John W. Clark

Using a human cardiovascular-respiratory model to characterize cardiac tamponade and pulsus paradoxus (2009)

Ramachandran, Deepa, Luo, Chuan, Ma, Tony S, Clark, John W

Abstract Background Cardiac tamponade is a condition whereby fluid accumulation in the pericardial sac surrounding the heart causes elevation and equilibration of pericardial and cardiac chamber...

Detecting network communities by propagating labels under constraints (2009)

Barber, Michael J., Clark, John W.

We investigate the recently proposed label-propagation algorithm (LPA) for identifying network communities. We reformulate the LPA as an equivalent optimization problem, giving an objective function...

Many-body methods for nuclear systems at subnuclear densities (2007)

Sedrakian, Armen, Clark, John W.

This article provides a concise review of selected topics in the many-body physics of low density nuclear systems. The discussion includes the condensation of alpha particles in supernova envelopes,...

Nuclear Superconductivity in Compact Stars: BCS Theory and Beyond (2006)

Sedrakian, Armen, Clark, John W.

This chapter provides a review of microscopic theories of pairing in nuclear systems and neutron stars. Special attention is given to the mean-field BCS theory and its extensions to include effects...

Application Of Support Vector Machines To Global Prediction Of Nuclear Properties (2006)

Clark, John W., Li, Haochen

Advances in statistical learning theory present the opportunity to develop statistical models of quantum many-body systems exhibiting remarkable predictive power. The potential of such...

Pair condensation and bound states in fermionic systems (2005)

Sedrakian, Armen, Clark, John W.

We study the finite temperature-density phase diagram of an attractive fermionic system that supports two-body (dimer) and three-body (trimer) bound states in free space. Using interactions...

REVIEW GUIDED BY RESPONSE TIMES. (2005)

Brooks,Lloyd O., Clark,John W.

Junior college student subjects reviewed test questions which were selected on the basis of the amount of time each subject spent responding to these items previously. One group reviewed items they...

Strong Analytic Controllability for Hydrogen Control Systems (2004)

Lan, Chunhua, Tarn, Tzyh-Jong, Chi, Quo-Shin, Clark, John W.

The realization and representation of so(4,2) associated with the hydrogen atom Hamiltonian are derived. By choosing operators from the realization of so(4,2) as interacting Hamiltonians, a hydrogen...

Analytic Controllability of Time-Dependent Quantum Control Systems (2004)

Lan, Chunhua, Tarn, Tzyh-Jong, Chi, Quo-Shin, Clark, John W.

The question of controllability is investigated for a quantum control system in which the Hamiltonian operator components carry explicit time dependence which is not under the control of an external...

Control of Quantum Systems (2002)

Clark, John W., Lucarelli, Dennis G., Tarn, Tzyh-Jong

A quantum system subject to external fields is said to be controllable if these fields can be adjusted to guide the state vector to a desired destination in the state space of the system. Fundamental...

Threshold Disorder as a Source of Diverse and Complex Behavior in Random Nets (2002)

McGuire, Patrick C., Bohr, Henrik, Clark, John W., Haschke, Robert, Pershing, Chris, Rafelski, Johann

We study the diversity of complex spatio-temporal patterns in the behavior of random synchronous asymmetric neural networks (RSANNs). Special attention is given to the impact of disordered threshold...

RESPONSE TIME AS A FUNCTION OF RESPONSE MODE AND ITEM DIFFICULTY. (1998)

Brooks,Lloyd O., Clark,John W., Park,Brenda

Response modes typically were investigated as possible influences on posttest errors. Such investigation occurred in the present study; but, in addition, response-mode influences on performance...

LEARNING AS A FUNCTION OF RELATIONSHIP BETWEEN STUDENT RESPONSE TIMES AND DIFFICULTY OF INSTRUCTIONAL ITEMS: TWO REPLICATION EXPERIMENTS. (1998)

Brooks,Lloyd O., Clark,John W., Brown,William H.

In a recent laboratory experiment subjects who spent more learning time on difficult instructional relative to their own learning times on easy items, made fewer posttest errors in an analysis of...

STUDENT OBSERVATION OF INSTRUCTIONAL MATERIALS AS A FUNCTION OF RESPONSE MODE. (1998)

Brooks,Lloyd O., Clark,John W., Brown,William H.

In previous laboratory experiments subjects who spent more time reading and answering difficult instructional items relative to their own time on easy items, made fewer posttest errors. The first 17...

The theory of systems of strongly interacting particles. (1959)

Clark, John W.

Thesis (Ph. D.)--Washington University, 1959. Dept. of Physics.

IONIC REQUIREMENTS OF TREPONEMA PALLIDUM III. : Divalent Ions

Doak, G. O., Freedman, Leon D., Clark, John W.

Doak, G. O. (University of North Carolina, Chapel Hill), Leon D. Freedman, and John W. Clark, Jr. Ionic requirements of Treponema pallidum. III. Divalent ions. J. Bacteriol. 82:909–912....

Passage of Treponema pallidum Through Membrane Filters of Various Pore Sizes

Chandler, Francis W., Clark, John W.

The passage of Treponema pallidum through commercially available Millipore membrane filters of various pore sizes was examined. No microscopically detectable organisms passed through a filter with a...

Membrane Filtration of the Reiter Treponeme

Chandler, Francis W., Clark, John W.

A membrane filtration technique with commercially available membrane filters (Millipore Corp.) was effective for the removal of Reiter treponemes from liquids such as fluorescent-antibody conjugates,...

Statistical Approach to Evaluating the Method of Morgan and Vryonis for Enumerating Treponema pallidum

Artley, Charles W., Clark, John W.

The contributions of four components to the error in the microscopic enumeration of spirochetes (Treponema pallidum) by the method of Morgan and Vryonis were determined. Where Ns = the number of...

A Mathematical Study of Nerve Fiber Interaction

Clark, John W., Plonsey, Robert

This paper presents a quantitative description of the electric field interaction between two adjacent unmyelinated nerve fibers (one active, the other inactive) for the infinite medium and nerve...

Fiber Interaction in a Nerve Trunk

Clark, John W., Plonsey, Robert

This paper is concerned with the nature of the transmembrane potential induced in an inactive nerve fiber lying in an impressed potential field within a nerve trunk. The impressed potential field is...

IONIC REQUIREMENTS OF TREPONEMA PALLIDUM III. : Divalent Ions

Doak, G. O., Freedman, Leon D., Clark, John W.

Doak, G. O. (University of North Carolina, Chapel Hill), Leon D. Freedman, and John W. Clark, Jr. Ionic requirements of Treponema pallidum. III. Divalent ions. J. Bacteriol. 82:909–912....

Passage of Treponema pallidum Through Membrane Filters of Various Pore Sizes

Chandler, Francis W., Clark, John W.

The passage of Treponema pallidum through commercially available Millipore membrane filters of various pore sizes was examined. No microscopically detectable organisms passed through a filter with a...

Membrane Filtration of the Reiter Treponeme

Chandler, Francis W., Clark, John W.

A membrane filtration technique with commercially available membrane filters (Millipore Corp.) was effective for the removal of Reiter treponemes from liquids such as fluorescent-antibody conjugates,...

Statistical Approach to Evaluating the Method of Morgan and Vryonis for Enumerating Treponema pallidum

Artley, Charles W., Clark, John W.

The contributions of four components to the error in the microscopic enumeration of spirochetes (Treponema pallidum) by the method of Morgan and Vryonis were determined. Where Ns = the number of...

A Mathematical Study of Nerve Fiber Interaction

Clark, John W., Plonsey, Robert

This paper presents a quantitative description of the electric field interaction between two adjacent unmyelinated nerve fibers (one active, the other inactive) for the infinite medium and nerve...

Fiber Interaction in a Nerve Trunk

Clark, John W., Plonsey, Robert

This paper is concerned with the nature of the transmembrane potential induced in an inactive nerve fiber lying in an impressed potential field within a nerve trunk. The impressed potential field is...

A model of the L-type Ca2+ channel in rat ventricular myocytes: ion selectivity and inactivation mechanisms

Sun, Liang, Fan, Jing-Song, Clark, John W, Palade, Philip T

We have developed a mathematical model of the L-type Ca2+ current, which is based on data from whole-cell voltage clamp experiments on rat ventricular myocytes. Ion substitution methods were employed...