838 research outputs found
Visual Representations of Gender and Computing in Consumer and Professional Magazines
Studies in the nineteen-eighties showed that advertising images of computers were gendered, with women relatively less represented, and shown with less empowered roles, problems or presented as sexual objects. This paper uses a mix of content and interpretative analysis to analyse current imagery in consumerist and professional society publications. It reveals the present variation and complexity of the iconography of computers and people across different domains of representation, with the continuation of gender bias in subtle forms
Quasar candidate selection and photometric redshift estimation based on SDSS and UKIDSS data
We present a sample of 8498 quasars with both SDSS optical and UKIDSS
near-IR photometric data. With this sample, we obtain the median
colour-z relations based on 7400 quasars with magnitude uncertainties less than
0.1mag in all bands. By analyzing the quasar colours, we propose an empirical
criterion in the vs. colour-colour diagram to separate stars and
quasars with redshift , and two other criteria for selecting high-z
quasars. Using the SDSS-UKIDSS colour-z relations, we estimate the photometric
redshifts of 8498 SDSS-UKIDSS quasars, and find that 85.0% of them are
consistent with the spectroscopic redshifts within , which
leads to a significant increase of the photometric redshift accuracy than that
based on the SDSS colour-z relations only. We compare our colour selection
criterion with a small UKIDSS/EDR quasar/star sample and a sample of 4671
variable sources in the SDSS Stripe 82 region with both SDSS and UKIDSS data,
and find that they can be clearly divided into two classes (quasars and stars)
by our criterion in the vs. plot. We select 3834 quasar candidates
from the variable sources with in Stripe 82, 826 of them being SDSS
quasars and the rest without SDSS spectroscopy. We demonstrate that even at the
same spectroscopy limit as SDSS, with our criterion we can at least partially
recover the missing quasars with in SDSS. The SDSS identified
quasars only take a small fraction (21.5%) of our quasar candidates selected
from the variable sources in Stripe 82, indicating that a deeper spectroscopy
is very promising in producing a larger sample of quasars than SDSS. The
implications of our results to the future Chinese LAMOST quasar survey are also
discussed.Comment: 13 pages, 13 figures, 2 tables, accepted for publication in MNRA
Recommended from our members
Life in the Atacama â Year 2: Geologic reconnaissance through long-range roving and implications on the search for life
The Life in the Atacama-2004 project, which included geological, morphological, and mineralogical mapping through combined satellite, field-based, and microscopic perspectives and long-range roving, led to the localization of potential habitats
Recommended from our members
Spectroscopic results from the Life in the Atacama (LITA) project 2004 field season
Analysis of spectroscopy datasets from rover field tests in the Atacama Desert (Chile), focusing on the composition of the surface and identification of potential habitats for life
Recommended from our members
Searching for life with rovers: exploration methods and science results from the 2004 field campaign of the âLife in the Atacamaâ project and applications to future Mars Missions
LITA develops and field tests a long-range automated rover and a science payload to search for microbial life in the Atacama. The Atacama's evolution provides a unique training ground for designing and testing exploration strategies and life detection methods for the search for life on Mars
Recommended from our members
Use of a novel rover-mounted fluorescence imager and fluorescent probes to detect biological material in the Atacama Desert in daylight
We deployed our fluorescence imaging system which detects fluorescence signals from sparse microorganisms and biofilms on Carnegie Mellon Universityâs autonomous rover ZoĂ«. The results of the 2004 Atacama Desert field season, in Chile, are discussed
Effect of daily chlorhexidine bathing on hospital-acquired infection
BACKGROUND
Results of previous single-center, observational studies suggest that daily bathing of patients with chlorhexidine may prevent hospital-acquired bloodstream infections and the acquisition of multidrug-resistant organisms (MDROs).
METHODS
We conducted a multicenter, cluster-randomized, nonblinded crossover trial to evaluate the effect of daily bathing with chlorhexidine-impregnated washcloths on the acquisition of MDROs and the incidence of hospital-acquired bloodstream infections. Nine intensive care and bone marrow transplantation units in six hospitals were randomly assigned to bathe patients either with no-rinse 2% chlorhexidineâ impregnated washcloths or with nonantimicrobial washcloths for a 6-month period, exchanged for the alternate product during the subsequent 6 months. The incidence rates of acquisition of MDROs and the rates of hospital-acquired bloodstream infections were compared between the two periods by means of Poisson regression analysis.
RESULTS
A total of 7727 patients were enrolled during the study. The overall rate of MDRO acquisition was 5.10 cases per 1000 patient-days with chlorhexidine bathing versus 6.60 cases per 1000 patient-days with nonantimicrobial washcloths (P=0.03), the equivalent of a 23% lower rate with chlorhexidine bathing. The overall rate of hospital-acquired bloodstream infections was 4.78 cases per 1000 patient-days with chlorhexidine bathing versus 6.60 cases per 1000 patient-days with nonantimicrobial washcloths (P=0.007), a 28% lower rate with chlorhexidine-impregnated washcloths. No serious skin reactions were noted during either study period.
CONCLUSIONS
Daily bathing with chlorhexidine-impregnated washcloths significantly reduced the risks of acquisition of MDROs and development of hospital-acquired bloodstream infections. (Funded by the Centers for Disease Control and Prevention and Sage Products; ClinicalTrials.gov number, NCT00502476.
Recommended from our members
Implementation of a daylight fluorescence imaging system to autonomously detect biomarkers of extant life in the Atacama Desert
We have integrated a biomarker detection system with a rover for the search for sparse life in extreme environments. The system incorporated a pulsed fluorescence imager, a reagent sprayer, and a surface scraping device for remote detection of fluorescence signals
Effectiveness and cost of radiofrequency ablation and stereotactic body radiotherapy for treatment of earlyâstage hepatocellular carcinoma: An analysis of SEERâmedicare
IntroductionFor earlyâstage hepatocellular carcinoma (HCC) patients, ablative strategies are potentially curative treatment options. Stereotactic body radiotherapy (SBRT) has emerged as a promising ablative therapy, although its comparison with radiofrequency ablation (RFA) remains confined to a single institution retrospective review. We sought to characterize the comparative outcomes and cost between the two treatment strategies.MethodsWe conducted a secondary analysis of the Surveillance, Epidemiology, and End Results (SEER)âMedicare linked database (2004â2011) and identified adult patients with stage I or II HCC and treated with RFA or SBRT as the initial treatment within 6 months of diagnosis. Survival analysis was conducted using KaplanâMeier curves and multivariate Cox proportional hazard analysis. Factors associated with overall survival and 90âday hospital admission postâtreatment were identified using propensity score (PS) adjusted multivariate analysis. We performed costs analysis and calculated incremental costâeffectiveness ratios (ICER).ResultsFour hundred and forty patients were identified, 408 treated with RFA and 32 SBRT. In the overall cohort, 90âday hospitalization and 1âyear mortality were similar between groups but RFA patients had better overall survival (P < 0.001). Multivariate analysis showed advanced age, higher stage, decompensated cirrhosis, and treatment with SBRT (HR 1.80; 95%CI: 1.15â2.82) was associated with worse survival, but in the PS adjusted analysis, survival and costs were similar between the two groups.ConclusionIn a national cohort of early stage HCC patients, treatment with RFA vs SBRT resulted in no significant difference in survival, 90âday hospitalization, or costs. These data highlight the need for a randomized clinical trial comparing these two modalities.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/146355/1/jmiro12754_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/146355/2/jmiro12754.pd
Tell Es-Sultan (Jericho): Radiocarbon Results of Short-Lived Cereal and Multiyear Charcoal Samples from the End of the Middle Bronze Age
- âŠ