排序方式: 共有17条查询结果,搜索用时 15 毫秒
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放大视读屏技术研究 总被引:1,自引:1,他引:0
现行的照明用具一般体积较大、不易随身携带且不具备图像放大能力,为了给广大学习者尤其是视力不佳者提供一种全新的学习照明装置,设计了一种便携式放大视读屏.它具有柔光照明和图像放大双重功能:该屏利用梯形波导板的受抑全内反射原理,将侧面导入的LED光束从上下表面导出,实现了均匀的柔光照明功能;同时利用模压在波导板下表面的菲涅耳透镜实现了可调的图像放大功能.根据上述设计原理,通过ZEMAX软件对该视读屏的工作效果进行了理论模拟和参数优化,并制作了一块120 min×80 min×4 mm的视读屏,结果表明照明光线均匀柔和、放大效果清晰一致,成功实现了柔光照明和图像放大双重功能. 相似文献
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A photonic crystal fibre (PCF) surface enhanced Raman scattering (SERS) sensor is developed based on silver nanoparticle colloid. Analyte solution and silver nanoparticles are injected into the air holes of PCF by a simple modified syringe to overcome mass-transport constraints, allowing more silver nanoparticles involved in SERS activity. This sensor offers significant benefit over the conventional SERS sensor with high flexibility, easy manufacture. We demonstrate the detection of 4-mercaptobenzoic acid (4-MBA ) molecules with the injecting way and the common dipping measurement. The injecting way shows obviously better results than the dipping one. Theoretical analysis indicates that this PCF SERS substrate offers enhancement of about 7 orders of magnitude in SERS active area. 相似文献
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合成了一类Fmoc保护二肽凝胶因子(Fmoc-Lys(Fmoc)-Tyr-OR, R==Me, Et, Hex),, 并通过加热溶解-冷却静置方法测试了其凝胶性能。. 它们可在多种脂肪醇类溶剂中形成有机凝胶,, 并且具有热可逆性。. 通过透射电镜发现,, R为Me的凝胶因子在正己醇中可自组装成纳米级纤维状结构,, 相互交织使溶剂得以固定形成半透明凝胶,, 而在正丙醇中则倾向自组装成多刺球状,, 形成不透明白色凝胶。. IR及荧光光谱分析结果表明氢键与π-π stacking作用参与了其凝胶化自组装,, 同时氢键在凝胶态的强度较其固态时降低。. 该结果也从XRD数据中得以进一步证实。 相似文献
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A novel COB(chip-on-board) structure with integrated multifunction is presented.The structure is prepared by laminating copper plate with FR4 board and then coating with a silver layer to offer high reflectivity and high conductivity.In comparison with MCPCB(aluminum) and ceramics(Al2O3) board,the substrate brings about 10%higher light extracting efficiency than aluminum board and 5%higher flux maintenance ratio than ceramics(Al2O3) board at 3000 h.With integrated multifunction,through an IC component driving high voltage serial LED chips,the COB can be directly connected to AC 110 V or 220 V power supply in lighting application. 相似文献
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表面等离子体共振传感器研究的新进展 总被引:8,自引:4,他引:4
表面等离子体共振传感器具有灵敏度高、免标记及检测快速等优点,在生命科学、药物开发、公共安全、环境污染检测等领域具有广阔的应用前景。高灵敏度、小型化、集成化、低成本、高可靠性是未来表面等离子共振传感器发展的主要方向。介绍了棱镜耦合复合结构表面等离子体共振传感器在提高灵敏度和分辨率方面的研究新进展,重点论述了光纤表面等离子体共振传感器的研究现状和发展趋势,并对高通量、多组分识别表面等离子体成像技术以及金属微纳结构(颗粒)局域表面等离子共振传感技术的应用前景进行了讨论。 相似文献
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