Effective Thermal Conductivity Estimates Of Particulate Mixtures

Several theories have been advanced to estimate effective thermal conductivities of particulate mixtures, but most theories have focused on the dilute case. A method is proposed to estimate the effective thermal conductivity coefficient of mixtures of arbitrary concentration. Earlier the authors developed a theory to determine the expected contact area between different species. This theory is employed to determine the Kapitza resistance of the heterogeneous mixture and forms part of an overall theory to estimate the effective thermal conductivity. Results are compared with other theoretical estimates and with experiments.

Underneath the cerclage: an ex vivo study on the cerclage-bone interface mechanics

Cerclages regain interest due to a rising number of periprosthetic fractures. The contact distribution at the circumferential cerclage-bone interface is still unknown. Local interface pressure depends on the amount of contact area. Cortical damage at the interface would provoke cerclage loosening. Therefore, the contact area, the bone pressure along the interface and the cortical resistance underneath loaded cerclages were determined in an ex vivo model.

Role for cells in the presupplementary motor area in updating motor plans.

Two motor areas are known to exist in the medial frontal lobe of the cerebral cortex of primates, the supplementary motor area (SMA) and the presupplementary motor area (pre-SMA). We report here on an aspect of cellular activity that characterizes the pre-SMA. Monkeys were trained to perform three different movements sequentially in a temporal order. The correct order was planned on the basis of visual information before its execution. A group of pre-SMA cells (n = 64, 25%) were active during a process when monkeys were required to discard a current motor plan and develop a plan appropriate for the next orderly movements. Such activity was not common in the SMA and not found in the primary motor cortex. Our data suggest a role of pre-SMA cells in updating motor plans for subsequent temporally ordered movements.

Tentative pavement and geometric design criteria for minimizing hydroplaning. Phase I. Final report.

Federal Highway Administration, Office of Research and Development, Washington, D.C.

Using an outflow meter to predict braking traction speed gradients as a function of surface tension. Technical report.

Mode of access: Internet.

Texturing of concrete pavements. Interim report no. 2.

Federal Highway Administration, Baton Rouge, La.

Measurement of hydroplaning potential. Final report.

Pennsylvania Department of Transportation, Bureau of Materials, Testing and Research, Harrisburg

Tire-pavement interface variability. Volume II - technical report. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Tire-pavement interface variability. Volume I - summary report. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Manual for the construction and maintenance of skid surfaces corresponding to those prepared by Texas Transportation Institute under National Bureau of Standards contract CST-451. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Improved skid resistant pavements. Demonstration project no. 10. Final report.

Mode of access: Internet.

Effectiveness of alternative skid reduction measures. Volume I: evaluation of accident rate-skid number relationships. Final report.

Federal Highway Administration, Office of Research and Development, Washington, D.C.

Effectiveness of alternative skid reduction measures. Volume II: benefit-cost model. Final report.

Federal Highway Administration, Office of Research and Development, Washington, D.C.

A strategy for reducing wet-pavement accidents in Illinois. Interim report.

Mode of access: Internet.

Accident rates and surface properties - an investigation of relationships. Final report.

Federal Highway Administration, Washington, D.C.