scholarly journals INVESTIGATION OF TRANSFER RATIO FOR DAMPFER WITH DOUBLE LAYER POROUS RING

2016 ◽  
Vol 2016 (3) ◽  
pp. 67-75
Author(s):  
Александр Мукутадзе ◽  
Aleksandr Mukutadze
Keyword(s):  
Comparative Analysis ◽  
Reynolds Equation ◽  
Porous Layers ◽  
Lubricant Flow ◽  
Transmitted Force ◽  
Lubrication Layer ◽  
Analysis Of Results ◽  
Darcy Equations ◽  
Combined Feed ◽  
Real Practice

In the paper on the basis of Darcy equations defining a lubricant flow in porous layers and modified Reynolds equation is solved a problem of unsteady flow of viscous incompressible lubricant in the gap of a doublelayer porous damper. A case is considered when permeability in porous layers changes according to a normal low, and a combined feed of lubricant is carried out simultaneously in axial and radial directions. As a result of the solution of the problem specified there is found a field of pressures in porous layers and a lubrication layer, there are also obtained analytical dependences for efforts in an oil film, a module of unbalance transmitted force and also stationary and transitional transfer ratios are determined. It is proved that the combined lubricant feed a damper functions more stably, than at a separate axial and radial its feed. The obtained specified calculated models allowed determining the efficiency of additional factors account, and also carrying out a comparative analysis of results newly obtained and already available that defined a larger proximity of a new model to real practice.

scholarly journals DAMPER WITH POROUS ANISOTROPIC RING

2016 ◽  
Vol 2016 (3) ◽  
pp. 17-28 ◽  
Author(s):  
Александр Мукутадзе ◽  
Aleksandr Mukutadze ◽  
Камил Ахвердиев ◽  
Kamil Akhverdiev ◽  
Борис Флек ◽  
...  
Keyword(s):  
Porous Layer ◽  
Radial Direction ◽  
Unsteady Motion ◽  
Porous Layers ◽  
Lubricating Layer ◽  
Lubricant Flow ◽  
Analysis Of Results ◽  
Darcy Equations ◽  
Modified Equation ◽  
Orthogonal Anisotropy

In the work on the basis of Darcy equations defining lubricant flow in porous layers, and of Reynolds modified equation the problem of an unsteady motion of viscous incompressible lubricant in the gap of a por-ous damper is under solution. A case is under consideration when a forced lubricant supply is carried out in circumferential and radial directions taking into account the influence of orthogonal anisotropy of a porous layer. As a result of the solution of the problem specified there is found a field of pressures in a porous and lubricating layer, and analytical dependences for efforts in an oil film are obtained. Besides, there is defined a module of an unbalance transmitted effort and also stationary and transient ratios of transfer. It is proved that at the forced lubricant feed in a circumferential or radial direction taking into account the influence of orthogonal anisotropy of a porous layer, a damper functions more steadily. The obtained specified calculated models al-lowed defining a number of supplementary factors and also carrying out a comparative analysis of results newly obtained and already existing ones. It confirmed a larger proximity of a new model an actual practice.

A COMPARATIVE ANALYSIS OF RESULTS AND MORBIDITY IN TYPE I DIABETICS UNDERGOING PREEMPTIVE VERSUS POSTDIALYSIS COMBINED PANCREAS-KIDNEY TRANSPLANTATION

1993 ◽  
Vol 55 (5) ◽  
pp. 1097-1103 ◽  
Author(s):  
ROBERT J. STRATTA ◽  
RODNEY J. TAYLOR ◽  
CLAIRE F. OZAKI ◽  
J. STEVEN BYNON ◽  
SUZANNE A. MILLER ◽  
...  
Keyword(s):  
Kidney Transplantation ◽  
Comparative Analysis ◽  
Type I ◽  
Analysis Of Results ◽  
Pancreas Kidney Transplantation

scholarly journals Comparative analysis of evidence based policies in the era of digitalization

2020 ◽  
Vol 338 ◽  
pp. 477-485
Author(s):  
András Bojtor ◽  
Gábor Bozsó
Keyword(s):  
Comparative Analysis ◽  
Public Administration ◽  
Good Governance ◽  
Development Program ◽  
Policy Cycle ◽  
Evaluation Phase ◽  
Analysis Of Results ◽  
Strategic Policy ◽  
Political Conditions ◽  
International Comparative

A well-functioning administration with embedded institutions enables the formulation of a competitive environment which propitiously effects the country’s economic growth. In case of an intervention, the results and impacts should be measured and continuously monitored in a strategic policy cycle. These activities can be done on project and national levels and at the same time there could be a legitimate claim for carrying out international comparative analysis of results. The majority of public administration developments belongs to the scope of e-government. The evidencebased policy making is a component of good governance next to transparency, sustainability, efficiency, integrity and people centricity. Government obligations and responsibilities in evaluations vary from country to country. Digitalization brings new challenges for public service and governments are taking various measures in response to them. Evaluation can fulfil its role in the strategic policy cycle only if it can meet the political conditions with attention to ethical and methodological standards; can adapt to the digitalized circumstances. The paper aims a deeper analysis of evaluation phase, and to summarize the possible new methods reaching better results in public services and public administration services. In this paper we are going to conduct an international comparative analysis with a special attention given to a public administration development program in Hungary.

Measuring Microcomputer Literacy

1987 ◽  
Vol 16 (1) ◽  
pp. 29-43 ◽  
Author(s):  
D. G. Dologite
Keyword(s):  
College Students ◽  
Comparative Analysis ◽  
Research Study ◽  
Average Student ◽  
Analysis Of Results

This article discusses the results of an on-going research study to measure microcomputer literacy. College students are surveyed about their previously acquired microcomputer literacy before taking a microcomputer course. The objective of the survey is to determine if students have enough preparation for an enriched course. The study, the methodology, and a detailed comparative analysis of results from fifty-four student cases divided between the 1985 and 1986 school years are discussed. A microcomputer literacy index is developed to measure average student literacy, to compare literacy from one class year to another, and to rank students in order of literacy. Implications for broader applications of the method used are discussed.

A Porous Media Model for Thin Film Lubrication

1995 ◽  
Vol 117 (1) ◽  
pp. 16-21 ◽  
Author(s):  
J. A. Tichy
Keyword(s):  
Reynolds Equation ◽  
Squeezing Flow ◽  
Thin Film Lubrication ◽  
Porous Layers ◽  
Porosity Parameter ◽  
Porous Media Model ◽  
Molecular Length ◽  
Load Increase ◽  
Thickness Parameter ◽  
Film Lubrication

A rheological model has been developed which can be applied to boundary lubrication. The model is applicable to thin films in which the molecular length scale is the same order as the film thickness. The micro structure is simulated by porous layers attached to the contact surfaces. The model contains three material properties: (1) viscosity, (2) the thickness of the porous layer, and (3) a porosity parameter. A modified Reynolds equation is developed. Behavior in two types of contacts is calculated: squeezing flow between crossed cylinders (Chan and Horn’s, 1985 drainage experiment) and a one-dimensional converging wedge contact. The effect of the layer thickness parameter is to increase the load and reduce the friction coefficient. Increasing the porosity parameter value tends to reduce the magnitude of the load increase.

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