Hydrogen ions

Hydrogen ion production and distribution in upper atmospher

Spruce Budworm Weight and Fecundity: Means, Frequency Distributions, and Correlations for Two Populations (Lepidoptera: Tortricidae)

Pupal weights and fecundities of spruce budworm from Minnesota had different means, coefficients of variation, and frequency distributions than spruce budworm from New Hampshire. The two variables were correlated in one of the populations but not the other

The Orientation of Unsymmetrical Molecules at Interfaces

A function giving the distribution of the angles of orientation of the molecular axes from the normal to the interface can be obtained if one makes use of a number of special assumptions regarding the forces of orientation. This is compared with the distribution calculated on assuming an extreme form of Langmuir's principle of independent surface action. The importance of having such a function is pointed out

Reproductive Compatibility Within and Among Spruce Budworm (Lepidoptera: Tortricidae) Populations

Spruce bud worm moths collected as larvae from two species of host trees in four populations were mated in single pairs in two years. In 1980 but not 1981, more of the intra-population matings than the inter-population matings were fertile. Host tree origin was not a significant factor in the level of sterility

Relaxing a large cosmological constant in the astrophysical domain

We study the problem of relaxing a large cosmological constant in the astrophysical domain through a dynamical mechanism based on a modified action of gravity previously considered by us at the cosmological level. We solve the model in the Schwarzschild-de Sitter metric for large and small astrophysical scales, and address its physical interpretation by separately studying the Jordan's frame and Einstein's frame formulations of it. In particular, we determine the extremely weak strength of fifth forces in our model and show that they are virtually unobservable. Finally, we estimate the influence that the relaxation mechanism may have on pulling apart the values of the two gravitational potentials Psi and Phi of the metric, as this implies a departure of the model from General Relativity and could eventually provide an observational test of the new framework at large astrophysical scales, e.g. through gravitational lensing.Comment: 14 pages, 3 figures, accepted in Mod. Phys. Lett. A, extended discussion, references adde