Comprehensive model for fine Coulomb fission of liquid droplets charged to Rayleigh limit

The liquid droplets produced by atomization processes are believed to undergo substantial supercooling during solidification, because the catalytic heterogeneities, for statistical reasons, tend to be isolated in the larger droplets. This supercooling can lead to the nucleation of metastable phases. As part of a study on the effect of liquid supercooling on nonequilibrium solidification, three binary Fe-Ni alloys have been produced by conventional argon atomization (Fe-20Ni, Fe-30Ni, and Fe-40Ni). The primary variables in these experiments are: i) the alloy composition; and ii) the powder particle diameter (inversely proportional to supercooling). Of particular interest in this system is the competitive nucleation kinetics between the stable fee and metastable bec phases. Bcc is expected to nucleate preferentially with decreasing %Ni and decreasing particle diameter.

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HREM observation of NiO growth on submicron spheres of pure nickel

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100154718 ◽

1989 ◽

Vol 47 ◽

pp. 548-549

Author(s):

C.M. Teng ◽

T.F. Kelly ◽

J.P. Zhang ◽

H.M. Lin ◽

Y.W. Kim

Keyword(s):

Nickel Oxide ◽

Grain Boundaries ◽

Pure Nickel ◽

Submicron Particles ◽

Crystal Formation ◽

Nickel Wire ◽

Liquid Droplets ◽

Oxide Interface ◽

Nickel Chromium ◽

Chromium Alloys

Spherical submicron particles of materials produced by electrohydrodynamic (EHD) atomization have been used to study a variety of materials processes including nucleation of alternative crystallization phases in iron-nickel and nickel-chromium alloys, amorphous solidification in submicron droplets of pure metals, and quasi-crystal formation in nickel-chromium alloys. Some experiments on pure nickel, nickel oxide single crystals, the nickel/nickel(II) oxide interface, and grain boundaries in nickel monoxide have been performed by STEM. For these latter studies, HREM is the most direct approach to obtain particle crystal structures at the atomic level. Grain boundaries in nickel oxide have also been investigated by HREM. In this paper, we present preliminary results of HREM observations of NiO growth on submicron spheres of pure nickel.Small particles of pure nickel were prepared by EHD atomization. For the study of pure nickel, 0.5 mm diameter pure nickel wire (99.9975%) is sprayed directly in the EHD process. The liquid droplets solidify in free-flight through a vacuum chamber operated at about 10-7 torr.

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Can a Theory of Suicide Predict All “Suicides” in the Elderly?

Crisis ◽

10.1027//0227-5910.24.1.7 ◽

2003 ◽

Vol 24 (1) ◽

pp. 7-16 ◽

Cited By ~ 3

Author(s):

Antoon A. Leenaars

Keyword(s):

Sigmund Freud ◽

Terminally Ill ◽

Later Life ◽

Psychological Theory ◽

The Elderly ◽

Theory Building ◽

Personality Factors ◽

Comprehensive Model ◽

Suicide Notes ◽

Psychiatric Study

Summary: Older adults consistently have the highest rates of suicide in most societies. Despite the paucity of studies until recently, research has shown that suicides in later life are best understood as a multidimensional event. An especially neglected area of research is the psychological/psychiatric study of personality factors in the event. This paper outlines one comprehensive model of suicide and then raises the question: Is such a psychiatric/psychological theory applicable to all suicides in the elderly? To address the question, I discuss the case of Sigmund Freud; raise the topic of suicide and/or dignified death in the terminally ill; and examine suicide notes of the both terminally ill and nonterminally ill elderly. I conclude that, indeed, greater study and theory building are needed into the “suicides” of the elderly, including those who are terminally ill.

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A Comprehensive Model for Assessing Service-Learning and Community-University Partnerships

New Directions for Higher Education ◽

10.1002/he.13.abs ◽

2001 ◽

Vol 2001 (114) ◽

pp. 51 ◽

Cited By ~ 21

Author(s):

Barbara A. Holland

Keyword(s):

Service Learning ◽

Comprehensive Model ◽

University Partnerships

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A Comprehensive Model for Medical Information Processing

Methods of Information in Medicine ◽

10.1055/s-0038-1635429 ◽

1983 ◽

Vol 22 (03) ◽

pp. 124-130 ◽

Cited By ~ 11

Author(s):

J. H. Bemmel

Keyword(s):

Intensive Care ◽

Information Processing ◽

Medical Information ◽

Computer Applications ◽

Human Interaction ◽

Comprehensive Model ◽

Computers In Medicine ◽

Medical Information Systems ◽

Research And Education ◽

The Many

At first sight, the many applications of computers in medicine—from payroll and registration systems to computerized tomography, intensive care and diagnostics—do make a rather chaotic impression. The purpose of this article is to propose a scheme or working model for putting medical information systems in order. The model comprises six »levels of complexity«, running parallel to dependence on human interaction. Several examples are treated to illustrate the scheme. The reason why certain computer applications are more frequently used than others is analyzed. It has to be strongly considered that the differences in complexity and dependence on human involvement are not accidental but fundamental. This has consequences for research and education which are also discussed.

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