Aerothermodynamic radiation studies

We have built and made operational a 6 in. electric arc driven shock tube which alloys us to study the non-equilibrium radiation and kinetics of low pressure (0.1 to 1 torr) gases processed by 6 to 12 km/s shock waves. The diagnostic system allows simultaneous monitoring of shock radiation temporal histories by a bank of up to six radiometers, and spectral histories with two optical multi-channel analyzers. A data set of eight shots was assembled, comprising shocks in N2 and air at pressures between 0.1 and 1 torr and velocities of 6 to 12 km/s. Spectrally resolved data was taken in both the non-equilibrium and equilibrium shock regions on all shots. The present data appear to be the first spectrally resolved shock radiation measurements in N2 performed at 12 km/s. The data base was partially analyzed with salient features identified

The pasta phase within density dependent hadronic models

In the present paper we investigate the onset of the pasta phase with different parametrisations of the density dependent hadronic model and compare the results with one of the usual parametrisation of the non-linear Walecka model. The influence of the scalar-isovector virtual delta meson is shown. At zero temperature two different methods are used, one based on coexistent phases and the other on the Thomas-Fermi approximation. At finite temperature only the coexistence phases method is used. npe matter with fixed proton fractions and in beta-equilibrium are studied. We compare our results with restrictions imposed on the the values of the density and pressure at the inner edge of the crust, obtained from observations of the Vela pulsar and recent isospin diffusion data from heavy-ion reactions, and with predictions from spinodal calculations.Comment: 15 pages, 11 figures and 7 table

Intrapartum sonography of fetal head in second stage of labor with neuraxial analgesia: a literature review and possible medicolegal aftermath

Intrapartum ultrasound (IU) is a valid support to obstetric management of fetal head progression in the second stage of labor in nulliparous with neuraxial labor analgesia (NLA). Nulliparous with NLA may have a prolonged the second stage of labor. The aim of this literature review was to evaluate the mode of delivery, as well as maternal and fetal morbidities associated with missed progression of fetal head detected with IU in the second stage of labor in nulliparous women with NLA.MATERIALS AND METHODS: The literature review was performed using PubMed, Cochrane, Medline, EMBASE, Scopus, Google Scholar and book chapters searches to identify relevant articles from 2001 to 2019, evaluating the mode of delivery and morbidities of the second stage of labor. Search terms used were “Intrapartum ultrasound”, “dystocia”, “prolonged labor”, “neuraxial analgesia”, “persistent occiput posterior position”, “asynclitism”, “second stage of labor”, “medico-legal aftermath”. Prolonged second stage was defined as three hours and more. Retrospective case series of women with prolonged second stage of labor with NLA were identified. The primary outcome was the incidence of operative vaginal delivery (OVD) and cesarean delivery (CS). RESULTS: The use of NLA may determine a prolonged second stage of labor (PSSL). IU when compared to the traditional vaginal digital examination (VDE) demonstrated the highest degree of diagnostic accuracy. CONCLUSIONS: The use of IU during NLA can aid in the diagnosis of fetal head progression, station or malposition and malrotation, alerts obstetrician on the possibility of dystocic labor, indicating to stop the drug administration in NLA and shift to OVD or CS. Extending the second stage of labor beyond current American College of Obstetricians and Gynecologists (ACOG) recommendations is beneficial. The ISUOG guidelines recommended the clinical application of IU to diagnose the persistent occiput posterior position (POPP) and asynclitism (A) in dystocic labor and produce photographic evidence of the case. Maternal and neonatal complications, medicolegal consequences and litigation can decrease if the IU device is used as good practice

Arcing in space structures in low Earth orbit

This report describes results of an experimental and theoretical program to investigate arcing of structures containing dielectric and conducting materials when they are biased negatively with respect to a plasma. An argon ion source generated Ar(+) ions of directed energy 20 to 40 eV and density approximately 10(exp 7) cm(exp -3) that impinged upon samples containing a dielectric material on top of a negatively biased Kovar plate. Arcing events were studied for bias voltages between -300 and -1000V with respect to the ion beam. The samples were Dow Corning 93-500 adhesive on Kovar, fused silica cover slips bonded on Kovar, and silicon solar cells mounted on Kovar. Measurements of discharge current, Kovar plate voltage, and radiation from the arc versus time were carried out. Microsecond duration exposure images and optical spectra in the 0.24 to 0.40 micron band were also acquired during arcing events. Arcing events were found to be associated with exposed adhesive and means were found to eliminate arcing altogether. The charging of a silica cover plate and the fields around the plate were calculated using a particle-in-cell code. Models were developed to explain the ignition of the arc and the physical processes occurring during the discharge

Exact computation for existence of a knot counterexample

[EN] Previously, numerical evidence was presented of a self-intersecting Bezier curve having the unknot for its control polygon. This numerical demonstration resolved open questions in scientic visualization, but did not provide a formal proof of self-intersection. An example with a formal existence proof is given, even while the exact self-intersection point remains undetermined.The authors acknowledge, with appreciation, the contributions of •D. Marsh, for software that generated experimental visualizations and related computations, •the reviewers, for singularly comprehensive and constructive comments,and •the editors, for their keen insight and informed perspective in selecting those reviewers.Marinelli, K.; Peters, TJ. (2019). Exact computation for existence of a knot counterexample. Applied General Topology. 20(1):251-264. https://doi.org/10.4995/agt.2019.10928SWORD251264201Cybergloves. http://www.cyberglovesystems.com/cyberglove-iii/ManusVR. https://manus-vr.com/Virtual motion labs. http://www.virtualmotionlabs.com/N. Amenta, T. J. Peters and A. C. Russell, Computational topology: Ambient isotopic approximation of 2-manifolds, Theoretical Computer Science 305 (2003), 3-15. https://doi.org/10.1016/s0304-3975(02)00691-6L. E. Andersson, S. M. Dorney, T. J. Peters and N. F. Stewart, Polyhedral perturbations that preserve topological form, CAGD 12, no. 8 (1995), 785-799. https://doi.org/10.1016/0167-8396(94)00039-7L. E. Andersson, T. J. Peters and N. F. Stewart, Selfintersection of composite curves and surfaces, CAGD 15 (1998), 507-527.M. A. Armstrong, Basic Topology, Springer, New York, 1983.R. H. Bing, The Geometric Topology of 3-Manifolds, American Mathematical Society, Providence, RI, 1983.J. Bisceglio, T. J. Peters, J. A. Roulier and C. H. Sequin, Unknots with highly knotted control polygons, CAGD 28, no. 3 (2011), 212-214. https://doi.org/10.1016/j.cagd.2011.01.001F. Chazal and D. Cohen-Steiner, A condition for isotopic approximation, Graphical Models 67, no. 5 (2005), 390-404. https://doi.org/10.1016/j.gmod.2005.01.005T. Culver, J. Keyser and D. Manocha, Exact computation of the medial axis of a polyhedron, Computer Aided Geometric Design 21, no. 1 (2004), 65-98. https://doi.org/10.1016/j.cagd.2003.07.008T. Etiene, L. G. Nonato, C. E. Scheidegger, J. Tierny, T.J. Peters, V. Pascucci, R. M.Kirby and C. T. Silva, Topology verification for isosurface extraction, IEEE Trans. Vis. Comput. Graph. 18, no. 6 (2012), 952-965. https://doi.org/10.1109/tvcg.2011.109G. E. Farin, Curves and Surfaces for Computer-Aided Geometric Design: A Practical Guide, Academic Press, Inc., 1996.J. D. Foley, A. van Dam, S. K. Feiner and J. F. Hughes, Computer Graphics: Principles and Practice (2Nd Ed.), Addison-Wesley Longman Publishing Co., Inc., Boston, MA,USA, 1990.D. Jiang and N. F. Stewart, Backward error analysis in computational geometry, Springer Berlin Heidelberg, Berlin, Heidelberg, 2006, pp.50-59.K. E. Jordan, J. Li, T. J. Peters and J. A. Roulier, Isotopic equivalence from Bézier curve subdivision for application to high performance computing, CAGD 31 (2014), 642-655. https://doi.org/10.1016/j.cagd.2014.07.002K. E. Jordan, L. E. Miller, E. L. F. Moore, T. J. Peters and A. Russell, Modeling time and topology for animation and visualization with examples on parametric geometry, Theoretical Computer Science 405 (2008), 41-49. https://doi.org/10.1016/j.tcs.2008.06.023L. Kettner, K. Mehlhorn, S. Pion, S. Schirra and C. Yap, Classroom examples of robustness problems in geometric computations, Computational Geometry 40, no. 1 (2008),61-78. https://doi.org/10.1016/j.comgeo.2007.06.003R. M. Kirby and C. T. Silva, The need for verifiable visualization, IEEE Computer Graphics and Applications September/October (2008), 1-9.J. M. Lane and R. F. Riesenfeld, A theoretical development for the computer generation and display of piecewise polynomial surfaces, IEEE, PAMI-2no. 1, January 1980.J. Li and T. J. Peters, Isotopic convergence theorem, Journal of Knot Theory and Its Ramifications 22, no. 3 (2013). https://doi.org/10.1142/s0218216513500120J. Li, T. J. Peters, D. Marsh and K. E. Jordan, Computational topology counter examples with 3D visualization of Bézier curves, Applied General Topology 13, no. 2 (2012), 115-134. https://doi.org/10.4995/agt.2012.1624G. McGill, Molecular movies coming to a lecture near you, Cell 133, no. 7 (2008), 1127-1132. https://doi.org/10.1016/j.cell.2008.06.013J. Munkres, Topology, Prentice Hall, 2nd edition, 1999.M. Neagu, E. Calcoen and B. Lacolle, Bézier curves: topological convergence of the control polygon, 6th Int. Conf. on Mathematical Methods for Curves and Surfaces, Vanderbilt (2000), pp. 347-354.J. Peters and X. Wu, On the optimality of piecewise linear max-norm enclosures based on SLEFES, International Conference on Curves and Surfaces, Saint-Malo, France, 2002.L. Piegl and W. Tiller, The NURBS Book, Springer, New York, 1997.C. H. Sequin, Spline knots and their control polygons with differing knottedness, http://www.eecs.berkeley.edu/Pubs/TechRpts/2009/EECS-2009-152.htmlM. Wertheim and K. Millett, Where the wild things are: An interview with Ken Millett, Cabinet 20, 2006

Transport Phenomena at a Critical Point -- Thermal Conduction in the Creutz Cellular Automaton --

Nature of energy transport around a critical point is studied in the Creutz cellular automaton. Fourier heat law is confirmed to hold in this model by a direct measurement of heat flow under a temperature gradient. The thermal conductivity is carefully investigated near the phase transition by the use of the Kubo formula. As the result, the thermal conductivity is found to take a finite value at the critical point contrary to some previous works. Equal-time correlation of the heat flow is also analyzed by a mean-field type approximation to investigate the temperature dependence of thermal conductivity. A variant of the Creutz cellular automaton called the Q2R is also investigated and similar results are obtained.Comment: 27 pages including 14figure

Discovery of molecular subtypes in leiomyosarcoma through integrative molecular profiling.

Leiomyosarcoma (LMS) is a soft tissue tumor with a significant degree of morphologic and molecular heterogeneity. We used integrative molecular profiling to discover and characterize molecular subtypes of LMS. Gene expression profiling was performed on 51 LMS samples. Unsupervised clustering showed three reproducible LMS clusters. Array comparative genomic hybridization (aCGH) was performed on 20 LMS samples and showed that the molecular subtypes defined by gene expression showed distinct genomic changes. Tumors from the muscle-enriched cluster showed significantly increased copy number changes (P=0.04). A majority of the muscle-enriched cases showed loss at 16q24, which contains Fanconi anemia, complementation group A, known to have an important role in DNA repair, and loss at 1p36, which contains PRDM16, of which loss promotes muscle differentiation. Immunohistochemistry (IHC) was performed on LMS tissue microarrays (n=377) for five markers with high levels of messenger RNA in the muscle-enriched cluster (ACTG2, CASQ2, SLMAP, CFL2 and MYLK) and showed significantly correlated expression of the five proteins (all pairwise P<0.005). Expression of the five markers was associated with improved disease-specific survival in a multivariate Cox regression analysis (P<0.04). In this analysis that combined gene expression profiling, aCGH and IHC, we characterized distinct molecular LMS subtypes, provided insight into their pathogenesis, and identified prognostic biomarkers