Guidelines for the Inclusion of Left-Turn Lanes at Rural Highway Intersections, HR-147, 1970

Provision of left turn lanes is a major problem which lacks an objective approach. Various techniques and procedures in use have been reviewed. Traffic characteristics at typical Iowa intersections have been measured. A rational approach for inclusion of a left turn lane has been developed, based on relating the benefits to the road user to the cost of providing the added turing lane. An analysis of field data gathered under this project indicates that the use of theoretical distribution to describe vehicle headways is not applicable to rural Iowa two lane roads. As an alternate approach the mass of field data gathered were examined using multiple regression techniques to yield equations for predicting stops and delays. The benefit-cost ratio technique is recommended as the criterion for decision making.

Granular Base Materials for Flexible Pavements, HR-131, 1970

The coefficients of relative strength (CORS) of base courses for use in the American association state highway officials (AASHO) interim guide for the design of flexible pavements are determined here. Based on (1) volumetric strain--axial strain relationships at minimum volume, and (2) effective stress ratio-cohesion relationships at maximum effective stress ratio, CORS were determined from the results of laboratory triaxial tests on both asphalt-treated and untreated aggregate base course materials. The researchers conclude that volumetric strain-axial strain at minimum volume appear to be appropriate parameters for determining CORS.

Preliminary Studies of Remedial Measures for the Prevention of Bridge Deck Deterioration, HR-146, 1970

Four series of five specimens each were investigated for static and fatigue strength. These four series differed in that there were two variables, the first being the subsidence of concrete around reinforcing bars and the second being shrinkage due to two different curing conditions. The combinations of these variables were then compared to each other by use of, load-deflection curves and S-H fatigue curves.

[8 lettres autographes signées de Jules Barbier à Henri Heugel, 1885]

13 avril : au sujet de ses droits d'auteur. - 13 mai : remerciements. - 12 juillet : L'informe s'être rendu chez lui pour procéder aux remises d'argent. Déclare être "à la veille de conclure une affaire qui [lui] permettra de faire honneur à tous ses engagements". - 17 juillet : Au sujet du "Timbre d'argent" qui ne trouve pas d'éditeur : "Je regrette pour Saint-Saëns et pour moi que ce pauvre "Timbre" ne soit pas entre les mains d'un croyant qui l'aurait certainement fait vibrer.". - 28 août : Lui adresse un article pour le "Ménestrel". - 15 septembre : Lui recommande une artiste du chant, Mademoiselle Maindron. - 12 novembre : "Je viens d'entendre le duo de Boussy chanté par Madame de Lanchâtre et sa fille. C'est tout simplement adorable". - 1er décembre : remerciements

Élie de Saint Gilles : chanson de geste / publ. avec introd. par Gaston Raynaud ; trad. par Eugène Koelbing

[Élie de Saint-Gilles (français ancien). 1879]

Élie de Saint Gilles : chanson de geste / publ. avec introd. par Gaston Raynaud ; trad. par Eugène Koelbing

[Élie de Saint-Gilles (français ancien). 1879]