Quantitative calculations of the excitonic energy spectra of semiconducting single-walled carbon nanotubes within a π\pi-electron model

Using Coulomb correlation parameters appropriate for $\pi$-conjugated polymers (PCPs), and a nearest neighbor hopping integral that is arrived at by fitting the energy spectra of three zigzag semiconducting single-walled carbon nanotubes (S-SWCNTs), we are able to determine quantitatively the exciton energies and exciton binding energies of 29 S-SWCNTs within a semiempirical $\pi$-electron Hamiltonian that has been widely used for PCPs. Our work establishes the existence of a deep and fundamental relationship between PCPs and S-SWCNTs.Comment: 6 pages, 2 figures, 2 table

Negative vacuum energy densities and the causal diamond measure

Arguably a major success of the landscape picture is the prediction of a small, non-zero vacuum energy density. The details of this prediction depends in part on how the diverging spacetime volume of the multiverse is regulated, a question that remains unresolved. One proposal, the causal diamond measure, has demonstrated many phenomenological successes, including predicting a distribution of positive vacuum energy densities in good agreement with observation. In the string landscape, however, the vacuum energy density is expected to take positive and negative values. We find the causal diamond measure gives a poor fit to observation in such a landscape -- in particular, 99.6% of observers in galaxies seemingly just like ours measure a vacuum energy density smaller than we do, most of them measuring it to be negative.Comment: 9 pages, 3 figures; v2: minor error fixed (results essentially unchanged), reference added; v3: published version, includes a few clarification

Follow-up analysis of federal process of care data reported from three acute care hospitals in rural Appalachia

BACKGROUND: This investigation evaluated standardized process of care data collected on selected hospitals serving a remote rural section of westernmost North Carolina. METHODS: Centers for Medicare and Medicaid Services data were analyzed retrospectively for multiple clinical parameters at Fannin Regional Hospital, Murphy Medical Center, and Union General Hospital. Data were analyzed by paired t-test for individual comparisons among the three study hospitals to compare the three facilities with each other, as well as with state and national average for each parameter. RESULTS: Centers for Medicare and Medicaid Services "Hospital Compare" data from 2011 showed Fannin Regional Hospital to have significantly higher composite scores on standardized clinical process of care measures relative to the national average, compared with Murphy Medical Center (P = 0.01) and Union General Hospital (P = 0.01). This difference was noted to persist when Fannin Regional Hospital was compared with Union General Hospital using common state reference data (P = 0.02). When compared with national averages, mean process of care scores reported from Murphy Medical Center and Union General Hospital were both lower but not significantly different (-3.44 versus -6.07, respectively, P = 0.54). CONCLUSION: The range of process of care scores submitted by acute care hospitals in western North Carolina is considerable. Centers for Medicare and Medicaid Services "Hospital Compare" information suggests that process of care measurements at Fannin Regional Hospital are significantly higher than at either Murphy Medical Center or Union General Hospital, relative to state and national benchmarks. Further investigation is needed to determine what impact these differences in process of care may have on hospital volume and/or market share in this region. Additional research is planned to identify process of care trends in this demographic and geographically rural area

Alpha particle thermodynamics in the inner heliosphere fast solar wind

Context. Plasma processes occurring in the corona and solar wind can be probed by studying the thermodynamic properties of different ion species. However, most in-situ observations of positive ions in the solar wind are taken at 1 AU, where information on their solar source properties may have been irreversibly erased. Aims. In this study we aimed to use the properties of alpha particles at heliocentric distances between 0.3 and 1 AU to study plasma processes occurring at the points of observation, and to infer processes occurring inside 0.3 AU by comparing our results to previous remote sensing observations of the plasma closer to the Sun. Methods. We reprocessed the original Helios positive ion distribution functions, isolated the alpha particle population, and computed the alpha particle number density, velocity, and magnetic field perpendicular and parallel temperatures. We then investigated the radial variation of alpha particle temperatures in fast solar wind observed between 0.3 and 1 AU. Results. Between 0.3 and 1 AU alpha particles are heated in the magnetic field perpendicular direction, and cooled in the magnetic field parallel direction. Alpha particle evolution is bounded by the alpha firehose instability threshold, which provides one possible mechanism to explain the observed parallel cooling and perpendicular heating. Closer to the Sun our observations suggest that the alpha particles undergo heating in the perpendicular direction, whilst the large magnetic field parallel temperatures observed at 0.3 AU may be due to the combined effect of double adiabatic expansion and alpha particle deceleration inside 0.3 AU

A comparative study of high-field diamagnetic fluctuations in deoxygenated YBa2Cu3O(7-x) and polycrystalline (Bi-Pb)2Sr2Ca3O(10)

We studied three single crystals of YBa2Cu3O{7-x} with Tc= 62.5, 52, and 41 K, and a textured specimen of (Bi-Pb)2Sr2Ca2Cu3O10 with Tc=108 K, for H//c axis. The reversible data were interpreted in terms of 2D lowest-Landau-level fluctuation theory. The data were fit well by the 2D LLL expression for magnetization obtained by Tesanovic etal., producing reasonable values of kappa but larger values of dHc2/dT. Universality was studied by obtaining a simultaneous scaling of Y123 data and Bi2223. An expression for the 2D x-axis LLL scaling factor used to obtain the simultaneous scaling was extracted from theory, and compared with the experimental values. The comparison between the values of the x-axis produced a deviation of 40% which suggests that the hypothesis of universality of the 2D-LLL fluctuations is not supported by the studied samples. We finaly observe that Y123 magnetization data for temperatures above $T_c$ obbey a universal scaling obtained for the diamagnetic fluctuation magnetization from a theory considering non-local field effects. The same scaling was not obbeyed by the corresponding magnetization calculated from the two-dimensional lowest-Landau-level theory.Comment: 7 pages 5 figures, accept in Journ. Low Temp. Phy

Analisis Penulisan Resensi Artikel Siswa Kelas XII IPA 2 Sman 9 Pontianak Tahun Pelajaran 2015/2016

Penelitian ini bertujuan mendeskripsikan penulisan resensi pada siswa kelas XII IPA 2 SMA Negeri 9 Pontianak tahun pelajaran 2015/2016. Metode yang digunakan adalah deskriptif dengan bentuk penelitian kualitatif. Sumber datanya adalah siswa kelas XII IPA 2 SMAN 9 Pontianak tahun pelajaran 2015/2016 yang berjumlah 25 siswa. Datanya adalah semua kata, frasa, dan kalimat yang terdapat dalam penulisan resensi siswa kelas XII IPA 2 SMAN 9 Pontianak tahun pelajaran 2015/2016. Hasil analisis (1) penggunaan sitematika resensi tergolong kurang baik dengan persentase 49%; (2) penulisan isi artikel tergolong kurang baik dengan persentase 57,6%; hasil belajar siswa menulis resensi tidak mencapai ketuntasan. (3) penggunaan ejaan yang disempurnakan tergolong sangat baik dengan persentase 89,68%; (4) penggunaan diksi tergolong sangat baik dengan persentase 91,45%; dan (5) penggunaan kalimat efektif tergolong cukup baik dengan persentase 70,24%. Kata kunci: analisis, penulisan, resensi, artikel Abstrack: This research aims to describe process of writing book review in SMA Negeri 9 Pontianak, class XII IPA 2, academic year 2015/2016. The method used in this research is descriptive method with a form of qualitative research. The data in this words, phrases, and sentences contained in the process of writing book review in SMA Negeri 9 Pontianak, class XII IPA 2, academic year 2015/2016. The result the analysis process of writing book review (1) The use of systematic in writing book review is categorized as not really good, with the precentage 47 %, (2) The writing article which was being reviewcd is categorized as good enogh, with the precentage 57,6%, the result of students' writing in reviewing book is not reach the standard score, (3) The use of Indonesian right spelling is categorized as very good, with the precentage 89,68%, (4) The use of diction is categorized as very good, with the precentage 91,45%, and (5) The effective sentences' USAge is categorized as good enough, with the precentage 70,24%