1,159 research outputs found
An Interview with Cass R. Sunstein: Author of The World According to Star Wars
No full textThe guest editors of special issue 12, Jason W. Ellis and Sean Scanlan, interview Cass R. Sunstein, the Robert Walmsley University Professor at Harvard, where he is founder and director of the Program on Behavioral Economics and Public Policy. He is the author of many books, including the bestseller Nudge: Improving Decisions about Health, Wealth, and Happiness (with Richard H. Thaler). His 2016 book The World According to Star Wars attempts to understand the Star Wars universe in ten chapters through the lenses of Sunstein’s academic interests, namely: culture, sociology, psychology, behavioral science, and political science. The book is both personal and theoretical, practical and academic. It takes accurate measure of the genesis of the movies, the movies themselves, and briefly, but trenchantly, it examines concepts such as reputational cascades and speculates on what Star Wars can teach viewers about constitutional disputes
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The crowd funding services handbook ::raising the money you need to finance your business, project, or invention /
No full text"In The Crowdsource Funding Services Handbook, author Jason R. Rich offers a step-by-step overview of the various crowdsource funding services available on the Web, as well as the necessary documentation required to launch a successful crowdfunding campaign."-
Neotectonic map of the Cascadia margin
No full textby Chris Goldfinger, Jeffrey Beeson, Chris Romsos and Jason R. Patton.This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references (pages 15-20).Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Letter from Jason Lee to Mr. Harry R. Oakley, Evacuee Property Supervisor, February 22, 1943
No full textResponse to previous letter, regarding property left by Japanese American farmers
Social facilitation: salience and mediated, anticipatory, and residual presence
No full textSocial facilitation is the oldest experimental concept in social psychology. Throughout decades of social facilitation research, social presence has typically been viewed as a dichotomous variable which affects individuals while performing a task. However, this dissertation attempts to investigate whether social presence may be viewed as continuous variable, differing on the salience of presence. In addition, it seeks to determine whether changes in performance can be elicited by prior social presence (residual presence) and the expectation of future social presence (anticipatory presence). Study 1 compared the effects of 6 different levels of presence (absence, artificial presence, passive presence, implied presence, embodied presence, and active presence) on simple and complex task performance. It provides evidence that the various levels of social presence did have a differential impact on participants. From the questionnaire responses, social presence was able to be classified into three distinct categories: low (absence, artificial and passive presence), intermediate (implied presence), and high salience (embodied and active presence). Study 1 also provides some support for the expectation that presence results in simple task facilitation. However, instead of an expected linear relationship between salience of presence and simple task enhancement, a quadratic inverted U-shaped curve was observed. Implied presence, a type of presence of intermediate salience, produced the strongest effects. Study 2 showed that social presence can enhance simple task performance even after the stimulus has been removed (residual presence). Study 2 also provided some indication that anticipating a supervisor could cause social facilitation effects even before the supervisor’s arrival. Questionnaire responses showed that participants expecting the presence of a supervisor, like those exposed to residual presence, were more affected on perceived distraction, immediacy, impact, and stress compared to control participants. Implications of the present results provide the rationale for a modified conceptualization of social facilitation.Ph. D.Includes bibliographical referencesby Jason Matthew Glushako
Randomized controlled trial of a diversion program for individuals with a history of repeat felony property crime and substance use
No full textMichael R. McCart, Ph.D., Jason E. Chapman, Ph.D., Zoe Alley, Ph.D., & Ashli J. Sheidow, Ph.D.Title from PDF title page (viewed on May 5, 2022)."This summary reports findings from a randomized controlled trial (RCT) of a front-end diversion program for non-violent, repeat felony property offenders who have a substance use problem and motivation to change their behavior. Oregon's Senate Bill 416 (SB416) program was developed by state leaders seeking an alternative to prison for individuals who were committing property crimes, at least in part, to support their use of illicit substances"--Page 5.This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references (pages 35-36).Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Study of simplified models of aircraft structures subjected to generalized explosive loading
No full textThis dissertation develops a simple methodology for estimating the maximum elastic-plastic deformation of thin, rectangular plates due to an exponentially decaying pressure pulse. Initially, only small plates, representative of aircraft skin panels, and uniformly distributed pressures are examined. The deflections predicted by this procedure are compared with those attained from finite element analysis for various plate dimensions and blast intensities. Material properties and boundary conditions are also varied. It is found that the current, clamped single-degree-of-freedom model is generally a much better predictor of deflection than its simply supported counterpart, although both show average errors of less than 15% compared to finite element results. The deviations between all of the models tend to decrease as surface area decreases, or as plate thickness and aspect ratio increase. A means of approximating permanent plate deflection is also suggested, which favorably compares with previously published experimental results for square, aluminum plates.
The aforementioned procedure is then extended for use with larger geometries, namely a wider fuselage section and a panel of an onboard luggage container, and nonuniform pressures. A generalized distribution function is developed to account for nonuniformities consistent with detonations at a small standoff distance. Moreover, two normalized criteria are proposed to determine when these nonuniformities can be ignored. In addition, large discrepancies are found in calculated deflections when incorporating the current structural model and the blast parameter data from two commonly used sources for both uniform and nonuniform loading cases. As a result, uncertainties in these data are thoroughly examined, which leads to confidence bounds being placed on all calculated deflections through a Monte Carlo scheme. This, in turn, allows for the generation of probability of failure curves.
Suggestions for improving the current loading and structural models are also discussed. Finally, the method of analysis for plates is preliminarily extended for the blast loading of thin, cylindrical shells. The various topics covered and simplified models proposed are useful to both the experimentalist and designer of blast resistant structures.Ph.D.Includes bibliographical references (p. 141-147)
Swirling flow of viscoelastic fluids
No full textDeposited with permission of the author. © 1998 Jason R. Stokes.The ability to understand and predict the flow behaviour of non-Newtonian fluids in swirling flow is industrially important for the efficient design and performance of processes which utilise fluids with complex rheological properties. In particular, fluids with elastic properties are not well described by non-Newtonian constitutive models, such that predictions using such models must be carefully validated. A benchmark problem is proposed here which provides a well defined geometry to study the swirling flow of non-Newtonian fluids as a test case for the validation of constitutive models. The confined swirling flow utilised is a torsionally driven cavity where the test fluid is confined in a cylinder with a rotating bottom lid, and stationary side walls and top lid. The flow field is three-dimensional and consists of both a primary motion, which is directed azimuthally, and a secondary motion, which is located in the radial and axial plane of the cylinder and driven by inertial and/or elastic forces
2-Ruled Calibrated 4-folds in R^7 and R^8
No full textIn this paper we introduce the area of 2-ruled 4-folds in R^n (n=7 or 8), that is, submanifolds M of R^n that admit a fibration over some 2-fold Sigma such that each fibre is an affine 2-plane in R^n. This is motivated by the paper math.DG/0012060 by Joyce on ruled special Lagrangian 3-folds in C^3 and the work of the author in math.DG/0401123 on ruled associative 3-folds in R^7. We say that a 2-ruled 4-fold M is r-framed if we are given an oriented basis for each fibre in a smooth manner, and in such circumstances we may write M in terms of orthogonal smooth maps phi_1,phi_2:Sigma-->S^(n-1) and a smooth map psi:Sigma-->R^n. We focus on 2-ruled Cayley 4-folds since coassociative and special Lagrangian 4-folds can be considered as special cases. The main result is on non-planar, r-framed, 2-ruled Cayley 4-folds in R^8, which characterises the Cayley condition in terms of a coupled system of nonlinear, first-order, partial differential equations that phi_1 and phi_2 satisfy, and another such equation on psi which is linear in psi. We deduce that, for a fixed non-planar, r-framed, 2-ruled Cayley cone M_0, the space of r-framed 2-ruled Cayley 4-folds M which have asymptotic cone M_0 has the structure of a vector space. We give a means of constructing 2-ruled Cayley 4-folds M starting from a 2-ruled Cayley cone M_0, satisfying a certain condition, using holomorphic vector fields such that M_0 is the asymptotic cone of M. We use this to construct explicit examples of U(1)-invariant 2-ruled Cayley 4-folds asymptotic to a U(1)^3-invariant 2-ruled Cayley cone. Examples are also given based on ruled calibrated 3-folds in C^3 and R^7 and complex cones in C^4
In the wake of turbulence: A study on the effects of freestream turbulence on the flow around simple and complex geometries
No full textWith the growing demand of global energy consumption and a need to reduce pollution caused by energy production from fossil fuels, renewable sources of energy are becoming increasingly necessary for the future sustainable development of our society. Wind energy offers an attractive option as one of the renewable sources, and a large body of work is currently ongoing to widen its implementation. This thesis seeks to contribute to this growing body through experimental investigations into how turbulent flows interact with wind turbines, both in part and in whole, and from that, gain insights into how the interactions impact their performance. The complex and turbulent environment of atmospheric boundary layers, in which wind turbines operate, presents an intriguing challenge. The work is divided into three main investigative topics: the spatial development of a turbulent boundary layer under decaying freestream turbulence, the effect of freestream turbulence on the performance of a wind turbine airfoil, and lastly, the near-field of a model wind turbine under turbulent shear flows.
The first investigation examined how a turbulent boundary layer evolves in the streamwise direction under the influence of decaying freestream turbulence. The experiment was performed in the new water channel facility at the Norwegian University of Science and Technology. The objective was to gain insight into the physics of a representative background flow that can be expected for wind turbines. Laser Doppler velocimetry was used to characterize both the freestream turbulence and the boundary layer. The main finding is that the effects of decaying freestream turbulence on the properties of the turbulent boundary layer diminish as they coevolve downstream. This is reflected in both the behaviour of the wake region in the boundary layer, as well as the peak in the velocity fluctuations near the wall.
The second set of experiments looked into how freestream turbulence affects the pressure and lift characteristics of a wind turbine airfoil. Pressure distributions are taken at different angles of attack and for different incoming turbulence intensities. It is found that increasing the freestream turbulence intensity generally increases the maximum lift for this airfoil, but it does not noticeably change the stall angle. Lift within the linear operating range also shows improvement with increasing turbulence intensity. However, for low turbulence intensities, a decrease in lift in the linear region is observed. Further analysis into the pressure fluctuation spectra near the trailing edge reveals the presence of periodic pressure fluctuations for these cases.
Lastly, moving from the component to the system level, a model wind turbine was placed in different turbulent shear flows generated by an active grid. Particle image velocimetry was used to capture the near-field around the model. It was found that the near-wake velocity deficit can be decomposed into a velocity deficit profile caused by a uniform inflow plus the incoming shear profile. The combined profile shows higher shear gradient on the high-velocity side of the incoming shear flow, and this in turn leads to higher turbulence production and thus higher velocity fluctuations. The turbine power fluctuations were found to be proportional to turbulence intensity, regardless of the shear profile, and the kinetic energy available in the flow for downstream turbines was also found to be mainly dependent on the incoming turbulence intensity.
Overall, this thesis examines the influence of turbulent flows on a wind turbine from the perspective of the background flow level, the component level, and lastly, the system level. The work provides new insights into how these three levels are affected by the presence of turbulence, and it is the hope of the author that it will contribute meaningfully to the field of wind energy and turbulence research, and become a building block upon which other works can be advanced upon
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