[ Objective ] To figure out the optimal setting height of gyplure trappers for controlling such pests as Spodoptera litura, Helicoverpa assuha, Helicoverpa armigera Hubner and Agrotis ypsilon that endanger tobacco lea...[ Objective ] To figure out the optimal setting height of gyplure trappers for controlling such pests as Spodoptera litura, Helicoverpa assuha, Helicoverpa armigera Hubner and Agrotis ypsilon that endanger tobacco leaves, and screen trappers suitable for the tobacco production. [ Method] In the growth season of to- bacco plants, moth trapper, new moth trapper lure/insect inlet are set up at four different heights （70, 110, 150 and 190 cm vertically from soil surface in the field）, to investigate the quantity of trapped moths. [ Result ] For both trappers, the height of trapping the most moths is 70 - 150 cm, so the initial height of lure/ insect inlet should be 120 cm, considering the 1-m mature tobacco plant height and the 20-cm distance between lure/insect inlet and crop canopy. [ Conclusion] Mother trapper is cheaper, and the new moth trapper is convenient and requires less management cost. The former is favorable for trapping S. litura, and the latter for H. assulta, H. armigera Hubner, and both of them are suitable for trapping A. ypsilon. In tobacco producing regions of Yunnan, population bases of the four noctuids endangering tobacco leaves show the sequence of S. litura 〉 A. ypsilon 〉 H. armigera Hubner 〉 H. assuha. But in tobacco production, H. armigera Hubner, H. assuha, and A. ypsilon cause the most serious damages, so the four noctuids must be controlled. Key words Tobacco noctuid; Sex lure; Trapper; Setting height展开更多
Modifiers have a broad array of influences on extraction with liquids in standard state, supercritical fluid extraction (SFE), trapping by SFE and supercritical fluid chromatography (SFC). They can significantly chang...Modifiers have a broad array of influences on extraction with liquids in standard state, supercritical fluid extraction (SFE), trapping by SFE and supercritical fluid chromatography (SFC). They can significantly change the qualitative and quantitative results. Quantitative and qualitative results can be influenced by different extractants and modifiers in different ways as it was shown by Brondz et al. at 2007 in “The real nature of the indole alkaloids in Cortinarius infractus: Evaluation of artifact formation through solvent extraction method development”, J. Chromatography A, 1148, 1-7. The choice of correct extractant, modifier, and trapper to the bulk mobile phase for supercritical fluids (SFs) or for liquids in subcritical or in the liquids in standard state is a challenge in any extraction procedure. This is the second paper in a sequence that describes the influence of extractants and modifiers on the performance of SFs and results of extraction with liquids in standard state and SFE. Here, attention is given to possible mistakes in qualitative and quantitative results by poor understanding of the influence of extractants, modifiers, and trappers on extraction and trapping process by a careless choice of extractant, modifier, and trapper for extraction with liquids in standard state and SFE. The SF chosen for discussion in the paper is CO2. However, similar effects can be observed with use of other SFs and fluids in subcritical and standard states. In this paper, the discussion of lipids, fatty and carboxylic acids have been chosen as target analytes for extraction, trapping and analysis. Some examples from extraction with liquids in the standard state and trapping in the supercritical state (collection) have been furnished with the wrong extractant, modifier, or trapper which is presented for illustration of inappropriate choice of extractants, modifiers, and trappers.展开更多
High photogenerated carrier recombination rate and weak spectral response are the two main factors restricting photocatalytic activities of photocatalysts.In this work,a novel Ag/Bi_(24)O_(31)Cl_(10)heterojunction has...High photogenerated carrier recombination rate and weak spectral response are the two main factors restricting photocatalytic activities of photocatalysts.In this work,a novel Ag/Bi_(24)O_(31)Cl_(10)heterojunction has been developed by the in-situ photoreduction technique to address the preceding issues.Physico-chemical properties of as-synthesized 0.7 wt%Ag/Bi_(24)O_(31)Cl_(10)photocatalysts were investigated in detail.The Ag clusters can be seen as surface plasmon polaritons to light absorption capacity and photothermal effect,which was demonstrated via Raman and UV-Vis diffuse reflectance spectra(UV-Vis DRS).Den-sity functional theory(DFT)calculations show that the additional unoccupied crystal orbital by the silver(Ag)will accelerate the charge separation where some of the excited electrons to the conduction band of Bi_(24)O_(31)Cl_(10)will drift to these orbitals which in turn prevent charge recombination.Therefore,Ag metal cluster-decorated Bi_(24)O_(31)Cl_(10)photocatalysts can be identified as electron trappers to boost the spatial separation of the photogenerated carrier,and finally,the CH 4 generation rate and the rhodamine b(RhB)degraded efficiency of Ag/Bi_(24)O_(31)Cl_(10)photocatalysts are enhanced about 1.54 and 5.20 times,respectively.The Ag/Bi_(24)O_(31)Cl_(10)composite photocatalyst retained high photocatalytic activities after four cycles indi-cating the stability and repeatability of the Ag/Bi_(24)O_(31)Cl_(10)composite.This work aims to provide new insight into modifying ideal semiconductor materials for high photocatalytic activity.展开更多
基金Sponsored by Yunnan Provincial Tobacco Monopoly Administration(Company)Scientific and Technological Program(2012YN04,2010YN09)State Tobacco Monopoly Bureau(110200902065)
文摘[ Objective ] To figure out the optimal setting height of gyplure trappers for controlling such pests as Spodoptera litura, Helicoverpa assuha, Helicoverpa armigera Hubner and Agrotis ypsilon that endanger tobacco leaves, and screen trappers suitable for the tobacco production. [ Method] In the growth season of to- bacco plants, moth trapper, new moth trapper lure/insect inlet are set up at four different heights （70, 110, 150 and 190 cm vertically from soil surface in the field）, to investigate the quantity of trapped moths. [ Result ] For both trappers, the height of trapping the most moths is 70 - 150 cm, so the initial height of lure/ insect inlet should be 120 cm, considering the 1-m mature tobacco plant height and the 20-cm distance between lure/insect inlet and crop canopy. [ Conclusion] Mother trapper is cheaper, and the new moth trapper is convenient and requires less management cost. The former is favorable for trapping S. litura, and the latter for H. assulta, H. armigera Hubner, and both of them are suitable for trapping A. ypsilon. In tobacco producing regions of Yunnan, population bases of the four noctuids endangering tobacco leaves show the sequence of S. litura 〉 A. ypsilon 〉 H. armigera Hubner 〉 H. assuha. But in tobacco production, H. armigera Hubner, H. assuha, and A. ypsilon cause the most serious damages, so the four noctuids must be controlled. Key words Tobacco noctuid; Sex lure; Trapper; Setting height
文摘Modifiers have a broad array of influences on extraction with liquids in standard state, supercritical fluid extraction (SFE), trapping by SFE and supercritical fluid chromatography (SFC). They can significantly change the qualitative and quantitative results. Quantitative and qualitative results can be influenced by different extractants and modifiers in different ways as it was shown by Brondz et al. at 2007 in “The real nature of the indole alkaloids in Cortinarius infractus: Evaluation of artifact formation through solvent extraction method development”, J. Chromatography A, 1148, 1-7. The choice of correct extractant, modifier, and trapper to the bulk mobile phase for supercritical fluids (SFs) or for liquids in subcritical or in the liquids in standard state is a challenge in any extraction procedure. This is the second paper in a sequence that describes the influence of extractants and modifiers on the performance of SFs and results of extraction with liquids in standard state and SFE. Here, attention is given to possible mistakes in qualitative and quantitative results by poor understanding of the influence of extractants, modifiers, and trappers on extraction and trapping process by a careless choice of extractant, modifier, and trapper for extraction with liquids in standard state and SFE. The SF chosen for discussion in the paper is CO2. However, similar effects can be observed with use of other SFs and fluids in subcritical and standard states. In this paper, the discussion of lipids, fatty and carboxylic acids have been chosen as target analytes for extraction, trapping and analysis. Some examples from extraction with liquids in the standard state and trapping in the supercritical state (collection) have been furnished with the wrong extractant, modifier, or trapper which is presented for illustration of inappropriate choice of extractants, modifiers, and trappers.
基金supported by the National Natural Science Foundation of China(No.12274361)Natural Science Foundation of Jiangsu Province(No.BK20211361)+1 种基金Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX21_3145)school-level research projects of Yancheng Institute of Technology(Nos.xjr2019028 and xjr2019059).
文摘High photogenerated carrier recombination rate and weak spectral response are the two main factors restricting photocatalytic activities of photocatalysts.In this work,a novel Ag/Bi_(24)O_(31)Cl_(10)heterojunction has been developed by the in-situ photoreduction technique to address the preceding issues.Physico-chemical properties of as-synthesized 0.7 wt%Ag/Bi_(24)O_(31)Cl_(10)photocatalysts were investigated in detail.The Ag clusters can be seen as surface plasmon polaritons to light absorption capacity and photothermal effect,which was demonstrated via Raman and UV-Vis diffuse reflectance spectra(UV-Vis DRS).Den-sity functional theory(DFT)calculations show that the additional unoccupied crystal orbital by the silver(Ag)will accelerate the charge separation where some of the excited electrons to the conduction band of Bi_(24)O_(31)Cl_(10)will drift to these orbitals which in turn prevent charge recombination.Therefore,Ag metal cluster-decorated Bi_(24)O_(31)Cl_(10)photocatalysts can be identified as electron trappers to boost the spatial separation of the photogenerated carrier,and finally,the CH 4 generation rate and the rhodamine b(RhB)degraded efficiency of Ag/Bi_(24)O_(31)Cl_(10)photocatalysts are enhanced about 1.54 and 5.20 times,respectively.The Ag/Bi_(24)O_(31)Cl_(10)composite photocatalyst retained high photocatalytic activities after four cycles indi-cating the stability and repeatability of the Ag/Bi_(24)O_(31)Cl_(10)composite.This work aims to provide new insight into modifying ideal semiconductor materials for high photocatalytic activity.
