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COMPARISON BETWEEN Mg II<i>k</i>AND Ca II H IMAGES RECORDED BY SUNRISE/SuFI
Danilovic, S.,Hirzberger, J.,Riethmü,ller, T. L.,Solanki, S. K.,Barthol, P.,Berkefeld, T.,Gandorfer, A.,Gizon, L.,Knö,lker, M.,Schmidt, W.,Rodrí,guez, J. Blanco,Iniesta, J. C. Del Toro IOP Publishing 2014 The Astrophysical journal Vol.784 No.1
<P>We present a comparison of high-resolution images of the solar surface taken in the MgII k and Ca II H channels of the Filter Imager on the balloon-borne solar observatory SUNRISE. The Mg and Ca lines are sampled with 0.48 nm and 0.11 nm wide filters, respectively. The two channels show remarkable qualitative and quantitative similarities in the quiet Sun, in an active region plage and during a small flare. However, the Mg filtergrams display 1.4-1.7 times higher intensity contrast and appear more smeared and smoothed in the quiet Sun. In addition, the fibrils in a plage are wider. Although the exposure time is 100 times longer for Mg images, the evidence suggests that these differences cannot be explained only with instrumental effects or the evolution of the solar scene. The differences at least partially arise because of different line-formation heights, the stronger response of Mg k emission peaks to the higher temperatures, and the larger height range sampled by the broad Mg filter used here. This is evidently manifested during the flare when a surge in Mg evolves differently than in Ca.</P>
AN IMPROVED PEMFC MODEL WITH A NEW INTERFACE MASS TRANSFER SUBMODEL WITHOUT EMPIRICAL COEFFICIENTS
Danilov, V. A.,Moon, I. Taylor Francis 2007 Chemical engineering communications Vol.194 No.11
<P> This study presents an improved 1-D PEM fuel cell model, which includes a new submodel for interface mass transfer in the presence of evaporation and condensation. In contrast with the conventional approach, this new submodel describes mass transfer under equilibrium conditions without the need for empirical coefficients. Polarization curves calculated with the improved model agree with experimental data from the literature. Simulation results illustrate the importance of evaporation and condensation in PEM fuel cells. The submodel developed here can also be used for heat and water management in PEMFC design.</P>
Danilovic, S.,Solanki, S. K.,Barthol, P.,Gandorfer, A.,Gizon, L.,Hirzberger, J.,Riethmü,ller, T. L.,van Noort, M.,Rodrí,guez, J. Blanco,Del Toro Iniesta, J. C.,Suá,rez, D. Orozco,Schmi American Astronomical Society 2017 The Astrophysical journal, Supplement series Vol.229 No.1
<P>Ellerman Bombs are signatures of magnetic reconnection, which is an important physical process in the solar atmosphere. How and where they occur is a subject of debate. In this paper, we analyze SUNRISE/IMaX data, along with 3D MHD simulations that aim to reproduce the exact scenario proposed for the formation of these features. Although the observed event seems to be more dynamic and violent than the simulated one, simulations clearly confirm the basic scenario for the production of EBs. The simulations also reveal the full complexity of the underlying process. The simulated observations show that the Fe I 525.02 nm line gives no information on the height where reconnection takes place. It can only give clues about the heating in the aftermath of the reconnection. However, the information on the magnetic field vector and velocity at this spatial resolution is extremely valuable because it shows what numerical models miss and how they can be improved.</P>
TRANSVERSE COMPONENT OF THE MAGNETIC FIELD IN THE SOLAR PHOTOSPHERE OBSERVED BY SUNRISE
Danilovic, S.,Beeck, B.,Pietarila, A.,Schü,ssler, M.,Solanki, S. K.,Martí,nez Pillet, V.,Bonet, J. A.,del Toro Iniesta, J. C.,Domingo, V.,Barthol, P.,Berkefeld, T.,Gandorfer, A.,Knö,lker IOP Publishing 2010 ASTROPHYSICAL JOURNAL LETTERS - Vol.723 No.2
임종구,( Danilov A. Valery ),조용훈,문일 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
최근 고유가로 인해 신에너지 개발에 대한 연구가 더욱 활발해지고 있다. 신에너지 중 연료전지에 대한 연구도 많이 진행되었고 일부분의 경우 상용화가 진행되고 있다. 그러나 실험에 의존하는 부분이 많아서 연구에 많은 시간과 연구비가 필요하다. 특히 연료가 흘러가는 유로의 경우 형상에 따라 연료전지의 성능에 많은 영향을 주는 것에도 불구하고 실험적으로 유로 내에서의 현상을 볼 수 없기 때문에 간과되어왔다. 이에 본 연구에서는 유동해석 기법 중 유한 체적법을 기본으로 하고 있는 범용 CFD인 FLUENT(ver. 6.1)를 이용하여 직접 메탄올 연료전지의 구성요소인 산화극과 환원극의 유로 내에서의 연료의 질량, 운동량, 에너지의 계산을 통해 속도, 압력, 농도 구배를 계산하였다. 사용된 모델은 전극면적 40cm2 전지로서 유로의 깊이와 넓이는 1mm로 설정하였다. 또한 FLUENT에서 제공하는 기본 지배방정식에 몇 가지 source term과 sink term을 추가, 수정하고 UDF를 이용하여 전기화학식을 적용한 새로운 subroutine 을 만들어 전류밀도의 분포와 과전압을 계산하였다. 개발된 모델을 다양한 유로 디자인에 적용하여 이에 따른 연료전지의 성능 변화를 평가하였다. 화학공학의 이론과 응용 제10권 제2호 2004년
문일,Valeri A. Danilov,Jongkoo Lim,Kyoung Hwan Choi 한국화학공학회 2006 Korean Journal of Chemical Engineering Vol.23 No.5
study presents a 3D CFD model for modeling gas evolution in anode channels of a DMFC underhigh stoichiometric feed. The improved two-phase model includes a new submodel for mass source and interphasetransfer in anode channels. Case studies of typical flow field designs such as parallel and serpentine flow fields illustrateapplications of the CFD model. Simulation results reveal that gas management of typical flow fields is ineffective undercertain operating conditions. The CFD-based simulations are used to visualize and to analyze the gas evolution andment in DMFC.
Single electron transistor with a single conjugated molecule
Sergey Kubatkin,Andrey Danilov,jean-Luc Br?as,Thomas Bj?nholm,Mattias Hjort,Jerome Cornil,Nicolai Stuhr-Hansen,Per Hedeg?d 한국물리학회 2004 Current Applied Physics Vol.4 No.5
We report on a single electron transistor (SET) where the electronic levels of a singlep-conjugated molecule control the electron transport properties. The molecule can be in several distinct charged states from +3 to)4. The experiment closely resembles electrochemical measurements allowing us to report on quantitative measurements of the redox potentials (or ionization potentials)of a single molecule in a solid state device. The molecular excitation energies extracted from the SET measurements are strongly correlated with electrochemical data. In contrast, the HOMOLUMO gap is strongly reduced in a solid state environment, ascompared to solution. We suggest that this surprising eect may be caused by image charges generated in the source and drain electrodes. They will result in a strong localization of the charges on the molecule.