Robert J. Havighurst

(noun)

Robert James Havighurst (June 5, 1900 in De Pere, Wisconsin – January 31, 1991 in Richmond, Indiana) was a professor, physicist, educator, and aging expert.

Related Terms

Examples of Robert J. Havighurst in the following topics:

  • Activity Theory

    • The theory was developed by gerontologist, or, scholar of aging, Robert J.
    • Havighurst in 1961, and was originally conceived as a response to the recently published disengagement theory of aging.
    • Havighurst's activity theory is at deliberate odds with what some perceive as the pessimism of disengagement theory.

  • References

    • Brown, J.
    • Bruner, J.
    • M., & Tudge, J.
    • McNeil, J.
    • Knowing, learning, and instruction: Essays in honor of Robert Glaser.

  • References

    • Audi, Robert.
    • Boorstin, Daniel J.
    • Burke, James and Robert Ornstein.
    • Bynum, W.F., E.J.
    • Fisher, Robert.

  • The "adjacency" matrix

    • If Bob and Carol are "friends" they share a "bonded tie" and the entry in the Xi,j cell will be the same as the entry in the Xj,i cell.
    • In this case, the element showing Bob's relationship to Carol would be scored "1," while the element showing Carol's relation to Bob would be scored "0. " That is, in an "asymmetric" matrix, Xi,j is not necessarily equal to Xj,i.
    • That is, the element i,j does not necessarily equal the element j,i.
    • If the ties that we were representing in our matrix were "bonded-ties" (for example, ties representing the relation "is a business partner of" or "co-occurrence or co-presence," (e.g. where ties represent a relation like: "serves on the same board of directors as") the matrix would necessarily be symmetric; that is element i,j would be equal to element j,i.
    • In representing social network data as matrices, the question always arises: what do I do with the elements of the matrix where i = j?

  • Maintaining Control

    • Robert J.

  • Summary

    • An adjacency matrix is a square actor-by-actor (i=j) matrix where the presence of pair wise ties are recorded as elements.

  • What is a matrix?

    • A "3 by 6" matrix has three rows and six columns; an "I by j" matrix has I rows and j columns.

  • Bibliography

    • Barnes, J.A. 1983.
    • Blau, Peter and Robert K.
    • Brym, Robert J. 1988.
    • Davis, J. 1963.
    • Leik, Robert K. and B.F.

  • Millikan's Oil Drop Experiment

    • In 1909, Robert Millikan and Harvey Fletcher conducted the oil drop experiment to determine the charge of an electron.
    • Experimenting with cathode rays in 1897, J.
    • J.
    • Robert Millikan and Harvey Fletcher used the oil drop experiment.

  • Specific Heat for an Ideal Gas at Constant Pressure and Volume

    • The heat capacity at constant volume of nR = 1 J·K−1 of any gas, including an ideal gas is:
    • The heat capacity at constant pressure of 1 J·K−1 ideal gas is:
    • Julius Robert von Mayer (November 25, 1814 – March 20, 1878), a German physician and physicist, was one of the founders of thermodynamics.