Fourier series for eclipses on exoplanet binaries

A double planet system or planet binary undergoes eclipses that modify the reflective light curve. In the time domain, the eclipse events are fast and weak. This would make their signal difficult to find and recognize in the phase light curve, even for small inclinations when eclipses happen frequently. However, due to the quasiperiodic nature of the phenomenon, the Fourier transform of the direct reflection signal consists of a double sum of sharp peaks. These peaks can be resolved for large close binaries and sufficiently long observation times with a star coronagraph. Eclipses modulate the phase curve, having an orbital period $2\pi/\omega$, with a contribution from the relative motion in the binary plane of a period $2\pi/\Omega$. This leads to a spectral structure with basis frequencies $\omega$ and $\Omega$. We aim to characterize these spectra. We studied the regime of short eclipses that occur when the planet radii are small compared to the planet separation. We derived formulas for the peak amplitudes applicable to homogeneous (Lambertian) planet binaries in circular orbit with small inclination. The effects of an eclipse and of double reflection appear as first- and second-order contributions (in planet radius over separation) in the reflection signal respectively. Small peaks appear as observable side bands in the spectrum. Identical structures around $m\Omega$ are characteristic of short-duration eclipses. Deceasing side bands could indicate double reflection between companions. Fourier analysis of the light curve of non-transiting planets can be used to find planets and their moons. Difficulties in interpreting the structures arise for small planet separation and when there are several moons in mean-motion resonance.Comment: 12 pages, 10 figure

Balanced ternary addition using a gated silicon nanowire

We demonstrate the proof of principle for a ternary adder using silicon metal-on-insulator single electron transistors (SET). Gate dependent rectifying behavior of a single electron transistor results in a robust three-valued output as a function of the potential of the SET island. Mapping logical, ternary inputs to the three gates controlling the potential of the SET island allows us to perform complex, inherently ternary operations, on a single transistor

On difference and doubt as tools for critical engagement with public health

This paper argues that critical public health should reengage with public health as practice by drawing on versions of Science and Technology Studies (STS) that ‘de-centre the human’ and by seeking alternative forms of critique to work inspired by Foucault. Based on close reading of work by Annemarie Mol, John Law, Vicky Singleton and others, I demonstrate that these authors pursue a conversation with Foucault but suggest new approaches to studying contemporary public health work in different settings. Proposing that we ‘doubt’ both the unity of public health and its effects, I argue that this version of STS opens up a space to recognise multiplicity; to avoid idealising what is being criticised; and to celebrate or care for public health practices as part of critique. Finally I oppose the view that considering technologies, materials and microbes leads to micro-level analysis or political neutrality, and suggest that it allows us to reframe studies of public health to account for inequalities and to draw attention to weak or retreating states, active markets and the entangled relations of humans and non-humans across the world

Interface-induced heavy-hole/light-hole splitting of acceptors in silicon

The energy spectrum of spin-orbit coupled states of individual sub-surface boron acceptor dopants in silicon have been investigated using scanning tunneling spectroscopy (STS) at cryogenic temperatures. The spatially resolved tunnel spectra show two resonances which we ascribe to the heavy- and light-hole Kramers doublets. This type of broken degeneracy has recently been argued to be advantageous for the lifetime of acceptor-based qubits [Phys. Rev. B 88 064308 (2013)]. The depth dependent energy splitting between the heavy- and light-hole Kramers doublets is consistent with tight binding calculations, and is in excess of 1 meV for all acceptors within the experimentally accessible depth range (< 2 nm from the surface). These results will aid the development of tunable acceptor-based qubits in silicon with long coherence times and the possibility for electrical manipulation

Cost-effectiveness of ovarian stimulation agents for IUI in couples with unexplained subfertility

Acknowledgements The authors wish to thank M.P. Diamond, R.S. Legro, K. Peeraer, M. Erdem, T. Dankert, and R. Ecochard, on behalf of the IUI IPDMA collaboration, for providing data from their RCTs for the IPDMA of which the results are used in a sensitivity analysis. Funding This work was supported by ZonMw Doelmatigheidsonderzoek, grant 80-85200-98-91072. The funder had no role in the design, conduct or reporting of this work. B.W.M. is supported by a NHMRC Practitioner Fellowship (GNT1082548).Peer reviewedPublisher PD

Toric intraocular lenses for correction of astigmatism in keratoconus and after corneal surgery

Purpose: To describe the results of cataract extraction with toric intraocular lens (IOL) implantation in patients with preexisting astigmatism from three corneal conditions (keratoconus, postkeratoplasty, and postpterygium surgery). Methods: Cataract patients with topographically stable, fairly regular (although sometimes very high) corneal astigmatism underwent phacoemulsification with implantation of a toric IOL (Zeiss AT TORBI 709, Alcon Acrysof IQ toric SN6AT, AMO Tecnis ZCT). Postoperative astigmatism and refractive outcomes, as well as visual acuities, vector reduction, and complications were recorded for all eyes. Results: This study evaluated 17 eyes of 16 patients with a mean age of 60 years at the time of surgery. Mean follow-up in this study was 12 months. The corrected distance Snellen visual acuity (with spectacles or contact lenses) 12 months postoperatively was 20/32 or better in 82% of eyes. The mean corneal astigmatism was 6.7 diopters (D) preoperatively, and 1.5 D of refractive cylinder at 1-year follow-up. No vision-compromising intra- or postoperative complications occurred and decentration or off-axis alignment of toric IOLs were not observed. Conclusion: Phacoemulsification with toric IOL implantation was a safe and effective procedure in the three mentioned corneal conditions. Patient selection, counseling, and IOL placement with optimal astigmatism correction are crucial

Aspersor de garrafa PET com conexão de 3/4 de polegada.

O sistema apresentado é uma adaptação do sistema demonstrado pela Emater Paraná na Vitrine Tecnológica de Agroecologia do Show Rural Coopavel 2014, entre os dias 03 e 07 de fevereiro de 2014. O sistema utilizava Alberto Feiden conexões de irrigação por gotejamento para acoplar garrafas de refrigerante de Polite- reftalato de etileno (PET) perfuradas como aspersores encaixadas em mangueiras de polietileno pretas.bitstream/item/139088/1/Aspersor.pd