11,875 research outputs found
Lord Atkin: from Queensland to the House of Lords - Liversidge v Anderson [1942] AC 206
No full textResearch Background:By invitation, I contributed to the Supreme Court Working Party that produced the free public Exhibition, Lord Atkin: from Queensland to the House of Lords. The Exhibition refines a legal history question – Lord Atkin’s Anglo-Australian significance as a renowned twentieth-century Law Lord. Chaired by the Honourable Justice Peter Applegarth, the Working Party integrated seven components within the Exhibition to develop, as a new medium, a walk-around installation at the Supreme Court Library Queensland from 29.11.17 to 30.11.18, and a permanent online archive.
Research Contribution: My major contribution concerns the sixth component, Liversidge v Anderson [1942] AC 206, a notorious executive detention case. This component traverses Lord Atkin’s landmark, internationally-acclaimed dissent therein – its context, content and legacy, and its continued adoption in Australian law. I contributed the major research and, with Justice Applegarth and the Supreme Court Library, fashioned the text/visuals. This component is displayed on a Library wall and online; it underlines the vital importance of strictly scrutinising arbitrary detention’s injustice. The Exhibition is innovative as a judicial-academic collaboration that contextualises and updates Lord Atkin’s legacy – it reflects renewed legal history interest, and offers valuable educational perspectives and resources for lawyers, academics, students and the public.
Research Significance: The Exhibition’s excellence lies in its public benefit aims and judicial-academic collaboration, reflecting the judicial call for greater attention to legal history’s lessons. Its opening inaugurated the Atkin Lecture, a public legal lecture delivered by the Honourable Susan Kiefel, Chief Justice, High Court of Australia, on 28.11.17. Justice Applegarth’s accompanying speech recognised my contribution. The Exhibition’s ‘sell-out’ opening, online status, and continued attendance attest to its acclaim.No Full Tex
Influence of ac ageing on space charge dynamics in LDPE
No full textPolymeric materials have been widely used as insulation in power industry due to their excellent electrical properties. However, these properties deteriorate in time irreversibly when the material is subjected to electric stress. Although space charge is believed to play an important role in ac ageing, exact mechanisms are poorly understood due to very limited experimental data. In the present work efforts have been made to investigate the influence of ac ageing on space charge dynamics in low-density polyethylene (LDPE). LDPE films with 200mm were aged at 50 kV/mm at 50 Hz for various times at ambient temperature. Space charge dynamics in the samples prior to and after ageing were monitored using the pulsed electroacoustic (PEA) technique under dc electric stress. The results indicate that there is a significant amount of homocharge accumulation in the unaged sample due to charge injection. These injected charges are the captured by the deep traps originated from the interface between crystalline and amorphous regions in LDPE. Ageing under ac condition does not necessarily lead to an increase in amount of charge in the bulk but leads to an increase in mobility of charge carriers. Chemical analysis by infrared spectroscope (FTIR) reveals there are chemical changes taken place in the bulk of the material after ac ageing. It is believed that the chemical changes introduce shallow traps which promote the movement of charge carriers in the bulk. Consequently, the injected charges spread across the sample
A power sharing series power BJT array with isolated low voltage control for AC power control applications
No full textA technique for a continuously variable AC resistance using a series BJT array is presented. This array provides high power dissipation capability and uniform voltage and power distribution across the individual transistors. The array, controlled using a set of optoisolators to maintain the electrical isolation between the control circuits and the power stage, could be used as the basis to develop several useful techniques including a solid state AC regulator with comparable performance to the commonly used ferro-resonant systems; a linear AC electronic load suitable for testing UPS and other power conditioners; and, in other AC power control applications such as switching capacitors in AC resonant circuits
Ac Response in the Nonequilibrium Anderson Impurity Model
No full textThe ac response of a single Anderson impurity coupled to two reservoirs with different chemical potentials is studied using an equation of motion approach. In the Kondo regime, we show that resonant behavior in the ac response is found in the low-frequency limit and the frequency of the ac field matches the chemical potential differences. The resonant behavior is a direct consequence of the “double” Kondo peak structure in the one-electron spectral function.</p
Anderson Cooper on oil spill transparency
No full textAnderson Cooper comments that the government is blocking cameras and reporters from getting any closer to the boons and oil soaked wildlife under force of law, threats of felony charges, fines. Security forces who are blocking the reporters do not disclosenews-lit-media/news-video-and-storiesx264.mp4The work(s) contained within this record have been analyzed and cataloged by members of the University Libraries' Resource Management Division.Center for News Literacy
Critical behavior of ac conductivity near the Anderson transition
No full textWe investigate the dynamic scaling behavior of ac conductivity σ(ω) in three-dimensional (3D) unitary and symplectic systems in addition to orthogonal one by means of large-scale simulations. It is demonstrated that the ac conductivity near the Anderson transition behave as σ(ω)∝ωδ(δ≃1/3) for all of the above systems. Numerical calculations are performed by an efficient algorithm based on the forced oscillator method (FOM), which enables us to accurately treat large-scale quantum systems with less computational effort. The values of the exponents δ are determined by the finite-time scaling method for the FOM
Critical behavior of ac conductivity near the Anderson transition
No full textWe investigate the dynamic scaling behavior of ac conductivity () in three-dimensional ͑3D͒ unitary and symplectic systems in addition to orthogonal one by means of large-scale simulations. It is demonstrated that the ac conductivity near the Anderson transition behave as ()ϰ ␦ (␦Ӎ1/3) for all of the above systems. Numerical calculations are performed by an efficient algorithm based on the forced oscillator method ͑FOM͒, which enables us to accurately treat large-scale quantum systems with less computational effort. The values of the exponents ␦ are determined by the finite-time scaling method for the FOM. ͓S0163-1829͑99͒11943-X
Dwight D. Eisenhower to Dillon Anderson, April 1, 1953
No full textEisenhower thanks Anderson for being a consultant to the National Security Councilr"
THE WHITE HOUSE
WASH I NGTON
April 1^ 1953
Dear l-Ir. Anderson;
This letter takes iTlth it my warm appre¬ ciation for your contribution to our reconsideration and re-direction of National Security policies.
F
It was a solid help to Imve you and yoLir associates as Consultants to the National Security Council devote so much time in JIarch to. studying the area and limits of our paramount problems and then giving us the benefit of your informed judgment.
Tour support of the new courses of ac was an iiirportant factor in arriving at a common
decision.
At an appropriate later time in the Springy I hope the Consultants will return and see how their decision is being carried out in the budgetary and Congressional processes. Mr. Cutler will be in touch with you and I shall look forward to meeting with you again.
<r
/
Sincerely,
Dillon Ajiderson, Esq..
Baker ^ Botts ^ Andrews Ss Parish
Espersor Building
Houston
Texas
Experimental High-Frequency Parameter Identification of AC Electrical Motors
No full textIn order to predict conducted electromagnetic interference in inverter-motor drive systems, high-frequency (HF) motor models are requested and the involved parameters have to be available. In previous studies, the authors have presented an accurate HF model for induction motors and they have defined the procedures to identify the model parameters. In this paper, these results are extended to several types and sizes of industrial ac motors such as induction, synchronous reluctance (without interior permanent magnets), and brushless motors. The model parameter-identification procedure has been improved, and it is based on a least-squares data fitting applied to the measured magnitude and phase-frequency-response curves of the phase-to-ground and the phase-to-neutral impedances. The aim of this paper is to provide quick indications to select the suitable values of the HF model parameters, with reference to the size and type of the ac motor, to evaluate the HF voltage and current components in inverted-fed ac motor system
Using the AC Drive Motor as a Transducer for Detecting Electrical and Electromechanical Faults
No full textCondition monitoring of AC motors is a subject area that has received extensive research. Whether this monitoring is carried out on a scheduled basis by engineer intervention, or continuously using an on-line unit, the results of this testing enable preventative maintenance work to be a carried out earlier, before any major failure occurs. Monitoring using vibration analysis is the most common and depending on the plant, can be done once or twice a year. This is usually limited to the condition of motor bearings and is not commonly used to detect failures in the motor electromagnetic systems. Monitoring units that use motor current measurements are also available, but these are less widely-used and usually on major plant motors (>250kW for example) that have a large capital outlay to replace.
The industry drivers – as always – are maximum plant and machinery uptime, with the minimal amount of scheduled maintenance. If maintenance is carried out too regularly, costs rise significantly not only due to the maintenance activity itself, but disruption to production schedules. Maintenance schedules that are too infrequent can result in an unacceptable rise in total failures of plant that are unexpected and may cause a significant amount of production disruption and downtime, especially if this occurs during out-of-hours working time. However, industry now faces another big challenge and one that has had a good share of exposure over the last few years. It is of course, the drive to reduce carbon emissions and with it the amount of energy that a plant itself consumes. What has brought this more to the fore recently is the significant rise in energy costs. Whilst product margins have to remain the same, many companies energy costs have seen a two to three-fold increase in energy budgets in the last few years alone. For industry processes that have a significant amount of fan and pump applications, the manufacturers of low-cost AC inverters have saturated the lower-performance market of inverter drives such that any drive can control these type of fan and pump applications, where accurate speed control is not a major driver.
Unfortunately, this can be a step backwards for end-users of plant that use equipment to monitor motor condition via motor current signals. Additionally, vibration analysis that relies upon ‘base-lining’ motor data when the AC motor is running at base speed may not give accurate readings when the motor is under inverter control and running at a different speed.
For manufacturers of AC inverter drives in this low-end market, it can be difficult to sell a product from one manufacturer over another without the unit having a “USP”, or Unique Selling Proposition. Most decisions taken on inverter equipment purchase at this level are usually in favour of the equipment that costs the least to purchase. Credibility of manufacturers based on product history and perceived reliability cuts little ground with an ever cost-conscious industry.
This is where the research into diagnosis of faults on inverter driven motor systems can provide just this USP for manufacturers. If the incorporation of on-line diagnosis for simple inverter applications can be brought to a typical inverter unit at a reasonable cost, the manufacturer who can offer this gains a unique foothold in the marketplace – a drive that can monitor and signal that the motor it is driving is showing signs of early failure.
It will be sensible to limit this research to simple inverter applications as high-end inverter drives that operate equipment such as high-speed printing presses, rotary shears will be more difficult to model and simulate than a fan or pump application.
It is hoped that a typical inverter drive can relay enough detailed information about the load which it is driving to allow this to be used for abnormal motor load conditions as this will provide a platform on which to extend the research beyond this MSc and into the realms of incorporating such technology into a drive manufacturers equipment. If this can be done without major modification to an inverter, then it may be easier to implement in equipment offered by different manufacturers.
It is quite possible that this technology could be licensed under a name that guarantees the performance of the condition monitoring algorithms and reliability from one drive manufacturer to another
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