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October 2017

Wendy SL Lee – Broadband terahertz circular-polarization beam splitter

October 5 @ 4:10 pm - 4:35 pm

Abstract Splitting circularly polarised waves is desirable for high-data rate wireless communications and study of molecular chirality at terahertz frequencies. Typically, this functionality is achieved using bulk optical systems with limitations in material availability, bandwidth and efficiency. As an alternative, we employ metasurfaces with spatially varying broadband birefringence to attain the same functionality. We demonstrate that a metasurface designed with gradually rotated birefringent resonators can deflect normally incident left handed circularly polarized (LHCP) and right handed circularly polarized (RHCP) waves…

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Peng Wang – Realizing long-term memory in cognitive architectures using resistive devices

October 5 @ 4:35 pm - 5:00 pm

Abstract Complex cognitive agents are expected to persist for a long time and acquire a large amount of knowledge in long-term memory. However, the hypothesized agent running on a von Neumann computer can generate substantial traffic across the memory hierarchy, and the sequential processing nature of von Neumann’s location-addressed computing scheme can be prohibitively inefficient and time-consuming for contextual information retrieval from a large knowledge base. An optimised hardware is needed. This research considers a flat resistive content-addressable memory as…

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Amir Parsa Anvar – An Investigation towards the Pixel Colour Statistics in Melanoma Cancer Histology Sample Images

October 19 @ 4:10 pm - 4:35 pm
S112, Engineering South

Abstract: Melanoma is a deadly form of skin cancer, attributed to the deaths of hundreds of Australians, every year. Digital Histology Images have been used by previous researchers for the diagnosis of melanoma and other cancers, by the automatic detection of mitotic cells. However, although statistical models have been developed for the colour based segmentation of the data, these works have not undertaken a careful analysis of the pixel-based statistics of the data, prior to its modelling. This talk will…

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Hang Yin – Practical Application of Collocation Method in Power Flow Study of South Australia Grid

October 19 @ 4:35 pm - 5:00 pm
S112, Engineering South

Abstract The stochastic collocation method is proposed to solve probabilistic power flow (PPF) model of South Australia (SA). And this model is based upon historical acquisition of power system data of SA. In SA, numbers of wind farms are installed and the variability of wind speed brings more uncertainties into the power system. The traditional deterministic power flow (DPF) computation does not consider the probabilistic nature of power system uncertainties, so PPF computation is imperative. However, as a commonly used…

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The Conversation

October 26 @ 4:10 pm - 5:00 pm
S112, Engineering South

The Conversation is a news website where academic rigour meets journalistic flair. All stories are authored by academics working closely with The Conversation editors. Writing for The Conversation can help take your research to a national and global audience and build your profile. Presented by Dr Sarah Keenihan, Section Editor Science and Technology, this session will allow you to: • Hear more about The Conversation • See what sorts of articles we publish • Learn how to pitch your ideas…

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November 2017

Siti Nailah Mastura Zainarry – Concept of a Stub-Loaded Reconfigurable Reflectarray Unit Cell

November 2 @ 4:10 pm - 4:35 pm
EM324 Engineering Math Building

Abstract A concept of a stub-loaded varactor-controlled reconfigurable reflectarray unit cell is proposed and investigated. The rationale of the design is based on the impedance transformation characteristics of the stubs which are exploited to achieve the unit cell reconfigurability. In that context, the optimization of the length of the stub loaded with varactors is presented, which provides an enhancement of the frequency agility feature. To satisfy the space requirement of a unit cell, a potential design of the reconfigurable reflectarray…

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Ali Malakooti – Improvement of Selectivity and Suppression Level of A Microstrip Lowpass Filter

November 2 @ 4:35 pm - 5:00 pm
EM324 Engineering Math Building

Abstract A new microstrip lowpass filter that has a near vertical roll-off skirt and an ultra-wide stopband performance with a high suppression level is presented. The filter comprises a high-impedance line that is symmetrically loaded with a series of stepped-impedance and T-shaped resonators. The design procedure comprises three steps. In the first step, three resonators with complementary shapes and low-frequency transmission zeros are separately designed before being combined together to attain the high roll-off rate. The next step is designing…

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Brett Donnellan – A Novel Energy Storage Sizing Technique

November 16 @ 4:10 pm - 4:35 pm
EM324 Engineering Math Building

Abstract As energy storage cost reduces, a common question is: When can a household disconnect from the grid and use PV/storage to supply load?    An important consideration is the appropriate sizing of storage and PV system to ensure total cost is less than the cost of purchasing energy from a retailer. A common technique to determine the  required energy storage capacity is to perform a simulation of generation/load data to ensure load is satisfied to a given level of reliability.…

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Alberto J. Sarnari – Reliable Steady State Voltage Stability Limit Estimation using Newton-Raphson Method

November 16 @ 4:35 pm - 5:00 pm
EM324 Engineering Math Building

Abstract In power network, load flow calculation is very important to identify the steady-state limit operating conditions of the network. In the literature different approaches are used to perform this calculation. In this seminar, the use of Newton-Raphson (N-R) method combined with the discrete Fourier transform and robust Padé approximation (NR–DFT–Padé) is demonstrated and we show how this method can obtain the saddle-node bifurcation points (voltage stability limit) and the high voltage solution branch for load buses of a power…

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December 2017

Prof. Lang White – Gaussian Generalised Reciprocal Processes – Building on Markov Models

December 7 @ 4:10 pm - 5:00 pm
EM324 Engineering Math Building

Intended Audience This presentation is partly a tutorial on certain Gaussian random process models, realisation and state estimation. Many people are familiar with Gaussian Markov state space models but may not know how these models arise from the conditional independence assumptions specifying the Markov property. Graphical models are a useful tool for understanding this process and for deriving optimal filters and smoothers, so the seminar devotes some time to this topic. Generalisations to reciprocal processes follow in a similar manner. Students should…

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