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Effect of geometric sharpness on translucent material perception
No full textJournal of vision, Volume 20, Issue 7, 1 July 2020, Page 10.When judging the optical properties of a translucent object, humans often look at sharp geometric features such as edges and thin parts. An analysis of the physics of light transport shows that these sharp geometries are necessary for scientific imaging systems to be able to accurately measure the underlying material optical properties. In this article, we examine whether human perception of translucency is likewise affected by the presence of sharp geometry, by confounding our perceptual inferences about an object's optical properties. We use physically accurate simulations to create visual stimuli of translucent materials with varying shapes and optical properties under different illuminations. We then use these stimuli in psychophysical experiments, where human observers are asked to match an image of a target object by adjusting the material parameters of a match object with different geometric sharpness, lighting, and three-dimensional geometry. We find that the level of geometric sharpness significantly affects perceived translucency by observers. These findings generalize across a few illumination conditions and object shapes. Our results suggest that the perceived translucency of an object depends on both the underlying material's optical parameters and the three-dimensional shape of the object. We also find that models based on image contrast cannot fully predict the perceptual results
Socially-distanced neighborhood gathering
No full textA group of five people are gather, distanced from each other outside on T Street NW while holding beverages in front of row houses. One person sits on the stoop of a gated rowhouse.Cataloger note: Neighborhood information from hashtag
Pointer to dataset from: Survey of academic and research librarians in Germany and the USA
No full textThis dataset is available via openICPSR at: https://doi.org/10.3886/E120283V
Sign of high demand items with purchase limits at Whole Foods Market
No full textSign posted at Whole Food Market of high demand items that have purchase limits. Items include water; boxed dinners; bread; canned soup, vegetables, beans, seafood, and meat; dried beans; nut butters; oatmeal; pasta and pasta sauce; rice; and shelf-stable milk
2018-01 Guaranteed non-labor income and labor supply: the effect of the Alaska permanent fund dividend
No full textDepartment of Economics. Working Paper Series no. 2018-01. 32 pages.One peculiar source of non-labor income that has not been studied for its effect on labor supply is the Alaska Permanent Fund dividend. This is somewhat surprising given the recent policy focus on Guaranteed Basic Income programs. An annual lump-sum payment, the Permanent Fund Dividend (PFD) is available to almost all Alaska residents, is clearly exogenous with respect to work effort, and -- while relatively predictable -- varies over time and across households (since it increases linearly with family size). This paper estimates the non-labor income elasticity of labor supply using exogenous variation from the Alaskan PFD and data from the American Community Survey. The analysis finds that men have elasticities between -0.15 and -0.10, depending on the specification. Single women have elasticities between -0.14 and -0.11, while married women have somewhat larger elasticities between -0.18 and -0.11
Exterior view of the Car Barn Condominiums
No full textExterior view of the Car Barn Condominiums on East Capitol Street NE. Signs of hope and cheer hang in the windows on the second and third floors
2020 WASH YOUR HANDS' sign displayed in a small yard.
No full textIn a small yard in front of a brick building, the words '2020 WASH YOUR HANDS' are written on a miniature gravestone in front of a bush. A pair of blue-green hands are positioned to appear as though they are emerging out of the dirt in front of the gravestone. The yard also features a lawn gnome riding a unicorn and a blue pot
Flyer taped to a pole advertising assistance for senior citizens and immunocompromised people offered by The Table Church
No full textSign reads 'Senior Citizens and Immuno-Compromised Friends who are high risk during the COVID-19 Pandemic: We have hundreds of volunteers ready to help you so you don't have to leave your house during the pandemic crisis (in most areas of DC, Virginia, and Maryland). We can help you by: Doing your grocery shopping. Picking up prescriptions and supplies. Walking your dog. Driving you to the doctor. Doing regular phone or video chats to foster community and friendship. Visit www.TheTableChurchDC.org/Coronavirus-Assistance. On this website you can: Request Assistance. Volunteer to assist others. Donate supplies or funds for at-risk community members. Please take care of your health and the health in our communities by letting us do the things you shouldn't be doing outside of your home right now. The less people become exposed to the virus, the more our health care system will be able to cope with the onslaught of patients.