Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Analysis (3)
- Water (3)
- Critical current (2)
- Critical state model (2)
- Dosimetry (2)
-
- MgB2 superconductor (2)
- Modeling (2)
- Modelling (2)
- Novel (2)
- Percolation (2)
- Rotary (2)
- Size-effect (2)
- Steel (2)
- Superconducting screening (2)
- Valve (2)
- 3d (1)
- Amplifiers (1)
- Anti (1)
- Applications (1)
- Applied (1)
- Approach (1)
- Artificial (1)
- Axis (1)
- Batch (1)
- Beam (1)
- Between (1)
- Biological effects of ionising particles (1)
- Blowtank (1)
- Bone (1)
- Brachytherapy (1)
Articles 1 - 30 of 54
Full-Text Articles in Engineering
In Vivo Dosimetry And Seed Localization In Prostate Brachytherapy With Permanent Implants, Anatoly B. Rosenfeld, Dean Cutajar, M. L. Lerch, G. J. Takacs, T. Braddock, V. L. Perevertailo, J. Bucci, J. Kearsley, M. Zaider, M. Zelefsky
In Vivo Dosimetry And Seed Localization In Prostate Brachytherapy With Permanent Implants, Anatoly B. Rosenfeld, Dean Cutajar, M. L. Lerch, G. J. Takacs, T. Braddock, V. L. Perevertailo, J. Bucci, J. Kearsley, M. Zaider, M. Zelefsky
Faculty of Engineering - Papers (Archive)
This paper reports on the development of an interactive, intraoperative dose planning system for seed implant brachytherapy in cancer treatment. This system involves in vivo dosimetry and the ability to determine implanted seed positions. The first stage of this project is the development of a urethral alarm probe to measure the dose along the urethra during a prostate brachytherapy treatment procedure. Ultimately, the system will be used to advise the physicians upon reaching a preset dose rate or dose after total seed decay in the urethra during the seed placement. The second stage is the development of a method and …
Calculation Of The Nonlinear Free-Carrier Absorption Of Terahertz Radiation In Semiconductor Heterostructures, C. Zhang, J. C. Cao
Calculation Of The Nonlinear Free-Carrier Absorption Of Terahertz Radiation In Semiconductor Heterostructures, C. Zhang, J. C. Cao
Faculty of Engineering - Papers (Archive)
Nonlinear absorption of terahertz waves by electrons in a semiconductor heterostructure is calculated. We solve the quantum transport equation for electrons strongly coupled to terahertz photons. The electrical field of the laser radiation is included exactly, and the electron-impurity interaction is included up to the second order. It is found that Joule heating of the electronic system due to impurity scattering decreases rapidly due to the strong electron-photon interaction. Our result is the dynamic equivalence of electron localization in a strong field. In the limit of weak radiation field, the current is linear in the field strength.
Laboratory Determination Of Efficiency Of Prefabricated Vertical Drains Incorporating Vacuum Preloading, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Laboratory Determination Of Efficiency Of Prefabricated Vertical Drains Incorporating Vacuum Preloading, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Faculty of Engineering - Papers (Archive)
This paper is mainly concerned with a laboratory study to investigate the effect of vacuum preloading. Two separate series of tests were conducted in a large-scale consolidation apparatus designed and installed at the University of Wollongong, with axial load increments of 30 and 50 kPa. The first series of tests were performed based on the conventional method (i.e. without vacuum preloading). For the second series, a vacuum pressure of 100 kPa was applied during the process of consolidation. The corresponding settlement behaviour was recorded and plotted. The extent of smear zone was examined by the variation of permeability of small …
Decoupling Transition Of Two Coherent Vortex Arrays Within The Surface Superconductivity State, Alexey Pan, P. Esquinazi
Decoupling Transition Of Two Coherent Vortex Arrays Within The Surface Superconductivity State, Alexey Pan, P. Esquinazi
Faculty of Engineering - Papers (Archive)
In magnetic fields applied within the angular range of the surface superconductivity state a magnetically anisotropic layered medium is created in structurally isotropic, sufficiently thick niobium films. Surface (Kulik) vortices residing in the superconducting sheaths on both main film surfaces in tilted fields are shown to undergo a decoupling transition from a coherent to an independent behavior, similar to the behavior observed for Giaever transformer. At the transition a feature in pinning properties is measured, which implies different pinning for the lattice of surface vortices coherently coupled through the normal layer and for two decoupled vortex arrays in the superconducting …
Superconducting Screening On Different Length Scales In High-Quality Bulk Mgb2 Superconductor, J. Horvat, Saeid Soltanian, Alexey Pan, Xiaolin Wang
Superconducting Screening On Different Length Scales In High-Quality Bulk Mgb2 Superconductor, J. Horvat, Saeid Soltanian, Alexey Pan, Xiaolin Wang
Faculty of Engineering - Papers (Archive)
High-quality bulk MgB2 exhibits a structure of voids and agglomeration of crystals on different length scales. Because of this, the superconducting currents percolate between the voids in the ensuing structure. Magnetic measurements reveal that the superconducting currents circulate on at least three different length scales, of ∼1 μm, ∼10 μm, and whole of the sample (∼millimeter). Each of these screenings contributes to the measured irreversible magnetic moment (Δm). The analysis of the field dependence of Δm for samples of subsequently decreasing size showed that the critical current obtained using the simple critical state model …
A Chandra X-Ray Observation Of A1991: The Late Stages Of Infall?, M. Sharma, B. R. Mcnamara, P. Nulsen, M. Owers, M. W. Wise, E. L. Blanton, C. L. Sarazin, F. N. Owen, L. P. David
A Chandra X-Ray Observation Of A1991: The Late Stages Of Infall?, M. Sharma, B. R. Mcnamara, P. Nulsen, M. Owers, M. W. Wise, E. L. Blanton, C. L. Sarazin, F. N. Owen, L. P. David
Faculty of Engineering - Papers (Archive)
We present results from a 38 ks Chandra X-ray observation of the z = 0.059 galaxy cluster A1991. The cluster has a bright X-ray core and a central temperature gradient that declines inward from 2.7 keV at 130 kpc to ≈1.6 keV at the cluster center. The radiative cooling time of the gas in the inner 10 kpc is about 0.5 Gyr, and it rises to 1 Gyr at a radius of 20 kpc. The cooling rate of the gas within the latter radius is ≲25 M⊙ yr-1. The Chandra ACIS-S3 image shows that the intracluster medium has an asymmetric …
Characterization Of Nanocrystalline Si-Mcmb Composite Anode Materials, G. X. Wang, J. Yao, Hua-Kun Liu
Characterization Of Nanocrystalline Si-Mcmb Composite Anode Materials, G. X. Wang, J. Yao, Hua-Kun Liu
Faculty of Engineering - Papers (Archive)
Nanocrystalline Si-mesocarbon microbeads ~MCMB! composite anode materials were prepared by ballmilling. Scanning electron microscopic observation showed that the spherical shape of MCMB particles can be retained via moderate ballmilling. Ballmilling conditions have an impact on the capacity and cyclability of nanocrystalline Si-MCMB composites. The optimized Si-MCMB composite anode demonstrated a reversible capacity of 1066 mAh/g with good cyclability. A reaction model has been proposed to explain the reaction mechanisms of lithium insertion and extraction in the Si-MCMB electrode.
Oxygen Vacancy Ordering And Magnetism In The Rare Earth Stabilised Perovskite Form Of “Srco3-D, M. James, D. Cassidy, K. F. Wilson, J. Horvat, R. L. Withers
Oxygen Vacancy Ordering And Magnetism In The Rare Earth Stabilised Perovskite Form Of “Srco3-D, M. James, D. Cassidy, K. F. Wilson, J. Horvat, R. L. Withers
Faculty of Engineering - Papers (Archive)
We have demonstrated that SrCoO3-d can be stabilised into phase pure perovskite forms by the introduction of small amounts ~5% of certain rare earth ions (Sm3+ - Yb3+). At the same doping levels, La3+ and Pr3+ crystallise with the same isostructural trigonal structure as SrCoO3-d; while the Nd3+ composition shows a mixture of both structure types. Powder X-ray diffraction showed only a simple cubic perovskite structure, however a combination of electron and neutron diffraction has revealed a tetragonal (P4/mmm) ap x ap x 2ap superstructure. Strontium and the rare earth ions are disordered over a single site, while the oxygen …
A Systematic Study Of Radio-Induced X-Ray Cavities In Clusters, Groups, And Galaxies, L. Birzan, D. A. Rafferty, B. R. Mcnamara, M. W. Wise, P. Nulsen
A Systematic Study Of Radio-Induced X-Ray Cavities In Clusters, Groups, And Galaxies, L. Birzan, D. A. Rafferty, B. R. Mcnamara, M. W. Wise, P. Nulsen
Faculty of Engineering - Papers (Archive)
We present an analysis of 16 galaxy clusters, one group, and one galaxy drawn from the Chandra Data Archive. These systems possess prominent X-ray surface brightness depressions associated with cavities or bubbles that were created by interactions between powerful radio sources and the surrounding hot gas. The central galaxies in these systems harbor radio sources with luminosities ranging between ∼2 × 1038 and 7 × 1044 ergs s-1. The cavities have an average radius of ∼10 kpc, and they lie at an average projected distance of ∼20 kpc from the central galaxy. The minimum energy associated with the cavities ranges …
Virgin Magnetization Of A Magnetically Shielded Superconductor Wire: Theory And Experiment, Y. A. Genenko, S. V. Yampolskii, Alexey Pan
Virgin Magnetization Of A Magnetically Shielded Superconductor Wire: Theory And Experiment, Y. A. Genenko, S. V. Yampolskii, Alexey Pan
Faculty of Engineering - Papers (Archive)
On the basis of exact solutions to the London equation, the magnetic moment of a type II superconductor filament surrounded by a soft-magnet environment is calculated and the procedure of extracting the superconductor contribution from magnetic measurements is suggested. A comparison of theoretical results with experiments on MgB2/Fe wires allows the estimation of the value of critical current for the first magnetic flux penetration.
Optimum Dynamic Balancing Of Planar Parallel Manipulators, G. Alici, B. Shirinzadeh
Optimum Dynamic Balancing Of Planar Parallel Manipulators, G. Alici, B. Shirinzadeh
Faculty of Engineering - Papers (Archive)
This paper presents a methodology for optimum dynamic balancing of planar parallel manipulators typified with a variable speed 2 DOF parallel manipulator articulated with revolute joints. The dynamic balancing is formulated as an optimisation problem such that a sum-squared values of bearing forces, driving torques, shaking moment, and the deviation of the angular momentum from its mean value are minimized throughout an operation range of the manipulator, provided that a set of balancing constraints consisting of the shaking force balancing conditions, the sizes of some inertial and geometric parameters are satisfied. Sets of optimisation results corresponding to various combinations of …
Mathematical Modeling And Field Evaluation Of Embankment Stabilized With Vertical Drains Incorporating Vacuum Preloading, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Mathematical Modeling And Field Evaluation Of Embankment Stabilized With Vertical Drains Incorporating Vacuum Preloading, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Faculty of Engineering - Papers (Archive)
This study presents the analytical modeling of vertical drains incorporating vacuum preloading in both axisymmetric and plane strain conditions. The effectiveness of vacuum pressure (i.e. both constant vacuum pressure and varied vacuum pressure) applied along the drain is considered. A multidrain plane strain model is employed to analyse an embankment at the site of Second Bangkok International Airport (SBIA) stabilised with prefabricated vertical drains. At this site, a significantly reduced height of sand surcharge was applied by reducing the pore pressures through vacuum preloading. The results of FEM analysis confirm the efficiency of vacuum preloading in comparison with the conventional …
Structural And Magnetic Properties Of Y0.33sr0.67coo2.79, D. J. Goossens, K. F. Wilson, M. James, A. J. Studer, Xiaolin Wang
Structural And Magnetic Properties Of Y0.33sr0.67coo2.79, D. J. Goossens, K. F. Wilson, M. James, A. J. Studer, Xiaolin Wang
Faculty of Engineering - Papers (Archive)
The perovskite-based oxide Y0.33Sr0.67CoO2.79 has been magnetically and structurally characterized. The material shows a unit cell of 23234 simple perovskite cubes with space group I4/mmm. This is a different structure to that observed in the much-studied (La,Sr)CoO3 oxides. Oxygen stoichiometry is established through thermogravimetric analysis and correlated with ac and dc magnetic measurements and magnetic neutron diffraction. Hysteresis with field and temperature is observed in the dc magnetization measurements, yet the absence of an imaginary component in the ac susceptibility suggests a time-independent cause for these effects such as the presence of independently ordering ferromagnetic regions due to compositional inhomogeneities …
Active Control Of Cross Wind Response Of 76-Story Tall Building Using A Fuzzy Controller, B. Samali, M. Al-Dawod, K. C. Kwok, Fazel Naghdy
Active Control Of Cross Wind Response Of 76-Story Tall Building Using A Fuzzy Controller, B. Samali, M. Al-Dawod, K. C. Kwok, Fazel Naghdy
Faculty of Engineering - Papers (Archive)
This paper focuses on the benchmark problem application regarding the vibration control of tall buildings under cross wind excitation. The building under consideration is the 76-story, 306-m tall reinforced concrete office tower proposed for the city of Melbourne, Australia. The adopted control scheme consists of an active tuned mass damper (ATMD) where the control action is achieved by a fuzzy logic controller (FLC). The main advantage of the FLC is its inherent robustness and ability to handle any nonlinear behavior of the structure and the fact that its implementation does not require a mathematical model of the structure. This benchmark …
Asymmetric Kernel Regression, M. Mackenzie, K. Tieu
Asymmetric Kernel Regression, M. Mackenzie, K. Tieu
Faculty of Engineering - Papers (Archive)
Kernel regression is one model that has been applied to explain or design radial-basis neural networks. Practical application of the kernel regression method has shown that bias errors caused by the boundaries of the data can seriously effect the accuracy of this type of regression. This paper investigates the correction of boundary error by substituting an asymmetric kernel function for the symmetric kernel function at data points close to the boundary. The asymmetric kernel function allows a much closer approach to the boundary to be achieved without adversely effecting the noise-filtering properties of the kernel regression.
Local Buckling Of Steel Plates In Double Skin Composite Panels Under Biaxial Compression And Shear, Q. Q. Liang, B. Uy, H. D. Wright, M. A. Bradford
Local Buckling Of Steel Plates In Double Skin Composite Panels Under Biaxial Compression And Shear, Q. Q. Liang, B. Uy, H. D. Wright, M. A. Bradford
Faculty of Engineering - Papers (Archive)
Steel plates in double skin composite (DSC) panels are restrained by a concrete core and welded stud shear connectors at discrete positions. Local buckling of steel plates in DSC panels may occur in a unilateral mode between stud shear connectors when subjected to combined states of stresses. This paper studies the local and postlocal buckling strength of steel plates in DSC panels under biaxial compression and in-plane shear by using the finite element method. Critical local buckling interaction relationships are presented for steel plates with various boundary conditions that include the shear stiffness effects of stud shear connectors. A geometric …
A Two-Stage Decision Support Tool For Restoring Tidal Flows To Flood Mitigation Drains Affected By Acid Sulfate Soil: Case Study Of Broughton Creek Floodplain, New South Wales, Australia, W. Glamore, Buddhima Indraratna
A Two-Stage Decision Support Tool For Restoring Tidal Flows To Flood Mitigation Drains Affected By Acid Sulfate Soil: Case Study Of Broughton Creek Floodplain, New South Wales, Australia, W. Glamore, Buddhima Indraratna
Faculty of Engineering - Papers (Archive)
A 2-stage flood estimation and water quality decision support tool (DST) was developed, calibrated, and applied to a field site in south-eastern New South Wales (NSW) to simulate tidal restoration in a flood mitigation drain affected by acid sulfate soils leachate. The first stage of the DST employes a digital terrain map, geographic information tools, and measured water levels to calculate drain water overtopping due to tidal variations. Simulations using the GIS technique at the study site indicated that the primary drainage network can safely accommodate full tidal flushing (0.91 m AHD or a 58% increase), whereas at the same …
Optical Absorption In Terahertz-Driven Quantum Wells, X. W. Mi, J. C. Cao, C. Zhang
Optical Absorption In Terahertz-Driven Quantum Wells, X. W. Mi, J. C. Cao, C. Zhang
Faculty of Engineering - Papers (Archive)
The optical absorption spectra in a quantum well driven both by an intense terahertz (THz) and by an optical pulse are theoretically investigated within the theory of density matrix. We found that the optical absorption spectra and the splitting of the excitonic peaks splitting can be controlled by changing the THz field intensity and/or frequency. The Autler–Towns splitting is a result of the THz nonlinear dynamics of confined excitons, which is in agreement with the experiments. In addition, the dependence of the optical absorption on the quantum well width and the carrier density is also discussed.
Verification Of Monte Carlo Calculations In Fast Neutron Therapy Using Silicon Microdosimetry, I. Cornelius, Anatoly B. Rosenfeld
Verification Of Monte Carlo Calculations In Fast Neutron Therapy Using Silicon Microdosimetry, I. Cornelius, Anatoly B. Rosenfeld
Faculty of Engineering - Papers (Archive)
Silicon microdosimetry measurements in Fast Neutron Therapy were simulated using the GEANT4 Monte Carlo toolkit. The possibility of using silicon microdosimeters for verification of Monte Carlo based treatment planning systems in hadron therapy is suggested.
Nanodosimetric Cluster Size Distributions Of Therapeutic Proton Beams, Andrew J. Wroe, Reinhard Schulte, Vladimir Bashkirov, Anatoly B. Rosenfeld, Brian Keeney, Patrick Spradlin, Hartmut F. W Sadrozinski, Bernd Grosswendt
Nanodosimetric Cluster Size Distributions Of Therapeutic Proton Beams, Andrew J. Wroe, Reinhard Schulte, Vladimir Bashkirov, Anatoly B. Rosenfeld, Brian Keeney, Patrick Spradlin, Hartmut F. W Sadrozinski, Bernd Grosswendt
Faculty of Engineering - Papers (Archive)
As we move into the new millennium, it is important that we improve our understanding of radiation effects on humans and nanoelectronic systems. This understanding is essential in a number of areas including radiation therapy for cancer treatment and extended human presence in outer space. Nanodosimetry in low-pressure gases enables measurement of the energy deposition of ionizing radiation on a scale equivalent to the dimensions of the DNA molecule. This is extremely important for not only biological applications but also electronic applications, as the effect of radiation on nanoelectronics needs to be determined before they are installed and deployed in …
In Vivo Dosimetry And Seed Localization In Prostate Brachytherapy With Permanent Implants, Anatoly B. Rosenfeld, Dean Cutajar, M. L. Lerch, G. J. Takacs, J. Brady, T. Braddock, V. Perevertailo, J. Bucci, J. Kersley, M. Zaider, M. Zelefsky
In Vivo Dosimetry And Seed Localization In Prostate Brachytherapy With Permanent Implants, Anatoly B. Rosenfeld, Dean Cutajar, M. L. Lerch, G. J. Takacs, J. Brady, T. Braddock, V. Perevertailo, J. Bucci, J. Kersley, M. Zaider, M. Zelefsky
Faculty of Engineering - Papers (Archive)
This paper reports on the development of an interactive, intraoperative dose planning system for seed implant brachytherapy in cancer treatment. This system involves in vivo dosimetry and the ability to determine implanted seed positions. The first stage of this project is the development of a urethral alarm probe to measure the dose along the urethra during a prostate brachytherapy treatment procedure. Ultimately, the system will be used to advise the physicians upon reaching a preset dose rate or dose after total seed decay in the urethra during the seed placement. The second stage is the development of a method and …
Effect Of Sample Size On Magnetic Jc For Mgb2 Superconductor, J. Horvat, Saeid Soltanian, Xiaolin Wang, S. X. Dou
Effect Of Sample Size On Magnetic Jc For Mgb2 Superconductor, J. Horvat, Saeid Soltanian, Xiaolin Wang, S. X. Dou
Faculty of Engineering - Papers (Archive)
A strong effect of sample size on magnetic Jc(H) was observed for bulk MgB2 when Jc is obtained directly from the critical state model. Thus obtained zero-field Jc (Jc0) decreases strongly with the sample size, attaining a constant value for the samples larger than a few millimetres. On the other hand, the irreversibility field (Hirr) defined at Jc = 100 A/cm2 increases with the sample size. The decrease of Jc0 is described in terms of voids in the bulk MgB2 samples and superconducting screening around the cells of superconducting material between these voids (35 micro-m), because of concentration of the …
Nanoscale-Sic Doping For Enhancing Jc And Hc2 In Superconducting Mgb2, S X. Dou, V. Braccini, Saeid Soltanian, R. Klie, Y. Zhu, S. Li, Xiaolin Wang, D. Larbalestier
Nanoscale-Sic Doping For Enhancing Jc And Hc2 In Superconducting Mgb2, S X. Dou, V. Braccini, Saeid Soltanian, R. Klie, Y. Zhu, S. Li, Xiaolin Wang, D. Larbalestier
Faculty of Engineering - Papers (Archive)
The effect of nanoscale-SiC doping of MgB2 was investigated in comparison with undoped, clean-limit, and Mg-vapor-exposed samples using transport and magnetic measurements. It was found that there are two distinguishable but related mechanisms that control the critical current-density-field JcsHd behavior: increase of upper critical field Hc2 and improvement of flux pinning. There is a clear correlation between the critical temperature Tc, the resistivity r, the residual resistivity ratio RRR=Rs300 Kd /Rs40 Kd, the irreversibility field H*, and the alloying state in the samples. The Hc2 is about the same within the measured field range for both the Mg-vapor-treated and the …
Effects Of Nanosized Adsorbing Material On Electrochemical Properties Of Sulfur Cathodes For Li/S Secondary Batteries, M. S. Song, S. C. Han, H. S. Kim, J. H. Kim, K. T. Kim, Y. M. Kang, H. J. Ahn, S. X. Dou, J. Y. Lee
Effects Of Nanosized Adsorbing Material On Electrochemical Properties Of Sulfur Cathodes For Li/S Secondary Batteries, M. S. Song, S. C. Han, H. S. Kim, J. H. Kim, K. T. Kim, Y. M. Kang, H. J. Ahn, S. X. Dou, J. Y. Lee
Faculty of Engineering - Papers (Archive)
In order to prevent polysulfide dissolution into liquid electrolytes and to promote the Li/S redox reaction (16Li 1 S8 $ Li2Sn $ Li2S), nanosized Mg0.6Ni0.4O, which has the catalytic effect of chemical bond dissociating and is expected to have an adsorbing effect due to the effect of retaining liquid electrolyte of MgO in a Li/iron sulfide secondary battery,16 was prepared by the sol-gel method as an electrochemically inactive additive for an elemental sulfur cathode for Li/S rechargeable batteries. The Li/S battery using an elemental sulfur cathode with a nanosized Mg0.6Ni0.4O added showed the improvement of not only the discharge capacity …
Characterization Of Limxfe1–Xpo4 (M = Mg, Zr, Ti) Cathode Materials Prepared By The Sol-Gel Method, G. X. Wang, S. Bewlay, J. Yao, J. H. Ahn, S. X. Dou, Hua-Kun Liu
Characterization Of Limxfe1–Xpo4 (M = Mg, Zr, Ti) Cathode Materials Prepared By The Sol-Gel Method, G. X. Wang, S. Bewlay, J. Yao, J. H. Ahn, S. X. Dou, Hua-Kun Liu
Faculty of Engineering - Papers (Archive)
A series of LiMxFe12xPO4 (M 5 Mg,Zr,Ti) phosphates were synthesized via a sol-gel method. Transmission electron microscopy observations show that LiMxFe12xPO4 particles consist of nanosize crystals, ranging from 40 to 150 nm. High-resolution TEM analysis reveals that a layer of amorphous carbon was coated on the surface of the LiMxFe12xPO4 particles, which substantially increases the electronic conductivity of LiMxFe12xPO4 electrodes. The doped LiMxFe12xPO4 powders are phase pure. Near full capacity ~170 mAh/g! was achieved at the C/8 rate at room temperature for LiMxFe12xPO4 electrodes. The doped LiMxFe12xPO4 electrodes demonstrated better electrochemical performance than that of undoped LiFePO4 at high rate.
Cryogenic Magnetic Field Sensor Based On The Magnetoresistive Effect In Bulk Bi2212 + Usr2cao6, M. Ionescu, B. Winton, Tania M. Silver, S. X. Dou, R. Ramer
Cryogenic Magnetic Field Sensor Based On The Magnetoresistive Effect In Bulk Bi2212 + Usr2cao6, M. Ionescu, B. Winton, Tania M. Silver, S. X. Dou, R. Ramer
Faculty of Engineering - Papers (Archive)
A large magnetoresistive (MR) effect was observed in melt-textured (MT) Bi2212 in which USr2CaO6 was added in a proportion of 6 wt %. The resistivity measurements of MT Bi2212 + 6 wt % USr2CaO6 show high sensitivity to applied dc fields, as compared to pure Bi2212, in particular at low fields, below 3 T, and in a temperature range between 45 K and 85 K. In this temperature range, the MR effect of MT Bi2212 + 6 wt % USr2CaO6 is two orders of magnitude larger than the MR effect in pure Bi2212, and display a maximum that may be …
Growth, Microstructures, And Superconductivity Of Bi2–Xpbxsr2ca1–Ygdycu2o8 + Z Single Crystals, Xiaolin Wang, E. Takayama-Muromachi, Aihua Li, Z. Cheng, S. Keshavarzi, M. J. Qin, S. X. Dou
Growth, Microstructures, And Superconductivity Of Bi2–Xpbxsr2ca1–Ygdycu2o8 + Z Single Crystals, Xiaolin Wang, E. Takayama-Muromachi, Aihua Li, Z. Cheng, S. Keshavarzi, M. J. Qin, S. X. Dou
Faculty of Engineering - Papers (Archive)
Bi2–xPbxSr2Ca1–yGdyCu2O8 + delta (x = 0.34 and y = 0.18, 0.34) crystals were grown by the self-flux method. The crystals have a cleavage thickness of only half unit cell up to two unit cells with Tc only dropping 20 K as y is increased from 0.18 to 0.34 for as-grown crystals. However, Tc increased to almost the same value of about 80 K after annealing in air regardless of the Gd doping levels. The co-doping produced enhanced flux pinning compared to the sole Gd doping. A secondary peak effect presented in crystals with x = 0.34 and y = 0.34 …
Overcritical State In Superconducting Round Wires Sheathed By Iron, Alexey Pan, S X. Dou
Overcritical State In Superconducting Round Wires Sheathed By Iron, Alexey Pan, S X. Dou
Faculty of Engineering - Papers (Archive)
Magnetic measurements carried out on MgB2 superconducting round wires have shown that the critical current density Jc(Ba) in wires sheathed by iron can be significantly higher than that in the same bare (unsheathed) wires over a wide applied magnetic field Ba range. The magnetic behavior is, however, strongly dependent on the magnetic history of the sheathed wires, as well as on the wire orientation with respect to the direction of the applied field. The behavior observed can be explained by magnetic interaction between the soft magnetic sheath and superconducting core, which can result in a redistribution of supercurrents in the …
Origin Of Paramagnetic Magnetization In Field-Cooled Yba2cu3o7–Delta Films, D. A. Luzhbin, A. V. Pan, V. A. Komashko, V. S. Flis, V. M. Pan, S. X. Dou, P. Esquinazi
Origin Of Paramagnetic Magnetization In Field-Cooled Yba2cu3o7–Delta Films, D. A. Luzhbin, A. V. Pan, V. A. Komashko, V. S. Flis, V. M. Pan, S. X. Dou, P. Esquinazi
Faculty of Engineering - Papers (Archive)
Temperature dependences of the magnetic moment have been measured in YBa2Cu3O72d thin films over a wide magnetic-field range (5
Sample-Size Dependence Of The Magnetic Critical Current Density In Mgb2 Superconductors, M. J. Qin, S. Keshavarzi, Saeid Soltanian, Xiaolin Wang, Hua-Kun Liu, S. X. Dou
Sample-Size Dependence Of The Magnetic Critical Current Density In Mgb2 Superconductors, M. J. Qin, S. Keshavarzi, Saeid Soltanian, Xiaolin Wang, Hua-Kun Liu, S. X. Dou
Faculty of Engineering - Papers (Archive)
Sample size dependent magnetic critical current density has been observed in magnesium diboride superconductors. At high fields, larger samples provide higher critical current densities, while at low fields, larger samples give rise to lower critical current densities. The explanation for this surprising result is proposed in this study based on the electric field generated in the superconductors. The dependence of the current density on the sample size has been derived as a power law j}R1/n @n is the n factor characterizing E2j curve E 5Ec( j/ jc)n]. This dependence provides one with a method to derive the n factor and …