Some Reverses of the Generalised Triangle Inequality in Complex Inner Product Spaces

Some reverses for the generalised triangle inequality in complex inner product spaces that improve the classical Diaz-Metcalf results and applications are given

Hybodont sharks of the English Bathonian and Callovian (Middle Jurassic).

Recent bulk sampling and study of museum collections has revealed a high diversity of hybodont sharks from the English Bathonian, with 15 species being recognised. In addition, study of dental and skeletal material from the English Callovian has allowed the diagnosis of a new genus and species, Planohybodus peterboroughensis gen. et sp. nov., allowing the Bathonian species Hybodus grossiconus Agassiz to be referred to Planohybodus. Two additional new genera, Secarodus and Frangerodus, are erected for the Bathonian taxa Hybodus polyprion Agassiz and Strophodus lingualis Woodward, respectively. Egertonodus duffini sp. nov. is described and the diagnosis of Egertonodus based on dental material is discussed. The previously unrecorded Hybodus sp., Parvodus sp., and Lonchidion sp. are recognised but left in open nomenclature. Asteracanthus medius (Owen) is recorded in the British Bathonian for the first time, and the status of Bathonian nominal species of Asteracanthus are assessed. Bathonian hybodonts showed great diversity in trophic ecology and many of the species are specific to particular palaeoenvironments

Description of the Fifth Instar of \u3ci\u3eApache Degeerii\u3c/i\u3e (Homoptera: Fulgoroidea: Derbidae)

(excerpt) Apache degeerii (Kirby) ranges from Maine south to Florida and west to Iowa and Texas; it has also been recorded from British Columbia and Washington (Metcalf 1945. Wilson and McPherson 1980). This derbid has been recorded from oak, beech, maple, and hickory (Swezey 19(4); otherwise no information on its biology is available

Structural dichroism in the antiferromagnetic insulating phase of V_2O_3

We performed near-edge x-ray absorption spectroscopy (XANES) at V K edge in the antiferromagnetic insulating (AFI) phase of a 2.8% Cr-doped V_2O_3 single crystal. Linear dichroism of several percent is measured in the hexagonal plane and found to be in good agreement with ab-initio calculations based on multiple scattering theory. This experiment definitively proves the structural origin of the signal and therefore solves a controversy raised by previous interpretations of the same dichroism as non-reciprocal. It also calls for a further investigation of the role of the magnetoelectric annealing procedure in cooling to the AFI phase.Comment: 4 pages 3 figures. To be published in Phys. Rev. B (2005

Narrow line width operation of a 980 nm gain guided tapered diode laser bar

We demonstrate two different schemes for the spectral narrowing of a 12 emitter 980 nm gain guided tapered diode laser bar. In the first scheme, a reflective grating has been used in a Littman Metcalf configuration and the wavelength of the laser emission could be narrowed down from more than 5.5 nm in the free running mode to 0.04 nm (FWHM) at an operating current of 30 A with an output power of 8 W. The spectrum was found to be tunable within a range of 16 nm. In the second scheme, a volume Bragg grating has been used to narrow the wavelength of the laser bar from over 5 nm to less than 0.2 nm with an output of 5 W at 20 A. To our knowledge, this is the first time spectral narrowing has been performed on a gain guided tapered diode laser bar. In the Littman Metcalf configuration, the spectral brightness has been increased by 86 times and in the volume Bragg grating cavity the spectral brightness has been improved over 18 times when compared to the free running operation. These schemes could be also extended for other wavelengths of interest in the future

Evolució i utilitat d'un clàssic del sanejament

Ingeniería de aguas residuales: tratamiento, vertido y reutilización Autores: George Tchobanoglous, Franklin L. Burton, H. David Stensel Editor: Metcalf & Eddy El Metcalf, como se llama popularmente a este manual, es posiblemente el libro sobre aguas residuales más conocido en las escuelas de ingeniería de todo el mundo. Es también uno de los manuales más veteranos. Siendo un libro de referencia mundial, incluso en los países en desarrollo, uno se cuestiona sobre su utilidad real en contextos de pobreza.Enginyeria d'aigües residuals: tractament, abocament i reutilització Autors: George Tchobanoglous, Franklin L. Burton, H. David Stensel Editor: Metcalf & Eddy El Metcalf, com s'anomena popularment a aquest manual, és possiblement el llibre sobre aigües residuals més conegut a les escoles d'enginyeria de tot el món. És també un dels manuals més veterans. Sent un llibre de referència mundial, fins i tot als països en desenvolupament, un es qüestiona sobre la seva utilitat real en contexts de pobresa.Peer Reviewe

Volume 9, Issue 2: Full Issue

Full issue of the January 1942 issue of Manuscripts. Includes work by: Joan Fuller, Jack Kilgore, Fred W. Michel, Betty Murnan, Isadore Camhi, Mary Wiley, Jeanne Gass, Alfred Brown, Ione Colligan, Jack Retherford, Catherine Cunningham, R. Gordon Moores, Alice J. Fisher, Norma Jackson, Thelma De Boer, Betty Lee Snyder, John Gumerson, Richard Jowitt, William Hickson, Bob Harris, Rachel Whelan, Edward N. Redfield, Anshelm Schultzberg, Willard L. Metcalf, and John Bundy

A Hubble Space Telescope Survey of X-ray Luminous Galaxy Clusters: Gravitationally Lensed Arcs and EROs

We are conducting a systematic lensing survey of X-ray luminous galaxy clusters at z~0.2 using the Hubble Space Telescope and large ground-based telescopes. We summarize initial results from our survey, including a measurement of the inner slope of the mass profile of A383, and a search for gravitationally lensed Extremely Red Objects.Comment: 4 pages, 2 figures. To appear in "A New Era in Cosmology" (ASP Conference Proceedings), eds. T. Shanks and N. Metcalf