Publications by authors named "Philip Michael"

It has been noted that olfactory and gustatory disturbances may precede or accompany the typical features of COVID-19, such as fever and cough. Hence, a high index of suspicion is required when patients report sudden loss of smell or taste, in order to facilitate timely diagnosis and isolation. The aim of this study was to assess the frequency of olfactory and gustatory disturbances in COVID-19 positive patients from a cohort representative of Melbourne, Australia.

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We present experimental and numerical studies on a method to mitigate screening current-induced field (SCF) for NI REBCO coil. The SCF is the major field error to incorporate a REBCO insert for a high field LTS/HTS magnet. The field-shaking technique is going to be used to mitigate the SCF of 800-MHz REBCO insert magnet (H800) for MIT 1.

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The MIT 1.3-GHz LTS/HTS NMR magnet is currently under development. The unique features of this magnet include a 3-nested formation for an 800-MHz REBCO insert (H800) and the no-insulation (NI) winding technique for H800 coils.

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We present assembly and test results of a 3-nested-coil 800-MHz (18.8 T) REBCO insert (H800) for the MIT 1.3 GHz LTS/HTS NMR magnet currently under completion.

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Article Synopsis
  • The MIT 800-MHz REBCO insert magnet (H800), designed to achieve 18.7 T and enhance a larger magnet for a proton resonance frequency of 1.3 GHz, unexpectedly quenched during operation in March 2018, leading to more extensive damage than initially assessed.
  • A new design, H800N, is being developed to address flaws identified in the H800 by focusing on improved stability against quenching and minimizing damage during unforeseen events.
  • Key enhancements for H800N include a single solenoid structure with better coil design, improved thermal stability, and reduced current margins for effective quench protection.
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In this paper we present design, construction, and preliminary results of a proof-of-concept prototype of high-temperature superconductor (HTS) shim coils operated at 77 K and energized, for the first time among all shim coils, by a flux pump, here called digital flux injector (DFI). Although the prototype shims were wound with 2-mm wide REBCO tape, and DFI with Bi2223 and REBCO tapes, the HTS Z1 and Z2 shims to be installed in the MIT 1.3-GHz LTS/HTS NMR magnet (1.

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We present design and test results for a thermally-activated persistent-current switch (PCS) applied to a double pancake (DP) coil (151 mm ID, 172 mm OD), wound, using the no-insulation (NI) technique, from a 120-m long, 76-μm thick, 6-mm wide REBCO tape. For the experiments reported in this paper, the NI DP assembly was immersed in a volume of solid nitrogen (SN2), cooled to a base temperature of 10 K by conduction to a two-stage cryocooler, and energized at up to 630 A. The DP assembly operated in quasi-persistent mode, with the conductor tails soldered together to form a close-out joint with resistance below 6 nΩ.

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In this paper, we present experimental results, of a small-model study, from which we plan to develop and apply a full-scale field-shaking system to reduce the screening current-induced field (SCF) in the 800-MHz HTS Insert (H800) of the MIT 1.3-GHz LTS/HTS NMR magnet (1.3G) currently under construction-the H800 is composed of 3 nested coils, each a stack of no-insulation (NI) REBCO double-pancakes.

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We present construction and test results of Coils 2 and 3 of a 3-coil 800-MHz REBCO insert (H800) for the MIT 1.3 GHz LTS/HTS NMR magnet currently under construction. Each of three H800 coils (Coils 1-3) is a stack of no-insulation REBCO double pancakes (DPs).

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In this paper we present two design options for a tabletop liquid-helium-free, persistent-mode 1.5-T/90-mm MgB "finger" MRI magnet for osteoporosis screening. Both designs, one with and the other without an iron yoke, satisfy the following criteria: 1) 1.

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This paper focuses on the construction and test results of Coil 2 that is part of a trio of nested coils composing the REBCO 800 MHz insert. Upon its completion, the REBCO 800 MHz insert will be placed in the bore of a 500 MHz low temperature superconducting (LTS) NMR magnet (L500) to form the MIT 1.3 GHz high-resolution NMR magnet.

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A 1.3-GHz/54-mm LTS/HTS NMR magnet, assembled with a 3-coil (Coils 1-3) 800-MHz HTS insert in a 500-MHz LTS NMR magnet, is under construction. The innermost HTS insert Coil 1 has a stack of 26 no-insulation (NI) double pancake (DP) coils wound of 6-mm wide and 75-m thick REBCO tapes.

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In this paper, we report preliminary results of our on-going effort to develop a superconducting persistent-current switch (PCS) for REBCO pancake coils that will be operated in liquid helium. In the first part of this paper, we briefly describe experimental results of our PCS operated in the temperature range 77-57 K, i.e.

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Midline neck lumps are commonly recognized in clinical practice. Nonetheless, we present an unusual case of a 24-year-old Bangladeshi man who has a slowly growing midline neck lump. The characteristic lump did not move on swallowing and was more pronounced on coughing suggesting an external laryngocoele as a main differential.

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We present design and test results of a superconducting persistent current switch (PCS) for pancake coils of rare-earth-barium-copper-oxide, REBCO, high-temperature superconductor (HTS). Here, a REBCO double-pancake (DP) coil, 152-mm ID, 168-mm OD, 12-mm high, was wound with a no-insulation technique. We converted a ∼10-cm long section in the outermost layer of each pancake to a PCS.

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Objective: To investigate whether drivers of convertible cars are exposed to excessive noise levels.

Study Design: Prospective.

Setting: Data were collected along a main United Kingdom highway.

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Conclusion: In this comparative series, hearing results were superior with titanium compared with autograft ossiculoplasty in the absence of a stapes superstructure. However, in the presence of a stapes superstructure, titanium ossiculoplasties gave superior results to autografts only when comparing an air-bone gap of < 10 dB.

Objective: To compare the hearing outcomes of autograft versus titanium ossiculoplasty at 1 year.

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Objective: The objective of this study is to assess the efficacy of ossiculoplasty procedures in the paediatric population when the Kurz titanium ossicular prosthesis is used.

Patients And Methods: Data was collected prospectively upon 14 ossiculoplasty cases using Kurz titanium prostheses. Audiological parameters using four frequency average (FFA(0.

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Studies were performed to assess the operational feasibility of Trichogramma exiguum Pinto & Platner (Hymenoptera: Trichogrammatidae) augmentation for suppression of the Nantucket pine tip moth, Rhyacionia frustrana (Comstock) (Lepidoptera: Tortricidae), in commercial loblolly pine, Pinus taeda L., plantations. Single inundative releases containing two cohorts of encapsulated T.

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Objectives: This study aims to assess whether operative findings of chorda tympani nerve (CTN) trauma correlate with postoperative symptoms.

Study Design And Setting: A prospective study was conducted over 2 years on 140 middle ear operations analyzing taste disturbances. The operations were subdivided into myringoplasty/tympanoplasty (56 cases), mastoidectomy (64 cases), and tympanotomy (20 cases).

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Background: Chronic obstructive pulmonary disease (COPD) is characterized by inflammation of the lung in association with airflow obstruction. There is increasing evidence of upper airway involvement in COPD and we have reported that this nasal inflammation is proportional to that in the lung. Given recognized relationships between lower airway inflammation and spirometric indices such as the Forced Expiratory Volume in one second (FEV(1)), we hypothesized that there may be a relationship between nasal obstruction and FEV(1) in COPD.

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A study was performed to evaluate the potential of the egg parasitoid Trichogramma exiguum Pinto and Platner (Hymenoptera: Trichogrammatidae), the newly registered insect growth regulator (IGR) tebufenozide (Confirm), and a modified spray technique (top whorl only pesticide application) for suppression of Nantucket pine tip moth, Rhyacionia frustrana (Comstock) (Lepidoptera: Tortricidae), damage in Virginia pine, Pinus virginiana Mill., Christmas trees. Augmentative releases of T.

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