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Now showing items 15820-15839 of 24046
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The opportunity of narrative inquiry for information literacy research: Narrative thinking and storying data
(2024-03-26)This presentation will discuss narrative thinking, transformational moments, and the art of crafting stories from data, all explored in my journey into narrative inquiry research. My study 'Once upon a Narrative' adopts ... -
Opposite-end behaviour of dynamic microtubules
(1991)Microtubules are dynamic polar structures with different kinetic properties at the two ends. The inherent asymmetry of the microtubule lattice determines that the relationship between the addition reaction of tubulin-GTP ... -
Optic-fiber scramblers and a fourier transform lens as a means to tackle the problem on the overlap factor of lidar
(ESA PUBLICATIONS DIVISION C/O ESTEC, 2004)We present an instrumental approach to formation of the light beam in the image space of lidar optical receiver, behind its field stop, aimed at removing some adverse range dependent effects of the lidar overlap factor on ... -
Optical amplifier number and placement in the SuperPON architecture
(2004-01-01)Three alternative optically amplified long reach, wide splitting ratio PON (SuperPON) amplifier placement strategies (i.e architectural configurations) are modelled using the Virtual Photonic Integration (VPI) simulation ... -
Optical and infrared polarimetry and photometry of blazars
(1990)We have carried out a polarization study of 44 blazars and candidate blazars at optical and near-infrared frequencies covering the period 1986 August to 1988 February. The data show flux and polarization properties changing ... -
The optical and infrared-emission of blazars
(1990)A polarization study is presented of 44 blazars and candidate blazars observed at optical and near-IR frequencies. The spectrum of the radiation is discussed in terms of shock acceleration models. Frequency dependence is ... -
Optical and IR light curves of VV Puppis
(1983)Optical (0.36-0.6 micron) light curves with time resolutions of seconds, and infrared (IR) (1.25-2.2 microns) light curves with time resolutions of minutes, are presented for VV Puppis during a high state. The optical light ... -
Optical and lasing properties of fluorophosphate glass
(1980-07)Neodymium-doped fluorophosphate glass is a laser material newly-developed for use in high power laser fusion systems. The low refractive index (n ∼ 1.45) and low dispersion (Abbe number ∼90) of fluorophosphate glasses give ... -
Optical and microphysical characterization of aerosol layers over South Africa by means of multi-wavelength depolarization and Raman lidar measurements
(2016-07-05)Optical and microphysical properties of different aerosol types over South Africa measured with a multi-wavelength polarization Raman lidar are presented. This study could assist in bridging existing gaps relating to aerosol ... -
Optical and microphysical characterization of biomass-burning and industrial-pollution aerosols from multiwavelength lidar and aircraft measurements
(2002-11-16)[1] During the Lindenberg Aerosol Characterization Experiment (LACE 98) simultaneous measurements with ground-based and airborne lidars and with two aircraft equipped with aerosol in situ instrumentation were performed. ... -
Optical and microphysical properties of fresh biomass burning aerosol retrieved by Raman lidar, and star-and sun-photometry
(2011-01-14)A fresh biomass-burning pollution plume was monitored and characterized in terms of optical and microphysical properties for the first time with a combination of Raman lidar and star- and sun-photometers. Such an instrument ... -
Optical and microphysical properties of severe haze and smoke aerosol measured by integrated remote sensing techniques in Gwangju, Korea
(2009-02)Aerosol optical and microphysical parameters from severe haze events observed in October 2005 at Gwangju, Korea (35.10 N, 126.53 E) were determined from the ground using a multi-wavelength Raman lidar, a sunphotometer, and ... -
Optical and microphysical properties of smoke over Cape Verde inferred from multiwavelength lidar measurements
(2011-09)Lidar measurements of mixed dust/smoke plumes over the tropical Atlantic ocean were carried out during the winter campaign of SAMUM-2 at Cape Verde. Profiles of backscatter and extinction coefficients, lidar ratios, and ... -
Optical and near-infrared colours as a discriminant of the age and metallicity of stellar populations
(2009-08-01)We present a comprehensive analysis of the ability of current stellar population models to reproduce the optical (ugriz) and near-infrared (JHK) colours of a small sample of well-studied nearby elliptical and S0 galaxies. ... -
An optical and near-infrared polarization survey of nearby starburst and interacting galaxies
(1991)Broadband optical and near-infrared polarization and flux density measurements of a sample of 27 starburst and interacting galaxies are presented. The observed polarizations are generally small (P is less than 1 percent) ... -
An optical and near-infrared polarization survey of Seyfert and broad-line radio galaxies. 1 : statistical properties
(1990)The present broad-band and near-IR flux density and polarization measurements of a sample of 71 Seyfert galaxies and three broad-line radio galaxies confirms earlier indications that the polarization of Seyferts is generally ... -
An optical and near-infrared polarization survey of Seyfert and broad-line radio galaxies. 2 : the wavelength dependence of polarization
(1990)We discuss the wavelength dependence (0.44-2.2 micron) of polarization of the sample of 71 Seyfert and three broad-line radio galaxies presented in Paper I. For four galaxies, 3A 0557-353, Fairall 51, IC 4329A and NGC 3753, ... -
Optical and near-infrared spectropolarimetry of the infrared-luminous galaxy IRAS 23060+0505
(1996)We present optical and near-IR spectropolarimetry of the type 2 infrared-luminous galaxy IRAS 23060+0505, which clearly shows both broad Hα and Paalpha in polarized flux. The full widths at half maximum (FWHM) of these ...