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On The Accuracy Of Psf Representation In Image Restoration, Andreas Savakis, H. Joel Trussell Jan 1993

On The Accuracy Of Psf Representation In Image Restoration, Andreas Savakis, H. Joel Trussell

Articles

Point spread function (PSF) models derived from physical optics provide a more accurate representation of real blurs than simpler models based on geometrical optics. However, the physical PSF models do not always result in a significantly better restoration, due to the coarse sampling of the recording device and insufficiently high signal-to-noise ratio (SNR) levels. Low recording resolutions result in aliasing errors in the PSF and suboptimal restorations. A high-resolution representation of the PSF where aliasing errors are minimized is used to obtain improved restorations. The SNR is the parameter which ultimately limits the restoration quality and determines the need for …


Controlling Chaos In Semiconductor Laser Devices, Athanasios Gavrielides, Vassilios Kovanis, Paul Alsing Jan 1993

Controlling Chaos In Semiconductor Laser Devices, Athanasios Gavrielides, Vassilios Kovanis, Paul Alsing

Articles

In most encounters, chaos is considered a nuisance, if not a downright detriment to system performance, especially in laser devices. However, the presence of chaos in a system can act as a rich source of complex frequencies if one only had a way of accessing them. In this work we present a discussion of the recent work of Ott, Grebogi and Yorke on controlling chaos as applied to a semiconductor diode laser subject to optical feedback via an external mirror. In the regime in which the laser is chaotic, stabilization can be achieved by sampling the output intensity and feeding …


Synchronization Of Chaotic Trajectories In A Diode Resonator Using Proportional Feedback, Timothy Newell, Paul Alsing, Athanasios Gavrielides Jan 1993

Synchronization Of Chaotic Trajectories In A Diode Resonator Using Proportional Feedback, Timothy Newell, Paul Alsing, Athanasios Gavrielides

Articles

We have demonstrated experimentally a proportional feedback algorithm for the synchronization of chaotic time signals generated from a pair of independent diode resonator circuits. Synchronization was easily obtained and occurred for relative feedback levels between three and eight percent of the driving voltage. Once established, the synchronization persisted throughout the whole range of the resonator bifurcation diagram without varying the gain of the feedback.


Using Computer Algebra Systems To Teach Linear Algebra, Maurino Bautista Jan 1993

Using Computer Algebra Systems To Teach Linear Algebra, Maurino Bautista

Articles

This article may be accessed from the Scholarly Journal Archive (additional fees may apply) at: http://links.jstor.org/sici?sici=0746-8342%28199311%2924%3A5%3C462%3ASR%3E2.0.CO%3B2-6&size=LARGE&origin=JSTOR-enlargePage A few years ago, David and Vivian Kraines [2] reviewed several commercially available software packages that can perform standard linear algebra computations. Most of these packages can perform only simple calculations on matrices of limited size (10 x 10 maximum) and all of them can do only either decimal or rational arithmetic. None has the ability to perform the symbolic calculations that are as much a part of linear algebra as arithmetic calculations. Computer algebra systems (CAS) like Maple and Mathematica can perform operations …


All Optical Timing Extraction With Frequency Division Using A Twin Section Laser Diode, Gerald Farrell, P. Phelan, Joe Hegarty, J. A. Shields Jan 1993

All Optical Timing Extraction With Frequency Division Using A Twin Section Laser Diode, Gerald Farrell, P. Phelan, Joe Hegarty, J. A. Shields

Articles

All-optical timing extraction from a coded line signal with division of the extracted clock frequency is demonstrated using a single twin-section self-pulsating laser diode. Either the bit-rate clock or a submultiple of the bit-rate clock can be extracted, depending only on the dc biases applied to the self-pulsating laser diode. Timing extraction is carried out for the first time without optical injection locking of the self-pulsating laser diode by the optical data source.


The Merger Puzzle, John A. Miller Jan 1993

The Merger Puzzle, John A. Miller

Articles

No abstract provided.


Suretyship On The Fringe: Suretyship By Operation Of Law And By Analogy, D. Benjamin Beard Jan 1993

Suretyship On The Fringe: Suretyship By Operation Of Law And By Analogy, D. Benjamin Beard

Articles

No abstract provided.


Lee V. Weisman: A New Age For Establishment Clause Jurisprudence?, Elizabeth Brandt Jan 1993

Lee V. Weisman: A New Age For Establishment Clause Jurisprudence?, Elizabeth Brandt

Articles

No abstract provided.


Animal Rights: The Frontiers Of Compassion, Henry Spira Jan 1993

Animal Rights: The Frontiers Of Compassion, Henry Spira

Articles

No abstract provided.


Shackle & Hoist: The Power Of Alternatives, Henry Spira Jan 1993

Shackle & Hoist: The Power Of Alternatives, Henry Spira

Articles

Few things in the decades-old horror show of farm animal-suffering have bothered all of us quite so much as shackling and hoisting. It should come as a relief to animal protectionists that the curtain is finally beginning to fall on the last grisly scenes of this archaic practice.

While our ideal remains the non-violent dinner table, the reality is that eating habits lend to change slowly. In terms of the "three Rs" this means that adopting a meatless diet for ethical reasons (Replacement) remains our long-term goal. In the short term our best bet is to also focus on eating …


Repointing Mortars For Conservation Of A Historic Stone Building In Trinity College, Dublin, Aidan Duffy, Tim P. Cooper, Simon H. Perry Jan 1993

Repointing Mortars For Conservation Of A Historic Stone Building In Trinity College, Dublin, Aidan Duffy, Tim P. Cooper, Simon H. Perry

Articles

With atmospheric pollution causing building stone to decay at accelerated rates, conservation of historic stone monuments is becoming an increasingly important issue. Mortar joints have a marked effect on how moisture moves in a wall and, hence, on how the wall weathers. Not only does mortar bind stones together, but also a good mortar will prevent the ingress of moisture (and pollutants), enable the buildings to dry out, accommodate movement and will not act as a source of harmful chemicals capable of attacking the surrounding stone. Thus, poor mortar can have deleterious effects on the stonework. This paper, which is …


The False Duality Of Efficiency And Predation In The Analysis Of Monopolizing Conduct, Mark Anderson Jan 1993

The False Duality Of Efficiency And Predation In The Analysis Of Monopolizing Conduct, Mark Anderson

Articles

No abstract provided.


Idaho Administrative Procedure Act: A Primer For The Practitioner, Dale Goble Jan 1993

Idaho Administrative Procedure Act: A Primer For The Practitioner, Dale Goble

Articles

No abstract provided.


Liars Should Have Good Memories: Legal Fictions And The Tax Code, John A. Miller Jan 1993

Liars Should Have Good Memories: Legal Fictions And The Tax Code, John A. Miller

Articles

No abstract provided.


The Eagle Bird: Mapping A New West, Dale Goble Jan 1993

The Eagle Bird: Mapping A New West, Dale Goble

Articles

No abstract provided.


The Influence Of The Unlocked Characteristics Of A Self-Pulsating Laser Diode On Synchronisation, Gerald Farrell, P. Phelan, Joe Hegarty Jan 1993

The Influence Of The Unlocked Characteristics Of A Self-Pulsating Laser Diode On Synchronisation, Gerald Farrell, P. Phelan, Joe Hegarty

Articles

All-optical synchronization and timing extraction based on self-pulsating twin section lasers has been demonstrated. We investigate the variation of the unlocked full-width at- half-maximum of the fundamental of the RF spectrum of a self-pulsating laser diode. We show for the first time that the value of the unlocked FWHM has a direct influence on the power required to maintain synchronization. We also show that the variation of the FWHM with frequency is dependent on the slope of the absorber bias versus self-pulsation frequency characteristic. The results have important implications for the design and selection of self-pulsating laser diodes for synchronization …


Blackmail From A To C, Joseph Isenbergh Jan 1993

Blackmail From A To C, Joseph Isenbergh

Articles

No abstract provided.


A Libel Story: Sullivan Then And Now (Reviewing Anthony Lewis, Make No Law: The Sullivan Case And The First Amendment (1991)), Elena Kagan Jan 1993

A Libel Story: Sullivan Then And Now (Reviewing Anthony Lewis, Make No Law: The Sullivan Case And The First Amendment (1991)), Elena Kagan

Articles

No abstract provided.


Irreversibility And The Law: The Size Of Firms And Other Organizations, Saul Levmore Jan 1993

Irreversibility And The Law: The Size Of Firms And Other Organizations, Saul Levmore

Articles

No abstract provided.


When Cities Go Broke: A Conceptual Introduction To Municipal Bankruptcy, Randal C. Picker, Michael W. Mcconnell Jan 1993

When Cities Go Broke: A Conceptual Introduction To Municipal Bankruptcy, Randal C. Picker, Michael W. Mcconnell

Articles

No abstract provided.


Blackmail, Privacy, And Freedom Of Contract, Richard A. Posner Jan 1993

Blackmail, Privacy, And Freedom Of Contract, Richard A. Posner

Articles

No abstract provided.


Four Feminist Theoretical Approaches And The Double Bind Of Surrogacy, Mary E. Becker Jan 1993

Four Feminist Theoretical Approaches And The Double Bind Of Surrogacy, Mary E. Becker

Articles

No abstract provided.


Autonomy And Distrust, Geoffrey R. Stone Jan 1993

Autonomy And Distrust, Geoffrey R. Stone

Articles

No abstract provided.


Rights And The System Of Freedom Of Expression, David A. Strauss Jan 1993

Rights And The System Of Freedom Of Expression, David A. Strauss

Articles

No abstract provided.


Presidential Interpretation Of The Constitution, David A. Strauss Jan 1993

Presidential Interpretation Of The Constitution, David A. Strauss

Articles

No abstract provided.


From The Mirror Of Reason To The Measure Of Justice, Mary Anne Case Jan 1993

From The Mirror Of Reason To The Measure Of Justice, Mary Anne Case

Articles

No abstract provided.


The Doubtful Constitutionality Of The Clinic Access Bill, Michael W. Mcconnell, Michael Stokes Paulsen Jan 1993

The Doubtful Constitutionality Of The Clinic Access Bill, Michael W. Mcconnell, Michael Stokes Paulsen

Articles

No abstract provided.


God Is Dead And We Have Killed Him: Freedom Of Religion In The Post-Modern Age, Michael W. Mcconnell Jan 1993

God Is Dead And We Have Killed Him: Freedom Of Religion In The Post-Modern Age, Michael W. Mcconnell

Articles

No abstract provided.


The Rules Of Evidence And The Rules Of Public Debate, Geoffrey R. Stone Jan 1993

The Rules Of Evidence And The Rules Of Public Debate, Geoffrey R. Stone

Articles

No abstract provided.


The Demand For Judicial Review, Frank H. Easterbrook Jan 1993

The Demand For Judicial Review, Frank H. Easterbrook

Articles

No abstract provided.