LiF, Mg and Ti cubical TLD chips (known as TLD-100) are widely used for dosimetry purposes. The repeatability of TL dosimetry is investigated by exposing them to doses of (81, 162 and 40.5 mGy) with 662keV photons of Cs-137. A group of 40 cubical TLD chips was randomly selected from a batch and the values of Element Correction Coefficient (ECC) were obtained 4 times by irradiating them to doses...

Q: How long w i l l i t be before this rou nd o f dow nsiz ing is completed? A: What you arc seeing now is the be g inn ing 'o f the second wave o f downsizing, w h ich really was formalized by the revo lt in Iran. We already had started on the downsiz­ ing. The j cars had already been en­ gineered. We increased the capacity o f those cars — we changed all the plans at that point. W e'll start ...

The chemical and mechanical properties of extracellular matrices (ECMs) modulate diverse aspects of cellular fates; however, how regional heterogeneity in ECM composition regulates developmental programs is not well understood. We discovered that fibronectin 1 (Fn1) is expressed in strikingly non-uniform patterns during mouse development, suggesting that regionalized synthesis of the ECM plays ...

Family Planning Perspectives riculum of its kind. It is brief and takes up little class time and, given its focus on postponing sex, has broad appeal to parents and schools. Moreover, an Atlanta-based evaluation of the PSI program implemented in combination with a five-session human sexuality course suggested that the curriculum delayed the initiation of first intercourse.2 However, serious que...

Here I indulge in wide-ranging speculations on the shape of physics, and technology closely related to physics, over the next one hundred years. Themes include the many faces of unification, the re-imagining of quantum theory, and new forms of engineering on small, intermediate, and large scales. When Leon Cooper, on behalf of Brown University, asked me to contribute to their 250th anniversary ...

Recently, Van Noorden, Maher, and Nuzzo (2014) published a list of papers which are among the 100 most highly cited papers of all time. This letter argues that such a list should not be produced on the base of bare citation counts, but normalized bibliometric indicators – the standard in bibliometrics.

95 THE CANADIAN HIGHWAY NETwork consists mainly of two-lane highways where passing slower cars requires traveling in the lane assigned to the opposite traffic. Therefore, studying the mechanism of the passing maneuver is important for maintaining traffic safety, as well enhancing the highway’s level of service. Models for passing maneuvers are available in the design guides1,2 while different v...

Accurate parallaxes from the Hipparcos catalog have enabled detailed studies of stellar properties. Subgiants are of particular interest because they lie in an area where isochrones are well separated, enabling dependable age determination. We have initiated a project to obtain hires spectra of Hipparcos subgiants in a volume-limited sample within 100 pc. We obtain stellar properties and abunda...

THIS IS A STORY about a town that grew into a city, a Board of Guardians, and a hospital that was not wanted, certainly not to begin with by the Poor Law Commissioners in Dublin, who protested most strongly that they did not want their Workhouse to become a hospital. It all began in 1838, one hundred and thirty five years ago, when an Act of Parliament The Irish Poor Law Relief Act was passed t...