BACKGROUND Despite the use of a series of preventive measures, a high incidence of severe acute respiratory syndrome (SARS) was observed among health care workers (HCWs) during the SARS epidemic. This study aimed to determine which preventive measures may have been effective in protecting HCWs from infection, and which were not effective. METHODS A retrospective study was performed among 758 ...

Myung-Won You, Dong Kyun Lee, Jong-Min Lee, Sun-Mi Kim, Chang-Woo Ryu, Eui Jong Kim, Geon-Ho Jahng* Department of Radiology, Graduate School of Medicine, Kyung Hee University Computational NeuroImage Analysis Lab, Department of Biomedical Engineering, Hanyang University Department of Radiology, Kyung Hee University Hospital at Gangdong, School of Medicine, Kyung Hee University Department of Rad...

Examining a sample of 701 offshore securities offerings under Regulation S of the Securities Act from 1993 to 1997, this Article tests whether foreign investors expect to resell Regulation S securities in the United States ahead of the U.S. secondary market reaction to news of the offering. The Article provides evidence from an event study that the secondary market reaction to a Regulation S of...

A Digital Sun Sensor (DSS) has several advantages if compared to the analogue one. It achieves higher accuracy and avoids the problems with light being reflected from the Earth’s surface. The gradual degradation of the sensitivity of the elements due to radiation effects is not crucial for its proper functioning. The advances in CCD and recently in CMOS technology make possible to implement the...

Spectroscopic measurements of AR NOAA 10871, obtained with the Extreme Ultraviolet Normal Incidence Spectrograph (EUNIS) sounding rocket instrument on 2006 April 12, reveal velocity oscillations in the He II 303.8Å emission line formed at T ≈ 5 × 10 K. The oscillations appear to arise in a bright active-region loop arcade about 25 wide which crosses the EUNIS slit. The period of these transitio...

We investigate the direct contribution of strong, sunspot-like magnetic fields to helioseismic wave travel-time shifts via two numerical forward models, a 3D ideal MHD solver and MHD ray theory. The simulated data cubes are analyzed using the traditional time-distance center-to-annulus measurement technique. We also isolate and analyze the direct contribution from purely thermal perturbations t...

BACKGROUND In the United States, skin cancer is the most commonly diagnosed cancer, with an estimated 5 million people treated per year and annual medical treatment expenditures that exceed 8 billion dollars. The purpose of this study was two-fold: 1) to enumerate the number of advertisements for skin products with and without Sun Protection Factor (SPF) and to further analyze the specific adve...

Archaeological indicators of cognitively modern behaviour become increasingly prevalent during the African Middle Stone Age (MSA). Although the exploitation of ochre is viewed as a key feature of the emergence of modern human behaviour, the uses to which ochre and ochre-based mixtures were put remain ambiguous. Here we present the results of an experimental study exploring the efficacy of ochre...

Recent analyses of solar photospheric abundances suggest that the oxygen abundance in the solar atmosphere needs to be revised downwards. In this study we investigate the consequence of this revision on helioseismic analyses of the depth of the solar convection zone and the helium abundance in the solar envelope and find no significant effect. We also find that the revised abundances along with...

The frequent occurrence of hard X-ray emission from the top of Ñaring loops was one of the discoveries by the Hard X-Ray Telescope on board the Japanese Yohkoh satellite. In this paper we take a Ñare current-sheet geometry and show how the combined e†ect of magnetic Ðeld convergence and pitchangle scattering of nonthermal electrons injected at the top of the loop results in the generation of a ...