Leonard Rodberg - Academia.edu (original) (raw)

Uploads

Papers by Leonard Rodberg

142nd APHA Annual Meeting and Exposition (November 15 - November 19, 2014), Nov 17, 2014

ABSTRACT The Affordable Care Act has expanded coverage but it has done so without changing the ba... more ABSTRACT The Affordable Care Act has expanded coverage but it has done so without changing the basic context of health care in the United States. Health care has become ever more a market commodity rather than an essential human service provided in the context of health care as a human right. This session will describe the ways in which this the ACA has accelerated this transformation and what might be done to resist this transformation.

The Physics Teacher, May 1, 1969

Annals of Physics, Mar 1, 1960

ABSTRACT Calculations of Levinson and Banerjee using the direct-interaction model for the inelast... more ABSTRACT Calculations of Levinson and Banerjee using the direct-interaction model for the inelastic scattering of protons indicated that the optical potential seen by the scattered particle is weaker than for the corresponding elastic scattering process. In this paper the scattering amplitude is derived and the “1/A-corrections” to it are examined. It is shown that these represent corrections to the optical potential and arise from the requirement that the contribution of a given target nucleon to the optical potential be removed when that nucleon is interacting directly with the incident particle. It is shown that the short range, symmetry-dependence and spin-dependence of nuclear forces can make this an important correction and can explain the Levinson-Banerjee reduction. It is also shown that the strength of the effective two-body interaction, or t-matrix, is in good agreement with the strength found by Levinson and Banerjee. The distorted-wave direct-interaction model is therefore capable of predicting the absolute magnitude of the inelastic cross section.

Physical Review Letters, Nov 1, 1963

Low-energy, low-resolution neutron scattering experiments exhibit a well-known broad reso

ABSTRACT Papers based on research conducted by students in the Research Project, sponsored by the... more ABSTRACT Papers based on research conducted by students in the Research Project, sponsored by the Institute for Policy Studies, Washington Incluye bibliografía

U.S. Govt. Print. Off. eBooks, 1979

141st APHA Annual Meeting and Exposition (November 2 - November 6, 2013), Nov 4, 2013

ABSTRACT In the absence of action in Washington, DC toward real health care reform, attention has... more ABSTRACT In the absence of action in Washington, DC toward real health care reform, attention has turned toward the states. With Vermont leading the way, activists in New York, California, Minnesota and elsewhere are stepping up the pace. We will review what is happening on the ground in these centers of single-payer activity.

Annals of Physics, Sep 1, 1957

ABSTRACT The many-body problem has recently been studied by Brueckner and others using a self-con... more ABSTRACT The many-body problem has recently been studied by Brueckner and others using a self-consistent-field approach which includes the effects of two-body correlations. Unlike the older Hartree formulation, this method can be applied to particles which interact through strong, short-range forces. The Brueckner approximation is derived here using the methods of conventional perturbation theory; no previous knowledge of the Brueckner method is assumed. The theory is presented in a form which is suitable for application to finite media. The operator which describes the effective two-body interaction in a many-particle medium is introduced and discussed. The self-consistent potential is obtained; it is shown to minimize corrections to the lowest-order approximation, in which only two-particle correlations are included. The cancellation of higher-order “unlinked clusters” is demonstrated. Finally, a differential formulation of the method is derived.

American Journal of Physics, Apr 1, 1968

In order to make a cathode-ray tube display a television picture for providing a copy thereof, as... more In order to make a cathode-ray tube display a television picture for providing a copy thereof, as in a computer output device, a circuit produces dot-superposed signals for those portions of a television signal which provide half-tone areas of the picture. For a color television signal, the dot-superposed signals are derivable by storing the television signal for one field of frame and repeatedly reading the stored signal. The read-out signals are preferably emphasized at the subcarrier frequency. For a monochrome television signal, a signal is generated and inversed. For a generated signal of an even multiple of the horizontal scanning frequency, a phase-adjusted signal is produced by selecting either the generated signal in every other line period of the respective frames and the inversed signal in the remaining line periods or the generated and inversed signals in every other field and the remaining fields, respectively. For a generated signal of an odd multiple of the line frequency, the phase-adjusted signal is produced by selecting the generated and inversed signals in every other frame and the remaining frames. Responsive to the phase-adjusted signal, the television signal is modulated to have a maximum amplitude at the black and white levels and a minimum amplitude at the above-mentioned portions. For modulation, the television signal may be preliminarily modified to have a minimum level at the black and white levels and a maximum level at a level bisecting the black and white levels.

Review of Radical Political Economics, Apr 1, 1977

This paper analyzes the nature of the health care industry and its role within the capitalist sys... more This paper analyzes the nature of the health care industry and its role within the capitalist system. By developing an understanding of this relation ship, we should be able to understand more fully the internal dynamics of the health care system and to develop mutually supportive movements for change within and outside it. The form and dynamics of the health care system are grounded in class struggle. The transformation of health care into a commodity, and the production of surplus value in the health care industry, are central fea tures of contemporary health care organization. The health care industry performs four interrelated economic functions: accumulation, provision of investment opportunities, absorption of surplus labor, and maintenance of the labor force. It also has important ideological functions of systemic legitimation, social control, and reproduction of the capitalist class structure.

Bulletin of the atomic scientists, Nov 1, 1969

Advancing technology is making obsolescent many of the older ideas on international arms control.... more Advancing technology is making obsolescent many of the older ideas on international arms control. If there is to be any hope of limiting strategic weapons, governments must refrain unilaterally from introducing new ones. Professor Rodberg is a physicist ot the University of Maryland.

Physical Review, Jun 1, 1957

The production of a single pion in pion-nucleon collisions has been studied by using the Chew-Low... more The production of a single pion in pion-nucleon collisions has been studied by using the Chew-Low formalism with ^>-wave coupling. The equation for the T-matrix is solved by using the one-meson approximation. The solution is used to compute the cross sections for pion production and the two-meson corrections to the scattering equation of Chew and Low. The production cross sections show a peak due to overlapping final-state resonances, but have a magnitude of less than 2 mb, compared to the observed inelastic cross sections of about 20 mb (near 1 Bev). The two-meson corrections to scattering are found to be quite small.

The produc~ion of a single p-wave pion in pion-nucleon collisions has been studied using the Chew... more The produc~ion of a single p-wave pion in pion-nucleon collisions has been studied using the Chew-Low-Wick formalism. This theory is a low-energy, static-source theory. The purposes of this study are: to determine the ability of the theory to handle high-energy processes; to determine the effects of high-energy processes upon the low-energy predictions of the theory; a.nd to obtain information on the behavior of the production cross-section. An equation has been derived which, in the one-intermediatemeson approximation, gives the matrix element for meson production in terms of the matrix element for scattering. This equations exhibits a crossing symmetry under a time reversal of one of the outgoing mesons. The angular momentum a.nd isotopic spin dependences have been extracted. This allows one to take advantage of the conservation of the total angular momentum and total isotopic spin, and to use the symmetry of the theory between angular momentum and isotopic spin. The resulting equations have the form of twenty coupled integral equations; they are uncoupled by neglecting integrals containing non-resonant denominators. Solutions have been obtained by including scattering 1n only the T = J = 3/2 state. The resulting production cross-section for ff-incident on protons shows a peak. for an incident energy of 700 Mev. For energies in this region, each outgoing meson can attain the 33-resonant energy relative to the nucleon. The peak is the result of this "two-particle resonance". The one-meson approximation does not maintain the requirements of unitarity. It is found that the production cross-sections violate unitarity in the region of 500 Mev. This is attributable to the inadequacies of the one-meson approximation and to the fact that high-energy scattering effects are important. The equation for the production matrix element shows that the high-energy scattering amplitudes act to damp the production cross-section. The solutions for meson production have been used to examine the two-meson corrections to the equation for the scattering matrix element. These corrections are small relative to the scattering amplitude for the 33-state, but large relative to the amplitudes for the 11-and 13-atates. The equation for the matrix element describing the photoproduction of two p-wave pions has been derived. All quantities involved have been expressed 1n terms of multipoles. The structure of the equation is identical with the equation for meson production, leading to the belief that double photoproduction will show a peak for incident photon energies of about 800 Mev.