Browsing University of Hertfordshire by Title
Now showing items 15671-15690 of 24305
-
Observability of intermittent radio sources in galaxy groups and clusters
(2018-11-11)We have carried out numerical hydrodynamic simulations of radio jets from active galactic nuclei using the PLUTO simulation code, with the aim of investigating the effect of different environments and intermittency of ... -
Observation of Gouy-phase-induced transversal intensity changes in focused beams
(2005)We created superpositions of two different TEM modes in focused beams. Such modes show relative dephasing along the beam axis due to Gouy's phase. This leads to interference effects and significant modifications of a beam's ... -
Observation of H2O in a strongly lensed Herschel-ATLAS source at z=2.3
(2011)The Herschel survey, H-ATLAS, with its large areal coverage, has recently discovered a number of bright, strongly lensed high-z submillimeter galaxies. The strong magnification makes it possible to study molecular species ... -
Observation of intermetallic Ni3Ti whiskers during combustion synthesis reactions in the Ni-Ti-C system
(1995-10)Initial studies of self-propagating reactions in the Ni-Ti-C system have revealed the formation of NiTi intermetallic whiskers via the VLS mechanism, in addition to the expected product of TiC in a nickel matrix. The ... -
The observation of metastable molybdenum carbides
(1991-02-01) -
Observation of quantum coherence by means of temporal Bell-type inequalities
(1997)Violation of temporal Bell inequalities, based on the premises of realism and non-invasive measurability, provides a criterion for exhibiting macroscopic quantum coherence. Although the experimental refutation of this kind ... -
Observation system for the technical-tactical analysis of judo by the Rio 2016 Olympic champions
(2024-05-20)An observational methodology system has been designed which allows the observation and analysis of the technical-tactical behaviour and interaction of judokas during competition. The observation instrument (JUTACTIC) is ... -
Observation- and Model-Based Estimates of Particulate Dry Nitrogen Deposition to the Oceans
(2017-07-05)Anthropogenic nitrogen (N) emissions to the atmosphere have increased significantly the deposition of nitrate (NO3−) and ammonium (NH4+) to the surface waters of the open ocean, with potential impacts on marine productivity ... -
Observational constraints on the physical nature of submillimetre source multiplicity : chance projections are common
(2018-05-11)Interferometric observations have demonstrated that a significant fraction of single-dish submillimetre (submm) sources are blends of multiple submm galaxies (SMGs), but the nature of this multiplicity, i.e. whether the ... -
Observational evidence for AGN feedback in early-type galaxies
(2007)A major amendment in recent models of hierarchical galaxy formation is the inclusion of so-called active galactic nucleus (AGN) feedback. The energy input from an active central massive black hole is invoked to suppress ... -
Observational evidence that positive and negative AGN feedback depends on galaxy mass and jet power
(2017-10-11)Several studies support the existence of a link between the AGN and star formation activity. Radio jets have been argued to be an ideal mechanism for direct interaction between the AGN and the host galaxy. A drawback of ... -
Observational limits on the gas mass of a z=4.9 galaxy
(2012-10-20)We present the results of a search for molecular gas emission from a star-forming galaxy at z = 4.9. The galaxy benefits from magnification of 22 +/- 5x due to strong gravitational lensing by the foreground cluster MS1358+62. ... -
An observational study of prescribing and administration of intravenous drugs in a general hospital
(1998-03)The prescribing and administration of intravenous drugs on two surgical and one medical ward were studied to determine the number, type and causes of errors occurring. The errors were classified for potential to harm the ... -
Observational study of sites of triggered star formation - CO and mid-infrared observations
(2009)Context. Bright-rimmed clouds (BRCs) are isolated molecular clouds located on the edges of evolved HII regions. Star formation within these clouds may have been triggered through the propagation of photoionisation-induced ... -
An observational study of the needs and quality of life amongst patients in the treatment of Alzheimer's Dementia with cholinesterase inhibitors
(2008)Alzheimer’s dementia is one of the most commost mental health disorders associated with aging. In its earlier stages sufferers live independently but gradually rely increasingly on loved ones or formal carers for support ... -
Observations and a model for the infrared continuum of Centaurus A
(1999)We present ISOPHOT S, ISOSWS and 8 to 13 mi- cron ground based observations of Centaurus A that show prominent PAH and silicate features. These and other data are used to construct a model for the infrared continuum. We ... -
Observations of Barred Galaxies
(Astronomical Society of the Pacific, 1999)We review general observational properties of bars in galaxies, and relations between bars, their dynamics, and (circum)nuclear activity. We consider new measurements of bar fractions and of the distribution of bars with ... -
Observations of flat-spectrum radio sources at λ850 μm from the James Clerk Maxwell Telescope II. April 2000 to June 2005
(2010)Calibrated data for 143 flat-spectrum extragalactic radio sources are presented at a wavelength of 850 μm covering a 5-yr period from 2000 April. The data, obtained at the James Clerk Maxwell Telescope using the Submillimetre ...