A Model for Thermal Bending in Overhung Rotors

1999 ◽  
Author(s):  
A. C. Balbahadur ◽  
R. G. Kirk
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Theoretical Model ◽  
Current Model ◽  
Approximate Model ◽  
The Other ◽  
Thermal Bending ◽  
Overhung Rotors

Abstract An approximate model for thermal bending caused by viscous lubricant shearing in overhung rotors has been developed. This model has been tested against a published theoretical model and an experimental study. It was found that the current model agreed well with both the other theoretical model and the experimental data.

Induction Electrohydrodynamic Pump in a Vertical Configuration: Part 2—Experimental Study

1989 ◽  
Vol 111 (3) ◽  
pp. 670-674 ◽  
Author(s):  
J. Seyed-Yagoobi ◽  
J. C. Chato ◽  
J. M. Crowley ◽  
P. T. Krein
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Theoretical Model ◽  
Natural Circulation ◽  
External Pressure ◽  
Temperature Profiles ◽  
Flow Rates ◽  
Present Apparatus ◽  
Circulation Velocity ◽  
Good Agreement

An induction electrohydrodynamic (EHD) pump in axisymmetric, vertical configuration was designed and built. The flow rates were measured for various temperature profiles and several values of frequency, voltage, wavelength, and electric conductivity. The experimental data are generally in good agreement with the theoretical model presented in Part 1. With the present apparatus at relatively low voltages, velocities four times higher than natural circulation velocity are easily obtained. The external pressure load and entrance temperature profile play important roles on the operation of the pump and must be considered carefully in the design.

The New Method to Separate Stannum and Copper in the Process of Refining Tin

2020 ◽  
Vol 996 ◽  
pp. 157-164
Author(s):  
Bo Zhang ◽  
Da Chun Liu ◽  
Heng Xiong ◽  
Zhen Gen Zhou ◽  
Xu Li ◽  
...  
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Reaction Temperature ◽  
Removal Rate ◽  
Human Life ◽  
The Other ◽  
New Method ◽  
Promising Technology ◽  
Temperature Time ◽  
Sulfiding Agent

As the ancient metal, Sn is widely used in all aspects of human life. Nowadays, S, as the vulcanizing agent, is used in the process of refining tin to separate Cu and Sn. However, there are few reports about the other agent of removing copper from stannum. In this study, SnS, a new sulfiding agent to separate Cu and Sn, was investigated. During the process, SnS replaces the combination of Sn and Cu. The variables considered in the experimental study were reaction temperature, time and the ratio of reactants. The experimental data indicated under certain conditions, the removal rate of Cu reach 94.3%. At last, we studied the vacuum reaction of Cu2S and Sn, results indicated that under appropriate conditions, the Cu is detected. The SnS is formed. And after the vacuum reaction, the SnS could be used recycling. This work presented a promising technology for separating Cu from tin.

scholarly journals Part I—Theoretical Model for a Synchronous Thermal Instability Operating in Overhung Rotors

2004 ◽  
Vol 10 (6) ◽  
pp. 469-475 ◽  
Author(s):  
A. C. Balbahadur ◽  
R. G. Kirk
Keyword(s):  
Stability Analysis ◽  
Theoretical Model ◽  
Thermal Instability ◽  
Journal Bearing ◽  
Current Model ◽  
Threshold Criterion ◽  
Tilting Pad ◽  
Overhung Rotors ◽  
Tilting Pad Journal Bearing ◽  
Domain Stability

Atheoretical model has been developed for a synchronous thermal instability that is caused by differential viscous shearing in bearings of overhung rotors. This model employs an unbalance threshold criterion for instability instead of utilizing a traditional frequency-domain stability analysis. The current model will be used to investigate several case studies for both plain and tilting pad journal bearing rotors in the second part of this article.

scholarly journals Computation of Unsteady Blade Forces in Turbomachines by Means of Potential Flow Theory and by Simulating Viscous Wakes

1982 ◽  
Author(s):  
P. Krammer
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Velocity Field ◽  
Flow Field ◽  
Potential Flow ◽  
Flow Theory ◽  
The Other ◽  
Potential Flow Theory ◽  
Flow Fluctuations ◽  
Excitation Mechanisms

This paper describes a new theoretical model which computes two main excitation mechanisms, one based on the potential flow theory and the other explainable by the motion of blades through the wakes of preceding blades. The computation of the potential flow field is based on the assumption of a plane, unsteady, incompressible flow. Fluctuations of circulation caused by an alternating velocity field are taken into account by free vortex paths. Blade surfaces are modeled by a vortex distribution. Viscous wakes are simulated by means of contrarotating vortex rows. Results of the theoretical approach are compared with experimental data measured in axial turbomachines.

scholarly journals Experimental study of the behaviour of mini-charge underwater explosion bubbles near different boundaries

2010 ◽  
Vol 651 ◽  
pp. 55-80 ◽  
Author(s):  
C. F. HUNG ◽  
J. J. HWANGFU
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Underwater Explosion ◽  
The Other ◽  
Predictive Index ◽  
Local Vibration ◽  
Cavitation Bubbles ◽  
Relative Value ◽  
Similarities And Differences ◽  
The Relationship

This work experimentally studies the behaviour of underwater explosion bubbles near different boundaries. The results are compared with theoretical and experimental data on cavitation bubbles. Although explosion and cavitation bubbles behave similarly on a macroscopic level, there are still some differences, most of which are from the explosive nature of the explosion bubble. The relationship between bubble migration and the Kelvin impulse, surface inertia m* and surface stiffness k* is investigated. We found that none of them comprehensively predicts the migration of both cavitation and explosion bubbles when boundary elasticity is considered. This elasticity should be considered as a relative value with respect to bubble size. On the other hand, the phase between local vibration of boundaries and the pulsation of bubbles could be a useful predictive index of bubble migration. When using research results developed for cavitation bubbles in relation to explosion bubbles, the material presented here may be useful for pointing out their similarities and differences.

The Immunoglobulin M Molecule: Isomeric Forms of the Monomer Subunit

1975 ◽  
Vol 53 (8) ◽  
pp. 923-929 ◽  
Author(s):  
M. E. Percy ◽  
J. R. Percy
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Heavy Chain ◽  
Immunoglobulin M ◽  
The Other ◽  
Heavy Chains ◽  
Novel Technique ◽  
Simple Theoretical Model ◽  
Covalently Bonded ◽  
Conventional Structure

We have devised a novel technique which uses a simple theoretical model to simulate the reduction of immunoglobulin M (IgM) molecules. By fitting the results of the simulated depolymerization to experimental data, we have obtained statistical evidence which suggests that two major isomeric forms of covalently-bonded IgM monomer are liberated when human 19S IgM is reduced with dithiothreitol. The two heavy chains of isomer 1 are linked by two dilsulfide bridges, one in the segment designated the "hinge" region (position 337), the other penultimate to the COOH terminus of the chains (position 575). The half-cystines at position 414, which are free in isomer 1, form an inter-heavy chain bridge in isomer 2. Theoretically, the relative proportions of the two forms of monomer liberated in the reduction depend upon the dithiothreitol concentration, with isomer 2 predominating at higher dithiothreitol concentrations. Although in this paper we have assumed the conventional structure of the IgM molecule, the liberation of isomers depends only upon a symmetrical arrangement of the three types of inter-heavy chain bonds in the cyclic 19S pentamer.

scholarly journals Pseudorapidity distributions of charged particles produced in p–p collisions at center-of-mass energies from 23.6 GeV to 900 GeV

2014 ◽  
Vol 29 (27) ◽  
pp. 1450130 ◽  
Author(s):  
Z. J. Jiang ◽  
H. L. Zhang
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Hydrodynamic Model ◽  
Energy Region ◽  
Center Of Mass ◽  
Charged Particles ◽  
The Other ◽  
Fragmentation Region ◽  
Available Energy ◽  
Pseudorapidity Distributions

In p–p collisions there are two leading particles, one in the projectile and the other in the target fragmentation region. In this paper we show that, just like in nucleus–nucleus collisions, the revised Landau hydrodynamic model alone does not provide a good enough description of the measured pseudorapidity distributions of charged particles produced in p–p collisions. Only after the leading particles are taken into account can the experimental data be properly matched with the theoretical model in the entire available energy region from [Formula: see text] to 900 GeV.

Eurasian "Theory of Economy Management" as an Organic Part of the Russian Economic School

2003 ◽  
pp. 95-110
Author(s):  
M. Voeykov
Keyword(s):  
Economic Development ◽  
Theoretical Model ◽  
Initial Step ◽  
State Regulation ◽  
Soviet Economy ◽  
The Other ◽  
Large Share ◽  
Organic Part ◽  
Two Sides ◽  
Enterprise Activity

The original version of "the theory of economy management", developed in the 1920s by Russian economists-emigrants who called themselves "Eurasians" (N. Trubetskoy, P. Savitskiy, etc.) is analyzed in the article. They considered this theory to be the basis of the original Russia's way of economic development. The Eurasian theory of economy management focuses on two sides of enterprise activity: managerial as well as social and moral. The Eurasians accepted the Soviet economy with the large share of state regulation as the initial step of development. On the other hand they paid much attention to the private sector activity. Eurasians developed a theoretical model of the mixed economy which can be attributed as the Russian economic school.

EXPERIMENTAL STUDY OF THE KINEMATIC PARAMETERS OF MOVEMENT OF CARS FORCED IDLE MOTION

2018 ◽  
pp. 52-57
Author(s):  
Ivelin Kostov
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Experimental Research ◽  
Kinematic Parameters ◽  
Research Results ◽  
Software Product

In the work brought some experimental data of kinematic parameters of movement of cars forced idle, as the software product was used to diagnose 900 ATS, which recorded kinematic parameters of vehicle. On the basis of the conducted experimental research results are shown tabulated and analysed.

scholarly journals Health and Risk Behaviors of Bystanders: An Integrative Theoretical Model of Bystanders’ Reactions to Mistreatment

2021 ◽  
Vol 18 (11) ◽  
pp. 5552
Author(s):  
Yariv Itzkovich ◽  
Ella Barhon ◽  
Rachel Lev-Wiesel
Keyword(s):  
Theoretical Model ◽  
Health Risk ◽  
Risk Behaviors ◽  
Moral Disengagement ◽  
Current Model ◽  
Health Risk Behaviors ◽  
Conservation Of Resources ◽  
Cognitive Reactions ◽  
Proposed Model ◽  
New Applications

This article constructs a comprehensive theoretical model that outlines bystanders’ emotional and behavioral responses to the mistreatment of adolescent peers. The model captures bystanders’ risk and health risk behaviors, which have been overlooked in the context of their reactions; when addressed at all in connection with bystanders of bullying among adolescents, they have been treated separately. Here, we present bystanders’ emotional and cognitive reactions and their impact on bystanders’ responses including a set of responses that demonstrate risk and health risk behaviors that are directed to the bystander as a victim by proxy. The theoretical framework is the conservation of resources theory, which posits that personal resources (i.e., potency and moral disengagement) and social resources impact the process that leads to bystanders’ reactions. Previous models have overlooked the integrative viewpoint of bystanders, and comprehensive models that explain bystanders’ behavioral and emotional responses have received little attention especially with regards to adolescents. Two recent models overlooked core features embedded in the current model, including the risk and health risk behaviors that it integrates. The proposed model presents a novel and more comprehensive view of bystanders’ reactions and the process underlying these reactions. It integrates existing knowledge embedded in other existing models. At the same time, this perspective indicates the centricity of potency as a key resource that dictates the emotional response and behaviors of bystanders. This potentially allows for new applications in the mitigation of adverse impacts that follow the witnessing of mistreatment. The article discusses these applications, which are based on previous findings, their implications for practice, and directions for future empirical research necessary to validate the model.

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