Daguerreotypes by Hartley Webster

Micro XRF Imaging of Daguerreotypes

century. The process involved polishing a silver coated copper plate, made photo sensitive by exposure to halogens, then exposed to light, and finally coated with gold. This complex, intricate process has yielded some of the most iconic images of the 19 th century. Unfortunately, in some instances plate interaction with storage materials have yielded objects ranging from pristine to disfigured....

On the generalized Hartley and Hartley-Hilbert transformations

*Correspondence: [email protected] 2Department of Mathematics and Institute of Mathematical Research, Universiti Putra Malaysia (UPM), Serdang, Selangor 43400, Malaysia Full list of author information is available at the end of the article Abstract In this paper, we extend Hartley and Hartley-Hilbert transformations (HT and HHT, respectively) to a certain space of tempered distribution...

Webster, privacy, and RU486.

The Richard Webster Medal

There have recently been moves afoot among evolutionary biologists to stop speaking of ‘Darwin’s theory of evolution’ and, instead, to call it ‘Darwin’s law of evolution’. This is to stymie creationists who like to say ‘evolution is only a theory’. Now I am all in favour of stymieing creationists, but I think that this idea is misguided. The underlying assumption is that the use of the word ‘La...

Robert J . Webster III

As a flexible needle with a bevel tip is pushed through soft tissue, the asymmetry of the tip causes the needle to bend. We propose that, by using nonholonomic kinematics, control, and path planning, an appropriately designed needle can be steered through tissue to reach a specified 3D target. Such steering capability could enhance targeting accuracy and may improve outcomes for percutaneous th...