Green function techniques in the treatment of quantum transport at the molecular scale

The theoretical investigation of charge (and spin) transport at nanometer length scales requires the use of advanced and powerful techniques able to deal with the dynamical properties of the relevant physical systems, to explicitly include out-of-equilibrium situations typical for electrical/heat transport as well as to take into account interaction effects in a systematic way. Equilibrium Green function techniques and their extension to non-equilibrium situations via the Keldysh formalism build one of the pillars of current state-of-the-art approaches to quantum transport which have been implemented in both model Hamiltonian formulations and first-principle methodologies. We offer a tutorial overview of the applications of Green functions to deal with some fundamental aspects of charge transport at the nanoscale, mainly focusing on applications to model Hamiltonian formulations.Comment: Tutorial review, LaTeX, 129 pages, 41 figures, 300 references, submitted to Springer series "Lecture Notes in Physics

Observational studies of staff working with mentally retarded persons: a review.

Experimental or quasi-experimental studies of the behavior of staff working with retarded persons were reviewed and provided the following generalizations: (a) staff often have very low rates of interactions with clients, (b) a disproportionate number of interactions occur with a relatively small number of clients, (c) structured settings promote more interactions, (d) small teaching groups promote interactions, (e) staff involvement in relevant decisions promotes interactions, (f) larger, more global, and ecological assessments of both staff and clients provide important information on the effects of staff management and training, (g) lowering the reading difficulty of training materials increases staff comprehension, (h) lectures tend to improve academic skills while practicum training improves teaching skills, (i) some trained skills generalize while others do not, apparently unsystematically, (j) a system in which supervisors rather than researchers external to the facility do the training is feasible, (k) various low cost systems of public or private feedback can increase staff participation in their duties, (l) implementation of strict administrative policies can reduce tardiness and absenteeism, and (m) staff may be very reactive to announced observation by inspection agencies

Observational studies of staff working with mentally retarded persons: a review.

Experimental or quasi-experimental studies of the behavior of staff working with retarded persons were reviewed and provided the following generalizations: (a) staff often have very low rates of interactions with clients, (b) a disproportionate number of interactions occur with a relatively small number of clients, (c) structured settings promote more interactions, (d) small teaching groups promote interactions, (e) staff involvement in relevant decisions promotes interactions, (f) larger, more global, and ecological assessments of both staff and clients provide important information on the effects of staff management and training, (g) lowering the reading difficulty of training materials increases staff comprehension, (h) lectures tend to improve academic skills while practicum training improves teaching skills, (i) some trained skills generalize while others do not, apparently unsystematically, (j) a system in which supervisors rather than researchers external to the facility do the training is feasible, (k) various low cost systems of public or private feedback can increase staff participation in their duties, (l) implementation of strict administrative policies can reduce tardiness and absenteeism, and (m) staff may be very reactive to announced observation by inspection agencies

A Computer-Based System for Collecting and Analyzing Observational Data

This article describes a system based on the Epson HX-20 used for real time (rather than time-sample) recording of behavior observation data, which allows the researcher additional options in analysis. Examples of the programs developed, types of research questions asked, and data analyses conducted are provided

A Computer-Based System for Collecting and Analyzing Observational Data

This article describes a system based on the Epson HX-20 used for real time (rather than time-sample) recording of behavior observation data, which allows the researcher additional options in analysis. Examples of the programs developed, types of research questions asked, and data analyses conducted are provided