Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 27 for “"flowmeter"”.
-
A blood-perfusion flowmeter
A variety of methods have been used for measuring blood flow in large vessels. However, almost all of these methods are unsuitable for measuring perfusion flow in tissue. Basically all attempts at perfusion flow measurement have used either a tracer method (radio-active dyes, microspheres) or a …
-
An investigation into fieldbus and its incorporation in the design of an electronic flowmeter
… Stockport. They have a design for an electronic flowmeter which, while successful in the past, is now suffering reduced sales due to the cost and inflexibility of the design. This device was redesigned to reduce cost and improve performance which, along with the incorporation of Fieldbus …
-
A coal-air flowmeter for measuring the air-fuel ratio in a pulverized coal carrying pipe line
… is to design, build, and calibrate a coal-air flowmeter to operate in a pipe line through which a mixture of powdered coal and air are being blown; and to investigate the accuracy of the meter while operating at different air-fuel ratios. It is the authors intention to test the coal-air …
-
Performance prediction model for positive displacement helical screw flowmeters
… the performance of positive displacement flowmeters. This model allows to predict the performance of any positive displacement meter if 8 coefficients describing the meter design are known. The logic is that a flowmeter performs at a defined pressure loss for a given speed. This pressure …
-
Rotating Vane Flow Measurement Techniques
… into the development and performance of vane flowmeter methods for the measurement of air and gas flow. To improve on existing rotating vane anemometer performance, a capacitance change vane sensing technique is investigated. In conjunction with Ower's dynamic equations steady state and step …
-
Scaffold Permeability as a Means to Determine Fiber Diameter and Pore Size of Electrospun Fibrinogen
The purpose of this study was to construct a flowmeter that could accurately measure the hydraulic permeability of electrospun fibrinogen scaffolds, providing insight into the transport properties of electrospun scaffolds while making the measurement of their topographical features (fiber and pore …
-
The measurement of flow velocity distribution
… and accuracy achieved by the cross-correlation flowmeter is investigated. The principles of the flowmeter operation and fundamental digital signal processing techniques are reviewed. The process of the Fourier transform deconvolution is investigated. Computer simulation of the flow system is …
-
Slurry flowmetering using correlation techniques
A review of slurry flowmeters leads to the conclusion that most are unsuited for measuring the flowrate of abrasive and corrosive slurries such as are found in the gold mining industry in South Africa. An alternative flowmeter based on cross-correlation techniques is thus proposed. Random signals …
-
Fluid flow measurement using correlation techniques
… of pulsating laminar flow. Only if KR<1 can the flowmeter, calibrated for steady flow measurement, meter pulsating flow accurately. This condition is satisfied easily by highly viscous liquids and hence this method is an accurate method for metering highly viscous liquids under pulsating flow …
-
The development of biomedical instrumentation using backscattered laser light
… An investigation of the responses of Doppler flowmeters using different signal processing bandwidths and laser sources revealed two major findings. Firstly, that careful choice of processing bandwidth is required in order to sample the whole range of possible Doppler frequencies present in the …
-
The morphological, flow and failure characteristics of fractionated natural bulk material. Evaluation of flowability of fractionated powdered liquorice using a specially designed flowmeter. The particle morphology was assessed by computer image analysis and the failure properties by shear cell testing.
… using a specially designed inclined tube flowmeter. The failure properties of powdered liquorice when sheared under known normal compressive stresses were measured and from a series of yield loci the unconfined yield strength, major consolidation stress and effective angle of internal …
-
An experimental analysis of heat transfer in coiled tubes
… in coiled tubes was attempted using magnetic flowmeters. This approach was not successful and yielded only preliminary qualitative information as a result of an unexpected experimental problem. Recommendations are presented for an improved flowmeter design that could be used for future …
-
ΣΥΜΒΟΛΗ ΕΙΣ ΤΗΝ ΜΕΛΕΤΗΝ ΤΩΝ ΜΕΤΑΒΟΛΩΝ ΤΗΣ ΑΙΜΑΤΩΣΕΩΣ ΤΟΥ ΜΥΟΚΑΡΔΙΟΥ ΕΠΙ ΦΥΣΙΟΛΟΓΙΚΩΝ ΚΑΙ ΕΣΤΕΝΩΜΕΝΩΝ ΣΤΕΦΑΝΙΑΙΩΝ ΑΓΓΕΙΩΝ ΚΑΤΟΠΙΝ ΑΥΞΗΣΕΩΣ ΤΗΣ ΚΑΡΔΙΑΚΗΣ ΣΥΧΝΟΤΗΤΟΣ
… OF THE VESSEL, CONTROLLED BY AN ELECTROMAGNETIC FLOWMETER WAS DIMINISHED BY 50%. THE STUDY OF MYOCARDIAL BLOOD FLOW WAS CARRIED OUT ON SEGMENTS OF THE ANTERIOR AND POSTERIOR WALL OF THELEFT VENTRICLE, THE DIAPHRAGM AND THE RIGHT VENTRICLE. THE PRESSURE OF THE LEFT VENTRICLE AS WELL AS THE …
-
A transient heat probe sensor for measuring transpiration in the stem of woody plants.
… the single heated thermistor is able to work as flowmeter since its transient thermal response was affected by the local fluid flow. The natural logarithm of the fractional response of the thermistor probe indicated that the system can not be analysed as a first order model. Non-linear regression …
-
Mathematical Evaluation of Steady, Laminar Flow by the use of Continuous-Wave (CW) Doppler and Pitot Tube System
… acoustical signal from the Doppler ultrasonic flowmeter, is being conducted. The purpose was to determine some of the hemodynamic influences on the spectrum. The hypothesis was that both hematocrit and pressure head influence the amplitude of the spectrum. Experiments were designed to: a) …
-
Untersuchungen junger Grundwässer mit Hilfe anthropogener Spurenstoffe
… der Wasserscheide mit einem ungeeichten Impeller-Flowmeter wurde entwickelt und die Ergebnisse mit Messungen eines heat pulse flowmeters verglichen. Im zweiten Teil wurden drei Fallstudien zur Datierung junger Grundwässer mit Hilfe mehrerer anthropogen erzeugter Spurenstoffe durchgeführt. Dabei …
-
Beeinflussung der akuten Entzündung durch Gentianaviolett, Eosin und Unguentum polyenthylenglycoli
… das Entzündungsausmaß (Periflux 2 Laser Doppler Flowmeter). <br>Die Auswertung erfolgte mit dem Wilcoxon-Test für Paardifferenzen. <br>Methylrosaniliniumchlorid NRF 11.69 hat zur Hydratation der Haut (Corneo-metrie p< 0,05) und zur schnelleren Regeneration der Hautbarriere (TEWL p < 0,01) …
-
Multicomponent continuous flow kinetic analysis
… improve the accuracy of the determinations. The flowmeter and flow controller are potential alternatives to the relatively expensive pumps used for flow injection analysis. Evaluation of the instrument’s operation in flow injection mode indicates that it is useful as a convenient continuous flow …
-
Multiphysics modelling of geometrically-complex flow metering devices
… flow phenomena inside a prototype industrial flowmeter, demonstrating excellent agreement with experimental observations and showing that the framework can be used to inform the engineering design of flow control devices. Finally, the flexibility of the software was exploited to incorporate a …
-
Two-Phase Flow Measurement using Fast X-ray Line Detector System
… the double-sensor conductivity probe and gas flowmeter for various flow conditions. The results show reasonable agreements between the x-ray and the other measurement techniques. Finally, various 2-D tomography algorithms are implemented for the non-axisymmetric two-phase flow reconstruction. …
Page 1 of 2