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Development characteristics and formation analysis of the Liangjia Village earth fissure in the Weihe Basin,China

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Frontiers of Earth Science 2020年第4期14卷 758-769页

作者： Junhua Zhu jianwei qiao Feiyong Wang Quanzhong Lu Yuyun Xia Ransheng Chen Haiyuan Zhao Jingliang Dong School of Civil Engineering and Architecture East China Jiaotong UniversityNanchang330013China National Experimental Teaching Demonstration Center of Civil Engineering East China Jiaotong UniversityNanchang330013China China Jikan Research Institute of Engineering Investigations and Design Co. Ltd.Xi’an710043China Shaanxi Key Laboratory for the Property and Treatment of Special Soil and Rock Xi’an710043China School of Geological Engineering and Geomatics Chang’an UniversityXi’an710054China

Liangjia Village earth fissure,one of the 79 earth fissures along the Kouzhen-Guanshan fault located in the northern Weihe Basin,causes severe damage to buildings and *** the late 1950s,40 earth fissures have occurred in a similar east-west(EW)direction parallel to the Kouzhen-Guanshan fault,and a further 39 earth fissures have occurred with north-west,east-north,or north-east orientations intersecting the *** this study,a case study of Liangjia Village earth fissure was conducted to investigate the mechanisms of fissure generation in *** and geophysical methods including measurements,trenching,drilling,and seismic exploration were used to reveal the basic characteristics,geological background,and origin model of the Liangjia Village earth *** earth fissure,with a total length of 800 m in 2014,runs EW parallel to the Kouzhen-Guanshan fault,and it has damaged buildings and farmlands by forming sinkholes,gullies,subsidence,and a *** trenching results indicated that this fissure underwent multi-phase *** of geological drilling and shallow seismic profiling results showed that the fissure also possessed characteristics of a synsedimentary *** its genesis,the fissure was formed through the combined actions of three factors:an earthquake created the fissure,the Kouzhen-Guanshan fault controlled its development,and loess erosion and groundwater runoff subsequently enlarged the *** extension first generated many buried faults along the hanging wall of the Kouzhen-Guanshan fault before seismic activity caused the buried faults to propagate to the surface,where loess erosion and ground-water runoff promoted the formation of the current earth fissure.

关键词： earth fissure Kouzhen-Guanshan fault earthquake creep slip loess erosion

Formation Mechanism of Ground Fissures Originated from the Hanging Wall of Normal Fault:A Case in Fen-Wei Basin,China

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Journal of Earth Science 2022年第2期33卷 482-492页

作者： Zhijie Jia Jianbing Peng Quanzhong Lu jianwei qiao Feiyong Wang Mingdong Zang Yang Liu Junyan Zhao Fengji Zhu School of Geological Engineering and Geomatics Chang an UniversityXi'an 710054China Key Laboratory of Western Mineral Resources and Geological Engineering Ministry of Education Chang'an UniversityXfan 710064China China JK Institute of Engineering and Design Xfan 710043China Shaanxi Key Laboratory for the Property and Treatment of Special Soil and Rock Xfan 710043China School of Engineering and Technology China University of GeosciencesBeijing 100083China

This paper takes Fen-Wei Basin(FWB)as a case to study the ground fissures controlled by normal *** on the field investigation,geophysical exploration,drilling,GNSS data and numerical calculation,the characteristics and mechanism of ground fissures originated from the hanging wall of normal faults are *** results show that the distribution of ground fissures in the hanging wall and heading wall of the active faults is not *** fissures are mostly distributed in the hanging wall of active faults and show a linear distribution on the surface,their strike is consistent with the fault,mainly characterized by vertical offset and horizontal *** fissures destroy the farmland and building foundation through which they pass and cause the rupture or *** profile section,the ground fissure shows the characteristics of normal faults and dislocates the strata,and is connected with the underlying *** analysis shows that the vertical displacement of normal fault activity in hanging wall is much larger than that in heading wall,which is the reason that tectonic ground fissures mainly originate from hanging *** range of dangerous area of ground fissures is controlled by the depth of fault,the strength of the ground fissures disaster is mainly controlled by the activity of *** formation of the ground fissures originated from the hanging wall of the fault experienced three stages:the main fault activity stage,the secondary fault activity stage and the fissure formation stage.

关键词： ground fissure Fen-Wei Basin active fault dislocation theory formation mechanism hazards engineering geology

A Comprehensive Method for the Risk Assessment of Ground Fissures:Case Study of the Eastern Weihe Basin

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Journal of Earth Science 2023年第6期34卷 1892-1907页

作者： Zhijie Jia Jianbing Peng Quanzhong Lu Penghui Ma jianwei qiao Feiyong Wang Mingdong Zang Yang Liu Junyan Zhao Fengji Zhu School of Geological Engineering and Geomatics Chang'an UniversityXi'an 710054China Key Laboratory of Western Mineral Resources and Geological Engineering Ministry of Education Chang'an UniversityXi'an 710064China China JK Institute of Engineering and Design Xian 710043China School of Engineering and Technology China University of GeosciencesBeijing 100083China

Ground fissures are influenced by the coupling of geological factors and human *** threaten the safety of infrastructure and restrict town planning in many areas in *** of the area most severely affected by ground fissures is the Weihe Basin in North China,which has the most extensive distribution of ground fissures and all the elements that control their occurrence,pro-viding an ideal study area for the study of ground *** this study,we took the eastern Weihe Ba-sin as the study area and determined the distribution and hazard characteristics of ground fissures via field *** on the analytic hierarchy process,we propose a multi-level,comprehensive method for evaluating the hazards of ground *** method considers the geological back-ground,development status,and triggering factors of ground fissures,including all nine currently known assessment indices of ground *** used judgment matrices to rank the constructed ground fissure assessment index system at the single and total levels and quantified the nine assessment indices of ground fissures according to the field survey ***,we plotted the ground fissure risk zoning map and evaluated the ground fissure risk at the study *** findings indicated that the proposed method could facilitate ground fissure hazard assessment and prediction and provide support for hazard prevention and urban/rural planning.

关键词： ground fissure analytic hierarchy process hazards risk assessment hazard prevention

Glass crystallization making red phosphor for high-power warm white lighting

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Light(Science & Applications) 2021年第4期10卷 570-581页

作者： Tao Hu Lixin Ning Yan Gao jianwei qiao Enhai Song Zitao Chen Yayun Zhou Jing Wang Maxim S.Molokeev Xiaoxing Ke Zhiguo Xia Qinyuan Zhang School of Physics and Optoelectronics State Key Laboratory of Lum inescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhouGuangdongChina Anhui Key Laboratory of Optoelearic Materials Science and Technology Key Laboratory of Functional Molecular SolidsMinistry of EducationAnhui Normal UniversityWuhuAnhuiChina School of Applied Physic and Materials Wuyi UniversityJiangmenGuangdongChina Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry State Key Laboratory of Optoelectronic Materials and TechnologiesKLGHEI of Environment and Energy ChemistrySchool of Chemistry and Chemical EngineeringSun Yat-sen UniversityGuangzhouGuangdongChina Laboratory of Crystal Physics Kirensky Institute of PhysicsFederal Research Center KSC SB RASKrasnoyarskRussia Siberian Federal University KrasnoyarskRussia Research and Developm ent Department Kemerovo State UniversityKemerovoRussia lnstitute of Microstructure and Property of Advanced Materials Beijing University of Technology BeijingBeijingChina

Rapid development of solid-state lighting technology requires new materials with highly efficient and stable luminescence,and especially relies on blue light pumped red phosphors for improved light ***,we discovered an unprecedented red-emitting Mg_(2)AI_(4)Si_(5)0_(18):Eu^(2+)composite phosphor(λex=450 nm,λem=620 nm)via the crystallization of MgO-AI_(2)O_(3)-Sio_(2) aluminosilicate *** experimental measurement and first-principles calculations verify that Eu^(2+)dopants insert at the vacant channel of Mg_(2)AI_(4)Si_(5)0_(18)crystal with six-fold coordination responsible for the peculiar red ***,the resulting phosphor exhibits high internal/external quantum efficiency of 94.5/70.6%,and stable emission against thermal quenching,which reaches industry *** maximum luminous flux and luminous efficiency of the constructed laser driven red emitting device reaches as high as 274 Im and 54lm W^(-1),*** combinations of extraordinary optical properties coupled with economically favorable and innovative preparation method indicate,that the Mg_(2)AI_(4)Si_(5)0_(18):Eu^(2+)composite phosphor will provide a significant step towards the development of high-power solid-state lighting.

关键词： power pumped lighting

Characteristics and formation analysis of earth fissure in Anren area in Wei River Basin， China

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Journal of Earth Science 2022年

作者： jianwei qiao Zhenjiang Meng Yuyun Xia Cong Liu Quanzhong Lu Feiyong Wang Yuanqiang Zhou Haiyuan Zhao China Jikan Research Institute of Engineering Investigations and Design Co.， Ltd. Shaanxi Key Laboratory for the Property and Treatment of Special Soil and Rock School of Geological Engineering and Geomatics， Chang'an University Key Laboratory of Western China Mineral Resources and Geological Engineering School of Engineering and Technology， China University of Geosciences (Beijing)

Since the 1950’s， 212 earth fissures have been discovered in the Wei River Basin. During a field survey in 2016， an additional 48 earth fissures were discovered in Anren area， northeast of the Wei River Basin. The characteristics and formation mechanisms of these fissures were studied through field investigations， measurements， trench excavation， and drilling. On-site investigations indicated that these earth fissures were distributed along a fault-controlled geomorphic boundary. Fissures trended at 60°–80° NE and were divided into five groups. Trenches revealed multiple secondary fissures， exposing severe soil ruptures in the shallow earth surfaces. Drilling profiles revealed that earth fissures dislocated several strata， and resembled synsedimentary faults. Seismic reflection profiles revealed buried faults beneath the earth fissures. The Anren area fissures formed in the following three stages: regional extension that initially generated multiple buried faults; seismic activity rupturing multiple strata， resulting in multiple buried fractures; and finally， erosion processes that propagated the buried fractures to the surface， forming the current earth fissures.

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Multi-responsive deep-ultraviolet emission in praseodymium-doped phosphors for microbial sterilization

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Science China Materials 2022年第4期65卷 1103-1111页

作者： Xinquan Zhou jianwei qiao Yifei Zhao Kai Han Zhiguo Xia The State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSchool of Materials Science and TechnologySouth China University of TechnologyGuangzhou510641China School of Physics and Optoelectronics South China University of TechnologyGuangzhou510641China

Perusing multimode luminescent materials capable of being activated by diverse excitation sources and realizing multi-responsive emission in a single system remains a ***,we utilize a heterovalent substituting strategy to realize multimode deep-ultraviolet(UV)emission in the defect-rich host Li_(2)CaGeO_(4)(LCGO).Specifically,the Pr^(3+)substitution in LCGO is beneficial to activating defect site reconstruction including the generation of cation defects and the decrease of oxygen *** of different traps in LCGO:Pr^(3+)presents persistent luminescence and photo-stimulated luminescence in a synergetic ***,the up-conversion luminescence appears with the aid of the 4f discrete energy levels of Pr^(3+)ions,wherein incident visible light is partially converted into germicidal deep-UV *** multi-responsive character enables LCGO:Pr^(3+)to response to convenient light sources including X-ray tube,standard UV lamps,blue and near-infrared ***,a dual-mode optical conversion strategy for inactivating bacteria is fabricated,and this multi-responsive deep-UV emitter offers new insights into developing UV light sources for sterilization *** substituting in trap-mediated host lattice also provides a methodological basis for the construction of multi-mode luminescent materials.

关键词： phosphor deep ultraviolet multi-mode luminescence sterilization

Near UV-pumped yellow-emitting Sr_9Mg Li(PO_4)_7:Eu^(2+) phosphor for white-light LEDs

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Science China Materials 2018年第7期61卷 985-992页

作者： jianwei qiao Zhiguo Xia Zhichao Zhang Bintao Hu Quanlin Liu. The Beijing Municipal Key Laboratory of New Energy Materials and Technologies School of Materials Sciences and Engineering University of Science and Technology Beijing Beijing 100083 China

Laboratory discovery of new phosphors for white-light light-emitting diodes （WLEDs） is still an im- perative challenge. A new yellow-emitting Sr9MgLi（PO4）7：Eu^2＋ phosphor was discovered based on the mineral-inspired pro- totype evolution and new phase construction strategy pro- posed by our group. Sr9MgLi（PO4）7：Eu^2＋ has been synthesized by using a high temperature solid-state method, and its phase structure and luminescence properties have been investigated in detail, and applied in WLED lamp. Sr9MgLi（PO4）7 phase is derived from the ]3-Ca3（PO4）2-type mineral structure. Upon 365 nm UV light excitation, the SrgMgLi（PO4）7：Eu^2＋ phosphor exhibits a broad emission band from 450 nm to 700 nm. The white-light LED lamp was fabricated based on the phosphor blends of the composition-optimized yellow-emitting Sr9MgLi （PO4）7：Eu2＋ and commercial blue-emitting BaMgAl10O17：Eu^2＋, and a 365 nm UV chip was used as the excitation source. The Ra, CCT value and CIE of the as-fabricated LEDs were found to be 83, 5,612 K, and （0.324, 0.358）, respectively. All the results indicate that Sr9MgLi（PO4）7：Eu^2＋ could be potential in the development of UV-pumped white-light LEDs.

关键词： hosphor luminescence rare earth LEDs

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创业板企业融资决策对企业创新绩效的影响

科技进步与对策 2020年第12期37卷 90-98页

作者：乔建伟山西转型综合改革示范区管委会山西太原030032

在我国经济结构转型、债务压力化解的新形势下,企业通过融资能够有效提高资源利用效率,从而提升企业创新绩效。选取2010—2018年中国创业板上市公司为研究样本,并从企业债务治理角度,实证研究探讨融资类型以及融资限期对创业板企业创新... 详细信息

在我国经济结构转型、债务压力化解的新形势下,企业通过融资能够有效提高资源利用效率,从而提升企业创新绩效。选取2010—2018年中国创业板上市公司为研究样本,并从企业债务治理角度,实证研究探讨融资类型以及融资限期对创业板企业创新绩效的影响。研究发现:①创业板企业融资决策与企业创新绩效显著相关;②商业信用融资、银行贷款等外源融资与企业创新绩效呈负相关;③股权的内源融资与企业创新绩效呈显著正相关;④在融资限期结构中,长期借款对企业绩效的负向作用比短期借款更大。基于以上发现,从风险控制角度提出相关建议,以期找到适合创业板企业的融资方式,促进企业创新绩效提升。

关键词：创业板企业融资决策融资结构创新绩效

Eu^(2+)激活无机近红外荧光粉的研究进展

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中国稀土学报 2023年第1期41卷 25-38页

作者：乔建伟夏志国华南理工大学发光材料与器件国家重点实验室广东省光纤激光材料与应用技术重点实验室广东广州510641 华南理工大学物理与光电学院广东广州510641

荧光转换型宽带近红外(NIR)发光二极管(LED)光源因其具有光谱可调、器件紧凑性和低成本等优势,在安防监控、现代农业、食品安全和医疗检测等诸多领域显示出巨大的应用前景。Eu^(2+)激活无机发光材料已成功商用于固态照明和显示领域,然而... 详细信息

荧光转换型宽带近红外(NIR)发光二极管(LED)光源因其具有光谱可调、器件紧凑性和低成本等优势,在安防监控、现代农业、食品安全和医疗检测等诸多领域显示出巨大的应用前景。Eu^(2+)激活无机发光材料已成功商用于固态照明和显示领域,然而,受晶体场强度及电子云膨胀效应等因素的限制,迄今为止,基于Eu^(2+)作为掺杂发光离子的近红外荧光粉体系依然十分匮乏,且存在量子效率低和热稳定性差等共性问题。设计研发适合近紫外-蓝光激发的新型、高效率和高热稳定性的Eu^(2+)激活近红外发光材料是未来近红外荧光粉发展的主要挑战之一,也是获得高性能NIR光源的关键。本文综述了Eu^(2+)激活无机近红外荧光粉的最新研究进展,从晶体结构、格位占据角度阐述了Eu^(2+)的近红外发光机制及光谱调控策略,并针对目前存在的问题,提出了未来发展方向,旨在为新型高性能宽带近红外发光材料的研发提供借鉴与指导。

关键词：近红外荧光粉 Eu^(2+)离子稀土 LED