摘要：A BiOCl-Bi12O17Cl2 nanocomposite with a high visible-light response and a low photoinduced electron-hole pair recombination rate was successfully synthesized using an ultrasonic-hydrothermal *** texture,structure,optical,and photocatalytic properties of the composite were *** results showed that the composite had a sheet flower-like structure with a large specific surface ***-visible diffuse reflection spectra and photoluminescence spectra showed that the composite had an excellent visible-light response and a low recombination rate of photoinduced electron hole *** photocatalytic property of the composite was evaluated by the removal efficiency of rhodamine B and ciprofloxacin under visible-light *** composite’s reaction rate constant of removing rhodamine B(/ciprofloxacin)was approximately 8.14(/4.94),42.63(/11.91)and 64.66(/36.07)times that of Bi12O17Cl2,P25,and BiOCl,***,the composite showed a wide applicable pH range and excellent *** analysis showed that photogenerated holes played a dominant role and·O2–also contributed to photocatalytic *** summary,this study presents a high-efficiency photocatalyst for wastewater treatment.

摘要：对于城市和农村的建设来说,利用和传承历史文化遗产,对于保持历史文化的连续性、促进城乡建设的高质量发展、增强文化自信以及建设社会主义文化大国,都具有十分重要的意义。文章阐述了现代建筑地域化的特点,根据历史建筑文化传承与发展关联性的国内外理论研究,以城市设计角度审视历史建筑文化传承与发展的特点,结合北京前门大街历史建筑文化传承与发展为案例来进行分析研究,提出了进行古建筑传承与发展策略。我们应当本着对历史和人民负责的态度,强化制度的顶层设计,构建一个分类科学、保护力度大且管理有效的城乡历史文化传承体系。

摘要：多模态情感分析旨在通过用户上传在社交平台上的视频来判断用户的情感.目前的多模态情感分析研究主要是设计复杂的多模态融合网络来学习模态之间的一致性信息,在一定程度上能够提升模型的性能,但它们大部分都忽略了模态之间的差异性信息所起到的互补作用,从而导致情感分析出现偏差.本文提出了一个基于双编码器表示学习的多模态情感分析模型DERL(dual encoder representation learning),该模型通过双编码器结构学习模态不变表征和模态特定表征.具体来说,我们利用基于层级注意力机制的跨模态交互编码器学习所有模态的模态不变表征,获取一致性信息;利用基于自注意力机制的模态内编码器学习模态私有的模态特定表征,获取差异性信息.此外,我们设计两个门控网络单元对编码后的特征进行增强和过滤,以更好地结合模态不变和模态特定表征,最后在融合时通过缩小不同多模态表示之间的L2距离以捕获它们之间潜在的相似情感用于情感预测.在两个公开的数据集CMU-MOSI和CMU-MOSEI上的实验结果表明该模型优于一系列基线模型.

摘要：针对步进电机传统开环控制运行效果欠佳的问题,结合矢量控制算法对两相混合式步进电机进行控制,通过逆变器产生正弦波电流对电机进行驱动。由于步进电机气隙磁场畸变和PWM逆变器的死区效应,使步进电机的运行电流掺杂大量谐波,低速工作时尤为严重。为了改善电机低速运行性能、抑制谐波干扰,结合混合式步进电机矢量控制的电流环进行优化,通过自适应线性神经网络(ADALINE)算法将谐波进行提取与抑制,然后进行电流方向判断,对逆变器的输出进行补偿。实验证明,所提出的补偿策略能够有效抑制两相PWM逆变器的电流谐波,改善波形、降低电机低速运行的转矩脉动。

摘要：Heterogeneous gold nanocatalysts have both inspired researchers with their unique catalytic performance and frustrated them due to the contradictions observed in their activities and stabilities.A recent breakthrough has shown that gold nanoparticles(NPs)can retain their catalytically active size over a MgGa2O4 spinel support upon sintering at high ***,we report the catalytic activity of anti-sintering AuGMgGa2O4 for use in water gas shift reaction(WGSR)and catalytic combustion reactions,and the promoting effect of *** adding ceria to 800℃-aged AuGMgGa2O4,the CO conversion in the WGSR was increased from ~1.5% to ~34.0% at 450 ℃,and the “light-off” temperatures(T50)for methane combustion and CO oxidation were decreased by ~80 and ~100 ℃,*** using XRD,HAADF-STEM,EDS mapping,H2-TPR,XPS,and DRIFTs confirmed the proximate contact of Au with ceria and their significant synergistic effect,which thereby combined the benefits of ceria toward the dissociation of H2O or O2 and the Au NPs toward activating CO or *** results show that this stepwise stabilization-activation strategy is efficient for rationally constructing stable and active gold nanocatalysts,which may open up possibilities for the wide application of gold nanocatalysts at elevated temperatures.

摘要：从构成与建筑关系入手,分析了立体构成设计在建筑形态中的艺术美感,倡导在构成设计中注重提出新的观念,大胆运用立体构成在建筑形态中体现的艺术美去传达人文主义情感,去创造构成形式的直觉意义。

摘要：根据用1/15模型,在造波水槽中进行试验获得气室的Δ Pi- Q、ηA- Q、 NA- Q特性,以及用300mm透平模型,在1000mm活塞式往复流透平试验台进行试验获得的对称翼透平、双向固定导叶冲动透平和双向自调节导叶冲动透平的CP-、ηT-特性,进行了气室与三种空气透平的匹配设计。表明在设计波况下,采用1.025m的双向自调节导叶冲动透平时,ηT·ηA达50.43%;采用0.975m的双向自调节导叶冲动透平时,ηT·ηA达46.66%;采用0.975m的双向固定导叶冲动透平时,ηT·ηA达33.66%;采用1.45m对称翼透平时,ηT·ηA仅为29.9%。并对四种不同匹配方案进行了对比分析。

摘要：通过对哈尔滨"红房子"工业遗产景观特征的分析,提出工业遗产景观改造从形式出发解决功能问题的设计手法,同时引入生态节能的技术性景观处理方式,并以2种对比强烈的空中桥廊延伸体验概念和极具艺术张力的地面弧线形景观带概念,讨论了这2种形式并存的功能性改造,以"脉络"理念诠释了哈尔滨"红房子"工业遗产景观改造设计中新与旧的共生与相融合,为以后的城市工业遗产景观改造提供新思路。

摘要：基于表面增强拉曼光谱技术(surface enhanced Raman spectroscopy,SERS),研制出对食品中乌洛托品进行现场快速分析检测的系统。检测系统由多功能前处理模块、拉曼光学模块、嵌入式主控模块三部分组成,实现了待测样品的前处理,拉曼光谱数据的产生、收集、传输与处理。其中,多功能前处理模块将化学实验中经常用到的离心、超声、挥发三种功能集于一体,精简了前处理实验中需要用到的设备;拉曼光学模块采用探头光路与分光系统合为一体的整体式设计,并在探头光路中使用数值孔径为0.6的非球面透镜,同时利用交叉非对称Czerny-Turner结构对分光系统进行了设计;嵌入式主控模块采用自主研发的FPGA+ARM双核心主控电路,配合CCD的制冷电路与驱动电路,搭载μC/OS-Ⅲ操作系统,实现了对CCD上拉曼光谱数据的采集、传输与处理。利用柠檬酸钠制备纳米金(liquid colloidal gold nanoparticle,LCP-1)作为增强试剂对乌洛托品进行检测,将乌洛托品的拉曼特征峰选取在1 047cm^(-1)处,对乌洛托品标准品和含有乌洛托品的腐竹与米粉样品进行检测实验,实验结果表明所设计的检测系统可以实现对乌洛托品的准确识别,对乌洛托品标准品的检测限可达0.01 mg·L^(-1),对腐竹和米粉样品中乌洛托品的检出限可达0.5 mg·L^(-1),检测时间小于20min,实现了食品中乌洛托品的现场快速检测。

摘要：With the consideration of the thermal management and heat sink requirements,a cooling device is designed and the thermal resistance of this device is calculated with a single 5 W power *** thermal design of a single 5 W power LED is reasonable,effective and the result has been *** design also instruct other power LEDs' thermal *** is a reliable and effective method for the design of power LED illumination lamps and lanterns.