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Enhanced Properties of Extra-fine Nickel Steels for PM Gears
Stephenson Thomas F.,Korotkin Maria,Metcalfe Shawn 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Highly compressible Ni-Mo steels are attractive materials for PM due to high sinter density and ease of processing. Extra-fine Ni admixed PM steels have demonstrated improved mechanical properties and rolling contact fatigue resistance due to a more uniform microstructure and increased Ni diffusion during sintering. Sinter densities of single press single sinter XF Ni-Mo steels can approach at moderate compaction pressures. Leaner alloys based on extra-fine Ni powder are possible depending on the performance requirements of the PM steel part. Extra-fine Ni steels are particularly attractive for the growing market of high performance PM gears and sprockets.
Extra-fine Ni Powder for Diamond Tool Binder Applications
Stephenson Thomas F.,Korotkin Maria,Metcalfe Shawn 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
A new extra-fine grade Ni powder (XF Ni) has demonstrated increased sintering activity in Co-Fe-Ni binders for diamond tool applications. XF Ni has the advantage of significantly lower cost than XF Co. Up to 30% of XF Co was substituted with XF Ni while maintaining comparable apparent hardness and transverse rupture strength to pure Co binders. Ni substantially increased the diffusion of Fe. Diamond tool producers can take advantage of the improved sintering properties of XF Ni powder to substantially lower material costs.
Krista Stephenson,Kyle Kalkwarf,Emmanouil Giorgakis 한국간담췌외과학회 2021 Annals of hepato-biliary-pancreatic surgery Vol.25 No.1
Hepatic artery pseudoaneurysm (HAP) is a rare, highly morbid and frequently fatal complication of liver transplantation. Most are a mycotic mediated weakness of the arterial wall, with associated bacterial or fungal infection of ascitic fluid. As it is usually asymptomatic prior to rupture, the majority present in acute hemorrhagic shock and dire extremis. Resuscitative endovascular balloon occlusion (REBOA) was initially developed for the management of noncompressible hemorrhagic shock in trauma; however, remains underutilized and understudied in the non-trauma setting. We present the case of a mycotic hepatic artery pseudoaneurysm rupture due to Streptococcus constellatus and Klebsiella pneumonia post directed donor orthoptic liver transplant, in which REBOA was employed in the setting of impending exsanguinations as a bridge to definitive surgical intervention. Although this patient passed away of multiorgan system failure prior to re-transplant, this case demonstrates the importance of a heightened suspicion of this devastating complication, especially in the setting of bilioenteric reconstruction and perihepatic fluid collection, as well as the benefit of utilizing resuscitative techniques such as REBOA prior to definitive surgical or endovascular therapy to mitigate the high morbidity and mortality of this condition.
Pam Millward,Maxine S. Stephenson,Nane Rio,Helen Anderson 서울대학교 교육연구소 2011 Asia Pacific Education Review Vol.12 No.2
This paper describes a research project, "Voices from Manukau", that investigated the impact of a joint initiative by a university and an institute of technology in New Zealand. The purpose of the initiative was to increase the participation of students traditionally under represented at tertiary-level study, particularly MAori (indigenous people) and individuals from Pacific Island nations. Many of the participants were adults who had not experienced high levels of success during their compulsory period of education and they lived in low socio-economic areas. We found that participation of under-represented groups increased. The "Manukau" students were as successful as other undergraduate students studying at the university. Of particular interest was the high level of success of MAori and Pacific Island students.
Paik, Jong-Min,Stephenson, Dale,Spear, Terry,Seymour, Marie,Hong, Dae-Yong 한국산업위생학회 2003 한국산업보건학회지 Vol.13 No.2
에어로졸의 흡입은 작업환경으로 인한 높은 사망률의 여러 가지 요인 중 대표적인 것의 하나이다. 에어로졸이 호흡기내에 침착하여 건강상의 문제점을 일으키는 경우 지금까지 전통적으로 사용되어 오던 방법은 소위 총 에어로졸 측정법 이었다. 미국에서 1970년대부너 이 총 에어로졸을 측정하기 위하여 주로 사용한 것은 37mm 여과지가 장착된 포집기였다. 그러나 이에 대한 비판, 즉 호흡성 에어로졸을 적절히 측정하지 못하고 있다는 비판이 일어나 소위 호흡성 에어로졸을 측정할 수 있는 장치중 하나가 TSI RespiconR이다. 본 연구는 전통적인 37mm 여과지가 장착된 포집기와 TSI RespiconR를 동시에 사용하여 선박의 녹 제거 작업 시 발생하는 에어로졸 량을 각각 측정하여 그 차이를 검토하였다. 호흡위치에서 15분간 측정을 통해 29건을 비교한 결과 15건에서 종래의 37mm 여과지가 장착된 포집기의 값이 TSI RespiconR의 값보다 높게 나타났다. 그러나 origin regression model, Wilcoxon Signed Rank Test 등을 통한 통계적 분석에서는 유의한 차이를 발견할 수 없었고 따라서 호흡성 에어로졸의 측정에 있어서 종래의 37mm 여과지가 장착된 포집기 사용일 불가하다는 최근의 경향은 재고되어야 하겠다.