摘要：Hybrids,produced by hybridization of proteins,peptides,DNA,and other new biomolecules with polymers,often have unique functional *** properties,such as biocompatibility,stability and specificity,lead to various smart *** review mainly introduces biomolecule polymer hybrid materials by reversible deactivation radical polymerization(RDRP),emphasizing reverse addition-fragmentation chain transfer(RAFT)polymerization,and nitroxide mediated polymerization(NMP).It includes the methods of RDRP to improve the biocompatibility of biomedical materials and organisms by surface *** key to the current synthesis of biomolecule polymer hybrids is to control ***,this review describes several different kinds of biomolecule polymer hybrid materials and their applications in the biomedical *** progresses provide ideas for the investigation of biodegradable and highly bioactive biomedical soft tissue *** research hotspots of nanotechnology in biomedical fields are controlled drug release materials and gene therapy carrier *** showed that RDRP method could improve the therapeutic effect and reduce the dosage and side effects of the ***,by means of RDRP,the original materials can be modified to develop intelligent polymer materials as membrane materials with selective permeability and surface modification.

摘要：To create a scaffold that is suitable for the construction of tissue-engineered skin, a novel asymmetric porous scaffold with different pore sizes on either side was prepared by combining a collagen-chitosan porous membrane with fibrin glue. Tissue-engineered skin was fabricated using this asymmetric scaffold, fibroblasts, and a human keratinocyte line (HaCaT). Epidermal cells could be seen growing easily and achieved confluence on the fibrin glue on the upper surface of the scaffold. Scanning electron microscopy showed typical shuttle-like fibroblasts adhering to the wall of the scaffold and fluorescence microscopy showed them growing in the dermal layer of the scaffold. The constructed composite skin substitute had a histological structure similar to that of normal skin tissue after three weeks of culture. The results of our study suggest that the asymmetric scaffold is a promising biologically functional material for skin tissue engineering, with prospects for clinical applications.

摘要：Named entity recognition （NER） is a core component in many natural language processing applications. Most NER systems rely on supervised machine learning methods, which depend on time-consuming and expensive annotations in different languages and domains. This paper presents a method for automatically building silver-standard NER corpora from Chinese Wikipedia. We refine novel and language-dependent features by exploiting the text and structure of Chinese Wikipedia. To reduce tagging errors caused by entity classification, we design four types of heuristic rules based on the characteristics of Chinese Wikipedia and train a supervised NE classifier, and a combined method is used to improve the precision and coverage. Then, we realize type identification of implicit mention by using boundary information of outgoing links. By selecting the sentences related with the domains of test data, we can train better NER models. In the experiments, large-scale NER corpora containing 2.3 million sentences are built from Chinese Wikipedia. The results show the effectiveness of automatically annotated corpora, and the trained NER models achieve the best performance when combining our silver-standard corpora with gold-standard corpora.

摘要：Metal‐organic framework(MOF)‐derived nanomaterials have attracted widespread attention,because the excellent features,such as high surface area,porosity and tunable properties are inherited from ***,the derivatives avoid the poor conductivity and stability of ***‐derived nanomaterials can easily be regulated by a specific selection of metal nodes and organic linkers,resulting in multifunctionality in *** derivatives can be used not only as semiconductor photocatalysts,but also as co‐catalysts for photocatalytic hydrogen evolution,CO_(2) reduction,pollutants degradation,*** review focuses on the multifunctional applications of MOF derivatives in the field of *** researches in recent years are analyzed and summarized from the aspects of preparation,modification and application of MOF *** the end of the review,the development and challenges of MOF derivatives applied in photocatalysis in the future are put forward,in order to provide more references for further research in this field and bring new inspiration.

摘要：针对传统控制策略下两级式储能变流器功率变化时的暂态性能差和直流母线电压波动大的问题,该文设计了一种基于有限时间观测器的滑模自抗扰控制(ADRC)策略,并将该控制策略应用于变流器的功率控制和双向DC-DC变换器的直流母线电压控制中以提高系统的暂态性能。首先,该控制策略以自抗扰控制(ADRC)为基础,将变流器之间的耦合部分归入集总扰动中,通过有限时间观测器快速、精准地估计扰动,并将扰动估计值通过前馈补偿以提高控制器的解耦能力;其次,采用基于改进的变速趋近律和积分滑模设计反馈控制律以提高误差的收敛速度和抗扰性能;再次,根据Lyapunov理论证明了该文控制的稳定性和有限时间收敛性;最后,进行了仿真及实验验证。结果表明,该文所提控制策略较PI控制和ADRC策略具有更好的解耦效果,并减小了并网电流谐波,提高了系统暂态响应能力。

摘要：Due to the enhanced electrochemical activities,mixed metal oxides offer new and fascinating opportunities for high-performance supercapacitor ***,sluggish ionic and electronic kinetics within the electrode fundamentally limit further improvement of their electrochemical *** compensate for the deficiency,a flexible electrode(CNTF/Ni-Co-Mn-Mo NS/CNTN)composed of vertically-aligned areolate quaternary metal oxide nanosheets sandwiched between carbon nanotubes(CNTs)is constructed in this study,which demonstrates a unique hierarchical porous structure that can provide three-dimensional transport channels for both ions and *** vertically aligned areolate quaternary metal oxide nanosheets enable increased exposed surface area and paths for ion transport,diffusion and redox reactions,resulting in an evident enhancement in electrochemical ***,the CNT networks provide improved conductivity,which can accelerate the electron *** a result,the flexible supercapacitor based on the CNTF/Ni-Co-Mn-Mo NS/CNTN electrode demonstrates a specific areal capacitance of 3738 m F cm^-2,corresponding to a high energy density of 1.17 m W h cm^-2,which outperforms most of the flexible devices reported ***,excellent flexibility of up to 180°bend and superior performance stability of 87.87%capacitance retention after 10,000 charge-discharge cycles can be *** unique design opens up a new way in the development of flexible energy storage devices with high performance.

摘要：为了对同一批次的螺旋电缆进行抽样检测,需要借助于专用的拉伸疲劳试验设备来实施。针对目前该行业中所使用的相关试验设备的不足,提出了一种采用普通电机驱动、拉伸行程及频率可调、具备线芯断裂记录功能的新型设备。介绍了试验设备的设计制造方案,并着重对机构设计和构件设计过程进行了具体的阐述及论证。

摘要：针对新能源电力系统中的周期性拒绝服务(denial-of-service, DoS)攻击和通信时滞,提出一种基于事件触发的滑模负荷频率控制(load frequency control, LFC)策略,以解决控制信号丢失和频率偏差增大的问题。首先建立网络攻击和通信时滞下的新能源互联电力系统LFC模型,采用广义互相关(generalized cross correlation, GCC)估计在线检测系统时滞,通过滑模控制算法降低时滞的影响并增强系统的鲁棒性。其次,基于周期性事件触发机制设计滑模控制策略,根据划分的时间间隔确定采样状态来减少网络中的数据交换量,以应对周期性DoS攻击。最后,在Matlab/Simulink中进行仿真实验分析,仿真结果验证了所设计的控制策略能够有效克服网络攻击和通信时滞的影响,提高了新能源互联电力系统的频率稳定性。

摘要：针对现有会话推荐算法缺乏对属性信息利用的问题,提出一种基于双图神经网络的会话推荐算法(SR-DGNN)。分别构建会话图和全局相似图学习项目的时序特征和内容特征表示,设计相似度图卷积网络(S-GCN)对全局相似图进行建模。设计基于注意力机制的融合策略对项目的特征表示进行聚合,获取会话的全局表示。综合考虑用户的长期和短期兴趣,预测用户偏好。在KKBOX和MIND两个数据集上进行了大量实验,实验结果表明,所提模型优于现有基准模型。

摘要：随着电动汽车、光伏发电等越来越多的新型电网交互型设备接入楼宇,以往的楼宇变电站难以处理复杂的能量流动,导致能量传递效率降低、接口复杂化和电能质量变差的现象。为此,提出一种无线电能路由器与电能质量控制方法。首先,为设计高效的能量流动控制方法,提出无线电能路由器构成的等效模型;其次,为了在所有负载、电能质量情况中保持高效的能量流动,对不同负载、电能质量情况进行分类并给出相应的控制参考量;随后,基于所有分类的控制参考量,设计对不同负载、电能质量情况下的功率控制方法;最后,为验证所提结构和控制方法的可行性,设计相对应情况的仿真案例。所提无线电能路由器可以为楼宇提供一种统一接入电网交互型设备的解决方案,具有重要的工程意义。