Regional investment functions of material infrastructure: theoretical issues and selected empirical case studies

In this paper a survey is given of the theoretical contributions essential for the derivation of regional investment functions of material infrastructure. A basic distinction is made between models of investment volume (level models) and investment-programming models (structure models). Investment functions may also be obtained from structure models by parametric programming that may be subsumed under those types of functions stemming from level models. In addition, empirical research on investment functions in selected fields of regional water-quality management, electricity supply, and provision of telephone services is summarized with respect to the main theoretical approaches -- the accelerator models and the neoclassical cost model. To a substantial extent this research uses unpublished data for regression analysis.

Existence of strictly diabatic basis sets for the two-state problem

Some new properties of the nonadiabatic coupling elements are derived, in particular the orthogonality and gauge invariance of their longitudinal and transverse components. A method for constructing a strictly diabatic basis set that makes both the transverse and longitudinal components of the nonadiabatic coupling elements of the two-state problem vanish identically and is based on introducing overlap between the electronic states in the vicinity of the crossing seam is proposed. © 2002 Wiley Periodicals, Inc. Int J Quantum Chem, 200