A new coupled-cavity design for single-longitudinal-mode operation of an optical parametric oscillator (OPO) is presented. The OPO is based on a beta-BaB(2)O(4) crystal and is pumped by the third harmonic of a Nd:YAG laser. With this design, we achieved single-longitudinal-mode operation of the OPO with a decrease in the threshold and an increase in external efficiency compared with those of a ...

During the final hours of pregnancy, uterine contractions cause the foetus to move through the birth canal and leave the mother's body. Haly Abbas (died 982-994 CE), is believed to be the first writer to explain the role of these contractions. However, this concept had in fact been described in the text titled Bab-e-Borzouyeh, written four centuries earlier by the physician Borzouyeh (Perzoes i...

Department of Internal Medicine (AMLL), & Dept. of Anesthesia (RM, GW), Addenbrooke’s Hospital, University of Cambridge, Cambridge, UK Dept. of Chemistry (CA, MF), University of Cambridge, Cambridge, UK SynGenix LTD, Cambridge, UK (AGF, GW, MB, MF) Museum of Comparative Zoology and Department of Anthropology, Harvard University, Cambridge, MA (AGF, TWD, MKR, AJS) Dept. of Neurosurgery, Atkinson...

October 2008 The Arabian Journal for Science and Engineering, Volume 33, Number 2B 453 AN APPROACH TO THE FUZZY VARIABLE STRUCTURE CONTROL OF INDUCTION MOTORS L. Barazane * University of Science and Technology Houari. Boumediene (USTHB) Faculty of Electronic & Computing BP 32, El-Alia, Bab-Ezzouar 16111, Alger, Algérie M. M. Krishan ** Al-Balq'a Applied University Engineering of Information and...

There has recently been a revolution in our understanding of how the Drosophila sex-determination hierarchy generates somatic sexual dimorphism. Most significantly, the sex hierarchy has been shown to modulate the activities of well-known signaling molecules (FGF, Wnt and TGF beta proteins) and transcription factors (BAB and DAC) to direct various sex-specific aspects of growth and differentiat...

Let θ(a1, a2, · · · , ak) denote the graph obtained by connecting two distinct vertices with k independent paths of lengths a1, a2, · · · , ak respectively. Assume that 2 ≤ a1 ≤ a2 ≤ · · · ≤ ak. We prove that the graph θ(a1, a2, · · · , ak) is chromatically unique if ak < a1 + a2, and find examples showing that θ(a1, a2, · · · , ak) may not be chromatically unique if ak = a1 + a2.