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Oliver Muñiz-Serrato,Juan Serrato Rodríguez 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.4
The low temperature sol-gel approach is used in which the titanium butoxide (IV) precursor is hydrolyzed in the presence ofacetic and nitric acids to form a bidentate acetate complex (1538, 1429 cm−1 IR doublet). It is known that the role of the aceticacid as a chemical modifier controls the condensation and oligomerization reactions, but other effect of the complex acetateligand comprises the preferential crystallization of the titania into the anatase phase. In addition, it is found here, that thepresence of such a ligand at acidic pH values considerably impacts the nanostructure i.e. the formation of smooth hydrophobicanatase films containing fine non-aggregated nano-crystallites with auto-assembled micro pores. The resulting anatase-acetatenano-crystalline material is used to form thin films by the flow coating process. 4.2 nm size crystalline anatase and fullydispersed nanoparticles form a pattern of ultra-small crystallites as shown by TEM that are presumably responsible for theremarkable smooth and macro porous thin films with applications in photo-catalysis.
An empirical study on the X-ray attenuation capability of n-WO3/n-Bi2O3/PVA with added starch
Oliver Namuwonge,Ramli Ramzun Maizan,Noor Azman Nurul Zahirah 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.9
Matrix composites of n-WO3/n-Bi2O3/PVA with different loadings of n-WO3/n-Bi2O3 mixtures (0e15 wt%) and starch (0 and 3 wt%) were fabricated by using melt-mixing method. The X-ray attenuation capability were evaluated based on mass attenuation coefficient (m/r) using a general diagnostic X-ray machine at 40e100 kVp. The effect of starch addition on the dispersion of the fillers in the PVA matrix were observed by using FESEM through morphological analysis. The fabricated samples have shrunken and caused their thickness to be decreased (0.35 mme0.55 mm) after the drying process even though fixed thickness (2.0 mm) was set initially. The density and HVL values of the samples with 3 wt% starch was seen lower than samples without starch (0 wt%), however the former have provided improvement in filler dispersion and better X-ray attenuation capability compared to the latter. As conclusion, the matrix composite of n-WO3/n-Bi2O3/PVA with 15 wt% of n-Bi2O3, 8 wt% of n-WO3 and 3 wt% starch can be selected as the best promising candidate for X-ray shielding materials
Neutralizing Bacterial Spores Using Halogenated Energetic Reactions
Oliver Mulamba,Emily M. Hunt,Michelle L. Pantoya 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.5
The fight against biological warfare has prompted investigation of the chemistry and exothermic energy from energetic material reactions as a means for the neutralization of bacterial spores. The interaction between energetic reactions containing biocides and spore forming bacteria is not well understood. The goal of this work is to fundamentally examine the mechanisms of neutralization for Bacillus thuringiensis utilizing a halogenated energetic material reaction. Spore neutralization is attributed to a thermal effect from the reaction heat and the associated chemical influence of the halogen gas (i.e., produced from combustion). Results show heat transfer in the spore enhances the effectiveness of the halogen gas in the neutralization process and that elevated temperatures increase spore permeability, facilitating gas penetration and accelerating spore neutralization. Based on experimental results, a mathematical model was developed to predict spore behavior during reaction exposure over varying time scales. In the millisecond range, the model showed that the coupled thermal-biocidal gas mechanism will require elevated temperatures of 360oC to produce 80% neutralization in tens of milliseconds while thermal conditions alone would require nearly 1,000oC for the same neutralization. These results provide molecular-level insights into the components underpinning biological processes leading to spore neutralization.
두 개의 중첩 레이저 빔을 사용하여 구리 헤어핀의 레이저 용접에서 스패터와 기공의 감소
Oliver Bocksrockera,Nicolai Spekera,Matthias Beraneka,Tim Hessea 한국레이저가공학회 2020 Laser Solutions Vol.23 No.12
헤어핀 기술은 e-Mobility 자동차 부문의 파워 트레인 효율성을 높이기 위한 e-Drive 제조에 새로운 수준의 자유를 제공한다. 구리 헤어핀의 레이저 용접에 대한 실험적 조사를 통해 소위 “2in1-fiber”를 이용한 중첩된 레이저 빔(BrightLine Weld)의 특정 빔 프로파일이 키홀을 안정화시켜 결과적으로 스패터와 기공을 감소시킨다는 것을 알아냈다. 스패터 정량화를 위해 프로세스의 고속 동영상이 사용되었다. 용접 중 기공 생성은 온라인 xRay-imaging을 통해 조사되었다. 관찰에 따르면, 중첩된 레이저빔이 사용될 경우 키홀의 크기가 넓어지는 것으로 나타났다. 그 결과, 키홀의 형태가 시간이 경과함에 따라 안정화되었다. 또한 키홀 형태 덕분에 증발된 물질의 증기를 수월하게 제거할 수 있다. 후자는 키홀이 부푸는 것을 억제하며 따라서 헤어핀 용접 프로세스 중에 스패터와 기공이 형성되는 것을 0에 가깝게 줄일 수 있다.
From Tombstones to Corpora: TSML for Research on Language, Culture, Identity and Gender Differences
( Oliver Streiter ),( Leonhard Voltmer ),( Yoann Goudin ) 한국언어정보학회 2007 학술대회 논문집 Vol.2007 No.-
Tombstone inscriptions represent a linguistic genre which yields insights in culture and language. Creating corpora from tombstones is thus a complementary approach for the study of languages and cultures. For the annotation of tombstone corpora, we propose TSML, the Tombstone-Markup-Language, developed during the massive annotation of Taiwanese tombstones and a number of tombstones from China, Indonesia and Europe. We discuss our conceptual framework in the annotation of tombstones and derive successively and present preliminary research data to show how the usefulness of the annotations. Finally, we will encourage researchers to participate in the specification of TSML to obtain soon an annotation language for annotations across cultures and languages.
Oliver Lassch,양지청 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.2
International Development (ID) actors are the International development organizations defined above by their common goal, the pursuit of the Millennium Development Goal (MDG). Corporate Social Responsibility (CSR) actors on the other hand are businesses with their most common needs survival, profitability, and economic benefit. We introduce the concept of CSR in construction management and development process. ID organizations targets are mainly socio-environmental, while businesses mostly act in their financial self-interest. There is a mutual interest by ID advocates and businesses in their involvement for the achievement of Millennium Development (MDGs) as an act of CSR. Improving the welfare level and increasing minimum standard of living condition are the main issues. This is the most basic clue to be derived from this paper. Building up on this we pioneered the idea of an active involvement of traditional ID actors in winning businesses with their extensive capabilities and resources for the achievement of the MDGs. This can only work, if their potential economic benefit from such an involvement can be made graspable. As tools for this task, we introduced 2 straight forward instruments for visualizing the economic value creation process while building up on Porter's and Kramer's ideas.