以I2为修饰剂,采用等体积浸渍法成功改性制备了I-Ag/ZSM-5催化剂,考察了不同Ag负载量对催化剂物化性质和MTO反应催化性能的影响。采用XRD、NH3-TPD、XRF等手段对不同Ag负载量I-Ag/ZSM-5催化剂微观结构、表面酸性质及反应前后元素组成等...以I2为修饰剂,采用等体积浸渍法成功改性制备了I-Ag/ZSM-5催化剂,考察了不同Ag负载量对催化剂物化性质和MTO反应催化性能的影响。采用XRD、NH3-TPD、XRF等手段对不同Ag负载量I-Ag/ZSM-5催化剂微观结构、表面酸性质及反应前后元素组成等进行分析表征。结果表明,I负载量9%时,不同Ag负载量对I-Ag/ZSM-5催化剂物化性质和MTO反应催化性能影响较大;Ag负载量9%时,Ag与I形成适宜化学吸附,提高了催化剂稳定性,产生了部分较弱中强酸;在常压、反应温度330℃、氮气流速20 m L/min、进料空速为2.4 h-1反应条件下,9%I-9%Ag/ZSM-5催化剂表现出良好催化性能,甲醇转化率和低碳烯烃选择性分别达90.13%和87.44%。展开更多
By using a farm's data in Yantai City and the theory of Cost-Volume-Profit analysis and the financial management methods,this paper construct a multi-factor analysis model for improving profit management using Exc...By using a farm's data in Yantai City and the theory of Cost-Volume-Profit analysis and the financial management methods,this paper construct a multi-factor analysis model for improving profit management using Excel 2007 in Shellfish farming projects and describes the procedures to construct a multi-factor analysis model.The model can quickly calculate the profit,improve the level of profit management,find out the breakeven point and enhance the decision-making efficiency of businesses etc.It is also a thought of the application to offer suggestions for government decisions and economic decisions for corporations as a simple analysis tool.While effort has been exerted to construct a four-variable model,some equally important variables may not be discussed sufficiently due to limitation of the paper's space and the authors'knowledge.All variables can be listed in EXCEL 2007 and can be associated in a logical way to manage the profit of shellfish farming projects more efficiently and more practically.展开更多
Lookup table is widely used in automotive industry for the design of engine control units(ECU).Together with a proportional-integral controller,a feed-forward and feedback control scheme is often adopted for automotiv...Lookup table is widely used in automotive industry for the design of engine control units(ECU).Together with a proportional-integral controller,a feed-forward and feedback control scheme is often adopted for automotive engine management system(EMS).Usually,an ECU has a structure of multi-input and single-output(MISO).Therefore,if there are multiple objectives proposed in EMS,there would be corresponding numbers of ECUs that need to be designed.In this situation,huge efforts and time were spent on calibration.In this work,a multi-input and multi-out(MIMO) approach based on model predictive control(MPC) was presented for the automatic cruise system of automotive engine.The results show that the tracking of engine speed command and the regulation of air/fuel ratio(AFR) can be achieved simultaneously under the new scheme.The mean absolute error(MAE) for engine speed control is 0.037,and the MAE for air fuel ratio is 0.069.展开更多
文摘以I2为修饰剂,采用等体积浸渍法成功改性制备了I-Ag/ZSM-5催化剂,考察了不同Ag负载量对催化剂物化性质和MTO反应催化性能的影响。采用XRD、NH3-TPD、XRF等手段对不同Ag负载量I-Ag/ZSM-5催化剂微观结构、表面酸性质及反应前后元素组成等进行分析表征。结果表明,I负载量9%时,不同Ag负载量对I-Ag/ZSM-5催化剂物化性质和MTO反应催化性能影响较大;Ag负载量9%时,Ag与I形成适宜化学吸附,提高了催化剂稳定性,产生了部分较弱中强酸;在常压、反应温度330℃、氮气流速20 m L/min、进料空速为2.4 h-1反应条件下,9%I-9%Ag/ZSM-5催化剂表现出良好催化性能,甲醇转化率和低碳烯烃选择性分别达90.13%和87.44%。
文摘By using a farm's data in Yantai City and the theory of Cost-Volume-Profit analysis and the financial management methods,this paper construct a multi-factor analysis model for improving profit management using Excel 2007 in Shellfish farming projects and describes the procedures to construct a multi-factor analysis model.The model can quickly calculate the profit,improve the level of profit management,find out the breakeven point and enhance the decision-making efficiency of businesses etc.It is also a thought of the application to offer suggestions for government decisions and economic decisions for corporations as a simple analysis tool.While effort has been exerted to construct a four-variable model,some equally important variables may not be discussed sufficiently due to limitation of the paper's space and the authors'knowledge.All variables can be listed in EXCEL 2007 and can be associated in a logical way to manage the profit of shellfish farming projects more efficiently and more practically.
基金Project supported by the Centre for Smart Grid and Information Convergence(CeSGIC)at Xi’an Jiaotong-Liverpool University,China
文摘Lookup table is widely used in automotive industry for the design of engine control units(ECU).Together with a proportional-integral controller,a feed-forward and feedback control scheme is often adopted for automotive engine management system(EMS).Usually,an ECU has a structure of multi-input and single-output(MISO).Therefore,if there are multiple objectives proposed in EMS,there would be corresponding numbers of ECUs that need to be designed.In this situation,huge efforts and time were spent on calibration.In this work,a multi-input and multi-out(MIMO) approach based on model predictive control(MPC) was presented for the automatic cruise system of automotive engine.The results show that the tracking of engine speed command and the regulation of air/fuel ratio(AFR) can be achieved simultaneously under the new scheme.The mean absolute error(MAE) for engine speed control is 0.037,and the MAE for air fuel ratio is 0.069.
