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61.
Nicolae Tomozeiu 《Thin solid films》2007,515(16):6582-6585
Silicon oxide (a-SiO) is one of the most used silicon-based materials in optoelectronic and microelectronic technology. It is well-known that the electronic properties are linked to the material structure, which depends on the deposition technique and on the details of the deposition. Silicon suboxide (a-SiOx 0 < x < 2) layers were prepared by r.f. magnetron-sputtering from a polycrystalline silicon target in a well defined oxidation environment.Optical Emission Spectroscopy (OES) was employed to study the plasma used in SiOx depositions. Theoretical calculations performed in the frame of electron impact excitation mechanism for argon and atomic oxygen corroborated with electron impact dissociation of the molecular oxygen have shown the strong influence of the electron temperature on the rate coefficients of photons' production.Correlation functions between the OES signals assigned to silicon and oxygen atoms from plasma (gas phase) and the SiOx layer composition (infrared and energy dispersive X-ray investigated) have been found. Based on these functions, the OES plasma monitoring is proposed as a tool to control in-situ and in direct time the SiOx layer composition. 相似文献
62.
Christo Angelov Wei Guan Nicolae Marian Feng Zhou Krzysztof Sierszecki S?ren Top 《Innovations in Systems and Software Engineering》2012,8(1):79-92
The widespread use of embedded systems requires the creation of industrial software technology that will make it possible
to engineer systems being correct by construction. That can be achieved through the use of validated (trusted) components,
verification of design models, and automatic configuration of applications from validated design models and trusted components.
This design philosophy has been instrumental for developing COMDES—a component-based framework for distributed embedded control
systems. A COMDES application is conceived as a network of embedded actors that are configured from instances of reusable,
executable components—function blocks (FBs). System actors operate in accordance with a timed multitasking model of computation,
whereby I/O signals are exchanged with the controlled plant at precisely specified time instants, resulting in the elimination
of I/O jitter. The paper presents an analysis technique that can be used to validate COMDES design models in SIMULINK. It
is based on a transformation of the COMDES design model into a SIMULINK analysis model, which preserves the functional and
timing behaviour of the application. This technique has been employed to develop a feasible (light-weight) analysis method
based on runtime observers. The latter are conceived as special-purpose actors running in parallel with the application actors,
while checking system properties specified in Linear Temporal Logic. Observers are configured from reusable FBs that can be
exported to SIMULINK in the same way as application components, making it possible to analyze system properties via simulation.
The discussion is illustrated with an industrial case study—a Medical Ventilator Control System, which has been used to validate
the developed design and analysis methods. 相似文献
63.
Compliance-based matrix method for modeling the quasi-static response of planar serial flexure-hinge mechanisms 总被引:1,自引:0,他引:1
A matrix method is proposed to model the direct and inverse quasi-static response of constrained/over-constrained planar serial mechanisms with flexure hinges under bending, axial, and shear planar (three-dimensional) loading and small-deformations. The method uses a basic three-point compliance matrix corresponding to one rigid link and one adjacent flexure hinge that are subjected to one point load. This matrix connects the displacements at a point on the rigid link with the load that is applied at another point on it, and the deformations of the flexure hinge at its distal point. The quasi-static model of planar serial flexure-based mechanisms with multiple links under single/multiple point loading results from linearly superimposing all relevant hinge-link-load triads defined by their three-point matrices. A displacement-amplification planar device with right circularly corner-fileted flexure hinges is studied using several refinement stages of the matrix method to generate a model whose predictions are confirmed by finite element simulation. 相似文献
64.
Ben Warner Tobias G. Gill Vasile Caciuc Nicolae Atodiresei Antoine Fleurence Yasuo Yoshida Yukio Hasegawa Stefan Blügel Yukiko Yamada‐Takamura Cyrus F. Hirjibehedin 《Advanced materials (Deerfield Beach, Fla.)》2017,29(43)
Atomically precise engineering of the position of molecular adsorbates on surfaces of 2D materials is key to their development in applications ranging from catalysis to single‐molecule spintronics. Here, stable room‐temperature templating of individual molecules with localized electronic states on the surface of a locally reactive 2D material, silicene grown on ZrB2, is demonstrated. Using a combination of scanning tunneling microscopy and density functional theory, it is shown that the binding of iron phthalocyanine (FePc) molecules is mediated via the strong chemisorption of the central Fe atom to the sp3‐like dangling bond of Si atoms in the linear silicene domain boundaries. Since the planar Pc ligand couples to the Fe atom mostly through the in‐plane d orbitals, localized electronic states resembling those of the free molecule can be resolved. Furthermore, rotation of the molecule is restrained because of charge rearrangement induced by the bonding. These results highlight how nanoscale changes can induce reactivity in 2D materials, which can provide unique surface interactions for enabling novel forms of guided molecular assembly. 相似文献
65.
Electrochemical reduction of carbon dioxide at ruthenium dioxide deposited on boron-doped diamond 总被引:1,自引:0,他引:1
Nicolae Spataru Kenichi Tokuhiro Chiaki Terashima Tata N. Rao Akira Fujishima 《Journal of Applied Electrochemistry》2003,33(12):1205-1210
Study of carbon dioxide reduction at RuO2-coated diamond electrodes showed that conductive metallic oxides are promising electrocatalysts for this process and allow higher reduction products to be obtained. The main reduction products obtained in acidic and neutral media were formic acid and methanol, with product efficiencies as high as 40 and 7.7%, respectively. It was observed that conductive diamond is a very well suited material for studying the electrocatalytic properties of conductive metallic oxides, because its use resulted in a negligible substrate effect. This feature will greatly enhance the ability to understand the relationships between the intrinsic electrochemical behavior and the electrocatalytic behavior, in view of developing new effective electrocatalysts. The use of conductive diamond could also allow better utilization of the electrocatalyst by avoiding the need for thick films. 相似文献
66.
The integrodifferential equations of the equivalent circuit are solved, and the operating characteristics are derived for a currentfed thyristor inverter. This inverter can be especially useful as a highfrequency power source for induction heating. 相似文献
67.
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69.
A new trapping effect of a three-level atom in interaction with a bimodal cavity field is proposed. This problem consists of the possibility for realization of initially separated states of an atom and an electromagnetic field after interaction. The quantum properties of a bimodal field, which satisfy the reversible conditions for the atom flying through the cavity, were studied. 相似文献
70.
Zina Vuluga Denis Mihaela Panaitescu Constantin Radovici Cristian Nicolae Michaela Doina Iorga 《Polymer Bulletin》2012,69(9):1073-1091
A simultaneously increase in stiffness and toughness is needed for improving polypropylene (PP) competitiveness in automotive industry. The aim of this paper is to investigate the effects of styrene-(ethylene-co-butylene)-styrene triblock copolymer (SEBS) on mechanical and thermal properties of PP, in the presence and the absence of nanoclay. The amount of SEBS in PP was ranged to obtain the matrix with the most favorable stiffness–toughness balance. For this purpose, SEBS domain size and distribution in PP/SEBS blends was determined by means of atomic force microscopy and correlated with mechanical properties. The influence of SEBS on the crystalline structure of PP in PP/organoclay nanocomposites was investigated by X-ray diffraction and differential scanning calorimetry, a synergistic effect of SEBS and nanoclay being pointed out. Moreover large improvement in the impact strength (almost 22 times) was obtained in the case of SEBS-containing nanocomposite in comparison with the composite without SEBS. 相似文献