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Articles 1 - 22 of 22
Full-Text Articles in Physical Sciences and Mathematics
Epithelial To Mesenchymal Transition And Breast Cancer, Eva Tomaskovic-Crook, Erik W. Thompson, Jean Paul Thiery
Epithelial To Mesenchymal Transition And Breast Cancer, Eva Tomaskovic-Crook, Erik W. Thompson, Jean Paul Thiery
Australian Institute for Innovative Materials - Papers
Epithelial-mesenchymal plasticity in breast carcinoma encompasses the phenotypic spectrum whereby epithelial carcinoma cells within a primary tumor acquire mesenchymal features and re-epithelialize to form a cohesive secondary mass at a metastatic site. Such plasticity has implications in progression of breast carcinoma to metastasis, and will likely influence response to therapy. The transcriptional and epigenetic regulation of molecular and cellular processes that underlie breast cancer and result in characteristic changes in cell behavior can be monitored using an increasing array of marker proteins. Amongst these markers exists the potential for emergent prognostic, predictive and therapeutic targeting.
Fabrication And Superconducting Properties Of Highly Dense Mgb2 Bulk Using A Two-Step Sintering Method, Minoru Maeda, Yue Zhao, Yoshifumi Watanabe, Hiroaki Matsuoka, Y Kubota
Fabrication And Superconducting Properties Of Highly Dense Mgb2 Bulk Using A Two-Step Sintering Method, Minoru Maeda, Yue Zhao, Yoshifumi Watanabe, Hiroaki Matsuoka, Y Kubota
Australian Institute for Innovative Materials - Papers
We investigated on microstructure and superconducting properties of high-density MgB2superconductors synthesized by a heat-treatment method combining a short period of sintering at 1100°C with a following annealing at a low temperature. The two-step sintering method was found to achieve a coexistence of a high density and broadened XRD full width at half maximum (FWHM) of MgB2 peak in the samples. The onset of diamagnetism at 5 T was approximately 2 K higher than those of the samples heat-treated by single-step sintering at high or low temperatures. Different second-step annealing temperatures were examined in this work. …
Crystal Structure And Electronic And Thermal Properties Of Tbfeaso0.85, N Kaurav, Y.T Chung, Y.K Kuo, R S Liu, T S Chan, J.M Chen, J.F Lee, H.S Sheu, Xiaolin Wang, S X. Dou, Sung-Ik Lee, Y.G Shi, A.A Belik, K Yamaura, E Takayama-Muromachi
Crystal Structure And Electronic And Thermal Properties Of Tbfeaso0.85, N Kaurav, Y.T Chung, Y.K Kuo, R S Liu, T S Chan, J.M Chen, J.F Lee, H.S Sheu, Xiaolin Wang, S X. Dou, Sung-Ik Lee, Y.G Shi, A.A Belik, K Yamaura, E Takayama-Muromachi
Australian Institute for Innovative Materials - Papers
The crystal structure and the electronic and thermal properties of a high-quality polycrystalline TbFeAsO0.85 sample made by a high-pressure technique are investigated. The crystal structure, as determined by synchrotron X-ray powder diffraction, possesses a tetragonal unit cell (space group: P4/nmm) with lattice parameters of a=b=3.8851 Å and c =8.3630 Å. In order to elucidate the electronic structure and oxidation states of corresponding elements, X-ray absorption near-edge structure (XANES) spectra are presented. The XANES spectra confirm that the oxidation states of Fe, As, and Tb in the TbFeAsO0.85 sample are ~Fe2+, …
Vortex Phase Boundaries From Ferromagnetic Measurements In A Patterned Disc Array, Ching-Ching Tsai, J Choi, Sunglae Cho, S J. Lee, Bimal K. Sarma, C Thompson, O Chernyashevskyy, Ivan Nevirkovets, V Metlushko, K Rivkin, J B. Ketterson
Vortex Phase Boundaries From Ferromagnetic Measurements In A Patterned Disc Array, Ching-Ching Tsai, J Choi, Sunglae Cho, S J. Lee, Bimal K. Sarma, C Thompson, O Chernyashevskyy, Ivan Nevirkovets, V Metlushko, K Rivkin, J B. Ketterson
Australian Institute for Innovative Materials - Papers
Using a recently developed broadband microwave measurement technique, we have studied the hysteretic appearance and disappearance with in-plane magnetic field of the uniform ferromagnetic resonance (FMR) mode of a patterned permalloy disk array. The observed features are consistent with our micromagnetic simulations (performed on an infinite array of such disk), which predict that on decreasing the magnetic field from a positively magnetized state at positive fields the array will: (i) pass continuously into a double-vortex state; (ii) followed by a discontinuous transition to a single-vortex state; and finally (iii) discontinuously into a negatively magnetized state at some negative field. The …
Microwave Absorption Measurements Using Broad-Band Meanderline Approach, Ching-Ching Tsai, J Choi, Sunglae Cho, S J. Lee, Bimal K. Sarma, C Thompson, O Chernyashevskyy, Ivan Nevirkovets, J B. Ketterson
Microwave Absorption Measurements Using Broad-Band Meanderline Approach, Ching-Ching Tsai, J Choi, Sunglae Cho, S J. Lee, Bimal K. Sarma, C Thompson, O Chernyashevskyy, Ivan Nevirkovets, J B. Ketterson
Australian Institute for Innovative Materials - Papers
We describe a technique that permits broad-band, field-dependent ferromagnetic and electron paramagnetic resonance absorption measurements that is applicable to thin films and patterned micro-/nanostructured arrays and is based on a wire-wound meanderline approach. Techniques to prepare meanderlines and perform microwave measurements are described along with some demonstrations involving an electron paramagnetic resonance calibration/test material, 2,2-diphenyl-1-picryl-hydrazyl, and a ferromagnetic cobalt thin film.
Ybco Films With Zr4+ Doping Grown By Mod Method, Min Liu, Hongli Suo, Shuai Ye, Dongqi Shi, Yue Zhao, Lin Ma, Meiling Zhou
Ybco Films With Zr4+ Doping Grown By Mod Method, Min Liu, Hongli Suo, Shuai Ye, Dongqi Shi, Yue Zhao, Lin Ma, Meiling Zhou
Australian Institute for Innovative Materials - Papers
YBa2Cu3O7-delta (YBCO) films with Zr doping have been prepared successfully by the trifluoroacetate metal-organic deposition (TFA-MOD) method through dissolving Zr acetylacetonate into the precursor solution. Yttria-stabilized zirconia(YSZ)nanoparticles were detected in the doped YBCO films by XRD. From the analysis of XRD omega and phi scans, the doped films have better out-of-plane and in-plane textures than those of the un-doped YBCO film. Although the doped YBCO films have lower T-c than that of the un-doped YBCO film, a very significant enhancement of normalized J(c) is displayed as compared to the undoped film at applied fields, indicating that an effective pinning force …
Transdermal Drug Delivery: Microfabrication Insights, Ciprian Iliescu, Bangtao Chen, Jiashen Wei, Zhilian Yue
Transdermal Drug Delivery: Microfabrication Insights, Ciprian Iliescu, Bangtao Chen, Jiashen Wei, Zhilian Yue
Australian Institute for Innovative Materials - Papers
The paper presented an enhancement solution for transdermal drug delivery using microneedles array with biodegradable tips. The microneedles array was fabricated by using deep reactive ion etching (DRIE) and the biodegradable tips were made to be porous by electrochemical etching process. The porous silicon microneedle tips can greatly enhance the transdermal drug delivery in a minimum invasion, painless, and convenient manner, at the same time; they are breakable and biodegradable. Basically, the main problem of the silicon microneedles consists of broken microneedles tips during the insertion. The solution proposed is to fabricate the microneedle tip from a biodegradable material - …
The Role Of Optical Rectification In The Generation Of Terahertz Radiation From Gabias, Krunal Radhanpura, Stuart Hargreaves, Roger A. Lewis, M Henini
The Role Of Optical Rectification In The Generation Of Terahertz Radiation From Gabias, Krunal Radhanpura, Stuart Hargreaves, Roger A. Lewis, M Henini
Australian Institute for Innovative Materials - Papers
We report on a detailed study of the emission of terahertz-frequency electromagnetic radiation from layers of GaBiyAs1−y (0≤yBand (001) GaAs substrates. We measure two orthogonally polarized components of the terahertz radiation emitted under excitation by ultrashort near-infrared laser pulses in both transmission and reflection geometries as a function of the crystal rotation about its surface normal as well as the effect of in-plane magnetic field and pump fluence on the terahertz emission. We conclude that the principal mechanism for terahertz generation is via optical rectification rather than transient currents.
Ultrafast Interactions In Condensed Matter As Source Of Terahertz-Frequency Electromagnetic Radiation, Stuart Hargreaves, Roger A. Lewis
Ultrafast Interactions In Condensed Matter As Source Of Terahertz-Frequency Electromagnetic Radiation, Stuart Hargreaves, Roger A. Lewis
Australian Institute for Innovative Materials - Papers
Terahertz (THz, 1012 Hz) frequency radiation has long proven to be elusive relative to microwaves at lower frequenc ies and infrared radiation at higher frequencies. We have investigated several solid-state materials as candidate terahertz-frequency emitters under excitation by ultra-short (12 fs) pulses of near-infrared radiation, and present the results here with a comparison between different emission mechanisms.
The Generation Of Terahertz Frequency Radiation By Optical Rectification, Krunal Radhanpura, Stuart Hargreaves, Roger A. Lewis
The Generation Of Terahertz Frequency Radiation By Optical Rectification, Krunal Radhanpura, Stuart Hargreaves, Roger A. Lewis
Australian Institute for Innovative Materials - Papers
One of the means of generating terahertz (THz, 1012 Hz) frequency radiation is through the bulk second-order nonlinear effect of optical rectification. Optical rectification occurs if high-intensity light is directed onto an electrooptic material such as ZnTe. If the excitation beam contains components of two or more frequencies then difference-frequency mixing, also known as optical rectification, may take place. Depending on the spectrum of the excitation beam, the resulting frequency may be in the THz range. While this phenomenon has been known for some time, and has been studied in various zinc blende crystals, attention does not seem to …
Nano-Indentation Of Epoxy Hydro Gels For Soft Tissue Applications, Nandula D. Wanasekara, V. K. Vadlamani, Animesh Agrawal, Vijaya B. Chalivendra, Paul D. Calvert
Nano-Indentation Of Epoxy Hydro Gels For Soft Tissue Applications, Nandula D. Wanasekara, V. K. Vadlamani, Animesh Agrawal, Vijaya B. Chalivendra, Paul D. Calvert
Australian Institute for Innovative Materials - Papers
Nano-indentation characterization studies on epoxy hydro gels used for soft tissue applications are conducted using atomic force microscope (AFM). Two kinds of hydro gels: (a) plain epoxy hydro gels, and (b) epoxy hydro gels reinforced with three-dimensional polyurethane fiber pattern are considered in this study. The three-dimensional fiber pattern is generated using rapid robo-casting technique. Again these two hydro gel types are tested under five different conditions: (a) dry gel, (b) saturated with certain percentage of water, (c) saturated with 100% water, (d) 100% partially immersed in water, and (e) 100% fully immersed in water. Preliminary results obtained on plain …
Microstructural And Compositional Analysis Of Strontium-Doped Lead Zirconate Titanate Thin Films On Gold-Coated Silicon Substrates, S Sriram, M Bhaskaran, D Rg Mitchell, K T. Short, A Holland, A Mitchell
Microstructural And Compositional Analysis Of Strontium-Doped Lead Zirconate Titanate Thin Films On Gold-Coated Silicon Substrates, S Sriram, M Bhaskaran, D Rg Mitchell, K T. Short, A Holland, A Mitchell
Australian Institute for Innovative Materials - Papers
This article discusses the results of transmission electron microscopy ~TEM!-based characterization of strontium-doped lead zirconate titanate ~PSZT! thin films. The thin films were deposited by radio frequency magnetron sputtering at 3008C on gold-coated silicon substrates, which used a 15 nm titanium adhesion layer between the 150 nm thick gold film and ~100! silicon. The TEM analysis was carried out using a combination of high-resolution imaging, energy filtered imaging, energy dispersive X-ray ~EDX! analysis, and hollow cone illumination. At the interface between the PSZT films and gold, an amorphous silicon-rich layer ~about 4 nm thick! was observed, with the film composition …
Nanocolumnar Preferentially Oriented Pszt Thin Films Deposited On Thermally Grown Silicon Dioxide, S Sriram, M Bhaskaran, A Mitchell, D Rg Mitchell, G Kostovski
Nanocolumnar Preferentially Oriented Pszt Thin Films Deposited On Thermally Grown Silicon Dioxide, S Sriram, M Bhaskaran, A Mitchell, D Rg Mitchell, G Kostovski
Australian Institute for Innovative Materials - Papers
We report the first instance of deposition of preferentially oriented, nanocrystalline, and nanocolumnar strontium-doped lead zirconate titanate (PSZT) ferroelectric thin films directly on thermal silicon dioxide. No intermediate seed or activation layers were used between PSZT and silicon dioxide. The deposited thin films have been characterised using a combination of diffraction and microscopy techniques.
Molecules With Multiple Personalities: How Switchable Materials Could Revolutionise Chemical Sensing, Fernando Benito-Lopez, R Byrne, Yizhen Wu, Lorrain Nolan, Jung Ho Kim, King Tong Lau, Gordon G. Wallace, Dermot Diamond
Molecules With Multiple Personalities: How Switchable Materials Could Revolutionise Chemical Sensing, Fernando Benito-Lopez, R Byrne, Yizhen Wu, Lorrain Nolan, Jung Ho Kim, King Tong Lau, Gordon G. Wallace, Dermot Diamond
Australian Institute for Innovative Materials - Papers
Worldwide, the demand for sensing devices that can conform with the requirements of large-scale wireless sensor network (WSN) deployments is rising exponentially. Typically, sensors should be very low cost, low power (essentially self-sustaining), yet very rugged and reliable. At present, functioning WSN deployments involve physical transducers only, such as thermistors, accelerometers, photodetectors, flow meters, to monitor quantities like temperature, movement, light level and liquid level/flow. Remote, widely distributed monitoring of molecular targets remains relatively unexplored, except in the case of targets that can be detected directly using 'non-contact' techniques like spectroscopy. This paper will address the issues inhibiting the close …
Investigation Of Thz Emission By P-Gaassb, Stuart Hargreaves, L J. Bignell, Roger A. Lewis, D Schoenherr, M Saglam, H L. Hartnagel
Investigation Of Thz Emission By P-Gaassb, Stuart Hargreaves, L J. Bignell, Roger A. Lewis, D Schoenherr, M Saglam, H L. Hartnagel
Australian Institute for Innovative Materials - Papers
With a suitable electric field imposed and under illumination by ultrashort pulses of near-infrared radiation, GaAsSb emits THz-frequency electromagnetic radiation. We conclude that high-temperature-grown GaAsSb is a new class of THz source.
Generation Of Terahertz Radiation By Bulk And Surface Optical Rectification From Crystal Planes Of Arbitrary Orientation, Stuart Hargreaves, Krunal Radhanpura, Roger A. Lewis
Generation Of Terahertz Radiation By Bulk And Surface Optical Rectification From Crystal Planes Of Arbitrary Orientation, Stuart Hargreaves, Krunal Radhanpura, Roger A. Lewis
Australian Institute for Innovative Materials - Papers
The theory of second-order nonlinear bulk and third-order nonlinear surface electric-field-induced optical rectification is developed for zinc-blende 4¯3m crystal faces of arbitrary indices (hkl). The theory is then used to account for our experimental results for terahertz generation from GaAs high-index planes (11N)A and (11N)B, where N=2, 3, 4, and 5. The data combined with the calculations allow us to demonstrate that a surface field is present on both the Ga-rich and As-rich faces and to determine that the signs are opposite and that the strengths are similar. Such conclusions are inaccessible by work restricted to low-index planes.
Studies Of The Electroresistive Properties Of Electronic Oxides, Jonathan Knott, Roger A. Lewis
Studies Of The Electroresistive Properties Of Electronic Oxides, Jonathan Knott, Roger A. Lewis
Australian Institute for Innovative Materials - Papers
In this paper we report on the non-linear voltage-current relationship of three doped lanthanum manganite compounds (La0.8Li0.2MnO3, La0.66Sr0.33MnO3 and La0.8Pb0.2MnO3) and three manganite cobaltite compounds (DyMn0.5Co0.5O3, HoMn0.5Co0.5O3 and NdMn0.5Co0.5O3). We compare and contrast the magnitude and temperature dependence of the non-linear behaviour, and suggest this behaviour may be largely due to phase separation in the compounds. We also compare the behaviour of single-crystal and polycrystalline bulk samples of lead-doped lanthanum manganite (La0.8Pb0.2MnO3), which provide evidence for grain boundaries playing an important role in the non-linear voltage-current relationships in certain compounds.
The Emission Of Visible Radiation By Peeling Adhesive Tape, Evan Constable, Yunfei Hu, J. Horvat, Roger A. Lewis
The Emission Of Visible Radiation By Peeling Adhesive Tape, Evan Constable, Yunfei Hu, J. Horvat, Roger A. Lewis
Australian Institute for Innovative Materials - Papers
We have observed the emission of visible radiation on peeling adhesive tape from a spool. We have found that there is a fluctuation of light intensity in phase with the rotation of the spool from which the tape is being unwound. We have further found that the amount of light emitted initially increases as the unwinding speed is increased, then decreases at higher speeds.
Organic Bionics: Molecules, Materials And Medical Devices, Gordon G. Wallace, Simon E. Moulton
Organic Bionics: Molecules, Materials And Medical Devices, Gordon G. Wallace, Simon E. Moulton
Australian Institute for Innovative Materials - Papers
The uses of bionic devices that can improve the quality of human life are presented. Significant among them are the bionic ear or the bionic eye which has helped to regain use of important sensory organs. Bionics is the use of a biological entity and electronic devices that are put together to create the required implant.
A Superconducting Transistorlike Device Having Good Input-Output Isolation, Ivan Nevirkovets
A Superconducting Transistorlike Device Having Good Input-Output Isolation, Ivan Nevirkovets
Australian Institute for Innovative Materials - Papers
A multiterminal superconducting device with the S1IS2FIS3 structure (where S, I, and F denote a superconductor, an insulator, and a ferromagnetic material) is fabricated and characterized. Introducing a thin ferromagnetic layer into the middle electrode dramatically reduces parasitic back action of the acceptor junction (S1IS2) bias current on the injector junction (S2FIS3)current-voltage characteristic as compared with that for the formerly reported quiteron, a device exploiting similar operation principle.
Room Temperature Multiferroic Properties Of Nd: Bifeo3/Bi2femno6 Bilayered Films, Hongyang Zhao, Hideo Kimura, Zhenxiang Cheng, Xiaolin Wang, Takashi Nishida
Room Temperature Multiferroic Properties Of Nd: Bifeo3/Bi2femno6 Bilayered Films, Hongyang Zhao, Hideo Kimura, Zhenxiang Cheng, Xiaolin Wang, Takashi Nishida
Australian Institute for Innovative Materials - Papers
Nd0.1Bi0.9FeO3 /Bi2FeMnO6 bilayered films were deposited on Pt/Ti/SiO2 / Si substrate by pulsed laser deposition method. BiFeO3 is antiferromagnet while BiMnO3 is ferromagnet, the ordering of –Mn–O–Fe–O–Mn– is expected, which will induce the ferromagnetic interation in the film. The film shows typical ferromagnetic properties with the transition temperature of Tc of 440 K. The room temperature (RT) ferroelectric polarization was also observed, suggesting that the film is a promising RT multiferroism.
Dehydrogenation/Rehydrogenation Mechanism In Aluminum Destabilized Lithium Borohydride, Xuebin Yu, Guanglin Xia, Zaiping Guo, Hua-Kun Liu
Dehydrogenation/Rehydrogenation Mechanism In Aluminum Destabilized Lithium Borohydride, Xuebin Yu, Guanglin Xia, Zaiping Guo, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
LiBH4/Al mixtures with various mol ratios were prepared by ball milling. The hydrogen storage properties of the mixtures were evaluated by differential scanning calorimetry/ thermogravimetry analyses coupled with mass spectrometry measurements. The phase compositions and chemical state of elements for the LiBH4/Al mixtures before and after hydrogen desorption and absorption reactions were assessed via powder x-ray diffraction, infrared spectroscopy, and x-ray photoelectron spectroscopy. Dehydrogenation results revealed that LiBH4 could react with Al to form AlB2and AlLi compounds with a two-step decomposition, resulting in improved dehydrogenation. The rehydrogenation experiments were investigated at 600° …