An experimental investigation on transmission welding of polycarbonate( PC) filled with and without black carbon has been carried out. Furthermore,correlations between the laser transmission welding parameters and out...An experimental investigation on transmission welding of polycarbonate( PC) filled with and without black carbon has been carried out. Furthermore,correlations between the laser transmission welding parameters and output variables are developed by applying response surface methodology( RSM). The process parameters of the model include laser power,welding speed,clamping force and cooling time,the output parameters of the model include maximum tensile load. The design expert v8. 05 b establishes the design matrix and obtains the regression equation,in order to analyze the influence of the process parameters on the tensile load. The analysis-of-variance( ANOVA) method is used to check the models' adequacy.Results reveal that the measured and calculated results are in good agreement.展开更多
Studies have shown that global warming over the past six decades can weaken the tropical Pacific Walker circulation and maintain the positive phase of the Interdecadal Pacific Oscillation （IPO）. Based on observation...Studies have shown that global warming over the past six decades can weaken the tropical Pacific Walker circulation and maintain the positive phase of the Interdecadal Pacific Oscillation （IPO）. Based on observations and model simulations, another aftereffect of global warming on IPO is found. After removing linear trends （global warming signals） from observations, however, the tropical Pacific climate still exhibited some obvious differences between two IPO negative phases. The boreal winter （DJF） equatorial central-eastern Pacific sea surface temperature （SST） was colder during the 1999-2014 period （P2） than that during 1961-1976 （P 1）. This difference may have been a result of global warming nonlinear modulation of precipitation; i.e., in the climatological rainy region, the core area of the tropical Indo-westem Pacific warm pool receives more precipitation through the ＂wet-get-wetter＂ mechanism. Positive precipitation anomalies in the warm pool during P2 are much stronger than those during P1, even after subtracting the linear trend. Corresponding to the differences of precipitation, the Pacific Walker circulation is stronger in P2 than in P 1. Consequent easterly winds over the equatorial Pacific led to a colder equatorial eastern--central Pacific during P2. Therefore, tropical Pacific climate differences between the two negative IPO phases are aftereffects of global warming. These aftereffects are supported by the results of coupled climate model experiments, with and without global warming.展开更多
基金supported by the National Natural Science Foundation of China(No.51475315)Innovative Project on the Integration of Industry,Education and Research of Jiangsu Province(No.BY2014059-10)Ningbo Major R&D Projects(2015B11036)
文摘An experimental investigation on transmission welding of polycarbonate( PC) filled with and without black carbon has been carried out. Furthermore,correlations between the laser transmission welding parameters and output variables are developed by applying response surface methodology( RSM). The process parameters of the model include laser power,welding speed,clamping force and cooling time,the output parameters of the model include maximum tensile load. The design expert v8. 05 b establishes the design matrix and obtains the regression equation,in order to analyze the influence of the process parameters on the tensile load. The analysis-of-variance( ANOVA) method is used to check the models' adequacy.Results reveal that the measured and calculated results are in good agreement.
基金Supported by the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDA11010102)the National Natural Science Foundation of China(Nos.41490643,41606018)+1 种基金the Funds for Creative Research Groups of China(No.41421005)the Shandong Joint Fund for Marine Science Research Centers(No.U1406401)
文摘Studies have shown that global warming over the past six decades can weaken the tropical Pacific Walker circulation and maintain the positive phase of the Interdecadal Pacific Oscillation （IPO）. Based on observations and model simulations, another aftereffect of global warming on IPO is found. After removing linear trends （global warming signals） from observations, however, the tropical Pacific climate still exhibited some obvious differences between two IPO negative phases. The boreal winter （DJF） equatorial central-eastern Pacific sea surface temperature （SST） was colder during the 1999-2014 period （P2） than that during 1961-1976 （P 1）. This difference may have been a result of global warming nonlinear modulation of precipitation; i.e., in the climatological rainy region, the core area of the tropical Indo-westem Pacific warm pool receives more precipitation through the ＂wet-get-wetter＂ mechanism. Positive precipitation anomalies in the warm pool during P2 are much stronger than those during P1, even after subtracting the linear trend. Corresponding to the differences of precipitation, the Pacific Walker circulation is stronger in P2 than in P 1. Consequent easterly winds over the equatorial Pacific led to a colder equatorial eastern--central Pacific during P2. Therefore, tropical Pacific climate differences between the two negative IPO phases are aftereffects of global warming. These aftereffects are supported by the results of coupled climate model experiments, with and without global warming.
