Observations of Diffuse EUV Emission with the Cosmic Hot Interstellar Plasma Spectrometer (CHIPS)

The Cosmic Hot Interstellar Plasma Spectrometer (CHIPS) was designed to study diffuse emission from hot gas in the local interstellar cavity in the wavelength range 90 - 265 A. Between launch in January 2003 and early 2004, the instrument was operated in narrow-slit mode, achieving a peak spectral resolution of about 1.4 A FWHM. Observations were carried out preferentially at high galactic latitudes; weighted by observing time, the mean absolute value of the galactic latitude for all narrow-slit observations combined is about 45 degrees. The total integration time is about 13.2 Msec (74% day, 26% night). In the context of a standard collisional ionization equilibrium plasma model, the CHIPS data set tight constraints on the emission measure at temperatures between 10^{5.55} K and 10^{6.4} K. At 10^{6.0} K, the 95% upper limit on the emission measure is about 0.0004 cm^{-6} pc for solar abundance plasma with foreground neutral hydrogen column of 2 x 10^{18} cm^{-2}. This constraint, derived primarily from limits on the extreme ultraviolet emission lines of highly ionized iron, is well below the range for the local hot bubble estimated previously from soft X-ray studies. To support the emission measures inferred previously from X-ray data would require depletions much higher than the moderate values reported previously for hot gas.Comment: 13 pages, 4 figures, 1 tabl

Eigenfunctions of transfer operators and cohomology

The eigenfunctions with eigenvalues 1 or -1 of the transfer operator of Mayer are in bijective correspondence with the eigenfunctions with eigenvalue 1 of a transfer operator connected to the nearest integer continued fraction algorithm. This is shown by relating these eigenspaces of these operators to cohomology groups for the modular group with coefficients in certain principal series representations

Some Practical Considerations for Providing Access to the Postsecondary Environment

Whether initiating the design and development of new programs/or modifying existing programs/those who seek to support deaf/hard-of-hearing students in mainstreamed environments must carefully consider the nature and needs of both the academic environment and the student. Developing systems of support which are effective, cost-effective, and relevant to faculty and students requires dose examination of the broader questions of organization/ administration and resources/ as well as specific attention to details of classroom d3mamics and thoughtful analysis of students\u27 academic/and personal-social needs. Recognition of the interaction among these various elements is critical and suggests that efforts towards planning, development, and evaluation should include joint participation of administrators, faculty, support providers, and students to ensure that all critical needs are identified and addressed

Hecke operators on period functions for Γ0(n)\Gamma_0(n)

Matrix representations of Hecke operators on classical holomorphical cusp forms and the corresponding period polynomials are well known. In this article we derive representations of Hecke operators for vector valued period functions for the congruence subgroups $\Gamma_0(n)$. For this we use an integral transform from the space of vector valued cusp forms to the space of vector valued period functions.Comment: v2: corrected version, submitted to Journal of Number, 29 pages, 1 figur

The symplectic origin of conformal and Minkowski superspaces

Supermanifolds provide a very natural ground to understand and handle supersymmetry from a geometric point of view; supersymmetry in $d=3,4,6$ and $10$ dimensions is also deeply related to the normed division algebras. In this paper we want to show the link between the conformal group and certain types of symplectic transformations over division algebras. Inspired by this observation we then propose a new\,realization of the real form of the 4 dimensional conformal and Minkowski superspaces we obtain, respectively, as a Lagrangian supermanifold over the twistor superspace $\mathbb{C}^{4|1}$ and a big cell inside it. The beauty of this approach is that it naturally generalizes to the 6 dimensional case (and possibly also to the 10 dimensional one) thus providing an elegant and uniform characterization of the conformal superspaces.Comment: 15 pages, references added, minor change

The Lerch Zeta Function II. Analytic Continuation

This is the second of four papers that study algebraic and analytic structures associated with the Lerch zeta function. In this paper we analytically continue it as a function of three complex variables. We that it is well defined as a multivalued function on the manifold M equal to C^3 with the hyperplanes corresponding to integer values of the two variables a and c removed. We show that it becomes single valued on the maximal abelian cover of M. We compute the monodromy functions describing the multivalued nature of this function on M, and determine various of their properties.Comment: 29 pages, 3 figures; v2 notation changes, homotopy action on lef

An Approach for Developing National Guidelines for Postsecondary Support Services Programs

This paper presents a case for developing standards for specialized support programs serving deaf students in postsecondary institutions. A step-by-step plan for producing standards for the evaluation, development, and accreditation of these programs is outlined. Criteria for forming flexible standards which (1) account for variations in program size and type and (2) enhance support services which make postsecondary education more accessible for deaf students are clarified. The importance of teamwork between postsecondary specialists and generalists to link standards for special service programs to the process of accrediting regular institutions of higher education is emphasized. An example of accrediting a special college for deaf students is discussed. Results from a process of setting priorities for future actions in developing program standards which emerged from a professional conference are reported. Expected benefits of these standards to enhancing program quality are described

A New Measurement of the Average FUV Extinction Curve

We have measured the extinction curve in the far-ultraviolet wavelength region of (900 -- 1200 A) using spectra obtained with the Berkeley EUV/FUV spectrometer during the ORFEUS-I and the ORFEUS-II missions in 1993 and 1996. From the complete sample of early-type stars observed during these missions, we have selected pairs of stars with the same spectral type but different reddenings to measure the differential FUV extinction. We model the effects of molecular hydrogen absorption and exclude affected regions of the spectrum to determine the extinction from dust alone. We minimize errors from inaccuracies in the cataloged spectral types of the stars by making our own determinations of spectral types based on their IUE spectra. We find substantial scatter in the curves of individual star pairs and present a detailed examination of the uncertainties and their effects on each extinction curve. We find that, given the potentially large uncertainties inherent in using the pair method at FUV wavelengths, a careful analysis of measurement uncertainties is critical to assessing the true dust extinction. We present a new measurement of the average far-ultraviolet extinction curve to the Lyman limit; our new measurement is consistent with an extrapolation of the standard extinction curve of Savage & Mathis (1979).Comment: 13 pages text, 7 figures 4 tables. Sent as gzipped tar, with ms.tex and 7 figure

eredeti vigjáték 3 felvonásban - irta Tóth Kálmán

Debreceni Nemzeti Színház. Szerdán Április 11-kén 1866. Szathmáry Károly, a pesti nemzeti szinház volt tagja, mint vendég. Szakál Rózsa, szerződött tag első fellépteDebreceni Egyetem Egyetemi és Nemzeti Könyvtá