scholarly journals Influence of Flow Disturbances behind the 90° Bend on the Indications of the Ultrasonic Flow Meter with Clamp-On Sensors on Pipelines

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 868
Author(s):  
Piotr Synowiec ◽  
Artur Andruszkiewicz ◽  
Wiesław Wędrychowicz ◽  
Piotr Piechota ◽  
Elżbieta Wróblewska
Keyword(s):  
Correction Factor ◽  
Measurement Errors ◽  
Laser Doppler Anemometry ◽  
Reynolds Numbers ◽  
Flow Meter ◽  
Flow Disturbances ◽  
Measurement Plane ◽  
Ultrasonic Flow Meter ◽  
The Subject ◽  
The Given

The subject matter of the article concerns velocities/flow rate measurements in the area of disturbed flows-behind the 90° bend. They were conducted by means of an ultrasonic flowmeter with clamp-on sensors on pipeline, for water and two different Reynolds numbers of 70,000 and 100,000, corresponding to two velocities of approximately 1.42 m/s and 2.04 m/s. The tests were carried out at 12 distances from the disturbance. Sensors on the circumference of the pipeline were mounted 30° each. The correction factor values were calculated for the given measurement geometry. The measurements have shown that the values of this coefficient are always greater than 1, which means that the ultrasonic flow meter understates the speed values. They also showed that already at a distance of 8 nominal diameters from the disturbance, the correction factor does not exceed 1.02, so the measurement errors are within the maximum permissible error (MPE) of a typical ultrasonic flow meter. For distances less than eight nominal diameters from the disturbance, not taking the correction factor value into the account can lead to systematic errors of up to 10.8%. Studies have also proved that in each measurement plane behind the disturbance there are two mounting angles for the ultrasonic sensors, 60° and 240° respectively, for which the correction factor values are minimal. Additionally, using the laser Doppler anemometry (LDA) method, velocity solids were determined at individual distances from the disturbance, and the projections of velocity blocks on the appropriate plane represented velocity profiles and indicated the distances from the disturbance at which these profiles stabilise.

Nonlinear Trend Analysis of Mill Fan System Vibrations for Predictive Maintenance and Diagnostics

2012 ◽  
Vol 58 (4) ◽  
pp. 351-356
Author(s):  
Mincho B. Hadjiski ◽  
Lyubka A. Doukovska ◽  
Stefan L. Kojnov
Keyword(s):  
Power Plant ◽  
Trend Analysis ◽  
Thermal Power Plant ◽  
Power Plants ◽  
Thermal Power ◽  
Balkan Peninsula ◽  
Predictive Maintenance ◽  
Nonlinear Trend ◽  
The Subject ◽  
The Given

Abstract Present paper considers nonlinear trend analysis for diagnostics and predictive maintenance. The subject is a device from Maritsa East 2 thermal power plant a mill fan. The choice of the given power plant is not occasional. This is the largest thermal power plant on the Balkan Peninsula. Mill fans are main part of the fuel preparation in the coal fired power plants. The possibility to predict eventual damages or wear out without switching off the device is significant for providing faultless and reliable work avoiding the losses caused by planned maintenance. This paper addresses the needs of the Maritsa East 2 Complex aiming to improve the ecological parameters of the electro energy production process.

Mobile-Friendly Dashboards to Display Associations Between Cited-by and Similar Journals on Mobile Health Research: A Bibliometric Study (Preprint)

2018 ◽  
Author(s):  
Tsair-Wei Chien ◽  
Hsien-Yi Wang ◽  
Yang Shao ◽  
Willy Chou
Keyword(s):  
Social Network ◽  
Mobile Health ◽  
Health Research ◽  
Similarity Criteria ◽  
Network Density ◽  
Deep Insight ◽  
Density Indices ◽  
The Subject ◽  
The Given ◽  
Insight Into

BACKGROUND Researchers often spend a great deal of time and effort retrieving related journals for their studies and submissions. Authors often designate one article and then retrieve other articles that are related to the given one using PubMed’s service for finding cited-by or similar articles. However, to date, none present the association between cited-by and similar journals related to a given journal. Authors need one effective and efficient way to find related journals on the topic of mobile health research. OBJECTIVE This study aims (1) to show the related journals for a given journal by both cited-by and similarity criteria; (2) to present the association between cited-by and similarity journals related to a given journal; (3) to inspect the patterns of network density indices among clusters classified by social network analysis (SNA); (4) to investigate the feature of Kendall's coefficient(W) of concordance. METHODS We obtained 676 abstracts since 2013 from Medline based on the keywords of ("JMIR mHealth and uHealth"[Journal]) on June 30, 2018, and plotted the clusters of related journals on Google Maps by using MS Excel modules. The features of network density indices were examined. The Kendall coefficient (W) was used to assess the concordance of clusters across indices. RESULTS This study found that (1) the journals related to JMIR mHealth and uHealth are easily presented on dashboards; (2) a mild association(=0.14) exists between cited-by and similar journals related to JMIR mHealth and uHealth; (3) the median Impact Factor were 3.37 and 2.183 based on the representatives of top ten clusters grouped by the cited-by and similar journals, respectively; (4) all Kendall’s coefficients(i.e., 0.82, 0.89, 0.92, and 0.75) for the four sets of density centrality have a statistically significant concordance (p < 0.05). CONCLUSIONS SNA provides deep insight into the relationships of related journals to a given journal. The results of this research can provide readers with a knowledge and concept diagram to use with future submissions to a given journal in the subject category of Mobile Health Research. CLINICALTRIAL Not available

Proses Berpikir Kreatif Siswa Tipe Linguistik dalamPemecahan Masalah Biologi

2014 ◽  
Vol 2 (2) ◽  
Author(s):  
Imelda Aisah Sarip ◽  
Kamid Kamid ◽  
Bambang Hariyadi
Keyword(s):  
Problem Solving ◽  
Data Collection ◽  
Creative Thinking ◽  
Research Data ◽  
Think Aloud ◽  
The Subject ◽  
Thinking Process ◽  
Problem Solving Process ◽  
The Given

The aim of this research is to describe creative thinking process of linguistic type student in biology problem solving. This research is conducted to linguistic intelligence type of subject at SMPN 6 Kota Jambi. SL the subject was selected based on the aim of the research. Data collection is conducted by interview and a modified think aloud method. Data is analyzed based on creative thinking process purposed by Polya.The result of this research shows that SL could find and arrange the given problems and collect data correctly and appropriately. The problem solving steps is done systematically to the end of problem solving process. The last steps problem solving, SL does checking while doing scratching to make sure that the written answers meet her need.

The Development of the Communication Skills of Individuals Living in Homes for People with Disabilities

2012 ◽  
Vol 2 (2) ◽  
pp. 56-70
Author(s):  
Petr Kopečný
Keyword(s):  
Czech Republic ◽  
Case Studies ◽  
Social Services ◽  
Communication Skills ◽  
Speech Therapy ◽  
People With Disabilities ◽  
Educational Support ◽  
The Czech Republic ◽  
The Subject ◽  
The Given

This paper concentrates on the area of special educational support provided to individuals living in homes for people with disabilities in the Czech Republic and presents partial research results illustrating the state of the provision of speech therapy to users of social services facilities falling under the jurisdiction of the Ministry of Labour and Social Affairs. The subject of the research is an analysis of support for the development of the communication skills of pupils living in social services facilities. The partial results of the research outline the approaches employed by the managerial staff of the given facilities in implementing special educational procedures, describe forms of speech therapy provision in homes for people with disabilities, and compare the attitudes of teachers and social services staff to the development of communication with the importance attributed to it by speech therapists and demonstrated by the case studies performed.

Attenuation of Flow Disturbances in Tapered Arterial Grafts

1989 ◽  
Vol 111 (4) ◽  
pp. 303-310 ◽  
Author(s):  
R. A. Black ◽  
T. V. How
Keyword(s):  
Pulsatile Flow ◽  
Reynolds Numbers ◽  
Axial Distance ◽  
Pulsed Ultrasound ◽  
Arterial Grafts ◽  
Vascular Prostheses ◽  
Disturbance Intensity ◽  
Flow Disturbances ◽  
Percent Area

Flow disturbances in tapered arterial grafts of angles of taper between 0.5 and 1.0 deg were measured in vitro using a pulsed ultrasound Doppler velocimeter. The increase in transition Reynolds numbers with angle of taper and axial distance was determined for steady flow. The instantaneous centerline velocities were measured distal to a 50 percent area stenosis (as a model of a proximal anastomosis), in steady and pulsatile flow, from which the disturbance intensities were calculated. A significant reduction in post-stenotic disturbance intensity was recorded in the tapered grafts, relative to a conventional cylindrical graft. In pulsatile flow with a large backflow component, however, there was an increase in disturbance intensity due to diverging flow during flow reversal. This was observed only in the 1.0 deg tapered graft. These findings indicate that taper is an important consideration in the design of vascular prostheses.

EL JUEZ COMPETENTE PARA CONOCER DEL PROCEDIMIENTO MONITORIO: CUESTIONES PRÁCTICAS

2010 ◽  
pp. 493-519
Author(s):  
AINHOA GUTIÉRREZ BARRENENGOA
Keyword(s):  
Subject Matter ◽  
Critical Review ◽  
Case Law ◽  
Territorial Jurisdiction ◽  
Procedural Code ◽  
The Subject ◽  
The Given

El procedimiento monitorio se concibe en la Ley 1/2000, de Enjuiciamiento Civil como un procedimiento de tutela privilegiada de determinados créditos. Sin embargo, estos postulados se contradicen con los problemas que, en la práctica forense, se han suscitado, en muchos casos, por la determinación de la competencia del órgano que debe conocer del procedimiento. En el presente estudio, se analizan las principales cuestiones que se han suscitado en relación con la determinación de la competencia objetiva y territorial en el procedimiento monitorio, con un repaso crítico de las distintas soluciones doctrinales aportadas, y una revisión de la última doctrina jurisprudencial en la materia. Prozedura monitorioa Prozedura Zibilaren 1/2000 Legeak taxutu zuen, zenbait kredituren tutoretza pribilejiatua izateko prozedura moduan. Hala eta guztiz ere, postulatu horiek ez datoz bat praktika forentsean sortu diren arazoekin; izan ere, maiz, prozedura ezagutu behar duen organoaren eskumena nork duen jakitea ez da gauza argia. Lan honetan, prozedura monitorioaren inguruan eskumen objektiboa eta lurraldekoa zehaztu beharraz sortu diren eztabaida nagusiak aztertzen dira, horri buruz agertu izan diren konponbide doktrinalen azterketa kritikoa eginez, eta gaiari buruzko azken jurisprudentzia-doktrina ere lantzen da. The payment procedure is envisaged by Act 1/2000 on the Civil Procedural Code as a procedure for a privileged guarantee of some debts. However, theses propositions conflict with the problems which arose in practice when deciding the subject-matter and territorial jurisdiction in payments procedures. By this study, main questions regarding the subject-matter and territorial jurisdiction within the payment procedure are analyzed with a critical review of the given different doctrinal solutions and a revision of the last case law doctrine on the topic.

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