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Another approach in enhancing the light extraction efficiency of AlGaInP LED was accomplished using a surface roughening process. In this process, the Au(170 nm)/AuBe(260 nm)/Au(170 nm) ohmic contact layers were first deposited on the GaP window layer. After the alloy annealing process (480°C for 10 min), the Be atoms will diffuse into the GaP top layer and form non-uniform clusters. The LED samples were then immersed into a mixture 3H3PO4:1H2O2:1H2O solution for 6 min, resulting in a rough GaP surface. The luminous intensity of the AlGaInP LED can increase from 42 to 50 mcd, that is, an 18% enhancement can be achieved via the present non-photolithography surface roughening process.Keywords: LED, AlGaInP, Cu substrate, Reflector, Surface roughening

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Active galactic nuclei activity in the form of expression in:(1) intense light changes, that is, optical and radio radiation intensity over time, there are Big changes;(2) is very strong luminosity, even more than the Eddington luminosity;(3) significant non-thermal radiation, especially in the infrared region of the non-thermal radiation reached the maximum;(4) a strong movement and a huge gas jet stream.

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Based on the principle of light-pen mode non-track three dimensional coordinate measuring technology, the paper uses PSD as the photoelectric receiver and point light modulated by frequency to measure coordinates.

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The aim of this study was to reveal the adaptation response of limestone plants to light and water. The light response curves of limestone plants Alchornea trewioides, Bauhinia championii, Pteroceltis tatarinowii, Sapium rotundi folium were measured with Licor-6400 Photosynthesis Analyzer in Karst area, and parameters of photosynthesis were simulated by non-rectangle hyperbolae function.

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