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Full-Text Articles in Engineering
Effects Of Nano-Clay Content, Foaming Temperature And Foaming Time On Density And Cell Size Of Pvc Matrix Foam By Presented Least Absolute Shrinkage And Selection Operator Statistical Regression Via Suitable Experiments As A Function Of Mmt Content, Zhixiong Li, Hamzeh Shahrajabian, Seyed Amin Bagherzadeh, Hamid Jadidi, Arash Karimipour, Iskander Tlili
Effects Of Nano-Clay Content, Foaming Temperature And Foaming Time On Density And Cell Size Of Pvc Matrix Foam By Presented Least Absolute Shrinkage And Selection Operator Statistical Regression Via Suitable Experiments As A Function Of Mmt Content, Zhixiong Li, Hamzeh Shahrajabian, Seyed Amin Bagherzadeh, Hamid Jadidi, Arash Karimipour, Iskander Tlili
Faculty of Engineering and Information Sciences - Papers: Part B
Present article aims to investigate the effect of nano-clay content, foaming temperature and foaming time on the density and cell size of the PVC matrix foam. The cell size would affect the insulating and mechanical properties. The foaming temperature is set in three levels of 70, 80 and 90 °C, foaming time is set in three levels of 10, 20, and 30 s; and nano-clay is in content of 1, 3, and 5 wt%. Outputs consist the density and cell size, which affect impact the thermal conductivity, mechanical properties and the weight of the polymer foam. In addition the Least …
Above-Roof Temperature Impacts On Heating Penalties Of Large Cool Roofs In Australian Climates – Final Report, Wenye Lin, Alan Green, Georgios Kokogiannakis, Paul Cooper
Above-Roof Temperature Impacts On Heating Penalties Of Large Cool Roofs In Australian Climates – Final Report, Wenye Lin, Alan Green, Georgios Kokogiannakis, Paul Cooper
Faculty of Engineering and Information Sciences - Papers: Part B
This report outlines the key outcomes of research project RP1037u1 ‘Above-Roof Temperature Impacts on Heating Penalties of Large Cool Roofs in Australian Climates’, an extension to project RP1037 ‘Driving increased utilisation of cool roofs on large-footprint buildings’. The research has been focused on two key aspects of roof thermal performance that had, up until the time of writing, not been taken into account in most investigations into cool roof technology: 1. The condensation and evaporation of dew on the roof surface, and the effect this has on roof temperature by way of: a. The latent heat that is absorbed and …
Getting The Temperature Just Right Helps People With Dementia Stay Cool, Paul Cooper, Federico Tartarini, Richard Fleming
Getting The Temperature Just Right Helps People With Dementia Stay Cool, Paul Cooper, Federico Tartarini, Richard Fleming
Faculty of Engineering and Information Sciences - Papers: Part B
Everyone knows how bad it feels when the temperature is uncomfortably hot or cold. For most of us it doesn't last long as we can take simple steps to get comfortable, such as putting on clothes, opening a window, or switching on a heater. But what happens when you can't control the temperature where you live? This problem is faced by many residents of aged care facilities, and can be particularly difficult for those living with dementia. To find out how these residents cope we recently carried out a three-year research project on the effects of indoor environment in aged …
Influences Of Temperature And Grain Size On The Material Deformability In Microforming Process, Zhengyi Jiang, Jingwei Zhao, Haina Lu, Dongbin Wei, Kenichi Manabe, Xianming Zhao, Xiaoming Zhang, Di Wu
Influences Of Temperature And Grain Size On The Material Deformability In Microforming Process, Zhengyi Jiang, Jingwei Zhao, Haina Lu, Dongbin Wei, Kenichi Manabe, Xianming Zhao, Xiaoming Zhang, Di Wu
Faculty of Engineering and Information Sciences - Papers: Part A
This paper investigated the influences of temperature and grain size on the deformability of pure copper in micro compression process. Based on the dislocation theory, a constitutive model was proposed taking into account the influences of forming temperature, Hall-Petch relationship and surface layer model. Vacuum heat treatment was employed to obtain various grain sizes of cylindrical workpieces, and then laser heating method was applied to heat workpieces during microforming process. Finite element (FE) simulation was also performed, with simulated values agreed well with the experimental results in terms of metal flow stress. Both the FE simulated and experimental results indicate …
Indoor Air Temperature And Agitation Of Nursing Home Residents With Dementia, Federico Tartarini, Paul Cooper, Richard Fleming, Marijka Batterham
Indoor Air Temperature And Agitation Of Nursing Home Residents With Dementia, Federico Tartarini, Paul Cooper, Richard Fleming, Marijka Batterham
Faculty of Engineering and Information Sciences - Papers: Part B
This study aimed to determine the specific correlation between indoor air temperature and agitation of nursing home residents with dementia. Agitated behaviors of 21 residents, living in 1 nursing home, were assessed for a 10-month period using the Cohen-Mansfield Agitation Inventory (CMAI). The CMAI Total Frequency scores were found to increase significantly when indoor average temperatures deviated from 22.6°C. In addition, cumulative exposure to temperatures higher than 26°C and lower than 20°C was linearly correlated with CMAI Total Frequency scores. Results showed that agitated behaviors not only affected the person manifesting them but were found to be disruptive for other …
High Intrinsic Sensitivity Etched Polymer Fiber Bragg Grating Pair For Simultaneous Strain And Temperature Measurements, Kishore Bhowmik, Gang-Ding Peng, Yanhua Luo, Eliathamby Ambikairajah, Vedran Lovric, William R. Walsh, Ginu Rajan
High Intrinsic Sensitivity Etched Polymer Fiber Bragg Grating Pair For Simultaneous Strain And Temperature Measurements, Kishore Bhowmik, Gang-Ding Peng, Yanhua Luo, Eliathamby Ambikairajah, Vedran Lovric, William R. Walsh, Ginu Rajan
Faculty of Engineering and Information Sciences - Papers: Part A
A sensing configuration for simultaneous measurement of strain and temperature with enhanced intrinsic sensitivity based on a fiber Bragg grating (FBG) pair with one grating inscribed in the etched and the other in unetched polymer fiber region is demonstrated. A poly (methyl methacrylate) based single-mode polymer fiber is etched to different diameters, and it is observed that etching can lead to change in the material properties of the fiber, such as Young's modulus and thermal expansion coefficient, which can play a vital role in improving its intrinsic sensing capabilities. Thus, exploiting the different strain and temperature sensitivities exhibited by etched …
Influence Of Cr-Rich Oxide Scale On Sliding Wear Mechanism Of Ferritic Stainless Steel At High Temperature, Xiawei Cheng, Zhengyi Jiang, Buyung Kosasih, Hui Wu, Suzhen Luo, Laizhu Jiang
Influence Of Cr-Rich Oxide Scale On Sliding Wear Mechanism Of Ferritic Stainless Steel At High Temperature, Xiawei Cheng, Zhengyi Jiang, Buyung Kosasih, Hui Wu, Suzhen Luo, Laizhu Jiang
Faculty of Engineering and Information Sciences - Papers: Part A
The tribological tests of a ferritic stainless steel (FSS) 445 in contact with high-speed steel (HSS) were performed on a high-temperature pin-on-disc tribometer. Wear exhibited significant difference when the FSS 445 was oxidised with a Cr-rich oxide scale on the surface. The HSS pin displayed adhesive wear when there was no oxide scale on the stainless steel disc, and in the early stages, the coefficient of friction fluctuated significantly, but the level of wear changed as Cr2O3 particles formed. The wear was then reduced, and the coefficient of friction remained stable. The Cr-rich oxide scale which formed on the stainless …
Simultaneous Grain Growth And Grain Refinement In Bulk Ultrafine-Grained Copper Under Tensile Deformation At Room Temperature, Hai Liang Yu, Cheng Lu, Anh Kiet Tieu, Hui Jun Li, Ajit R. Godbole, Charlie Kong, Xing Zhao
Simultaneous Grain Growth And Grain Refinement In Bulk Ultrafine-Grained Copper Under Tensile Deformation At Room Temperature, Hai Liang Yu, Cheng Lu, Anh Kiet Tieu, Hui Jun Li, Ajit R. Godbole, Charlie Kong, Xing Zhao
Faculty of Engineering and Information Sciences - Papers: Part A
Grain growth and grain refinement behavior during deformation determine the strength and ductility of ultrafine-grained materials. We used asymmetric cryorolling to fabricate ultrafine-grained copper sheets with an average grain width of 230 nm and having a laminate structure. The sheets show a high-true failure strain of 1.5. Observation of the microstructure at the fracture surface reveals that ultrafine laminate-structured grains were simultaneously transformed into both equiaxed nanograins and coarse grains under tensile deformation at room temperature.
Transient Cfd Modelling Of Low-Temperature Spontaneous Heating Behaviour In Multiple Coal Stockpiles With Wind Forced Convection, Jian Zhang, Yuntao Liang, Ting X. Ren, Zhongwei Wang, Gongda Wang
Transient Cfd Modelling Of Low-Temperature Spontaneous Heating Behaviour In Multiple Coal Stockpiles With Wind Forced Convection, Jian Zhang, Yuntao Liang, Ting X. Ren, Zhongwei Wang, Gongda Wang
Faculty of Engineering and Information Sciences - Papers: Part A
Spontaneous heating of coal stockpile has long been a thermal dynamic hazard during coal storage, processing, and transport. A transient non-equilibrium thermal CFD model has been developed to study the low-temperature self-heating behaviour of coal in multiple stockpiles under different prevailing wind conditions. Modelling results from the initial steady wind flow simulation indicate that a wake region can be induced on the leeward side of each coal stockpile. Pressure coefficient drops when the wind stream encounters or leaves a stockpile and the pressure coefficient profiles of multiple stockpiles tend to have more resemblance with a wider spacing. The first stockpile …
High Temperature Oxidation Of Indefinite Chill Roll Material Under Dry And Humid Atmospheres, Liang Hao, Zhengyi Jiang, Zhixin Chen, Dongbin Wei, Xiawei Cheng, Jingwei Zhao, Ming Luo, Li Ma, Suzhen Luo, Laizhu Jiang
High Temperature Oxidation Of Indefinite Chill Roll Material Under Dry And Humid Atmospheres, Liang Hao, Zhengyi Jiang, Zhixin Chen, Dongbin Wei, Xiawei Cheng, Jingwei Zhao, Ming Luo, Li Ma, Suzhen Luo, Laizhu Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
In this paper, the isothermal oxidation of the indefinite chill (IC) roll is investigated by using a thermogravimetric analyzer (TGA) from 550 to 700 °C under dry and humid atmospheres. It is found that the oxidation kinetics follow a linear trend and the oxide scale consists of two layers after the oxidation in dry air but three layers in humid air above 600 °C. In dry air, the graphite is covered by the oxide scale above 650 °C. The water vapor accelerates the oxidation of the matrix and the graphite. The graphite is covered by the extension of the oxide …
Improved Superconducting Properties In The Mg11b2 Low Activation Superconductor Prepared By Low-Temperature Sintering, Fang Cheng, Yongchang Liu, Zongqing Ma, M Shahriar Al Hossain, Mehmet Somer
Improved Superconducting Properties In The Mg11b2 Low Activation Superconductor Prepared By Low-Temperature Sintering, Fang Cheng, Yongchang Liu, Zongqing Ma, M Shahriar Al Hossain, Mehmet Somer
Australian Institute for Innovative Materials - Papers
Mg11B2 has a great application prospect in the superconducting coils for fusion reactor as the "low activation superconductors". The un-doped Mg11B2 and Cu-doped Mg11B2 bulks using 11B as a boron precursor were fabricated by low-temperature sintering in present work. It was found that the prepared Mg11B2 low activation superconductors exhibit better Jc performance than all of other Mg11B2 samples reported in previous studies. As for Cu doped Mg11B2, minor Cu addition can obviously improve the Mg11B2 grain crystallization and reduce the amount of MgO impurity. Hence, improved grain connectivity and higher Jc at low fields is obtained in Cu doped …
Contribution Of Radicals And Ions In Catalyzed Growth Of Single-Walled Carbon Nanotubes From Low-Temperature Plasmas, Z Marvi, S Xu, G Foroutan, Kostya Ostrikov
Contribution Of Radicals And Ions In Catalyzed Growth Of Single-Walled Carbon Nanotubes From Low-Temperature Plasmas, Z Marvi, S Xu, G Foroutan, Kostya Ostrikov
Australian Institute for Innovative Materials - Papers
The growth kinetics of single-walled carbon nanotubes (SWCNTs) in a low-temperature, low-pressure reactive plasma is investigated using a multiscale numerical simulation, including the plasma sheath and surface diffusion modules. The plasma-related effects on the characteristics of SWCNT growth are studied. It is found that in the presence of reactive radicals in addition to energetic ions inside the plasma sheath area, the effective carbon flux, and the growth rate of SWCNT increase. It is shown that the concentration of atomic hydrogen and hydrocarbon radicals in the plasma plays an important role in the SWCNT growth. The effect of the effective carbon …
Superior Critical Current Density Obtained In Mg11b2 Low Activation Superconductor By Using Reactive Amorphous 11b And Optimizing Sintering Temperature, Fang Cheng, Yongchang Liu, Zongqing Ma, Huijun Li, Md Shahriar Hossain
Superior Critical Current Density Obtained In Mg11b2 Low Activation Superconductor By Using Reactive Amorphous 11b And Optimizing Sintering Temperature, Fang Cheng, Yongchang Liu, Zongqing Ma, Huijun Li, Md Shahriar Hossain
Australian Institute for Innovative Materials - Papers
The un-doped Mg11B2 and Cu-doped Mg11B2 bulks using 11B as a boron precursor were fabricated by solid-state reaction and sintered at different temperature in present work. By analyzing the sintering process, it was found that 11B original powder is more reactive and can react with Mg severely even at low temperature before Mg melting, which leads to the formation of refined Mg11B2 grains. Consequently, the critical current density of Mg11B2 sample prepared in this work is higher than that of natural MgB2. Furthermore, it was found that proper Cu addition …
Harvesting Temperature Fluctuations As Electrical Energy Using Torsional And Tensile Polymer Muscles, Shi Hyeong Kim, Marcio Dias Lima, Mikhail E. Kozlov, Carter S. Haines, Geoffrey M. Spinks, Shazed Aziz, Changsoon Choi, Hyeon Jun Sim, Xuemin Wang, Hongbing Lu, Dong Qian, John D. W Madden, Ray H. Baughman, Seon Jeong Kim
Harvesting Temperature Fluctuations As Electrical Energy Using Torsional And Tensile Polymer Muscles, Shi Hyeong Kim, Marcio Dias Lima, Mikhail E. Kozlov, Carter S. Haines, Geoffrey M. Spinks, Shazed Aziz, Changsoon Choi, Hyeon Jun Sim, Xuemin Wang, Hongbing Lu, Dong Qian, John D. W Madden, Ray H. Baughman, Seon Jeong Kim
Australian Institute for Innovative Materials - Papers
Diverse means have been deployed for harvesting electrical energy from mechanical actuation produced by low-grade waste heat, but cycle rate, energy-per-cycle, device size and weight, or cost have limited applications. We report the electromagnetic harvesting of thermal energy as electrical energy using thermally powered torsional and tensile artificial muscles made from inexpensive polymer fibers used for fishing line and sewing thread. We show that a coiled 27 μm-diameter nylon muscle fiber can be driven by 16.7 °C air temperature fluctuations to spin a magnetic rotor to a peak torsional rotation speed of 70 000 rpm for over 300 000 heating-cooling …
Harvesting Temperature Fluctuations As Electrical Energy Using Torsional And Tensile Polymer Muscles, Shi Hyeong Kim, Marcio Dias Lima, Mikhail E. Kozlov, Carter S. Haines, Geoffrey M. Spinks, Shazed Aziz, Changsoon Choi, Hyeon Jun Sim, Xuemin Wang, Hongbing Lu, Dong Qian, John D. W Madden, Ray H. Baughman, Seon Jeong Kim
Harvesting Temperature Fluctuations As Electrical Energy Using Torsional And Tensile Polymer Muscles, Shi Hyeong Kim, Marcio Dias Lima, Mikhail E. Kozlov, Carter S. Haines, Geoffrey M. Spinks, Shazed Aziz, Changsoon Choi, Hyeon Jun Sim, Xuemin Wang, Hongbing Lu, Dong Qian, John D. W Madden, Ray H. Baughman, Seon Jeong Kim
Australian Institute for Innovative Materials - Papers
Diverse means have been deployed for harvesting electrical energy from mechanical actuation produced by low-grade waste heat, but cycle rate, energy-per-cycle, device size and weight, or cost have limited applications. We report the electromagnetic harvesting of thermal energy as electrical energy using thermally powered torsional and tensile artificial muscles made from inexpensive polymer fibers used for fishing line and sewing thread. We show that a coiled 27 μm-diameter nylon muscle fiber can be driven by 16.7 °C air temperature fluctuations to spin a magnetic rotor to a peak torsional rotation speed of 70 000 rpm for over 300 000 heating-cooling …
Effect Of Temperature On Microstructure And Deformation Mechanism Of Fe-30mn-3si-4al Twip Steel At Strain Rate Of 700 S-1, Zhiping Xiong, Xue-Ping Ren, Jian Shu, Zhe-Lei Wang, Wei-Ping Bao, Shu-Xia Li
Effect Of Temperature On Microstructure And Deformation Mechanism Of Fe-30mn-3si-4al Twip Steel At Strain Rate Of 700 S-1, Zhiping Xiong, Xue-Ping Ren, Jian Shu, Zhe-Lei Wang, Wei-Ping Bao, Shu-Xia Li
Faculty of Engineering and Information Sciences - Papers: Part A
As twinning-induced plasticity (TWIP) steel is one potential material for shaped charge liner due to the combination of high strength and high plasticity, deformation mechanism at high strain rate and high temperature is required to study. Compression experiments of Fe-30Mn-3Si-4Al TWIP steel were conducted using a Gleeble-1500 thermal simulation machine and a split-Hopkinson pressure bar (SHPB) between 298 and 1073 K at strain rates of 10-3 and 700 s-1, respectively. Microstructures were observed using optical microscopy (OM) and transmission electron microscopy (TEM). Results show that flow stress and densities of deformation twins and dislocations decrease with increasing deformation temperature at …
Excellent Melt Lubrication Of Alkali Metal Polyphosphate Glass For High Temperature Applications, A Kiet Tieu, Shanhong Wan, Ning Kong, Qiang Zhu, Hongtao Zhu
Excellent Melt Lubrication Of Alkali Metal Polyphosphate Glass For High Temperature Applications, A Kiet Tieu, Shanhong Wan, Ning Kong, Qiang Zhu, Hongtao Zhu
Faculty of Engineering and Information Sciences - Papers: Part A
A new class of high temperature lubricant of inorganic alkali metal polyphosphate was developed for hot metal forming, which involved a fundamental knowledge of melt lubrication. At elevated temperature a 55% reduction in friction and a 50% decrease in wear were achieved by the presence of the molten polyphosphate lubrication, as well as the excellent anti-oxidation capability at the rubbing steel/steel interface, which closely correlated with the tribo-induced hierarchical structure at the rubbing interface. This inorganic polyphosphate lubricant can be called a smart polymeric material, which will be an eco-friendly alternative for high temperature applications. This journal is
Terahertz Spectroscopy Of 2,4-Dinitrotoluene Over A Wide Temperature Range (7−245 K), Lucia Lepodise, Josip Horvat, R A. Lewis
Terahertz Spectroscopy Of 2,4-Dinitrotoluene Over A Wide Temperature Range (7−245 K), Lucia Lepodise, Josip Horvat, R A. Lewis
Faculty of Engineering and Information Sciences - Papers: Part A
Previous THz spectroscopy of the TNT explosive precursor, 2,4-dinitrotoluene (DNT), has been restricted to room temperature (apart from one set of data at 11 K). Here, for the first time, we investigate the spectrum as the temperature is systematically varied, from 7 to 245 K. Many new features appear in the spectrum on cooling below room temperature. As well as the five absorption lines observed previously, we observe five additional lines. In addition, a new room-temperature line at 8.52 THz (281 cm−1) is observed. Six of the lines red-shift with temperature and four of them blue-shift. The blue shift is …
High Temperature Dislocation Structure And Nbc Precipitation In Three Ni-Fe-Nb-C Model Alloys, Andrii Kostryzhev, Parvez Mannan, Olexandra Marenych
High Temperature Dislocation Structure And Nbc Precipitation In Three Ni-Fe-Nb-C Model Alloys, Andrii Kostryzhev, Parvez Mannan, Olexandra Marenych
Faculty of Engineering and Information Sciences - Papers: Part A
In this original work, the dislocation structure and NbC precipitation were investigated in three Ni-based alloys (70Ni-Fe-0.331Nb-0.040C, 70Ni-Fe-0.851Nb-0.114C and 70Ni-Fe-1.420Nb-0.157C, wt%) thermomechanically processed in the temperature range of 1250-1075 °C. The dislocation structure inhomogeneity (dislocation networks and cell walls), which we observed in the middle and high Nb+C alloys, resulted from the dislocation pile-ups in the vicinity of >200 nm NbC particles. The dislocation density around >200 nm particles exceeded the average values by 5-7 times, and that in the cell walls might exceed the average values by 10 times. Twins and stacking faults were observed in all alloys after …
Significantly Enhanced Critical Current Density In Nano-Mgb2 Grains Rapidly Formed At Low Temperature With Homogeneous Carbon Doping, Yongchang Liu, Feng Lan, Zongqing Ma, Ning Chen, Huijun Li, Shaon Barua, Dipakkumar Patel, Md S. Hossain, S Acar, Jung Ho Kim, S X. Dou
Significantly Enhanced Critical Current Density In Nano-Mgb2 Grains Rapidly Formed At Low Temperature With Homogeneous Carbon Doping, Yongchang Liu, Feng Lan, Zongqing Ma, Ning Chen, Huijun Li, Shaon Barua, Dipakkumar Patel, Md S. Hossain, S Acar, Jung Ho Kim, S X. Dou
Australian Institute for Innovative Materials - Papers
High performance MgB2 bulks using carbon-coated amorphous boron as a boron precursor were fabricated by Cu-activated sintering at low temperature (600 °C, below the Mg melting point). Dense nano-MgB2 grains with a high level of homogeneous carbon doping were formed in these MgB2 samples. This type of microstructure can provide a stronger flux pinning force, together with depressed volatility and oxidation of Mg owing to the low-temperature Cu-activated sintering, leading to a significant improvement of critical current density (Jc) in the as-prepared samples. In particular, the value of Jc for the carbon-coated (Mg …
Improvement In Structure And Superconductivity Of Bulk Fese0.5te0.5 Superconductors By Optimizing Sintering Temperature, Ning Chen, Yongchang Liu, Zongqing Ma, Liming Yu, Huijun Li
Improvement In Structure And Superconductivity Of Bulk Fese0.5te0.5 Superconductors By Optimizing Sintering Temperature, Ning Chen, Yongchang Liu, Zongqing Ma, Liming Yu, Huijun Li
Australian Institute for Innovative Materials - Papers
Sintering temperature plays a vital role in the evolution of phase structure and microstructure in polycrystalline FeSe0.5Te0.5 bulks fabricated by the two-step sintering method, and thus significantly influences their superconducting properties. Elevated sintering temperature (600-700°C) at second step facilitates the substitution of Te into the superconducting phase, which leads to the increased lattice distortion and thus contributes to the enhancement of superconductivity (the value of Tc reaches 15.6K). At the same time, the accelerated growth of the superconducting grains and the improved homogeneity motivated by elevated sintering temperature serve as the main reason for the sharp superconducting transition.
Conductive Surfaces With Dynamic Switching In Response To Temperature And Salt, Alissa Hackett, Jenny Malmström, Paul J. Molino, Julien Gautrot, Hongrui Zhang, Michael J. Higgins, Gordon G. Wallace, David E. Williams, Jadranka Travas-Sejdic
Conductive Surfaces With Dynamic Switching In Response To Temperature And Salt, Alissa Hackett, Jenny Malmström, Paul J. Molino, Julien Gautrot, Hongrui Zhang, Michael J. Higgins, Gordon G. Wallace, David E. Williams, Jadranka Travas-Sejdic
Australian Institute for Innovative Materials - Papers
This work demonstrates polymer brushes grafted from conductive polymer films which display dynamic surface switching dependent on salt, temperature and electrode potential. The electroactivity presented by the conductive polymer and the responsiveness of the grafted brushes leads to an interface with multiple control parameters. Here, we demonstrate this concept by grafting of uncharged brushes of poly(ethylene glycol)methyl ether methacrylates from conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT), and observe a temperature- and salt-induced switch of brush conformation, and their effect on the electrochemistry of the material. The switching conditions can be tailored by copolymerizing monomers with different numbers of ethylene glycol units. In …
Influence Of Capping On The Atomistic Arrangement In Palladium Nanoparticles At Room Temperature, Gaston Corthey, Jimena A. Olmos-Asar, Gilberto Casillas, Marcelo M. Mariscal, Sergio Mejia-Rosales, Julio C. Azcarate, Eduardo Larios, Miguel Jose-Yacaman, Roberto Salvarezza, M Fonticelli
Influence Of Capping On The Atomistic Arrangement In Palladium Nanoparticles At Room Temperature, Gaston Corthey, Jimena A. Olmos-Asar, Gilberto Casillas, Marcelo M. Mariscal, Sergio Mejia-Rosales, Julio C. Azcarate, Eduardo Larios, Miguel Jose-Yacaman, Roberto Salvarezza, M Fonticelli
Australian Institute for Innovative Materials - Papers
The role that protecting molecules have on the way that palladium atoms arrange themselves in nanoparticles prepared at room temperature was studied by the analysis of aberration-corrected scanning transmission electron microscopy images and atomistic Langevin dynamics simulations. It was found that the arrangement of Pd atoms is less ordered in thiolate-protected nanoparticles than in amine-protected ones. The experimental and theoretical data showed that the disorder in ∼3 nm thiolate-protected particles is promoted by the strong S-Pd bond in the sulfide layer that surrounds the nanoparticles.
The Formation Of Nano-Layered Grains And Their Enhanced Superconducting Transition Temperature In Mg-Doped Fese0.9 Bulks, Feng Lan, Zongqing Ma, Yongchang Liu, Ning Chen, Qi Cai, Huijun Li, Shaon Barua, Dipakkumar Patel, Md Shahriar Hossain, Jung Ho Kim, S X. Dou
The Formation Of Nano-Layered Grains And Their Enhanced Superconducting Transition Temperature In Mg-Doped Fese0.9 Bulks, Feng Lan, Zongqing Ma, Yongchang Liu, Ning Chen, Qi Cai, Huijun Li, Shaon Barua, Dipakkumar Patel, Md Shahriar Hossain, Jung Ho Kim, S X. Dou
Australian Institute for Innovative Materials - Papers
To search a proper dopant to further improve superconductivity in 11 type Fe-based superconductors makes sense to both their superconductivity mechanism and possible technological applications. In present work, Mg doped FeSe polycrystalline bulks were obtained by a two-step solid-state reaction method. Even though there are many MgSe and iron impurities existing in the Mg heavy doped FeSe bulks, they exhibit obviously increased Tc compared to undoped FeSe sample. It was found that Mg addition has little effect on the crystal lattice parameters of superconducting beta-FeSe, whereas leads to the formation of nano-layered grain structure consisted of MgSe and beta-FeSe …
Achieving Single Domain Relaxor-Pt Crystals By High Temperature Poling, Fei Li, Linghang Wang, Li Jin, Zhuo Xu, Shujun Zhang
Achieving Single Domain Relaxor-Pt Crystals By High Temperature Poling, Fei Li, Linghang Wang, Li Jin, Zhuo Xu, Shujun Zhang
Australian Institute for Innovative Materials - Papers
Single domain relaxor-PT crystals are important from both fundamental and application viewpoints. Compared to domain engineered relaxor-PT crystals, however, single domain crystals are prone to cracking during poling. In this paper, based on the analysis of the cracking phenomenon in [001] poled tetragonal 0.25Pb(In0.5Nb0.5)O3-0.37Pb(Mg 1/3Nb2/3)O3-0.38PbTiO3 (PIN-PMN-PT) crystals, the non-180°ferroelastic domain switching was thought to be the dominant factor for cracking during the poling process. A high temperature poling technique, by which the domain switching can be greatly avoided, was proposed to achieve the single domain relaxor-PT crystals. By this poling approach, a quasi-single domain crystal was obtained without cracks. In …
Ultra-High Performance, High-Temperature Superconducting Wires Via Cost-Effective, Scalable, Co-Evaporation Process, Ho-Sup Kim, Sang-Soo Oh, Hong-Soo Ha, Dojun Youm, Seung-Hyun Moon, Jung Ho Kim, S X. Dou, Yoon-Uk Heo, Sung-Hun Wee, Amit Goyal
Ultra-High Performance, High-Temperature Superconducting Wires Via Cost-Effective, Scalable, Co-Evaporation Process, Ho-Sup Kim, Sang-Soo Oh, Hong-Soo Ha, Dojun Youm, Seung-Hyun Moon, Jung Ho Kim, S X. Dou, Yoon-Uk Heo, Sung-Hun Wee, Amit Goyal
Australian Institute for Innovative Materials - Papers
Long-length, high-temperature superconducting (HTS) wires capable of carrying high critical current, Ic, are required for a wide range of applications. Here, we report extremely high performance HTS wires based on 5 μm thick SmBa2Cu3O7 − δ (SmBCO) single layer films on textured metallic templates. SmBCO layer wires over 20 meters long were deposited by a cost-effective, scalable co-evaporation process using a batch-type drum in a dual chamber. All deposition parameters influencing the composition, phase, and texture of the films were optimized via a unique combinatorial method that is broadly applicable for co-evaporation of other promising complex materials containing several cations. …
Enhancement Of Transition Temperature In Fexse0.5te0.5 Film Via Iron Vacancies, J C. Zhuang, Wai K. Yeoh, Xiangyuan Cui, Jung Ho Kim, Dongqi Shi, Z X. Shi, S P. Ringer, Xiaolin Wang, S X. Dou
Enhancement Of Transition Temperature In Fexse0.5te0.5 Film Via Iron Vacancies, J C. Zhuang, Wai K. Yeoh, Xiangyuan Cui, Jung Ho Kim, Dongqi Shi, Z X. Shi, S P. Ringer, Xiaolin Wang, S X. Dou
Australian Institute for Innovative Materials - Papers
The effects of iron deficiency in Fe x Se0.5Te0.5 thin films (0.8 ≤ x ≤ 1) on superconductivity and electronic properties have been studied. A significant enhancement of the superconducting transition temperature (TC ) up to 21 K was observed in the most Fe deficient film (x = 0.8). Based on the observed and simulated structural variation results, there is a high possibility that Fe vacancies can be formed in the Fe x Se0.5Te0.5 films. The enhancement of TC shows a strong relationship with the lattice strain effect induced by Fe vacancies. Importantly, the presence of Fe vacancies alters the …
Development Of High Melting Temperature Microencapsulated Phase Change Material For Compacted Thermal Energy Storage Bed, Weiguang Su, Jo Darkwa, Georgios Kokogiannakis
Development Of High Melting Temperature Microencapsulated Phase Change Material For Compacted Thermal Energy Storage Bed, Weiguang Su, Jo Darkwa, Georgios Kokogiannakis
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper a novel high temperature microencapsulated phase change material (MEPCM) based on paraffin as the core material and MF resin as the shell material has been developed with the in-situ polymerization method for solar hot water storage application. The results showed that the type of emulsifier could influence core material content, the encapsulation efficiency as well as the latent heat capacity. Based on the results and analysis the study has shown that energy storage density could be increased by as much as 59% if 60wt% of MEPCM 1 was to be used in the proposed compacted MEPCM-water bed …
Dispersive Shock Waves In Colloids With Temperature Dependent Compressibility, Amirah Azmi, Timothy R. Marchant
Dispersive Shock Waves In Colloids With Temperature Dependent Compressibility, Amirah Azmi, Timothy R. Marchant
Faculty of Engineering and Information Sciences - Papers: Part A
The formation of a dispersive shock wave in a colloidal medium, due to an initial jump in the light intensity, is studied. The compressibility of the colloidal particles is modeled using a series in the particle density, or packing fraction, where the virial coefficients depend on the particle interaction model. Both the theoretical hard disk and sphere repulsive models, and a model with temperature dependent compressibility, are considered. Experimental results for the second virial coefficient show that it is temperature dependent and that the particle interactions can be either repulsive or attractive. These effects are modeled using a power-law relationship. …
Effect Of Holding Temperature And Time On Ferrite Formation In Dual Phase Steel Produced By Strip Casting, Zhiping Xiong, Andrii Kostryzhev, Nicole Stanford, Elena V. Pereloma
Effect Of Holding Temperature And Time On Ferrite Formation In Dual Phase Steel Produced By Strip Casting, Zhiping Xiong, Andrii Kostryzhev, Nicole Stanford, Elena V. Pereloma
Faculty of Engineering and Information Sciences - Papers: Part A
Conventional dual phase (DP) steel (0.08C-0.81Si-1.47Mn-0.03Al, wt. %) was manufactured by the laboratory simulation of strip casting. The effect of holding temperature and time on microstructure evolution was studied using a quench-deformation dilatometer. Microstructures were observed using optical and scanning electron microscopy. The results showed that the nose temperature of ferrite phase field is around 650 °C. The kinetics of ferrite formation is fast within the first 100 s of holding at this temperature, and then formation of ferrite continues at a slower rate until it reaches the fraction corresponding to that defined by the lever rule. 70~80 % ferrite …