German Source Materials in American Libraries

https://epublications.marquette.edu/mupress-book/1003/thumbnail.jp

Electronic charge density in helium in the first order shielding approximation

Electronic charge density for ground state of helium as function of nuclear charg

Some Remarks on the Use of the Variational Principle for the Second Order Energy

Approximate ground state wave function used in variational principle for second order energ

Variational method 3 - Steady state time dependent perturbation theory

Steady state time dependent perturbation theory and variational principle

The variational method 2 - Perturbation theory

Variational method to approximate solutions of perturbation equations, perturbation analyses, and use of perturbation theory to infer variational principl

Redressing the Rural-Urban Imbalance

This paper focuses on rural poverty, its causes and effects, and suggests one of a number of possible measures to alleviate the problem. It examines why there exists an urban bias in development, and the impact it has on development patterns. The macroimplications derived from intensive longitudinal micro-studies of two South Indian villages are also examined. These studies throw into relief the key role income-generating opportunities play in rural societies. They show how the existence of such opportunities ensures the reduction of rural poverty and removes, or at least reduces, the need for ruralurban migration; whereas their absence has the reverse effect. As the growing rural population accompanied by increasing water shortages reduce the possibilities of continuing increases in agricultural productivity, there is an urgent need to urbanise rural life and to make it more attractive in terms of economy and infrastructure. Finally, an outline of a Three-Level Rural-Urban Business Linkages paradigm, which though putting emphasis on increased agricultural productivity, stresses the growing importance of establishing agro-based industries and the creation of other off-farm activities. It is presented as one option that may be pursued to redress the rural-urban imbalance and thereby reduce rural poverty. The paradigm involves a decentralisation of small goods productive processes in a setting of Growth Areas and Growth Centres that are linked with the nearest large towns and/or cities. As long as the political will exists and the necessary preconditions are met, the implementation of this paradigm constitutes a good chance of improving conditions in both rural and urban areas.

Variational methods and degenerate perturbation theory

Variational methods and degenerate perturbation theor

Theorems satisfied by variational wave functions in scattering theory

Various theorems in the theory of spinless particle scattering by a real central potential are derived directly from the Kohn variational principle

Sum rules for variational wave functions

Sum rules for variational wave function

Two notes on perturbation theory. 1 - Interchange theorems and the variation principle. 2 - PV in a different notation

Interchange theorems and variational principle in perturbation theor