Ilori, OM; Jaworski, AJ; Mao, X
Heat exchangers are considered to be critical components of thermoacoustic systems and their appropriate design and development are essential for the development of next generation of thermoacoustic systems. In this work, the heat transfer and oscillatory flow behaviour in and around three identical parallel-plate heat exchangers with constant wall temperatures were investigated using 2-D CFD simulation method. The heat exchangers are arranged in series (one 'heat source' centrally positioned between two 'heat sinks') and placed within an oscillatory flow induced by a standing wave. The effects of three different edge shapes (blunt, ogive and round) at the entrance and exit...
Kerdegari, H.; Kim, Y.; Stafford, T.; Prescott, T.J.
This paper provides a novel psychophysical investigation of headmounted
vibrotactile interfaces for sensory augmentation. A 1-by-7 headband
vibrotactile display was used to provide stimuli on each participant’s forehead.
Experiment I investigated the ability to identify the location of a vibrotactile
stimulus presented to a single tactor in the display; results indicated that localization
error is uniform but biased towards the forehead midline. In Experiment
II, two tactors were activated simultaneously, and participants were asked to indicate
whether they experienced one or two stimulus locations. Participants reported
the funneling illusion—experiencing one stimulus when two tactors were
activated—mainly for the shortest inter-tactor difference. We discuss the significance
of these results for the...
Riihonen, T.; Vehkaperä, M.; Wichman, R.; Wang, X.
© 2015 IEEE. This paper concerns the performance of two-way point-to-point multiple-input multiple-output (MIMO) links. In particular, the system of interest comprises a pair of multiantenna full-duplex terminals that communicate with each other through a MIMO radio channel under residual self-interference from imperfect mitigation using joint decoding for reception. The new theoretical result underlying this study is to express asymptotic achievable rates in the system whose dimensions grow without bound when detection and decoding is mismatched due to the residual self-interference and spatial data streams are separately encoded using some practical digital modulation scheme, in contrast to ideal matched decoding...
Shen, Q.; Liu, W.; Cui, W.; Wu, S.L.
To reach a higher number of degrees of freedom by exploiting the
fourth-order difference co-array concept, an effective structure extension
based on two-level nested arrays is proposed. It increases
the number of consecutive lags in the fourth-order difference coarray,
and a virtual uniform linear array (ULA) with more sensors
and a larger aperture is then generated from the proposed structure,
leading to a much higher number of distinguishable sources with
a higher accuracy. Compressive sensing based approach is applied
for direction-of-arrival (DOA) estimation by vectorizing the fourthorder
cumulant matrix of the array, assuming non-Gaussian impinging
Quichaud, F.; Burgess, I.W.; Huang, S-S
It is widely recognized that composite floor slabs experiencing large displacement develop a central zone of hydrostatic membrane tension, surrounded and equilibrated by a ring of membrane compression around the periphery. This mechanism, known as tensile membrane action, can greatly enhance the load-bearing capacity of a slab compared with that defined by yield line analysis. This is a very useful effect in cases where large deflections can be accepted, particularly in fire-resistance design of composite slabs, since the strength enhancement permits some beams to be left unprotected. Studies of tensile membrane action in the 1960s led to the development of...
Ryall, N; Crook, R; Weinstein, JA
On bringing a metal and a semiconductor into contact, a diodic interface can be created, the Schottky barrier. Photovoltaic devices based on the sensitization of a Schottky barrier have been reported. In these devices, the proposed mechanism is electron harvesting of electrons injected over a Schottky barrier interface into a semi-conductor film. This mechanism exploits the relatively long mean free path of hot electrons through a noble metal film.
Williams, MJ; Shires, A
This paper demonstrates the validation of a CFD code for external and internal automotive flows. Specifically, it illustrates the ability of rapid multi-block grid regeneration for topologically similar configurations, and the modelling of the effect of vortex generators without the addition of their physical geometry to the solution domain. This flow control technology is then applied to the air inlet and duct system of a generic-racing car to demonstrate how the performance may be modified.
Abdullahi, SD; Dyer, ME; Proll, LG
We present an O(nv) Basis Oriented Pivoting (BOP) algorithm for enumerating vertices of simple polyhedra associated with dual LI(2) systems. The algorithm is based on a characterisation of their graphical basis structures, whose set of edges are shown to consist of vertex-disjoint components that are either a tree or a subgraph with only one cycle. The algorithm generates vertices via operations on the basis graph, rather than by simplex transformations.
Ndosi, M; Hill, J; Tennant, A; Hale, C; Hardware, B; Adebajo, A
Van Labeke, N; Kirby, J; Roberts, TE
This position paper describes a long-term Technology-Enhanced Learning initiative at the Leeds Institute of Medical Education in which a personalised adaptive learning mentor will be deployed for all MBChB students enrolled in the course. The system, myPAL, is enriching the existing TEL programs embedded in the curriculum and will be leveraging recent advances in Learning Analytics and Open Learner Modelling. The paper presents the context of the project and the opportunities that deployment settings will offer, and highlights the research and development strands that will underpin it.
Lord, C.; Tang, N.; Rongong, J.
The use of entangled metallic wires as vibrational dampers and shock isolators is of interest in a variety
of applications. By taking advantage of the frictional contact between the contiguous wires, it has been
shown that significant amounts of energy dissipation can be achieved. The amount of energy dissipation
is highly dependent on many factors with one in particular being the excitation amplitude. When the
excitation amplitude is low, a combination of the number of contact points, in which have relative
motion, and the contact pressure are lessened often leading to a sacrifice in energy dissipation. In this
paper, spherical metallic rigid bodies are embedded within...
Feltwell, Tom; Lawson, Shaun; Kirman, Benjamin John; Vines, John
It has long been identified that people consciously curate, manage and maintain multiple online individual identities based on characteristics such as race, gender, and societal status; research has also established that people may choose to emphasise one such identity other another as a means to avoid stigmatisation, discrimination and stereotyping. The rise of online state, corporate, and peer surveillance however threatens to disrupt this process by modelling, categorising and restraining identity to that which has been surveilled. We posit that new anti-surveillance tactics may emerge that allow users the freedom to manage and switch their identities in ways that seek...
Awad, MI; Abouhossein, A; Chong, B; Dehghani-Sanij, AA; Richardson, R; Moser, D; Zahedi, S
Powered lower limb prosthesis are facing energy and efficiency challenges. This article presents an investigation into reducing the energy losses and increasing the efficiencies of energy regeneration for a powered prosthetic knee during level ground walking. The results showed that the regeneration and overall system efficiencies would dramatically increase if the negative mechanical load in the braking quadrants are within the regenerative zone of the motor. This approach reduced the energy losses in the stance and swing phases and increased the possibility of harvesting more negative mechanical energy during level ground walking.
Awad, MI; Abouhossein, A; Dehghani-Sanij, AA; Richardson, R; Moser, D; Zahedi, S; Bradley, D
This paper presents a development of a semi-active prosthetic knee, which can work in both active and passive modes based on the energy required during the gait cycle of various activities of daily livings (ADLs). The prosthetic limb is equipped with various sensors to measure the kinematic and kinetic parameters of both prosthetic limbs. This prosthetic knee is designed to be back-drivable in passive mode to provide a potential use in energy regeneration when there negative energy across the knee joint. Preliminary test has been performed on transfemoral amputee in passive mode to provide some insight to the amputee/prosthesis interaction...
Allsop, M; Powell, RA; Namisango, E
Carpenter, A; Macgill, SM
The aim of this paper is to evaluate the new (summer 2000) EU Directive on port reception facilities for ship-generated waste and cargo residues. Five key elements of this Directive are considered with respect both to their potential effectiveness relative to existing practices, and to suggested weaknesses. The elements are: the mandatory provision of reception facilities in all ports; the mandatory use of such facilities by all ships; notification requirements on all ships; a mandatory common charging system; and compliance provisions. On the basis of this analysis, conclusions are drawn about the effectiveness of the new EU Directive as an...
Carpenter, A; Macgill, SM
The aim of this paper is to evaluate the need for the new (summer 2000) EU Directive on Port Reception Facilities for Ship-Generated Waste and Cargo Residues. A core issue is the extent to which the new Directive duplicates provisions already in place (the Convention on the Prevention of Marine Pollution from Ships, the Paris Memorandum of Understanding, and the Bonn Agreement) through which all EU member states make available port reception facilities for the disposal of all types of waste from ships in ports, and undertake inspection and monitoring. This includes provision of facilities for timely reception of residues...
Razavi, M; Salehi, JA
We employ photon-counting techniques to analyze the performance of an all-optical fiber-optic code division multiple access (CDMA) network incorporating multiple optical amplifiers. Our analysis is based on obtaining characteristic functions indicating the photon-count of the output of a block of CDMA code pulse to its input count. The bit error rate (BER) results are obtained using two methods, namely, saddle-point and Gaussian approximations. From our BER analysis, we develop some insight into the optimum distribution of optical amplifiers and their corresponding gain setting parameter
Harbottle, D; Rhodes, D; Jones, TF; Biggs, SR
Multiphase process design and optimization often depends upon the rheological properties of sludges and slurries. In practice the task of determining these important properties is usually carried out by removing small samples from a process line or process unit and performing tests with proprietary bench-top analysers near to site or at a remote laboratory. Sampling will remain an important procedure in industrial processes, but there is also a strong case for augmenting the routine information obtained using an in situ sensor, as suggested below. Sampling protocols can result in extensive turnaround periods from sample collection to the generation of results....
Drawing on scholarship on multimedia performance as well as psychophysical actor training, this paper will present a research project undertaken in November 2014, which explored the use of mobile phones, a. as cameras for the development of a live-feed ‘kinaesthediting’ application and b. as tools that produce quadrophonic sound in response to the actor's movement. As Frank Camilleri has attested ‘psychophysicality, in discourse, if not in practice, is an important battle that has been won’ (2013, p. 30). Spanning the entire 20th century, psychophysical training has become the dominant paradigm that underpins both the theory and practice of contemporary actor...