In this paper, validation of a model for the speed dependency of friction is presented. Based on the shape of the friction – speed curve, the model assumes that calculation of friction at any speed would need an estimate of friction at very low speed, and the knowledge of its variation with speed described by the Stribeck curve. Two existing models developed at LCPC are then coupled to predict ...

The effect of compressional force on the crystallinity of low crystallinity cellulose (LCPC), microcrystalline celluloses (Avicel PH-101, PH-102 and PH-302 grades) and powdered cellulose (Solka Floc BW-100) has been investigated using an X-ray diffraction method. Microcrystalline and powdered celluloses showed an increase of about 10% in their crystallinities, compared to the values for the cor...

The geological context of this study is established in the iron oxide-copper-gold (IOCG) deposit Sossego (Canaã dos Carajás, Brazil), where hydrothermal alterations shear zones concentrated metals interest and added new characteristics to metavolcanic-sedimentary granite rocks. mineral transformation rocks by hypersaline fluids enriched silica also modifies some metallurgical properties, such a...

Rock abrasivity, as one of the most important parameters affecting the rock drillability, significantly influences the drilling rate in mines. Therefore, rock abrasivity should be carefully evaluated prior to selecting and employing drilling machines. Since the tests for a rock abrasivity assessment require sophisticated laboratory equipment, empirical models can be used to predict rock a...

Records for pigs included in an experiment on reciprocal recurrent selection conducted from 1956 through 1971 at the USDA Beltsville Agriculture Research Center were analyzed to obtain estimates of heritabilities and genetic correlations and to derive prediction equations for estimating weight of lean cuts (WTLC) and percentage of lean cuts of shrunk slaughter weight (LCPC). Lean cuts growth ra...

This work demonstrates a tunable liquid crystal polarization converter (LCPC) constructed using two conductive glass substrates that are treated with homogeneous alignment and azimuthal alignment, respectively. The surface is deeply rubbed to enhance the performance tilted LC molecules compared surface. layer initially presents twisted-azimuthal texture, which capable of converting linear (radi...

TRB 90th Annual Meeting 2011 VISIBILITY MONITORING USING CONVENTIONAL ROADSIDE CAMERAS: 1 SHEDDING LIGHT ON AND SOLVING A MULTI-NATIONAL ROAD SAFETY 2 PROBLEM 3 4 By 5 6 Raouf Babari 7 Université Paris-Est, LEPSIS, INRETS-LCPC 8 58 boulevard Lefebvre, 75015 Paris, France 9 Voice: +33 1 40 43 51 78 10 Fax: +33 1 40 43 54 99 11 [email protected] 12 13 Nicolas Hautière 14 Université Paris-Est, ...

In anticipation of the introduction of high modulus materials in the Swiss standards, a research project has been carried out for the evaluation of these bituminous mixtures. These mixtures make possible to reduce rut in base courses. With a temperature of 50°C, three test sections (two with high modulus and one with a reference material for base layer), were built in a building for ALT and wer...

This paper presents several localisation algorithms based on the Extended Kalman Filter approach and compares their respective performances . The main interest lies in the proposal of two different instrumentations able to replace odometry, unusable on work sites. Results are presented using data obtained on trials carried out at the Centre d'Experimentations Routieres ( CER) in Rouen in collab...