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Dam foundation excavation techniques in China:A review

Journal of Rock Mechanics and Geotechnical Engineering 2013年第6期5卷 460-467页

作者： yuzhu zhang Wenbo Lu Ming Chen Peng Yan Yingguo Hu State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University

A protective layer(PL) is commonly reserved above foundation surface to protect the underlying rock mass during dam foundation excavation. In China, the PL of dam foundation is conventionally subdivided into two or three thin layers and excavated with the shallow-hole blasting method, even by pneumatic pick method in case of soft rock mass. The aforementioned layered excavation of the PL delays the construction of the whole project. After nearly 30-year practices, several safe and effcient methods for the PL excavation of dam foundation are gradually developed. They include shallow-hole bench blasting with cushion material(SBC) at the bottom of the hole, and horizontal smooth blasting(HSB). The PL is even cancelled on the condition that horizontal pre-split technique is employed during dam foundation excavation. This paper introduces the aforementioned two PL excavation methods(shallow-hole blasting and bench blasting) and horizontal pre-split technique of dam foundation without protective layer(HPP). The basic principles of blasting method, blasting geometry, charge structure, drill-and-blast parameters of typical projects are examined. Meanwhile, the merits and limitations of each method are compared. Engineering practices in China show that HSB is basically the optimal method for dam foundation PL excavation in terms of foundation damage control and rapid construction. Some new problems for dam foundation PL excavation arising, such as strong unloading and relaxation phenomenon that encountered in the gorge region of southwest China, are needed to be addressed; and the corresponding countermeasures are discussed as well.

关键词： Dam foundation Protective layer(PL) Excavation Blasting Rapid construction

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MoS2 Nanosheets Sensitized with Quantum Dots for Room-Temperature Gas Sensors

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Nano-Micro Letters 2020年第5期12卷 20-32页

作者： Jingyao Liu Zhixiang Hu yuzhu zhang HuaYao Li Naibo Gao Zhilai Tian Licheng Zhou Baohui zhang Jiang Tang Jianbing zhang Fei Yi Huan Liu School of Optical and Electronic Information Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology1037 Luoyu RoadWuhan 430074People’s Republic of China

The Internet of things for environment monitoring requires high performance with low power-consumption gas sensors which could be easily integrated into large-scale sensor *** semiconductor gas sensors have many advantages such as excellent sensitivity and low cost,their application is limited by their high operating ***-dimensional(2D)layered materials,typically molybdenum disulfide(MoS2)nanosheets,are emerging as promising gas-sensing materials candidates owing to their abundant edge sites and high in-plane carrier *** work aims to overcome the sluggish and weak response as well as incomplete recovery of MoS2 gas sensors at room temperature by sensitizing MoS2 nanosheets with PbS quantum dots(QDs).The huge amount of surface dangling bonds of QDs enables them to be ideal receptors for gas *** sensitized MoS2 gas sensor exhibited fast and recoverable response when operated at room temperature,and the limit of NO2 detection was estimated to be 94 *** strategy of sensitizing 2D nanosheets with sensitive QD receptors may enhance receptor and transducer functions as well as the utility factor that determine the sensor performance,offering a powerful new degree of freedom to the surface and interface engineering of semiconductor gas sensors.

关键词： Gas sensor Room temperature Molybdenum disulfide Quantum dot Nitrogen dioxide

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Biotemplated fabrication of hierarchical mesoporous CeO_2 derived from diatom and its application for catalytic oxidation of CO

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Chinese Science Bulletin 2014年第26期59卷 3260-3265页

作者： Junchao Qian Zhigang Chen Chengbao Liu Fang Wang yuzhu zhang Mengmeng Wang Department of Material Science and Engineering Jiangsu University Jiangsu Key Laboratory for Environment Functional Materials Suzhou University of Science and Technology School of Chemistry Biology and Materials EngineeringSuzhou University of Science and Technology Department of Materials Science and Engineering Changzhou University

Hierarchically hollow nanostructures have been the focus of numerous studies due to their prominent physicochemical properties that differ significantly from bulk materials and their potential for extensive applications. We present a novel diatom-based scaffold for the synthesis of hierarchically biomorphic CeO2 with special porous structure via incorporating Ce ions into the *** electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and nitrogen adsorption-desorption measurements were adopted to characterize the products. Owing to its unique hierarchical structure and periodic meso-macro scale features, the obtained CeO2 exhibits high catalytic activity in CO oxidation. This facile strategy may design a new way towards replicating desired biological structures for metal oxide catalyst in other potential applications.

关键词： CO氧化氧化铈应用催化氧化硅藻 X射线光电子能谱法金属氧化物催化剂扫描电子显微镜

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Colorimetric recognition of melamine in milk using novel pincer zinc complex stabilized gold nanoparticles

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Chinese Chemical Letters 2021年第10期32卷 3023-3026页

作者： Xiaoling Bao Jianhong Liu Qingshu Zheng Lixin Duan yuzhu zhang Junlong Qian Tao Tu Institute of Quality Inspection of Food and Cosmetics Shanghai Institute of Quality Inspection and Technical ResearchShanghai 200233China Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Department of ChemistryFudan UniversityShanghai 200438China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200232China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China

A convenient colorimetric approach for visual detection of melamine in raw milk was realized by using gold nanoparticles(AuNPs)stabilized by an unsymmetrical terpyridyl zinc complex with a thymine fragment at one terminal and a quaternary ammonium salt at the *** without pre-addition of melamine or relative additives,obvious color change from red to blue was observed by naked eye in the presence of trace amount of melamine,which was attributed to the alternation of aggregation state of AuNPs caused by the selective binding between the thymine fragment and melamine via triple hydrogenbonding ***,the detection limit for melamine was as low as 2.4 ppb,providing a highly sensitive and efficient approach for the visual detection of melamine.

关键词： Colorimetric recognition Gold nanoparticles Hydrogen-bonding interactions Pincer zinc complex Melamine

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Trustworthiness Technologies of DDSS

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Wuhan University Journal of Natural Sciences 2006年第6期11卷 1853-1856页

作者： TIAN Junfeng XIAO Bing WANG Zixian zhang yuzhu Institute of Network Technology Hebei University Baoding 071002 Hebei China Xingtai Municipal Bureau of Radio and Television Xingtai 054000 Hebei China

The most significant strategic development in information technology over the past years has been ＂trusted computing＂ and trusted computers have been produced. In this paper trusted mechanisms adopted by PC is imported into distributed system, such as chain of trust, trusted root and so on. Based on distributed database server system （DDSS）, a novel model of trusted distributed database server system （TDDSS） is presented ultimately. In TDDSS role-based access control, two-level of logs and other technologies are adopted to ensure the trustworthiness of the system.

关键词： trusted computing trusted distributed database trusted authorization chain of trust

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Association between GABRG2 rs211037 polymorphism and idiopathic generalized epilepsies:a meta-analysis

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Acta Epileptologica 2021年第1期3卷 64-70页

作者： Xiaohui Yang Hongyun Ding Hongyun Wei Jia Liu Pingping Liao yuzhu zhang Xiaomeng Wang Xiaosa Chi Department of Respiratory Affiliated Hospital of Qingdao UniversityQingdao 266000China Department of Gastroenterology Qingdao Municipal Hospital GroupQingdao 266000China Department of Gastroenterology Affiliated Hospital of Qingdao UniversityQingdao 266000China Department of Geriatrics Affiliated Hospital of Qingdao University59 Haier RoadQingdaoShandong 266100China

Background:We performed this meta-analysis to investigate the association between GABRG2 rs211037polymorphism and the risk for idiopathic generalized epilepsies(IGEs).Methods:Medline,Embase,Cochrane Library and Chinese National Knowledge Infrastructure(CNKI)databases were searched for eligible studies(until May 5,2020)on the association between GABRG2 rs211037 polymorphism and *** odds ratios were calculated using a fixed or random model in STATA 15.0 *** analyses for ethnicity,age,source of controls,type of seizure syndrome and therapeutic responses were ***:We found no significant associations between GABRG2 rs211037 polymorphism and the susceptibility to *** addition,no significant association was detected between GABRG2 rs211037 polymorphism and drug resistance in IGE *** results did not change after stratification by Asian population,healthy controls,children,juvenile myoclonic epilepsy,and childhood absence ***:The current studies indicated that the GABRG2 rs211037 polymorphism was not related to susceptibility or drug resistance of *** well-designed studies are needed to verify the results.

关键词： GABRG2 rs211037 Idiopathic generalized epilepsies Polymorphism

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一种实用、高效的结构优化设计方法研究

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北京航空航天大学学报 1999年第6期25卷 647-650页

作者：张玉珠张亚北京航空航天大学宇航学院

采用泰勒（Ｔａｙｌｏｒ）公式将原数学规划问题中的目标函数归并成对数形式下的二次函数，并采用丢芬（Ｄｕｆｆｉｎ）公式将原数学规划问题中的约束函数归并成单项式，再取对数，使其转化成线性函数，形成二次规划问题．然后用广义... 详细信息

采用泰勒（Ｔａｙｌｏｒ）公式将原数学规划问题中的目标函数归并成对数形式下的二次函数，并采用丢芬（Ｄｕｆｆｉｎ）公式将原数学规划问题中的约束函数归并成单项式，再取对数，使其转化成线性函数，形成二次规划问题．然后用广义乘子法来求解二次规划问题．最后用一实例对该方法进行验证．

关键词：结构优化数学规划二次规化

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Baiting bacteria with amino acidic and peptidic corona coated defect-engineered antimicrobial nanoclusters for optimized wound healing

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Bioactive Materials 2024年第12期42卷 628-643页

作者： Maonan Wang Houjuan Zhu Yuling Xue Yanxia Duan Hua Tian Qi Liu yuzhu zhang Zibiao Li Xian Jun Loh Enyi Ye Gang Yin Xuemei Wang Xianguang Ding David Tai Leong Department of Chemical and Biomolecular Engineering Faculty of EngineeringNational University of SingaporeSingapore117585Singapore Department of Pathology Xiangya HospitalSchool of Basic Medical SciencesCentral South UniversityChangshaChina Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A*STAR)2 Fusionopolis WayInnovis#08-03Singapore138634Singapore State Key Laboratory of Bioelectronics(Chien-Shiung Wu Lab) School of Biological Science and Medical EngineeringSoutheast UniversityNanjing210096China Key Laboratory for Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Nanjing University of Posts&TelecommunicationsNanjing210023China

Keeping steps ahead of the bacteria in the race for more efficacious antibacterial strategies is increasingly difficult with the advent of bacterial resistance ***,we engineered copper sulfide nanoclusters(CuS_(x) NCs)with variable sulfur defects for enhanced dual-treatment of bacterial infections by manipulating photothermal effects and Fenton-like ***,by encasing CuS_(x) NCs with a complex mixture of amino acids and short peptides derived from Luria-Bertani bacterial culture media as a protein corona,we managed to coax *** to take up these CuS_(x) *** a whole,Amino-Pep-CuS_(x) NCs was perceived as a food source and actively consumed by bacteria,enhancing their effective uptake by at least 1.5-fold greater than full length BSA protein BSA-corona CuS_(x) *** strategically using defect-engineering,we successfully fine-tune photothermal effect and Fenton-like capacity of CuS_(x) *** sulfur defects lead to reduced but sufficient heat generation under solar-light irradiation and increased production of toxic hydroxyl *** fine-tuning sulfur defects during synthesis,we achieve CuS_(x) NCs with an optimal synergistic effect,significantly enhancing their bactericidal *** ultra-small and biodegradable CuS_(x) NCs can rapidly break down after treatment for ***,Amino-Pep-CuS_(x) NCs demonstrate effective eradication of bacteria both in vitro and in vivo because of their relatively high uptake,optimal balanced photothermal and chemodynamic *** study offers a straightforward and efficient method to enhance bacterial uptake of next generation of antibacterial agents.

关键词： Defect-engineered Photothermal effect Chemodynamic effect Copper sulfide nanoclusters Protein corona

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Buried interface bridging for inverted cesium-formamidinium triiodide perovskite solar cells with long operational stability

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Science China Chemistry 2025年第1期68卷 163-173页

作者： Chenhui zhang Chunjun Liang Fulin Sun Ting Zhu Xinghai Huang yuzhu Guo Xinyu Guo Kunyang Ge Dan Li Fangtian You Zhiqun He Key Laboratory of Luminescence and Optical Information Ministry of Education Institute of Optoelectronic TechnologyBeijing Jiaotong University Department of Physics School of Physical Science and Engineering Beijing Jiaotong University

In the field of perovskite solar cells(PSCs), the research on defects in the buried interface has been relatively limited due to its non-exposure; however, this interface significantly impacts the performance enhancement of inverted PSCs. This study employs phenylethylammonium chloride(PEACl) molecules as a buffer layer to modify the buried interface of p-i-n structured PSCs,aiming to enhance the uniformity of self-assembled monolayers(SAMs) and facilitate the uniform nucleation and growth of perovskite films on the substrate. Furthermore, the introduction of the PEACl buffer layer effectively passivates defects at the bottom of the perovskite layer and notably enhances the crystal quality of the perovskite film by mitigating residual stress,thereby reducing nonradiative recombination loss. Following these optimizations, the MA-free PSCs treated with PEACl achieve a power conversion efficiency(PCE) of 24.11%, with significant improvements in storage, thermal stability, and operational stability. Particularly noteworthy is the device's performance in an unencapsulated state, whereas after 1,500 hours of continuous light operation stability testing, it retains 97% of its original efficiency. This study not only enriches the systematic understanding of the characteristics of the buried interface in PSCs but also contributes significantly to advancing the commercial production of perovskite photovoltaic technology.

关键词： defect-induced recombination buried interfaces inverted perovskite solar cells crystallization lattice mismatch

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工作面突出危险性预测指标K1临界值研究

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矿业安全与环保 2020年第6期47卷 94-97页

作者：张玉柱瓦斯灾害监控与应急技术国家重点实验室重庆400037 中煤科工集团重庆研究院有限公司重庆400037

以中岭一井3号煤层为例,介绍了一种假设—考察—修正—确定递进式工作面突出危险性预测指标K 1临界值的确定方法。首先根据历史资料统计分析和实验室理论计算确定3号煤层钻屑瓦斯解吸指标K 1的合理临界初值,为现场考察修正奠定基础;其... 详细信息

以中岭一井3号煤层为例,介绍了一种假设—考察—修正—确定递进式工作面突出危险性预测指标K 1临界值的确定方法。首先根据历史资料统计分析和实验室理论计算确定3号煤层钻屑瓦斯解吸指标K 1的合理临界初值,为现场考察修正奠定基础;其次通过统计分析采掘工作面预测历史数据,掌握工作面预测区域瓦斯赋存分布规律,确定采掘工作面现场考察区域并对K 1临界初值进行考察;依据考察结果,分析修正K 1的临界初值;对修正的K 1临界初值进行扩大应用试验;最后确定3号煤层工作面突出危险性预测指标K 1临界值为0.55 mL/(g·min 1/2),以及其应用条件,验证了研究方法的可行性。

关键词：煤与瓦斯突出预测钻屑瓦斯解吸指标临界值瓦斯赋存

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