In this work the effects of the contents of nickel （5, 7.5, 10 wt%） and copper （0, 1, 2 wt%） and reac- tion temperature （650, 700, 750 ℃） on the catalytic performance of Ni-Cu/Al_2O_3 catalyst in methane dry re...In this work the effects of the contents of nickel （5, 7.5, 10 wt%） and copper （0, 1, 2 wt%） and reac- tion temperature （650, 700, 750 ℃） on the catalytic performance of Ni-Cu/Al_2O_3 catalyst in methane dry reforming were evaluated using Box-Behnken design in order to optimize methane conversion, H_2/CO ratio and the catalyst deactivation. Different catalysts were prepared by co-impregnation method and characterized by XRD, BET, H_2-TPR, FESEM and TG/DTA analyses. The results revealed that copper addi- tion improved the catalyst reducibility. Promoted catalyst with low amounts of Cu gave higher activity and stability with high resistance to coke deposition and agglomeration of active phase especially during the reaction. However catalysts with high amounts of Cu were less active and rather deactivated due to the active sites sintering as well as Ni covering by Cu-enriched phase. The optimal conditions were de- termined by desirability function approach as 10 wt% of Ni, 0.83 wt% of Cu at 750℃. CH_4 conversion of 95.1%, H_2/CO ratio of 1 and deactivation of 1.4% were obtained experimentally under optimum conditions, which were in close agreement with the values oredicted hv the developed model.展开更多
By analyzing tourism image and its relevant concepts,tourism image was stressed as the core factor attracting the attention of tourists,and attention resources have already become precious economic resources.According...By analyzing tourism image and its relevant concepts,tourism image was stressed as the core factor attracting the attention of tourists,and attention resources have already become precious economic resources.According to present tourism image of Qianling Mountain Park,problems and major influencing factors,it was found that its dominant tourism image was misoriented,its advantages were not fully demonstrated;its pillar image was not strong enough,tourism functional items were not properly arranged;secondary image was not given adequate attention.So it is imperative to remold the tourism image of Qianling Mountain Park.Based on the above analysis,reform principles were introduced,and influencing factors of its tourism image were analyzed from the perspectives of characteristics of tourist resources,perception and cognition of tourists,spatial competition of tourist sites,orientation and accessibility of tourist market.Furthermore,strategies for the reform design of tourism image of Qianling Mountain Park were summarized in view of the reform of its dominant image,pillar image and secondary image,and it was also stressed that well-coordinated planning and promotion was needed for popularizing the new image.展开更多
Perovskites as host structures of cations were used in order to generate in situ active and stable catalysts for ethanol steam reforming. For this purpose,La_(1-x)Mg_xAl_(1-y)Ni_yO_3(x = 0.1; y = 0,0.1,0.2,0.3) perovs...Perovskites as host structures of cations were used in order to generate in situ active and stable catalysts for ethanol steam reforming. For this purpose,La_(1-x)Mg_xAl_(1-y)Ni_yO_3(x = 0.1; y = 0,0.1,0.2,0.3) perovskites were synthetized by the citrate method.Ni segregation is evident for a substitution level higher than 0. 2. The segregation of Ni as NiO generated species interacts with different metal-support after the reduction step. The y = 0.1 catalyst presents the highest H_2 yield value about 85% during reaction time,with low mean values of CH_4 and CO selectivities of 3.4% and 11%,respectively and a low carbon formation. The better performance of y = 0.1 catalyst could be attributed to the minor proportion of segregated phases,thus a controlled expulsion of Ni is successfully reached.展开更多
Through the study of the teaching reform design of the course in Architecture Design using the flipped classroom,this paper discussed the effectiveness of the information-based teaching method for students’ learning....Through the study of the teaching reform design of the course in Architecture Design using the flipped classroom,this paper discussed the effectiveness of the information-based teaching method for students’ learning. It integrated the flipped classroom into all aspects of Architectural Design teaching. By using the flipped classroom,it is expected to effectively solve the problems related to the traditional Architectural Design teaching,enhance the students’ participation in the teaching process,create a learning atmosphere for students,enhance the initiative of self-learning,and promote the improvement in the quality of Architectural Design teaching.展开更多
The development of economy and industrialization further accelerates the pace of development of graphic design education.The educational system actively adopted two ways of“going out”and“inviting in”to communicate...The development of economy and industrialization further accelerates the pace of development of graphic design education.The educational system actively adopted two ways of“going out”and“inviting in”to communicate with the western world in graphic design(Zhang,2009).Chinese design began to re-examine its balance between globalization and localization after rapid absorption and international experience digestion.As for the negative influence,it led to the risk of developing short-sightedness in design education.Faced with unprecedented challenges,the graphic design industry was continually expanding its functions.The development of Chinese design cannot entirely rely on its own.There was no doubt that graphic design was indeed facing significant obstacles.The suggestions from the American Institute of Graphic Arts(AIGA)are set very high to achieve;the objectives will be excellent if academia can follow.A study aims to understand the overall curriculum and course design and how best to modify the general curriculum and course design to allow for industry practices changes and keep a close eye on the Chinese market's changing needs for design should be carried out.展开更多
Based on the practical experiences of Guangdong carbon emissions trading pilot, the key issues such as cap setting, allowance alloca- tion, system defects, regulatory integration and MRV mechanisms were analyzed in th...Based on the practical experiences of Guangdong carbon emissions trading pilot, the key issues such as cap setting, allowance alloca- tion, system defects, regulatory integration and MRV mechanisms were analyzed in this paper from the localization perspective. A number of solu- tions and policy recommendations were also proposed in this study in order to solve these barriers.展开更多
文摘In this work the effects of the contents of nickel （5, 7.5, 10 wt%） and copper （0, 1, 2 wt%） and reac- tion temperature （650, 700, 750 ℃） on the catalytic performance of Ni-Cu/Al_2O_3 catalyst in methane dry reforming were evaluated using Box-Behnken design in order to optimize methane conversion, H_2/CO ratio and the catalyst deactivation. Different catalysts were prepared by co-impregnation method and characterized by XRD, BET, H_2-TPR, FESEM and TG/DTA analyses. The results revealed that copper addi- tion improved the catalyst reducibility. Promoted catalyst with low amounts of Cu gave higher activity and stability with high resistance to coke deposition and agglomeration of active phase especially during the reaction. However catalysts with high amounts of Cu were less active and rather deactivated due to the active sites sintering as well as Ni covering by Cu-enriched phase. The optimal conditions were de- termined by desirability function approach as 10 wt% of Ni, 0.83 wt% of Cu at 750℃. CH_4 conversion of 95.1%, H_2/CO ratio of 1 and deactivation of 1.4% were obtained experimentally under optimum conditions, which were in close agreement with the values oredicted hv the developed model.
文摘By analyzing tourism image and its relevant concepts,tourism image was stressed as the core factor attracting the attention of tourists,and attention resources have already become precious economic resources.According to present tourism image of Qianling Mountain Park,problems and major influencing factors,it was found that its dominant tourism image was misoriented,its advantages were not fully demonstrated;its pillar image was not strong enough,tourism functional items were not properly arranged;secondary image was not given adequate attention.So it is imperative to remold the tourism image of Qianling Mountain Park.Based on the above analysis,reform principles were introduced,and influencing factors of its tourism image were analyzed from the perspectives of characteristics of tourist resources,perception and cognition of tourists,spatial competition of tourist sites,orientation and accessibility of tourist market.Furthermore,strategies for the reform design of tourism image of Qianling Mountain Park were summarized in view of the reform of its dominant image,pillar image and secondary image,and it was also stressed that well-coordinated planning and promotion was needed for popularizing the new image.
文摘Perovskites as host structures of cations were used in order to generate in situ active and stable catalysts for ethanol steam reforming. For this purpose,La_(1-x)Mg_xAl_(1-y)Ni_yO_3(x = 0.1; y = 0,0.1,0.2,0.3) perovskites were synthetized by the citrate method.Ni segregation is evident for a substitution level higher than 0. 2. The segregation of Ni as NiO generated species interacts with different metal-support after the reduction step. The y = 0.1 catalyst presents the highest H_2 yield value about 85% during reaction time,with low mean values of CH_4 and CO selectivities of 3.4% and 11%,respectively and a low carbon formation. The better performance of y = 0.1 catalyst could be attributed to the minor proportion of segregated phases,thus a controlled expulsion of Ni is successfully reached.
文摘Through the study of the teaching reform design of the course in Architecture Design using the flipped classroom,this paper discussed the effectiveness of the information-based teaching method for students’ learning. It integrated the flipped classroom into all aspects of Architectural Design teaching. By using the flipped classroom,it is expected to effectively solve the problems related to the traditional Architectural Design teaching,enhance the students’ participation in the teaching process,create a learning atmosphere for students,enhance the initiative of self-learning,and promote the improvement in the quality of Architectural Design teaching.
文摘The development of economy and industrialization further accelerates the pace of development of graphic design education.The educational system actively adopted two ways of“going out”and“inviting in”to communicate with the western world in graphic design(Zhang,2009).Chinese design began to re-examine its balance between globalization and localization after rapid absorption and international experience digestion.As for the negative influence,it led to the risk of developing short-sightedness in design education.Faced with unprecedented challenges,the graphic design industry was continually expanding its functions.The development of Chinese design cannot entirely rely on its own.There was no doubt that graphic design was indeed facing significant obstacles.The suggestions from the American Institute of Graphic Arts(AIGA)are set very high to achieve;the objectives will be excellent if academia can follow.A study aims to understand the overall curriculum and course design and how best to modify the general curriculum and course design to allow for industry practices changes and keep a close eye on the Chinese market's changing needs for design should be carried out.
基金Supported by the Guangdong Province Social Science Fund(NoGD11CYJ11)the Low Carbon Special Project of Guangdong Province in 2012(No.2012-044)
文摘Based on the practical experiences of Guangdong carbon emissions trading pilot, the key issues such as cap setting, allowance alloca- tion, system defects, regulatory integration and MRV mechanisms were analyzed in this paper from the localization perspective. A number of solu- tions and policy recommendations were also proposed in this study in order to solve these barriers.
