12,322 research outputs found
Visualisation of quantum evolution in the Stern–Gerlach and Rabi experiments
No full textThe Stern–Gerlach experiment is a seminal experiment in quantum physics, involving the interaction between a particle with spin and an applied magnetic field gradient. A recent article [Wennerström et al., Phys. Chem. Chem. Phys., 2012, 14, 1677–1684] claimed that a full understanding of the Stern–Gerlach experiment can only be attained if transverse spin relaxation is taken into account, generated by fluctuating magnetic fields originating in the magnetic materials which generate the field gradient. This interpretation is contrary to the standard quantum description of the Stern–Gerlach experiment, which requires no dissipative effects. We present simulations of conventional quantum dynamics in the Stern–Gerlach experiment, using extended Wigner functions to describe the propagation of the quantum state in space and time. No relaxation effects are required to reproduce the qualitative experimental behaviour. We also present simulations of quantum dynamics in the Rabi experiment, in which an applied radiofrequency field induces spin transitions in the particle wave
A sequence related to the Stern sequence
No full textIn this dissertation we define and study a two-parameter family of recursive sequences which we call the bow sequences. The general bow sequence is defined similarly to the Stern sequence, and many of the properties of the bow sequences are related to known properties of the Stern sequence. In particular, we derive the generating function for the general bow sequence, and give interpretations of the generating function for two basic cases. We also determine properties of the bow sequences modulo 2 and 3, and give conjectures for the behavior of the bow sequences modulo d for d
≥4. Finally, we discuss ideas for future research.Item withdrawn by Mark Zulauf ([email protected]) on 2010-06-23T23:00:52Z
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Cost-Benefit Analysis of Climate Change: Stern Revisited
No full textThis paper explores the challenges facing orthodox economic approaches to assessing climate control as if it were appraisal of an investment project. Serious flaws are noted in the work of economists with especial attention to the UK Government report by Stern and colleagues. The opinions expressed in this paper are those of the authors and may not be taken to reflect the views CSIRO or the Australian Government.enhanced greenhouse effect, global CBA, Stern Report
Replication and robustness analysis of ‘Energy and economic growth in the USA: a multivariate approach’
No full textWe replicate Stern (1993, Energy Economics), who argues and empirically demonstrates that it is necessary (i) to use quality-adjusted energy use and (ii) to include capital and labor as control variables in order to find Granger causality from energy use to GDP. Though we could not access the original dataset, we can verify the main original inferences using data that are as close as possible to the original. We analyze the robustness of the original findings to an alternative estimation approach, alternative definitions of variables, and alternative model specifications for both the (almost) original time span (1949-1990) and an extended time span (1949-2015). p-values tend to be substantially smaller if energy use is quality adjusted rather than measured by total joules and if capital is included. Including labor has mixed results. These findings tend to largely support Stern’s (1993) two main conclusions and emphasize the importance of accounting for changes in the energy mix in time series modeling of the energy-GDP relationship and controlling for other factors of production. We also discuss how the inclusion of the original author in designing the replication study using a pre-analysis plan can help to counterbalance the incentive of replicating authors to disconfirm major findings of the original article to increase the probability of getting published.ARC DP16010075
Reuben Fox-Trot. Society's Latest Dance.
No full textsectionalpianoads on back cover for Jos. W. Stern & Co. stock7842-4Johns Hopkins University, Levy Sheet Music Collection, Box
172, Item 080by Ed. B. Claypoole. Arr. by D. Onivas.[Miss Sonia Baraban and Charles C. Grohs]photo by Apeda, N.Y., by Miss Sonia Baraban and Charles C. Groh
Reuben Fox-Trot. Society's Latest Dance.
No full textsectionalpianoads on back cover for Jos. W. Stern & Co. stock7842-4Johns Hopkins University, Levy Sheet Music Collection, Box
172, Item 080by Ed. B. Claypoole. Arr. by D. Onivas.[Miss Sonia Baraban and Charles C. Grohs]photo by Apeda, N.Y., by Miss Sonia Baraban and Charles C. Groh
Crystal structure of NS-134 in complex with bovine cathepsin B: a two-headed epoxysuccinyl inhibitor extends along the entire active-site cleft
No full textStern I, Schaschke N, Moroder L, Turk D. Crystal structure of NS-134 in complex with bovine cathepsin B: a two-headed epoxysuccinyl inhibitor extends along the entire active-site cleft. BIOCHEMICAL JOURNAL. 2004;381(2):511-517
Annual World Bank Conference on Development Economics 2003 : The New Reform Agenda
No full textThe Annual World Bank Conference on
Development Economics seeks to expand the flow of ideas
among development policy researchers, academics, and
practitioners from around the world. It is a premier forum
for World Bank and other experts to exchange ideas,
challenge one another's findings, and expand
theoretical and practical knowledge of development. Each
year the topics selected for the conference represent new
matters of concern or areas that will benefit from a review
of what we know and from the identification of what still
needs to be explored and expanded. This year's
conference, held at the World Bank on April 29-30, 2002,
addressed four themes: trade and poverty, Africa's
future in terms of industrial and/or agricultural
development, education and empowerment, and investment
climate and productivity, with Andrew Berg and Anne Krueger,
Paul Collier, Simeon Djankov, Rafael La Porta, Florencio
Lopez-De-Silanes, and Andrei Schleifer, Ravi Kanbur, Carmen
M. Reinhart and Kenneth S. Rogoff, L. Alan Winters, and
Adrian Wood. World Bank President James D. wolfensohn, Chief
Economist Nicholas Stern, and John B. Taylor also addressed
the conference
New Dimensions in Ecological Economics: Integrated Approaches to People and Nature
No full textDrawing on the biophysical sciences, public policy, geography, economics, exploratory research and the behavioural sciences, this book offers reviews and prescriptions for the future of ecological economics, placing particular emphasis on complex sustainability problems.Stephen Dovers, David I. Stern and Michael D. Young1. Ecological economics: prospects for integration and interdisciplinarity / Stephen Dovers, David I. Stern, Michael D. Young -- Pt. I. First Dimension: Challenges and Reviews. 2. Research challenges in the twenty-first century / John Proops -- 3. Passion and ecological economics: towards a richer coevolution of value systems and environmental systems / Richard B. Norgaard -- 4. Beyond disciplines: exploring exploratory research as a framework for integration / Lorrae van Kerkhoff -- Pt. II. Second Dimension: Reorientations and Openings. 5. Sustainability and interdisciplinarity / Jon Barnett, Heidi Ellemor and Stephen Dovers -- 6. Environmental, ecological and behavioural economics / Jack L. Knetsh -- 7. Economic psychology and ecological economics / Stephen E.G. Lea -- 8. A policy orientation as integrative strategy / Stephen Dovers -- Pt. III. Third Dimension: Frameworks and Applications. 9. Towards an ecological-economic theory of nature policy / M. van der Heide, J.C.J.M. van den Bergh and E.C. van Ierland -- 10. Modelling stochastic technological change in economy and environment using the Kalman filter / David I. Stern -- 11. Effective policy and interventions in environmental systems using material budgets / Robert J. Wasson -- 12. Expanding the concept of flows and developing frameworks for linking social, economic and environmental accounting systems: two approaches for integration / Sasha Courville
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