Polyolefin fiber-reinforced concrete enhanced with steel-hooked fibers in low proportions

Over the past few years, polyolefin fiber reinforced self-compacting concrete has shown high performance in both fresh and hardened state. Its fracture behavior for small deformations could be enhanced with a small amount of steel-hooked fibers, obtaining a hybrid fiber-reinforced concrete well suited for structural use. Four types of conventional fiber-reinforced concrete with steel and polyolefin fibers were produced on the basis of the same self-compacting concrete also manufactured as reference. These concrete mixtures were manufactured separately with the same fiber contents being subsequently used for two more hybrid mixtures. Fracture properties, in addition to fresh and mechanical properties, were assessed. The research showed both synergies (with the two types of fibers working together in the fracture processes) and an improvement of the orientation and distribution of the fibers on the fracture surface

Sex proportions of Haemoproteus blood parasites and local mate competition.

Recent genetic evidence suggests that parasitic protozoa often reproduce by "selfing," defined as sexual stages from a single, clonal lineage fertilizing each other. Selfing favors production of an excess of female over male progeny. We tested whether the proportion of male gametocytes of blood parasites of the genus Haemoproteus was affected by variables that could influence the probability of selfing. Proportions of male Haemoproteus gametocytes from 11 passerine host populations were not affected by the age of the parasites' avian hosts, date in season, sex of host, intensity of host's infection, or prevalence of parasites within host populations.

COCHRAN: Stata module to test for equality of proportions in matched samples (Cochran's Q)

-cochran- performs a test for equality of two or more proportions in matched samples. The chi-squared calculated by -cochran- is known as Cochran's Q (Cochran 1950)

Les proportions du corps humain = De proportien van het menschlyk ligchaam /

Signatures: A-B⁴. (B4v blank)

Des proportions géométrales et des à plombs des membres du taureau : seconde lettre à M. Bachelier... /

Mode of access: Internet.

Explication des proportions géométrales du cheval : vu dans ses trois principaux aspects, suivant les principes établis dans les Ecoles Royales Vétérinaires.

Grab. xil. "Vicente Lopez Enguidanos, lo grabó"

Dictionnaire de Marine : contenant les termes de la navigation et de l'architecture navale avec les régles [et] proportions qui doivent y être observées : ouvrage enrichi de figures.

Mode of access: Internet.