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Full-Text Articles in Engineering
High Field Performance Of Nano-Diamond Doped Mgb2 Superconductor, Arpita Vajpayee, V P. Awana, H Kishan, Anant Narlikar, G L. Bhalla, Xiaolin Wang
High Field Performance Of Nano-Diamond Doped Mgb2 Superconductor, Arpita Vajpayee, V P. Awana, H Kishan, Anant Narlikar, G L. Bhalla, Xiaolin Wang
Australian Institute for Innovative Materials - Papers
The results from magnetotransport and magnetization of nanodiamond doped MgB2-nDx are reported. Superconducting transition temperature (Tc) is not affected significantly by x up to x =0.05 and latter decreases slightly for higher x>0.05. R(T) vs H measurements show higher Tc values under same applied magnetic fields for the nanodiamond added samples, resulting in higher estimated Hc2 values. From the magnetization measurements, it was found that irreversibility field value Hirr for the pristine sample is 7.5 T at 4 K and the same is increased to 13.5 T for 3 wt % …
Online Optimal Control Of The Central Chilling System In A Super High-Rise Commercial Building, Shengwei Wang, Zhenjun Ma
Online Optimal Control Of The Central Chilling System In A Super High-Rise Commercial Building, Shengwei Wang, Zhenjun Ma
Faculty of Engineering - Papers (Archive)
This paper presents the online optimal control strategies of the central chilling system in a super high-rise building in Hong Kong. The work presented aims at developing a package of optimal control strategies and evaluating their energy saving potentials and finally implementing these strategies in the building to enhance its energy efficiency. Based on testing the effects of interactions within the cooling water system and chilled water system on the system operation performance, the optimal control strategies for the cooling water system and variable speed pumps with different installations in the secondary chilled water system are developed. These strategies are …
High Spatial Resolution Fibre -Optic Fizeau Interferometric Strain Sensor Based On An In-Fiber Spherical Microcavity, Enbang Li, Gang-Ding Peng, Xin Ding
High Spatial Resolution Fibre -Optic Fizeau Interferometric Strain Sensor Based On An In-Fiber Spherical Microcavity, Enbang Li, Gang-Ding Peng, Xin Ding
Faculty of Engineering and Information Sciences - Papers: Part A
We present a fiber-optic Fizeau interferometric strain sensor consisting of an in-fiber spherical microcavity of 39um in diameter. The spherical microcavity was formed by splicing a normal single-mode fiber with a hollow-core photonic crystal fiber. We demonstrate that strain sensing can be realized by using the interference between the light signals reflected by the front and rear surfaces of the sphere. Experiments have shown that the strain sensor has a strain sensitivity of 3.36um/ue and a temperature sensitivity of 1.35um/°C.
Development Of Hydraulic Fracturing In High Stress Conditions In Australian Underground Coal Mines, Dennis John Black, Naj Aziz
Development Of Hydraulic Fracturing In High Stress Conditions In Australian Underground Coal Mines, Dennis John Black, Naj Aziz
Faculty of Engineering and Information Sciences - Papers: Part A
Hydraulic fracturing has been used extensively in the petroleum and coalbed methane industries as a means of improving access to the reservoir and thereby enhancing production. In the Australian coal mining industry there has been an aversion to the use of hydraulic fracturing. One of the main reasons for the lack of application of this technology has been the perceived risk of damage to the strata and the resulting impact on future mining operations. A number of Australian mines are progressing toward areas where gas drainage is becoming increasingly difficult and these mines are seriously considering the use of hydraulic …
Subterahertz Josephson Plasma Emission In Layered High-T-C Superconducting Tunnel Junctions, Gustavo A. Alvarez, T Puzzer, Xiaolin Wang, Roger A. Lewis, Carey A. Freeth, S. X. Dou
Subterahertz Josephson Plasma Emission In Layered High-T-C Superconducting Tunnel Junctions, Gustavo A. Alvarez, T Puzzer, Xiaolin Wang, Roger A. Lewis, Carey A. Freeth, S. X. Dou
Faculty of Engineering - Papers (Archive)
We investigated the emission of subterahertz frequency electromagnetic radiation from high-TC superconducting c-axis NdBa2Cu3O7−8/PrBa2Cu3O7−8/NdBa2Cu3O7−8 trilayer thin film tunneling junctions when external electric and magnetic fields are applied. The current-voltage characteristics under applied ab-plane magnetic fields H (up 8 T) exhibit well defined steps, Vn, such that eVn -hwp / (2n), where the plasma frequency wp-0.4 THz and n=1,2,3, . . . .. These steps may be interpreted using Josephson plasma dynamics. The applied voltage creates oscillating currents via the Josephson coupling energy EJ (EJ=hIJ /4e, where IJ is the Josephson current and h is Planck’s constant) and the charge energy …
Terahertz Zeeman Spectroscopy Of Boron In Germanium To High Magnetic Fields, Rodney E. Vickers, Roger A. Lewis, Peter Fisher, Yong-Jie Wang
Terahertz Zeeman Spectroscopy Of Boron In Germanium To High Magnetic Fields, Rodney E. Vickers, Roger A. Lewis, Peter Fisher, Yong-Jie Wang
Faculty of Engineering - Papers (Archive)
The fundamental absorption lines of substitutional boron acceptor impurity in germanium, which lie between 1 and 3 THz, now have been measured in magnetic fields to 18 T, greatly extending the reach of both previous experiments (to 7 T)and theory (to 10 T). The Faraday configuration was employed with the magnetic field B||. Unexpected behavior has been observed relating to the magnetic-field-induced splitting of the ground and first two excited states (all of which are fourfold degenerate): (a)One pair of Zeeman ground states splits at only half the rate predicted with field; this behavior continues to high field. The other …
Bond Of High Strength Concrete With High Strength Reinforcing Steel, Muhammad N. S Hadi
Bond Of High Strength Concrete With High Strength Reinforcing Steel, Muhammad N. S Hadi
Faculty of Engineering - Papers (Archive)
This paper presents a study about the bond of high strength concrete with high strength steel. Fourteen pull out tests were carried out to determine the bond. The concrete strength was about 70 MPa and the steel was a 500 MPa grade. Bar diameters used were 12, 16, 20, 25, 28, 32 and 36 mm. In order to investigate the effect of cover, each test was done twice, once in a 240 mm diameter concrete cylinder and the second in a 300 mm diameter cylinder. Based on the test results a new equation representing the bond is proposed.
High-Field Far-Infrared Magnetospectroscopy Of Cobaltite/Manganites, Roger A. Lewis, Feng Gao
High-Field Far-Infrared Magnetospectroscopy Of Cobaltite/Manganites, Roger A. Lewis, Feng Gao
Faculty of Engineering - Papers (Archive)
No abstract provided.
Orientation Dependence Of The Optical Spectra In Graphene At High Frequencies, Chao Zhang, Lei Chen, Zhongshui Ma
Orientation Dependence Of The Optical Spectra In Graphene At High Frequencies, Chao Zhang, Lei Chen, Zhongshui Ma
Faculty of Engineering - Papers (Archive)
On the basis of the Kubo formula we evaluated the optical conductivity of a graphene sheet. The fullbehavior of frequency as well as temperature dependence of the optical conductivity is presented.We show that the anisotropy of conductivity can be significantly enhanced at high frequencies. The photon absorption depends on the field polarization direction. At the frequency comparable to the maximum separation of upper and lower bands the photon-induced conduction of electrons is strongly suppressed if the polarization of field is along the zigzag direction. The corresponding optical conductivity is several orders of magnitude weaker than that when the light is …