Trace amounts of noble metal-doped Ni/Mg（AI）O catalysts were pre- pared starting from Mg-Al hydrotalcites （HTs） and tested in daily start-up and shut-down （DSS） operation of steam reforming （SR） of methane or ...Trace amounts of noble metal-doped Ni/Mg（AI）O catalysts were pre- pared starting from Mg-Al hydrotalcites （HTs） and tested in daily start-up and shut-down （DSS） operation of steam reforming （SR） of methane or partial oxidation （PO） of propane. Although Ni/Mg（Al）O catalysts prepared from Mg（Ni）-Al HT exhibited high and stable activity in stationary SR, PO and dry reforming of methane and propane, the Ni/Mg（Al）O catalysts were drastically deactivated due to Ni oxidation by steam as purge gas when they were applied in DSS SR of methane. Such deactivation was effectively suppressed by doping trace amounts of noble metal on the catalysts by using a ＂memory effect＂ of HTs. Moreover, the noble metal-doped Ni/Mg（Al）O catalysts exhibited ＂intelligent＂ catalytic behaviors, i.e., self-activation and self-regenerative activity, leading to high and sustainable activity during DSS operation. Pt was the most effective among noble metals tested. The self-activation occurred by the reduction of Ni2＋ in Mg（Ni,Al）O periclase to Ni^0 assisted by hydrogen spillover from Pt （or Pt-Ni alloy）. The self-regenerative activity was accomplished by self-redispersion of active Ni^0 particles due to a reversible reductionoxidation movement of Ni between the outside and the inside of the Mg（Al）O periclase crystal; surface Ni^0 was oxidized to Ni2＋ by steam and incorporated into Mg（Ni2＋,Al）O periclase, whereas the Ni2＋ in the periclase was reduced to Ni^0 by the hydrogen spillover and appeared as the fine Ni^0 particles on the catalyst surface. Further a ＂green＂ preparation of the Pt/Ni/[Mg3.sAl]O catalysts was accomplished starting from commercial Mg3.5-AI HT by calcination, followed by sequential impregnation of Ni and Pt.展开更多
We present a very different cause of search engine user behaviors ——fascination. It is generally identified as the initial effect of a product attribute on users' interest and purchase intentions. Considering th...We present a very different cause of search engine user behaviors ——fascination. It is generally identified as the initial effect of a product attribute on users' interest and purchase intentions. Considering the fact that in most cases the cursor is driven directly by a hand to move via a mouse (or touchpad), we use the cursor movement as the critical feature to analyze the personal reaction against the fascinating search results. This paper provides a deep insight into the goal-directed cursor movement that occurs within a remarkably short period of time (<30 milliseconds), which is the interval between a user's click-through and decision-making behaviors. Instead of the fundamentals, we focus on revealing the characteristics of the split-second cursor movement. Our empirical findings showed that a user may push or pull the mouse with a slightly greater strength when fascinated by a search result. As a result, the cursor slides toward the search result with an increased momentum. We model the momentum through a combination of translational and angular kinetic energy calculations. Based on Fitts' law, we implement goal-directed cursor movement identification. Supported by the momentum, together with other physical features, we built different fascination-based search result reranking systems. Our experiments showed that goal-directed cursor momentum is an effective feature in detecting fascination. In particular, they show feasibility in both the personalized and cross-media cases. In addition, we detail the advantages and disadvantages of both click-through rate and cursor momentum for re-ranking search results.展开更多
4月25日,2016（第十四届）北京国际汽车展览会开幕。上汽菲亚特红岩动力总成有限公司（S F H上菲红）,携旗下新款发动机Cursor11及三大明星产品CURSOR13、CURSOR9、F1C精彩亮相,全方位呈现上菲红科技创新＂芯＂升级的实力与卓越动力产...4月25日,2016（第十四届）北京国际汽车展览会开幕。上汽菲亚特红岩动力总成有限公司（S F H上菲红）,携旗下新款发动机Cursor11及三大明星产品CURSOR13、CURSOR9、F1C精彩亮相,全方位呈现上菲红科技创新＂芯＂升级的实力与卓越动力产品新飞跃的竞争力,更是展现了上菲红全系列动力提供商形象。展开更多
基金supported by the New Energy and Industrial Technology Development Organization (NEDO),Japan
文摘Trace amounts of noble metal-doped Ni/Mg（AI）O catalysts were pre- pared starting from Mg-Al hydrotalcites （HTs） and tested in daily start-up and shut-down （DSS） operation of steam reforming （SR） of methane or partial oxidation （PO） of propane. Although Ni/Mg（Al）O catalysts prepared from Mg（Ni）-Al HT exhibited high and stable activity in stationary SR, PO and dry reforming of methane and propane, the Ni/Mg（Al）O catalysts were drastically deactivated due to Ni oxidation by steam as purge gas when they were applied in DSS SR of methane. Such deactivation was effectively suppressed by doping trace amounts of noble metal on the catalysts by using a ＂memory effect＂ of HTs. Moreover, the noble metal-doped Ni/Mg（Al）O catalysts exhibited ＂intelligent＂ catalytic behaviors, i.e., self-activation and self-regenerative activity, leading to high and sustainable activity during DSS operation. Pt was the most effective among noble metals tested. The self-activation occurred by the reduction of Ni2＋ in Mg（Ni,Al）O periclase to Ni^0 assisted by hydrogen spillover from Pt （or Pt-Ni alloy）. The self-regenerative activity was accomplished by self-redispersion of active Ni^0 particles due to a reversible reductionoxidation movement of Ni between the outside and the inside of the Mg（Al）O periclase crystal; surface Ni^0 was oxidized to Ni2＋ by steam and incorporated into Mg（Ni2＋,Al）O periclase, whereas the Ni2＋ in the periclase was reduced to Ni^0 by the hydrogen spillover and appeared as the fine Ni^0 particles on the catalyst surface. Further a ＂green＂ preparation of the Pt/Ni/[Mg3.sAl]O catalysts was accomplished starting from commercial Mg3.5-AI HT by calcination, followed by sequential impregnation of Ni and Pt.
基金the National Natural Science Foundation of China (Grant Nos. 61672368, 61373097, and 61672367)the Research Foundation of the Ministry of Education and China Mobile (MCM20150602)the Science and Technology Plan of Jiangsu (BK20151222).
文摘We present a very different cause of search engine user behaviors ——fascination. It is generally identified as the initial effect of a product attribute on users' interest and purchase intentions. Considering the fact that in most cases the cursor is driven directly by a hand to move via a mouse (or touchpad), we use the cursor movement as the critical feature to analyze the personal reaction against the fascinating search results. This paper provides a deep insight into the goal-directed cursor movement that occurs within a remarkably short period of time (<30 milliseconds), which is the interval between a user's click-through and decision-making behaviors. Instead of the fundamentals, we focus on revealing the characteristics of the split-second cursor movement. Our empirical findings showed that a user may push or pull the mouse with a slightly greater strength when fascinated by a search result. As a result, the cursor slides toward the search result with an increased momentum. We model the momentum through a combination of translational and angular kinetic energy calculations. Based on Fitts' law, we implement goal-directed cursor movement identification. Supported by the momentum, together with other physical features, we built different fascination-based search result reranking systems. Our experiments showed that goal-directed cursor momentum is an effective feature in detecting fascination. In particular, they show feasibility in both the personalized and cross-media cases. In addition, we detail the advantages and disadvantages of both click-through rate and cursor momentum for re-ranking search results.
文摘4月25日,2016（第十四届）北京国际汽车展览会开幕。上汽菲亚特红岩动力总成有限公司（S F H上菲红）,携旗下新款发动机Cursor11及三大明星产品CURSOR13、CURSOR9、F1C精彩亮相,全方位呈现上菲红科技创新＂芯＂升级的实力与卓越动力产品新飞跃的竞争力,更是展现了上菲红全系列动力提供商形象。
