[Objective]The paper was to study effect of Lupo compound microemulsion( LCW) on Alternaria alternata. [Method]The activity of spore germination and mycelial growth was investigated by filter paper method and mycelial...[Objective]The paper was to study effect of Lupo compound microemulsion( LCW) on Alternaria alternata. [Method]The activity of spore germination and mycelial growth was investigated by filter paper method and mycelial growth rate method,and field test was also conducted to determine the effect of LCW on tobacco plants. [Result]LCW could inhibit spore germination and mycelial growth of A. alternate. The higher concentration led to more severe reduction of sporulation and heavier inhibition against mycelial growth. When LCW was diluted into 200 times,inhibition rate of sporulation reached 91. 23%,and the inhibition rate of mycelial growth reached 93. 50%. Field test also proved that LCW had significant inhibitory effect on tobacco brown spot disease. [Conclusion]The study provided the reference for using botanical pesticide to control A. alternate in fields.展开更多
A comprehensive investigation is carried out to compare the spectroscopic properties, absorption saturation behaviors and lasing properties of a Yb ion in tetragonal LuPO4 and LuVO4 isomorphic crystals. Significant di...A comprehensive investigation is carried out to compare the spectroscopic properties, absorption saturation behaviors and lasing properties of a Yb ion in tetragonal LuPO4 and LuVO4 isomorphic crystals. Significant distinctions are revealed in many aspects of the lasing behavior for the Yb ion doped in the two crystal hosts, and Yb：LuPO_4 proves to be superior to Yb：LuVO4 since it enables efficient laser action to be much more easily achieved. With a 0.6 mm thick crystal plate of Yb：LuPO4, an output power of 3.30 W can be generated with an optical–optical conversion efficiency of 50.8%; whereas with a 2 mm long miniature crystal rod, the output power produced can reach 8.35 W with an optical–optical conversion efficiency of 46.7%.展开更多
Tb^（3＋） and Yb^（3＋） codoped LuPO_4 phosphors were prepared by the reverse-strike co-precipitation method.The obtained LuPO_4：Tb^（3＋）,Yb^（3＋） phosphors were characterized by X-ray diffraction（XRD）,photol...Tb^（3＋） and Yb^（3＋） codoped LuPO_4 phosphors were prepared by the reverse-strike co-precipitation method.The obtained LuPO_4：Tb^（3＋）,Yb^（3＋） phosphors were characterized by X-ray diffraction（XRD）,photoluminescence（PL） spectra and decay kinetics to understand the near-infrared quantum cutting（QC） phenomena.The XRD results showed that all the phosphors exhibited good crystallinity and had a pure tetragonal phase of LuPO_4.The experimental results showed that the strong green emission around 545 nm from Tb^（3＋）（~5D_4→~7F_5） and near-infrared（NIR） emission at 1003 nm from Yb^（3＋）（~2F_（5/2）→~2F_（7/2）） of LuPO_4：Tb^（3＋）,Yb^（3＋）phosphors were observed under 489 nm excitation,respectively.The Yb^（3＋） concentration dependence on luminescent properties and lifetimes of both the visible and NIR emissions were also investigated.The quenching concentration of Yb^（3＋） ions approached as high as 10 mol.%.The excellent luminescence properties of the LuPO_4：Tb^（3＋）,Yb^（3＋） indicated its potential application in improving the energy conversion efficiency of the silicon based solar cells by converting one blue photon to two NIR ones.展开更多
En fora profunda montaro sin kaas pen-trinda vilaeto de kelkaj familioj.Ali,izolitakaj kvazaǔ forgesita de la mondo,kondukas nurvojstreko,kiu serpentumas suprenis mont-talio.La unika uzebla transportilo estas azeno.S...En fora profunda montaro sin kaas pen-trinda vilaeto de kelkaj familioj.Ali,izolitakaj kvazaǔ forgesita de la mondo,kondukas nurvojstreko,kiu serpentumas suprenis mont-talio.La unika uzebla transportilo estas azeno.Sed la vilaanoj vivas kaj laboras tie,genera-cion post generacio,en paco,harmonio,amike-co kaj helpemo.Ili agas laǔ sia maniero,mal-multe sciante la mondon ekster la vilaeto.展开更多
空间优化模型能够实现多管理目标下的土地利用格局空间优化,为管理者制定保护政策提供参考。该文以黄河三角洲自然保护区为研究区域,基于保护区的多目标管理需求,设计了3种用于协调丹顶鹤生境保护和社区可持续发展的情景模式,并采用土...空间优化模型能够实现多管理目标下的土地利用格局空间优化,为管理者制定保护政策提供参考。该文以黄河三角洲自然保护区为研究区域,基于保护区的多目标管理需求,设计了3种用于协调丹顶鹤生境保护和社区可持续发展的情景模式,并采用土地利用空间优化(land use pattern optimization,LUPO)模型,模拟实现了不同情景模式下的保护区土地利用格局空间优化配置。模拟结果表明:情景A通过将光滩和芦苇滩等转为丹顶鹤喜好的翅碱蓬滩涂和柽柳-翅碱蓬滩涂,实现使丹顶鹤适宜生境面积增加30%的生态效益目标,但年经济收益增幅仅为11%;情景B通过将农田、芦苇滩和光滩等转为年经济效益更高的虾池,使区域年经济效益增长54%,但丹顶鹤适宜生境面积变化较小,生境更为破碎化;情景C通过将光滩等转为翅碱蓬滩涂,将农田等转为虾池,分别使丹顶鹤适宜生境面积增加24%和区域年经济效益增长41.3%,是一种双赢方案。研究结果表明,该模型可用于保护区土地利用格局空间优化,协调物种保护和经济发展之间的平衡关系,但需对模型结构和参数进一步优化设计。展开更多
文摘[Objective]The paper was to study effect of Lupo compound microemulsion( LCW) on Alternaria alternata. [Method]The activity of spore germination and mycelial growth was investigated by filter paper method and mycelial growth rate method,and field test was also conducted to determine the effect of LCW on tobacco plants. [Result]LCW could inhibit spore germination and mycelial growth of A. alternate. The higher concentration led to more severe reduction of sporulation and heavier inhibition against mycelial growth. When LCW was diluted into 200 times,inhibition rate of sporulation reached 91. 23%,and the inhibition rate of mycelial growth reached 93. 50%. Field test also proved that LCW had significant inhibitory effect on tobacco brown spot disease. [Conclusion]The study provided the reference for using botanical pesticide to control A. alternate in fields.
基金Project supported by the National Natural Science Foundation of China(Grant No.11574170)
文摘A comprehensive investigation is carried out to compare the spectroscopic properties, absorption saturation behaviors and lasing properties of a Yb ion in tetragonal LuPO4 and LuVO4 isomorphic crystals. Significant distinctions are revealed in many aspects of the lasing behavior for the Yb ion doped in the two crystal hosts, and Yb：LuPO_4 proves to be superior to Yb：LuVO4 since it enables efficient laser action to be much more easily achieved. With a 0.6 mm thick crystal plate of Yb：LuPO4, an output power of 3.30 W can be generated with an optical–optical conversion efficiency of 50.8%; whereas with a 2 mm long miniature crystal rod, the output power produced can reach 8.35 W with an optical–optical conversion efficiency of 46.7%.
基金supported by the National Natural Science Foundation of China(11404047,11674044,11604037)Chongqing Research Program of Basic Research and Frontier Technology(CSTC2016JCYJA0113,CSTC2016JCYJA0207,CSTC2015JCYJA50005)Research Training Program for Undergraduates of Chongqing University of Posts and Telecommunications(A2015-86,A2016-53)
文摘Tb^（3＋） and Yb^（3＋） codoped LuPO_4 phosphors were prepared by the reverse-strike co-precipitation method.The obtained LuPO_4：Tb^（3＋）,Yb^（3＋） phosphors were characterized by X-ray diffraction（XRD）,photoluminescence（PL） spectra and decay kinetics to understand the near-infrared quantum cutting（QC） phenomena.The XRD results showed that all the phosphors exhibited good crystallinity and had a pure tetragonal phase of LuPO_4.The experimental results showed that the strong green emission around 545 nm from Tb^（3＋）（~5D_4→~7F_5） and near-infrared（NIR） emission at 1003 nm from Yb^（3＋）（~2F_（5/2）→~2F_（7/2）） of LuPO_4：Tb^（3＋）,Yb^（3＋）phosphors were observed under 489 nm excitation,respectively.The Yb^（3＋） concentration dependence on luminescent properties and lifetimes of both the visible and NIR emissions were also investigated.The quenching concentration of Yb^（3＋） ions approached as high as 10 mol.%.The excellent luminescence properties of the LuPO_4：Tb^（3＋）,Yb^（3＋） indicated its potential application in improving the energy conversion efficiency of the silicon based solar cells by converting one blue photon to two NIR ones.
文摘En fora profunda montaro sin kaas pen-trinda vilaeto de kelkaj familioj.Ali,izolitakaj kvazaǔ forgesita de la mondo,kondukas nurvojstreko,kiu serpentumas suprenis mont-talio.La unika uzebla transportilo estas azeno.Sed la vilaanoj vivas kaj laboras tie,genera-cion post generacio,en paco,harmonio,amike-co kaj helpemo.Ili agas laǔ sia maniero,mal-multe sciante la mondon ekster la vilaeto.
文摘空间优化模型能够实现多管理目标下的土地利用格局空间优化,为管理者制定保护政策提供参考。该文以黄河三角洲自然保护区为研究区域,基于保护区的多目标管理需求,设计了3种用于协调丹顶鹤生境保护和社区可持续发展的情景模式,并采用土地利用空间优化(land use pattern optimization,LUPO)模型,模拟实现了不同情景模式下的保护区土地利用格局空间优化配置。模拟结果表明:情景A通过将光滩和芦苇滩等转为丹顶鹤喜好的翅碱蓬滩涂和柽柳-翅碱蓬滩涂,实现使丹顶鹤适宜生境面积增加30%的生态效益目标,但年经济收益增幅仅为11%;情景B通过将农田、芦苇滩和光滩等转为年经济效益更高的虾池,使区域年经济效益增长54%,但丹顶鹤适宜生境面积变化较小,生境更为破碎化;情景C通过将光滩等转为翅碱蓬滩涂,将农田等转为虾池,分别使丹顶鹤适宜生境面积增加24%和区域年经济效益增长41.3%,是一种双赢方案。研究结果表明,该模型可用于保护区土地利用格局空间优化,协调物种保护和经济发展之间的平衡关系,但需对模型结构和参数进一步优化设计。
