Relevant bibliographies by topics / Non-dimensional parameters

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Non-dimensional parameters'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Non-dimensional parameters"

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Chatoorgoon, V., S. Yeylaghi, and L. Leung. "ICONE19-44057 A Study of Non-Dimensional Parameters for the Oscillatory Instability Boundary In Supercritical Flow." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2011.19 (2011): _ICONE1944. http://dx.doi.org/10.1299/jsmeicone.2011.19._icone1944_24.

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Yousif, Ali, Sadeq Sulaiman, Lamine Diop, Mohammad Ehteram, Shamsuddin Shahid, Nadhir Al-Ansari, and Zaher Yaseen. "Open Channel Sluice Gate Scouring Parameters Prediction: Different Scenarios of Dimensional and Non-Dimensional Input Parameters." Water 11, no. 2 (February 19, 2019): 353. http://dx.doi.org/10.3390/w11020353.

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The determination of scour characteristics in the downstream of sluice gate is highly important for designing and protection of hydraulic structure. The applicability of modern data-intelligence technique known as extreme learning machine (ELM) to simulate scour characteristics has been examined in this study. Three major characteristics of scour hole in the downstream of a sluice gate, namely the length of scour hole (Ls), the maximum scour depth (Ds), and the position of maximum scour depth (Lsm), are modeled using different properties of the flow and bed material. The obtained results using ELM were compared with multivariate adaptive regression spline (MARS). The dimensional analysis technique was used to reduce the number of input variable to a smaller number of dimensionless groups and both the dimensional and non-dimensional variables were used to model the scour characteristics. The prediction performances of the developed models were examined using several statistical metrics. The results revealed that ELM can predict scour properties with much higher accuracy compared to MARS. The errors in prediction can be reduced in the range of 79%–81% using ELM models compared to MARS models. Better performance of the models was observed when dimensional variables were used as input. The result indicates that the use of ELM with non-dimensional data can provide high accuracy in modeling complex hydrological problems.
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HUANG, HEQING. "Non-dimensional parameters of depth-averaged gravity flow models." Journal of Hydraulic Research 47, no. 4 (2009): 000. http://dx.doi.org/10.3826/jhr.2009.3377.

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Bonert, Michael, and Bradley A. Saville. "A Non-Dimensional Analysis of Hemodialysis." Open Biomedical Engineering Journal 4, no. 1 (July 9, 2010): 138–55. http://dx.doi.org/10.2174/1874120701004010138.

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Background: Non-dimensional analysis is a powerful approach that can be applied to multivariate problems to better understand their behaviour and interpret complex interactions of variables. It is has not been rigorously applied to the parameters that define renal dialysis treatments and may provide insight into the planning of hemodialysis treatments. Methods: Buckingham’s non-dimensional approach was applied to the parameters that define hemodialysis treatments. Non-dimensional groups were derived with knowledge of a mass transfer model and independent of it. Using a mass transfer model, the derived non-dimensional groups were plotted to develop an understanding of key relationships governing hemodialysis and toxin profiles in patients with end-stage renal disease. Results: Three non-dimensional groups are sufficient to describe hemodialysis, if there is no residual renal function (RRF). The non-dimensional groups found represent (1) the number of half-lives that characterize the mass transfer, (2) the toxin concentration divided by the rise in toxin concentration without dialysis for the cycle time (the inverse of the dialysis frequency), and (3) the ratio of dialysis time to the cycle time. If there is RRF, one additional non-dimensional group is needed (the ratio between cycle time and intradialytic elimination rate constant). Alternate non-dimensional groups can be derived from the four unique groups. Conclusions: Physical interpretation of the non-dimensional groups allows for greater insight into the parameters that determine dialysis effectiveness. This technique can be applied to any toxin and facilitates a greater understanding of dialysis treatment options. Quantitative measures of dialysis adequacy should be based on dimensional variables.
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Wu, Shuang Ying, Xiao Feng Yuan, and You Rong Li. "Two non-dimensional exergy transfer performance parameters of heat exchanger." International Journal of Exergy 7, no. 1 (2010): 130. http://dx.doi.org/10.1504/ijex.2010.029619.

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Chatoorgoon, V. "Non-dimensional parameters for static instability in supercritical heated channels." International Journal of Heat and Mass Transfer 64 (September 2013): 145–54. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.04.026.

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Navarro-Peris, Emilio, José M. Corberán, Luigi Falco, and Israel O. Martínez-Galván. "New non-dimensional performance parameters for the characterization of refrigeration compressors." International Journal of Refrigeration 36, no. 7 (November 2013): 1951–64. http://dx.doi.org/10.1016/j.ijrefrig.2013.07.007.

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Lamont-Smith, T. "An empirical examination of the use of non-dimensional wave parameters." Waves in Random and Complex Media 30, no. 4 (December 5, 2018): 614–31. http://dx.doi.org/10.1080/17455030.2018.1549761.

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Palla, A., I. Gnecco, and L. G. Lanza. "Non-dimensional design parameters and performance assessment of rainwater harvesting systems." Journal of Hydrology 401, no. 1-2 (April 2011): 65–76. http://dx.doi.org/10.1016/j.jhydrol.2011.02.009.

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Kryshchuk, R. S. "INFLUENCE OF WINDING ENDS ON THE PARAMETERS OF PULSE INDUCTOR WITH U-SHAPED CORE." Tekhnichna Elektrodynamika 2020, no. 6 (October 21, 2020): 69–76. http://dx.doi.org/10.15407/techned2020.06.069.

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It is known from the scientific literature that magnetic pulse processing of electrically conductive non-magnetic sheet materials helps to reduce residual stresses, especially in welded joints. This is due to magnetoplastic and electroplastic effects. To create such effects in non-magnetic electrically conductive materials with welded joints, an inductor with pulsed magnetic field, U-shaped magnetic circuit and hollow conductor for possibility of active cooling of the winding is proposed. Such inductor allows inducing high-density pulsed currents in electrically conductive non-magnetic sheet materials with welded joints. It studies the parameters of the inductor - active resistance and inductance in the frequency-domain mode. The parameters calculated in two-dimensional and three-dimensional models are compared. The electromagnetic field is calculated using Maxwell equations and finite element method. Parameters of an ends of winding are determined by the difference in the parameters of the three-dimensional and two-dimensional models of the induction system. Resistance is calculated separately in the groove`s part of the winding, the outer part and on the frontal parts. The parameters of the induction system with a ferromagnetic core and non-magnetic thin-sheet alloy AMg6 are calculated for various values of complex amplitude of current in winding. Additionally, the parameters are calculated both without the magnetic core and without the non-magnetic metal. The quantitative comparison of the parameters of the three-dimensional model with the two-dimensional one is performed. The active resistance and inductance of end parts of the inductor are investigated by well-known analytical expressions from handbooks of electric machines. References 11, figures 3, tables 6.
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Dissertations / Theses on the topic "Non-dimensional parameters"

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Antini, Alessandro. "Non-local order parameters in one-dimensional spin systems." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18043/.

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Per molti anni si è creduto che la teoria di Landau sulla rottura spontanea di simmetria esaurisse la descrizione di tutte le fasi in cui è possibile osservare la materia. Ogni transizione di fase si riteneva dunque dover essere sempre accompagnata da un cambiamento della simmetria del sistema. È da diversi decenni ormai che però siamo consapevoli dell'esistenza di fasi della materia distinte che posseggono esattamente la stessa simmetria. A queste fasi è stato dato il nome di fasi topologiche, e chiaramente non possono essere descritte e previste dalla teoria di Landau. In sistemi unidimensionali è possibile osservare fasi topologicamente non banali in presenza di alcune simmetrie. L'esempio più importante in questo contesto è fornito dalla fase in cui si trova la catena di Heisenberg di spin 1 antiferromagnetica, la cosiddetta fase di Haldane. Essa risulta una dei primi esempi di fase topologica, e presenta già diverse caratteristiche proprie di queste fasi, come la presenza di stati di bordo e di ordini di stringa nascosti. Infatti una delle peculiarità delle fasi topologiche è quella di essere rilevate da parametri d'ordine non locali, che a differenza dai comuni parametri d'ordine che caratterizzano le diverse fasi associate a rotture spontanee di simmetria, sono forniti da valori di aspettazione di operatori non locali. In questa tesi vengono introdotti nuovi parametri d'ordine non locali, diversi rispetto a quelli comunemente utilizzati, ma ugualmente efficaci nella rilevazione delle diverse fasi massive in cui è possibile trovare il nostro modello di spin 1 di riferimento, ovvero il cosiddetto modello bilineare-biquadratico. Questi parametri d'ordine non locali sono stati valutati sia numericamente che analiticamente laddove fosse disponibile una rappresentazione esatta dello stato fondamentale del sistema.
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Stringham, Bryan Jay. "Non-Dimensional Modeling of the Effects of Weld Parameters on Peak Temperature and Cooling Rate in Friction Stir Welding." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6710.

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Methods for predicting weld properties based on welding parameters are needed in friction stir welding (FSW). FSW is a joining process in which the resulting properties depend on the thermal cycle of the weld. Buckingham's Pi theorem and heat transfer analysis was used to identify dimensionless parameters relevant to the FSW process. Experimental data from Al 7075 and HSLA-65 on five different backing plate materials and a wide range of travel speeds and weld powers was used to create a dimensionless, empirical model relating critical weld parameters to the peak temperature rise and cooling rate of the weld. The models created have R-squared values greater than 0.99 for both dimensionless peak temperature rise and cooling rate correlations. The model can be used to identify weld parameters needed to produce a desired peak temperature rise or cooling rate. The model can also be used to explore the relative effects of welding parameters on the weld thermal response.
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Mackay, Allen B. "Large-Displacement Linear-Motion Compliant Mechanisms." BYU ScholarsArchive, 2007. https://scholarsarchive.byu.edu/etd/901.

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Linear-motion compliant mechanisms have generally been developed for small displacement applications. The objective of the thesis is to provide a basis for improved large-displacement linear-motion compliant mechanisms (LLCMs). One of the challenges in developing large-displacement compliant mechanisms is the apparent performance tradeoff between displacement and off-axis stiffness. In order to facilitate the evaluation, comparison, and optimization of the performance of LLCMs, this work formulates and presents a set of metrics that evaluates displacement and off-axis stiffness. The metrics are non-dimensionalized and consist of the relevant characteristics that describe mechanism displacement, off-axis stiffness, actuation force, and size. Displacement is normalized by the footprint of the device. Transverse stiffness is normalized by a new performance characteristic called virtual axial stiffness. Torsional stiffness is normalized by a performance characteristic called the characteristic torque. Because large-displacement compliant mechanisms are often characterized by non-constant axial and off-axis stiffnesses, these normalized stiffness metrics are formulated to account for the variation of both axial and off-axis stiffness over the range of displacement. In pursuit of mechanisms with higher performance, this work also investigates the development of a new compliant mechanism element. It presents a pseudo-rigid-body model (PRBM) for rolling-contact compliant beams (RCC beams), a compliant element used in the RCC suspension. The loading conditions and boundary conditions for RCC beams can be simplified to an equivalent cantilever beam that has the same force-deflection characteristics as the RCC beam. Building on the PRBM for cantilever beams, this paper defines a model for the force-deflection relationship for RCC beams. Included in the definition of the RCC PRBM are the pseudo-rigid-body model parameters that determine the shape of the beam, the length of the corresponding pseudo-rigid-body links and the stiffness of the equivalent torsional spring. The behavior of the RCC beam is parameterized in terms of a single parameter defined as clearance, or the distance between the contact surfaces. The RCC beams exhibit a unique force-displacement curve where the force is inversely proportional to the clearance squared. The RCC suspension is modeled using the newly defined PRBM. The suspension exhibits unique performance, generating no resistance to axial motion while providing significant off-axis stiffness. The mechanism has a large range of travel and operates with frictionless motion due to the rolling-contact beams. In addition to functioning as a stand-alone linear-motion mechanism, the RCC suspension can be configured with other linear mechanisms in superposition to improve the off-axis stiffness of other mechanisms without affecting their axial resistance.
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Xie, Jianyong. "Electrical-thermal modeling and simulation for three-dimensional integrated systems." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50307.

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The continuous miniaturization of electronic systems using the three-dimensional (3D) integration technique has brought in new challenges for the computer-aided design and modeling of 3D integrated circuits (ICs) and systems. The major challenges for the modeling and analysis of 3D integrated systems mainly stem from four aspects: (a) the interaction between the electrical and thermal domains in an integrated system, (b) the increasing modeling complexity arising from 3D systems requires the development of multiscale techniques for the modeling and analysis of DC voltage drop, thermal gradients, and electromagnetic behaviors, (c) efficient modeling of microfluidic cooling, and (d) the demand of performing fast thermal simulation with varying design parameters. Addressing these challenges for the electrical/thermal modeling and analysis of 3D systems necessitates the development of novel numerical modeling methods. This dissertation mainly focuses on developing efficient electrical and thermal numerical modeling and co-simulation methods for 3D integrated systems. The developed numerical methods can be classified into three categories. The first category aims to investigate the interaction between electrical and thermal characteristics for power delivery networks (PDNs) in steady state and the thermal effect on characteristics of through-silicon via (TSV) arrays at high frequencies. The steady-state electrical-thermal interaction for PDNs is addressed by developing a voltage drop-thermal co-simulation method while the thermal effect on TSV characteristics is studied by proposing a thermal-electrical analysis approach for TSV arrays. The second category of numerical methods focuses on developing multiscale modeling approaches for the voltage drop and thermal analysis. A multiscale modeling method based on the finite-element non-conformal domain decomposition technique has been developed for the voltage drop and thermal analysis of 3D systems. The proposed method allows the modeling of a 3D multiscale system using independent mesh grids in sub-domains. As a result, the system unknowns can be greatly reduced. In addition, to improve the simulation efficiency, the cascadic multigrid solving approach has been adopted for the voltage drop-thermal co-simulation with a large number of unknowns. The focus of the last category is to develop fast thermal simulation methods using compact models and model order reduction (MOR). To overcome the computational cost using the computational fluid dynamics simulation, a finite-volume compact thermal model has been developed for the microchannel-based fluidic cooling. This compact thermal model enables the fast thermal simulation of 3D ICs with a large number of microchannels for early-stage design. In addition, a system-level thermal modeling method using domain decomposition and model order reduction is developed for both the steady-state and transient thermal analysis. The proposed approach can efficiently support thermal modeling with varying design parameters without using parameterized MOR techniques.
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Sommer, Oliver. "Ein Beitrag zur Untersuchung des Verhaltens dünner Flüssigkeitsfilme nahe gekrümmten Substratoberflächen." Doctoral thesis, Universitätsbibliothek Chemnitz, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-154946.

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In der vorliegenden Arbeit wurde das Verhalten dünner Flüssigkeitsfilme an gekrümmten Substratoberflächen durch experimentelle Beschichtungsversuche basierend auf der non-invasiven laserinduzierten Fluoreszenzmesstechnik und durch numerische Filmsimulationen mit Hilfe des Volume-of-Fluid Mehrphasenmodells untersucht. Besonderes Interesse galt dabei dem Finden optimaler Einflussgrößenkombinationen zur Reduzierung des Fettkanten-Effekts. In der hierfür durchgeführten Parameterstudie wurden sowohl Applikationsparameter wie der Kantenrundungsradius und die Applikationsschichtdicke als auch Stoffparameter der untersuchten Flüssigkeit wie die Viskosität und die Oberflächenspannung variiert. Neben qualitativen Beschreibungen der entstandenen Fettkantengestalten sind als Resultate auch Größen zur Quantifizierung der Fettkanten festgelegt worden und systematisch dargestellt. Es konnte nachgewiesen werden, dass ungünstige und geeignete Parameterkonfigurationen existieren, welche prägnante bzw. kaum auffällige Fettkanten erzeugen, insbesondere im Experiment. Über die dabei eingreifenden Mechanismen der zugrundeliegenden Strömungen wurden konkrete Hypothesen aufgestellt, auch um die resultierenden Proportionalitäten der Fettkantengrößen bezüglich der Einflussgrößen zu plausibilisieren. Weiterhin konnte eine Aussage über die Signifikanz der untersuchten Einflussgrößen getroffen werden. Abschließend wurde eine geeignete dimensionslose Kenngröße generiert, um den Fettkanten-Effekt parameterübergreifend beschreiben zu können, wodurch mittels der Ähnlichkeitstheorie auch eine gewisse Abschätzung des Fettkanten-Effekts ermöglicht wird
In this study the behaviour of a thin liquid layer at a curved solid edge was examined by experimental coating investigations based on the laser-induced fluorescence technique and by numerical film simulations based on the Volume-of-Fluid multiphase flow model, respectively. The main motivation was to find optimal combinations of influencing quantities to reduce the fat-edge effect. Therefore a study of these quantities was performed, in which application parameters like edge radii of curvature and application layer thicknesses as well as determining liquid properties like viscosity and surface tension have been varied. Results are described qualitatively at corresponding fat-edge shapes and quantified by suitable fat-edge parameters, which had to be identified and selected. It could be shown that adverse and appropriate influencing parameter combinations exist, which generate conspicuous and less distinctive fat-edges, respectively - especially in laboratory experiments. The experimental findings and proportionalities regarding fat-edge shapes and dimensions are found to be physically plausible. Furthermore an order of significance of the influencing quantities established. Eventually, a dimensionless quantity was derived by dimensional analysis, which describes the fat-edge effect. Thus, the fat-edge effect has also been described by the application of similarity theory and the corresponding dimenionless number, respectively
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Voodi, Venkata Anil. "Analytical study of non-dimensional parameters governing supercritical flow instabilities." 2004. http://hdl.handle.net/1993/17940.

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Chang, Chi-Hung, and 張啟鴻. "PID Fine Tuning Method Based on Non-dimensional Parameters For the First Order System with Time Delay." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/62173495720368261990.

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碩士
國立屏東科技大學
機械工程系
92
The main idea of this article is with Non-dimensional Paramters, to develop a series of PI Fine Turing Procedure based on Experiment Design. First, it regulates systematic and efficient Experiment Design step by step, practices controlling parameters that might be researched due to human and environmental mistakes while doing fine tuning and then tests if it works out within false system models by partly fine turning methods. In this article, it focuses on First order system with time delay and according to PI Controller, it designs four fine turning methods in terms of IAE, ISE, ITSE and ITAE. Moreover, for PID Controller, it designs five fine turning methods in terms of IAE, ISE and ITAE.The simulating results from computers show it has a certain way to carry Concentric Grid Method to get best matching with Non-dimensional Parameters. Most fine tuning methods can adjust PI/PID Controllers and improve weakness of Z-N Method Parameters. Different Non-dimensional Parameters perform differently in all fine turning methods and list advantages, disadvantages and proper occasions for each method. As a result, through experiment results, we look forward to inspiring next explorers to create much faster and more efficient Fine Tuning Methods in the future.
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Books on the topic "Non-dimensional parameters"

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Kallmeyer, Andrea, José Luis Zamorano, G. Locorotondo, Madalina Garbi, José Juan Gómez de Diego, and Miguel Ángel García Fernández. Non-invasive haemodynamic assessment. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780199599639.003.0005.

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The diagnostic power of two-dimensional (2D) echocardiography resides not only in its capability of providing anatomical information and of studying myocardial contractile function, but also in the possibility of performing a non-invasive haemodynamic assessment. Such non-invasive haemodynamic assessment is the subject of this chapter.2D echocardiography, colour flow imaging, and Doppler modality make this haemodynamic assessment possible, by studying the following parameters: ◆ Blood flow velocities. ◆ Transvalvular pressure gradients. ◆ Valvular areas. ◆ Stroke volume, regurgitant volume, and regurgitant fraction. ◆ Cardiac function.The application of these concepts in clinical practice will be explained through this chapter. They can be summarized in the following points: ◆ The study of valvular insufficiencies. ◆ The study of the valvular stenosis. ◆ The study of intracardiac shunts. ◆ The study of myocardial systolic and diastolic function. ◆ The estimation of intracardiac pressures.Finally, non-invasive haemodynamic study represents an alternative to invasive procedures in some clinical circumstances and it is very important in the diagnostic and therapeutic decision making. Therefore, it is necessary for the cardiologist to understand how this echocardiographic study is performed, as well as its advantages and limitations.
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Haugaa, Kristina H., Francesco Faletra, and João L. Cavalcante. Cardiac rhythm disorders. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780198726012.003.0063.

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Cardiac rhythm disorders require diagnostic, prognostic, and guidance of therapeutic procedures by echocardiography. The most common sustained cardiac arrhythmia is atrial fibrillation (AF) leading to an increased risk for mortality, heart failure, and thromboembolic events. Echocardiography is performed to assess the aetiology of AF which most commonly is associated with diseases leading to enlarged atria. Furthermore, echocardiography is crucial to evaluate thromboembolic risk by assessing the morphology and function of the left atrial appendage among other parameters. Non-invasive imaging modalities including two-dimensional transthoracic (TTE) and transoesophageal echocardiography (TOE) with three-dimensional imaging are often indicated. Finally, TOE can help in the preprocedural planning and providing guidance for interventions such as pulmonary vein ablation and percutaneous left atrial appendage closure. In patients with ventricular arrhythmias, TTE is the first-line diagnostic tool for assessing the aetiology of ventricular arrhythmias. Ischaemic heart disease, either acute or chronic fibrosis, is the most common causes of ventricular tachycardias. Left ventricular ejection fraction remains the most important parameter for indication of an implantable cardioverter defibrillator for primary prevention therapy, although newer strain echocardiographic measures may add incremental prognostic information.
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Escudier, Marcel. Flow through axial-flow-turbomachinery blading. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198719878.003.0014.

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This chapter is concerned primarily with the flow of a compressible fluid through stationary and moving blading, for the most part using the analysis introduced in Chapter 11. The principles of dimensional analysis are applied to determine the appropriate non-dimensional parameters to characterise the performance of a turbomachine. The analysis of incompressible flow through a linear cascade of aerofoil-like blades is followed by the analysis of compressible flow. Velocity triangles for flow relative to blades, and Euler’s turbomachinery equation, are introduced to analyse flow through a rotor. The concepts introduced are applied to the analysis of an axial-turbomachine stage comprising a stator and a rotor, which applies to either a compressor or a turbine.
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Karatasakis, G., and G. D. Athanassopoulos. Cardiomyopathies. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780199599639.003.0019.

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Echocardiography is a key diagnostic method in the management of patients with cardiomyopathies.The main echocardiographic findings of hypertrophic cardiomyopathy are asymmetric hypertrophy of the septum, increased echogenicity of the myocardium, systolic anterior motion, turbulent left ventricular (LV) outflow tract blood flow, intracavitary gradient of dynamic nature, mid-systolic closure of the aortic valve and mitral regurgitation. The degree of hypertrophy and the magnitude of the obstruction have prognostic meaning. Echocardiography plays a fundamental role not only in diagnostic process, but also in management of patients, prognostic stratification, and evaluation of therapeutic intervention effects.In idiopathic dilated cardiomyopathy, echocardiography reveals dilation and impaired contraction of the LV or both ventricles. The biplane Simpson’s method incorporates much of the shape of the LV in calculation of volume; currently, three-dimensional echocardiography accurately evaluates LV volumes. Deformation parameters might be used for detection of early ventricular involvement. Stress echocardiography using dobutamine or dipyridamole may contribute to risk stratification, evaluating contractile reserve and left anterior descending flow reserve. LV dyssynchrony assessment is challenging and in patients with biventricular pacing already applied, optimization of atrio-interventricular delays should be done. Specific characteristics of right ventricular dysplasia and isolated LV non-compaction can be recognized, resulting in an increasing frequency of their prevalence. Rare forms of cardiomyopathy related with neuromuscular disorders can be studied at an earlier stage of ventricular involvement.Restrictive and infiltrative cardiomyopathies are characterized by an increase in ventricular stiffness with ensuing diastolic dysfunction and heart failure. A variety of entities may produce this pathological disturbance with amyloidosis being the most prevalent. Storage diseases (Fabry, Gaucher, Hurler) are currently treatable and early detection of ventricular involvement is of paramount importance for successful treatment. Traditional differentiation between constrictive pericarditis (surgically manageable) and the rare cases of restrictive cardiomyopathy should be properly performed.
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Book chapters on the topic "Non-dimensional parameters"

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Conti, Camilla C., Andrea Spinelli, and Alberto Guardone. "Similarity Parameters for Non-ideal One-Dimensional Isentropic Expansions." In Proceedings of the 3rd International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power, 26–35. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69306-0_4.

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Gupta, Kalpana, Raj Kumar Singh, and M. V. Tendolkar. "Modified Twisted Tape Inserts: Significance of Geometric Non-dimensional Parameters." In Proceedings of International Conference in Mechanical and Energy Technology, 13–26. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2647-3_2.

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Hiraoka, Toshihiro, Shota Takada, and Hiroshi Kawakami. "Proposal of Non-dimensional Parameter Indices to Evaluate Safe Driving Behavior." In Human Interface and the Management of Information. Information and Interaction for Health, Safety, Mobility and Complex Environments, 470–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-39215-3_54.

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Sethna, James P. "Phase-space dynamics and ergodicity." In Statistical Mechanics: Entropy, Order Parameters, and Complexity, 79–98. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198865247.003.0004.

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This chapter provides the mathematical justification for the theory of equilibrium statistical mechanics. A Hamiltonian system which is ergodic is shown to have time-average behavior equal to the average behavior in the energy shell. Liouville’s theorem is used to justify the use of phase-space volume in taking this average. Exercises explore the breakdown of ergodicity in planetary motion and in dissipative systems, the application of Liouville’s theorem by Crooks and Jarzynski to non-equilibrium statistical mechanics, and generalizations of statistical mechanics to chaotic systems and to two-dimensional turbulence and Jupiter’s great red spot.
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Bhanja, S., and B. Sengupta. "DEVELOPMENT OF GENERALISED STRENGTH MODELS INVOLVING NON-DIMENSIONAL PARAMETERS FOR SILICA FUME CONCRETE." In Challenges of Concrete Construction: Volume 6, Concrete for Extreme Conditions, 537–42. Thomas Telford Publishing, 2002. http://dx.doi.org/10.1680/cfec.31784.0052.

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Kim, Eungcheol, Manoj K. Jha, and Min-Wook Kang. "A Sensitivity Analysis of Critical Genetic Algorithm Parameters." In Transportation Systems and Engineering, 1064–81. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8473-7.ch054.

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Genetic Algorithms (GAs) have been applied in many complex combinatorial optimization problems and have been proven to yield reasonably good solutions due to their ability of searching in continuous spaces and avoiding local optima. However, one issue in GA application that needs to be carefully explored is to examine sensitivity of critical parameters that may affect the quality of solutions. The key critical GA parameters affecting solution quality include the number of genetic operators, the number of encoded decision variables, the parameter for selective pressure, and the parameter for non-uniform mutation. The effect of these parameters on solution quality is particularly significant for complex problems of combinatorial nature. In this paper the authors test the sensitivity of critical GA parameters in optimizing 3-dimensional highway alignments which has been proven to be a complex combinatorial optimization problem for which an exact solution is not possible warranting the application of heuristics procedures, such as GAs. If GAs are applied properly, similar optimal solutions should be expected at each replication. The authors perform several example studies in order to arrive at a general set of conclusions regarding the sensitivity of critical GA parameters on solution quality. The first study shows that the optimal solutions obtained for a range of scenarios consisting of different combinations of the critical parameters are quite close. The second study shows that different optimal solutions are obtained when the number of encoded decision variables is changed.
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Kim, Eungcheol, Manoj K. Jha, and Min-Wook Kang. "A Sensitivity Analysis of Critical Genetic Algorithm Parameters." In Civil and Environmental Engineering, 863–80. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-9619-8.ch036.

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Genetic Algorithms (GAs) have been applied in many complex combinatorial optimization problems and have been proven to yield reasonably good solutions due to their ability of searching in continuous spaces and avoiding local optima. However, one issue in GA application that needs to be carefully explored is to examine sensitivity of critical parameters that may affect the quality of solutions. The key critical GA parameters affecting solution quality include the number of genetic operators, the number of encoded decision variables, the parameter for selective pressure, and the parameter for non-uniform mutation. The effect of these parameters on solution quality is particularly significant for complex problems of combinatorial nature. In this paper the authors test the sensitivity of critical GA parameters in optimizing 3-dimensional highway alignments which has been proven to be a complex combinatorial optimization problem for which an exact solution is not possible warranting the application of heuristics procedures, such as GAs. If GAs are applied properly, similar optimal solutions should be expected at each replication. The authors perform several example studies in order to arrive at a general set of conclusions regarding the sensitivity of critical GA parameters on solution quality. The first study shows that the optimal solutions obtained for a range of scenarios consisting of different combinations of the critical parameters are quite close. The second study shows that different optimal solutions are obtained when the number of encoded decision variables is changed.
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Nihoyannopoulos, Petros, and Julia Grapsa. "Pulmonary hypertension and the right ventricle." In ESC CardioMed, edited by Frank Flachskampf, 485–90. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0099.

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Due to its widespread availability, echocardiography is used as the first-line imaging modality for the assessment of right ventricular size, function, and pressures. Two-dimensional echocardiography can easily obtain valuable quantitative information about right ventricular size and function. Measurements such as the tricuspid annular plane systolic excursion, right ventricular myocardial performance index, fractional area change, tissue Doppler-derived tricuspid lateral annular systolic velocity, global longitudinal strain and strain rate, and eccentricity index are the recommended parameters to be used for the routine evaluation of right ventricular function. Three-dimensional echocardiography and three-dimensional strain have now entered the clinical arena for a more precise right ventricular assessment. Echocardiography is also important to establish the causes of secondary pulmonary hypertension (group 2) by evaluating the various left heart conditions leading to the rise of right ventricular systolic pressures. Finally, echocardiography is probably the most accurate non-invasive imaging modality for the assessment of right ventricular pressure and is therefore an ideal tool for the evaluation and screening of pulmonary hypertension.
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Patmonoaji, Anindityo, Yingxue Hu, Chunwei Zhang, and Tetsuya Suekane. "Dissolution Mass Transfer of Trapped Phase in Porous Media." In Porous Fluids - Advances in Fluid Flow and Transport Phenomena in Porous Media. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95448.

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Dissolution mass transfer of trapped phase (TP) to flowing phase (FP) in porous media plays significant roles in hydrogeology, e.g., groundwater contamination by non-aqueous phase liquids, groundwater in-situ bioremediation, and geological carbon sequestration. In this chapter, this phenomenon is described. First, the physical and mathematical models are given. Afterwards, various conditions affecting this process, i.e., porous media characteristics, capillary trapping characteristics, flow bypassing, TP characteristics, and FP velocity, are discussed. These various conditions are described based on three parameters affecting the dissolution mass transfer: TP interfacial area (A), TP dissolution ratio (ξ), and mass transfer coefficient (k). Eventually, models to predict the mass transfer are formulated based on non-dimensional model. All of the data in this chapter are based on the experiments obtained by using micro-tomography and a series of image processing techniques from our latest works.
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Lohar, Hareram, Anirban Mitra, and Sarmila Sahoo. "Effect of Boundary Conditions and Taper Patterns on Geometrically Nonlinear Frequency Response of Axially Graded Beams on Elastic Foundation." In Handbook of Research on Advancements in Manufacturing, Materials, and Mechanical Engineering, 110–40. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4939-1.ch006.

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Forced vibration analysis is performed on a tapered axially functionally graded beam resting on elastic foundation under externally applied harmonic excitations to present the effect of boundary conditions and taper patterns on the frequency response. The elastic foundation is modelled in the present analysis as Winkler foundation. A displacement based semi-analytical method is adopted for mathematical formulation and the derivation of governing equations is carried out following Hamilton's principle. Von Karman nonlinear strain-displacement relation employed to incorporate geometric nonlinearity. Broyden method is adopted to solve the nonlinear set of equations. Frequency response curves are plotted in non-dimensional frequency-amplitude plane to represent nonlinear forced vibration characteristic of the system. New benchmark results are also provided for different combination of system parameters (i.e., excitation amplitudes, foundation stiffness values, material models, taper patterns, and flexural boundary conditions). Operational deflection shapes (ODS) are also presented.
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Conference papers on the topic "Non-dimensional parameters"

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Waldren, J. J., C. J. Clark, S. D. Grimshaw, and G. Pullan. "Non-Dimensional Parameters for Comparing Conventional and Counter-Rotating Turbomachines." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91632.

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Abstract Counter-rotating turbomachines have the potential to be high efficiency, high power density devices. Comparisons between conventional and counter-rotating turbomachines in the literature make multiple and often contradicting conclusions about their relative performance. By adopting appropriate non-dimensional parameters, based on relative blade speed, the design space of conventional machines can be extended to include those with counter-rotation. This allows engineers familiar with conventional turbomachinery to transfer their experience to counter-rotating machines. By matching appropriate non-dimensional parameters the loss mechanisms directly affected by counter-rotation can be determined. A series of computational studies are performed to investigate the relative performance of conventional and counter-rotating turbines with the same non-dimensional design parameters. Each study targets a specific loss source, highlighting which phenomena are directly due to counter-rotation and which are solely due to blade design. The studies range from two-dimensional blade sections to three-dimensional finite radius stages. It is shown that, at hub-to-tip ratios approaching unity, with matched non-dimensional design parameters, the stage efficiency and work output are identical for both types of machine. However, a counter-rotating turbine in the study is shown to have an efficiency advantage over a conventional machine of up to 0.35 percentage points for a hub-to-tip ratio of 0.65. This is due to differences in absolute velocity producing different spanwise blade designs.
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Sharifi, Navid, Masoud Boroomand, and Majid Sharifi. "Numerical Optimization of Ejector Geometry Based on Non-Dimensional Parameters." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86837.

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Supersonic steam ejectors are simple devices which can be used to compress a low pressure flow by a pressurized motive flow. “Compression ratio” and “entrainment ratio” are two major characteristics of the ejectors. One of the current challenging issues in ejector design is the correct size selection for different dimensions of ejectors to achieve the maximum entraining capability at a given compression ratio. The conventional design methods are based on varying shape parameters such as lengths, angles and diameters and pick a particular geometry which yields the best performance under a given boundary conditions. In the current study, a new method of size selection for different geometrical parameters of ejectors will be introduced. The basis of this method is to define a non-dimensional volume in terms of ejector dimensions. The effect of varying this parameter on the characteristics of ejectors has been studied numerically via a CFD method. The numerical simulation has been performed on more than 400 ejector models with different geometries according to the finite-volume steady-state method. Steam was taken as the working fluid and it was assumed a real gas with a nonlinear relationship between pressure and density. The numerical results verified with experimental measurements obtained from a pilot model of steam ejector. This method enables us to develop the practical characteristic curves based on non-dimensional parameters which further leading to achieve an optimized size selection for design purposes.
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Cheng, Yuan. "Non-dimensional Peak Breach Outflow Analysis with Dam Breach Parameters." In Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40517(2000)91.

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Aono, Toshio, and Chiaki Goto. "On The Characteristics of One-Dimensional Spectra and Non-Dimensional Parameters of Wind Waves." In 24th International Conference on Coastal Engineering. New York, NY: American Society of Civil Engineers, 1995. http://dx.doi.org/10.1061/9780784400890.002.

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Sharifi, Navid, and Masoud Boroomand. "Numerical Optimization of Thermo-Compressors Based on Non-Dimensional Geometrical Parameters." In ASME 2012 Gas Turbine India Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gtindia2012-9701.

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Thermo-compressors are essential parts in desalination units and using the high pressure motive steam to compress large amounts of low pressure steam without any moving parts or blades. One of the current challenging issues in thermo-compressor design is the correct size selection for different dimensions to achieve the maximum entraining capability at a given compression ratio. The conventional design methods are based on varying shape parameters such as lengths, angles and diameters of internal parts and select a particular geometry which yields the best performance under given boundary conditions. The major characteristics of thermo-compressors which have to be compromised during such design procedures are “compression ratio” and “entrainment ratio”. In the current study, a new method of size selection for different geometrical parameters of thermo-compressors will be introduced. The basis of this method is to define two new non-dimensional parameters in terms of geometrical parameters. The effect of varying these parameters on both characteristics of thermo-compressors has been studied numerically via a CFD method and subsequently, a practical correlation has been developed to express the relationship between the characteristics and the geometrical parameters. The expression obtained from numerous simulations can be applied to evaluate the performance of a given geometry prior to manufacturing. The numerical simulation has been performed on more than 320 different models with different geometries according to the finite-volume steady-state method. The structured meshes were generated within the computational domain. In addition, several mesh concentrations have been studied to develop a mesh-independent model. Moreover, a modified k-epsilon method has been adopted to model the turbulent flow. Steam was taken as the working fluid and it was assumed a real gas with a nonlinear relationship between pressure and density. All governing equations have been discretized with a second-order upwind scheme and solved by implicit method. The numerical results verified with experimental measurements obtained from a real life model of thermo-compressor. The outcomes of applying the validated method on several models enable us to develop the practical characteristic curves based on non-dimensional parameters which further leading to achieve optimized shape selection for thermo-compressors.
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Huang, Shan, and Wusheng Wu. "Non-Dimensional Parameters Governing the Onset of Wake-Induced Marine Riser Collision." In ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2003. http://dx.doi.org/10.1115/omae2003-37121.

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Wake-induced riser oscillation can lead to riser clashing. Furthermore, the onset of the wake-induced riser oscillation, which is typified by its large amplitude and low frequency, is attributed to the loss of stability of the downstream riser in the wake once the current exceeds a critical value. The loss of stability is mathematically characterised by a stationary bifurcation. Based upon our previous work, further results are presented in the paper on the non-dimensional parameters which govern the critical current speed. These non-dimensional parameters, once computed, can then be used by riser designers to assess potential riser clashing and/or ascertain the minimum riser spacing and top tension required in order to avoid riser clashing.
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Taeibi-Rahni, Mohammad, and Shervin Sharafatmand. "Effects of Non-Dimensional Parameters on Formation and Break Up of Cylindrical Droplets." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56879.

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The consistent behavior of non-dimensional parameters on the formation and break up of large cylindrical droplets has been studied by direct numerical simulations (DNS). A one-fluid model with a finite difference method and an advanced front tracking scheme was employed to solve unsteady, incompressible, viscous, immiscible, multi-fluid, two-dimensional Navier-Stokes equations. This time dependent study allows investigation of evolution of the droplets in different cases. For moderate values of Atwood number (AT), increasing Eotvos number (Eo) explicitly increases the deformation rate in both phenomena. Otherwise, raising the Ohnesorge number (Oh) basically amplifies the viscous effects.
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Merkisz, Jerzy, Marek Waligórski, and Wojciech Gis. "On-Board Diagnostic of Combustion Process in CI Engines with the Use of Dimensional and Non-Dimensional Vibration Signal Parameters." In Asia Pacific Automotive Engineering Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2007. http://dx.doi.org/10.4271/2007-01-3545.

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Mozumdar, Subir, and Obaidul Islam. "New Non-Dimensional Parameters in Fluid Mechanics and Their Application to Turbine Flowmeter Data Analysis." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-486.

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Dimensional analysis has been used in experimental fluid mechanics for over a hundred years. Controllable and uncontrollable variables in an experiment can be efficiently organized into nondimensional groups or parameters. Such nondimensional parameters are used for geometric scaling, and for developing dynamic similitude in experimental processes. Commonly used nondimensional parameters in fluid mechanics include Reynold’s No., Mach No., Froude No., Weber No., Strouhal No., etc. Most modern text books and technical papers discuss the use of Buckingham Pi Theorem for developing the nondimensionalization process. An often ignored and somewhat older technique is the Rayleigh Method. Both the Pi Theorem and the Rayleigh Method are founded on the Principle of Dimensional Homogeneity, and require some experience in the grouping of physical variables. The present paper uses the Rayleigh method to develop two new nondimensional parameters. A discussion is presented about the use of the parameters in the application of turbine flowmeter calibration and test data analysis. It is shown that data analysis for turbine flowmeters is considerably simplified by the use of the new parameters.
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Purkayastha, Rajlakshmi T., and Robert M. McMeeking. "The Use of Non-Dimensional Parameters to Study Stress in Lithium-Ion Battery Electrode Storage Particles." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85267.

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Mechanical degradation is thought to be one of the causes of capacity fade within Lithium-Ion batteries. In this work we develop a coupled stress-diffusion model for idealized spherical storage particles, which is analogous to the development of thermal strains. We then non-dimensionalize the model and identify three important parameters that control the development of stress within these particles. We can therefore use a wide number of values for these parameters to make predictions about the stress responses of different materials. The maximum stress developed within the particle for different values of these parameters are plotted as stress maps. A two dimensional model of a battery was then developed, in order to study the effect of particle morphology.
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Reports on the topic "Non-dimensional parameters"

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Patel, Reena, David Thompson, Guillermo Riveros, Wayne Hodo, John Peters, and Felipe Acosta. Dimensional analysis of structural response in complex biological structures. Engineer Research and Development Center (U.S.), July 2021. http://dx.doi.org/10.21079/11681/41082.

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The solution to many engineering problems is obtained through the combination of analytical, computational and experimental methods. In many cases, cost or size constraints limit testing of full-scale articles. Similitude allows observations made in the laboratory to be used to extrapolate the behavior to full-scale system by establishing relationships between the results obtained in a scaled experiment and those anticipated for the full-scale prototype. This paper describes the application of the Buckingham Pi theorem to develop a set of non-dimensional parameters that are appropriate for describing the problem of a distributed load applied to the rostrum of the paddlefish. This problem is of interest because previous research has demonstrated that the rostrum is a very efficient structural system. The ultimate goal is to estimate the response of a complex, bio-inspired structure based on the rostrum to blast load. The derived similitude laws are verified through a series of numerical experiments having a maximum error of 3.39%.
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Ravazdezh, Faezeh, Julio A. Ramirez, and Ghadir Haikal. Improved Live Load Distribution Factors for Use in Load Rating of Older Slab and T-Beam Reinforced Concrete Bridges. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317303.

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This report describes a methodology for demand estimate through the improvement of load distribution factors in reinforced concrete flat-slab and T-beam bridges. The proposed distribution factors are supported on three-dimensional (3D) Finite Element (FE) analysis tools. The Conventional Load Rating (CLR) method currently in use by INDOT relies on a two-dimensional (2D) analysis based on beam theory. This approach may overestimate bridge demand as the result of neglecting the presence of parapets and sidewalks present in these bridges. The 3D behavior of a bridge and its response could be better modeled through a 3D computational model by including the participation of all elements. This research aims to investigate the potential effect of railings, parapets, sidewalks, and end-diaphragms on demand evaluation for purposes of rating reinforced concrete flat-slab and T-beam bridges using 3D finite element analysis. The project goal is to improve the current lateral load distribution factor by addressing the limitations resulting from the 2D analysis and ignoring the contribution of non-structural components. Through a parametric study of the slab and T-beam bridges in Indiana, the impact of selected parameters on demand estimates was estimated, and modifications to the current load distribution factors in AASHTO were proposed.
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