Analysis of Failure Mechanism of Forced Convection in the Cornea of the Human Eye

2012 ◽  
pp. 217-226 ◽  
Author(s):  
Humberto Dória Silva ◽  
Luiz Cláudio Pereira Dória ◽  
Cristiana Pereira Dória ◽  
Cristiane Pereira Dória ◽  
Maria do Carmo Tatiana Dória Silva ◽  
...  
Keyword(s):  
Failure Mechanism ◽  
Forced Convection ◽  
Human Eye

Forced Convection Mechanism Failure in the Eye Can Cause Macular Degeneration

2013 ◽  
Vol 334-335 ◽  
pp. 230-234 ◽  
Author(s):  
Humberto Dória Silva ◽  
E. Dória Silva ◽  
Luiz Cláudio Pereira Dória ◽  
Cristiana Pereira Dória ◽  
Cristiane Pereira Dória ◽  
...  
Keyword(s):  
Macular Degeneration ◽  
Forced Convection ◽  
Trabecular Meshwork ◽  
Transport Mechanism ◽  
Genetic Factor ◽  
Genetic Factors ◽  
Statistical Association ◽  
Human Eye ◽  
Clinical Procedures

Although the exact causes for presbyopia are not known with certainty, there is the general understanding that it is associated with aging. This is one of the major paradigms of science because the analysis of the symptoms observed during the treatment of presbyopia in the first author of this paper indicates that presbyopia is associated with metabolic dehydrated secretions that have accumulated in various parts of the eyes. As a process of accumulation it is not difficult to associate it statistically to aging. The metabolic secretions produced by the cells inside the human eye are accumulated simultaneously in the cornea, trabecular meshwork, in the lens and retina, subject only to its origin, however, the symptomatology is well characterized by the location of accumulation. Genetic factors are directly related to how the clumps of metabolic secretions occur and the accumulation form is very specific according to the movement of the eyes based on the activities performed by the patient, so any outcome is unpredictable. This paper introduces the hypothesis that macular degeneration may be caused by transport mechanism failure by forced convection of nutrients and metabolic mass produced by the retina. The hypothesis examined in this paper considers the symptoms observed during treatment of presbyopia the first author, the analysis of some clinical procedures to diagnose the degeneration, the symptoms described in the publications on this subject as well as showing how some genetic factor may anticipate the disease. It is not hard to make a statistical association of macular degeneration with aging in the hypothesis that it is caused by of metabolic accumulation of secretions produced in the retina.

Forced Convection Mechanism Failure in the Eye Can Cause Cataract

2013 ◽  
Vol 334-335 ◽  
pp. 225-229 ◽  
Author(s):  
Humberto Dória Silva ◽  
E. Dória Silva ◽  
Luiz Cláudio Pereira Dória ◽  
Cristiana Pereira Dória ◽  
Cristiane Pereira Dória ◽  
...  
Keyword(s):  
Forced Convection ◽  
Trabecular Meshwork ◽  
Transport Mechanism ◽  
Aqueous Humour ◽  
Excess Volume ◽  
Genetic Factors ◽  
Scientific Literature ◽  
Senile Cataract ◽  
Human Eye ◽  
Biochemical Constituents

Although the exact causes for presbyopia are not known with certainty, there is the general understanding that it is associated with aging. This is one of the major paradigms of science because the analysis of the symptoms observed during the treatment of presbyopia in the first author of this paper indicates that presbyopia is associated with metabolic dehydrated secretions that have accumulated in various parts of the eyes. As a process of accumulation it is not difficult to associate it statistically to aging. The metabolic secretions produced by the cells inside the human eye are accumulated simultaneously in the cornea, trabecular meshwork, in the lens and retina, subject only to its origin, however, the symptomatology is well characterized by the location of accumulation. Genetic factors are directly related to how the clumps of metabolic secretions occur and the accumulation form is very specific according to the movement of the eyes based on the activities performed by the patient, so any outcome is unpredictable. In this paper introduces the hypothesis that senile cataract may be caused by transport mechanism failure by forced convection of aqueous humour and metabolic mass produced by the lens cells. The evidence confirms the comparative interpretation of physiology and biochemical constituents of studies between old and young lenses published in scientific literature. Besides that the accumulation produces a loss of elasticity of the lens, due to excess volume and causes its opacity because the metabolic secretion is translucent. It shows evidence of the formation of floaters.

A New System For Optomanual Semiautomatic Quantitative Image Analysis

1977 ◽  
Vol 35 ◽  
pp. 210-211
Author(s):  
H.P. Rohr
Keyword(s):  
Image Analysis ◽  
Volume Density ◽  
List Type ◽  
Distribution Analysis ◽  
Type Number ◽  
Point Counting ◽  
Human Eye ◽  
Quantitative Image ◽  
Point Density ◽  
Electronic Counting

Today, in image analysis the broadest possible rationalization and economization have become desirable. Basically, there are two approaches for image analysis: The image analysis through the so-called scanning methods which are usually performed without the human eye and the systems of optical semiautomatic analysis completely relying on the human eye.The new MOP AM 01 opto-manual system (fig.) represents one of the very promising approaches in this field. The instrument consists of an electronic counting and storing unit, which incorporates a microprocessor and a keyboard for choice of measuring parameters, well designed for easy use.Using the MOP AM 01 there are three possibilities of image analysis:the manual point counting,the opto-manual point counting andthe measurement of absolute areas and/or length (size distribution analysis included).To determine a point density for the calculation of the corresponding volume density the intercepts lying within the structure are scanned with the light pen.

On the role of tin underlays for the prevention of thermal grooving in thin gold films

1986 ◽  
Vol 44 ◽  
pp. 732-733
Author(s):  
Jin Young Kim ◽  
R. E. Hummel ◽  
R. T. DeHoff
Keyword(s):  
Thin Film ◽  
Free Surface ◽  
Grain Boundary ◽  
Beneficial Effect ◽  
Failure Mechanism ◽  
Failure Mechanisms ◽  
Distinct Advantage ◽  
Gold Films ◽  
Gold Thin Film

Gold thin film metallizations in microelectronic circuits have a distinct advantage over those consisting of aluminum because they are less susceptible to electromigration. When electromigration is no longer the principal failure mechanism, other failure mechanisms caused by d.c. stressing might become important. In gold thin-film metallizations, grain boundary grooving is the principal failure mechanism.Previous studies have shown that grain boundary grooving in gold films can be prevented by an indium underlay between the substrate and gold. The beneficial effect of the In/Au composite film is mainly due to roughening of the surface of the gold films, redistribution of indium on the gold films and formation of In2O3 on the free surface and along the grain boundaries of the gold films during air annealing.

The Sensitiveness of the Human Eye

1913 ◽  
Vol 75 (1946supp) ◽  
pp. 247-247
Keyword(s):  
Human Eye

The Human Eye and the Photographic Camera

1913 ◽  
Vol 76 (1960supp) ◽  
pp. 51-51
Author(s):  
A. Gleichen
Keyword(s):  
Human Eye ◽  
Photographic Camera

Numerical Study of the Combined Free-Forced Convection and Mass Transfer Flow Past a Vertical Porous Plate in a Porous Medium with Heat Generation and Thermal Diffusion

2006 ◽  
Vol 11 (4) ◽  
pp. 331-343 ◽  
Author(s):  
M. S. Alam ◽  
M. M. Rahman ◽  
M. A. Samad
Keyword(s):  
Mass Transfer ◽  
Flow Field ◽  
Differential Equations ◽  
Forced Convection ◽  
Heat Generation ◽  
Numerical Study ◽  
Porous Plate ◽  
Integration Scheme ◽  
Suction Parameter ◽  
Transfer Flow

The problem of combined free-forced convection and mass transfer flow over a vertical porous flat plate, in presence of heat generation and thermaldiffusion, is studied numerically. The non-linear partial differential equations and their boundary conditions, describing the problem under consideration, are transformed into a system of ordinary differential equations by using usual similarity transformations. This system is solved numerically by applying Nachtsheim-Swigert shooting iteration technique together with Runge-Kutta sixth order integration scheme. The effects of suction parameter, heat generation parameter and Soret number are examined on the flow field of a hydrogen-air mixture as a non-chemical reacting fluid pair. The analysis of the obtained results showed that the flow field is significantly influenced by these parameters.

Diffuse Solar UV Radiation and Implications for Preventing Human Eye Damage¶

2001 ◽  
Vol 73 (2) ◽  
pp. 135 ◽  
Author(s):  
Alfio V. Parisi ◽  
Adele Green ◽  
Michael G. Kimlin
Keyword(s):  
Uv Radiation ◽  
Human Eye ◽  
Solar Uv Radiation ◽  
Eye Damage ◽  
Solar Uv
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