近年来,布里渊频域分析技术(Brillouin Optical Frequency Domain Analyzer, BOFDA)已被成功地应用到岩土体、地质及建(构)筑物结构的温度和应变监测中。介绍了BOFDA技术的原理,设计了管道模型的环向收敛变形模型试验,并将BOFDA技术成...近年来,布里渊频域分析技术(Brillouin Optical Frequency Domain Analyzer, BOFDA)已被成功地应用到岩土体、地质及建(构)筑物结构的温度和应变监测中。介绍了BOFDA技术的原理,设计了管道模型的环向收敛变形模型试验,并将BOFDA技术成功应用到管道的环向收敛变形监测中。通过设计不同的感测光缆的布设工艺,对比不同的传感元件和布设工艺之间的性能差异。实验获取了不同围压下管道的收敛变形值以及管道的环向应变,建立了同比例Finite Element Modeling(FEM)模型,模拟各实验情况下管道的各项性能指标,并将数值计算结果与实测结果相对比。对比分析表明,基于BOFDA技术的分布式光纤传感器测得管道外表面为压应变,内表面为拉应变,其监测数值及规律与FEM模拟分析结果表现一致。据此得出:BOFDA技术可有效地应用于管道的环向收敛变形监测,可定性的定位管道应力集中位置及定量的获取应力应变数值。实际工程中,该技术可在管道及隧道的受力变形监测领域推广应用。展开更多
Thienoacenes is one of most important groups of semiconducting materials due to the high stability and superior mobility.However,there are scarce studies on the emission properties of thienoacenes to date.Herein,we sy...Thienoacenes is one of most important groups of semiconducting materials due to the high stability and superior mobility.However,there are scarce studies on the emission properties of thienoacenes to date.Herein,we synthesized fluorinated and chlorinated dibenzo[d,d’]thieno[3,2-b;4,5-b’]dithiophenes(DBTDTs)derivatives F6-DBTDT and Cl6-DBTDT by sulfoxide cyclization,significantly lowering the energy levels relative to the parent compound DBTDT.According to single crystal structure analysis,F6-DBTDT molecules adopt one-dimensional slipped stacking with closeπ-πinteractions of 3.43Å(1Å=0.1 nm),which is different from the parent compound DBTDT with herringbone stacking motif.Interestingly,the halogenated DBTDT derivatives exhibit enhanced emission properties both in solution and in the solid state,opening up possiblities to improve photoluminescence of thienoacences by halogenation.展开更多
文摘近年来,布里渊频域分析技术(Brillouin Optical Frequency Domain Analyzer, BOFDA)已被成功地应用到岩土体、地质及建(构)筑物结构的温度和应变监测中。介绍了BOFDA技术的原理,设计了管道模型的环向收敛变形模型试验,并将BOFDA技术成功应用到管道的环向收敛变形监测中。通过设计不同的感测光缆的布设工艺,对比不同的传感元件和布设工艺之间的性能差异。实验获取了不同围压下管道的收敛变形值以及管道的环向应变,建立了同比例Finite Element Modeling(FEM)模型,模拟各实验情况下管道的各项性能指标,并将数值计算结果与实测结果相对比。对比分析表明,基于BOFDA技术的分布式光纤传感器测得管道外表面为压应变,内表面为拉应变,其监测数值及规律与FEM模拟分析结果表现一致。据此得出:BOFDA技术可有效地应用于管道的环向收敛变形监测,可定性的定位管道应力集中位置及定量的获取应力应变数值。实际工程中,该技术可在管道及隧道的受力变形监测领域推广应用。
基金supported by the Fundamental Research Funds for the Central Universities,China(No.buctrc202103)the National Natural Science Foundation of China(Nos.21975263,22171019,52373170)+2 种基金the Project of the China Petroleum and Chemical Corporation(No.222131)the Open Project Programs of Wuhan National Laboratory for Optoelectronics,China(No.2021WNLOKF005)the Project of the State Key Laboratory of Fine Chemicals(Dalian University of Technology),China(No.KF2201).
文摘Thienoacenes is one of most important groups of semiconducting materials due to the high stability and superior mobility.However,there are scarce studies on the emission properties of thienoacenes to date.Herein,we synthesized fluorinated and chlorinated dibenzo[d,d’]thieno[3,2-b;4,5-b’]dithiophenes(DBTDTs)derivatives F6-DBTDT and Cl6-DBTDT by sulfoxide cyclization,significantly lowering the energy levels relative to the parent compound DBTDT.According to single crystal structure analysis,F6-DBTDT molecules adopt one-dimensional slipped stacking with closeπ-πinteractions of 3.43Å(1Å=0.1 nm),which is different from the parent compound DBTDT with herringbone stacking motif.Interestingly,the halogenated DBTDT derivatives exhibit enhanced emission properties both in solution and in the solid state,opening up possiblities to improve photoluminescence of thienoacences by halogenation.
