Materials Literature
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The scattered electron energy-loss spectrum due to the excitation of the 4p 5 n 1 l 1 n 2 l 2 states in rubidium atoms was measured at 25.6 eV impact energy. New optically forbidden non-autoionizing states located between 16.5 and 16.8 eV were observed.
A simple model of electron transmission in thin film targets permits absolute measurement of cross section for electron-induced damage in such films of DNA and DNA complexed with 1-3 diaminopropane.
The transmission of electrons through a tapered glass capillary was observed for 1000 eV incident electrons up to tilt angles of ~9.5°. Tilt angle dependence of the energy loss broadening shows clear correspondence of elastic and inelastic processes. Both were found for smaller tilt angles.
Secondary electron emission yields in forward and backward direction from carbon foils (thickness of 74 nm) induced by O 2+ ions of energies form 1.9 keV/u to 11.3 keV/u have been measured. We find that the forward and the backward electron emission yields increase with the projectile kinetic energy. Further studies s…
Fragmentation of amino acids NH 2 -(CH 2 ) n -COOH ( n =1 glycine; n =2 β-alanine and n =3 γ-aminobutyric acid GABA) following collisions with slow highly charged ions has been studied in the gas phase by a combined experimental and theoretical approach. In the experiments, a multi-coincidence detection method was use…
We performed measurements using low energy carbon ions (200 eV and 1000 eV) as projectile and tungsten surface as target. The main aim of our work was to get data for the sputtering yields in this projectile and target combination. Surprisingly, instead of the weight loss of the target material, we obtained weight gai…
Absolute total cross sections for electron scattering from He and Ne at electron energies ranging from 6 meV to 20 eV were obtained with the experimental technique employing the threshold-photoelectron source. The measured total cross sections were compared with previous experimental and theoretical cross sections.
Electron scattering from pyrimidine (C 4 H 4 N 2 ) was investigated over a wide range of energies. Following different experimental and theoretical approaches, total, elastic and ionization cross sections as well as electron energy loss distributions were obtained.
Single molecule magnets (SMM) deposited in submonolayers and monolayers have been analyzed with respect to their structures by means of non-contact AFM (topographic as well as damping mode) and Kelvin Probe Force Microscopy with molecular resolution.
Photoelectron emission from the valence band of aluminum and beryllium surfaces by ultra-short laser pulses is studied within the Band-Structure-Based - Volkov (BSB-V) approximation, which takes into account the contribution of the band structure of the solid. We found that band structure effects are extremely importa…
본 연구에서는 Ni metal foam 플레이트의 수증기 개질반응 및 표면 특성을 조사하였다. 전처리를 통하여 Ni의 산화상태를 변화시킬 수 있었으며, 활성 site로서 표면에 노출된 metallic Ni 종은 수증기 개질 반응활성에 중요한 역할을 한다. 또한 Ni metal foam 플레이트의 기공제어 및 촉매 기능을 부여하기 위하여 Ni metal foam 플레이트와 Ni-YSZ 촉매를 혼합하여 다공성 촉매 분리막을 제조하였다. SEM 분석 결과 metal foam 플레이트의 기공을 제어할 수 있었으며, 표면에 Ni-YSZ 촉매는 고르게 잘 분포되어 있었다. N…
A Monte Carlo simulation, taking into account of the detailed surface roughness of a realistic solid sample, has been performed to study the surface topography influence on elastic peak intensity. To describe quantitatively the surface topography effect, here we introduce surface roughness parameter (SRP) according to…
This research addresses the thermal transport in carbon nanofiber (CNF)/epoxy composites via finite element modeling. The effects of nanofiber orientation on thermal transport are investigated through Fourier’s Law of heat conduction and through simulation of a high magnitude, short heat pulse. The effect of interface…
Seiring dengan perkembangan serta kemajuan ilmu pengetahuan dan teknologi, mengakibatkan berkembangnya pula bidang-bidang kegiatan manusia. Salah satunya adalah berkembangnya bidang industri permesinan. Proses permesinan yang dilakukan secara terus menerus misalnya pada pengeboran akan menyebabkan aus nya mata bor yan…
In this thesis, we study charge and spin dynamics in nanostructures such as quantum dots and small ferromagnetic clusters. These systems are brought out of equilibrium by an external perturbation like the coupling to electron baths or an abrupt change of electric fields. To investigate the interactions and mechanisms…
O estudo da microestrutura das juntas soldadas dos aços inoxidáveis super duplex reveste-se de grande importância, devido a sua aplicação crescente na industria, notadamente naval e de petróleo. Durante a soldagem desses aços, há duas ocorrências principais, devido à evolução da microestrutura durante o processo de re…
This thesis presents the results of an intensive research activity into the characterization and modeling of the structural behavior of woven fabric composites. The experimental characterization includes static and fatigue testing of notched and unnotched specimens, for both on-axis and off-axis loads. Numerical Analy…
采用湿化学–后续热处理技术, 合成了掺钴尖晶石锰酸锂材料。X射线衍射(XRD)分析结果表明, 钴的掺入没有改变材料的Fd3m结构。扫描电子显微镜(SEM)分析表明, 所合成的材料颗粒均匀, 形貌规整, 粒径分布较窄。透射电子显微镜(TEM)结果表明, Li 1.035 Co 0.035 Mn 1.930 O 4 具有完好的结晶态。充放电测试结果表明, 在室温下钴掺杂能够提高材料的电性能。当产物为Li 1.035 Co 0.035 Mn 1.930 O 4 时, 其电性能达到最优: 以0.5 C 充放电，首次放电容量为113 mAh/g, 经过100次循环后容量保持率为93.8%, 经过4 C 放电后仍然能够保持0.5 C 放电容量…
Argan Oil (AO) was tested as inhibitor for copper corrosion in 2 M H3PO4 and NaCl 0.3 M. The techniques used in this work were weight loss measurements, potentiodynamic polarisation and Electrochemical Impedance Spectroscopy (EIS). The inhibition efficiency was found to increase with inhibitor content to attain 94% fo…
Steel is the main material of an industry. In a world of steel metallurgy has a character different from the microstructure to mechanical properties. It is therefore very important to know well the character of a steel that can be used as needed. If it is not appropriate in selecting a material, there will be a failur…