Browsing University of Hertfordshire by Title
Now showing items 20483-20502 of 23976
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Spectroscopic signatures of youth in low-mass kinematic candidates of young moving groups
(2014-04-21)We present a study of age-related spectral signatures observed in 25 young low-mass objects that we have previously determined as possible kinematic members of five young moving groups: the Local Association (Pleiades ... -
A spectroscopic study of a large sample of L/T transition brown dwarfs
(University of Hertfordshire, 2014-09-25)In this thesis I present the spectroscopic analysis of a large sample of L and T dwarfs, in order to constrain the sub-stellar initial mass function and formation history. The main points I tried to address are the ... -
A SPectroscopic Survey of Biased Halos in the Reionization Era (ASPIRE): A First Look at the Rest-frame Optical Spectra of z > 6.5 Quasars Using JWST
(2023-07-01)Studies of rest-frame optical emission in quasars at z > 6 have historically been limited by the wavelengths accessible by ground-based telescopes. The James Webb Space Telescope (JWST) now offers the opportunity to probe ... -
A SPectroscopic Survey of Biased Halos in the Reionization Era (ASPIRE): JWST Reveals a Filamentary Structure around a z = 6.61 Quasar
(2023-07-01)We present the first results from the JWST program A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE). This program represents an imaging and spectroscopic survey of 25 reionization-era quasars and ... -
Spectroscopy and kinematics of low-mass members of young moving groups
(2010)We study a target sample of 68 low-mass objects (with spectral types in the range M4.5–L1) previously selected via photometric and astrometric criteria, as possible members of five young moving groups: the Local Association ... -
Spectroscopy and modelling of the cytoplasmic domain of the gamma-subunit of the high affinity immunoglobulin E receptor
(1994)The high affinity receptor for IgE, Fc epsilon RI, is responsible for immediate hypersensitivity reactions. In rodents Fc epsilon RI is a tetrameric complex, alpha beta gamma 2 of non-covalently attached subunits: one ... -
Spectroscopy-based modelling of the 3D structure of the β subunit of the high affinity IgE receptor
(2000)The high affinity IgE receptor, possesses a tetrameric structure. The 243 residue β subunit is a polytopic protein with four hydrophobic membrane-spanning segments, whereas the individual α and γ subunits are bitopic ... -
Spectrum Sensing of DVB-T2 Signals in Multipath Channels for Cognitive Radio Networks
(VDE VERLAG GMBH, 2018-06-14)In this paper, spectrum sensing of digital video broadcasting-second generation terrestrial (DVB-T2) signals in different fading environments with energy detection (ED) is considered. ED is known to achieve an increased ... -
Spectrum Sensing of DVB-T2 Signals using a Low Computational Noise Power Estimation
(2018-08-28)Cognitive radio is a promising technology that answers the spectrum scarcity problem arising from the proliferation of wireless networks and mobile services. In this paper, spectrum sensing of digital video broadcasting-second ... -
Speech errors and the phonological similarity effect in short-term memory: evidence suggesting a common locus
(2007)In three experiments, we tested the hypothesis that those errors in immediate serial recall (ISR) that are attributable to phonological confusability share a locus with segmental errors in normal speech production. In the ... -
Speech-Based Real-Time Subtitling services
(2004)Recent advances in technology have led to the availability of powerful speech recognizers at low cost and to the possibility of using speech interaction in a variety of new and exciting practical applications. The purpose ... -
Speedy services : time, usability and E-Commerce
(University of Hertfordshire, 1999)Times play a vital role in human-computer interaction. However, when interaction takes place over a network, as is the case with e-commerce, it is impossible to guarantee that temporal requirements will be met. Therefore ... -
Spelling and Reading Representations in Children
(2008-07-24)This thesis sought to conceptualise children’s spelling and reading representations in a novel way based upon the implicit-explicit framework proposed by the Representational-Redescription (RR) model (Karmiloff-Smith, ... -
Spelling development in young children: a case of Representational Redescription?
(2007)Two experiments explored children’s spelling development in the context of the Representational-Redescription Model (Karmiloff-Smith, 1992). Fifty-one 5-7 year old children (experiment one) and 44 5-6 year olds (experiment ...