Cu(Ⅱ), Co(Ⅱ), Ni(Ⅱ)와 Dithiooxamide의 착물형성 Mechanism과 반응 속도에 관한 연구

장진규,이동선 동의공업대학 1999 論文集 Vol.25 No.1

The kinetics of the reaction of Dithiooxamide with Nickel(D), Cobalt(n) and Copper(Ⅱ) to form the mono complexes have been studied at 25℃ and 1.0M ionic strength by conventional and stopped-flow spectrophotometry. The Semi aci form of Dithiooxamide does not react with metal ions, while the aci form reacts by parallel acid-independent and inverse-acid paths. The rate constant for the reaction of HA, the undissociated aci form, with Ni²+, is 4.6, respectively. and the rate constants for the reaction of A?? , the aciate ion, with Ni²+, Co²+ and Cu²+ are 2.7 x 10⁴, ??5.2x10⁴and 5.1 x 106 M??· sec??, respectively. The rate constants, K?? and Ks, for the Semi aci - aci tautomerism of the Dithiooxamide defined by Semi aci ?? aci (K??: forward, KS: revers) are 9.2 x 10??and 2.3 sec??, respectively. The kinetics of the complex formation reactions are discussed in terms of a sterically controlled substitution mechanism and in terms of a mechanism in which proton loss from the ligand is an important rate-determining factor. The values of the equilibrium constants, K₁, for the reaction, Mⁿ+ + HA?? MA(??) + H+ where HA represents the undissociated Dithiooxamide, were found to be 9.6 x 10??, 2.8 x 10??and 0.28 at 25℃ and 1.0M ionic strength for the Nickel(Ⅱ), Cobalt(Ⅱ) and Copper(Ⅱ) system, respectively. (원문을 참조하세요)

MECHANICAL-ACTIVATED PHASE FORMATION OF NiTi IN THE PRESENCE OF NANOPARTICLES

M. FARVIZI,T. EBADZADEH,M. R. Vaezi,A. SIMCHI,김형섭 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.5

Effect of Al2O3 nanoparticles (80 nm) on the grain structure and phase formation in Ni-50Ti system during high-energy mechanical alloying (MA) was studied. While the formation of NiTi B2 phase occurs progressively during MA, it is shown that the hard inclusions cause abrupt phase formation at short milling times, particularly at higher nano-Al2O3 contents. High-resolution transmission electron microscopy showed significant grain refinement in the presence of alumina nanoparticles to sizes less than 10 nm, which precedes the formation of semicrystalline structure and reduces the diffusion length and thus accelerates the phase formation. The composite powder reached steady-state MA condition at shorter milling times with finer grain structure and higher hardness.

단어 형성과 음절수

최형용 국어국문학회 2004 국어국문학 Vol.- No.138

The study of word formation so far has been focused on the internal structure of words. Therefore the number of syllables in the process of word formation has not been recognized as a matter of great interest. But when the number of syllables attain superiority over the structural similarity of words, it can be considered as a stately mechanism of word formation. Namely the number of syllables can't be dealt with as a sort of constraint simply. We can easily observe the aspect of the number of syllables as a mechanism when substitution and clipping are discovered in the process of word formation. Also we are concerned with nonce words to clarify the word formation competence of speakers. But the tendency to maintain the number of syllables fixedly can be applied in actual words. In this paper we largely confirmed it in the process of derivation. But it can be also found in the process of compounding through blending. However we don't extend it to actual words like in derivation. That is not only a weakpoint of this paper but also a further problem awaiting solution to settle the number of syllables as a mechanism resolutely.

거리 도상성의 관점에서 본 한국어 혼성어의 형성과 의미 특성

손뢰 ( Sun Lei ) 중국한국(조선)어교육연구학회 2023 한국(조선)어교육연구 Vol.21 No.0

This paper aims to examine the formation mechanism and semantic characteristics of korean blends in the view of distance iconicity. The principle of proximity is the psychological basis for blends formation. The base words of the blends are highly relevant, so they are co occurrence relation, and the blends are formed for a effective expression and balance. The meaning of typical blends represents integration rather than the simple sum of the meanings of base words. This semantic characteristics is the result of the directness principle. The components of blends are so close that the influence between them becomes stronger. Through the iconicity relationship between form and meaning of blends, we attempt to reaffirm the status of blends formation rule in the korean word formation system.

일본 해안경관 형성과정의 메커니즘 분석

이석환(Lee, Seok-Hwan) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.10

해안경관은 해안선 중심으로 이루어지는 인공적․자연적 요소의 통합된 장이며, 해안의 구성요소인 자연과 인 간 그리고 인공의 총체적 조망이다. 해안경관은 일반적으로 육역과 다른 경관특성을 지니고 있으므로 도시경관과는 다르게 접근해야한다. 따라서 본 연구는 일본을 사례로 해안경관 형성과정에서 나타나는 메커니즘을 인식단계, 형성 단계, 실천에서 조사․분석하였다. 이를 통해 이 연구는 해안공간의 조화라는 관점에서 다양한 기능을 최종적인 형태로 통합하도록 하는 조사체계 구축, 지역의 자연특성과 공간특성을 고려하여 일관성 있는 평가체계 구축, 해안경관형성 의 정책방향이 조화될 수 있도록 하는 협력체계 구축 등을 해안경관형성의 특성으로 도출하였다. 마지막으로 본 연구 는 일본 해안경관형성의 메커니즘에 나타난 가치를 바탕으로, 국내 해안의 잠재된 매력을 발견하여 지역의 가치향상 과 더불어 국내 해안경관형성 수립방안을 모색하기 위한 시사점을 제시하였다. Coastal landscape is a collective setting of artificial or natural elements along the seaside. The approach method for the coastal landscape formation is different from that of urban landscape formation. This study analyzes the mechanism of coastal landscape formation process in Japan in the aspects of recognition phase, formation phase, and practice phase. The characteristics of coastal landscape formation process in Japan are construction of a survey system for integrating diverse landscape elements as a final coastal landscape, construction of a coherent evaluation system responding the local natural and spatial characters, and building a cooperative system responding the police of coastal landscape formation. This study suggest the implications both for the improvement of domestic local values and for the ways of the domestic coastal landscape formation.

Controlled synthesis of colloidal nanocrystals for optoelectronic devices by studying their formation mechanism

양지웅 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1

Controlled synthesis of colloidal nanocrystals is one of the most important prerequisites to fully exploit their unique properties for a wide range of their applications. However, the formation mechanism of colloidal nanocrystals is not well studied, yet. In this presentation, I will present my research on the nanocrystal formation. First, I will talk about the II-VI semiconductor magic-sized nanoclusters, which are known as important prenucleation intermediates for nanocrystal synthesis. Second, I will discuss my research on in-situ liquid-phase transmission electron microscopy for studying colloidal nanocrystal formation process. At the end, I will briefly show the structure engineering of colloidal nanocrystal quantum dots for optoelectronic applications such as solar cells and light-emitting diodes.

PBDEs and their structural analogues in marine environments: Fate and expected formation mechanisms compared with diverse environments

Choo, Gyojin,Kim, Da-Hye,Kim, Un-Jung,Lee, In-Seok,Oh, Jeong-Eun Elsevier 2018 Journal of hazardous materials Vol.343 No.-

<P><B>Abstract</B></P> <P>The concentrations and relative distributions of 27 polybrominated diphenyl ethers (PBDEs) and 17 methoxylated (MeO-) and 8 hydroxylated (OH-) BDEs were determined in marine environments including sediments, bivalves, and seawater along the southern coast of South Korea to understand their fates and possible formation mechanisms. The relative and substituent distributions of the PBDEs and their structural analogues varied according to the characteristics of the media. PBDEs were dominant in marine sediments and seawater, whereas MeO-BDEs made the highest contributions in bivalves. Similar patterns were previously identified in inland environments in Korea, except in river water where OH-BDEs were dominant. The natural formation of structural analogues might be the main mechanism in marine, as <I>ortho</I>-substituted naturally occurring MeO- and OH-BDEs were dominant in all media and seemed to be more produced than in inland environments. In addition, the higher concentrations of meta-substituted MeO-BDEs nearshore than offshore was observed. This is the first study comparing marine (near- and offshore) and inland to understand the differences in their fate and possible formation mechanisms in each environmental conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The distributions of PBDEs and their structural analogues were compared between marine (near- and offshore) and inland. </LI> <LI> PBDEs dominated in abiotic media, whereas MeO-BDEs were dominant in biota. </LI> <LI> Natural formation might be the main mechanism for PBDE structural analogues in marine and was highly occurred than in inland. </LI> <LI> The higher contributions of meta-MeO-BDEs were observed in inland and nearshore than offshore. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

자전연소합성 반응중 속빈 TiC 섬유의 형성 기구

윤존도,방환철 한국세라믹학회 2000 한국세라믹학회지 Vol.37 No.4

Forming mechanism of fibrous TiC during self-propagating high temperature synthetic reaction was analyzed and suggested. It was revealed that critical temperature for the stable fiber formation was not the melting point of TiC, but the eutectic reaction temperature of TiC and C. Minimum amount of TiC diluent addition required to form fibers was calculated to be 25.6%, which was consistent with the experimental result. Synthesized fibers were found hollow tube-like. The morphology was explained by the diffusion rates of C and Ti in TiC, and by the molar volume chnage of C during the reaction. Expanding shell model was suggested for the hollow fiber formation mechanism.

부상 예혼합화염이 있는 확산화염의 매연 생성 및 산화 메커니즘

문두성(Dusung Moon),남연우(Younwoo Nam),이원남(Wonnam Lee) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40

The soot formation and oxidation mechanisms of laminar ethylene diffusion flames have been experimentally studied at the presence of inner flames. The inner flame was either an inverse diffusion flame (IAF) that is attached at the center nozzle or a lifted premixed flame (ILF). The soot volume fraction profiles were obtained by a laser light extinction technique with an Abel inversion. The soot particle temperature profiles were measured by a modulated LII technique. The flame/soot particle temperatures were increased due to the presence of inner flames for both IAF and ILF cases. However, soot volume fraction at the center region was increased at the presence of an IAF while they were decreased with an ILF. The additional soot particles and PAH's that are supplied due to the nature of an inverse diffusion flame of IAF and the increased temperature for the soot formation region could be main reasons for the increase soot volume fraction. The additional soot oxidation region due to the nature of a premixed flame of ILF at the center region and the increased temperature at the soot oxidation region could be responsible for the decreased soot volume fraction.

지식재산 보호 체제 형성에 대한 내생적 균형

이유환,김상기 한국무역연구원 2022 무역연구 Vol.18 No.3

Purpose This study studies the conditions for the endogenous intellectual property protection(IPP). Design/Methodology/Approach Based on the research and development (R&D) spillover model by d’Aspremont and Jacquemin (1988), the analytical framework of this study is set up. Findings For a given low IPP cost and large R&D spillover to make IPP highly efficient, instead of choosing “no use of the mechanism”, the firms optimally choose “use the mechanism”. In this situation, the profits is worse off, which is a clear case of prisoner’s dilemma. In contrast, for a given high IPP cost that makes IPP inefficient, each firm has an incentive to choose the strategy of “no use of the mechanism”. Research Implications Our finding does not support the public-generating a large volume of domestic IPP. In some countries, the government-supported policies to drive firms to create greater intellectual property rights have been widely established. If the polices reduce IPP costs, the distortion in producer surplus will be larger.