Browsing FAS Scholarly Articles by Title
Now showing items 5496-5515 of 18296
-
Experimental Designs for Identifying Causal Mechanisms
(Wiley, 2012-11-01) -
Experimental evidence for the importance of convected methylhydroperoxide as a source of hydrogen oxide (HO x ) radicals in the tropical upper troposphere
(Wiley-Blackwell, 2001)Concurrent measurements of OH, HO2, H2O2, and CH3OOH concentrations were made during an aircraft flight over the tropical South Pacific that followed a back-and-forth pattern at constant 10 km altitude for 4 hours. One end ... -
Experimental interrogation of the path dependence and stochasticity of protein evolution using phage-assisted continuous evolution
(Proceedings of the National Academy of Sciences, 2013)To what extent are evolutionary outcomes determined by a population's recent environment, and to what extent do they depend on historical contingency and random chance? Here we apply a unique experimental system to investigate ... -
An experimental investigation of evolutionary dynamics in the Rock-Paper-Scissors game
(Nature Publishing Group, 2015)Game theory describes social behaviors in humans and other biological organisms. By far, the most powerful tool available to game theorists is the concept of a Nash Equilibrium (NE), which is motivated by perfect rationality. ... -
Experimental Observables Near a Nematic Quantum Critical Point in the Pnictide and Cuprate Superconductors
(American Physical Society, 2008)The newly discovered high temperature superconductor SmFeAs(\(O_{1-x}F_x\)) shows a clear nematic transition where the square lattice of Fe ions has a rectangular distortion. Similar nematic ordering has also been observed ... -
Experimental Observation of the Crystallization of Hard-Sphere Colloidal Particles by Sedimentation onto Flat and Patterned Surfaces
(American Physical Society, 2009)We present a confocal microscopy study of 1.55micrometers monodisperse silica hard spheres as they sediment and crystallize at the bottom wall of a container. If the particles sediment onto a featureless flat wall, the two ... -
Experimental Test of Morphological Stability Theory for a Planar Interface During Rapid Solidification
(American Physical Society, 1998)We report a parameter-free test of the theory predicting the critical solute concentration that destabilizes a planar solid-liquid interface in the high-velocity regime where nonequilibrium interface kinetics are important. ... -
Experimentally Testing the Role of Foundation Species in Forests: The Harvard Forest Hemlock Removal Experiment
(British Ecological Society, 2010)1. Problem statement– Foundation species define and structure ecological systems. In forests around the world, foundation tree species are declining due to overexploitation, pests and pathogens. Eastern hemlock (Tsuga ... -
Experiments Are Revealing a Foundation Species: A Case-Study of Eastern Hemlock (Tsuga canadensi)
(Hindawi Publishing Corporation, 2014)Foundation species are species that create and define particular ecosystems; control in large measure the distribution and abundance of associated flora and fauna; and modulate core ecosystem processes, such as energy flux ... -
Expertise, Common Sense, and the Atkins Diet
(University of Toronto Press, 2007) -
Explaining "Memories" of Space Alien Abduction and Past Lives: An Experimental Psychopathology Approach
(Textrum, 2012)In this article, I describe how my colleagues, students, and I have used the methods of experimental psychopathology to explain why seemingly sincere, nonpsychotic people claim to have memories of being abducted by space ... -
Explaining Away A Model of Affective Adaptation
(Blackwell Publishing, 2008)We propose a model of affective adaptation, the processes whereby affective responses weaken after one or more exposures to emotional events. Drawing on previous research, our approach, represented by the acronym AREA, ... -
Explaining human multiple object tracking as resource-constrained approximate inference in a dynamic probabilistic model
(Massachusetts Institute of Technology Press, 2009)Multiple object tracking is a task commonly used to investigate the architecture of human visual attention. Human participants show a distinctive pattern of suc- cesses and failures in tracking experiments that is often ... -
Explaining the Poor Performance of Consumption-Based Asset Pricing Models
(Blackwell Publishing, 2000)We show that the external habit-formation model economy of Campbell and Cochrane (1999) can explain why the Capital Asset Pricing Model (CAPM) and its extensions are betterapproximate asset pricing models than is the ... -
Explaining the Structure of the Archean Mass-Independent Sulfur Isotope Record
(American Association for the Advancement of Science (AAAS), 2010)Sulfur isotopes in ancient sediments provide a record of past environmental conditions. The long–time-scale variability and apparent asymmetry in the magnitude of minor sulfur isotope fractionation in Archean sediments ... -
The Explanatory Ambitions of Moral Principles
(Wiley, 2018-02-08)Moral properties are explained by other properties. And moral principles tell us about moral properties. How are these two ideas related? In particular, is the truth of a given moral principle part of what explains why a ... -
Explicit Towers of Drinfeld Modular Curves
(Springer Verlag, 2001)We give explicit equations for the simplest towers of Drinfeld modular curves over any finite field, and observe that they coincide with the asymptotically optimal towers of curves constructed by Garcia and Stichtenoth. -
Exploiting Locality in Quantum Computation for Quantum Chemistry
(American Chemical Society (ACS), 2014)Accurate prediction of chemical and material properties from first principles quantum chemistry is a challenging task on traditional computers. Recent developments in quantum computation offer a route towards highly accurate ... -
Exploiting non-equilibrium phase separation for self-assembly
(Royal Society of Chemistry (RSC), 2016)Demixing can occur in systems of two or more particle species that experience different driving forces, e.g., mixtures of self-propelled active particles or of oppositely charged colloids subject to an electric field. Here ... -
Exploiting pattern transformation to tune phononic band gaps in a two-dimensional granular crystal
(Acoustical Society of America, 2012)The band structure of a two-dimensional granular crystal composed of silicone rubber and polytetrafluoroethylene (PTFE) cylinders is investigated numerically. This system was previously shown to undergo a pattern ...