将TRIZ(theory of inventive problem solving)技术冲突解决原理应用于一种新型节能装置的研究,首先对现有的节能装置作了调查,对其节能率低进行分析,然后针对各节能增力设备的需求,基于TRIZ理论的技术矛盾分析解决理论,分析、选择、确...将TRIZ(theory of inventive problem solving)技术冲突解决原理应用于一种新型节能装置的研究,首先对现有的节能装置作了调查,对其节能率低进行分析,然后针对各节能增力设备的需求,基于TRIZ理论的技术矛盾分析解决理论,分析、选择、确定了可行的发明原理,给出了重力节能装置的创新性设计方案,从而显著提高节能效果。实现能量的高效节省,最后对该节能装置的应用价值及前景作进一步展望。展开更多
A single-mode optical fiber with a convex chromatic dispersion profile is proposed for generating a flat supercontinuum(SC).The fiber has normal dispersion and the dispersion parameter D(λ,z) is a convex function of ...A single-mode optical fiber with a convex chromatic dispersion profile is proposed for generating a flat supercontinuum(SC).The fiber has normal dispersion and the dispersion parameter D(λ,z) is a convex function of wavelengths.It is shown from the numerical results that the chromatic dispersion,the flatness of the dispersion curve and the pump conditions have significant effect on SC generation.A flat and broad SC without strong residual pump component can be obtained when the pump wavelength is set in the vicinity of the wavelength at which the fiber has small normal group-velocity dispersion(GVD) and small dispersion slope.The fiber with a smaller normal GVD,a flatter dispersion profile and a higher nonlinear coefficient are more suitable for broad SC generation.展开更多
The band structures of flexural waves in a phononic crystal thin plate with straight, bending or branching linear defects are theoretically investigated using the supercell technique based on the improved plane wave e...The band structures of flexural waves in a phononic crystal thin plate with straight, bending or branching linear defects are theoretically investigated using the supercell technique based on the improved plane wave expansion method. We show the existence of an absolute band gap of the perfect phononic crystal and linear defect modes inside the gap caused by localization of flexural waves at or near the defects. The displacement distributions show that flexural waves can transmit well along the straight linear defect created by removing one row of cylinders from the perfect phononic crystals for almost all the frequencies falling in the band gap, which indicates that this structure can act as a high efficiency waveguide. However, for bending or branching linear defects, there exist both guided and localized modes, and therefore the phononic crystals could be served as waveguides or filters.展开更多
文摘将TRIZ(theory of inventive problem solving)技术冲突解决原理应用于一种新型节能装置的研究,首先对现有的节能装置作了调查,对其节能率低进行分析,然后针对各节能增力设备的需求,基于TRIZ理论的技术矛盾分析解决理论,分析、选择、确定了可行的发明原理,给出了重力节能装置的创新性设计方案,从而显著提高节能效果。实现能量的高效节省,最后对该节能装置的应用价值及前景作进一步展望。
基金National Basic Research Program of China(2003CB314906)
文摘A single-mode optical fiber with a convex chromatic dispersion profile is proposed for generating a flat supercontinuum(SC).The fiber has normal dispersion and the dispersion parameter D(λ,z) is a convex function of wavelengths.It is shown from the numerical results that the chromatic dispersion,the flatness of the dispersion curve and the pump conditions have significant effect on SC generation.A flat and broad SC without strong residual pump component can be obtained when the pump wavelength is set in the vicinity of the wavelength at which the fiber has small normal group-velocity dispersion(GVD) and small dispersion slope.The fiber with a smaller normal GVD,a flatter dispersion profile and a higher nonlinear coefficient are more suitable for broad SC generation.
基金Project (Nos 10632020 and 90715006) supported by the National Natural Science Foundation of China
文摘The band structures of flexural waves in a phononic crystal thin plate with straight, bending or branching linear defects are theoretically investigated using the supercell technique based on the improved plane wave expansion method. We show the existence of an absolute band gap of the perfect phononic crystal and linear defect modes inside the gap caused by localization of flexural waves at or near the defects. The displacement distributions show that flexural waves can transmit well along the straight linear defect created by removing one row of cylinders from the perfect phononic crystals for almost all the frequencies falling in the band gap, which indicates that this structure can act as a high efficiency waveguide. However, for bending or branching linear defects, there exist both guided and localized modes, and therefore the phononic crystals could be served as waveguides or filters.
