862 research outputs found
The power of VNA-driven quasi-optics to sense group molecular action in condensed phase systems
No full text© © 20xx IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.The versatility for quasi-optical circuits, driven by modern vector network analysers, is demonstrated for the purpose of low energy (meV) coherent spectroscopy. One such example is shown applied to the curing dynamics of a non-mercury-based dental cement. This highlights the special place the methodology holds as a 'soft-probe' to reveal the time-resolved energetics of condensed phased systems as they self-organise to adopt their low energy state.The authors would like to thank the Engineering and Physical Sciences Research Council (EPSRC, UK) for generous support (EP/1014845)
Clive Small on the real-life "Underbelly"
No full textOver the course of his career, Clive Small, one of NSW\u27s most successful detectives, saw it all. His book, "Smack Express: How organised crime got hooked on drugs" is an insight into drug trafficking and organised crime on Australia\u27s east coast. Written with journalist Tom Gilling, it features an extraordinary range of colourful characters and situations. Take "Aunty", the female drug lord who has been successfully importing kilos of cocaine into Australia for decades. Or the bloke who thought that throwing someone into the boot of a car and driving it to South Australia wasn\u27t kidnapping, because "he never asked to get out of the boot".
Clive Small is a former Assistant Commissioner of Police in NSW, and a former ICAC chief investigator. He resigned from ICAC in 2007 to pursue a defamation case against broadcaster Alan Jones. His investigations included the death of Griffith anti-drugs campaigner Donald McKay, the assassination of Cabramatta MP John Newman and the backpacker murders of Ivan Milat.
Tom Gilling is a former journalist and author. He has written a number of novels and co-authored "The Bagman: Final Confessions of Jack Herbert", about a corrupt Queensland policeman whose evidence in the 1980s Fitzgerald Inquiry had a huge impact on Queensland
Extrusion freeforming of millimeter-wave electromagnetic bandgap(EBG)photonic crystals
No full textExtrusion freeforming can be used for the rapid prototyping of millimeter-wave electromagnetic bandgap (EBG) structures. In this work, an alumina-polymer paste with a relatively high volatility solvent (propanol) was used and the characteristics of the ceramic paste, particularly the rheological features are described. The advantage of high volatility solvent is that the viscosity and elastic modulus of the paste are increased sharply as the solvent evaporates. Thus, the rigidity of the extruded filament is quickly increased as a small amount of solvent evaporates. Finally, by employing this procedure, different EBG structures such as 2-D, 3-D woodpile and aperiodic structures were fabricated and their bandgaps were measured. The experimental results show that extrusion freeforming is a relatively simple and easy method to fabricate these woodpile structures with a bandgap in the 90-110 GHz regio
Photograph - Burrows, Geoff, Accounting and Business Law, and Clive Morton, co-author, after receiving award for their book ‘The Canecutters’
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/283960Burrows, Geoff, Accounting and Business Law, and Clive Morton, co-author, after receiving award for their book ‘The Canecutters’286830
Item: [2003.0003.00938] "Photograph - Burrows, Geoff, Accounting and Business Law, and Clive Morton, co-author, after receiving award for their book ‘The Canecutters’
Photograph - Burrows, Geoff, Accounting and Business Law, and Clive Morton, co-author, who won award for their book ‘The Canecutters’
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/283981Burrows, Geoff, Accounting and Business Law, and Clive Morton, co-author, who won award for their book ‘The Canecutters’ 27 Feb 1987286851
Item: [2003.0003.00959] "Photograph - Burrows, Geoff, Accounting and Business Law, and Clive Morton, co-author, who won award for their book ‘The Canecutters’
Review of “St. Clive:” An Eastern Orthodox Author Looks Back at C. S. Lewis
No full textReview of C. J. S. Hayward, “St. Clive:” An Eastern Orthodox Author Looks Back at C. S. Lewis (Wheaton, Illinois: C. J. S. Hayward Publications, 2000-19). 381 pages. $49.99. ISBN 9781794669956
Extrusion freeforming of millimeter wave electromagnetic bandgap (EBG) structures
No full textPurpose – The aim of this paper is to provide an easy method of extrusion freeforming to fabricate microwave electromagnetic bandgap (EBG) crystals. EBG crystals are periodic dielectric structures that can block wave propagation and generate a bandgap. These crystals can be used in high capability antennae, electromagnetic wave semiconductors, microresonators, high-reflectivity mirrors and polarizing beam splitters.Design/methodology/approach – The effects of extrusion process parameters and paste characteristics were investigated. Finally, one-period and two-period woodpile EBG crystals with bandgaps in the frequency region of 90-110?GHz were fabricated and the bandgap was measured.Findings – The filament diameter is influenced by whether extrusion is carried out with or without a substrate and by the free fall-distance from the nozzle. The quality of lattice structures is dependent on paste flow and properties. A ceramic paste with 60?vol.?% (the fraction of ceramic powder based on solvent-free polymer) was well suited to fabrication. The solvent content also influenced the fabrication. The experimental results show that under ~12 per cent solvent mass fraction in the paste and relatively high extrusion ram velocity (more than 0.014?mm/s) at a pressure of 14?MPa, samples with high quality were fabricated.Originality/value – This paper demonstrates that the rapid prototyping method of extrusion freeforming can be applied for the fabrication of EBG crystals from ceramic powders and the important factors which influence the product quality are identified
Fabrication and evaluation of solid freeformed electromagnetic bandgap structures
No full textMicrowave electromagnetic bandgap (EBG) structures have potential applications in improving the radiating features of antennas and the transmission properties of waveguides. Extrusion freeforming is a rapid prototyping technique for assembling ceramic dielectric lattice structures directly from a computer design file. It is without heating, cooling or polymerization processes to contend with at the construction stage. Various limitations on overall build thickness prompted us to explore lamination by welding to produce larger three-dimensional quasi-crystals. Microwave transmission through normal and side incidence showed that the bandgap frequency was in the 90–110 GHz region in all directions, matching the design that was informed by computer modelling. In order to image the EBG internal crystal structure, micro-computed tomography was used for scanning and reconstruction. Finally, the effect of structural defects including roundness and sagging of filaments and deviation of inter-filament spacing caused by fabrication errors on bandgap frequency was investigated.<br/
Rapid prototyping of ceramic millimeterwave metamaterials: Simulations and experiments
No full textRapid prototyping by an extrusion freeforming technique, of ceramic metamaterials based on a woodpile structure at millimeterwave frequencies has been performed. The finite difference time domain technique is applied for the design and characterization of the proposed metamaterials. The transmittance of the millimeterwave metamaterials is measured in the range of 75–110 GHz. Both measurement and simulation results are in good agreement
Fabrication of electromagnetic crystals by extrusion freeforming
No full textElectromagnetic crystals have potential applications from microwave to optical frequencies. At present, several methods can be applied to fabricate these structures, for example, stereolithography and wafer etching. In this work, extrusion freeforming, one of the linear solid freeforming methods, was used to fabricate electromagnetic crystals and the forming, drying, debinding and sintering stages are described. This method allows structures to be designed on a computer file and rendered directly as physical objects so that prototypes can be created quickly. A wide range of ceramic powders can be used so that dielectric constant and loss factor can be tailored. Structures with deliberate defects such as missing filaments or circular structures can be made
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