  
...  
Keyword(s):  
Angular Velocity ◽  
Dynamic System ◽  
Nonlinear Dynamic ◽  
Supply Voltage ◽  
Experimental Studies ◽  
Control Process ◽  
Nonlinear Dynamic System ◽  
Quality Of Control ◽  
Control Stability

In the article, experimental studies of the neurocontroller of a laboratory installation of a quadrocopter link are presented. The latter is a nonlinear dynamic system. The input vector of the neurocontroller included the angle of inclination of the rod (a beam of the quadcopter) relative to the horizon, its angular velocity, and the angular velocity of the propeller. The output signal of the neurocontroller is proportional to the supply voltage of the propeller drive. In the article, the planning of experimental studies was carried out and eight indicators were selected, according to which the quality of the control process was evaluated. In addition, a qualitative analysis of the control process of the dynamic system motion was carried out with the corresponding graphical dependencies. The data obtained showed a good quality of control at a zero setpoint angle. For other values of the setpoint (-0.52 and -1.05 rad), the neurocontroller provides the rod aboutness to the setpoint angle and the control stability. However, the quality of control is not high. The reason for this effect has been established in the work. In order to improve the quality of control, the neurocontroller was modified by including an integral component in its structure. At the same time, the steady-state control error has significantly decreased with minor changes in other estimated indicators.

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