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Photocatalytic water splitting of ternary graphene-like photocatalyst for the photocatalytic hydrogen production

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Frontiers of Environmental Science & Engineering 2020年第4期14卷 159-171页

作者： Yan Zhang Yuyan Zhang Xue Li Xiaohan Zhao Cosmos Anning John Crittenden xianjun lyu School of Chemical an d Environmental Engineering Shandong University of Science and TechnologyQingdao 266000China School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlantaGA 30332-0595USA

In recent times,there has been an increasing demand for energy which has resulted in an increased consumption of fossil fuels thereby posing a number of challenges to the *** the course finding possible solutions to this environmental canker,solar photocatalytic water splitting to produce hydrogen gas has been identified as one of the most promising methods for generating renewable *** retard the recombination of photogenerated carriers and improve the efficiency of photocatalysis,the present paper reports a facile method called the hydrothermal method,which wa s used to prepare ternary graphene-like photocatalyst.A“Design Expert”was used to investigate the influence of the loading weight of Mo and GO as well as the temperature of hydrothermal reaction and their interactions on the evolution of hydrogen(H 2)in 4 *** experimental results showed that the ternary graphene-like photocatalyst has a strong photocatalytic hydrogen production activity compared to that of pure *** particular,the catalyst added 2.5 wt%of GO weight yielded the highest quantum of 21.69%at 400-700 nm of *** optimal evolution H2 in 4 h conditions was obtained as follows:The loading weight of Mo was 8.19 wt%,the loading weight of GO was 2.02 wt%,the temperature of the hydrothermal reaction was 200.93℃.Under the optimum conditions,the evolution of H2 in 4h could reach 4.2030 mL.

关键词： Water splitting Visible light Graphene-like photocatalyst Response surface methodology

头颈鳞癌颈部转移淋巴结包绕颈动脉的外科处理策略

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中华耳鼻咽喉头颈外科杂志 2024年第8期59卷 850-856页

作者：张海东龚单春孙凯王昊周丽娟闫云飞刘凯吕献军于振坤东南大学医学院临床医学院南京210096 南京医科大学附属明基医院耳鼻咽喉头颈外科南京210019 南京咽喉头颈肿瘤重点实验室南京210019 南京医科大学临床医学院南京211166 南京医科大学附属明基医院介入科南京210019

目的探讨头颈鳞状细胞癌的颈部转移淋巴结包绕颈动脉的手术干预策略。方法回顾性分析2019年6月至2023年12月,南京医科大学附属明基医院耳鼻咽喉头颈外科收治的62例病变包绕颈动脉的晚期头颈肿瘤患者资料,其中原发灶未见复发或原发灶不... 详细信息

目的探讨头颈鳞状细胞癌的颈部转移淋巴结包绕颈动脉的手术干预策略。方法回顾性分析2019年6月至2023年12月,南京医科大学附属明基医院耳鼻咽喉头颈外科收治的62例病变包绕颈动脉的晚期头颈肿瘤患者资料,其中原发灶未见复发或原发灶不明的颈部淋巴结转移性鳞状细胞癌患者9例,均为男性,年龄48~79岁。患者的体力状态(performance status,PS)评分均在2级及以下,影像学诊断颈总动脉和/或颈内动脉均被肿瘤包绕≥270°。本组患者均予覆膜支架动脉内置入+颈部淋巴结转移癌根治性切除术。总结覆膜支架动脉内置入的成功率和并发症、手术相关并发症、局部复发率、患者生存质量及总生存率。患者生存质量采用配对秩和检验进行对比分析,总生存率采用Kaplan-Meier进行分析。结果覆膜支架置入成功率100%,无支架置入并发症。手术R0切除8例,R1切除1例。术后患者生存质量提高,在“疼痛”“情绪”“焦虑”方面改善的差异有统计学意义(Z值分别为-2.236、-2.460、-2.200,P值均<0.05)。随访1~18个月,中位随访时间为7个月;1例患者失访,3例出现局部复发,发生率为37.5%(3/8)。患者的12个月生存率为59.9%。结论覆膜支架动脉内置入+颈部淋巴结转移癌根治性切除术是一种治疗颈部淋巴结转移癌的有效方式。

关键词：癌,鳞状细胞颈部淋巴结转移颈动脉受累覆膜支架生存质量局部复发

Effects of Solution Chemistry Conditions and Adsorbent Surface Properties on Adsorption of Ni(Ⅱ) on Laiyang Bentonite

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China Petroleum Processing & Petrochemical Technology 2016年第3期18卷 66-75页

作者： Cao Xiaoqiang Yan Bingqi Xue Jianliang Wang Qian Wang Yaping Huang Yongqing Zhang Yan lyu xianjun College of Chemical and Environmental Engineering Shandong University of Science and Technology Qingdao 266590

The effects of solution chemistry conditions and adsorbent surface properties on the adsorption of Ni(II) on Laiyang bentonite were investigated via the batch technique. Potentiometric and mass titration techniques were employed in the batch experimental methods, and the results showed that the point of zero net proton charge(PZNPC) of bentonite at different ionic strength denoted p HPZNPC to be 8.2±0.1. The removal of Ni(II) from the solution increased with an increasing bentonite dosage, with the maximum removal efficiency equating up to 99%. The adsorption of Ni(II) on bentonite increased with an increasing p H value at a p H value of 99% at a p H value of >10.2. The Ni(II) adsorption performance exhibited different responses to cations(K+, Na+) but was not influenced by the background anions(NO3-, Cl-, and Cl O4-). The adsorption of Ni(II) was dominated by the outer-sphere surface complexation and ion exchange with Na+/H+ on bentonite surface at low p H value, whereas the inner-sphere surface complexation and surface precipitation were the main adsorption mechanisms at high p H value. The adsorption isotherms of Ni(II) on bentonite can be described well by the Langmuir model. The thermodynamic parameters of adsorption, including the Gibbs free energy, the enthalpy change, and the entropy change, at different temperatures indicated that the adsorption of Ni(II) on bentonite was endothermic and spontaneous.

关键词： nickel surface properties adsorption waste catalyst bentonite

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碱渣-矿渣基胶凝材料的制备及水化特性研究

中国矿业大学学报 2022年第4期51卷 802-811页

作者：吴蓬王强刘庆吕宪俊山东科技大学化学与生物工程学院山东青岛266590

为了探索碱渣在碱激发矿渣胶凝材料中大宗利用的可行性,以硅酸盐水泥熟料和硬石膏为激发剂,制备出达到32.5 R复合硅酸盐水泥抗压强度等级的碱渣-矿渣基复合胶凝材料.采用X射线衍射(XRD)、热重(TG)和扫描电子显微镜(SEM)对材料的水化产... 详细信息

为了探索碱渣在碱激发矿渣胶凝材料中大宗利用的可行性,以硅酸盐水泥熟料和硬石膏为激发剂,制备出达到32.5 R复合硅酸盐水泥抗压强度等级的碱渣-矿渣基复合胶凝材料.采用X射线衍射(XRD)、热重(TG)和扫描电子显微镜(SEM)对材料的水化产物和微观特征进行研究.结果表明:该材料的水化产物主要为水化硅酸钙(CSH)凝胶、针棒交织状钙矾石(AFt)、片层交织状Friedel’s盐(Fs),AFt和Fs发挥骨架支撑作用,CSH凝胶将骨架与未水化反应颗粒黏结在一起,同时填充在水化产物空隙中.胶凝材料宏观抗压强度主要与250℃以下水化产物分解所引起的失重率成正相关,失重率越大,抗压强度越高.

关键词：碱渣矿渣激发剂抗压强度水化产物

Estimation of tunnel axial orientation in the interlayered rock mass using a comprehensive algorithm

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第7期16卷 2579-2590页

作者： Hui Li Weizhong Chen xianjun Tan State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

The axial selection of tunnels constructed in the interlayered soft-hard rock mass affects the stability and safety during *** optimization is primarily based on experience or comparison and selection of alternative values under specific geological *** this work,an intelligent optimization framework has been proposed by combining numerical analysis,machine learning(ML)and optimization *** automatic and intelligent numerical analysis process was proposed and coded to reduce redundant manual *** conventional optimization algorithm was developed from two aspects and applied to the hyperparameters estimation of the support vector machine(SVM)model and the axial orientation optimization of the ***,the comprehensive framework was applied to a numerical case study,and the results were compared with those of other *** results of this study indicate that the determination coefficients between the predicted and the numerical stability evaluation indices(STIs)on the training and testing datasets are 0.998 and 0.997,*** a given geological condition,the STI that changes with the axial orientation shows the trend of first decreasing and then increasing,and the optimal tunnel axial orientation is estimated to be 87.This method provides an alternative and quick approach to the overall design of the tunnels.

关键词： Tunnel Building information modeling Design optimization Particle swarm optimization Support vector machine(SVM)

A new centrality measure based on neighbor loop structure for network dismantling

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Digital Communications and Networks 2024年第2期10卷 472-480页

作者： Qingxia Liu Bang Wang Jiming Qi xianjun Deng School of Electronic Information and Communications Huazhong University of Science and TechnologyWuhan430074China School of Cyber Science and Engineering Huazhong University of Science and TechnologyWuhan430074China

Nearly all real-world networks are complex networks and usually are in danger of ***,it is crucial to exploit and understand the mechanisms of network attacks and provide better protection for network *** dismantling aims to find the smallest set of nodes such that after their removal the network is broken into connected components of sub-extensive *** overcome the limitations and drawbacks of existing network dismantling methods,this paper focuses on network dismantling problem and proposes a neighbor-loop structure based centrality metric,NL,which achieves a balance between computational efficiency and evaluation *** addition,we design a novel method combining NL-based nodes-removing,greedy tree-breaking and ***,we compare five baseline methods with our algorithm on ten widely used real-world networks and three types of model networks including Erd€os-Renyi random networks,Watts-Strogatz smallworld networks and Barabasi-Albert scale-free networks with different network generation *** results demonstrate that our proposed method outperforms most peer methods by obtaining a minimal set of targeted attack ***,the insights gained from this study may be of assistance to future practical research into real-world networks.

关键词： Complex networks Network dismantling Centrality measure

Breaking the geometry-performance tradeoff in compressor deviation modeling:Nested principal component analysis

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Chinese Journal of Aeronautics 2024年第9期37卷 131-149页

作者： Mingzhi LI xianjun YU Dejun MENG Guangfeng AN Baojie LIU Research Institute of Aero-Engine Beihang UniversityBeijing 100191China National Key Laboratory of Science&Technology on Aero-Engine Aero-Thermodynamics Beihang UniversityBeijing 100191China AECC Shenyang Engine Research Institute Shenyang 110015China

Uncertainties in the aerodynamic performance of compressors,introduced by manufac-turing variations,have received more and more attentions in recent *** deviation model plays a crucial role in evaluating this uncertainty and facilitating robust ***,current deviation models with a few variables cannot simultaneously achieve a precise geometric approxi-mation of deviation and provide an accurate assessment of performance *** paper introduces a novel deviation modeling method named Nested Principal Component Analysis(NPCA)to break this *** this method,both geometry-based and performance-based modes are utilized to describe manufacturing *** considering aerodynamic sensitivity,surface deformations that significantly impact aerodynamic performance can be extracted for deviation *** demonstrate the superiority of this newly proposed method,ninety-eight newly man-ufactured compressor rotor blades were measured using a coordinate measurement machine,and both NPCA and Principal Component Analysis(PCA)were employed to model the real manufac-turing *** results indicate that,in comparison to the PCA method,the NPCA method achieves an equivalent level of accuracy in geometric reconstruction and evaluation of mean ***,the same level of accuracy can be obtained with eight NPCA modes and fifty PCA modes when assessing the scatter in aerodynamic ***,the working mecha-nism of the NPCA method for accurate uncertainty quantification was further investigated.

关键词： Manufacturing variation Uncertainty quantification Dimension reduction Aerodynamics Flow mechanism

Development of a deviation package method for low-cost robust optimization in compressor blade design

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Chinese Journal of Aeronautics 2024年第4期37卷 166-180页

Manufacture variations can greatly increase the performance variability of compressor blades. Current robust design optimization methods have a critical role in reducing the adverse impact of the variations, but can be affected by errors if the assumptions of the deviation models and distribution parameters are inaccurate. A new approach for robust design optimization without the employment of the deviation models is proposed. The deviation package method and the interval estimation method are exploited in this new approach. Simultaneously, a stratified strategy is used to reduce the computational cost and assure the optimization accuracy. The test case employed for this study is a typical transonic compressor blade profile, which resembles most of the manufacture features of modern compressor blades. A set of 96 newly manufactured blades was measured using a coordinate measurement machine to obtain the manufacture variations and produce a deviation package. The optimization results show that the scatter of the aerodynamic performance for the optimal robust design is 20% less than the baseline value. By comparing the optimization results obtained from the deviation package method with those obtained from widely-used methods employing the deviation model, the efficiency and accuracy of the deviation package method are demonstrated. Finally, the physical mechanisms that control the robustness of different designs were further investigated, and some statistical laws of robust design were extracted.

关键词： Manufacture variations Robust design optimization Compressor leading edge Aerodynamics Physical mechanism

Understanding Surface Water-Groundwater Conversion Relationship and Associated Hydrogeochemistry Evolution in the Upper Reaches of Luan River Basin, North China

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Journal of Earth Science 2024年第3期35卷 1010-1023页

作者： Le Zhao Chunli Su Wenbo Liu xianjun Xie School of Environmental Studies China University of GeosciencesWuhan 430078China State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution Ministry of Ecology and EnvironmentWuhan 430078China China Geological Environmental Monitoring Institute Beijing 100081China

Luan River is the main water source in Beijing-Tianjin-Hebei region,northern China,where the groundwater system is vulnerable and pollution issue is *** is significant for regional groundwater resources protection to identify the hydrogeochemistry evolution and affecting factors along flow direction occurred in the upper reaches,especially the surface water-groundwater(SWGW)conversion *** this study,recharge,conversion and geochemistry evolution of SW and GW were elucidated based on physical-hydrochemical indicators and stable isotopes in 36 GW samples and 20 SW samples,which were collected in July 2019 and July *** factor analysis was further utilized to determine the main factors responsible for regional hydrogeochemical *** indicate that GW recharged SW in plateau area,and SW and GW recharged each other in typical Alpine valley *** hydrochemical types are HCO3-Ca·Mg and HCO3-Ca,and the hydrochemical evolution is dominated by weathering of silicate and carbonate *** cation exchange adsorption has minor impact on groundwater *** rise of SO42-and NO3-contents in groundwater is related to industrial and agricultural *** main controlling factors of SW hydrochemical components included recharge from groundwater,industrial and mining activities,explaining 90.04%of data ***,water-rock interaction,agricultural and domestic sewage are responsible for GW quality,accounting for 83.38%.

关键词： groundwater water sources conversion relationship hydrogeochemical characteristics evolutional processes water-rock interaction factor analysis Luan River Basin.