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Search Results: 1 - 10 of 5066 matches for " Coupling Interface "
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Optical Properties of the Coupling Interface for Planar Optical Waveguides  [PDF]
Yu Zheng, Ji-An Duan
Optics and Photonics Journal (OPJ) , 2011, DOI: 10.4236/opj.2011.13018
Abstract: Planar optical waveguides are the key elements in a modern, high-speed optical network. An important problem facing the optical fiber communication system, specifically planar optical waveguides, is coupling. The current study presents a coupling model for planar optical waveguides and optical fibers. The various effects of the optical properties of the coupling interface were analyzed by the scalar finite difference beam propagation method, including the thickness, with or without the matching refractive index of the interface adhesive. The findings can serve as a guide for planar optical waveguide packaging.
Coupled maps serving the exchange processes on the environmental interfaces regarded as complex systems  [PDF]
Dragutin T. Mihailovic, Mirko Budincevic, Igor Balaz, Sinisa Crvenkovic, Ilija Arsenic
Natural Science (NS) , 2012, DOI: 10.4236/ns.2012.48076
Abstract: We have defined the environmental interface through the exchange processes between media forming this interface. Considering the environmental interface as a complex system we elaborated the advanced mathematical tools for its modelling. We have suggested two coupled maps serving the exchange processes on the environmental interfaces spatially ranged from cellular to planetary level, i.e. 1) the map with diffusive coupling for energy exchange simulation and 2) the map with affinity, which is suitable for matter exchange processes at the cellular level. We have performed the dynamical analysis of the coupled maps using the Lyapunov exponent, cross sample as well as the permutation entropy in dependence on different map parameters. Finally, we discussed the map with affinity, which shows some features making it a promising toll in simulation of exchange processes on the environmental interface at the cellular level.
An Atomic Force Microscopy Study of the Interactions Involving Polymers and Silane Networks
Oréfice, Rodrigo L.;Brennan, Anthony;
Polímeros , 1998, DOI: 10.1590/S0104-14281998000400012
Abstract: abstract: silane coupling agents have been frequently used as interfacial agents in polymer composites to improve interfacial strength and resistance to fluid migration. although the capability of these agents in improving properties and performance of composites has been reported, there are still many uncertainties regarding the processing-structure-property relationships and the mechanisms of coupling developed by silane agents. in this work, an atomic force microscope (afm) was used to measure interactions between polymers and silica substrates, where silane networks with a series of different structures were processed. the influence of the structure of silane networks on the interactions with polymers was studied and used to determine the mechanisms involved in the coupling phenomenon. the afm results showed that phenomena such as chain penetration, entanglements, intersegment bonding, chain conformation in the vicinities of rigid surfaces were identified as being relevant for the overall processes of adhesion and adsorption of polymeric chains within a silane network. afm adhesion curves showed that penetration of polymeric chains through a more open silane network can lead to higher levels of interactions between polymer and silane agents.
Magnetic property and interface structure of Ta/NiO/NiFe/Ta
Guanghua Yu,Chunlin Chai,Fengwu Zhu,Jimei Xiao
Chinese Science Bulletin , 2001, DOI: 10.1007/BF03183284
Abstract: Ta/NiO/NiFe/Ta multilayers, utilizing Ta as buffer layer, were prepared by rf reactive and dc magnetron sputtering. The exchange coupling field between NiO and NiFe reached a maximum value of 9.6 ×103 A/m at a NiO film thickness of 50 nm. The composition and chemical states at interface region of Ta/NiO/Ta were studied by using the Xray photoelectron spectroscopy (XPS) and peak decomposition technique. The results show that there is an “intermixing layer” at the Ta/NiO (and NiO/Ta) interface due to a thermodynamically favorable reaction 2Ta + 5NiO = 5Ni + Ta2O5. This interface reaction has a great effect on exchange coupling. The thickness of Ni+NiO estimated by XPS depthprofiles is about 8–10 nm.
Characteristics and laws of MODS coupling relation in arid zone under global change
Ranghui Wang,Huizhi Zhang,Qing Huang
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-8210-3
Abstract: Global change has influenced the distribution pattern and spatio-temporal changes of resources in arid zone, and has restrained the land use and land cover change, which is shown by water-heat state, landscape structure, climate effect, and human activities. The above-mentioned characteristics have a close coupling relation with the mountain-oasis-desert system (MODS). The climate in Central Asia arid zone is warm and wet, which is different from that in northern China which takes a tendency of aridity, and the mechanism has restricted the characteristics and laws of MODS. Systematic interface characteristics and process, especially the formation, transformation and consumption laws of water resource reflect directly MODS’s response to global change in arid zone. Spatio-temporal pattern, dynamic change, scale change and coupling mode of MODS reflect the ecology mechanism between the systems and within the systems.
Theoretical study on dispersion relation of one-dimensional copolymers

Zhang Da-Cheng,Cheng Jie,Liu De-Sheng,Xie Shi-Jie,

物理学报 , 2004,
Abstract: Lattice vibration of one-dimensional copolymer chains was studied and the dispersion relation was obtained numerically. The character of the vibration modes was recognized. It was found that the interface modes may appear if the homopolymer blocks have a strong interaction with each other, whose frequencies lie in the band gap between the acoustic and optical branches or between two optical branches. The character of the organic quantum well or superlattice of a copolymer chain was discussed from the view point of vibration modes.
Spin polarization study on one-dimensional ferromagnetic metal/conjugatd polymers

Fu Ji-Yong,Ren Jun-Feng,Liu De-Sheng,Xie Shi-Jie,

物理学报 , 2004,
Abstract: We investigated theoretically the properties of spin polarization in organic polymer contacting magnetic atoms. Dependence of the spin polarization on the strength of the electron-phonon coupling in a polymer and the spin-dependent effect of the interface coupling were discussed. By modulating the strength of spin splitting, we found that the spin polarization within an organic chain is weaker than that within a metal chain, but stronger than that within a semiconductor.


物理学报 , 2000,
Abstract: We proposed a tight-binding model for diblock copolymers. Electronic structure calculations presented for poly(p-phenylene)/polyacetylene revealed that the band gap of copolymers can be tuned by changing the concentration ratio of the homopolymers. The effect of homopolymer interactions on the band structure of copolymers has been studied. The results were compared with the known experimental data.
Dependence of electronic-transport sensitivity on the coupling between single molecule and atomic-chain electrode

Wang Li-Guang,Chen Lei,Yu Ding-Wen,Li Yong,Terence K S W,
,陈蕾,郁鼎文,李勇,Terence K S W

物理学报 , 2007,
Abstract: The electronic transport sensitivity depending on the coupling interface between a phenalenyl molecule and atomic chain lead in three-electrode single-molecular device is theoretically modeled and studied using self-consistent tight-binding method. Electronic transmission probabilities are obtained by changing the hopping integral on the interface. The result shows that the electron transmission probability lowers as the coupling strength becomes weak. Not only the transmission probability shows high peaks, but also the transmission energy bands become wider as the coupling strength increases. A novel property of the symmetrical three-electrode phenalenyl molecule device acting as a good plus-minus energy switch without source is discovered.

WANG Xiaobin,WU Xuqin,LIN Yongwei,HAN Chongjia,ZHANG Yuanmin,

材料研究学报 , 1990,
Abstract: The reaction between silane coupling agent/SiO_2 and epoxy resin withoutcuring agents has been studied by means of FT-IR and XPS.Bothr-aminopropyltrimethoxysilane(r-APS)and r-sulfhydrylpropyltrimethoxysilane(r-SPS)on SiO_2 can react with epoxy resin.However,r-methacryloxypropyltrimethoxysilane(r-MPS)on SiO_2 can not react with epoxy resin.The chemical structures before and afterreaction have been characterized on the molecular level and the possible reaction mecha-nisms have also been proposed.
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