An Introduction To Bach Studies

This volume is a guide to the resources and materials of Bach scholarship, both for the nonspecialist wondering where to begin in the enormous literature on J. S. Bach, and for the Bach specialist looking for a convenient and up-to-date survey of the field. It describes the tools of Bach research and how to use them, and suggests how to get started in Bach research by describing the principal areas of research and citing the essential literature on each piece and topic. The authors emphasize the issues that have engaged Bach scholars for generations, focusing on particularly important writings on recent literature on overviews, collections of essays and handbooks and on writings in English. Subjects covered include bibliographic tools of Bach research and sources of literature Bach\u27s family Bach biographies places Bach lived and worked Bach\u27s teaching the liturgy Bach source studies and the transmission of his music repertory and editions genres and individual vocal and instrumental works performance practice the reception and analysis of Bach\u27s music and many others. The book also offers explanations of important and potentially confusing topics in Bach research, such as the organization of the annual cantata cycles, pitch standards, the history of the Berlin libraries, the structure of the critical commentary volumes in the Neue Bach-Ausgabe, and so on. This book opens up the rich world of Bach scholarship to students, teachers, performers, and listener

Theory and Simulations of Refractive Substructure in Resolved Scatter-Broadened Images

At radio wavelengths, scattering in the interstellar medium distorts the appearance of astronomical sources. Averaged over a scattering ensemble, the result is a blurred image of the source. However, Narayan & Goodman (1989) and Goodman & Narayan (1989) showed that for an incomplete average, scattering introduces refractive substructure in the image of a point source that is both persistent and wideband. We show that this substructure is quenched but not smoothed by an extended source. As a result, when the scatter-broadening is comparable to or exceeds the unscattered source size, the scattering can introduce spurious compact features into images. In addition, we derive efficient strategies to numerically compute realistic scattered images, and we present characteristic examples from simulations. Our results show that refractive substructure is an important consideration for ongoing missions at the highest angular resolutions, and we discuss specific implications for RadioAstron and the Event Horizon Telescope.Comment: Equation numbering in appendix now matches published version. Two minor typos correcte

Stronger Partnerships for Safer Food: An Agenda for Strengthening State and Local Roles in the Nation's Food Safety System

Examines federal, state, and local agencies' responsibilities, strengths, and weaknesses in ensuring food safety. Recommends systemwide reforms to enhance state and local roles and improve surveillance, outbreak response, and regulation and inspection

SSX MHD Plasma Wind Tunnel

A new turbulent plasma source at the Swarthmore Spheromak Experiment (SSX) facility is described. The MHD wind tunnel configuration employs a magnetized plasma gun to inject high-beta plasma into a large, well-instrumented, vacuum drift region. This provides unique laboratory conditions approaching that in the solar wind: there is no applied background magnetic field in the drift region and has no net axial magnetic flux; the plasma flow speed is on the order of the local sound speed (M ~ 1), so flow energy density is comparable to thermal energy density; and the ratio of thermal to magnetic pressure is of order unity (plasma β ~ 1) so thermal energy density is also comparable to magnetic energy density. Results presented here and referenced within demonstrate the new capabilities and show how the new platform is proving useful for fundamental plasma turbulence studies

Statistically optimal analysis of samples from multiple equilibrium states

We present a new estimator for computing free energy differences and thermodynamic expectations as well as their uncertainties from samples obtained from multiple equilibrium states via either simulation or experiment. The estimator, which we term the multistate Bennett acceptance ratio (MBAR) estimator because it reduces to the Bennett acceptance ratio when only two states are considered, has significant advantages over multiple histogram reweighting methods for combining data from multiple states. It does not require the sampled energy range to be discretized to produce histograms, eliminating bias due to energy binning and significantly reducing the time complexity of computing a solution to the estimating equations in many cases. Additionally, an estimate of the statistical uncertainty is provided for all estimated quantities. In the large sample limit, MBAR is unbiased and has the lowest variance of any known estimator for making use of equilibrium data collected from multiple states. We illustrate this method by producing a highly precise estimate of the potential of mean force for a DNA hairpin system, combining data from multiple optical tweezer measurements under constant force bias.Comment: 13 pages (including appendices), 1 figure, LaTe

Horticultural Studies 1999

Horticultural Studies 1999 is the second edition of a Research Series dedicated to horticultural programs in the University of Arkansas Division of Agriculture and the Dale Bumpers College of Agricultural, Food and Life Sciences. This publication summarizes research, extension, and educational activities that serve horticultural industries and interest groups in Arkansas. The goals of this publication are to provide relevant information to the growers and end-users of horticulture crops in Arkansas and to inform the citizens of Arkansas and the surrounding region of activities related to horticulture

An international collaboration for the development of a research training course in an emergent academic discipline

Proceedings of INTED2010 Conference. 8-10 March 2010, Valencia, Spain.In professional areas such as the creative and performing arts and design, the academic model of research has not been clearly articulated. This means that often the values held in advanced professional practice run counter to the traditional models of knowledge and research that are adopted in academia. As a result, there is a problem in accounting for research in these areas in ways that will be recognised and valued by both communities. There is an ongoing debate about the best way of dealing with and reflecting these professional values in academic research. This debate has substantiated an emergent type of research that is called ‘Practice-based Research’ (PbR). PbR introduces the claim that creative practice has an instrumental role in academic research in areas such as design and urban planning. This role is different from the one of experimentation in traditional empirical research, and different from the one of practice in professional creative practice. This paper describes the development and delivery of a research methods training course in the department of spatial planning and design (Stedenbouw) at the Technical University Delft (TU Delft, Netherlands) that engages directly with these fundamental problems. The course, Research and Design Methods, has served as a testing ground for many ideas stemming from the cooperation between TU Delft and the University of Hertfordshire (UH, UK). As part of the international knowledge transfer initiative, a member of staff from TU Delft has been working at the UH for a year. One of the outcomes of this collaboration is the design and delivery of a new course at TU Delft, which tackles the relationship between academic research and planning and design, through a dialogue between different views on the activities of the urban planner and the designer. There are challenges that arise when structuring a course within an area for which the epistemological, ontological and methodological questions are still under discussion by the community. The broad aim was to offer insight into non-traditional academic research tools and methods for different areas of urban design and planning within a broader academic context. This included the analysis of different academic traditions that were relevant for urban planning and design. We define research as a systematic investigation of a subject that leads to the production of explicit knowledge, and adds to the existing body of knowledge about the subject. In the paper, we analyse the way in which research and practice are problematized in the TU Delft course and claim that PbR manifests the differences between the worldviews of academic research and professional practice, with their different aims and values. As a result, training and expertise in the professional values of creative practice is insufficient for academic research. There is therefore a need for specific research training that addresses these differences. This need for discipline specific research training has been recognized in the Bologna Process and the TU Delft course represents one such training programme.otherPeer reviewe

New High Proper Motion Stars from the Digitized Sky Survey. II. Northern Stars with 0.5<mu<2.0 arcsec/yr at High Galactic Latitudes

In a continuation of our systematic search for high proper motion stars in the Digitized Sky Survey, we have completed the analysis of northern sky fields at galactic latitudes above 25 degrees. With the help of our SUPERBLINK software, a powerful automated blink comparator developed by us, we have identified 1146 stars in the magnitude range 8<r<20 with proper motions 0.500<mu<2.000 arcsec/yr. These include 1080 stars previously listed in Luyten's proper motion catalogs (LHS, NLTT), 9 stars not previously listed in the Luyten catalogs but reported elsewhere in the literature (including 1 previously reported by our team), and 57 new objects reported here for the first time. This paper includes a list of positions, proper motions, magnitudes, and finder charts for all the new high proper motion stars. Combined with our previous study of low galactic latitude fields (see Paper I), our survey now covers over 98% of the northern sky. We conclude that the Luyten catalogs were 90% complete in the northern sky for stars with 0.5<mu<2.0 arcsec/yr down to magnitude r=19. We discuss the incompleteness of the old Luyten proper motion survey, and estimate completeness limits for our new survey.Comment: To appear in The Astronomical Journa