A systematic understanding of traffic dynamics on road networks is crucial for many transportation studies and can help to develop more efficient ramp metering, evacuation, signal control, and other management and control strategies. In this study, we present a theory of multi-commodity network traffic flow based on the Lighthill–Whitham–Richards (LWR) model. In particular, we attempt to analyz...

Maternal behaviour in golden hamsters has been the subject of several studies (ROWELL 1960, 1961 a, 1961 b; LOTT 1962; NOIROT & RICHARDS 1966; RICHARDS 1966 a, 1966 b). Most of these have investigated the response to the presentation of pups placed outside the nest by the experimenter, analysing the functional relations between test behaviour and such variables as reproductive stage, hormonal s...

The stability of steady, vertically upward and downward flow of water in a homogeneous layer of soil is analyzed. Three equivalent dimensionless forms of the Richards equation are introduced, namely the pressure head, saturation, and matric flux potential forms. To illustrate general results and derive special results, use is made of several representative classes of soils. For all classes of s...

OBJECTIVE To test Richards and Goodman's hypothesis that a higher proportion of only children under age 5 years assessed in a psychiatric department do not present a psychiatric diagnosis, compared with preschool children with 1 sibling, and to investigate other variables relative to children in this age group with no psychiatric disorder, in light of Richards and Goodman's findings. METHOD W...

Trance channeling and multiple personality disorder both seem to be predicated on the basic mental process of dissociation. Dissociation has been defined, very simply, as the opposite of association. Elements of the psyche may be in a dynamic relationship with each other, in which case thoughts, feelings, experiences, etc. are integrated into consciousness and memory (association). Or these sam...

A two-layer model for 1D vertical unsaturated flow based on the hypothesis of a sharp wetting front is presented. The model further assumes a uniform pore pressure throughout the wetting zone at any given time during the infiltration and redistribution processes. These assumptions allow to reduce the theoretical Richards equation to an ordinary differential equation that can track average soil ...