Based on the research on corrosion-resistance of titanium in various media and a great deal of tests, a newchemical cleaning process for titanium-made equipment was developed and applied to titanium-made heat exchange...Based on the research on corrosion-resistance of titanium in various media and a great deal of tests, a newchemical cleaning process for titanium-made equipment was developed and applied to titanium-made heat exchangersof a homemade multi-stage flash distiller for sea-water desalination in Tianjin Dagang Power Plant. Scale in the tubeswas removed completely as inspected by the experts. Testing results of hydrogen content and metallographic structureof titanium tubes showed that the cleaning was successful without any damages to the equipment.[展开更多
Here we propose a hybrid polymer-LN waveguide for achieving phase-matched second-harmonic generation(SHG).From the aspect of super-mode theory,the geometric parameters of the hybrid semi-nonlinear waveguide were optim...Here we propose a hybrid polymer-LN waveguide for achieving phase-matched second-harmonic generation(SHG).From the aspect of super-mode theory,the geometric parameters of the hybrid semi-nonlinear waveguide were optimized to utilize both symmetric(even)and antisymmetric(odd)modes of the pump and SHG waves so as to facilitate phase matching with large modal overlap.Phase matching between a fundamental even(TE_(00)-like)mode at 1320 nm and a fundamental odd(TE_(01)-like)mode at 660 nm was found with a calculated modal overlap integral of 0.299,while utilizing the largest nonlinear coefficient d_(33),and achieving an efficient calculated normalized conversion efficiency of 148%W^(-1)·cm^(-2).Considering the fabrication feasibility of such hybrid waveguide with features including etchless,large dimension,and low structural sensitivity,we believe our findings would provide a useful reference for future on-chip efficient nonlinear conversion devices.展开更多
文摘Based on the research on corrosion-resistance of titanium in various media and a great deal of tests, a newchemical cleaning process for titanium-made equipment was developed and applied to titanium-made heat exchangersof a homemade multi-stage flash distiller for sea-water desalination in Tianjin Dagang Power Plant. Scale in the tubeswas removed completely as inspected by the experts. Testing results of hydrogen content and metallographic structureof titanium tubes showed that the cleaning was successful without any damages to the equipment.[
基金Project supported by the National Natural Science Foundation of China(Grant Nos.91850107 and 12174116)the National Key Research and Development Program of China(Grant No.2018YFA0306200)+3 种基金Guangdong Innovative and Entrepreneurial Research Team Program(Grant No.2016ZT06C594)the Key Program of Guangzhou Scientific Research Special Project(Grant No.201904020013)the Science and Technology Project of Guangdong Province,China(Grant No.2020B010190001)the Fundamental Research Funds for the Central Universities。
文摘Here we propose a hybrid polymer-LN waveguide for achieving phase-matched second-harmonic generation(SHG).From the aspect of super-mode theory,the geometric parameters of the hybrid semi-nonlinear waveguide were optimized to utilize both symmetric(even)and antisymmetric(odd)modes of the pump and SHG waves so as to facilitate phase matching with large modal overlap.Phase matching between a fundamental even(TE_(00)-like)mode at 1320 nm and a fundamental odd(TE_(01)-like)mode at 660 nm was found with a calculated modal overlap integral of 0.299,while utilizing the largest nonlinear coefficient d_(33),and achieving an efficient calculated normalized conversion efficiency of 148%W^(-1)·cm^(-2).Considering the fabrication feasibility of such hybrid waveguide with features including etchless,large dimension,and low structural sensitivity,we believe our findings would provide a useful reference for future on-chip efficient nonlinear conversion devices.
