The Department of Engineering is internationally renowned for the quality of its research. In the 2008 Research Assessment Exercise (RAE), the Department submitted over 90% of its academic staff. The quality profile, as judged by the RAE, showed that 90% of the research was internationally recognised, internationally excellent or world leading in terms of originality, significance, and rigour.

The Department of Engineering has six research groups:

- Bioengineering
- Control and Instrumentation
- Electrical Power and Power Electronics
- Mechanics of Materials
- Radio Systems
- Thermofluids and Environmental Engineering

The Department also hosts research in the following cross-disciplinary groupings:

- Advanced Microscopy Centre
- Energy Centre
- Centre for Analytical Excellence
- Systems Biology Lab
- Centre for Mathematical Modelling

When downloading papers please observe the normal copyright codes and conventions for their use.

### Recent Submissions

This paper presents a numerical study on using vibration analysis to detect degradation in degrading polyesters. A numerical model of a degrading plate sample is considered. The plate is assumed to degrade following the typical behaviour of amorphous copolymers of polylactide and polyglycolide. Due to the well-known autocatalytic effect in the degradation of these polyesters, the inner core of the plate degrades faster than outer surface region, forming layers of materials with varying Young׳...

Samami, Hassan; Pan, Jingzhe

We present solutions of the laminar compressible boundary-layer flows over the family of rotating cones subject to surface mass flux. The work is a generalization of previous studies of the compressible rotating-disk flow and incompressible rotating-cone flow without surface mass flux. Transformations are used which lead to a system of generalized von Kármán equations with boundary conditions parameterized by half-angle and a mass-flux parameter. Results are discussed in terms of wall tempera...

Towers, P. D.; Garrett, Stephen J.

Bioresorbable polymers have been successfully used in clinical applications for many decades. They are those types of polymers that degrade into the human body and often don’t need to be removed out of the body, because their degradation products metabolise and enter the general metabolic pathways. However, there has been an increasing demand for better reliability and degradation control of bioresorbable polymeric devices causing researchers to abandon trial-and-error approaches to model-bas...

Samami, Hassan

Power semiconductors are the most important and enabling components in power converters, similar to the “muscle” in a living body. However, they are controlled by the central control unit, which is similar to the “brain” in a living body. Power semiconductors in power electronic systems process and control power flow. Largely different from their electronic counterpart used in signal processing, power semiconductor devices handle much higher voltages and currents for power flow control. In or...

Ji, Bing; Cao, Wenping; Pickert, Volker

A major weakness among loading models for pedestrians walking on flexible structures proposed in recent years is the various uncorroborated assumptions made in their development. This applies to spatio-temporal characteristics of pedestrian loading and the nature of multi-object interactions. To alleviate this problem, a framework for the determination of localised pedestrian forces on full-scale structures is presented using a wireless attitude and heading reference systems (AHRS). An AHRS c...

Bocian, Mateusz; Brownjohn, J. M. W.; Racic, V.; Hester, D.; Quattrone, A.... et al.

Two main architectures used to develop software for modern embedded applications are “event triggered” (ET) and “time triggered” (TT). ET designs involve creating systems which handle multiple interrupts; by contrast, only one interrupt is ever enabled in a TT design, and this interrupt is usually linked to a timer “Tick.” Although TT architectures are widely used in safety-related designs, they are less familiar to developers of mainstream embedded systems. The work on this research began fr...

Lakhani, Farah; Pont, Michael J.

It is known that most enzyme-facilitated reactions are highly temperature dependent processes. In general, the temperature coefficient, Q10, of a simple reaction reaches 2.0-3.0. Nevertheless, some enzyme-controlled processes have much lower Q10 (about 1.0), which implies that the process is almost temperature independent, even if individual reactions involved in the process are themselves highly temperature dependent. In this work, we investigate a possible mechanism for this apparent temper...

Kotov, N. V.; Baker, R. E.; Dawidov, D. A.; Platov, K. V.; Valeyev, Najil V.... et al.

Embedded software engineers are dealing with complex and large software codes, which will continue to grow. To achieve a cost-effective design, concomitant hardware and software development is required during early design phases. This paper presents an open-source platform based design framework that combines different ADLs and simulators aiming at improving embedded software productivity, targeting future many-core embedded systems. The proposed approach adopts three models: RTL-VHDL level; ...

Madalozzo, Guilherme; Mandelli, Marcelo; Ost, Luciano; Moraes, Fernando G.

This research contributes to a better understanding of how reconfigurable Field Programmable Gate Array (FPGA) devices can safely be used as part of satellite payload data processing systems that are exposed to the harsh radiation environment in space. Despite a growing number of publications about low-level mitigation techniques, only few studies are concerned with high-level Fault Detection, Isolation and Recovery (FDIR) methods, which are applied to FPGAs in a similar way as they ar...

Siegle, Felix

This thesis considers control system enhancement for Wave Energy Converters (WECs), of the point-absorber type, used for water desalination. The thesis makes several contributions. Firstly, it is shown that a type of nonlinear control system previously used in the literature provides global stability guarantees for this type of WEC in the absence of input constraints. Following this, several anti-windup techniques for a certain class of nonlinear systems with input constraints are deve...

Lekka, Angeliki

This paper presents a computational study of the role played by surface diffusion on first-stage sintering of powders that densify by grain-boundary diffusion. Coupled grain-boundary and surface diffusion is considered as the mechanism for matter redistribution. By using several novel approaches of presentation of the numerical data, it is shown that the assumption of fast surface diffusion is invalid for typical sintering conditions and materials in first stage of sintering. The study reveal...

Pan, Jingzhe; Luo, Wendong

Atomic simulations were undertaken to analyse the effect of polymer chain scission on amorphous poly(lactide) during degradation. Many experimental studies have analysed mechanical properties degradation but relatively few computation studies have been conducted. Such studies are valuable for supporting the design of bioresorbable medical devices. Hence in this paper, an Effective Cavity Theory for the degradation of Young's modulus was developed. Atomic simulations indicated that a volume of...

Gleadall, Andrew; Pan, Jingzhe; Kruft, Marc-Anton

Molecular dynamics (MD) simulations are widely used to analyse materials at the atomic scale. However, MD has high computational demands, which may inhibit its use for simulations of structures involving large numbers of atoms such as amorphous polymer structures. An atomic-scale finite element method (AFEM) is presented in this study with significantly lower computational demands than MD. Due to the reduced computational demands, AFEM is suitable for the analysis of Young's modulus of amorph...

Gleadall, Andrew; Pan, Jingzhe; Ding, Lifeng; Kruft, Marc-Anton; Curcó, David

This paper presents a constitutive law that predicts the changes in elastic moduli, Poisson's ratio and ultimate tensile strength of bioresorbable polymers due to biodegradation. During biodegradation, long polymer chains are cleaved by hydrolysis reaction. For semi-crystalline polymers, the chain scissions also lead to crystallisation. Treating each scission as a cavity and each new crystal as a solid inclusion, a degrading semi-crystalline polymer can be modelled as a continuum solid contai...

Samami, Hassan; Pan, Jingzhe

This paper presents an understanding of how initial molecular weight and initial monomer fraction affect the degradation of bioresorbable polymers in terms of the underlying hydrolysis mechanisms. A mathematical model was used to analyse the effects of initial molecular weight for various hydrolysis mechanisms including noncatalytic random scission, autocatalytic random scission, noncatalytic end scission or autocatalytic end scission. Different behaviours were identified to relate initial mo...

Gleadall, Andrew; Pan, Jingzhe; Kruft, Marc-Anton; Kellomäki, Minna

A mathematical model was developed to relate the degradation trend of bioresorbable polymers to different underlying hydrolysis mechanisms, including noncatalytic random scission, autocatalytic random scission, noncatalytic end scission or autocatalytic end scission. The effect of each mechanism on molecular weight degradation and potential mass loss was analysed. A simple scheme was developed to identify the most likely hydrolysis mechanism based on experimental data. The scheme was first de...

Gleadall, Andrew; Pan, Jingzhe; Kruft, Marc-Anton; Kellomäki, Minna

Increasing chip power densities allied to the continuous technology shrink is making emerging multiprocessor embedded systems more vulnerable to soft errors. Due the high cost and design time inherent to board-based fault injection approaches, more appropriate and efficient simulation-based fault injection frameworks become crucial to guarantee the adequate design exploration support at early design phase. In this scenario, this paper proposes a fast and flexible fault injector framework, cal...

Rosa, Felipe R.; Kastensmidt, Fernanda; Reis, Ricardo; Ost, Luciano

FinFET technology appears as an alternative solution to mitigate short-channel effects in traditional CMOS down-scaled technology. Emerging embedded systems are likely to employ FinFET and dynamic voltage scaling (DVS), aiming to improve system performance and energy-efficiency. This paper claims that the use of DVS increases the susceptibility of FinFET-based SRAM cells to soft errors under radiation effects. To investigate that, a methodology that allows determining the critical charge acco...

Rosa, F. R.; Brum, R. M.; Wirth, G.; Ost, Luciano; Reis, R.

This work investigates the effects of temperature and voltage scaling in neutron-induced bit-flip in SRAM memory cells. Proposed approach allows determining the critical charge according to the dynamic behavior of the temperature as a function of the voltage scaling. Experimental results show that both temperature and voltage scaling can increase in at least two times the susceptibility of SRAM cells to soft error rate (SER). In addition, a model for electrical simulation for soft error and d...

Rosa, F. R.; Brum, R. M.; Wirth, G.; Kastensmidt, F.; Ost, Luciano... et al.

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