21,056 research outputs found
TCM, TTCM, BICM and BICM-ID Assisted MMSE Multi-User Detected SDMA-OFDM Using Walsh-Hadamard Spreading
No full textSpace Division Multiple Access (SDMA) aided Orthogonal Frequency Division Multiplexing (OFDM) systems assisted by efficient Multi-User Detection (MUD) techniques have recently attracted intensive research interests. Forward Error Correction (FEC) schemes and frequency-domain spreading techniques can be efficiently amalgamated with SDMA-OFDM systems for the sake of improving the achievable performance. In this contribution a Coded Modulation (CM) assisted and Minimum Mean-Square Error (MMSE) multi-user detected SDMA-OFDM system combined with Walsh-Hadamard-Transform-Spreading (WHTS) across a number of subcarriers is proposed. The various CM schemes used are Trellis Coded Modulation (TCM), Turbo TCM (TTCM), Bit-Interleaved Coded Modulation (BICM) and Iteratively Decoded BICM (BICM-ID), which constitute bandwidth efficient schemes that combine the functions of coding and modulation. Invoking the WHTS technique is capable of further improving the average Bit Error Rate (BER) performance of the CM-SDMA-OFDM system, since the bursty error effects imposed by the frequency-domain fading encountered are spread over the entire WHT block length, therefore increasing the chances of correcting the transmission errors by the CM decoders
Chinese account of the Opium war
No full textShanghai: Kelly and Walsh, 1888. 2 p. l., ii, 82 p ; 21 cm. Added author: Wei, Yüan, 1794-1857. Persistent link to this record: https://encore.qub.ac.uk/iii/encore_qub/record/C__Rb115638
Rebuilding the abandoned: Walsh Bay Wharves and Me
No full textCreative Work Various screen prints and sculptural elements are presented for examination in the exhibition Rebuilding the abandoned: Walsh Bay Wharves and Me. The exhibition’s elements work in a tableau-style format using images of Walsh Bay Wharves to create a large-scale imagined pictorial memory of the facility that also illustrates my emotional abandonment. The full list of works is included in my research paper; some of the major works are: Wharf 8/9, 2014 Screen print 84 x 60 cm Burra Charter, 2014 Screen print 84 x 60 cm Facades, 2016 Silk screen, wire, timber, plaster 5 sculptures 24 x 32 x 30 cm Bollard 2013 Screen print 84 x 60 cm Traum II, 2016 Screen print 84 x 60 cm 14, 2013 Screen print 76 x 57 cm Jetties, 2014 Lightbox sculpture, wood, Perspex, silk screen 100 x 14 x 20 cm Wharf, 2014-16 21 screen prints, each 76 x 56 cm 3 sculptures, printed hessian, Dacron & wool 60 x 60 x 95 cm Research Paper This research paper is focussed on the role of history, memory, place and ruins in both the individual and communal psyche. I use these notions to tell the story of the abandonment of myself and Walsh Bay Wharves. I chose Walsh Bay Wharves as the primary element of my research project because of their place in Australia’s industrial development, their abandonment due to technological and economic changes, and their re-invention as a residential, tourism and creative industries hub. I look at how contemporary observers view the history of Walsh Bay Wharves and through this filter how I see myself. Walsh Bay Wharves is my muse that allows me to illustrate these feelings and thoughts around my identity. The paper charts the growth of this conceptual and creative approach and contextualizes my practice through exploring connections and influences with artists Anselm Kiefer, Rachel Whiteread and William Kentridge and writers and theorists Sigmund Freud, Rosalind Krauss and Walter Benjamin
Insights into the barriers and enablers faced by nurse/midwife clinician researchers in Australia
No full textBackground: Clinician researchers are described as health professionals who conduct research and provide clinical care. Whilst this dual expertise is common in medicine and increasingly in allied health disciplines, fewer nurses and midwives are engaged in clinician researcher roles. Aim: This study aimed to understand the barriers and enablers experienced by clinician researchers in nursing and midwifery in the Australian health systems. Methods: Semi-structured interviews were conducted with current nurse or midwife clinician researchers in Australia. Participants were classified as clinician researchers if they were registered nurses or midwives currently practising clinically whilst concurrently engaged in research. Interview data were analysed using iterative thematic analysis. In total, 15 interviews were conducted. Findings: Key themes identified included (i) perceived value; (ii) structural factors; and (iii) personal factors. Nurse and midwife clinician researchers reported feeling challenged by the absence of a clear career trajectory, and the constant undervaluing of nurse and midwife clinician researchers by health service leaders and peers. Discussion: Barriers included insufficient funding, motivation, mentorship, and leadership support. Enablers included protected research time, leadership support, and capacity-building. Participants also proposed changes to support clinician researcher career progression. These suggestions were used to put forward evidence-based recommendations for such a pathway. Conclusion: This study highlighted the need for a clearly articulated workforce model to support sustainable clinician researcher careers for nurses and midwives to overcome these barriers.Full Tex
Walsh & Hoyt: Cavernous Sinuses
No full textEach cavernous sinus is situated at the side of the body of the sphenoid bone and extends from the superior orbital fissure to the tip of the petrous portion of the temporal bone, a distance of slightly more than 2 cm
Walsh & Hoyt: Cortical Area V5
No full textArea V5 is also referred to as MT because of its location in the caudal third of the middle temporal gyrus of the owl monkey. Area 5 is the smallest of the named visual areas. V5 in humans is an oval area, located 5/6 cm anterior and dorsal to the foveal V1/V2 border, at the junction of Brodmann areas 19 and 37
Nickel based electrocatalysts for oxygen evolution in high current density,alkaline water electrolysers
No full textA number of nickel based materials are investigated as potential oxygen evolution catalysts under conditions close to those met in modern, high current density alkaline water electrolysers. Microelectrodes are used to avoid distortion of voltammetric data by IR drop even at the high current densities employed in such water electrolysers. High surface area nickel metal oxides prepared by cathodic deposition and mixed oxides prepared by thermal methods are considered. A mixed Ni/Fe oxide is the preferred electrocatalyst. The influence of hydroxide ion concentration and temperature on the voltammetry is defined. Preliminary stability tests in a zero gap cell with an OH? conducting membrane show no significant increase in overpotential during 10 days operation in 4 M NaOH electrolyte at a current density of 1 A cm?2 at 333 K
The politics and economics of regulatory impact assessment
No full textThis is the author accepted manuscript. The final version is available from the publisher via the link in this record
Development of a zinc-cerium redox flow battery
No full textRedox flow batteries (RFBs) can be used to store energy on the large and medium scale(kW – MW), particularly in applications such as load levelling of electrical powersupplies, power quality control application and facilitating renewable energy deployment.In this thesis, the development of a divided and undivided zinc-cerium redox flow batteryfrom its fundamental chemistry in aqueous methanesulfonic acid has been described. Thiscomprehensive investigation has focused on the selection of electrode materials,evaluation of zinc corrosion of the negative electrode, characterization of the redox flowbattery and the cycling performance. Voltammetric studies of both the zinc and the ceriumhalf-cell reactions have been carried out under various operating conditions and forelectrolyte compositions. These studies suggested that the positive electrode reactioncould limit the use of higher current densities. After testing a range of two- andthree-dimensional positive electrode materials, only three-dimensional platinised titaniummesh and carbon felts were capable of discharge at 50 mA cm-2 with high charge ( > 70 %)and voltage ( > 60 %) efficiencies in an divided system based on the optimum electrolytecompositions obtained in the half-cell studies. In order to avoid the diffusion of protonsacross the membrane and to simplify the construction, an undivided, membranelesssystem was proposed. With specific design arrangement and carbon felt positive electrode,this system can operate at room temperature with a high energy efficiency (~ 75 %)instead of 60 oC as reported in the patented system in the literature. In order to facilitatezinc electrodeposition and prevent zinc corrosion, several electrolytic additives andcorrosion inhibitors have been suggested. Further challenges and research directions arealso discussed
- …
