VITA
NAME:	L. David Roper
ACADEMIC RANK:	Professor Emeritus of Physics
DEPARTMENT:	Physics, Virginia Polytechnic Institute and State University (Virginia Tech)

Contents: Professional Societies | Public Service | Books | Particle Physics Pubs
Biophysics Pubs | Interdisciplinary Pubs/Web Pages | Teaching Pubs

FIELDS OF INTEREST:

Elementary Particle Physics (Particle scattering phenomenology)

Computational Physics

Future Studies (Resource depletion)

DEGREES:

A.B. with Honors (Physics & Math; Chemistry minor) Profile in Excellence Award 1985	Oklahoma Baptist University (1958)
Ph.D. (Theoretical Physics)	Massachusetts Institute of Technology (1963)

PROFESSIONAL EXPERIENCE

• 1958-62: Teaching Assistant, Physics Department, Massachusetts Institute of Technology, Cambridge, Massachusetts
• 1959-60(summers): Research Physicist, Sandia Corporation, Albuquerque, New Mexico
• 1962-63(summers): Research Physicist, Lawrence Radiation Laboratory, Livermore, California
• 1962-63: Instructor, Physics Department, Eastern Nazarene College, Quincy, Massachusetts
• 1962-63: Research Assistant, Physics Department, Massachusetts Institute of Technology, Cambridge, Massachusetts
• 1963-65: Postdoctoral Appointee, Lawrence Radiation Laboratory, Livermore, California
• 1965-67: Assistant Professor, Physics Department, Kentucky Southern College, Louisville, Kentucky
• 1967-70: Assistant Professor, Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia
  • Along with Dr. Richard Allan Arndt.
• Summer 1968: Summer Faculty Position, Lawrence Radiation Laboratory, Livermore, California
• 1970-74: Associate Professor, Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia
• 1973-74: Research Physicist, International Centre for Theoretical Physics, Trieste, Italy; CERN, Geneva, Switzerland; University of Glasgow, Glasgow, Scotland
• 1974-98: Professor, Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia
• 1977-78: Acting Head, Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia
• 1980-81: Visiting Professor, KEK National Laboratory for High Energy Physics, Oho, Tsukuba, Ibaraki, Japan
• 1983: Visiting Senior Lecturer, University of Papua New Guinea, Port Moresby: Papua New Guinea
• 1984: Associate Director for Academic Computing, Computing Center, Virginia Polytechnic Institute and State University, Blacksburg, Virginia
• 1987-88: Visiting Professor, Department of Physics, Universidade Federal de Goiás, Goiânia, Goiás, Brasil
• 1990-94: Head, Physics Department, Virginia Polytechnic Institute and State University , Blacksburg , Virginia
• 1996-98: Pre-retirement leave at half pay with no duties.

PROFESSIONAL SOCIETIES

• Fellow of American Physical Society
• American Association of Physics Teachers
  • Chairman of Committee on Physics in Higher Education 1978-1980
  • Associate Editor of American Journal of Physics 1979-82

PUBLIC SERVICE

• Blacksburg Community Band: Bass Trombonist (1989-2012)
• Habitat for Humanity of the New River Valley
  • Member of Board of Directors (1994-2008)
  • President (1995-7); Chair Church Relations (1997-2000); Treasurer (1998-2006)
  • Internet Coordinator (1995-2008)
  • Newsletter Editor (1999-2002)
  • Co-founder of ReStore of the NRV Habitat for Humanity 2007
  • ReStore Committee (2007-)
• New River Family Shelter (NRFS)
  • Internet Coordinator (1995-2008)
• Montgomery County Emergency Assistance Program (MCEAP)
  • Member of Board of Directors (1997-2008)
  • Internet Coordinator (1997-2008)
  • Secretary (2006-8)
• Valley Interfaith Child Care Center
  • Cofounder (2003)
  • Member of Board of Directors (2003-11)
  • Internet Coordinator (2003-5)
  • Facilities Coordinator (2003-11)
• Christ Episcopal Church, Blacksburg VA
  • Lector (1995-2004)
  • Internet Coordinator (1995-1998)
  • Actor in Divinity Players (1997-2001)
• tHe Book Group (men's group) (~1980-), Blacksburg VA: Coordinator (1999-2012)
• YMCA at Virginia Tech Open University
  • Genealogy instructor (2000-2001)
  • Hybrid and Electric Vehicles instructor (2005-2007)
  • Solar Greenhouses instructor (2009)
• Elderhostel at Mountain Lake genealogy instructor (2001-2002)
• Lecturer on Global Warming and Hybrid Vehicles to service clubs in the New River Valley (2006-2009)
• Sustainable Blacksburg
  • Steering Committee (2007-2010)
  • Treasurer (2008-11; 2013-2018)
  • Board of Directors (2007-11; 2013-2018)
  • Core Advisor Group (2010-11)
• YMCA at Virginia Tech
  • Conceptual designer of YMCA Roper Solar Greenhouse (2007200-8)
  • Roper Solar Greenhouse steering committee (2008-2009)
• Town of Blacksburg
  • Cool-Cities proposal to Town Council adopted 2006
  • Mayor's Task Force on Climate Protection and Sustainability (2008-2010)
• Leading Lights of the New River Valley nominee for 2011 & 2012
• Lifetime Achievement Award from Leading Lights of the New River Valley 2020
• Public education about Global Warming (2006-2023)
• Promotion of battery electric vehicles
  • Electric cars (BEVs) (2012-2023)
  • Electric tricycles for seniors (etrikes) (2022-)

BOOKS

• The Dirac Delta Function in Physics: A Programmed Booklet and Reference Document for Students, L. D. Roper, Commission on College Physics, American Institute of Physics, N.Y., 1971.
• The Dirac Delta Function in Physics with Applications, L. D. Roper, University Publications, Blacksburg, Virginia, 1972.
• Simple Membrane Electrodiffision Theory, R. A. Arndt and L. D. Roper, University Publications, Blacksburg, Virginia, 1972.
• The Metals and Mineral Fuels Crises: Facts and Predictions, R. A. Arndt and L. D. Roper, University Publications, Blacksburg, Virginia, 1976. (book and three audiocassettes)
• Where Have All the Metals Gone?, L. D. Roper, University Publications, Blacksburg, Virginia, 1976.
• The Depletion of United States and World Mineral Resources, R. A. Arndt and L. D. Roper, University Publications, Blacksburg, Virginia, 1977

PARTICLE PHYSICS PUBLICATIONS

• Pion-Nucleon Phase-Shift Analysis, B. T. Feld and L. D. Roper, Proceedings of the Siena International Conference on Elementary Particles, Italian Phys. Soc., Bologna, p. 400 (1963).
• Evidence for a P₁₁ Pion-Nucleon Resonance at 556 MeV, L. D. Roper, Phys. Rev. Letters 12, 340 (1964). (At Dr. Michael Moravcsik's request, Prof. Bernard Feld, LDR's thesis advisor at MIT, agreed that Dr. L. David Roper's name should be the only author of this paper. As a result this resonance is widely informally known as the "Roper resonance".)
• Energy-Dependent Pion-Nucleon Phase-Shift Analysis, L. D. Roper, R. M. Wright and B. T. Feld, Phys. Rev. 139, B190 (1965). (Dr. Michael Moravcsik, of Lawrence Radiation Laboratory, was a major advisor to Dr. L. David Roper for this research, but declined to have his name added to the authorship. Mr. Robert Wright, of Lawrence Radiation Laboratory,was the major computer programmer for this research.)
• Pion-Nucleon Phase-Shift Analysis: 0-350 MeV, L. D. Roper and R. M. Wright, Phys. Rev. 138, B921 (1965).
• Review of the Pion-Nucleon Experimental Situation and its Phase-Shift Interpretation, V. Perez-Mendez and L. D. Roper, Lectures in Theoretical Physics, Vol. VIIB-Elementary Particles, Univ. of Colorado Press, Boulder, p. 452 (1965).
• Pion-Nucleon Phase-Shift Analyses, L. D. Roper, Proceedings of the Williamsburg Conference on Intermediate Energy Physics, The College of William and Mary, Williamsburg, Va., Vol. II, p. 495 (1966).
• Comparison of Recent Pion-Nucleon Phase-Shift Analyses, L. D. Roper, Forts. der Phys. 14, 305 (1966).
• Spin Rotation Parameters and Phase-Shift Ambiguities in Pion-Nucleon Scattering, L. D. Roper and D. S. Bailey, Phys. Rev. 155, 1744 (1967).
• K®2p Phenomenology and Small CP Nonconservation, L. D. Roper, Phys. Rev. 176, 2120 (1968).
• Deuteron Constraints on Low-Energy Nucleon-Nucleon Scattering Analyses, R. A. Arndt and L. D. Roper, Phys. Rev. D1, 129 (1970).
• Elastic Neutron-Alpha Scattering Analyses, R. A. Arndt and L. D. Roper, Phys. Rev. C1, 903 (1970).
• Analyses of Elastic Proton-Alpha Scattering, R. A. Arndt, L. D. Roper and R. L. Shotwell, Phys. Rev. C3, 2100 (1971).
• Phenomenology of K®2p Decays, M. C. Rasmussen and L. D. Roper, Phys. Rev. D4, 1401 (1971).
• Comparison of Princeton-Pennsylvania np Scattering Data by Phase Shift Analyses, R. A. Arndt and L. D. Roper, Phys. Rev. Letters 26, 1260 (1971).
• Comparison of Various
• A Multichannel Look at the Available Partial-Wave Analyses of the System in the Region 0-1400 MeV/c, M. L. Gupta, R. A. Arndt and L. D. Roper, Nuc. Phys B37, 173 (1972).
• Polarization Measurements and Analysis in n-a Scattering from 11.0 to 30.3 MeV, W. B. Broste, G. S. Mutchler, J. E. Simmons, R. A. Arndt and L. D. Roper, Phys. Rev. C5, 761 (1972).
• The Use of Partial-Wave Representations in the Planning of Scattering Measurements: Application to 330 MeV np Scattering, R. A. Arndt and L. D. Roper, Nuc. Phys. B50, 285 (1973).
• Nucleon-Alpha Elastic Scattering Analyses I. Low-Energy n-a and p-a Analyses, R. A. Arndt, D. D. Long and L. D. Roper, Nuc. Phys. A209, 429 (1973).
• Nucleon-Alpha Elastic Scattering Analyses II. 0 to 21 MeV Energy-Dependent n-a Analysis, R. A. Arndt and L. D. Roper, Nuc. Phys. A209, 447 (1973).
• Application of the Accelerated-Convergence Expansion to Pion-Nucleon Scattering, R. A. Arndt, R. H. Hackman and L. D. Roper, Phys. Rev. Letters 32, 31 (1974).
• Nucleon-Nucleon Scattering Analyses I. Proton-Proton Scattering from 1 to 500 MeV, R. A. Arndt, R. H. Hackman and L. D. Roper, Phys. Rev. C9, 555 (1974).
• Effects of Coulomb Rotation on the pp Forward Scattering Amplitude from 0-500 MeV, R. A. Arndt, R. H. Hackman and L. D. Roper, Phys. Rev. C9, 2050 (1974).
• Resonance Pole with , in a Coupled Channel Analysis of K⁺-p Elastic Scattering Data, A. Arndt, R. H. Hackman, L. D. Roper and P. H. Steinberg, Phys. Rev. Letters 33, 987 (1974).
• The Development of Pion-Nucleon Scattering Analysis: A Personal History of Discovery, R. Gordon Moorhouse and L. David Roper
• Nonleptonic Decays of Hadrons and the Rule, R. A. Arndt and L. D. Roper, Phys. Rev. D11, 4471 (1975).
• Nucleon-Nucleon Scattering Analyses II. Neutron-Proton Scattering from 0 to 425 MeV and Proton-Proton Scattering from 1 to 500 MeV, R. A. Arndt, R. H. Hackman and L. D. Roper, Phys. Rev. C15, 1002 (1977).
• Nucleon-Nucleon Scattering Analyses III. np Phase-Shift Analyses Complex Structure and Multiple Solutions at 50 MeV and 325 MeV R. A. Arndt, R. H. Hackman and L. D. Roper, Phys. Rev. C15, 1021 (1977).
• The Delta Mass Splitting from Pion-Nucleon Partial-Wave Analyses, V. S. Zidell, R. A. Arndt and L. D. Roper, Lettere al Nuovo Cimento, 21, 140 (1978).
• K⁺-p Scattering Analysis to 2 GeV/c, R. A. Arndt, L. D. Roper and P. H. Steinberg, Phys. Rev. D18, 3278 (1978).
• Scattering Analyses Interactive Dial-in (SAID), R. A. Arndt, L. D. Roper (1978). Also
• Pion-Nucleon Phase-shift Analysis: 0-350 MeV, V. S. Zidell, R. A. Arndt and L. D. Roper, Phys. Rev. D21, 1255 (1980).
• Determination of the Pion-Nucleon Scattering Lengths from Partial-Wave Analyses, V. S. Zidell, R. A. Arndt and L. D. Roper, Phys. Rev. D21, 1289 (1980).
• Existence of Dibaryon Resonances in I=1 and Nucleon-Nucleon Scattering, Bhandari, R. A. Arndt, L. D. Roper and B. J. VerWest, Phys. Rev. Letters 46, 1111 (1981).
• Parametrizing the Nucleon-Nucleon Scattering Matrix above the Inelastic Threshold, R. A. Arndt and L. D. Roper, Phys. Rev. D25, 2011 (1982).
• Review of Particle Properties (Particle Data Group), M. Roos, F. C. Porter, M. Aguilar-Benitez, Montanet, Ch. Walck, R. L. Crawford, R. L. Kelly, A. Rittenberg, T. G. Trippe, G. Wohl, G. P. Yost, T. Shimada, M. J. Losty, G. P. Gopal, R. E. Hendrick, R. E. Schrock, R. Frosch, L. D. Roper, B. Armstrong, Phys. Lett. 111B, (1982).
• Elementary Particle Resonances from a Semiclassical Perspective, R. A. Arndt and L. D. Roper, Am. J. Phys. 51, 418 (1983).
• Nucleon-Nucleon Partial-Wave Analysis to 1 GeV, R. A. Arndt, L. D. Roper, R. A. Bryan, R. B. Clark, B. J. VerWest and P. Signell, Phys. Rev. D28, 97-122 (1983).
• Review of Particle Properties (Particle Data Group), C. G. Wohl, R. N. Cahn, A. Rittenberg, T. G. Trippe, G. P. Yost, F. C. Porter, J. J. Hernandez, L. Monanet, R. E. Hendrick, R. L. Crawford, M. Roos, N. A. Törnqvist, G. Höhler, M. Aguilar-Benitez, T. Shimada, M. J. Losty, G. P. Gopal, Ch. Walck, R. E. Shrock, R. Frosch, L.D. Roper, W. P. Trower, B. Armstrong, Rev. Mod. Phys. 56, Part II (1984).
• K⁺-Proton Partial-Wave Analysis to 3 GeV/c, R. A. Arndt and L. D. Roper, Phys. Rev. D31, 2230-2241 (1985).
• Pion-Nucleon Partial-Wave Analysis to 1100 MeV, R. A. Arndt, John M. Ford and L. D. Roper, Phys. Rev. D32, 1085-1103 (1985).
• Review of Particle Properties (Particle Data Group), M. Aguilar-Benitez, F. C. Porter, J. J. Hernandez, L. Montanet, R. L. Crawford, G. Höhler, R. M. Barnett, A. Rittenberg, T. G. Trippe, C. G. Wohl, G. P. Yost, B. Armstrong, G. S. Wagman, T. Shimada,P. Gopal, J. Primack, K. G. Hayes, R. H. Schindler, R. E. Shrock, R. A. Eichler, R. Frosch, L. D. Roper and W. P. Trower, Phys. Letters 170B (1986).
• Nucleon-Nucleon Partial-Wave Analysis to 1100 MeV, R. A. Arndt, John S. Hyslop III and L. D. Roper, Phys. Rev. D35, 128-144 (1987).
• Review of Particle Properties (Particle Data Group), G. P. Yost, R. M. Barnett, I Hinchliffe, G. R. Lynch, A. Rittenberg, M. Suzuki, T. G. Trippe, C. G. Wohl, B. Armstrong, G. S. Wagman, F. C. Porter, L. Montanet, M. Aguilar-Benitez, J. J. Hernandez, G. Conforto, R. L. Crawford, K. R. Schubert, M. Roos, N. A. Törnqvist, G. Höhler, K. Hagiwara, S. Kawabata, D. M. Manley, K. A. Olive, K. G. Hayes, R. H. Schindler, J. Cabrera, R. E. Shrock, R. A. Eichler, L. D. Roper and W. P. Trower, Phys. Letters 204 (1988).
• Scattering in a Spherical Potential: Motion of Complex-Plane Poles and Zeros, R. A. Arndt and L. D. Roper, Computers in Phys. 3, 65-72 (1989).
• Determination of the pNN Coupling Constant from Elastic Pion-Nucleon Scattering Data, R. A. Arndt, Z. Li, L. D. Roper and R. L. Workman, Phys. Rev. Letters 65, 157-158 (1990).
• Partial-Wave Analysis of Pion Photoproduction, R. A. Arndt, R. L. Workman, Z. Li and L. D. Roper, Phys. Rev. C42, 1853-1863 (1990).
• Pion Photoproduction Resonance Couplings in the Second Resonance Region, R. A. Arndt, R. L. Workman, Z. Li and L. D. Roper, Phys. Rev. C42, 1864-1866 (1990).
• Pion-Nucleon Partial-Wave Analysis to 2 GeV, R. A. Arndt, Z. Li, L. D. Roper, R. L. Workman and J. M. Ford, Phys. Rev. D43, 2131 (1991).
• Pion-Nucleon Coupling Constant, R. A. Arndt, Z. Li, L. D. Roper and R. L. Workman, Phys. Rev. D44, 289-290 (1991).
• Resonance Photon-Decay Amplitudes, Z. Li, R. A. Arndt, L. D. Roper and R. L. Workman, Hadron '91 Conference proceedings.
• Determination of pNN coupling constant from elastic pion-nucleon scattering data-comment reply, R. A. Arndt, Z. Li, L. D. Roper and R. L. Workman, Phys. Rev. Lett. 68, 549 (1992).
• Nucleon-nucleon partial-wave analysis to 1.6 GeV, R. A. Arndt, L. D. Roper, R. L. Workman and M. W. McNaughton, Phys. Rev. D45, 3995-4001 (1992).
• Partial-wave analysis of K⁺-nucleon scattering, J. S. Hyslop, R. A. Arndt, L. D. Roper, and R. L. Workman, Phys. Rev. D46, 961-969 (1992).
• Partial-Wave Analyses of Hadron Scattering Below 2 GeV: Progress Report May 1992-April 1993, R. A. Arndt, L. D. Roper and Ron L. Workman, Nov 1992
• Resonance photodecay amplitudes to 1.8 GeV, Z. Li, R. A. Arndt, L. D. Roper, and R. L. Workman, Phys. Rev. D47, 2759-2763 (1993).
• Dick Arndt's contribution to pion-nucleon scattering analyses, L. David Roper, 6th International Workshop on Pion/Nucleson Partial-Wave Analysis and the Interpretation of Baryon Resonances, 23-27 May 2011, Georgetown University, Washington, DC
• http://roperld.com/science/RoperResonance60thAnniversary.pdf

BIOPHYSICS PUBLICATIONS

• Nerve Radiation and the Dipole Model-Letter, R. A. Arndt and L. D. Roper, Biophys. J. 10, 1125 (1970).
• An Exact Constant-Field Solution for a Simple Membrane, R. A. Arndt, J. D. Bond and L. D. Roper, Biophys. J. 10, 1149 (1970).
• Numerical Solution of Steady-State Electrodiffusion Equations for a Simple Membrane, R. A. Arndt, J. D. Bond and L. D. Roper, Biophys. J. 11, 265 (1971).
• Theory of Initial Current Density in Membrane Voltage-Clamp Experiments, R. A. Arndt and L. D. Roper, Bull. Math. Biophys. 34, 45 (1972).
• A Fit to Nerve Membrane Rectification Curves with a Double-Dipole-Layer Membrane Model, R. A. Arndt, J. D. Bond and L. D. Roper, Bull. Math. Biophys. 34, 151 (1972).
• Electroneutral Approximate Solution of Steady-State Electrodiffusion Equations for a Simple Membrane, R. A. Arndt, J. D. Bond and L. D. Roper, J. Theor. Biol. 34, 265 (1972).
• Quantitative Comparison of Dipole Models for Steady-State Currents in Excitable Membranes, R. A. Arndt and L. D. Roper, Bull. Math. Biophys. 34, 305 (1972).
• Numerical Solution of Time-Dependent Electrodiffusion Equations for a Simple Membrane, R. A. Arndt and L. D. Roper, Math. Biosci. 16, 103 (1973).
• A New Phenomenology for Squid Axon Voltage-Clamp Currents, R. A. Arndt and L. D. Roper, J. Theor. Biol. 48, 373 (1974).
• Theory of Excitable Membranes I. A Simple Model for a Three-State Artificial Membrane, R. A. Arndt and L. D. Roper, J. Theor. Biol. 54, 249 (1975).
• Voltage-Clamp Experiments on Oxidized Cholesterol Membranes Modified with Excitability-Inducing Material and Comparison with a Model, R. A. Hoffman, D. D. Long, R. A. Arndt and L. D. Roper, Biochim. Biophys. Acta 455, 780 (1976).

INTERDISCIPLINARY PUBLICATIONS

• Priorities in a Society, L. D. Roper, Bull. Menninger Clinic 35, 42 (1971).
• Correlation Studies of Academic Excellence and Big-Time Athletics, L. D. Roper and K. Snow, Intern. Rev. Sport Soc. 3(11), 57 (1976)
• Production-History Projections of Fuels and Some Crucial Metals in the United States, R. A. Arndt and L. D. Roper, Energy 2, 293 (1977).
• Depletion Categories of United States Metals, L. D. Roper, Materials and Society 2, 217 (1978).
• Depletion of Nonrenewable Resources, L. D. Roper, Amer. J. of Phys. 47, 467 (1979).
• Advanced Metals Depletion in the United States, L. D. Roper, Technology Tomorrow 3, No. 1, p. 2, February, 1980.
• Permanent Magnet Motors, L. D. Roper and B. Dennison, Spectrum, No. 16, p. 3, January 24, 1980.
• The Role of Petroleum Reserves in the Development of the Mexican Economy, R. Valdes-Flores, W. Hibbard and L. D. Roper, Materials and Society 4, 443 (1980).
• Long-Term Energy Production and Global Heat Pollution, L. David Roper and Daniel Nagle (1980/2006).
• Comparing the Relative Convenience of Non-Commute Trips in Battery Electric Vehicles and Internal Combustion Engine Vehicles in the Contiguous United States, J. D. Starner, L. W. Carstensen, K. Kolivras, D. Bosch, L. D. Roper, 2023.
• The Goiânia Radiation Incident, A Failure of Science and Society, Marco Antônio Sperb Leite and L. David Roper, 1988
• Minerals Depletion
• Income Distribution in the United States: A Quantitative Study
• Genealogy of Several Families: http://www.roperld.com/
• Politics
• Physics of Automobile Rollovers
• Commentaries and Letters by L. David Roper in The Roanoke Times
• Interdisciplinary Studies
• Roper Solar Greenhouse

TEACHING PUBLICATIONS AND REPORTS

• Is Physics a Sacred Cow?, L. D. Roper, The Southern Baptist Educator 30, No. 7, 7 (1966).
• Personalized Instruction with Bootstrap Tutors in an Introductory Biophysics Course, L. D. Roper, Amer. J. Phys. 42, 27 (1974).
• Pringle's Fly Wing Mechanism, F. T. McDuffee, L. D. Roper and R. W. Ross, Amer. J. Phys. 45, 303 (1977).
• PSI Quantum Mechanics with Optional Lectures on Videocassettes, L. D. Roper, R. A. Braden and J. T. Head, Amer. J. Phys. 45, 476 (1977).
• The Personalized System of Instruction, J. T. Head and L. D. Roper, Teaching and Learning, VPI&SU, Winter, 1977.
• Ph.D. Production Cycle, L. D. Roper, Physics Today 31, No. 12, 79 (1978).
• Videocassettes-the Ever-Ready Lecturer, L. D. Roper, Change Report on Teaching 5: 10, No. 1, 66 (January, 1978). (Also in Guide to Effective Teaching, p. 118, Change Magazine Press, N.Y., 1978.)
• Elementary particle Resonances from a Semiclassical Perspective, R. A. Arndt and L. D. Roper, Amer. J. Phys. 51, 418 (1983).
• Classical Scattering Patterns of a Central Potential, R. A. Arndt and L. D. Roper, Amer. J. Phys. 54, 614-618 (1986).
• PC Software Adds Color to Physics Lectures, R. A. Arndt and L. D. Roper, Computers in Phys. 2, 62-66 (1988).
• Physics Simulations for High-Resolution Color Microcomputers, R. A. Arndt and L. D. Roper, The Conference on Computers in Physics Instruction Proceedings, Edward F. Redish and John S. Risley, Editors, Addison-Wesley Pub. Co., Reading, MA, pp. 100-108, 1990. (See pp. 100-107 for this article.)
• Using Computers for Departmental Management and Faculty Development, L. D. Roper, Ninth Annual Conference Academic Chairpersons: Celebrating Success, Vol. 39, National Issues in Higher Education, Kansas State Univ., Manhattan, KS, pp. 170-179, 1992. (This article is discussed in Impact of projected future trends and issues on the role of department heads in Canadian community colleges.)
• Departmental Management with Computers, L. D. Roper, The Departmental Chair, 3, #3, pp. 8-11,Winter 1993. (This article is discussed in Impact of projected future trends and issues on the role of department heads in Canadian community colleges.)

CITATIONS (GOOGLE SCHOLAR)

• "Phys. Rev. Letters 12, 340 (1964)" Roper: 366
• "Roper resonance" OR "Roper puzzle" OR "Roper Phenomenology" OR "Roper channel" OR "Roper regime" OR "Roper mass OR "Roper excitation ": 3,760
• ("L. D. Roper" OR "L. David Roper") nucleon: 2,040
• ("L. D. Roper" OR "L. David Roper") pion: 1,710
• ("L. D. Roper" OR "L. David Roper") kaon: 332
• ("L. D. Roper" OR "L. David Roper") alpha: 514
• "Scattering Analyses Interactive Dial-in" OR "Scattering Analyses Interactive Dialin": 58
• "Analyses of Elastic Proton-Alpha Scattering" Roper: 63
• "Phys. Rev. D46, 961-969 (1992)" Roper: 206
• "Bull. Math. Biophys. 34, 151 (1972)" Roper: 10
• Electrodiffusion Roper: 135