Browsing FAS Scholarly Articles by Title

First Season QUaD CMB Temperature and Polarization Power Spectra

Ade, P.; Bock, J.; Bowden, M.; Brown, M. L.; Cahill, G.; Carlstrom, J. E.; Castro, P. G.; Church, S.; Culverhouse, T.; Friedman, R.; Ganga, K.; Gear, W. K.; Hinderks, J.; Kovac, John M; Lange, A. E.; Leitch, E.; Melhuish, S. J.; Murphy, J. A.; Orlando, A.; Schwarz, R.; O’Sullivan, C.; Piccirillo, L.; Pryke, C.; Rajguru, N.; Rusholme, B.; Taylor, A. N.; Thompson, K. L.; Wu, E. Y. S.; Zemcov, M. (IOP Publishing, 2008)

QUaD is a bolometric CMB polarimeter sited at the South Pole, operating at frequencies of 100 and 150 GHz. In this paper we report preliminary results from the first season of operation (austral winter 2005). All six CMB ...

First stars of the ρ Ophiuchi dark cloud

Pillitteri, I.; Wolk, Scott J.; Chen, Hope How-Huan; Goodman, Alyssa (EDP Sciences, 2016)

Star formation in molecular clouds can be triggered by the dynamical action of winds from massive stars. Furthermore, X-ray and UV fluxes from massive stars can influence the life time of surrounding circumstellar disks. ...

First Structure Formation: A Simulation of Small‐Scale Structure at High Redshift

Jang-Condell, Hannah; Hernquist, Lars (American Astronomical Society, 2001)

We describe the results of a simulation of collisionless cold dark matter in a Lambda CDM universe to examine the properties of objects collapsing at high redshift (z = 10). We analyze the halos that form at these early ...

The First Vlbi Detection of an Ultracool Dwarf: Implications for the Detectability of Sub-Stellar Companions

Forbrich, Jan; Berger, Edo (IOP Publishing, 2009)

We present milliarcsecond-resolution radio very long baseline interferometry (VLBI) observations of the ultracool dwarfs TVLM 513–46546 (M8.5) and 2MASS J00361617+1821104 (L3.5) in an attempt to detect sub-stellar companions ...

First-Person Action Experience Reveals Sensitivity to Action Efficiency in Prereaching Infants

Skerry, Amy; Carey, Susan E.; Spelke, Elizabeth S. (Proceedings of the National Academy of Sciences, 2013)

Do infants learn to interpret others’ actions through their own experience producing goal-directed action, or does some knowledge of others’ actions precede first-person experience? Several studies report that motor ...

First-principles calculations of the high-temperature phase transformation in yttrium tantalate

Feng, Jing; Shian, Samuel; Xiao, Bing; Clarke, David R. (American Physical Society (APS), 2014)

The high-temperature phase transition between the tetragonal (scheelite) and monoclinic (fergusonite) forms of yttrium tantalite (YTaO4 ) has been studied using a combination of first-principles calculations and a Landau ...

A First-Principles Model of Early Evolution: Emergence of Gene Families, Species, and Preferred Protein Folds

Chen, Peiqiu; Zeldovich, Konstantin B.; Shakhnovich, Eugene; Shakhnovich, Boris E. (Public Library of Science, 2007)

In this work we develop a microscopic physical model of early evolution where phenotype—organism life expectancy—is directly related to genotype—the stability of its proteins in their native conformations—which can be ...

First-Principles Semiclassical Initial Value Representation Molecular Dynamics

Ceotto, Michele; Atahan, Sule; Shim, Sangwoo; Tantardini, Gian Franco; Aspuru-Guzik, Alan (Royal Society of Chemistry, 2009)

In this work, we explore the use of the semiclassical initial value representation (SC-IVR) method with first-principles electronic structure approaches to carry out classical molecular dynamics. The proposed approach can ...

First-Principles Simulations of Conditions of Enhanced Adhesion Between Copper and TaN(111) Surfaces Using a Variety of Metallic Glue Materials

Han, Bo; Wu, Jinping; Zhou, Chenggang; Chen, Bei; Gordon, Roy Gerald; Lei, Xinjian; Roberts, David A.; Cheng, Hansong (Wiley-Blackwell, 2009)

Better than Elmer's glue: Three necessary conditions for enhancement of solid interfacial interactions guide materials design to create strong, stable composites for interfacial adhesion. Ab initio molecular dynamics ...

Fiscal Devaluations

Farhi, Emmanuel; Gopinath, Gita; Itskhoki, Oleg (Oxford University Press (OUP), 2014)

We show that even when the exchange rate cannot be devalued, a small set of conventional fiscal instruments can robustly replicate the real allocations attained under a nominal exchange rate devaluation in a dynamic New ...

Fiscal Discipline and the Cost of Public Debt Service: Some Estimates for OECD Countries

Ardagna, Silvia; Caselli, Francesco; Lane, Timothy (THe Berkeley Electronic Press, 2007)

We use a panel of 16 OECD countries over several decades to investigate the effects of government debts and deficits on long-term interest rates. In simple static specifications, a one-percentage-point increase in the ...

Fiscal Policy Composition, Public Debt, and Economic Activity

Ardagna, Silvia (Kluwer Academic Publishers, 2001)

This paper uses a dynamic general equilibrium model i) to investigate how changes to different spending and revenue items of the budget affect economic activity and public finance; and ii) to evaluate the welfare costs of ...

Fiscal Policy in Unionized Labor Markets

Ardagna, Silvia (Elsevier, 2007)

This paper investigates the effects of fiscal policy on economic activity, public finances, welfare, and income distribution in a dynamic general equilibrium model with a unionized labor market. The paper shows that ...

Fiscal Policy, Profits, and Investment

Alesina, Alberto; Ardagna, Silvia; Perotti, Roberto; Schiantarelli, Fabio (American Economic Association, 2002)

This paper evaluates the effects of fiscal policy on investment using a panel of OECD countries. We find a sizeable negative effect of public spending--and in particular of its wage component--on profits and on business ...

Fiscal Stabilizations: When Do They Work and Why

Ardagna, Silvia (Elsevier, 2004)

This paper studies the determinants and channels through which fiscal contractions influence the dynamics of the debt-to-GDP ratio and GDP growth. Using data from a panel of OECD countries, the paper shows that the success ...

Fish biorobotics: kinematics and hydrodynamics of self-propulsion

Lauder, George V.; Anderson, E. J.; Tangorra, J.; Madden, P. G. A. (The Company of Biologists, 2007)

As a result of years of research on the comparative biomechanics and physiology of moving through water, biologists and engineers have made considerable progress in understanding how animals moving underwater use their ...

‘Fish out of water’: a cross-sectional study on the interaction between social and neighbourhood effects on weight management behaviours

Green, M A; Subramanian, S.V. Venkata; Strong, M; Cooper, C L; Loban, A; Bissell, P (Nature Publishing Group, 2014)

Objective: To analyse whether an individual’s neighbourhood influences the uptake of weight management strategies and whether there is an interaction between individual socio-economic status and neighbourhood deprivation ...