摘要：Metal halide perovskite(MHP)has become one of the most promising materials for photocatalytic CO_(2)reduction owing to the wide light absorption range,negative conduction band position and high reduction ***,photoreduction of CO_(2)by MHP remains a challenge because of the slow charge separation and ***,a cobalt single-atom modified nitrogen-doped graphene(Co-NG)cocatalyst is prepared for enhanced photocatalytic CO_(2)reduction of bismuth-based MHP Cs_(3)Bi_(2)Br_(9).The optimal Cs_(3)Bi_(2)Br_(9)/Co-NG composite exhibits the CO production rate of 123.16μmol g-1 h-1,which is 17.3 times higher than that of Cs_(3)Bi_(2)Br_(9).Moreover,the Cs_(3)Bi_(2)Br_(9)/Co-NG composite photocatalyst exhibits nearly 100%CO selectivity as well as impressive long-term *** carrier dynamic characterizations such as Kelvin probe force microscopy(KPFM),single-particle PL microscope and transient absorption(TA)spectroscopy demonstrate the vital role of Co-NG cocatalyst in accelerating the transfer and separation of photogenerated charges and improving photocatalytic *** reaction mechanism has been demonstrated by in situ diffuse reflectance infrared Fourier-transform spectroscopy *** addition,in situ X-ray photoelectron spectroscopy test and theoretical calculation reveal the reaction reactive sites and reaction energy barriers,demonstrating that the introduction of Co-NG promotes the formation of~(*)COOH intermediate,providing sufficient evidence for the highly selective generation of *** work provides an effective single-atom-based cocatalyst modification strategy for photocatalytic CO_(2)reduction and is expected to shed light on other photocatalytic applications.

摘要：To investigate the impact of dynamic assessment(DA)on the development of speaking skills,a case study was conducted,recruiting a non-English major *** was constructed following the design combining sandwich and cake format with an interactionist *** collect data,a profile was designed in accordance with the China’s Standards of English Language Ability(CSE)to record the learner’s changes.A semi-structured interview was conducted to reveal his perspectives on *** generated profile with specific mediator-learner’s moves revealed the learner’s microgenetic development in both organizational knowledge and oral expression strategy *** thematic analysis of the interview demonstrated the learner’s positive experience with DA,while also unveiling the weak points of ***,the operational framework for applying interactionist DA in the oral classroom was discussed,and the complementary relationship between DA and traditional teaching and testing practices was highlighted.

摘要：深度神经网络(deep neural network,DNN)在各个领域获得了巨大成功,由于其需要高额的计算和储存成本,难以直接将它们部署到资源受限的移动设备端。针对这个问题,对网络中的全局滤波器重要性评估进行了研究,提出滤波器弹性的通道剪枝压缩方法以轻量化神经网络的规模。该方法先设置层间局部动态阈值改进L1正则化(L1 lasso)稀疏训练中剪枝过度的不足;然后将其输出乘以通道缩放因子替换普通的卷积层模块,利用滤波器的弹性大小定义全局滤波器的重要性,其数值由泰勒公式估计得出并排序,同时设计新的滤波器迭代剪枝框架,以平衡剪枝性能和剪枝速度的矛盾;最后利用改进的L1正则化训练和全局滤波器重要性程度进行复合通道剪枝。在CIFAR-10上使用所提方法对VGG-16进行实验,减少了80.2%的浮点运算次数(FLOPs)和97.0%的参数量,而没有明显的准确性损失,表明了方法的有效性,能大规模地压缩神经网络,可部署于资源受限的终端设备。

摘要：现有的基于深度学习的目标检测模型中,由于复杂天气使得现有方法的精度大幅降低.因此为了有效地消除不同天气场景带来的域差异问题,提出一种多域动态平均教师模型.首先引入多域平均教师模块,为多个不同天气场景下目标域数据生成伪标签;然后引入基于学生网络的风格迁移模块,解决多域任务中学生网络对不同目标域泛化能力差的问题,可有效地减小源域与不同目标域之间的差异,提升学生网络对不同目标域的泛化能力;最后提出基于教师网络的动态过滤伪标签模块,根据教师网络对不同目标域的学习效果动态地调整过滤伪标签的阈值,提升每个目标域伪标签质量.在FoggyCityscapes&RainCityscapes和Dusk-rain&Night-rain数据集上的实验结果表明,所提模型分别获得了40.3%和31.4%的精度,在雨天、雾天和夜晚等多种复杂天气场景下都优于对比方法.

摘要：虎头帽是中国民间传统儿童服饰的经典样式之一,是虎图腾文化在人们生活中的发展和延续。以中原服饰文化馆馆藏的虎头童帽为研究对象,从装饰图案、造型特征、色彩特征和工艺特征4个方面对中原地区虎头帽的艺术特征进行研究,通过分析虎头帽的本体形式,解读虎头帽的文化寓意。虎头帽作为中原地区传统民间的手工艺品,拥有繁复多样的装饰、生动逼真的造型、朴实热烈的色彩、精细的制作工艺,传递了人们对儿童健康成长、平安如意的祝福。

摘要：压电材料的压电-温度特性会直接影响到压电器件的工作稳定性,是压电器件研发的重要依据。文中基于准静态测量方法研制上、下位机系统,实现了原位压电-温度特性测试。其次,设计开发了变温管式炉、激振器驱动、信号调理与采集电路,构建了准确的滤波与工频陷波算法。实测结果表明,所设计系统测试结果稳定,能够准确测量压电-温度特性并标定压电材料相变温度,可为压电器件设计提供重要的参考。

摘要：城市发展与文化记忆是相互依存的。在全球气候变化和城市化加速发展的背景下,韧性城市以应对各种挑战显得尤为重要。本文提出将文化记忆与韧性设计结合,尝试用文化记忆的3个维度相结合方法提升城市韧性。将融入文化记忆保护与韧性城市发展中,进一步实现文化传承、提升城市韧性、促进社会和谐的可持续发展模式。

摘要：将光伏/光热利用与地源热泵相互耦合,有望利用光伏余热避免热泵性能衰减,还可利用光伏电力部分满足热泵电能需求,前景广阔。构建了低倍聚光光伏/光热与地源热泵的集成系统运行仿真模型,对系统开展了运行性能分析;并进一步研究了系统全生命周期成本的关键影响规律。结果表明:集成系统光伏年均发电效率达17.73%,较单一运行系统提升9.58%,光伏/光热装置的光伏余热可有效减少土壤温度衰减,热泵长时运行性能较参比系统提升16.58%;系统运维成本随光伏/光热装置和地源热泵规模增加而减少,投资成本随之增加,总的全生命周期成本随规模增加先减后增;以全生命周期成本为目标函数,基于粒子群算法开展系统经济性优化,全生命周期成本较最大规模容量设计降低31.52%。相关结论可为光伏/光热与地源热泵集成系统优化设计提供理论参考。

摘要：无线传感网络(WSN)近年来在不同的领域得到了广泛的应用,基于此,采用Zigbee无线网络数据协议,搭建无线传感系统,采用TI公司的CC2530F256无线通信芯片进行硬件和软件的详细设计.可将节点数据传送至协调员或计算机终端,具备显示和控制功能,收集和分析有关数据信息.并分析其搭载不同类型传感器在环境、工业、农业、智慧城市、军事等领域的的具体应用.

摘要：针对二氧化碳培养箱的校准检测需多台设备配合使用、不能同时自动采集数据、集成度较低等问题,本文设计了一种全参数自动巡检仪。通过对各个参数的校准方法和校准规范进行分析,确定了校准测量标准,介绍了设计的巡检仪的工作原理,并分别进行试制、电测实验和误差分析。结果表明:该巡检仪满足校准规范要求。