ResearchFanshawe Magazine Issue 4

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NIRCam coronagraphic Lyot stop: design, fabrication, and testing

The NIRCam instrument on the James Webb Space Telescope (JWST) will provide a coronagraphic imaging capability to search for extrasolar planets in the 2 - 5 microns wavelength range. This capability is realized by a set of Lyot pupil stops with patterns matching the occulting mask located in the JWST intermediate focal plane in the NIRCam optical system. The complex patterns with transparent apertures are made by photolithographic process using a metal coating in the opaque region. The optical density needs to be high for the opaque region, and transmission needs to be high at the aperture. In addition, the Lyot stop needs to operate under cryogenic conditions. We will report on the Lyot stop design, fabrication and testing in this paper

NIRCam coronagraphic Lyot stop: design, fabrication, and testing

The NIRCam instrument on the James Webb Space Telescope (JWST) will provide a coronagraphic imaging capability to search for extrasolar planets in the 2 - 5 microns wavelength range. This capability is realized by a set of Lyot pupil stops with patterns matching the occulting mask located in the JWST intermediate focal plane in the NIRCam optical system. The complex patterns with transparent apertures are made by photolithographic process using a metal coating in the opaque region. The optical density needs to be high for the opaque region, and transmission needs to be high at the aperture. In addition, the Lyot stop needs to operate under cryogenic conditions. We will report on the Lyot stop design, fabrication and testing in this paper

Best Practices for Scientific Computing

Scientists spend an increasing amount of time building and using software. However, most scientists are never taught how to do this efficiently. As a result, many are unaware of tools and practices that would allow them to write more reliable and maintainable code with less effort. We describe a set of best practices for scientific software development that have solid foundations in research and experience, and that improve scientists' productivity and the reliability of their software.Comment: 18 page

Factors Associated with Revision Surgery after Internal Fixation of Hip Fractures

Background: Femoral neck fractures are associated with high rates of revision surgery after management with internal fixation. Using data from the Fixation using Alternative Implants for the Treatment of Hip fractures (FAITH) trial evaluating methods of internal fixation in patients with femoral neck fractures, we investigated associations between baseline and surgical factors and the need for revision surgery to promote healing, relieve pain, treat infection or improve function over 24 months postsurgery. Additionally, we investigated factors associated with (1) hardware removal and (2) implant exchange from cancellous screws (CS) or sliding hip screw (SHS) to total hip arthroplasty, hemiarthroplasty, or another internal fixation device. Methods: We identified 15 potential factors a priori that may be associated with revision surgery, 7 with hardware removal, and 14 with implant exchange. We used multivariable Cox proportional hazards analyses in our investigation. Results: Factors associated with increased risk of revision surgery included: female sex, [hazard ratio (HR) 1.79, 95% confidence interval (CI) 1.25-2.50; P = 0.001], higher body mass index (fo

Highway Robbery: Testing The Impact Of Interstate Highways On Robbery

Research has shown that the occurrence of crime is based on multiple factors including a variety of geographical characteristics. Previous researchers have suggested that the environmental feature of the interstate system has an influence on crime. For this study, we test for a relationship between interstate presence and robbery at the county-level in Georgia. Additionally, we test whether or not urban/rural differences affect this relationship. Findings are consistent with previous research showing that the number of interstate exits in a county significantly increases crime; in this case the robbery rate

Highway Robbery: Testing the Impact of Interstate Highways on Robbery

Research has shown that the occurrence of crime is based on multiple factors including a variety of geographical characteristics. Previous researchers have suggested that the environmental feature of the interstate system has an influence on crime. For this study, we test for a relationship between interstate presence and robbery at the county-level in Georgia. Additionally, we test whether or not urban/rural differences affect this relationship. Findings are consistent with previous research showing that the number of interstate exits in a county significantly increases crime; in this case the robbery rate

Violent Encounters: A Criminal Event Analysis Of Lethal And Nonlethal Outcomes

This study identifies key factors from the criminal events perspective that affect the lethality of violent encounters. Data for this research are derived from the National Incident-Based Reporting System of the FBI. Using logistic regression analysis, the effects of several contextual factors, including weapon, location, time of incident, circumstances, and victim and offender characteristics and relationships are explored. Analysis reveals that variables from each of the six categories affect the lethality of interpersonal violence, but the circumstance and type of weapon exert the strongest influence. Our investigation demonstrates the utility of the criminal events perspective for explaining the outcomes of violent encounters. © 2004, Sage Publications. All rights reserved