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High-Efficiency(Over 10%) Parallel Tandem Dye-Sensitized Solar Cells Based on Tri-Carbon Electrodes

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Transactions of Tianjin University 2022年第5期28卷 414-422页

作者： wu Shao Wenjun wu Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Shanghai Key Laboratory of Functional Materials ChemistryEast China University of Science and TechnologyShanghai 200237China

Ensuring high power conversion efficiency,partially or completely replacing Pt electrodes with inexpensive materials is one of the important development directions of dye-sensitized solar cells(DSSCs).In this work,we have developed a threecomponent(MWCNTs,carbon black and graphite) carbon(tri-carbon) electrode material for DSSC devices combined with the advantages of high electron transfer kinetics of MWCNTs,plentiful catalytic sites in crystal edges of carbon black and superior electrical conductivity and catalytic activity of *** a tri-carbon electrode,a Pt electrode,and two N719-sensitized photoanodes,a parallel tandem dye-sensitized solar cells are assembled obtaining a high PCE of 10.26%(V_(OC)=0.70 V,J_(SC)=19.99 mA/cm~2,FF=73.33%).It opens up a new avenue for the development of low-cost and highperformance DSSCs.

关键词： Dye-sensitized solar cells MWCNTs Carbon black Graphite Counter electrode

Exposing Cu-rich {110} active facets in PtCu nanostars for boosting electrochemical performance toward multiple liquid fuels electrooxidation

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Nano Research 2019年第5期12卷 1147-1153页

作者： Liping Huang Wei Zhang Peng Li Yongbo Song hongting Sheng Yuanxin Du Yang-Gang Wang Yuen wu Xun hong Yanhuai Ding Xiaoyou Yuan Manzhou Zhu Department of Chemistry and Center for Atomic Engineering of Advanced Materials Anhui UniversityHefei 230601China Department of Chemistry and Shenzhen Grubbs Institute Southern University of Science and TechnologyShenzhen 518055China Center of Advanced Nanocatalysis (CAN) and Department of Chemistry University of Science and Technology of ChinaHefei 230026China College of Civil Engineering & Mechanics Xiangtan UniversityXiangtan 411105China

In catalysis,tuning the structural composition of the metal alloy is known as an efficient way to optimize the catalytic *** work presents the synthesis of compositional segregated six-armed PtCu nanostars via a facile solvothermal method and their distinct composition-structure-dependent performances in electrooxidation *** alloy is shown to have a unique six arms with a Cu-rich dodecahedral core,mainly composed of {110} facets and exhibit superior catalytic activity toward alcohols electrooxidation compared to the hollow counterpart where Cu was selectively *** functional theory (DFT) calculations suggest that the formation of hydroxyl intermediate (OH^*) is crucial to detoxify CO poisoning during the electrooxidation *** addition of Cu is found to effectively adjust the d band location of the alloy catalyst and thus enhance the formation of ^*OH intermediate from water splitting,which decreases the coverage of ^*CO *** work demonstrates that the unique compositional anisotropy in alloy catalyst may boost their applications in electrocatalysis and provides a methodology for the design of this type catalyst.

关键词： element-specific etching crystal facet PtCu nanostars methanol oxidation

Simulation of Countercurrent Multi-Effect Drying System

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Advances in Materials Physics and Chemistry 2012年第4期2卷 206-211页

作者： hong Li Lianying wu Xianli wu Yangdong Hu Department of Chemical Engineering Ocean University of China Qingdao 266000 China

The paper bulids a countercurrent multi-effect drying process model which can be expressed as a linear programming(LP) problem with the minimum total energy consumption as target function. Based on the model it can be conventient to solve the heat load , degree of drying and other drying parameters of each effect. And it realizes the mathematical simulation an analysis of multi-effect drying process. Such process not only reuses the secondary steam but also utilizes the high energy grade. Drying silica sand using 1-effect drying to 5-effect drying is presented as an example. The energy consumption and energy saving rate are compared by using co-current multi-effect drying and countercurrent multi-effect drying. As a summary, the countercurrent multi-effect drying is better than co-current drying. Considered the equipment investment and energy conservation, the study also concluded that the countercurrent 4-effect drying is the optimum selection, and it can save 57.6% energy compared to countercurrent 1-effect drying.

关键词： Countercurrent Drying Multi-Effect Drying Secondary Steam LP

Bayesian optimization+XGBoost based life cycle carbon emission prediction for residential buildings—An example from Chengdu,China

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Building Simulation 2023年第8期16卷 1451-1466页

作者： Haize Pan Chengjin wu School of Civil Engineering and Geomatics Southwest Petroleum UniversityChengdu 610500China

The large amount of carbon emissions generated by buildings during their life cycle greatly impacts the environment and poses a considerable challenge to China’s carbon reduction *** building design phase has the most significant potential to reduce building life-cycle carbon emissions(LCCO_(2)).However,the lack of detailed inventory data at the design stage makes calculating a building’s LCCO_(2) very difficult and ***,accurate prediction of building LCCO_(2) at the design stage using relevant design factors is essential to reduce carbon *** paper proposes an ensemble learning algorithm combining Bayesian optimization and extreme gradient boosting(BO-XGBoost)to predict LCCO_(2) accurately in residential ***,this study collected and calculated the LCCO_(2) of 121 residential buildings in Chengdu,***,a carbon emission prediction model was developed using XGBoost based on 15 design factors,and hyperparameter optimization was performed using the BO ***,the model performance was evaluated using two evaluation metrics,coefficient of determination(R2)and root mean square error(RMSE),and the prediction performance of other models was compared with that of the BO-XGBoost *** results show that the RMSE of the proposed BO-XGBoost for predicting LCCO_(2) in residential buildings is at least 40%lower compared to other *** method adopted in this study can help designers accurately predict building LCCO_(2) at the early design stage and provide methodological support for similar studies in the future.

关键词： building carbon emissions life cycle XGBoost Bayesian optimization predictive model

Energy-Based Collaborative Spectrum Sensing for Cognitive UWB Impulse Radio

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Journal of Electronic Science and Technology 2015年第2期13卷 174-180页

作者： Wei-Chiang wu Chun-Te wu Department of Electrical Engineering Da-Yeh University

This paper focuses on the issue of collaborative spectrum sensing in cognitive ultra wideband（CUWB） impulse radio. We employ energy-based signal detection method and apply the Neyman-Pearson（NP） decision rule to determine the optimum threshold. Two cooperative spectrum sensing schemes are developed in this paper. The decision fusion scheme is based on hard decision, in which each cooperating cognitive user（CU） sends its own local decision to the fusion center（FC）. The FC then makes a final decision according to the majority voting rule. Alternatively, the data fusion scheme is based on soft decision, in which each local CU sends its observed value directly to the FC. The FC combines these values, compares to a threshold and then makes the final decision. The performances of both schemes are studied by using analytical tools and computer simulations. The receiver operating characteristics（ROC）, which reveal the probability of detection versus false-alarm curve, are employed to evaluate the system performance under different scenarios. Simulation results demonstrate that the data fusion scheme outperforms the decision fusion scheme and verify that the collaborative spectrum sensing has practical importance in CUWB networks.

关键词： Impulse collaborative false Spectrum wideband alarm apply receiver verify scenarios

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L-拓扑空间中的*-拟仿紧性

山东大学学报（理学版） 2008年第8期43卷 38-41,45页

作者：刘红平孟广武聊城大学数学科学学院山东聊城252059

利用α-正则闭远域族在L-拓扑空间中定义了一种新的仿紧性,即*-拟仿紧性,并用半内部对其进行了刻划。研究了*-拟仿紧性所具有的一些性质,比如L-good extension,正则闭遗传,弱同胚不变性。讨论了*-拟仿紧空间的半正则化以及*-拟仿紧性在... 详细信息

利用α-正则闭远域族在L-拓扑空间中定义了一种新的仿紧性,即*-拟仿紧性,并用半内部对其进行了刻划。研究了*-拟仿紧性所具有的一些性质,比如L-good extension,正则闭遗传,弱同胚不变性。讨论了*-拟仿紧空间的半正则化以及*-拟仿紧性在诱导空间中的重要性质。

关键词： L-拓扑空间 α-正则闭远域 *-拟仿紧性诱导空间

On-demand synthesis of high-quality,blue-light-active ZnSe colloidal quantum wires

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National Science Review 2022年第10期9卷 137-146页

作者： Yi Li Chong Zhang Jie Tian Liang wu Guo-Qiang Liu Hui-Hui Li Yu-Zhuo Zhang Zhen-Chao Shao Zhen He Shu-hong Yu Department of Chemistry Institute of Biomimetic Materials and Chemistry Anhui Engineering Laboratory of Biomimetic Materials Division of Nanomaterials and Chemistry Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Engineering and Materials Science Experiment Center University of Science and Technology of China

Beyond the state-of-the-art Cd-containing quantum wires(QWs),heavy-metal-free semiconductor QWs,such as ZnSe,are of great interest for next-generation environmental-benign ***,simultaneous,on-demand manipulation of their radial and axial sizes—that allows strong quantum confinement in the blue-light region—has so far been *** we present a two-step catalyzed growth strategy that enables independent,high-precision and wide-range controls over the diameter and length of ZnSe *** find that a new epitaxial orientation between the cubic-phase Ag2Se solid catalyst and wurtzite ZnSe QWs kinetically favors the formation of defect-free ultrathin *** to their high uniformity,the resulting blue-light-active,phase-pure ZnSe QWs exhibit well-defined excitonic absorption with the 1Se-1Shtransition linewidth as narrow as sub-13 *** the transient absorption spectroscopy,we further show that surface electron traps in these ZnSe QWs can be eliminated by thiol passivation,which results in long-lived charge carriers and high-efficiency solar-to-hydrogen conversion.

关键词： zinc selenide colloidal synthesis quantum wires heavy-metal-free solar conversion

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防突揭煤设计研究——以某高速铁路项目为例

科学技术创新 2025年第1期 190-193页

作者：仵彦波中铁二十局集团第四工程有限公司山东青岛

为了保障高速铁路施工安全,防止瓦斯突出事故,本文详细介绍了该段防突揭煤的流程设计。通过分析超前预测预报技术、瓦斯监控与通风系统以及支护结构调整措施,提出了针对性的防突策略。研究结果表明,通过科学的防突设计和有效的监控管理... 详细信息

为了保障高速铁路施工安全,防止瓦斯突出事故,本文详细介绍了该段防突揭煤的流程设计。通过分析超前预测预报技术、瓦斯监控与通风系统以及支护结构调整措施,提出了针对性的防突策略。研究结果表明,通过科学的防突设计和有效的监控管理,能够显著降低瓦斯突出风险,确保隧道施工的顺利进行。本文的研究成果对类似工程具有参考价值。

关键词：防突揭煤设计高速铁路

Deposition Technology and Microhardness of Electrochemical Deposited Ni- W Alloy Nanocrystalline

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材料热处理学报 2004年第05B期25卷 1279-1282页

作者： wuYu-cheng SHUXia WANGLi-ping HUXiao-ye WANGWen-fang HUANGXin-min FacultyofMaterialsScienceandEngineeringHefeiUniversityofTechnology 230009HefeiP.R.China

In this paper, a perpendicular experiment was conducted by using 4 key process parameters, such as concentration of sodium tungstate, current density, PH value and operating temperature, which have obvious influence on the electrodeposition of Ni-W alloy nanocrystalline. By extreme difference analysis, the influence of multi-factors on the deposition rate and microhardness and surface quality of the nanocrystalline alloy coatings was studied in detail. By further contrastive experiment, the influence of single-factor on the electrodeposition of Ni-W alloy nanocrystalline was also discussed, which will provide basis for the preparation of Ni-W alloy nanocrystalline.

关键词：显微硬度电泳沉积 Ni-W合金毫微结晶