Browsing by Title
Now showing items 20589-20608 of 24085
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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 ... -
Spheroidal post-mergers in the local Universe
(2012-03-01)Galaxy merging is a fundamental aspect of the standard hierarchical galaxy formation paradigm. Recently, the Galaxy Zoo project has compiled a large, homogeneous catalogue of 3373 mergers, through direct visual inspection ... -
Spice drugs : los cannabinoides como nuevas drogas de diseño
(2009)Some smokable herbal mixtures under the brand name Spice drugs have been sold on the Internet and in specialised shops (smart shops) since 2004. The mixtures are advertised as an exotic incense blend which releases a rich ... -
"Spice", "Kryptonite", "Black Mamba": An overview of brand names and marketing stragtegies of Novel Psychoactive Substances on the Web
(2014)Novel Psychoactive Substances (NPSs) are often sold online as “legal” and “safer” alternatives to International Controlled Drugs (ICDs) with captivating marketing strategies. Our aim was to review and summarize such ...