scholarly journals Centrifugal Pump Monitoring and Determination of Pump Characteristic Curves Using Experimental and Analytical Solutions

Processes ◽  
2018 ◽  
Vol 6 (2) ◽  
pp. 18 ◽  
Author(s):  
Marius Stan ◽  
Ion Pana ◽  
Mihail Minescu ◽  
Adonis Ichim ◽  
Catalin Teodoriu
Keyword(s):  
Centrifugal Pump ◽  
Analytical Solutions ◽  
Characteristic Curves

scholarly journals Study of Dual Stator Induction Motor in Photovoltaic-Fuel Cell Hybrid Pumping Application

2020 ◽  
Vol 53 (5) ◽  
pp. 601-608
Author(s):  
Arezki Adjati ◽  
Toufik Rekioua ◽  
Djamila Rekioua ◽  
Abdelmounaim Tounzi
Keyword(s):  
Fuel Cell ◽  
Induction Motor ◽  
Centrifugal Pump ◽  
Cell Hybrid ◽  
Double Star ◽  
Water Requirements ◽  
Matlab Simulink ◽  
Pumping System ◽  
Dynamic Head

This paper discusses the modeling of hybrid Photovoltaic/Fuel cell pumping. This system comprises a photovoltaic generator and a fuel cell, two DC/DC converters, two of inverters which supply a double star induction motor (DSIM) which drives the shaft of a centrifugal pump. The evaluation of the water requirements, the total dynamic head (TDH) and the flow are of great importance to evaluate the various powers allowing the determination of the size of the pumping system. The global proposed system is sized and simulated under Matlab/Simulink Package. The obtained results under different metrological conditions show the effectiveness of the proposed hybrid pumping system.

Use of the evaporative method for determination of soilless substrate moisture characteristic curves

2016 ◽  
Vol 211 ◽  
pp. 102-109 ◽  
Author(s):  
Jeb S. Fields ◽  
James S. Owen ◽  
Lin Zhang ◽  
William C. Fonteno
Keyword(s):  
Characteristic Curves ◽  
Moisture Characteristic ◽  
Substrate Moisture ◽  
Soilless Substrate

Determination of Reliability of Rotor-Annular Seals System by Theory of Runs of Random Functions

2014 ◽  
Vol 630 ◽  
pp. 350-355
Author(s):  
Yulia Tarasevich ◽  
Anna Savchenko
Keyword(s):  
Centrifugal Pump ◽  
Random Vector ◽  
System Reliability ◽  
Erosive Wear ◽  
Quality System ◽  
Random Functions ◽  
Random Forcings ◽  
Annular Seals

The paper discusses forced combined angular-radial oscillations of rotor centrifugal pump model under the influence of random forcings. System reliability is evaluated using the theory of random functions runs: the probability of finding a random vector of quality system “rotor-annular seals” in the range of admissible values of its parameters is determined. Evaluation of the influence of erosive wear of sealing surfaces in the process of pump operating on reliability system is made.

A Basis for Teaching Centrifugal Pump Characteristics in an Undergraduate Course in Turbomachinery

2005 ◽  
Vol 33 (4) ◽  
pp. 283-293 ◽  
Author(s):  
Nzumbe-Mesape Ntoko ◽  
Kamdem Djidjou ◽  
Ndetan Harrison
Keyword(s):  
Centrifugal Pump ◽  
Key Factors ◽  
Pump Impeller ◽  
Frictional Loss ◽  
The Real ◽  
Loss Coefficients ◽  
The Difference ◽  
Centrifugal Pump Impeller

The paper presents a basis for teaching centrifugal pump characteristics in an undergraduate course in turbomachinery. It is shown how the shock and frictional loss coefficients, key factors in the determination of pump characteristics, can be appropriately obtained. The first coefficient is obtained from the difference between the drag at a reference incidence and that at zero incidence, while the second is obtained from correlations for frictional loss in a spiral. The coefficients so obtained were used to obtain the real characteristics of a centrifugal pump impeller.

scholarly journals Characteristic Curves and Criterion of Critical Difference in Assessing the Informativeness of Markers of Renal Damage in Lithotripsy

2021 ◽  
Vol 9 (4) ◽  
pp. 593-597
Author(s):  
R. S. Iskhakova ◽  
A. G. Gilmanov
Keyword(s):  
Renal Injury ◽  
Control Group ◽  
Diagnostic Efficiency ◽  
Critical Difference ◽  
Diagnostic Significance ◽  
Diagnostic Efficacy ◽  
Characteristic Curves ◽  
Injury Characteristic ◽  
First Session

Aim of study. Determination of the diagnostic significance of laboratory biomarkers of renal tissue damage in remote nephrolithotripsy in patients with urolithiasis.Material and methods. On the basis of the urology department of the Republican Clinical Hospital (Ufa), 35 patients with urolithiasis were examined, who underwent remote shock wave lithotripsy sessions. The laboratory parameters were determined in patients: the number of erythrocytes, leukocytes in the blood, the level of lipocalin and microalbumin in the urine, as well as alpha2-microglobulin and cystatin C in the blood serum. The control group included 14 healthy donors. To determine the diagnostic efficacy of biomarkers of renal injury, characteristic curves were plotted, and lipocalin level shifts were interpreted taking into account the data on the critical difference criterion value.Results. When studying the urinary level of lipocalin in patients with urolithiasis, it was found that the difference in the concentration of the biomarker in them and in healthy individuals is statistically insignificant (0.68 pg/ml versus 0.4 pg/ml). After the first session of extracorporeal lithotripsy, an increase in urinary excretion of lipocalin by 5 times is noted, after the second - by an additional 1.6 times, and after the third - by another 1.7 times (the differences are statistically significant). To analyze the prognostic efficiency of markers of renal injury, characteristic curves were plotted. The area under the ROC curve for lipocalin varied from 0.77 to 0.80 depending on the number of sessions, which indicates a high diagnostic efficiency of this biomarker. The determination of the criterion of critical difference (CCD) showed that an increase in the level of lipocalin in the urine after the first session of lithotripsy more than 2.1 times is statistically significant. The concentration of the specified biomarker in urine exceeding 4.5 pg/ml, 6 pg/ml and 10 pg/ml after the first, second and third sessions of lithotripsy, respectively, can be considered as a basis for changing treatment tactics (delaying the second procedure) or performing lithotripsy in another way.Conclusion. Urinary lipocalin, associated with neutrophil gelatinase, is an informative biomarker of renal injury in the assessment of complications associated with the lithotripsy procedure.

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