摘要：利用贵金属pd的等离子体共振效应和形貌可控Bi2WO6的光催化协同作用,通过低温水热法设计合成具有高效可见光活性的花状g-C_(3)N_(4)/pd/Bi_(2)WO_(6)异质结复合催化剂.在可见光照射下,异质结复合催化剂光催化降解BZF的去除率均高于g-C_(3)N_(4),g-C_(3)N_(4)/Bi_(2)WO_(6),pd/g-C_(3)N_(4)和Bi_(2)WO_(6),其中,50%g-C_(3)N_(4)/pd/Bi_(2)WO_(6)对BZF的去除率为96%,是pd/g-C_(3)N_(4)的1.8倍,g-C_(3)N_(4)和Bi_(2)WO_(6)的2.7倍.基于表征分析可知,g-C_(3)N_(4)/pd/Bi_(2)WO_(6)复合催化剂中Bi_(2)WO_(6)呈现中心辐射花状纳米结构,并与层状pd/g-C_(3)N_(4)连接;贵金属pd可作为电子传输的介质,促进g-C_(3)N_(4)和Bi_(2)WO_(6)Z型异质结构的形成,有利于协同提升可见光催化活性.淬灭实验和EPR表征证实了·OH是g-C_(3)N_(4)/pd/Bi_(2)WO_(6)催化降解BZF的主要活性物质,LC-MS/MS分结果表明羟基化作用取代贝特链是BZF降解的主要路径.

摘要：冲压工艺DL图的设计过程复杂,方案多变,不仅型面需要根据模拟结果进行更改,修边工序也需要根据结构空间和强度等因素进行多次变更,这就导致需要经过不断的更改和尝试,才能得到稳定的DL图。AutoForm-pd是基于CATIA软件开发的冲压工艺建型软件,可以借助CATIA平台实现全工序全参数化的建型过程。利用AutoForm-pd软件建立了DL图设计模板,提出了整体规划工艺方案、分段建型的思路,有效的减少了因工艺方案更改而造成的DL图更改时间,使DL图设计效率提升100%以上。

摘要：Herein,we report the excellent De-NO_(x)performance of La0.7Sr0.3MnO3(LSM)perovskite-supported pd catalysts(pd-LSM)in alternating lean-burn/fuel-rich atmospheres using C3H6 as reductant and describe the in situ activation of the pd catalysts via metal-support interaction(MSI)*** NO_(x)reduction conversion of the pd-LSM catalyst increased significantly from 56.1%to 90.1%and the production of N2O was *** results demonstrated that this behavior was mainly attributed to the in situ transformation of pd2+into pd0 during the *** generated pd0 species could readily activate the C3H6 reductant and achieve an eight-fold higher turnover frequency than pd2+for the reduction of NO_(x).Moreover,excessive MSIs inhibited the in situ generation of pd0,and thereby,lowered the De-NO_(x)activity of the catalyst even at high pd *** addition,the pd-LSM catalysts exhibited much higher S tolerance than conventional Al_(2)O_(3)-supported *** study provides a new approach for analyzing and designing highly active metal catalysts operated under dynamic alternating oxidizing/reducing atmospheric conditions.

摘要：Nanocatalysts consisting of three‐dimensionally ordered macroporous(3DOM)TiO2‐supported ultrafine pd nanoparticles(pd/3DOM‐TiO2‐GBMR)were readily fabricated by gas bubbling‐assisted membrane reduction(GBMR)*** catalysts had a well‐defined and highly ordered macroporous nanostructure with an average pore size of 280 *** addition,ultrafine hemispherical pd nanoparticles(NPs)with a mean particle size of 1.1 nm were found to be well dispersed over the surface of the 3DOM‐TiO2 support and deposited on the inner walls of the *** nanostructure of the 3DOM‐TiO2 support ensured efficient contact between soot particles and the *** large interface area between the ultrafine pd NPs and the TiO2 also increased the density of sites for O2 activation as a result of the strong metal(pd)‐support(TiO2)interaction(SMSI).A pd/3DOM‐TiO2‐GBMR catalyst with ultrafine pd NPs(1.1 nm)exhibited higher catalytic activity during diesel soot combustion compared with that obtained from a specimen having relatively large pd NPs(5.0 nm).The T10,T50 and T90 values obtained from the former were 295,370 and 415°*** the activity and nanostructure of the pd/3DOM‐TiO2‐GBMR catalyst were stable over five replicate soot oxidation *** results suggest that nanocatalysts having a 3DOM structure together with ultrafine pd NPs can decrease the amount of pd required,and that this approach has potential practical applications in the catalytic combustion of diesel soot particles.

摘要：Photocatalytic hydrogen production represents a promising strategy for clean, sustainable, and environmentfriendly energy supply. Up to now, great efforts have been devoted to designing the photocatalysts with noble metal as co-catalyst for visible-light-driven hydrogen evolution, while more efficient photocatalytic systems are still a major challenge. Herein, we report a facile strategy for synthesizing faceto-face ultrathin pd nanosheets-amorphous carbon nitride(pd NSs-ACN) structure with large contacting interface and short electronic transmission pathway, which can work as an efficient photocatalyst for hydrogen production. The synthesis starts with the growth of ultrathin pd NSs, followed by assembly with the visible-light-response ACN through a simple stirring and annealing procedure. The resultant two dimensional face-to-face structures deliver an average hydrogen generation rate of 1.45 mmol h-1g-1 at a temperature of 25℃,almost 2.6 times higher than that of pd Nps-ACN with particle-to-face structural feature. The efficient photocatalytic activity is ascribed to the formation of high-density of active sites between ultrafine face-to-face contacted pd NSs and the ACN, which cooperate more synergistically towards photocatalytic hydrogen production. The face-to-face engineered pd NSs-ACN hybrids also offer a good stability revealed by photocatalytic hydrogen production measurements. The extraordinary performance highlights a powerful engineering model for designing other face-to-face contacting co-catalyst/photocatalysts, which will be a great impetus to optimize new catalytic transformations.

摘要：A novel 0.1% pd-0.05% （mass fraction） Pt/stainless steel wire mesh catalyst was prepared for volatile organic compounds （VOCs） elimination. The catalyst was synthesized by stainless steel wire mesh as support and then treated by anodic oxidation technology to develop a porous membrane on the support. During the anodic oxidation process, various electrolytes were used to investigate the formation of porous membrane. And the catalytic performance of the catalysts was tested by using toluene and acetone combustion as model reaction. The temperatures of complete toluene and acetone conversion were decreased to 180℃ and 240 ℃, respectively. The morphologies of the stainless steel wire mesh supports and catalysts were characterized by means of scanning electron microscopy （SEM） and temperature-programmed reduction （TPR）.

摘要：气体绝缘组合电器(gas insulated switchgear, GIS)的外壳为圆筒型结构,而现有局部放电(partial discharge,pd)特高频(ultra high frequency, UHF)检测天线多采用FR-4环氧树脂刚性基底,天线内置到GIS内部时可能会影响设备内部的电场分布,或需要对GIS的法兰盘进行复杂的结构改造,不利于现场应用。为解决上述问题,设计了一种基于热固性聚酰亚胺柔性基底的UHF阿基米德螺旋天线传感器,且采用正弦加载的方法实现了天线直径的小型化。通过仿真和实测分析了该柔性天线的辐射特性,然后通过仿真分析了该柔性天线内置对GIS内部电场的影响,同时利用搭建的试验平台对其pd检测性能进行了实测。结果表明:该柔性天线直径为149 mm,较未小型化时缩小了24.7%,本体质量仅为15.1 g;在620 MHz~3 GHz频带内,该柔性天线在弯曲半径分别为0、250、300和350mm时的电压驻波比均不超过2.5,最大实际增益为5.5dB,在0.3~1.5GHz频带内的平均有效高度达到13.5 mm,辐射性能优异;实际安装时可忽略该柔性天线对GIS内部电场分布的影响,且其在弯曲形变前后及内置后均能有效检测pd信号。研究成果为内置式天线传感器的设计提供了参考。

摘要：通过低温氧化法在活性碳表面修饰聚吡咯(PPy-C),并以PPy-C为载体制备了纳米pd催化剂(pd/PPy-C).采用X射线衍射、扫描电镜、透射电镜等手段对载体PPy-C及催化剂pd/PPy-C进行了表征,电化学测试结果表明,pd/PPy-C催化剂电极不但能够增强催化剂对甲酸催化氧化的活性,而且还能够大幅度提高催化剂的稳定性,因此以PPy-C为载体的pd/PPy-C催化剂是一类具有潜在应用前景的直接甲酸燃料电池阳极催化剂.通过分析电化学比表面随循环伏安次数的变化及多电势阶跃实验结果表明,催化剂电极活性衰减的主要原因是载体被氧化及电极表面积累强吸附物种的结果.

摘要：通过机构设计、硬件开发、软件策略等方面,搭建两轮直立电动车控制系统,满足了直立车的控制要求。设计以陀螺仪和加速计为传感器的姿态获取模块,利用卡尔曼滤波算法提高控制精度。基于系统结构模型,采用牛顿力学的分析方法构建两轮自平衡直立车动力学方程。设计了模糊pd控制器,以直立车的位移和速度为输入变量进行模糊控制器控制,倾斜角度和角速度由pd控制器控制。最后,建立了直立车实时控制系统平台,用于两轮自平衡直立车的参数调试及实时控制。实验结果表明,该系统具有较好的稳定性,实时响应性高,具有较高的市场推广价值。

摘要：以非双通的多孔氧化铝(AAO)(Al基底为支撑体)为模板,基底Al作为还原剂,在AAO孔道内原位合成了pd单质(pd/AAO)。本文详细研究了AAO阻挡层的去除以及pd/AAO的酸腐蚀处理后的情况。采用扫描电子显微镜观察了不同条件下形成的形貌,提出了一个近似合理的生成pd单质的机理。评价了其对苯硼酸和对溴苯甲醛Suzuki反应的活性。摩尔分数0.06%pd催化剂在温和的实验条件下可以高效催化Suzuki反应,产率达到99.8%。pd/AAO固体片状结构在液相反应中直接从溶液中取出即可进行下一次反应,易于分离和回收,可使用性强。此研究为有机反应异相催化剂的设计提供了一个有效的思路,在实际应用中具有一定的指导意义。