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Photopolymerization of conductive polymeric metal nanoparticles
Cai, Xichen,Anyaogu, Kelechi C.,Neckers, Douglas C. Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.11
5-Mercapto-2,2'-bithiophene functionalized metal nanoparticles BTSMs [M: copper (Cu), silver (Ag), and gold (Au)] of different diameters (2-8 nm) were synthesized. Conductive polymeric metal nanoparticles were formed from BTSM by UV irradiation. The photopolymerization mechanism was investigated using transient absorption measurements. Intramolecular electron transfer from the ligand to the metal nano-core was confirmed. Nanoparticle size, as well as plasmon electronic interactions, are important factors. The smaller the nanoparticle and the stronger the electronic interactions, the faster the electron transfer is. The three-dimensional structure of the polymerized BTSM was identified using transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The conductivity of polymerized BTSM measured in poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT/PSS) film is higher than that of the nonpolymerized BTSM.
Photochemical synthesis of 2,3,9,10-tetrabromopentacene: its unusual photodimerization
Zhao, Yuewei,Cai, Xichen,Danilov, Eugene,Li, Guifeng,Neckers, Douglas C. Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.1
The photogeneration of 2,3,9,10-tetrabromopentacene from its precursor dione by photodecarbonylation was investigated. An unusual photodimer, 3,3',9,9',10,10'-hexabromo-2,2'-bipentacene, is produced.
ErbB2 kinase domain is required for ErbB2 association with β-catenin
하남출,슈완핑,넥컬즈렌,정연진,Ha, Nam-Chul,Xu, Wanping,Neckers, Len,Jung, Yun-Jin Korean Society of Life Science 2007 생명과학회지 Vol.17 No.3
To investigate the region of ErbB2 for the $ErbB2-{\beta}-catenin$ interaction, a proteasome $resistant-{\beta}-catenin$ and various ErbB2 constructs were transfected in COS7 cells. ErbB2 proteins were immunoprecipitated, and coimmunoprecipitated ${\beta}-catenin$ was examined by Western blotting. ${\beta}-catenin$ coimmunoprecipitated with full length ErbB2. Of the truncated ErbB2 proteins DT (1-1123), DHC (1-1031) and DK (1-750), the ErbB2 constructs containing the kinase domain, DT and DHC, precipitated together with ${\beta}-catenin$ but DK containing no kinase domain did not. To further test the requirement of the kinase domain for ${\beta}-catenin-ErbB2$ interaction, the presence of ${\beta}-catenin$ in the immunocomplex was examined following transfection with an ErbB2 mutant (${\triangle}750-971$) whose kinase domain is internally deleted and subsequent immunoprecipitation of the ErbB2 mutant. ${\beta}-catenin$ was not detected in the immunocomplex. These results suggest that the ErbB2 kinase domain comprises a potential site for ${\beta}-catenin$ binding to the receptor tyrosine kinase. ${\beta}-catenin$과 결합하는 ErbB2의 부위를 조사하기 위하여 proteasome에 의하여 분해되지 않는 ${\beta}-catenin$과 다양한 ErbB2 construct를 COS7 세포에 transfection한 후 ErbB2 단백질을 그것의 항체로 가라앉혔다. 이 때 공침한 ${\beta}-catenin$을 Western blot으로 분석하였다. C 말단에서부터 잘려진 ErbB2 단백질 중에 kinase 영역을 가지고 있는 것들만 ${\beta}-catenin$과 공침하였다. kinase 영역의 필요성을 확인하기 위하여 kinase 영역이 내부에서 제거된 ErbB2 construct를 ${\beta}-catenin$과 transfection 한 후 동일한 실험을 실시하였다. 이 실험에서 ${\beta}-catenin$는 kinase 영역이 내부적으로 제거된 ErbB2 단백질과 공침하지 않았다. 이 결과는 ${\beta}-catenin$과 결합하는 ErbB2의 위치는 kinase 영역내에 있음을 제시한다.
Incipient Cavitation in a Bulb Turbine: Model Test and CFD Calculation
Necker, Jorg,Aschenbrenner, Thomas Korean Society for Fluid machinery 2011 International journal of fluid machinery and syste Vol.4 No.1
For a certain operating point of a horizontal shaft bulb turbine (i.e. volume flow, net head, blade angle, guide vane angle) the efficiency for different pressure levels (i.e. different Thoma-coefficient ${\sigma}$) is calculated using a commercial Computational Fluid Dynamics (CFD-)-code including two-phase flow and a cavitation model. The results are compared with experimental results achieved at a closed loop test rig for model turbines. The comparison of the experimentally and numerically obtained efficiency and the visual impression of the cavitation show a good agreement. Especially the drop in efficiency is calculated with satisfying accuracy. This drop in efficiency in combination with the visual impression is of high practical importance since it contributes to determine the admissible cavitation in a bulb-turbine. It is seen that the incipient cavitation in Kaplan type turbines has no major importance in determing this admissible amount of cavitation.
Ab initioprediction of the mechanical properties of alloys: The case of Ni/Mn-doped ferromagnetic Fe
Wang, Guisheng,Schö,necker, Stephan,Hertzman, Staffan,Hu, Qing-Miao,Johansson, Bö,rje,Kwon, Se Kyun,Vitos, Levente American Physical Society 2015 Physical review. B, Condensed matter and materials Vol.91 No.22
Can Practical Reason be Artificial?
( Dieter Schönecker ) 중앙대학교 인문콘텐츠연구소 2018 인공지능인문학연구 Vol.2 No.-
Can practical reason be artificial? The answer, from a Kantian point of view, is clearly negative: Practical reason cannot be artificial. After a preliminary remark on the possibility of Kantian moral machines (1.1) and some basics on the concept of practical reason (1.2) and Kant’s intuitionism (1.3), I will argue that in a Kantian model of moral obligation, the typical (human) moral subject has moral feelings and must have them in order to cognize the validity of the moral law as a categorical imperative (1.3). Using the knowledge argument against physicalism and functionalism, I shall argue that computers have no feelings and, a fortiori, no moral feelings; therefore, computers are no moral subjects (1.4). This conclusion is based on a Kantian I feel rather than I think (1.5). I will then tackle two problems with this argument (2). I will conclude with an analogy (3): Just as planets do not fly, computers do not feel.