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Fission Cross section Calculations of Actinides with EMPIRE Code
Mihaela Sin,Pavel Oblozinsky,Michal Herman,Roberto Capote 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Theoretical calculations of neutron induced reactions on ^(233,234,236)U, ^(237)Np, ^(238-242)Pu, ^(241,243)Am, ^(242-246)Cm carried out in the energy range 1 keV - 20 MeV with EMPIRE code are presented, with emphasis on the fission channel. Beside a consistent, accurate set of calculations, the paper contains arguments supporting the choice of the reaction models and input parameters. A special attention is paid to the fission model parameters and their uncertainties.
Mihaela Iordachescu,Heidi Bowman,Kentaro Sasaki,Ryozo Imai,Shigeru Satoh,Sven Verlinden 한국식물학회 2009 Journal of Plant Biology Vol.52 No.5
CEBP, a nuclear-encoded chloroplast protein, has been previously cloned as a putative transcription factor involved in ethylene signaling in carnation development and senescence. In order to more clearly define CEBP role and function, we carried out experiments to define its pattern of mRNA abundance and possible subcellular localization. Changes in CEBP mRNA abundance showed a dramatic drop from anthesis to open flower stage of development immediately preceding the ethylene climacteric associated with flower senescence. A similar but less dramatic decrease in CEBP was observed upon ethylene exposure, again before endogenous climacteric ethylene was observed. The pattern of CEBP mRNA abundance suggests a response to or involvement in the initial steps of the petal senescence process. GFP co-localization showed that a GFP–CEBP construct was directed to the nucleus, whereas a CEBP–GFP construct localized to the chloroplast. Nuclear localization was expected as CEBP was cloned as an ethylene-responsive element-binding protein or transcription factor. The role and function of CEBP in the chloroplast, however, remains unclear. Future lines of inquiry based on our results are discussed.
Nedelcu, Mihaela,Saifullah, Mohammad S. M.,Hasko, David G.,Jang, Arang,Anderson, David,Huck, Wilhelm T. S.,Jones, Geraint A. C.,Welland, Mark E.,Kang, Dae Joon,Steiner, Ullrich WILEY-VCH Verlag 2010 Advanced Functional Materials Vol.20 No.14
<B>Graphic Abstract</B> <P>This computer rendered graphic displays direct writing of sub-10 nm metallic wires of low line-width roughness using an electron beam (shown as a sinusoidal wave), as presented by M. S. M. Saifullah, D. J. Kang, U. Steiner, et al. on page 2317. Sub-10 nm metallic wires of good integrity and low line-width roughness were obtained by reducing electron-beam patterned metal naphthenate lines in a hydrogen-rich atmosphere at 500°C for 1 h. <img src='wiley_img_2010/1616301X-2010-20-14-ADFM201090059-content.gif' alt='wiley_img_2010/1616301X-2010-20-14-ADFM201090059-content'> </P>
Nedelcu, Mihaela,Saifullah, Mohammad S. M.,Hasko, David G.,Jang, Arang,Anderson, David,Huck, Wilhelm T. S.,Jones, Geraint A. C.,Welland, Mark E.,Kang, Dae Joon,Steiner, Ullrich WILEY-VCH Verlag 2010 Advanced Functional Materials Vol.20 No.14
<P>The fabrication of very narrow metal lines by the lift-off technique, especially below sub-10 nm, is challenging due to thinner resist requirements in order to achieve the lithographic resolution. At such small length scales, when the grain size becomes comparable with the line-width, the built-in stress in the metal film can cause a break to occur at a grain boundary. Moreover, the line-width roughness (LWR) from the patterned resist can result in deposited metal lines with a very high LWR, leading to an adverse change in device characteristics. Here a new approach that is not based on the lift-off technique but rather on low temperature hydrogen reduction of electron-beam patterned metal naphthenates is demonstrated. This not only enables the fabrication of sub-10 nm metal lines of good integrity, but also of low LWR, below the limit of 3.2 nm discussed in the International Technology Roadmap for Semiconductors. Using this method, sub-10 nm nickel wires are obtained by reducing patterned nickel naphthenate lines in a hydrogen-rich atmosphere at 500 °C for 1 h. The LWR (i.e., 3 σ<SUB>LWR</SUB>) of these nickel nanolines was found to be 2.9 nm. The technique is general and is likely to be suitable for fabrication of nanostructures of most commonly used metals (and their alloys), such as iron, cobalt, nickel, copper, tungsten, molybdenum, and so on, from their respective metal–organic compounds.</P> <B>Graphic Abstract</B> <P>Sub-10 nm nickel wires of good integrity are obtained by reducing electron-beam-patterned nickel naphthenate lines in a hydrogen-rich atmosphere at 500 °C for 1 h. The line-width roughness (i.e., 3 σ<SUB>LWR</SUB>) of these nickel nanolines is found to be 2.9 nm, which is below the limit of 3.2 nm discussed in the International Technology Roadmap for Semiconductors. <img src='wiley_img_2010/1616301X-2010-20-14-ADFM201000219-content.gif' alt='wiley_img_2010/1616301X-2010-20-14-ADFM201000219-content'> </P>
유기용매에 의하여 유발된 Aeromonas hydrophila B<sub>ct4</sub>의 변형
Lazaroaie, Mihaela Marilena 대한화학회 2009 대한화학회지 Vol.53 No.3
유기용매들에 대한 내성을 갖고 분해할 수 있는 능력을 가진 박테리아가 해수에서 단리되었지만, 해양조건에서 유기용매가 분해될 때 그들의 역할은 잘 알려져 있지 않았다. 콘스탄차 해수에서 단리된 Aeromonas hydrophila IB$B_{ct4}$는 여러 다른 종류의 유기용매들에 대하여 내성을 갖고 분해할 수 있는 능력을 가지고 있다. 옥탄올-헥산 혼합물에서 2.64 - 3.17 사이의 분배계수지수 (log $P_{ow}$)를 가진 톨루엔, 크실렌 이성질체들 및 에틸벤젠은, 3.69 - 4.39 사이의 log $P_{ow}$를 가진 프로필벤젠, n-헥산 및 n-헵탄보다 이들 박테리아에 더 독성이 있었다. Aeromonas hydrophila IB$B_{ct4}$에 유기용매들을 처리하였을 때 분자수준에서 세포의 변형이 유발되었다. 다른 유기용매들에 의하여 분자수준에서의 세포변화가 다르게 나타난다는 것을 밝힌 이 연구는 배양 조건에서 유기용매에 대한 박테리아 세포들의 반응이 복잡하다는 것을 보여 주고 있다. Many bacteria that are capable to tolerate and degrade organic solvents have been isolated from seawater. However, their roles in the biodegradation of organic solvents in the marine environment have remained unknown. Aeromonas hydrophila IB$B_{ct4}$, isolated from Constanta seawater, was able to tolerate and degrade different organic solvents. Toluene, styrene, xylene isomers, ethylbenzene, with the logarithm of the partition coefficient in octanol-water mixture (log $P_{ow}$) between 2.64 and 3.17, were more toxic for bacterial cells, compared with propylbenzene, n-hexane, n-heptane, with log $P_{ow}$ between 3.69 and 4.39. There were revealed cellular and molecular modifications induced by organic solvents to Aeromonas hydrophila IB$B_{ct4}$. The study of cellular and molecular modifications induced by different organic solvents showed a complex response of bacterial cells to the presence of organic solvents in the culture media.
Influence of hemp fibers with modified surface on polypropylene composites
Denis Mihaela Panaitescu,Cristian Andi Nicolae,Zina Vuluga,Catalin Vitelaru,Catalina Gabriela Sanporean,Catalin Zaharia,Dorel Florea,Gabriel Vasilievici 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
Hemp fibers (HF) were treated with g-Aminopropyltriethoxysilane, g-Glycidoxypropyltrimethoxysilane,g-Methacryloxypropyltrimethoxysilane (MPS) and potassium permanganate (KP), without alkalinepretreatment, to improve the mechanical properties of polypropylene (PP)/HF composites forautomotive parts. MPS and KP treatments were the most efficient in splitting HF bundles andseparation of elementary fibers and led to better micro- and nano-mechanical properties in composites. PP modulus-of-elasticity increased with 67% in PP/HF–MPS, with 69% in PP/HF–KP and with only 30% inPP/untreated fibers. KP led to mild oxidation of HF with good effect on mechanical properties and wasproposed as cheap and effective treatment of HF, easily applicable industrially.
Marta Stroescu,Anicuta Stoica-Guzun,Sorin Ion Jinga,Tanase Dobre,Iuliana Mihaela Jipa,Loredana Mihaela Dobre 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.9
Calcium carbonate was deposed on bacterial cellulose (BC) never-dried membranes in the presence of different concentrations of sodium dodecyl sulfate (SDS) and cetyl trimethylammonium bromide (CTAB) by a precipitation reaction between aqueous solutions of calcium chloride (CaCl2) and sodium carbonate (Na2CO3) containing,or not, surfactant in their composition. Different shapes of crystals were obtained from rhombohedral ones to flowerlike,depending on surfactant type and concentration. From the two surfactants tested, SDS has a greater influence on calcium carbonate morphology than CTAB. The only polymorph obtained in all studied cases was calcite. The composite films BC-calcite were characterized by means of scanning electron microscopy (SEM), X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FTIR) and color measurements. The obtained BC-calcium carbonate composites could be used in paper manufacturing.
Parametric study of energy dissipation mechanisms of hybrid masonry structures
Zhenjia Gao,Mihaela Nistor,Ilinca Stanciulescu 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.78 No.4
This paper provides a methodology to analyze the seismic performance of different component designs in hybrid masonry structures (HMS). HMS, comprised of masonry panels, steel frames and plate connectors is a relatively new structural system with potential applications in high seismic areas. HMS dissipate earthquake energy through yielding in the steel components and damage in the masonry panels. Currently, there are no complete codes to assist with the design of the energy dissipation components of HMS and there have been no computational studies performed to aid in the understanding of the system energy dissipation mechanisms. This paper presents parametric studies based on calibrated computational models to extrapolate the test data to a wider range of connector strengths and more varied reinforcement patterns and reinforcement ratios of the masonry panels. The results of the numerical studies are used to provide a methodology to examine the effect of connector strength and masonry panel design on the energy dissipation in HMS systems. We use as test cases two story structures subjected to cyclic loading due to the availability of experimental data for these configurations. The methodology presented is however general and can be applied to arbitrary panel geometries, and column and story numbers.