We present a brief introduction to the orbital angular momentum of light, the subject of our theme issue and, in particular, to the developments in the 13 years following the founding paper by Allen et al. (Allen et al. 1992 Phys. Rev. A 45, 8185 (doi:10.1103/PhysRevA.45.8185)). The papers by our invited authors serve to bring the field up to date and suggest where developments may take us next...

Grain diameter (mm) Wavelength (m) Mean n Mean Range n Reference 0.67 34 5.5 5 5.8 8 This study: Nuccaleena, Enorama Creek 0.87 31 2.6 1.8 3.2 7 This study: Nuccalenna, Elatina Creek 0.91 41 4.5 3 6 ? Halverson et al., 2004 Fig. 10b 0.43 3 0.6 ? ? de Alvarenga et al., 2004 Fig. 7b 1.28 25 2.5 2 3 ? Hoffman et al., 2007 Fig. 8b 1.86 8 1.5 1.2 1.8 ? Hoffman and Schrag, 2002 Fig. 4d 1.82 40 1.5 1....

A fast-growing theoretical literature on the political economy of reform has provided a sizable collection of models that have deepened our understanding concerning how distributional conflict manifests itself in the political process and can prevent efficiency-enhancing economic reform from taking place (see e.g., Allan Drazen [2000 Ch. 10, 13] for an insightful review). Unfortunately, systema...

9 Country Comparisons of Human Stroke Research Since 2001 A Bibliometric Study Kjell Asplund, MD; Marie Eriksson, PhD; Olle Persson, PhD (Stroke. 2012;43:830-837.)

Comparative Performance of Multi-view Stereoscopic and Mammographic Display Modalities for Breast Lesion Detection by Lincoln Jon Webb Medical Physics Graduate Program Duke University Date:_______________________ Approved: ___________________________ Ehsan Samei, Supervisor ___________________________ Joseph Lo ___________________________ Sua Yoo An abstract of a thesis submitted in partial ful...

substituted BiFeO3 epitaxial thin films at morphotropic phase boundaries Daisuke Kan, Ching-Jung Cheng, Valanoor Nagarajan, and Ichiro Takeuchi Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA Institute for Chemical Research, Kyoto University, Gokasyo Uji, Kyoto 611-0011, Japan School of Materials Science and Engineering, University of N...

genetic variability concealed in natural populations is the evolutionary Tg material of Mendelian populations. How the genetic variability increases through recombination is important in obtaining an understanding of the genetic structure of Drosophila populations. In fact, this problem has been studied in natural and artificial populations of several species of Drosophila (D. pseudoobscura: SP...

PURPOSE This study evaluates the extent to which bilingual children produce the same or overlapping responses on tasks assessing semantic skills in each of their languages and whether classification analysis based on monolingual or conceptual scoring can accurately classify the semantic development of typically developing (TD) bilingual children. METHOD In Study 1, 55 TD children (ages 4;0 [y...

O estudo de Trattinnickia burserifolia levou ao isolamento dos triterpenos conhecidos ursanos α-amirenona, α-amirina, 3-epi-α-amirina, 3α,16β-diidroxiurs-12-eno; oleananos β-amirenona, βamirina, 3-epi-β-amirina, 3α,16β-diidroxiolean-12-eno; tirucalanos ácidos 3α-hidroxitirucal-8,24dien-21-óico, 3α-hidroxitirucal-7,24-dien-21-óico, e 3-oxotirucal-8,24-dien-21-óico; damaranos dammarenediol-II e 3...