This paper is a study of the behavioral and spatial firing correlates of neurons in the rat postsubiculum. Recordings were made from postsubicular neurons as rats moved freely throughout a cylindrical chamber, where the major cue for orientation was a white card taped to the inside wall. An automatic video/computer system monitored cell discharge while simultaneously tracking the position of 2 ...

A methodology is presented for determining the probability of dikes failing due to uplifting and piping using directional sampling. The study concerns one dike section in the lower river area of The Netherlands. For this dike section, the three most important random quantities are: the North-Sea water level, the river Rhine discharge, and the critical head in the event of uplifting and piping. ...

Data from the National Hospital Discharge Survey were reviewed to assess trends in hospital discharge rates for cerebrovascular disease in the United States between 1970 and 1983. Hospital discharge rates showed little consistent change during the 1970's but increased after 1979. Hospital case fatality declined during the same period. Cerebrovascular disease discharge rates were higher among ol...

This article reviews the progress in the development of practical table-top sources of soft x-ray laser radiation. The field is rapidly approaching the stage at which soft x-ray lasers sufficiently compact to fit onto a normal optical table will be routinely utilized in science and technology. This is the result of recent advances in the amplification of soft x-ray radiation in both compact las...

One important behavioral role for head movements is to assist in the redirection of gaze. However, primates also frequently make head movements that do not involve changes in the line of sight. Virtually nothing is known about the neural basis of these head-only movements. In the present study, single unit extracellular activity was recorded from the superior colliculus while monkeys performed ...

OBJECTIVE To perform a retrospective radiographic assessment of the reduction and implant position in the femoral head in patients with pertrochanteric fractures treated with cephalomedullary nailing in the lateral position versus traction table. METHODS Radiographs of patients with pertrochanteric fracture of the femur treated with cephalomedullary nailing in the lateral position and tractio...

Oscillatory well pumping was proposed recently as a tool for hydraulic tomography. Periodic pumping at a few frequencies is carried out through vertical intervals along the pumping well and the periodic head is measured along a few piezometers. The paper presents an analytical solution for the head field in an unconfined aquifer of finite depth under the common assumptions of a linearized water...

[1] This paper investigated the interaction of groundwater and seawater in a tidally influenced gravel beach. Field observations of water table, pore water salinity were performed. The two‐dimensional finite element model MARUN was used to simulate observed water table and salinity. Based on field observations and model calibrations, a two‐layered beach structure was identified which is charact...

OBJECTIVE The aim of this study was to determine how head and neck postures vary when using two media tablet (slate) computers in four common user configurations. METHODS Fifteen experienced media tablet users completed a set of simulated tasks with two media tablets in four typical user configurations. The four configurations were: on the lap and held with the user's hands, on the lap and in...