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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.
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.
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.
The Creation of the Korean Welfare State
Martin Powell(마틴 파월),Ki tae Kim(김기태) 동국대학교 사회과학연구원 2020 사회과학연구 Vol.27 No.3
한 국가는 언제, 어떻게, 왜 복지국가로 도약하는가. 이 질문에 대한 명확한 대답을 우리는 아직 가지지 못하고 있는 듯 하다. 이 글은 한국 복지국가의 형성 및 성격에 대한 몇가지 미결의 문제에 접근하고자 한다. 이를 위해 과거 연구들을 분석했다. 한국 복지 국가의 형성 및 성격에 주목한 과거 19개 영문 논문을 분석해본 결과, 16개 연구에서는 한국을 일정한 형태의 복지국가라고 규정했다. 그러나, 대부분의 연구에서 분석의 기초 작업으로서의 복지국가의 명쾌한 개념 정의를 제시하지는 않았다. 이전 연구를 분석하는 동안 우리는 한국 복지국가를 설명하기 위한 다양한 형용사들을 접했다. 이를테면, “공허한”, “작은”, “잔여적”, “보편적”, “전형적”, “근대적” 등이었다. 대부분의 연구들은 한국의 복지국가가 1990년대, 특히 1997년말 금융위기 이후에 성립됐다는 의견을 제시했다. 이 글은 과거 연구들이 분석을 위해 접근한 방식에 주목했다. 한국 복지국가의 기원의 시점을 포착하는 과정에서, 개념 정의로 시작해서 조작화 과정을 거친 뒤 결론에 이르기 위해 근거들을 적용하는 전통적인 연역적 접근을 취한 연구는 희소했다. 또, 다수의 연구들이 분석의 과정에서 ‘서구의 시각’을 일부 차용한 것으로 보였다. 결론적으로, 아직 한국 복지국가의 정의와 측정, 설명에 있어서 많은 불분명함이 남아 있음을 확인할 수 있었다. 특히, 한국 복지국가의 분석할 때, 서구적인 잣대를 쓰는 문제에 대해서는 논의의 여지를 남긴다. We still appear to lack clear answers to seemingly basic questions such as ‘when, how and why does a state become a welfare State’. This article reviews previous literature to address a number of unresolved issues on the creation and characteristics of Korean welfare state. We found that 16 of our 19 articles regard Korea as some sort of ‘welfare state’. However, very few articles present a clear definition of the welfare state, and even fewer presented clear operationalized measures. We found a large variety of adjectives such as “hollow”, “small”, “residual”, “universal”, “prototypical” and “modern” were used to describe the Korean welfare state. The majority of our studies concluded that Korea became a welfare state in the 1990s, especially after the Asian Financial Crisis in 1997. Few took the classic deductive route of specifying definitions, operationalizing criteria, and applying evidence in order to arrive at a creation date of the Korean welfare state. We discovered that analytical remain significant uncertainties about the definition, measurement and explanation of the Korean welfare state, particularly whether western yardsticks are appropriate.
The Cartographic Evolution of the Sino-Mongolian Border at Zamyn Üüd/Erlian
Susan Powell 고려대학교 민족문화연구원 2016 Cross-Currents Vol.- No.21
The shifting relationship between China and Mongolia throughout the twentieth century was played out both on the ground and in maps of their shared border—in the frontier. This cartographic photo essay focuses on one small but distinctive area of the border, where the Trans-Mongolian Railway both perforates the boundary and links the two nations. The twin cities of Zamyn Üüd and Erlian now sit on this crossing, but what was there before, how did this region evolve, and what do cartographic representations of the space tell us? In this essay I address these questions using maps drawn primarily from the library of the University of California, Berkeley.