An apparatus for the study of fast precipitation reactions

1989 ◽  
Vol 53 (373) ◽  
pp. 527-530 ◽  
Author(s):  
David Rickard
Keyword(s):  
Steady State ◽  
Reaction Time ◽  
Detailed Analysis ◽  
High Precision ◽  
Good Accuracy ◽  
Iron Sulphide ◽  
Reaction Progress ◽  
T Tube ◽  
Sulphide Precipitation ◽  
Precipitation Reactions

AbstractAn apparatus is described for the measurement of the rates of fast precipitation reactions. It consists of a T-tube, where reactants are added to the arms of the T, mixed rapidly at the junction, and the rates of disappearance of reactants or appearance of products are measured along the stem of the T. The geometry of the system results in a steady state being established in the apparatus, enabling detailed analysis of reaction progress. The apparatus has been used to investigate the kinetics and mechanism of iron sulphide precipitation reactions. It has enabled measurements to be made with relatively high precision and good accuracy of the first 130 ms of reaction time.

A high-precision magnetoencephalographic study of human auditory steady-state responses to amplitude-modulated tones

2000 ◽  
Vol 108 (2) ◽  
pp. 679-691 ◽  
Author(s):  
Bernhard Roß ◽  
Christian Borgmann ◽  
Rossitza Draganova ◽  
Larry E. Roberts ◽  
Christo Pantev
Keyword(s):  
Steady State ◽  
High Precision ◽  
Steady State Responses ◽  
Auditory Steady State Responses ◽  
State Responses

The Effects of Energy Dissipation on the Transition to Planing of a Boat

1989 ◽  
Vol 33 (01) ◽  
pp. 35-46
Author(s):  
P. M. Naghdi ◽  
M. B. Rubin
Keyword(s):  
Steady State ◽  
Energy Dissipation ◽  
Detailed Analysis ◽  
Leading Edge ◽  
Steady State Solution ◽  
State Solution ◽  
Inviscid Fluid ◽  
Two Dimensional ◽  
Spray Formation ◽  
Propulsion Force

The problem of the transition to planing of a boat, in the presence of the effect of spray formation at the boat's leading edge, is investigated using a nonlinear steady-state solution of the equations of the theory of a directed fluid sheet for two-dimensional motion of an incompressible inviscid fluid. The motion of the fluid is coupled with the motion of the free-floating boat and detailed analysis is undertaken pertaining to such features as trim angle, sinkage, and propulsion force. The effects of the rate of energy dissipation arising from spray formation at the boat's leading edge, and changes in equilibrium depth, propulsion angle, and the boat's weight, are studied and shown to significantly influence the boat's planing characteristics.

scholarly journals Electrothermal Averaged Model of a Diode-Transistor Switch Including IGBT and a Rapid Switching Diode

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3033 ◽  
Author(s):  
Paweł Górecki ◽  
Krzysztof Górecki
Keyword(s):  
Steady State ◽  
Integrated Circuit ◽  
Good Accuracy ◽  
Bipolar Transistor ◽  
Transistor Switch ◽  
Insulated Gate Bipolar Transistor ◽  
Self Heating ◽  
Proposed Model ◽  
Rapid Switching ◽  
Averaged Model

This study proposes an electrothermal averaged model of the diode–transistor switch including insulated gate bipolar transistor (IGBT) and a rapid switching diode. The presented model has the form of subcircuits dedicated for simulation program with integrated circuit emphasis (SPICE) and it makes it possible to compute characteristics of DC–DC converters at the steady state considering self-heating phenomena, both in the diode and in IGBT. This kind of model allows computations of voltages, currents and internal temperatures of all used semiconductor devices at the steady state. The formulas used in this model are adequate for both: continuous conducting mode (CCM) and discontinuous conducting mode (DCM). Correctness of the proposed model is verified experimentally for a boost converter including IGBT. Good accuracy in modeling these converter characteristics is obtained.

scholarly journals Analysis of M/M/1 Queuing System with Customer Reneging During Server Vacations Subject To Server Breakdown and Delayed Repair

2018 ◽  
Vol 7 (4.10) ◽  
pp. 552
Author(s):  
Ch. Swathi ◽  
V. Vasanta Kumar
Keyword(s):  
Steady State ◽  
Closed Form ◽  
Detailed Analysis ◽  
Performance Measures ◽  
Queuing System ◽  
Multiple Vacation ◽  
Delayed Repair ◽  
Server Breakdown ◽  
Number Of Customers ◽  
Steady State Probabilities

In this paper, we consider an M/M/1 queuing system with customer reneging for an unreliable sever. Customer reneging is assumed to occur due to the absence of the server during vacations.  Detailed analysis for both single and multiple vacation models during different states of the server such as busy, breakdown and delayed repair periods is presented. Steady state probabilities for single and multiple vacation policies are obtained. Closed form expressions for various performance measures such as average number of customers in the system, proportion of customers served and reneged per unit time during single and multiple vacations are obtained.   

Structure and Control on FSM Subsystem in Precision Tracking

2014 ◽  
Vol 624 ◽  
pp. 449-453
Author(s):  
Guang Hua Wu ◽  
Hang Li ◽  
Jun Xing Li ◽  
Yong Hui Wang
Keyword(s):  
Control System ◽  
Detailed Analysis ◽  
Experimental Model ◽  
High Precision ◽  
System Performance ◽  
Servo Control ◽  
Fast Speed ◽  
Tracking Technique ◽  
Precision Tracking ◽  
And Control

According to the characteristics of Fast Speed Mirror, the paper discusses that, in a FSM composite axis control system, the mechanism of the servo control, the main system performance, the speed loop of subsystem and effects of automatic zero locking system. Combined with traditional methods, a new structure of axial subsystem is proposed, to improve the rapid high-precision tracking technique. From theory to experimental model, the paper made a detailed analysis.

The Method for Improving the USBL Positioning System

2010 ◽  
Author(s):  
Yu Min
Keyword(s):  
Phase Shift ◽  
High Precision ◽  
Good Accuracy ◽  
Least Squares Method ◽  
Measuring Error ◽  
Short Baseline ◽  
Precision Phase ◽  
Positioning Algorithm ◽  
Additional Phase Shift ◽  
Additional Phase

This paper addresses a problem of estimating the precision phase-shift between the transducers of an Ultra short baseline (USBL) array. Due to fact that the performance of the traditional USBL system would evidently decline as the position error increases with the range, the paper at first proposed a high-precision positioning algorithm applied to an improved array to overcome this problem. Besides, employing a least-squares method, the additional phase shift between the transducers are also considered to be determined experimentally by rotating the USBL array in an acoustic test tank, which furthermore reduces the phase shift measuring error. Some trials results show that the proposed high-precision algorithm with improved array can be achieved with good accuracy, as well as the alignment phase shift offset.

scholarly journals NURBS Interpolator With Pre-compensation Based on Discrete Inverse Transfer Function for CNC High-precision Machining

2021 ◽  
Author(s):  
Taiyong Wang ◽  
Libo Cao ◽  
Yongbin Zhang ◽  
Jingchuan Dong ◽  
Songhui Jia ◽  
...  
Keyword(s):  
Steady State ◽  
Transfer Function ◽  
High Precision ◽  
Drive System ◽  
Precision Machining ◽  
Contour Error ◽  
Machining Accuracy ◽  
Steady State Response ◽  
Nurbs Interpolator ◽  
State Response

Abstract In the field of CNC machining, high-speed and high-precision machining has been regarded as the key research by many scholars. In conventional methods, high-speed machining and high-precision machining are contradictory. It is inevitable to reduce the feedrate to improve the processing accuracy. In the paper, a pre-compensation based on discrete inverse transfer function (PDIT) theory is proposed. PDIT is able to improve machining accuracy by reducing contour errors without decreasing feedrate. The proposed PDIT theory is divided into three parts, NURBS interpolator, feedrate scheduling, and interpolator with pre-compensation. The NURBS interpolator has greatly advantage to interpolate the parameter curve directly. Therefore, the paper adopts the NURBS interpolator to accomplish interpolation. In the feedrate scheduling, S-type flexible acceleration and deceleration are used for path planning, and the maximum starting feedrate is obtained with the feedrate constraint. In the interpolator with pre-compensation, the NURBS interpolator is pre-compensated by PDIT. For inputs, the response of transfer function reach steady-state response with a little time. Before reaching steady-state response, the unsteady response exists in the transfer function. The unsteady response usually sustains tens of interpolation periods and must be lead contour error in machining. Hence, the PDIT theory is employed to compensate the contour error causing by the unsteady response of transfer function to NURBS interpolator. The drive system is a transfer function, so the unsteady response of drive system cause machining errors before reaching the steady-state response. In the paper, the NURBS interpolator is pre-compensated by PDIT theory before the drive system to reduce contour errors and improve machining accuracy. Finally, the performance of the proposed PDIT is evaluated by simulation experiments. The experimental results illustrate that PDIT theory obviously improve the machining accuracy and reduces the contour error.

scholarly journals Adaptive short term COVID-19 prediction for India

2020 ◽  
Author(s):  
Shuvrangshu Jana ◽  
Debasish Ghose
Keyword(s):  
Detailed Analysis ◽  
Good Accuracy ◽  
Data Driven ◽  
Adaptive Model ◽  
Short Term ◽  
Term Prediction ◽  
Short Term Prediction

In this paper, a data-driven adaptive model for infection of COVID-19 is formulated to predict the confirmed total cases and active cases of an area over 4 weeks. The parameter of the model is always updated based on daily observations. It is found that the short term prediction of up to 3-4 weeks can be possible with good accuracy. Detailed analysis of predicted value and the actual value of confirmed total cases and active cases for India from 1st June to 3rd July is provided. Prediction over 7, 14, 21, 28 days has the accuracy about 0.73% ± 1.97%, 1.92% ± 2.95%, 4.34% ± 3.91%, 6.40% ± 9.26% of the actual value of confirmed total cases. Similarly, the 7, 14, 21, 28 days prediction has the accuracy about 1.24% ± 6.57%, 3.04% ± 10%, 6.33% ± 16.12%, 10.2% ± 24.14% of the actual value of confirmed active cases.

scholarly journals Errors in high precision source position determination

1991 ◽  
Vol 131 ◽  
pp. 307-311
Author(s):  
Pedro Elosegui ◽  
Juan-Maria Marcaide ◽  
Irwin I. Shapiro
Keyword(s):  
Detailed Analysis ◽  
High Precision ◽  
Proper Motion ◽  
Systematic Errors ◽  
Source Position ◽  
Position Determination ◽  
The Core ◽  
Vlbi Observations

AbstractWe have made a detailed analysis of the systematic errors in the determination, from two sets of VLBI observations, of the position of the quasar 1038+528 A relative to the quasar 1038+528 B. This analysis confirms an apparent proper motion at λ=3.6cm of 26±8 μas/yr of the core of the quasar 1038+528 A relative to the quasar 1038+528 B.

Coupled Rocking and Lateral Vibrations of Embedded Footings

1973 ◽  
Vol 10 (2) ◽  
pp. 145-160 ◽  
Author(s):  
C. M. Urlich ◽  
R. L. Kuhlemeyer
Keyword(s):  
Steady State ◽  
Numerical Model ◽  
Half Space ◽  
Good Accuracy ◽  
Elastic Half Space ◽  
Spring Constant ◽  
Lateral Vibrations

A numerical model is described that was utilized to solve the problem of steady state coupled rocking and lateral vibrations of footings embedded into an elastic half space. The good accuracy of the model is confirmed by comparing results obtained for footings founded on the surface of the half space with corresponding results obtained by Veletsos and Wei (J. Soil Mech. Found. Div. Am. Soc. Civ. Eng. 97, pp. 1227–1249, 1971). The results indicate that embedded footings behave dynamically in a manner that cannot be properly predicted by the use of an appropriate embedded footing static spring constant in conjunction with displacement functions obtained for surface footings.

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