PWA of 3pi Final States and a Search for the pi1(1600)

Partial wave analyses (PWA) of the 3pi systems in the reactions pi- p --> pi+ pi- pi- p (the ``charged'' mode) and pi- p --> pi- pi0 pi0 p (the ``neutral'' mode) with an 18.3 GeV/c pion beam were performed using high statistics data from the E852 experiment. Conventional signals, such as the a1(1260), the a2(1320), and the pi2(1670), were found to be remarkably stable to the choice of waves included in the fit. In contrast, possible evidence for the pi1(1600) in the JPC = 1-+ exotic wave amplitude disappears when additional decay modes of conventional mesons (especially those of the pi2(1670)) are included in the PWA fit.Comment: Hadron05 Proceedings, 5 pages, 4 figure

NASA's Advanced solid rocket motor

The Advanced Solid Rocket Motor (ASRM) will not only bring increased safety, reliability and performance for the Space Shuttle Booster, it will enhance overall Shuttle safety by effectively eliminating 174 failure points in the Space Shuttle Main Engine throttling system and by reducing the exposure time to aborts due to main engine loss or shutdown. In some missions, the vulnerability time to Return-to-Launch Site aborts is halved. The ASRM uses case joints which will close or remain static under the effects of motor ignition and pressurization. The case itself is constructed of the weldable steel alloy HP 9-4-0.30, having very high strength and with superior fracture toughness and stress corrosion resistance. The internal insulation is strip-wound and is free of asbestos. The nozzle employs light weight ablative parts and is some 5,000 pounds lighter than the Shuttle motor used to date. The payload performance of the ASRM-powered Shuttle is 12,000 pounds higher than that provided by the present motor. This is of particular benefit for payloads delivered to higher inclinations and/or altitudes. The ASRM facility uses state-of-the-art manufacturing techniques, including continuous propellant mixing and direct casting

Different ways of seeing: the language games of mothering

My thesis is original in placing together Wittgenstein’s ideas of how language works, and arguments for the philosophical significance of the embodied and relational figure of the mother. I both use and resist a Wittgensteinian therapy to overcome the problem of the forgetting of the mother in philosophy. I begin with the problem of essentialism, important to Wittgenstein and to feminist philosophy. My reading of Wittgenstein finds an ignored lacuna between language and (female) experience. I add in to the debate the type specimen approach from botany. Adopting this approach enables me to avoid a classification which requires a true inner essence to mothering, and provides a way for me to denote the significant place of the language games of mothering in language games about women. I argue for a different symbol of the mother. I agree with Wittgenstein’s account of language, but add to it. I show the importance of Wittgenstein’s insight that although meaning is not fixed independently of use, use does not fix meaning in that I create new meanings for the figure of the mother. I argue, through an exploration of Wittgenstein’s concept of ‘übersichtlichen Darstellung’, that Wittgenstein can help us to see the phenomena of our life differently, in a way that makes space for understanding female difference. His concept of a form of life provides such openings. As the Wittgensteinian agent seems distinctly un-female, I bring in the philosophy of Kierkegaard in my argument for a different relational self as mother. I argue for a Kierkegaardian flexible maternal self with mobile edges. I insert the language games of the mother into Kierkegaard’s writing on women. My aim is a more adequate representation of a (true) reality. I use the work of John Wisdom to make a bridge between Wittgenstein and the narrative form, which I use throughout. Wisdom’s strategy is to engage in unconventional reflection in looking for new ways of telling philosophical stories, and in finding new patterns of meaning in the familiar. I claim that the narrative form enables me to express the shifting essence of the mother and the diversity of mothers; and to acknowledge the silences which are part of the mother’s story. My aim in this thesis is creative. I use Wittgenstein to create a new kind of relation to philosophy. I do not offer a correct reading of Wittgenstein or Kierkegaard. Instead, aided by the insights provided by feminist philosophy, I write in the language games of the mother to their ideas. Thus, I bring into existence through utterance a different, feminist philosophical symbol of the mother

Development and application of a particle-particle particle-mesh Ewald method for dispersion interactions

For inhomogeneous systems with interfaces, the inclusion of long-range dispersion interactions is necessary to achieve consistency between molecular simulation calculations and experimental results. For accurate and efficient incorporation of these contributions, we have implemented a particle-particle particle-mesh (PPPM) Ewald solver for dispersion ($r^{-6}$) interactions into the LAMMPS molecular dynamics package. We demonstrate that the solver's $\mathcal{O}(N\log N)$ scaling behavior allows its application to large-scale simulations. We carefully determine a set of parameters for the solver that provides accurate results and efficient computation. We perform a series of simulations with Lennard-Jones particles, SPC/E water, and hexane to show that with our choice of parameters the dependence of physical results on the chosen cutoff radius is removed. Physical results and computation time of these simulations are compared to results obtained using either a plain cutoff or a traditional Ewald sum for dispersion.Comment: 31 pages, 9 figure

Comparison of high-resolution solar irradiance spectra and the solar luminosity in the period 1980-1989

In this research, we aim to determine to what extent the solar irradiance changes measured through the 1980's from orbiting vehicles are accompanied by spectroscopic irradiance changes observable from the ground. We describe fractional changes in line absorption as 'blanketing'. In section 2, we briefly review results obtained in an earlier project and which have been published. Section 3 describes the data of this investigation; section 4 describes the data reduction; section 5 describes the observational results in terms of blanketing; and section 6 describes the interpretation of the measured changes. Section 7 contains an outline of possible uses for Doppler-shift data that emerges with the measurements of the blanketing variations. Section 8 is an outline for future research suggested by our results in this project

Computer program determines thermal environment and temperature history of lunar orbiting space vehicles

Program computes the thermal environment of a spacecraft in a lunar orbit. The quantities determined include the incident flux /solar and lunar emitted radiation/, total radiation absorbed by a surface, and the resulting surface temperature as a function of time and orbital position

NLTE 1.5D Modeling of Red Giant Stars

Spectra for 2D stars in the 1.5D approximation are created from synthetic spectra of 1D non-local thermodynamic equilibrium (NLTE) spherical model atmospheres produced by the PHOENIX code. The 1.5D stars have the spatially averaged Rayleigh-Jeans flux of a K3-4 III star, while varying the temperature difference between the two 1D component models ($\Delta T_{\mathrm{1.5D}}$), and the relative surface area covered. Synthetic observable quantities from the 1.5D stars are fitted with quantities from NLTE and local thermodynamic equilibrium (LTE) 1D models to assess the errors in inferred $T_{\mathrm{eff}}$ values from assuming horizontal homogeneity and LTE. Five different quantities are fit to determine the $T_{\mathrm{eff}}$ of the 1.5D stars: UBVRI photometric colors, absolute surface flux SEDs, relative SEDs, continuum normalized spectra, and TiO band profiles. In all cases except the TiO band profiles, the inferred $T_{\mathrm{eff}}$ value increases with increasing $\Delta T_{\mathrm{1.5D}}$. In all cases, the inferred $T_{\mathrm{eff}}$ value from fitting 1D LTE quantities is higher than from fitting 1D NLTE quantities and is approximately constant as a function of $\Delta T_{\mathrm{1.5D}}$ within each case. The difference between LTE and NLTE for the TiO bands is caused indirectly by the NLTE temperature structure of the upper atmosphere, as the bands are computed in LTE. We conclude that the difference between $T_{\mathrm{eff}}$ values derived from NLTE and LTE modelling is relatively insensitive to the degree of the horizontal inhomogeneity of the star being modeled, and largely depends on the observable quantity being fit.Comment: 46 pages, 14 figures, 7 tables, accepted for publication in ApJ on April 5, 201