摘要：为了提高终端区不同气象场景下的交通流预测准确率,提出一种融合多元时序和模式挖掘(Multivariate time series and pattern mining,MTSPM)的终端区交通流预测模型。首先,给出了一种基于多元时间序列的终端区交通流预测模型,通过深度学习模型CNN-GrUA将终端区的交通需求、天气和策略特征进行融合并用于交通流预测;其次,针对交通流这一单变量时间序列,设计了一种基于趋势分段符号化的时间序列BOP(Bag-of-pattern)表示方法——TSSBOP,通过基于趋势的分段、符号化和模式表示来挖掘交通流序列中的内在模式;最后,根据两个模型在验证集上的预测精度进行加权融合,得到最终的终端区交通流预测值。在广州终端区的历史数据集上的对比实验表明,所提出的TSSBOP表示法能够有效挖掘出原始序列中的模式,所提出的基于MTSPM的终端区交通流预测模型能有效提高不同气象场景下的交通流预测性能。

摘要：By adopting the distributed problem-solving strategy, swarm intelligence algorithms have been successfully applied to many optimization problems that are difficult to deal with using traditional methods. At present, there are many well-implemented algorithms, such as particle swarm optimization, genetic algorithm, artificial bee colony algorithm, and ant colony optimization. These algorithms have already shown favorable performances. However, with the objects becoming increasingly complex, it is becoming gradually more difficult for these algorithms to meet human＇s demand in terms of accuracy and time. designing a new algorithm to seek better solutions for optimization problems is becoming increasingly essential. dolphins have many noteworthy biological characteristics and living habits such as echolocation, information exchanges, cooperation, and division of labor. Combining these biological characteristics and living habits with swarm intelligence and bringing them into optimization problems, we propose a brand new algorithm named the ‘dolphin swarm algorithm＇ in this paper. We also provide the definitions of the algorithm and specific descriptions of the four pivotal phases in the algorithm, which are the search phase, call phase, reception phase, and predation phase. Ten benchmark functions with different properties are tested using the dolphin swarm algorithm, particle swarm optimization, genetic algorithm, and artificial bee colony algorithm. The convergence rates and benchmark function results of these four algorithms are compared to testify the effect of the dolphin swarm algorithm. The results show that in most cases, the dolphin swarm algorithm performs better. The dolphin swarm algorithm possesses some great features, such as first-slow-then-fast convergence, periodic convergence, local-optimum-free, and no specific demand on benchmark functions. Moreover, the dolphin swarm algorithm is particularly appropriate to optimization problems, with more calls of

摘要：The rational design of efficient single-atomic(SA)catalysts is essential and highly desirable but impeded by the lack of sufficient acknowledge between structure and *** this end,it is critical to clarify the effect of the coordination structure of active metal centers on the catalytic activities for the design of such ***,we report that different coordination structures of SA Pt catalysts can dramatically influence their activities for anti-Markovnikov hydroboration of *** with the other two coordination structures(Pt-N4 and Pt-O2),the SA Pt species coordinated with three O atoms(Pt-O3)display the highest turnover number value of 3288 for the hydroboration reaction to access the important alkylboronic *** functional theory calculations reveal that a superior catalytic activity can be expected for alkene hydroboration over the three O coordinated Pt species due to the lowest reaction energy(ΔG)limiting step from the reaction phase diagram.

摘要：锂硫电池具有超高的理论能量密度(2567Wh·kg^(-1)),且其实际能量密度最高可达600Wh·kg^(-1)。然而,液态体系的Li-S电池和传统锂电池一样存在着安全隐患。用固态电解质取代电解液有望提高锂电池的安全性能,在近二十年受到了广泛的研究。对于固态锂硫电池来说,除了由于正极材料本身的不同带来的转化机制上的差别,固态电解质的物理化学性质也会显著影响其电化学行为。这篇综述分类讨论了已报道的不同固态锂硫电池体系在性能上的优缺点及其中主要的失效机制,对其能量密度低、循环稳定性差的原因及改善电池综合性能的策略进行了归纳分析,旨在从固态锂硫电池微观机制到全电池水平的工程化设计提供全面的理解,推动固态锂硫电池的进一步发展。

摘要：In this study, a membraneless, monolithic micro photocatalytic fuel cell with an air-breathing cathode was developed for simultaneous wastewater treatment and electricity generation. In this newly-developed micro photocatalytic fuel cell, the photoanode and cathode were arranged with a shoulder-to-shoulder design, forming two planar electrodes. Such design offers several advantages of enhanced mass transfer, uniform light distribution, short light transfer path, membrane elimination and easy fabrication, integration, and compatibility with other microdevices. The performance of this type fuel cell was evaluated by using methanol as a model pollutant under the alkaline condition. Experimental results indicated the developed micro photocatalytic fuel cell was able to show good photo-response to the illumination and satisfactory performance as well as durability. Parametric study on the cell performance was also performed. It was found that increasing the light intensity, methanol concentration andKOH concentration could improve the cell performance. But for the effect of the liquid flow rate, it was shown that the cell performance firstly increased with increasing the liquid flow rate and then decreased with further increasing the liquid flow rate. This study not only opens a new avenue for the design of the micro photocatalytic fuel cell but also is helpful for the optimization of the operating conditions.

摘要：The transmission and distribution of moisture in cement-based materials are of great significance to the properties and durability of materials. Traditional macro-humidity monitoring equipment in civil engineering cannot capture the microscale humidity inside cement-based materials in situ. In this paper, a method of using rhodamine 6G fluorescence to characterize the change in relative humidity in cement-based materials is proposed. Two kinds of moulding processes are designed, which are premixed and smeared after moulding, and the optimal preparation concentration is explored. The results showed that rhodamine 6G can reflect the relative humidity of cement-based materials in situ by its fluorescence intensity and had little effect on the hydration heat release and hydration products of cement-based materials;the fluorescence intensity was much higher when the internal relative humidity was 63% and 75%. The research results lead the application of polymer materials in the field of traditional building materials, help to explore the performance evolution law of cement-based materials in micro scale, and have important significance for the evolution from single discipline to interdisciplinary.

摘要：The optimization design of the power system is essential for stratospheric airships with paradoxical requirements of high reliability and low weight. The methodology of orthogonal experiment is presented to deal with the problem of the optimization design of the airship's power system. Mathematical models of the solar array, regenerative fuel cell, and power management subsystem (PMS) are presented. The basic theory of the method of orthogonal experiment is discussed, and the selection of factors and levels of the experiment and the choice of the evaluation function are also revealed. The proposed methodology is validated in the optimization design of the power system of the ZhiYuan-2 stratospheric airship. results show that the optimal configuration is easily obtained through this methodology. Furthermore, the optimal configuration and three sub-optimal configurations are in the Pareto frontier of the design space. Sensitivity analyses for the weight and reliability of the airship's power system are presented.

摘要：due to the fact that the turbine outlet temperature of aeroderivative three-shaft gas turbine is low,the conventional combined cycle is not suitable for three-shaft gas ***,the humid air turbine(HAT)cycle provides a new choice for aeroderivative gas turbine because the humidification process does not require high *** HAT cycle plants are all based on single-shaft gas turbines due to their simple structures,therefore converting aeroderivative three-shaft gas turbine into HAT cycle still lacks sufficient *** paper proposes a HAT cycle model on a basis of an aeroderivative three-shaft gas *** HAT cycle modelling of saturator,gas turbine and heat exchanger are carried out based on the modular modeling *** models are verified by simulations on the aeroderivative three-shaft gas *** results show that the studied gas turbine with original size and characteristics could not reach the original turbine inlet temperature because of the introduction of ***,the efficiency still increases by 0.16%when the HAT cycle runs at the designed power of the simple ***,simulations considering turbine modifications show that the efficiency could be significantly *** results obtained in the paper can provide reference for design and analysis of HAT cycle based on multi-shaft gas turbine especially the aeroderivative gas turbine.

摘要：通过多重mirNA触发的原位sirNA递送治疗策略可以有效提高对癌细胞的精确治疗.基于dNA纳米结构的可编程性、特异性分子识别、易于功能化修饰和良好生物相容性的特点,我们设计了一个3d dNA纳米治疗平台,用于实现双mirNA触发响应的sirNA原位递送.这种3d dNA纳米结构(TY1Y2)是由dNA四面体支架、两组Y型dNA(Y1和Y2)和EpCAM核酸适体通过自组装构建而成的.TY1Y2被特异性内化至靶标癌细胞后,能够被两个内源性mirNA(mir-21和mir-122)触发,从而产生强的荧光共振能量转移信号,用于双mirNAs成像.同时,治疗性的sirNA(siSurvivin和siBcl2)也可以通过链置换反应从TY1Y2中产生并进行原位释放,实现癌细胞的协同基因治疗.这种3d dNA纳米结构将内源性生物标记物的特异性成像和治疗性基因的原位递送整合为一个多功能纳米平台,在癌症诊断和治疗方面显示出广阔的应用前景.

摘要：Tandem electrocatalysis is an emerging concept for effective electrochemical CO_(2) reduction reaction(CO_(2)rr)towards multicarbons(C_(2+)).This decouples the multiple steps of CO_(2)-to-C_(2+)into two steps of CO_(2)-to-CO and CO-to-C_(2+)catalyzed by individual catalysts,to improve the Faradic efficiency(FE).However,due to the mass-transport limitation of CO from the generation site to the long-distance consumption site,such a strategy still remains challenge for high-rate production of C_(2+)***,we designed CuO/Ni single atoms tandem catalyst,which made the catalytic sites of Ni and Cu for independently catalyzing CO_(2)-to-CO and CO-to-C_(2+)compactly neighbored,enabling the in-situ generation and rapid consumption of *** CuO/Ni SAs tandem catalyst achieved a particularly high partial current density of C_(2+)products(1220.8 mA/cm^(2)),while still maintained outstanding C_(2+)products FE(81.4%)and excellent selectivities towards ethylene(FE 54.1%)and ethanol(FE 28.8%),enabling the profitable production of multicarbons by CO_(2)rr.