Radon Daughter Activity Size Distributions

Radon daughter exposure and lung cancer.

Mobility spectra of radon daughter aerosols stored in a vessel.

The time variation in the mobility spectrum of radioactive charged particles , stored in a closed vessel, and the concentration ratio of positive to negative particles were studied by using a mobility spectrometer of parallel plates type. A remarkable variation in the mobility spectrum with the mobility ranging from 3 •~ 10-2 cm2/V•Esec. to 3 •~ 10-4 cm2/V•Esec. was observed during four hours. ...

The Radon Transform on Distributions

In the literature there are three apparently different definitions of the Radon transform on various spaces of distributions: Gelfand-Graev’s, Helgason’s and Ludwig’s. In this paper a new definition of the Radon transform on the space of the tempered distributions is given and it is proved that, properly understood, the earlier definitions are all equivalent to the new one. A constructive descr...

Born Equal: Dual Safeguards for Daughter Cell Size Symmetry

Development and homeostasis require repeated symmetric cell divisions, which in turn depend on a centered mitotic spindle. In this issue, Kiyomitsu and Cheeseman uncover two mechanisms that ensure correct spindle positioning in anaphase: cortical dynein for pulling the spindle to the cell center and asymmetric membrane elongation that adjusts the position of the cell center to the cleavage plane.

CMAQ aerosol size distributions

Evaluation of the Community Multiscale Air Quality (CMAQ) model v5.0 against size-resolved measurements of inorganic particle composition across sites in North America C. G. Nolte, K. W. Appel, J. T. Kelly, P. V. Bhave, K. M. Fahey, J. L. Collett Jr., L. Zhang, and J. O. Young Atmospheric Modeling and Analysis Division, National Exposure Research Laboratory, Office of Research and Development, ...