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Nano-structural effects on Hematite (α-Fe2O3) nanoparticle radiofrequency heating
Powell Camilah D.,Lounsbury Amanda W.,Fishman Zachary S.,Coonrod Christian L.,Gallagher Miranda J.,Villagran Dino,Zimmerman Julie B.,Pfefferle Lisa D.,Wong Michael S. 나노기술연구협의회 2021 Nano Convergence Vol.8 No.8
Nano-sized hematite (α-Fe 2 O 3 ) is not well suited for magnetic heating via an alternating magnetic field (AMF) because it is not superparamagnetic—at its best, it is weakly ferromagnetic. However, manipulating the magnetic properties of nano-sized hematite (i.e., magnetic saturation (Ms), magnetic remanence (Mr), and coercivity (Hc)) can make them useful for nanomedicine (i.e., magnetic hyperthermia) and nanoelectronics (i.e., data storage). Herein we study the effects of size, shape, and crystallinity on hematite nanoparticles to experimentally determine the most crucial variable leading to enhancing the radio frequency (RF) heating properties. We present the synthesis, characterization, and magnetic behavior to determine the structure–property relationship between hematite nano-magnetism and RF heating. Increasing particle shape anisotropy had the largest effect on the specific adsorption rate (SAR) producing SAR values more than 6 × greater than the nanospheres (i.e., 45.6 ± 3 W/g of α-Fe 2 O 3 nanorods vs. 6.89 W/g of α-Fe 2 O 3 nanospheres), indicating α-Fe 2 O 3 nanorods can be useful for magnetic hyperthermia.
Prospects for Improved Marine Pollution Control
Powell, R. The Korean Society of Marine Environment and safet 1996 해양환경안전학회지 Vol.2 No.1
When considering marine pollution control procedures there are three general areas which demand close attention. These are: $\bullet$ oily bilge water $\bullet$ refuse $\bullet$ sewage All of these applications can be handled constantly changing to address the complexity of the waste management issues. The basic marine pollution regulations are covered by the International Maritime Organizations MARPOL 73/78 convention, with the various annexes and revisions. Of particular importance for equipment to deal with oily-water, sewage and plastic wastes.
Detecting buried human remains using near-surface geophysical instruments
Powell Kathryn Korean Society of Earth and Exploration Geophysici 2004 지구물리와 물리탐사 Vol.7 No.1
To improve the recovery rate of unlocated buried human remains in forensic investigations, there is scope to evaluate and develop techniques that are applicable to the Australian environment. I established controlled gravesites (comprising shallow buried kangaroos, pigs, and human cadavers) in South Australia, to allow the methodical testing of remote sensing equipment for the purpose of grave detection in forensic investigations. Eight-month-old pig graves are shown to provide more distinct identifying results using ground-penetrating radar when compared to four-year-old kangaroo graves. Two further aspects of this research are presented: information (obtained from a survey) relating to the police use of geophysical instruments for locating buried human remains, and the use of electrical resistivity for locating human remains buried in a coffin. The survey of Australian police jurisdictions, covering the period 1995-2000, showed that police searches for unlocated bodies have not successfully located human remains using any geophysical instruments (such as ground-penetrating radar, magnetometers, or electrical resistivity). Lower resistivity readings were found coincident with the 150-year-old single historical burial in a heavily excavated field, in a situation where its exact location was previously unknown.
A different interpretation from outside the network
Martin Powell 서울대학교행정대학원 2016 Asian Journal of Political Science Vol.24 No.3
This review provides a critique of ‘Democratic Governance’ by one of the leading commentators on governance, Mark Bevir, focusing on the UK New Labour government and public services. It examines three main issues. First, an ‘internal’ critique exploring what this text adds to Bevir’s earlier contributions on governance finds that it focuses on ‘early’ New Labour. Second, the ‘story’ presented here is rather different to Bevir’s, focusing on markets and hierarchies rather than networks. Third, the review argues that some of the data and methods used by Bevir in his interpretative, decentred approach may not give as ‘thick’ a description as he claims.