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1.
Lighting sources with full-color visible output are widely preferred in practical applications. In addition, modern lighting sources also tend to be intelligentized, and the intelligentization asks for smart luminescence materials. In this work, we attempt to develop novel full-color emitting material with temperature sensing and thermochromatic ability. To this end, the Cu2+ is successfully reduced to Cu+ which is incorporated into the germanate glasses. The glasses are prepared via a melt-quenching technique using graphite powders as reducing reagent. The supper-broadening of the excitation and the emission spectra of Cu+ in the germanate glasses are observed. Full-color emission is realized by introducing Tm3+ as co-dopant to provide the blue component in the spectra. The energy transfer behavior between Cu+ and Tm3+ is investigated, and it is found that these two luminescence centers are independently existent without energy transfer between them. The chromatic properties of the Cu+/Tm3+ co-doped glasses are tuned by Tm3+ concentration and excitation wavelength. The temperature sensing based on the fluorescence intensity ratio technique is demonstrated, and a constant sensitivity for the temperature detection is obtained. Moreover the thermochromatic property is also investigated, and it is found that the studied Cu+/Tm3+-doped glasses exhibit excellent thermochromatic performance.  相似文献   
2.
以柠檬酸为络合剂采用溶胶-凝胶法制备了(Y1-xTmx)2Zr2O7(x=0.005,0.01,0.03,0.05)荧光粉.采用X-射线衍射分析仪(XRD)、扫描电子显微镜(SEM)和荧光光谱仪分别检测了Y2Zr2O7∶Tm3+的晶体结构、颗粒形貌以及样品的荧光光谱.XRD图谱表明,所得到的产物Y2Zr2O7∶Tm3+为单一相的萤石结构,而且Tm3+的掺杂并没有改变其晶体结构.荧光光谱的测试表明,在359 nm波长的紫外光激发下,1000℃下烧结的(Y1-xTmx)2Zr2O7(x=0.01)样品的发光性能最好,发射峰对应于Tm3+的1D2→3F4跃迁和1G4→3H6跃迁,并对其发光机理进行了探讨.样品在454 nm处的发光强度随Tm3+离子掺杂浓度的增加先升高后降低,即出现了浓度猝灭的现象,当Tm3+掺杂浓度摩尔百分比为1%时,样品的发光强度达到最大.  相似文献   
3.
通过理论与实验研究了光学厚度对Tm3+:YAG材料光谱烧孔孔深的影响。提出了一种用于分析光学厚度对光谱烧孔孔深影响的新模型。该模型从理论上推导了烧孔孔深与光学厚度的关系。根据提出的理论模型,当温度大于4K时,通过选择合适的光学厚度可以使光谱烧孔孔深得到最大值。最后通过使用合适的激光与Tm3+:YAG材料所形成的光谱烧孔实验证明了实验结果与理论分析是相一致的。  相似文献   
4.
Through a hydrothermal route, the Er3+and Tm3+co-doped SrYbF5 nanosheets were synthesized. The resulting samples were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy and luminescence spec-tra. Under the excitation of 980 nm laser irradiation, the upconversion emissions of Tm3+ions centered at 474 nm (1G4→3H6), 679 nm (3F2→3H6), 699 nm (3F3→3H6), 803 nm (3H4→3H6) and emissions of Er3+ions centered at 522 nm (2H11/2→4I15/2), 543 nm (4S3/2→4I15/2), 654 nm (4F9/2→4I15/2) were observed. The upconversion emissions of Er3+ions were adjusted by the concentration of Tm3+ions. The energy transfer mechanisms among Er3+-Yb3+-Tm3+in SrYbF5 nanosheets were discussed.  相似文献   
5.
刘波波  邓泽怀 《电子科技》2014,27(3):133-135,139
掺铥光纤激光器输出的2 μm波段在医疗、激光雷达、遥感测控和光参量振荡方面有着广泛应用,目前已实现千瓦级的激光输出。文中主要介绍了掺铥光纤激光器的基本结构及工作原理,并综述和分析了国内外掺铥光纤激光器的研究进展,并展望了掺铥光纤激光器的发展。  相似文献   
6.
7.
An efficient near-infrared (NIR) downconversion (DC) by converting broadband ultraviolet (UV) into NIR was demonstrated in YVO4:Tm3+,Yb3+ phosphors. The phosphors were extensively characterized using various methods such as X-ray diffraction, photoluminescence excitation, photoluminescence spectra and decay lifetime to provide supporting evidence for DC process. Upon UV light varying from 260 to 350 nm or blue light (473 nm) excitation, an intense NIR emission of Yb3+ corresponding to transition of 2F5/2→2F7/2 peaking at 985 nm was generated. The visible emission, the NIR mission and the decay lifetime of the phosphors of various Yb3+ concentrations were investigated. Experimental results showed that the energy transfer from vanadate group to Yb3+ via Tm3+ was very efficient. Application of the broadband DC YVO4:Tm3+,Yb3+ phosphors might greatly enhance response of siliconbased solar cells.  相似文献   
8.
利用激光速率方程理论,对Tm,Ho激光系统计算预测得出最佳耦合输出透过率和调Q激光脉冲宽度.实验采用Tm, Ho:LuLF为增益介质,三向侧面泵浦,环形腔声光调Q.选用透过率20%和30%的输出镜作对比.在透过率20%耦合输出时,得到调Q激光脉冲能量最大为58.0 mJ,对应光光转换效率为1.45%;在透过率30%耦合输出时,得到调Q激光脉冲能量最大为62.9 mJ,对应光光转换效率1.57%,并且获得了最大动静比48.7%.激光脉冲宽度在注入能量3.25 J时为417.2 ns.与理论计算结果较为一致.  相似文献   
9.
Abstract

Abstract

Tm doped TiO2 nanoparticles have been synthesised by hydrolysis-precipitation method. The effect of heat treatment on the crystal phase and photocatalytic activity of Tm doped TiO2 nanoparticles has been studied. The prepared samples were characterised by transmission electron microscopy, X-ray diffraction, Fourier transformed infrared and diffuse reflection spectrum analysis. The results show that Tm3+ doping can effectively inhibit the phase transformation from antase to rutile and decrease the crystallite size of nano-TiO2 particles. There is an optimal Tm doping (1·4?mol.-%) after calcination at 550°C for the photocatalytic activity of methylene blue degradation.  相似文献   
10.
2μm掺铥光纤(TDF)激光器在遥感、激光雷达、探测、医疗、光学参量振荡等方面有着重要的应用,近年来得到了快速的发展,目前已实现千瓦级的激光输出。主要介绍了掺铥光纤激光器的基本原理,以及近年来国内外的研究进展与应用。最后对掺铥光纤激光器的发展进行展望。  相似文献   
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