摘要：In situ studies of catalysts play valuable roles in observing phase transformation, understanding the corresponding surface chemistry and the mechanism of the reaction. In this paper, ceria promoted cobalt oxide was prepared by the calcination method and investigated for the CO oxidation. The microstructure and morphology of CeO2-Co3O4 were investigated by the Scanning Electron Microscope, High-resolution transmission electron microscopy, Raman and X-ray photoelectron spectroscopy characterization. The effect of CeO2 doping on Co3O4 for CO oxidation was characterized by in situ X-ray Diffraction (in situ XRD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). In situ XRD was carried out under H2 atmosphere to evaluate the redox property of catalysts. The results indicated that the ceria doping can enhance the reducibility of Co2+ and promote the Co3+-Co2+-Co3+ cycle, owing to the oxygen replenish property of CeO2. Furthermore, adsorbed carbonate species on the surface of CeO2-Co3O4 were investigated by in situ-DRIFTS experiment. It was turned out that carbonate species on ceria promoted cobalt oxide catalysts showed different IR peaks compared with pure cobalt oxide. The carbonate species on ceria promoted catalyst are more active, and similar to free state carbonate species with weak bonding to catalyst surface, which can effectively inhibit catalyst inactivation. This study revealed the mechanism of ceria promoting CO oxidation over cobalt oxide, which will provide theoretical support for the design of efficient CO oxidation catalysts.

摘要：Hollow metal-organic frameworks(MOFs)and their derivatives have attracted more and more attention due to their high specific surface area and perfect morphological structure,which determine their large potential application in energy storage and catalysis ***,few researchers have carried out further modification on the outer shell of hollow MOFs,such as the perforation modification,which will endow hollow nanomaterials derived from MOFs with *** this paper,hollow MOFs of MIL-53(Fe)with perforated outer surface are successfully synthesized by using SiO2 nanospheres as the template via a self-assembly process induced by the coordination *** tightly packed mesopore structure makes the carbon outer shell of MOFs thinner,thus realizing the in-situ transformation from MOFs to hollow Fe3 O4/carbon,which exhibits perfect capacity approaching 1270 mA h g-1 even after 200 cycles at 0.1 A g-1,as an anode material in lithium ion batteries(LIBs)*** research provides a new strategy for the design and preparation of MOFs and their derivatives with multifunctionality for the energy applications.

摘要：当前的区域微电网多目标协同优化调度矩阵一般为单向的处理形式,虽然能够实现简单的调度优化目标,但是对于调度范围存在一定的限制,导致交互功率降低,为此提出对基于麻雀搜索算法的区域微电网多目标协同优化调度方法的设计与验证分析。根据实际优化调度需求及标准的变化,先进行约束条件的设置,同时测算出对应的目标函数。采用多阶的模式,扩大实际的调度范围,并设计多阶并网协同运行调度矩阵,以此为基础,构建麻雀搜索算法下微电网协同优化调度模型,并采用横纵交叉的处理方式实现优化调度。经过6:00、12:00、18:00以及24:004个时刻的调度研究,在麻雀搜索算法的辅助下,优化完成之后,微电网的交互功率逐渐保持平稳,并未出现较为明显的波动,交互功率基本控制在70 kW以下,说明此种调度优化方式的针对性较强,调度的效率较高,可以确保微电网在运行的过程中保持平稳,具有实际的应用价值。

摘要：客船中央空调系统防病毒的关键是全新风。对此,全面提出并解释全新风设计的3层含义,即:回风不能与新风汇合之后重新送到室内;能量回收装置不能导致新风被回风污染;不可通过使用内循环空调控制温度,新风的换气次数很少。通过对空调负荷进行计算,对比不同中央空调系统的能耗,提出满足这3层含义的中央空调系统需根据不同的外界温度做出不同的设计,从而取得更好的节能效果。

摘要：多酚具有多种生物活性,但由于其稳定性差,限制了应用。综述了多酚与膳食成分通过非共价和/或共价相互作用形成的二元和三元体系,包括膳食成分对酚类物质稳定性和生物利用度的影响,以及膳食成分的理化性质和功能性质等方面的变化,并总结了近年来多酚-膳食成分复合物在递送系统、乳液、包装材料和食品保鲜加工方面的应用,以期为多酚膳食化合物的设计与应用提供参考。

摘要：以Atmega128单片机为核心,通过MPU6050传感器采集3轴加速度和陀螺仪数据,将采集到的数据经过卡尔曼滤波,然后通过四元素与欧拉角的转换,最终求解出飞行器在空中的飞行姿态。将遥控模块给定的期望信号与当前飞行器所处的姿态进行对比,然后经过系统中PID的自动调节,消除期望值与实际姿态之间存在的误差,使其可以在较恶劣的环境下稳定地飞行,完成各种飞行动作。最终实现四旋翼飞行器稳定飞行的控制要求。

摘要：蛇形机器人模仿蛇的身体结构与运动机理,具有体积小、自由度多等特点,在复杂环境中表现出优秀的运动性能。设计一种适用于狭小管道环境的蛇形机器人,采用模块化的构型,机器人共拥有5个自由度。利用Denavit-Hartenberg方法对机器人进行运动学分析,基于从机器人尾部到头部的前向轨迹跟踪控制算法,建立机器人的轨迹跟踪运动控制方法;设计实验样机并开展运动控制实验和实际管道转弯实验,验证了机器人结构设计的合理性、逆运动学的正确性和运动控制方法的有效性。

摘要：双立柱堆垛机工作过程中存在摇摆幅度大、平稳性较差的问题,严重时容易发生货物的掉落,甚至发生安全事故。针对上述问题,本文应用静力学分析与有限元模拟相结合的方法,对双立柱巷道式堆垛机的门架机构进行变形分析,结果显示在堆垛机立柱上端和上横梁连结处是最薄弱的地方。进一步对薄弱部位和关键零部件进行优化设计,与优化前进行对比,结果表明,堆垛机结构变形量减少5.40%,最大等效应力值降低8.28%,优化数据可为堆垛机可靠性的提高提供借鉴。

摘要：以槟榔鲜果为研究对象,研究不同水煮杀青时间(0,20,25和30 min)对槟榔主要营养物质及抗氧化活性的影响。结果表明,水煮杀青显著降低半纤维素含量,纤维素变化不明显,水煮杀青处理30 min时,木质素含量显著增加8.09%(P<0.05)。蛋白质和脂肪含量均逐渐降低,但脂肪变化显著,处理30 min时,脂肪含量较对照组显著降低21.55%(P<0.05)。槟榔的总酚和总黄酮含量均随杀青时间的延长呈先上升后下降趋势,抗氧化能力变化与之相似,水煮杀青20 min时均达到最大值。相关性分析说明,槟榔的总酚和总黄酮含量与其抗氧化能力呈极显著正相关(P<0.01)。水煮杀青20 min有利于槟榔营养物质和抗氧化能力的保持和提升。试验为槟榔的科学合理加工与高值化利用提供一定参考。

摘要：壁虎通过脚掌独特的外翻机制可以迅速地在壁面实现黏附与脱附。本文通过对壁虎脚掌外翻脱附过程的仿生研究,模仿壁虎外翻脱附机理,以形状记忆合金丝为驱动器,设计仿壁虎柔性脚掌,开展力学分析与计算。基于形状记忆合金的驱动特性及仿壁虎机器人的运动步态,设计了仿壁虎柔性脚掌的控制策略。最后分析了脚趾有无外翻动作脱附时的受力情况,实验测试了柔性脚趾的弯曲与外翻脱附性能,验证了仿壁虎柔性脚掌设计的有效性和可行性。