Progress of acoustic microscopy reviewed with a history of ultrasonic measurement technology in Japan

1990 ◽  
Vol 23 (1) ◽  
pp. 45
Keyword(s):  
Ultrasonic Measurement ◽  
Acoustic Microscopy ◽  
Measurement Technology ◽  
History Of

Source Guide to History of Measurement Technology Material

1978 ◽  
Vol 11 (3) ◽  
pp. 103-116 ◽  
Author(s):  
P. H. Sydenham
Keyword(s):  
Measurement Technology ◽  
History Of

The two-section guide provides a brief summary of the history of sensing, a working guide to dominate world collections of sensing apparatus and an introductory guide to the literature available on sensing methods. It is intended as an aid to historical sensing technique research. Part 2 relates to the material available in the printed medium. Part 1, giving an introduction and covering artifact collections, was published in the July 1977 issue.

scholarly journals Investigation of Online Corrosion Monitoring for Grounding Materials Based on Electromagnetic Ultrasonic Technology

CONVERTER ◽  
2021 ◽  
pp. 342-346
Author(s):  
Xiaolin Li, Et al.
Keyword(s):  
Monitoring System ◽  
Thickness Measurement ◽  
Ultrasonic Measurement ◽  
Measurement Technology ◽  
Corrosion Monitoring ◽  
Monitoring Methods ◽  
Ultrasonic Technology ◽  
Ultrasonic Thickness Measurement ◽  
Ultrasonic Thickness ◽  
Corrosion Data

Power grounding is a key aspectofensuringsafety in power facilities.However, the corrosion of grounding materials can cause accidentsduringpower facility operation. Therefore, monitoring the corrosion status of grounding materials can eliminate hidden risks in the grounding network and ensure safe poweroperation. In this paper, electromagnetic ultrasonic thickness measurement technology was used to develop an online corrosion monitoring system for grounding materials via the installation of electromagnetic ultrasonic measurement probes on in-service power grounding materials. The results from a substation grounding networkdemonstrate that the online corrosion monitoring system can obtain more precise grounding corrosion data and has more extensive application prospects compared with other monitoring methods.

Source Guide to History of Measurement Technology Material

1977 ◽  
Vol 10 (7) ◽  
pp. 257-265
Author(s):  
P. H. Sydenham
Keyword(s):  
19Th Century ◽  
Measurement Technology ◽  
Written Information ◽  
Electrical Devices ◽  
History Of ◽  
High Degree ◽  
The 19Th Century

Measurement hardware before the 19th century is reasonably well reported in historical works. More modern electrical devices have not been studied as extensively, presumably because of the high degree of understanding needed of the historian and because the artifacts and written information are not easy to locate. This article provides a brief summary of the history of sensing, a working guide to dominant world collections of sensing apparatus, and an introductory guide to the literature available on sensing methods. It is intended as an aid to historical sensing technique research.

scholarly journals ULTRASONIC MEASUREMENT TECHNOLOGY IN AUTOMATED CONTROL OF WATER RESOURCES

2021 ◽  
pp. 37-41
Author(s):  
Іryna Gryshanova
Keyword(s):  
Water Resources ◽  
Measurement Theory ◽  
Ultrasonic Measurement ◽  
Measurement Technology ◽  
Water Control ◽  
Control Cost ◽  
Automated Control ◽  
Flow Meters ◽  
Factors Affecting ◽  
Rough Water

Control of water resources is becoming an important strategic issue. That is why authorities set the goal for wa-ter agencies to manage the availability of water and create regulations to its rational use. The main point in water control is measurement. There are three important aspects of measurements of water resources: at water extraction from nature, at the consumption and at custody transfer. Control of water consumption sometimes is based not on measurements, but on preliminary estimation, for example, by pumping. Ultrasonic measurement technology as a key feature of automated control of resources has a potential role in this market. In contrast to mechanical (turbine) meters, ultrasonic meters have a priority because they also give a possibility to realize smart metering. In contrast to electromagnetic meters, which also measure with high accuracy and realize smart functions, ultrasonic meters much more suitable for rough water, wastewater and sewage. Such water resources are usually poorly controlled, which means that no one knows their exact cost. Measurement is mandatory to control cost and for billing. Accuracy is important issue, especially when we say about measurements in large pipe diameters. There is practically no alternative to ultrasonic flow meters. Market of diverse meters concentrated on diameters under 400 mm. For larger diameters, only ultrasonic meters are in use. They have many chords, difficult algorithms for data processing. Thus, they are applicable over a very wide flow range. In this paper, we discover transit-time ultrasonic flow meters to understand features of their measurement theory taking into account all factors affecting their work. This article describes errors inherent in these flowmeters during measurements. As far as accuracy is significantly important in billing, the cost of 1% measurement error in consumption of water resources for small (DN50÷DN150 mm) and large (DN200÷DN1200 mm) pipe diameters has been evaluated and analyzed. The losses from the installation of low-quality metering devices are demonstrated and discussed.

scholarly journals Investigating the impact of COVID-19 lockdown on adults with a recent history of recurrent major depressive disorder: a multi-Centre study using remote measurement technology

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Daniel Leightley ◽  
Grace Lavelle ◽  
Katie M. White ◽  
Shaoxiong Sun ◽  
Faith Matcham ◽  
...  
Keyword(s):  
Major Depressive Disorder ◽  
Depressive Symptoms ◽  
Sleep Duration ◽  
Self Esteem ◽  
Measurement Technology ◽  
Remote Measurement ◽  
Major Depressive ◽  
Multi Centre Study ◽  
History Of ◽  
The Impact

Abstract Background The outbreak of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which causes a clinical illness Covid-19, has had a major impact on mental health globally. Those diagnosed with major depressive disorder (MDD) may be negatively impacted by the global pandemic due to social isolation, feelings of loneliness or lack of access to care. This study seeks to assess the impact of the 1st lockdown – pre-, during and post – in adults with a recent history of MDD across multiple centres. Methods This study is a secondary analysis of an on-going cohort study, RADAR-MDD project, a multi-centre study examining the use of remote measurement technology (RMT) in monitoring MDD. Self-reported questionnaire and passive data streams were analysed from participants who had joined the project prior to 1st December 2019 and had completed Patient Health and Self-esteem Questionnaires during the pandemic (n = 252). We used mixed models for repeated measures to estimate trajectories of depressive symptoms, self-esteem, and sleep duration. Results In our sample of 252 participants, 48% (n = 121) had clinically relevant depressive symptoms shortly before the pandemic. For the sample as a whole, we found no evidence that depressive symptoms or self-esteem changed between pre-, during- and post-lockdown. However, we found evidence that mean sleep duration (in minutes) decreased significantly between during- and post- lockdown (− 12.16; 95% CI − 18.39 to − 5.92; p <  0.001). We also found that those experiencing clinically relevant depressive symptoms shortly before the pandemic showed a decrease in depressive symptoms, self-esteem and sleep duration between pre- and during- lockdown (interaction p = 0.047, p = 0.045 and p <  0.001, respectively) as compared to those who were not. Conclusions We identified changes in depressive symptoms and sleep duration over the course of lockdown, some of which varied according to whether participants were experiencing clinically relevant depressive symptoms shortly prior to the pandemic. However, the results of this study suggest that those with MDD do not experience a significant worsening in symptoms during the first months of the Covid − 19 pandemic.

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