Research publications: Recent submissions
Now showing items 8721-8740 of 9764
-
Investigation of cyanide ions adsorbed on platinum and palladium coated silver island films by surface-enhanced Raman spectroscopy
(1999)Bimetallic films prepared by vacuum-depositing platinum onto silver island films have been evaluated for surface-enhanced Raman scattering (SERS), using CN− as the adsorbate. For platinum overlayers with mean thickness ... -
Investigation by surface enhanced Raman spectroscopy of the effect of oxygen or hydrogen plasmas on the surface chemistry of adsorbate-covered gold island films
(1999)The effects of radio-frequency-excited oxygen and hydrogen plasmas on gold island films with adsorbed CN-, thiophenate, or p-nitrobenzoate ions have been investigated by surface-enhanced Raman spectroscopy (SERS). An oxygen ... -
The production of precision silicon micromachined non-spherical particles for aerosol studies
(1992)A variety of accurately defined non-spherical particles have been produced in silicon dioxide and polycrystalline silicon using the process of silicon micromachining. The particles are of lengths 3μm, 4.5μm, 7.5μm, and ... -
A dual-wavelength single particle aerosol fluorescence monitor.
(2005)Laser diodes and light-emitting diodes capable of continuous sub-300 nm radiation emission will ultimately represent optimal excitation sources for compact and fieldable bio-aerosol monitors. However, until such devices ... -
Experimental and theoretical light scattering profiles from spherical and non-spherical particles
(1996)A laser light scattering instrument has been designed to allow an investigation of the wide angle spatial intensity distribution, or scattering profile, of light scattered by individual airborne particles constrained within ... -
A real-time monitoring system for airborne particle shape and size analysis
(1996)This paper describes a new instrument for the study of airborne particles. The instrument performs a rapid analysis of the transient spatial intensity distribution of laser-light scattered by individual aerosol particles ... -
Airborne particle shape and size classification from spatial light scattering profiles
(1992)A new instrument for the study of airborne particles is described. The instrument incorporates a laminar flow sample delivery system which constrains airborne particles to traverse a focussed laser beam in single file. ... -
Discrimination of micrometre-sized ice and super-cooled droplets in mixed-phase cloud
(2001)Preliminary experimental results are presented from an aircraft-mounted probe designed to provide in situ data on cloud particle shape, size, and number concentration. In particular, the probe has been designed to facilitate ... -
A Novel Instrument for Studying the Flow Behaviour of Erythrocytes through Microchannels Simulating Human
(1997)A novel instrument has been developed to study the microrheology of erythrocytes as they flow through channels of dimensions similar to human blood capillaries. The channels are produced in silicon substrates using ... -
A test of cirrus ice crystal scattering phase functions
(2003)In-situ ice crystal scattering has been measured in cirrus cloud with the Small Ice Detector laser scattering probe. Using light scattered from single particles (maximum dimension ∼<100 μm) at 4–10° and 20–40° we have ... -
Light scattering from deformed droplets and droplets with inclusions II : theoretical treatment
(2000)We provide theoretical results from the scattering of light by deformed liquid droplets and droplets with inclusions. With improved instrumentation and computer technologies available, researchers are able to employ ... -
Microfluidics based microcytometer: interfacing microfluidics with macrofluidics
(Springer Nature Link, 1998) -
Potential for recognition of airborne asbestos fibres from spatial laser scattering profiles
(1995)This Short Communication describes some preliminary results of research which seeks to develop a method by which individual airborne asbestos fibres may be detected in real-time within a contaminated environment. The method ... -
Light scattering from non-spherical airborne particles : experimental and theoretical comparisons
(1994)A laser light-scattering instrument has been designed to permit an investigation of the spatial intensity distribution of light scattered by individual airborne particles constrained within a laminar flow, with a view to ... -
The mean physical and optical properties of regional haze dominated by biomass burning aerosol measured from the C-130 aircraft during SAFARI 2000
(2003)Instrumentation on the Met Office C-130 aircraft measured aerosol physical and optical properties during the Southern African Regional Science Initiative (SAFARI 2000) in September 2002 while flying from Windhoek, Namibia. ... -
The 1st measurement of the Lyman continuum emission from normal stars
(1993)We report the first measurements of Lyman continuum emission from non-degenerate stars. The Wide Field Camera on-board ROSAT detected strong emission from Beta CMa (B1 II-III) and Epsilon CMa (B2 II). Both Kurucz LTE ... -
Excited hydrogen and the formation of molecular-hydrogen via associative ionization. 1 : Physical processes and outflows from young stellar objects
(1993)Rates for the associative ionization reaction H(n=2)+H→H2++e- are calculated. This reaction is found to be a greater contributor to the H2 formation rate than the direct radiative association reaction H(n=2)+H→H2+hν in ... -
Soft x-ray observations of the early b-giants beta and epsilon CMA
(1994)The study reports observations performed with the PSPC on board the Roentgensatellit (ROSAT) of the two nearby giant stars Beta CMa (B1 II-III) and Epsilon CMa (B2 II). Upper limits in the region of +/- 10 percent can be ... -
The shock-excited P-Cygni nebula
(1994)We have obtained images in the [N II] λ6584 line of the nebula around the luminous blue variable star P Cygni, using a 4 arcsec wide occulting strip. A nearly circular inner nebula is found, containing many bright ...