In this paper, the isogeometric analysis (IGA) is employed to develop an acoustic radiation model for a double plate-acoustic cavity coupling system, with a focus on analyzing the sound transmission loss (STL). The fu...In this paper, the isogeometric analysis (IGA) is employed to develop an acoustic radiation model for a double plate-acoustic cavity coupling system, with a focus on analyzing the sound transmission loss (STL). The functionally graded (FG) plate exhibits a different material properties in-plane, and the power-law rule is adopted as the governing principle for material mixing. To validate the harmonic response and demonstrate the accuracy and convergence of the isogeometric modeling, ANASYS is utilized to compare with numerical examples. A plane wave serves as the acoustic excitation, and the Rayleigh integral is applied to discretize the radiated plate. The STL results are compared with the literature, confirming the reliability of the coupling system. Finally, the investigation is conducted to study impact of cavity depth and power-law parameter on the STL.展开更多
[ Objective] This study aimed to screen and preliminarily identify LactobaciUus strain CW3. [ Method] Oxford cup double-plate method was used for preliminary screening of broad-spectrum bacteriacin-producing Lactobaci...[ Objective] This study aimed to screen and preliminarily identify LactobaciUus strain CW3. [ Method] Oxford cup double-plate method was used for preliminary screening of broad-spectrum bacteriacin-producing LactobaciUus strain; after eliminating the interference of organic acid and hydrogen peroxide, antibac- terial substances containing protein properties produced by the screened strain were detected; finally, the obtained strain was identified. [ Result] After elimination of interference factors such as organic acid and hydrogen peroxide, the fermentation supernatant of strain CW3 could stil｜ inhibit the growth of indicator strains; the antibacterial activity of fermentation broth was significantly reduced after treatment with trypsase and pepsase, which indicated that the produced antibacterial sub- stances were bacteriocins. Results of physiological and biochemical identification showed that strain CW3 belonged to Lactobacillus plantarum. [ Conclusion] CW3 is a broad-spectrum bacteriocin-producing LactobaciUus plantarum strain.展开更多
文摘In this paper, the isogeometric analysis (IGA) is employed to develop an acoustic radiation model for a double plate-acoustic cavity coupling system, with a focus on analyzing the sound transmission loss (STL). The functionally graded (FG) plate exhibits a different material properties in-plane, and the power-law rule is adopted as the governing principle for material mixing. To validate the harmonic response and demonstrate the accuracy and convergence of the isogeometric modeling, ANASYS is utilized to compare with numerical examples. A plane wave serves as the acoustic excitation, and the Rayleigh integral is applied to discretize the radiated plate. The STL results are compared with the literature, confirming the reliability of the coupling system. Finally, the investigation is conducted to study impact of cavity depth and power-law parameter on the STL.
基金Supported by National Natural Science Foundation of China(41101244)Project of Basic and Advanced Research of Henan Province(122300410161)Natural Science Research Project of the Education Department of Henan Province(2010B180029)
文摘[ Objective] This study aimed to screen and preliminarily identify LactobaciUus strain CW3. [ Method] Oxford cup double-plate method was used for preliminary screening of broad-spectrum bacteriacin-producing LactobaciUus strain; after eliminating the interference of organic acid and hydrogen peroxide, antibac- terial substances containing protein properties produced by the screened strain were detected; finally, the obtained strain was identified. [ Result] After elimination of interference factors such as organic acid and hydrogen peroxide, the fermentation supernatant of strain CW3 could stil｜ inhibit the growth of indicator strains; the antibacterial activity of fermentation broth was significantly reduced after treatment with trypsase and pepsase, which indicated that the produced antibacterial sub- stances were bacteriocins. Results of physiological and biochemical identification showed that strain CW3 belonged to Lactobacillus plantarum. [ Conclusion] CW3 is a broad-spectrum bacteriocin-producing LactobaciUus plantarum strain.
