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Articles 1 - 30 of 54
Full-Text Articles in Entire DC Network
Historically Informed Rendering Of The Librettos From Bach's Church Cantatas, Michael Marissen
Historically Informed Rendering Of The Librettos From Bach's Church Cantatas, Michael Marissen
Music Faculty Works
No abstract provided.
Oecd's Fdi Regulatory Restrictiveness Index: Revision And Extension To More Economies, T. Koyama, Stephen S. Golub
Oecd's Fdi Regulatory Restrictiveness Index: Revision And Extension To More Economies, T. Koyama, Stephen S. Golub
Economics Faculty Works
This paper provides a revised measure of regulatory restrictions on inward foreign direct investment (FDI) for OECD countries and extends the approach to 13 non-member countries. The methodology is largely similar to that adopted in the previous version of the OECD indicator and covers three broad categories of restrictions: limitations on foreign ownership, screening or notification procedures, and management and operational restrictions. The FDI restrictiveness indicator captures statutory deviations from "national treatment", i.e. discrimination against foreign investment. When combined with other factors having an influence on foreign investment decisions, it has proven to be a good predictor of countries' inward …
Is Teaching Always Local, Education Global?, Peter Schmidt
Is Teaching Always Local, Education Global?, Peter Schmidt
English Literature Faculty Works
No abstract provided.
Review Of "Vienna And The Fall Of The Habsburg Empire: Total War And Everyday Life In World War I" By M. Healy, Pieter M. Judson , '78
Review Of "Vienna And The Fall Of The Habsburg Empire: Total War And Everyday Life In World War I" By M. Healy, Pieter M. Judson , '78
History Faculty Works
No abstract provided.
Review Of "Plant Exploration For Longwood Gardens" By T. Aniśko, Nicholas J. Kaplinsky
Review Of "Plant Exploration For Longwood Gardens" By T. Aniśko, Nicholas J. Kaplinsky
Biology Faculty Works
No abstract provided.
Crush The Sunnis, James Kurth
Crush The Sunnis, James Kurth
Political Science Faculty Works
The article argues that Iraq's Sunni population must be made to pay for the murderous years of the Baathist regime and should be left stateless and bereft of power. The author proposes giving the Shiites southern Iraq in its entirety and Kurds Kurdistan. He acknowledges that Shiites may become puppets of Iran, but not for long. This arrangement would have the added benefit of preserving America's oil supplies in the Middle East.
Fluorescence Blinking Statistics From Cdse Core And Core/Shell Nanorods, S. Wang, C. Querner, Thomas B. Emmons , '08, M. Drndic, Catherine Hirshfeld Crouch
Fluorescence Blinking Statistics From Cdse Core And Core/Shell Nanorods, S. Wang, C. Querner, Thomas B. Emmons , '08, M. Drndic, Catherine Hirshfeld Crouch
Physics & Astronomy Faculty Works
We report fluorescence blinking statistics measured from single CdSe nanorods (NRs) of seven different sizes with aspect ratios ranging from 3 to 11. This study also included core/shell CdSe/ZnSe NRs and core NRs with two different surface ligands producing different degrees of surface passivation. We compare the findings for NRs to our measurements of blinking statistics from spherical CdSe core and CdSe/ZnS core/shell nanocrystals (NCs). We find that, for both NRs and spherical NCs, the off-time probability distributions are well described by a power law, while the on-time probability distributions are best described by a truncated power law, P(tau(on)) similar …
Rovibrational Resonance Effects In Collision-Induced Electronic Energy Transfer: I2(E,V=0-2)+Cf4, J. M. Hutchison, Benjamin Robert Booth Carlisle , '05, Thomas Alex Stephenson
Rovibrational Resonance Effects In Collision-Induced Electronic Energy Transfer: I2(E,V=0-2)+Cf4, J. M. Hutchison, Benjamin Robert Booth Carlisle , '05, Thomas Alex Stephenson
Chemistry & Biochemistry Faculty Works
Collisions of I-2 in the E(0(g)(+)) electronic state with CF4 molecules induce electronic energy transfer to the nearby D, beta, and D-' ion-pair states. Simulations of dispersed fluorescence spectra reveal collision-induced electronic energy transfer rate constants and final vibrational state distributions within each final electronic state. In comparison with earlier reports on I-2(upsilon(E)=0-2) collisions with He or Ar atoms, we find markedly different dynamics when I-2, excited to the same rovibronic states, collides with CF4. Final vibrational state distributions agree with the associated Franck-Condon factors with the initially prepared state to a greater degree than those found with He or …
Penned, Nathalie Anderson
A Republic, If We Can Build It, Richard M. Valelly
A Republic, If We Can Build It, Richard M. Valelly
Political Science Faculty Works
No abstract provided.
Measurements And Analysis Of Helium-Like Triplet Ratios In The X-Ray Spectra Of O-Type Stars, M. A. Leutenegger, F. B.S. Paerels, S. M. Kahn, David H. Cohen
Measurements And Analysis Of Helium-Like Triplet Ratios In The X-Ray Spectra Of O-Type Stars, M. A. Leutenegger, F. B.S. Paerels, S. M. Kahn, David H. Cohen
Physics & Astronomy Faculty Works
We discuss new methods of measuring and interpreting the forbidden-to-intercombination line ratios of heliumlike triplets in the X-ray spectra of O- type stars, including accounting for the spatial distribution of the X-ray-emitting plasma and using the detailed photospheric UV spectrum. Measurements are made for four O stars using archival Chandra HETGS data. We assume an X- ray-emitting plasma spatially distributed in the wind above some minimum radius R-0. We find minimum radii of formation typically in the range of 1.25 < R-0 / R-* < 1.67, which is consistent with results obtained independently from line profile fits. We find no evidence for anomalously low f / i ratios, and we do not require the existence of X-ray-emitting plasmas at radii that are too small to generate sufficiently strong shocks.
Cinema Solidarity: The Documentary Practice Of Kim Longinotto, Patricia White
Cinema Solidarity: The Documentary Practice Of Kim Longinotto, Patricia White
Film & Media Studies Faculty Works
No abstract provided.
Review Of "Veiled Visions: The 1906 Atlanta Race Riot And The Reshaping Of American Race Relations" By D. F. Godshalk, Allison Dorsey
Review Of "Veiled Visions: The 1906 Atlanta Race Riot And The Reshaping Of American Race Relations" By D. F. Godshalk, Allison Dorsey
History Faculty Works
No abstract provided.
Dipole Trapped Spheromak In A Prolate Flux Conserver, Michael R. Brown, C. D. Cothran, Jerome Fung , '06, M. Chang, Jason Alexander Horwitz , '07, M. J. Schaffer, J. Leuer, E. V. Belova
Dipole Trapped Spheromak In A Prolate Flux Conserver, Michael R. Brown, C. D. Cothran, Jerome Fung , '06, M. Chang, Jason Alexander Horwitz , '07, M. J. Schaffer, J. Leuer, E. V. Belova
Physics & Astronomy Faculty Works
This paper reports the observation and characterization of a spheromak formed in the Swarthmore Spheromak Experiment (SSX, [M. R. Brown, Phys. Plasmas 6, 1717 (1999)]) and trapped in a simple dipole magnetic field. The spheromak is studied in a prolate (tilt unstable) 0.4 m diameter, 0.6 m length copper flux conserver in SSX. This plasma does not tilt, despite the prolate flux conserver. The spheromak is characterized by a suite of magnetic probe arrays for magnetic structure B(r,t), ion Doppler spectroscopy for T-i and flow, and interferometry for n(e). Three-dimensional magnetohydrodynamics simulations of this configuration verify its gross sta-bility. (c) …
Advising A Precollege Curriculum Project, Stephen B. Maurer , '67, W. Mccallum
Advising A Precollege Curriculum Project, Stephen B. Maurer , '67, W. Mccallum
Mathematics & Statistics Faculty Works
No abstract provided.
O Princípio De Precaução E A Autonomia Da Ciência, Hugh Lacey
O Princípio De Precaução E A Autonomia Da Ciência, Hugh Lacey
Philosophy Faculty Works
The Precautionary principle recommends taking special precautions, and conducting detailed and farreaching research on the potential risks of technoscientific innovations, before implementing them. Its use is defended against the charge that it threatens the autonomy of science. On the contrary, I argue, it actually serves to counter current distortions of scientific practices that follow from their having been subordinated to commercial and political values.
O princípio de precaução recomenda que, antes de implementar as inovações tecnocientíficas, sejam tomadas precauções especiais e que se conduza pesquisa detalhada e de largo alcance sobre os riscos potenciais dessas inovações. Defendo o uso do …
Review Of "Creole Religions Of The Caribbean: An Introduction From Vodou And Santeria To Obeah And Espiritismo" By M.F. Olmos And L. Paravisini-Gebert, Yvonne Patricia Chireau
Review Of "Creole Religions Of The Caribbean: An Introduction From Vodou And Santeria To Obeah And Espiritismo" By M.F. Olmos And L. Paravisini-Gebert, Yvonne Patricia Chireau
Religion Faculty Works
No abstract provided.
The Effect Of Porosity On X-Ray Emission-Line Profiles From Hot-Star Winds, S. P. Owocki, David H. Cohen
The Effect Of Porosity On X-Ray Emission-Line Profiles From Hot-Star Winds, S. P. Owocki, David H. Cohen
Physics & Astronomy Faculty Works
We investigate the degree to which the nearly symmetric form of X- ray emission lines seen in Chandra spectra of early- type supergiant stars could be explained by the possibly porous nature of their spatially structured stellar winds. Such porosity could effectively reduce the bound- free absorption of X- rays emitted by embedded wind shocks, and thus allow a more similar transmission of redshifted and blueshifted emission from the back and front hemispheres, respectively. To obtain the localized self- shielding that is central to this porosity effect, it is necessary that the individual clumps be optically thick. In a medium …
Dancing Into Modernity: Multiple Narratives Of India's Kathak Dance, Pallabi Chakravorty
Dancing Into Modernity: Multiple Narratives Of India's Kathak Dance, Pallabi Chakravorty
Dance Faculty Works
No abstract provided.
An Off-Axis Rotating Atom Trap, J. Wu, Frank Mosacatelli, E. Oh
An Off-Axis Rotating Atom Trap, J. Wu, Frank Mosacatelli, E. Oh
Physics & Astronomy Faculty Works
We present a novel configuration of a magneto-optical trap for cold atoms. The trap is very simple in design, employing only a small permanent magnet and an external Helmholtz bias coil. The trap's principal advantage is that the entire volume of the overlapping laser beams can be used for atom guiding and manipulation. An especially interesting effect is the rotation of the trapped atoms in circular motion as the permanent magnet is rotated. Clouds containing on the order of 2*10⁶ atoms are rotated up to 60Hz forming a 5 mm diameter ring. This rotation can potentially be used in studying …
What Do Children Want To Know About Animals And Artifacts? Domain-Specific Requests For Information, M. L. Greif, Deborah G. Kemler Nelson, F. C. Keil, F. Gutierrez
What Do Children Want To Know About Animals And Artifacts? Domain-Specific Requests For Information, M. L. Greif, Deborah G. Kemler Nelson, F. C. Keil, F. Gutierrez
Psychology Faculty Works
Children's questions may reveal a great deal about the characteristics of objects they consider to be conceptually important. Thirty-two preschool children were given opportunities to ask questions about unfamiliar artifacts and animals. The children asked ambiguous questions such as “What is it?” about artifacts and animals alike. However, they were more likely to ask about the functions of artifacts, but about category membership, food choices, and typical locations of animals. They never asked questions about either artifacts or animals that would be considered inappropriate by adults. The results indicate that children hold different expectations about the types of information important …
Fast High Resolution Echelle Spectroscopy Of A Laboratory Plasma, C. D. Cothran, Jerome Fung , '06, Michael R. Brown, M. J. Schaffer
Fast High Resolution Echelle Spectroscopy Of A Laboratory Plasma, C. D. Cothran, Jerome Fung , '06, Michael R. Brown, M. J. Schaffer
Physics & Astronomy Faculty Works
An echelle diffraction grating and a multianode photomultiplier tube are paired to construct a high resolution (R=lambda/delta lambda approximate to 2.5x10(4)) spectrograph with fast time response for use from the UV through the visible. This instrument has analyzed the line shape of C III impurity ion emission at 229.687 nm over the lifetime (approximate to 100 mu s) of the hydrogen plasmas produced at SSX. The ion temperature and line of sight average velocity are inferred from the observed thermal broadening and Doppler shift of the line. The time resolution of these measurements is about 1 mu s, sufficient to …
Wind Signatures In The X-Ray Emission-Line Profiles Of The Late-O Supergiant Zeta Orionis, David H. Cohen, M. A. Leutenegger, K. T. Grizzard, Catherine Lois Reed , '05, Roban Hultman Kramer , '03, S. P. Owocki
Wind Signatures In The X-Ray Emission-Line Profiles Of The Late-O Supergiant Zeta Orionis, David H. Cohen, M. A. Leutenegger, K. T. Grizzard, Catherine Lois Reed , '05, Roban Hultman Kramer , '03, S. P. Owocki
Physics & Astronomy Faculty Works
X-ray line-profile analysis has proved to be the most direct diagnostic of the kinematics and spatial distribution of the very hot plasma around O stars. The Doppler-broadened line profiles provide information about the velocity distribution of the hot plasma, while the wavelength-dependent attenuation across a line profile provides information about the absorption to the hot plasma, thus providing a strong constraint on its physical location. In this paper, we apply several analysis techniques to the emission lines in the Chandra High Energy Transmission Grating Spectrometer (HETGS) spectrum of the late-O supergiant zeta Ori (O9.7 Ib), including the fitting of a …
Two Fluid Effects On Three-Dimensional Reconnection In The Swarthmore Spheromak Experiment With Comparisons To Space Data, Michael R. Brown, C. D. Cothran, Jerome Fung , '06
Two Fluid Effects On Three-Dimensional Reconnection In The Swarthmore Spheromak Experiment With Comparisons To Space Data, Michael R. Brown, C. D. Cothran, Jerome Fung , '06
Physics & Astronomy Faculty Works
Several new experimental results are reported from spheromak merging studies at the Swarthmore SpheromakExperiment[M. R. Brown, Phys. Plasmas6, 1717 (1999)] with relevance to three-dimensional (3D) reconnection in laboratory and space plasmas. First, recent velocity measurements of impurity ions using ion Doppler spectroscopy are reported. Bidirectional outflow at nearly the Alfvén speed is clearly observed. Second, experimental measurements of the out-of-plane magnetic field in a reconnection volume showing a quadrupolar structure at the ion inertial scale are discussed. Third, a measurement of in-plane Hall electric field and nonideal terms of the generalized Ohm’s law in a reconnection volume of a weakly …
The Enigmatic Mr. William Penn: A Biographer’S Dilemma, J. William Frost
The Enigmatic Mr. William Penn: A Biographer’S Dilemma, J. William Frost
Library Staff Works
No abstract provided.
The End Of Preclearance As We Knew It: How The Supreme Court Transformed Section 5 Of The Voting Rights Act, P. Mccrary, C. Seaman, Richard M. Valelly , '75
The End Of Preclearance As We Knew It: How The Supreme Court Transformed Section 5 Of The Voting Rights Act, P. Mccrary, C. Seaman, Richard M. Valelly , '75
Political Science Faculty Works
No abstract provided.
Subjective And Objective Measures Of Governmental Regulations In Oecd Nations, G. Nicoletti, Frederic L. Pryor
Subjective And Objective Measures Of Governmental Regulations In Oecd Nations, G. Nicoletti, Frederic L. Pryor
Economics Faculty Works
Since government regulations may have an important impact on the macroeconomic performance of market economies, it is necessary to devise quantitative indicators of the regulatory regime, which raises some difficult methodological issues. After reviewing some of these problems, we compare the results of several recent quantitative studies of regulation in OECD nations, some based on an extensive review and quantification of laws and regulations, others based on observational data of those familiar with these regulations. Despite their very different methodologies and coverage of particular types of governmental regulation, the results of the three studies are significantly correlated, which suggests that …
Path Integral Monte Carlo Simulations Of Positronium Annihilation: From Micropores To Mesopores, Amy Lisa Graves, P. A. Sterne
Path Integral Monte Carlo Simulations Of Positronium Annihilation: From Micropores To Mesopores, Amy Lisa Graves, P. A. Sterne
Physics & Astronomy Faculty Works
Path integral Monte Carlo (PIMC) can reproduce the results of simple analytical calculations in which a single quantum particle is used to represent positronium within an idealized spherical pore. Our calculations improve on this approach by explicitly treating the positronium as a two-particle e(-), e(+) system interacting via the Coulomb interaction. We study the lifetime and the internal contact density, kappa, which controls the self-annihilation behavior for positronium in model spherical pores as a function of temperature and pore size. We compare the results with both PIMC and analytical calculations for a single-particle model.
Depression Prevention For Early Adolescent Girls: A Pilot Study Of All-Girls Versus Co-Ed Groups, T. M. Chaplin, Jane Gillham, K. Reivich, A. G.L. Elkon, B. Samuels, D. R. Freres, B. Winder, M. E.P. Seligman
Depression Prevention For Early Adolescent Girls: A Pilot Study Of All-Girls Versus Co-Ed Groups, T. M. Chaplin, Jane Gillham, K. Reivich, A. G.L. Elkon, B. Samuels, D. R. Freres, B. Winder, M. E.P. Seligman
Psychology Faculty Works
Given the dramatic increase in depression that occurs during early adolescence in girls, interventions must address the needs of girls. The authors examined whether a depression prevention program, the Penn Resiliency Program, was more effective for girls in all-girls groups than in co-ed groups. Within co-ed groups, the authors also tested whether there were greater effects for boys than for girls. Participants were 20811-to 14-year-olds. Girls were randomly assigned to all-girls groups, co-ed groups, or control. Boys were assigned to co-ed groups or control. Students completed questionnaires on depressive symptoms, hopelessness, and explanatory style before and after the intervention. Girls …
Reducing The Gender Gap In The Physics Classroom, M. Lorenzo, Catherine Hirshfeld Crouch, E. Mazur
Reducing The Gender Gap In The Physics Classroom, M. Lorenzo, Catherine Hirshfeld Crouch, E. Mazur
Physics & Astronomy Faculty Works
We investigate if the gender gap in conceptual understanding in an introductory university physics course can be reduced by using interactive engagement methods that promote in-class interaction, reduce competition, foster collaboration, and emphasize conceptual understanding. To this end we analyzed data from the introductory calculus-based physics course for non-majors at Harvard University taught traditionally or using different degrees of interactive engagement. Our results show that teaching with certain interactive strategies not only yields significantly increased understanding for both males and females, but also reduces the gender gap. In the most interactively taught courses, the pre-instruction gender gap was gone by …