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[1] The hydroxyl free radical (OH) is the major oxidizing chemical in the atmosphere, destroying about 3.7 petagrams (Pg) of trace gases each year, including many gases involved in ozone depletion, the greenhouse effect and urban air pollution. Measurements of 1,1,1-trichloroethane (methyl chloroform, CH3CCl3), which reacts with OH, provide the most(More)
OBJECTIVE To add to the evidence on comparative long-term effects of insulin analog glargine versus human NPH insulin on the risk for cancer. RESEARCH DESIGN AND METHODS We identified cohorts of initiators of glargine and human NPH without an insulin prescription during the prior 19 months among patients covered by the Inovalon Medical Outcomes Research(More)
Extensive analyses of ozone observations between 1978 and 1998 measured by Dobson Umkehr, SAGE I and II, and SBUV and SBUV/2 indicate continued significant ozone decline throughout the extra-tropical upper stratosphere from 30-45 km altitude. The maximum annual linear decline of -0.8±0.2 (2σ) %/year occurs at 40 km and is well described in terms of a linear(More)
OBJECTIVES This study characterizes primary petroclival meningioma growth rates, before intervention, using volumetric analysis. In addition, predictors of growth are analyzed. METHODS Patients with previously untreated petroclival meningiomas were retrospectively reviewed (1999-2015). Image analysis software was used to perform volumetric analyses of(More)
C ontinuous-flow ventricular assist devices (CVADs) are more compact, less costly, and potentially more durable than pulsatile ventricular assist devices (PVADs). However, studies in animal models suggest that long-term continuous-flow support can result in hemodynamic dysfunction. This includes the disruption of the renin-angiotensin system and the(More)
OBJECTIVES To compute a benchmark for tracking readmission rates among patients enrolled in Medicare's private comprehensive Medicare Advantage (MA) plans and to develop preliminary comparisons with the fee-for-service (FFS) readmission rates. STUDY DESIGN Descriptive data presentation with analytic discussion. METHODS We computed a benchmark for(More)
Methyl chloroform (CH3CCl3, 1,1,1,-trichloroethane) was used widely as a solvent before it was recognized to be an ozone-depleting substance and its phase-out was introduced under the Montreal Protocol. Subsequently, its atmospheric concentration has declined steadily and recent European methyl chloroform consumption and emissions were estimated to be less(More)
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. [1] High-frequency, in situ observations from the Advanced Global Atmospheric(More)
In recent years, extensive research in the HCI literature has explored interactive techniques for digital fabrication. However, little attention in this body of work has examined how to involve and guide human workers in fabricating larger-scale structures. We propose a novel model of <i>crowdsourced fabrication</i>, in which a large number of workers and(More)
Carbon tetrachloride (CCl4) has substantial stratospheric ozone depletion potential and its consumption is controlled under the Montreal Protocol and its amendments. We implement a Kalman filter using atmospheric CCl4 measurements and a 3-dimensional chemical transport model to estimate the interannual regional industrial emissions and seasonal global(More)