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Application of modified cerium dioxide for photocatalytic air pollution purification

Rare Metals 2024年第11期43卷 5473-5486页

作者： Cheng-Zhang Zhu qi-hang tian Bing-Han Wang Mu-Tao Xu qi-Jie Jin Zi-Ye Zhang Shu-Kun Le Yang Wu Yue-Chang Wei Hai-Tao Xu School of Environmental Science and Engineering Nanjing Tech UniversityNanjing 210009China Inner Mongolia Key Laboratory of High-Value Functional Utilization of Low Rank Carbon Resources Chemical Engineering CollegeInner Mongolia University of TechnologyHohhot 010050China National Observation and Research Station of Coastal Ecological Environments in Macao Macao Environmental Research InstituteMacao University of Science and TechnologyMacao SAR 999078China State Key Laboratory of Heavy Oil Processing Key Laboratory of Optical Detection Technology for Oil and GasChina University of PetroleumBeijing 102249China

Cerium dioxide(CeO_(2))is a significant rare earth oxide with the merits of rich oxygen defects,specific4f^(1)5d^(1)orbitals,and superior oxygen storage-release capacity in Ce^(4+)/Ce^(3+)reversibility pairs,and has been widely investigated as an active photocatalytic material for air pollution *** enhance the photocatalytic efficiency of CeO_(2),recent developments of numerous modification strategies have been employed to broaden the light absorption range and reduce the recombination rate of electron-hole *** review summarizes the fabrication of modified CeO_(2)catalysts,including metal or nonmetal doping,heterostructure construction and oxygen vacancy manufacturing,to provide insight into how those advanced techniques improve the photocatalytic ***,this work provides a detailed discussion on the usage of modified CeO_(2)in the fields of air pollution control,including nitrogen oxides removal,volatile organic compounds elimination and the purification of carbon ***,the potential future development and further research on the modification of CeO_(2)has been identified.

关键词： Cerium dioxide Element-doping Heterojunction Air pollution purification Photocatalytic activity

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Distribution and mapping of temperate savanna in the sandy lands of eastern China

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Science China Earth Sciences 2025年第1期68卷 128-141页

作者： Xiaoya LI Feng WANG Tao DUAN Kaijie YANG Bin YANG Chunmei WANG Xin tian qi LU Institute of Ecological Conservation and Restoration Institute of Desertification Studies Chinese Academy of Forestry Institute of Desertification Institute of Desertification Studies Chinese Academy of Forestry Institute of Great Green Wall Satellite Application Centre for Ecology and Environment MEE Institute of Microelectronics Chinese Academy of Sciences Aerospace Information Research Institute Chinese Academy of Sciences Institute of Forest Resource Information Techniques Chinese Academy of Forestry

Savannas are distributed globally across various *** perform a significant socioeconomic role in regulating net primary productivity and the terrestrial carbon *** to the high spatial heterogeneity induced by the mixed distribution of trees and grasses,current global land-cover classification maps often classify savannas as forests or grasslands Temperate savannas in China cover a vast area,yet their spatial patterns and extent remain poorly *** study developed a novel remote sensing temperate savannas mapping method by integrating very high-resolution （VHR） unmanned aerial vehicle （UAV） and GF-6 satellite imagery based on the vegetation structure characteristics of temperate savannas using the FAO definition of *** and validation datasets were collected from VHR UAV imagery covering the main temperate savannah types with a ground area of 1818 *** fractional woody vegetation cover （FWVC） and fractional herbaceous vegetation cover （FHVC） in temperate savannas were estimated by integrating Classification and Regression Tree and Random Forest *** current distribution of temperate savannas in the Horqin and Otindag Sandy Lands of Eastern China was mapped to a unit area of 0.5 *** root-mean-square error （RMSE） values for the FWVC and FHVC models were 10.69% and 11.67%,and the R2values were 0.66 and 0.63,*** assessment indicated that the new temperate savanna map had high identification accuracy,with a Kappa coefficient of 0.70,overall accuracy of 0.88,and average accuracy of *** savannas in the sandy lands of eastern China were primarily distributed in the northern Horqin Sandy Land the central and eastern regions of the Otindag Sandy Land,and the transition zone from the southern slopes of the Greater Khingan Mountains to the plains,covering a total area of 3.27×10～6 *** main savannah types were elm,oak/maple,and shrub *** savannas were widely distributed in the Otindag Sandy

关键词： Temperate savanna UAV imagery GF-6 Fractional woody vegetation cover Fractional herbaceous vegetation cover Machine learning

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通过正离子聚合原位制备聚谷氨酸苄酯-g-(聚四氢呋喃-b-聚异丁烯)/银纳米复合材料及其性能研究

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高分子学报 2018年第4期28卷 464-474页

作者：魏梦娟章琦张航天吴一弦北京化工大学化工资源有效利用国家重点实验室生物医用材料北京实验室北京100029

采用烯丙基溴官能化聚异丁烯/高氯酸银体系引发四氢呋喃活性正离子聚合制备聚谷氨酸苄酯-g-(聚四氢呋喃-b-聚异丁烯)/银纳米复合材料(PBLG-g-(PTHF-b-PIB)/Ag).研究接枝密度对该纳米复合材料表面组成、形貌及自组装行为的影响,进一步探... 详细信息

采用烯丙基溴官能化聚异丁烯/高氯酸银体系引发四氢呋喃活性正离子聚合制备聚谷氨酸苄酯-g-(聚四氢呋喃-b-聚异丁烯)/银纳米复合材料(PBLG-g-(PTHF-b-PIB)/Ag).研究接枝密度对该纳米复合材料表面组成、形貌及自组装行为的影响,进一步探究纳米复合材料中银的含量、分布、晶型及存在形态,以布洛芬(IBU)作为模拟药物,研究接枝共聚物中接枝密度和平均支链长度对纳米复合材料载药释药行为的影响,通过抑菌圈法和MTT法研究纳米复合材料的抗菌性和细胞毒性.结果表明:通过烯丙基溴官能化聚异丁烯大分子引发四氢呋喃活性正离子开环聚合,可以原位制备不同接枝密度和不同平均支链长度的PBLG-g-(PTHF-b-PIB)/Ag纳米复合材料,其中银的质量含量在0.25%~3.9%之间,与其理论含量基本相吻合,银颗粒以聚集体形态存在,尺寸为5~10 nm,晶型为面心立方结构;该纳米复合材料在四氢呋喃/正己烷(4/1,V/V)混合介质中自组装形成胶束,胶束数目随接枝密度增加而减少,但尺寸增大;随接枝共聚物中接枝密度和纳米银含量增加,纳米复合材料的疏水性增加;随接枝共聚物中接枝密度增加,纳米复合材料表面形貌可由球形结构逐渐转化为双连续相结构;纳米复合材料的载药微球可以通过接枝共聚物中主链PBLG的空心螺旋结构、酰胺键及PTHF支链的醚键结构显示三重载药特性,载药量和累积释药量均随着接枝共聚物中接枝密度或PTHF链段长度增加而增加,且在37oC下的释药率是25oC下释药率的3倍左右.该纳米复合材料的抗菌性能随纳米银含量增加而增加,当纳米银含量为1.48%时,该纳米复合材料1周后细胞存活率为97.7%,即无细胞毒性.

关键词：正离子聚合聚谷氨酸苄酯-g-(聚四氢呋喃-b-聚异丁烯) 嵌段接枝共聚物复合材料抗菌

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Constructing 2D bismuth-based heterostructure for highly efficient photocatalytic CO2 reduction

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Tungsten 2025年第1期7卷 71-79页

作者： Ruo-hang Xu Hao-Yu Jiang Dan-Dan Cui Kun-Rong Du Hong-Run Zhang Sheng-Jie Xu Ya-qi Li Zhi-Zhen Ren Liang Wang Wei-Chang Hao Yi Du School of Physics and BUAA-UOW Joint Research Centre Beihang University Shenzhen Institute of Beihang University Centre for Catalysis and Clean Energy School of Environment and Science Griffith University

Reforming carbon dioxide（CO2） into fuels and valuable chemicals using solar energy holds significant potential for emission reduction and addressing energy supply *** recombination of photocarriers remains a major obstacle,however,to enhancing solar energy conversion efficiency in the photocatalytic reaction *** two-dimensional materials,constructing heterogeneous structures has emerged as an effective strategy to enhance the separation of photoexcited carriers by leveraging the internal electric field at the heterogeneous ***,we present a facile strategy for preparing Bi4NbO8Br/Bi2WO6plate-on-plate Z-scheme junctions with a strong internal electric field by in situ *** unique heterostructure facilitates efficient separation and transport of photoexcited charges by harnessing the internal electric field induced by chemical bonding at the lateral ***,the Bi4NbO8Br/Bi2WO6heterostructure exhibits enhanced CO2photoreduction properties,along with a CO yield rate of approximately 35 μmol·g-1·h-1under full light *** work offers novel insights into the synthesis of unique hetero structures intended to enhance the efficiency of photocatalytic CO2reduction.

关键词： Bi4NbO8Br/Bi2WO6 CO2 reduction Heterostructures Photocatalysts

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嘉陵江大桥桥区河段通航水流条件试验研究

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水科学与工程技术 2017年第3期 87-90页

作者：徐启航田进重庆交通大学重庆400074

以重庆市蔡家嘉陵江大桥桥区河段物理模型试验为基础,分析了桥区河段的河床演变,同时研究了桥梁间距、桥跨布置及主墩型式对桥区通航水流条件的影响。结果表明:从通航角度而言,桥梁通航孔跨度越大对通航安全影响越小,但桥跨过大则经济性... 详细信息

以重庆市蔡家嘉陵江大桥桥区河段物理模型试验为基础,分析了桥区河段的河床演变,同时研究了桥梁间距、桥跨布置及主墩型式对桥区通航水流条件的影响。结果表明:从通航角度而言,桥梁通航孔跨度越大对通航安全影响越小,但桥跨过大则经济性差,结构不安全,接线要求更高。在综合考虑模型试验、桥梁结构要求和两岸接线等因素的前提下,尽量加大桥梁跨度,保障桥区通航安全。

关键词：桥区河段通航条件模型试验

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Staged dendrite suppression for high safe and stable lithium-sulfur batteries

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Journal of Energy Chemistry 2025年第1期100卷 674-683页

作者： Jun Jiang Zhenjie Lu Yanwen Ding Shujun Liu Zhijie qi tian Tang Yunfan Zhang Zhiyuan Ma Jingwen Sun Liang Xue Wenyao Zhang Pan Xiong Xin Wang Junwu Zhu Yongsheng Fu Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education Nanjing University of Science and Technology Jiangsu Pylon Battery Co.Ltd

The unavoidable dendrite growth and shuttle effect have long been stranglehold challenges limiting the safety and practicality of lithium-sulfur ***,we propose a dual-action strategy to address the lithium dendrite issue in stages by constructing a multifunctional surface-negatively-charged nanodiamond layer with high ductility and robust puncture resistance on polypropylene （PP） *** uniformly loaded compact negative layer can not only significantly enhance electron transmission efficiency and promote uniform lithium deposition,but also reduce the formation of dendrite during early deposition *** importantly,under the strong puncture stress encountered during the deterioration of lithium dendrite growth under limiting current,the high ductility and robust puncture resistance（145.88 MPa） of as-obtained nanodiamond layer can effectively prevent short circuits caused by unavoidable lithium *** Li||Li symmetrical cells assembled with nanodiamond layer modified PP demonstrated a stable cycle of over 1000 h at 2 mA cm-2with a polarization voltage of only 29.3 ***,the negative charged layer serves as a physical barrier blocking lithium polysulfide ions,effectively mitigating capacity *** improved cells achieved a capacity decay of only 0.042%per cycle after 700 cycles at 3 C,demonstrating effective suppression of dendrite growth and capacity attenuation,showing promising prospect.

关键词： Ductility

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Pulp health and calcific healing of a complicated crown–root fracture with additional root fracture in a maxillary incisor: A case report

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World Journal of Clinical Cases 2025年第3期13卷 42-49页

作者： Na Li Yue-Yue Ren Ying Tang qi Yang tian-tian Meng Song Li Jing Zhang Stomatological Hospital and College Anhui Medical UniversityHefei 230032Anhui ProvinceChina Department of Endodontics The Affiliated Stomatological Hospital of Xuzhou Medical UniversityXuzhou 221000Jiangsu ProvinceChina

BACKGROUND Complicated crown–root fracture (CRF) involves severe injury to the crown, root,and pulp, and may be accompanied by multiple root fractures. The loss of a toothhas lifelong consequences for children and teenagers, but the maintenance of pulphealth and the calcific healing of multiple root fractures are rarely reported in *** SUMMARY This case reports healing of a permanent tooth with complicated crown–root andadditional root fractures, in which pulp health was maintained. A 10-year-old girlfell and fractured the root of her maxillary left central incisor at the cervical *** the coronal fragment was repositioned, the tooth was splinted until thetooth was no longer mobile, 2 years later. Eight years after treatment, the toothhas remained asymptomatic with vital pulp and localized gingival ***-beam computed tomography revealed not only calcified healing of the CRFbut also spontaneous healing in an additional undiagnosed root fracture. Thefracture line on the enamel could not be healed by hard tissue and formed agroove in the cervical crown. It was speculated that the groove was related to thelocalized gingival *** This case provides a clinical perspective of the treatment of a tooth with acomplicated CRF and an additional root fracture.

关键词： Complicated crown-root fracture Multiple root fracture Spontaneous healing Cone-beam computed tomography Long-term follow-up Case report

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Deliberate design of MOF-based pre-catalyst rationalizing the structural reconstruction toward efficient oxygen evolution reaction

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Science China Chemistry 2025年

作者： Yunhui Chen Meng tian Zhongqi Zhang Guangzhao Wang Yan Guo Jing Wu Dawei qi Zhenhua Yan Xiangyu Liu Xi Liu State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia University Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology of Chongqing School of Electronic Information Engineering Yangtze Normal University Frontiers Science Center for New Organic Matter Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) State Key Laboratory of Advanced Chemical Power Sources College of Chemistry Nankai University School of Chemistry and Chemical Engineering In-situ Center for Physical Sciences Frontiers Science Center for Transformative Molecules Shanghai Jiao Tong University

Metal-organic frameworks （MOFs）,that have emerged as promising electrocatalysts in oxygen evolution reaction （OER）,usually undergo structural reconstruction to form metal hydroxides as active ***,it remains a great challenge to design and synthesize ideal MOF-based pre-catalysts for properly cognizing and utilizing the reconstruction process toward efficient OER ***,the well-defined MOF-808 is post-modified by 2-hydroxyphosphonoacetic acid （HPAA） to form a micro-adsorber that enables to capture of metal ions ***3+and Ni2+ions are synergistically anchored into the microadsorber,developing a Fe/Ni-containing pre-catalyst that can be dynamically electrooxidized to be an active and stable dual-site electrocatalyst denoted by R-MOF-HPAA@FeNi with abundant metal *** a result,R-MOF-HPAA@FeNi exhibits an excellent OER performance with a low overpotential of 272 mV and Tafel slope of 35.9 m V dec-1,as well as long-term stability over 300 h at 10 m A *** and theoretical calculations suggest the resulting catalyst mainly follows a lattice oxygen mechanism （LOM） of dual-metal-site mechanism （DMSM）.Owing to the chelating role of HPAA,the post-synthesized MOF-HPAA behaves as a trap to uniformly and firmly adhere Fe3+and Ni2+ions,leading to a functionalized MOF-based pre-catalyst which can be structurally evolved into atomic level-distributed OER electrocatalysts.

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教育博士招生制度的现状、困境与出路

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黑龙江高教研究 2025年第1期43卷 98-103页

作者：韦卫起航李祥贵州交通职业大学贵州贵阳551400 西北师范大学甘肃兰州730070 贵州师范大学贵州贵阳550025

教育博士高质量发展是教育强国的战略机遇和教育博士招生规模扩大的时代诉求,完善教育博士招生制度是把好教育博士人才培养“入口关”的重要问题,是提升教育博士人才培养质量的开端。基于2024年31所高校教育博士的招生文本分析可以发现... 详细信息

教育博士高质量发展是教育强国的战略机遇和教育博士招生规模扩大的时代诉求,完善教育博士招生制度是把好教育博士人才培养“入口关”的重要问题,是提升教育博士人才培养质量的开端。基于2024年31所高校教育博士的招生文本分析可以发现,当前教育博士招生制度设计从实质正义和程序公平两个方面体现正义属性,但还存在选拔标准学博趋同、招生指标分配不均、类型特征不够凸显等问题。教育博士招生制度改革,要扣准教育博士类别要求和人才规格定位,从选拔标准应差异化、招生指标应动态化、评价标准应科学化等方面,进一步回应满足面向2035的卓越教师和教育家型教师培养需要。

关键词：教育博士招生制度程序公平实质正义内容分析法

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Cloud Det ection Using Super Pixel Classification and Semantic Segmentation

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Journal of Computer Science & Technology 2019年第3期34卷 622-633页

作者： Han Liu hang Du Dan Zeng qi tian Key Laboratorij of Specialty Fiber Optics and Optical Access Networks Shanghai UniversityShanghai 200444China Shanghai Institute of Advanced Communication and Data Science Shanghai UniversityShanghai 200444China Department of Computer Science The University of Texas at San AntonioSan AntonioU.S.A.

Cloud detection plays a very significant role in remote sensing image *** paper introduces a cloud detection method based on super pixel level classification and semantic ***,remote sensing images are segmented into super *** super pixels compose a super pixel level remote sensing image *** cloud detection is essentially a binary classification task,our database is labeled into four categories to improve the generalization ability:thick cloud,cirrus cloud,building,and other ***,the super pixel level database is used to train our cloud detection models based on convolution neural network(CNN)and deep *** fusion CNN is proposed considering super pixel level images contain less semantic information than normal *** full advantage of low-level features like color and texture information,it is more applicable for super pixel level ***,a distance metric is proposed to refine ambiguous super ***,an end-to-end cloud detection model based on semantic segmentation is *** model has no restrictions on the input size,and takes less *** results show that compared with other cloud detection *** proj)osed method acliieves better performance.

关键词： cloud detection convolution neural network deep forest semantic segmentation

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