scholarly journals A STUDY OF THE APPLICATION OF VOLUMETRIC COMPENSATION BY DIRECT AND INDIRECT MEASUREMENT METHODS

2019 ◽  
Vol 2019 (04) ◽  
pp. 3035-3040
Author(s):  
M. Holub ◽  
J. Knobloch ◽  
T. Marek
2020 ◽  
Vol 87 (s1) ◽  
pp. s79-s84
Author(s):  
Qummar Zaman ◽  
Senan Alraho ◽  
Andreas König

AbstractThe conventional method for testing the performance of reconfigurable sensory electronics of industry 4.0 relies on the direct measurement methods. This approach gives higher accuracy but at the price of extremely high testing cost and does not utilize the new degrees of freedom for measurement methods enabled by industry 4.0. In order to reduce the test cost and use available resources more efficiently, a primary approach, called indirect measurements or alternative testing has been proposed using a non-intrusive sensor. Its basic principle consists in using the indirect measurements, in order to estimate the sensory electronics performance parameters without measuring directly. The non-intrusive property of the proposed method offers better performance of the sensing electronics and virtually applicable to any sensing electronics. Efficiency is evaluated in terms of model accuracy by using six different classical metrics. It uses an indirect current-feedback instrumentation amplifier (InAmp) as a test vehicle to evaluate the performance parameters of the circuit. The device is implemented using CMOS 0.35 μm technology. The achieved maximum value of average expected error metrics is 0.24, and the lowest value of correlation performance metrics is 0.91, which represent an excellent efficiency of InAmp performance predictor.


1981 ◽  
Vol 8 (3) ◽  
pp. 257-267 ◽  
Author(s):  
Gregory J. Buhyoff ◽  
Linda K. Arndt ◽  
Dennis B. Propst

2019 ◽  
Vol 23 (3) ◽  
pp. 578-583
Author(s):  
YC He ◽  
JCK Cheung ◽  
QS Li ◽  
JY Fu

The reference wind speed and reference static pressure are two key parameters for determining the testing results of wind tunnel experiments. Traditionally, the values of these parameters can be determined using direct measurement methods. However, such methods may suffer from less accuracy and inconvenience of operations. This article documents an indirect measurement method which, compared to the traditional methods, has the merits of higher accuracy and greater operational convenience. Examples are presented to demonstrate the main procedures of the method and typical findings by using the method in a boundary layer wind tunnel.


1998 ◽  
Vol 540 ◽  
Author(s):  
D. Ila ◽  
E. K. Williams ◽  
D. B. Poker ◽  
D. K. Hensley ◽  
C. Klatt ◽  
...  

AbstractIn this paper, we present the results of our investigation of producing nanoclusters of gold in silica at fluences of two orders of magnitude less than what is traditionally used This is accomplished by implanting 2.0 MeV Au into silica followed by MeV bombardment by MeV Si ions. The size of the nanoclusters, ranging from one to 10 nanometers, is controlled by the implantation dose and by the total electronic energy deposited by each post bombarding ion in the implanted layer. By both indirect measurement methods, such as optical absorption spectrophotometry (non-destructive), and direct methods, such as transmission electron microscopy (destructive) we show how and at what concentrations gold nucleates to form nanoparticles by radiation-enhanced nucleation at a dose below that needed for spontaneous nanoparticle formation.


Nanoscale ◽  
2018 ◽  
Vol 10 (47) ◽  
pp. 22270-22279 ◽  
Author(s):  
Jingyu Liu ◽  
Fan Zhang ◽  
Andrew J. Allen ◽  
Aaron C. Johnston-Peck ◽  
John M. Pettibone

Reported reaction kinetics of metal nanoparticles in natural and engineered systems commonly have used proxy measurements to infer chemical transformations, but extension of these methods to complex media has proven difficult.


2013 ◽  
Vol 446-447 ◽  
pp. 1134-1137 ◽  
Author(s):  
Chun Lei Wu ◽  
Lian Fa Yang ◽  
Yu Lin He

Friction at the interface of die and workpiece plays an important role in metal forming. This paper introduces measurement methods of friction coefficient at curved surface in recent years, and divides the friction coefficient measurement methods into direct measurement methods and indirect measurement methods. Furthermore, the working principles and technical characteristics of these methods are explained.


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