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Mechanical properties and influence mechanism of confined concrete arches in high-stress tunnels

International Journal of Mining Science and Technology 2023年第7期33卷 829-841页

作者： Bei Jiang Zhongxin Xin Xiufeng Zhang Yusong Deng mingzi wang Shidong Li Wentao Ren State Key Laboratory for Geo-mechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Research Center of Geotechnical and Structural Engineering Shandong UniversityJinan 250061China Shandong Energy Group Co. Ltd.Jinan 250014China

Deep underground projects(e.g., coal mines), are often faced with complex conditions such as high stress and extremely soft rock. The strength and rigidity of the traditional support system are often insufficient,which makes it difficult to meet the requirements of ground control under complex conditions. As a new support form with high strength and rigidity, the confined concrete arch plays an important role in controlling the rock deformation under complex conditions. The section shape of the tunnel has an important impact on the mechanical properties and design of the support system. However, studies on the mechanical properties and influence mechanism of the new confined concrete arch are rarely reported. To this end, the mechanical properties of traditional U-shaped steel and new confined concrete arches are compared and comparative tests on arches of circular and straight-leg semicircular shapes in deep tunnels are conducted. A large mechanical testing system for underground engineering support structure is developed. The mechanical properties and influence mechanism of confined concrete arches with different section shapes under different loading modes and cross-section parameters are systematically studied. Test results show that the bearing capacity of the confined concrete arch is 2.10 times that of the U-shaped steel arch, and the bearing capacity of the circular confined concrete arch is 2.27 times that of the straight-leg semicircular arch. Among the various influencing factors and their engineering parameters,the lateral stress coefficient has the greatest impact on the bearing capacity of the confined concrete arch,followed by the steel pipe wall thickness, steel strength, and core concrete strength. Subsequently, the economic index of bearing capacity and cost is established, and the optimization design method for the confined concrete arch is proposed. Finally, this design method is applied to a high-stress tunnel under complex conditions, and the d

关键词： High-stress tunnel Confined concrete arch Section shape Mechanical properties Design method

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南方离子型稀土矿区地下水氨氮污染现状及其治理技术

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福建冶金 2024年第1期53卷 35-38页

作者：赵倩倩赖小彬洪本根王明兹福建师范大学生命科学学院福建福州350117 龙岩市稀土开发有限公司福建龙岩364000

我国是主要的稀土出产国,约占全球年产量的90%以上。当前,我国离子型稀土矿采用硫酸铵介导的原地浸矿工艺,造成矿区及周边地下水氨氮污染,严重的超标高达200倍以上。本文分析了离子型稀土矿区地下水氨氮污染来源与现状,阐述了地下水氨... 详细信息

我国是主要的稀土出产国,约占全球年产量的90%以上。当前,我国离子型稀土矿采用硫酸铵介导的原地浸矿工艺,造成矿区及周边地下水氨氮污染,严重的超标高达200倍以上。本文分析了离子型稀土矿区地下水氨氮污染来源与现状,阐述了地下水氨氮污染治理技术,以期为我国稀土矿区地下水氨氮污染治理开发绿色、安全的新技术提供参考。

关键词：离子型稀土矿硫酸铵原地浸矿地下水污染氨氮治理

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Non-bonding modulations between single atomic cerium and monodispersed selenium sites towards efficient oxygen reduction

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Nano Research 2024年第6期17卷 4753-4763页

作者： Leilei Yin Shuai Zhang mingzi Sun Siyuan wang Bolong Huang Yaping Du Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional MaterialsHaihe Laboratory of Sustainable Chemical TransformationsSmart Sensing Interdisciplinary Science CenterSchool of Materials Science and EngineeringNational Institute for Advanced MaterialsNankai UniversityTianjin 300350China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloon 999077Hong KongChina Research Centre for Carbon-Strategic Catalysis The Hong Kong Polytechnic UniversityHung HomKowloon 999077Hong KongChina

Currently,dual atomic catalysts(DACs)with neighboring active sites for oxygen reduction reaction(ORR)still meet lots of challenges in the synthesis,especially the construction of atomic pairs of elements from different blocks of the periodic ***,a“rare earth(Ce)-metalloid(Se)”non-bonding heteronuclear diatomic electrocatalyst has been constructed for ORR by rational coordination and carbon support defect ***,the optimized Ce-Se diatomic catalysts(Ce-Se DAs/NC)displayed a half-wave potential of 0.886 V *** hydrogen electrode(RHE)and excellent stability,which surpass those of separate Ce or Se single atoms and most single/dual atomic catalysts ever *** addition,a primary zinc-air battery constructed using Ce-Se DAs/NC delivers a higher peak power density(209.2 mW·cm^(−2))and specific capacity(786.4 mAh·gZn^(−1))than state-of-the-art noble metal catalysts Pt/*** calculations reveal that the Ce-Se DAs/NC has improved the electroactivity of the Ce-N_(4)region due to the electron transfer towards the nearby Se specific activity(SA)***,the more electron-rich Se sites promote the adsorptions of key intermediates,which results in the optimal performances of ORR on Ce-Se DAs/*** work provides new perspectives on electronic structure modulations via non-bonded long-range coordination micro-environment engineering in DACs for efficient electrocatalysis.

关键词： catalyst rare earth oxygen reduction reaction(ORR) metalloid non-bonding modulation

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Atomscopic of ripple origins for two-dimensional monolayer transition metal dichalcogenides

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Nano Research 2024年第3期17卷 2136-2144页

作者： Haitao Yu mingzi Sun Xiao Wu Cheuk Hei Chan Bolong Huang Zhong Lin wang CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityKowloon 999077Hong KongChina Research Centre for Carbon-Strategic Catalysis The Hong Kong Polytechnic UniversityKowloon 999077Hong KongChina School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332USA

During the development of ultrathin two-dimensional(2D)materials,the appearance of ripples has been widely ***,the formation mechanisms and their influences are still rarely investigated,especially their contributions to the electronic structures and optical *** compensate for the knowledge gap,we have carried out comprehensive theoretical studies on the monolayer WSe_(2) with a series of ripple structures from 0 to 12Åin different lattice *** sensitivity of the formation energy,band structures,electronic structures,and optical properties to the ripple structures have been performed systematically for the first *** formation of ripples in Armchair and zigzag simultaneously are more energetically favorable,leading to more flexible optimizations of the optoelectronic *** improved charge-locking effect and extension of absorption ranges indicate the significant role of ripple *** spontaneous formation of ripples is associated with orbital rearrangements and structural *** leads to the unique charge carrier correlate inversion between W-5d and Se-4p orbitals,resulting in the pinning of the Fermi *** work has supplied significant references to understand ultrathin 2D structures and benefit their future developments and applications in high-performance optoelectronic devices.

关键词： two-dimensional(2D)materials ripples strain effect charge carrier correlation inversion optoelectronic properties

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Dilute Aqueous-Aprotic Electrolyte Towards Robust Zn-Ion Hybrid Supercapacitor with High Operation Voltage and Long Lifespan

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Nano-Micro Letters 2024年第9期16卷 1-12页

作者： Shuilin Wu Yibing Yang mingzi Sun Tian Zhang Shaozhuan Huang Daohong Zhang Bolong Huang Pengfei wang Wenjun Zhang Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education&Hubei Key Laboratory of Catalysis and Materials Science South-Central Minzu UniversityWuhan 430074People’s Republic of China Department of Materials Science and Engineering and Center of Super‑Diamond and Advanced FilmsCity University of Hong Kong83 Tat Chee AvenueKowloon TongHong Kong SARPeople’s Republic of China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SARPeople’s Republic of China Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijingPeople’s Republic of China

With the merits of the high energy density of batteries and power density of supercapacitors,the aqueous Zn-ion hybrid supercapacitors emerge as a promising candidate for applications where both rapid energy delivery and moderate energy storage are ***,the narrow electrochemical window of aqueous electrolytes induces severe side reactions on the Zn metal anode and shortens its *** also limits the operation voltage and energy density of the Zn-ion hybrid ***'water in salt'electrolytes can effectively broaden their electrochemical windows,but this is at the expense of high cost,low ionic conductivity,and narrow temperature compatibility,compromising the electrochemical performance of the Zn-ion hybrid ***,designing a new electrolyte to balance these factors towards high-performance Zn-ion hybrid supercapacitors is urgent and *** developed a dilute water/acetonitrile electrolyte(0.5 m Zn(CF_(3)SO_(3))_(2)+1 m LiTFSI-H_(2)O/AN)for Zn-ion hybrid supercapacitors,which simultaneously exhibited expanded electrochemical window,decent ionic conductivity,and broad temperature *** this electrolyte,the hydration shells and hydrogen bonds are significantly modulated by the acetonitrile and *** a result,a Zn-ion hybrid supercapacitor with such an electrolyte demonstrates a high operating voltage up to 2.2 V and long lifespan beyond 120,000 cycles.

关键词： Zn-ion supercapacitors Zn metal anode Electrolyte engineering Hydrogen bonds Solvation structures

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CMN: a co-designed neural architecture search for efficient computing-in-memory-based mixture-of-experts

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Science China(Information Sciences) 2024年第10期67卷 100-114页

作者： Shihao HAN Sishuo LIU Shucheng DU mingzi LI Zijian YE Xiaoxin XU Yi LI Zhongrui wang Dashan SHANG Department of Electrical and Electronic Engineering The University of Hong Kong ACCESS-AI Chip Center for Emerging Smart Systems InnoHK Centers Key Lab of Fabrication Technologies for Integrated Circuits Chinese Academy of Sciences Laboratory of Microelectronics Devices and Integrated Technology Institute of MicroelectronicsChinese Academy of Sciences University of Chinese Academy of Sciences School of Microelectronics Southern University of Science and Technology

Artificial intelligence(AI) has experienced substantial advancements recently, notably with the advent of large-scale language models(LLMs) employing mixture-of-experts(MoE) techniques, exhibiting human-like cognitive skills. As a promising hardware solution for edge MoE implementations, the computing-in-memory(CIM) architecture collocates memory and computing within a single device, significantly reducing the data movement and the associated energy consumption. However, due to diverse edge application scenarios and constraints, determining the optimal network structures for MoE, such as the expert's location,quantity, and dimension on CIM systems remains elusive. To this end, we introduce a software-hardware co-designed neural architecture search(NAS) framework, CIM-based MoE NAS(CMN), focusing on identifying a high-performing MoE structure under specific hardware constraints. The results of the NYUD-v2 dataset segmentation on the RRAM(SRAM) CIM system reveal that CMN can discover optimized MoE configurations under energy, latency, and performance constraints, achieving 29.67×(43.10×) energy savings,175.44×(109.89×) speedup, and 12.24× smaller model size compared to the baseline MoE-enabled Visual Transformer, respectively. This co-design opens up an avenue toward high-performance MoE deployments in edge CIM systems.

关键词： mixture-of-experts computing-in-memory neural architecture search resistive random-access memory static random-access memory

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Elucidating the interplay of ferroptosis-related genes in keloid formation:Insights from bioinformatics analysis

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Chinese Journal of Plastic and Reconstructive Surgery 2024年第2期6卷 57-64页

作者： Zikai Qiu mingzi Zhang Wenchao Zhang Loubin Si Nanze Yu Xiaojun wang Department of Plastic and Reconstructive Surgery Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing100730China

Background:Keloids are benign skin tumors characterized by fibroblast proliferation,tumor-like biological behavior,and excessive deposition of extracellular matrix in wounded ***,a type of programmed cell death,is critical in tumor *** aimed to investigate the role of ferroptosis in keloid ***:We downloaded public high-throughput sequencing raw count data(GSE92566),containing three normal skin and four keloid samples,from the Gene Expression Omnibus ***-related genes were obtained from the Ferroptosis database *** ferroptosis-related differentially expressed genes(FRDEGs)were obtained by merging differentially expressed genes with ferroptosis-related *** FRDEGs were then used for Gene Ontology,Kyoto Encyclopedia of Genes and Genomes,Gene Set Enrichment Analysis,proteinprotein interaction(PPI)network,and microRNA(miRNA)-mRNA network ***,real-time quantitative polymerase chain reaction(RT-qPCR)was performed to validate our ***:We found 25 FRDEGs,including 8 up-regulated and 17 down-regulated *** enrichment analysis revealed that the Hippo and transforming growth factorβsignaling pathways were significantly upregulated in *** contrast,regulation of the peroxisome proliferator-activated receptor signaling pathway,glutathione metabolism,and unsaturated fatty acid metabolic process were *** and FRDEGs hub networks were constructed using the STRING database and Cytoscape *** hub genes were identified,including PLA2G6,RARRES2,SNCA,CYP4F8,CDKN2A,ALOX12,FABP4,ALOX12B,NEDD4,and *** constructed a miRNA-mRNA network,which predicted hsa-mir-155-5p,hsa-let-7b-5p,hsa-mir-124-3p,hsa-mir-145-5p,hsa-mir-328-3p,hsa-mir-24-3p,and hsa-mir-10b-5p as the most connected miRNAs regulating ferroptosis in ***,we verified the expression levels of the hub genes by RT-qPCR,which confirmed that ALOX12,ALOX12B,and CYP4F8 expression were reduced i

关键词： Keloid Ferroptosis Bioinformatics Fatty acid metabolic process

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Green-tech Recycling Power Points

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China Weekly 2024年第7期 27-31页

作者： Li mingzi wang Yan 不详

As the government pushes old-for-new consumption policies,the electric vehicle battery recycling industry is scrambling to keep up with the rules,both at home and abroad.

关键词： cycling battery push

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Improving pectinase production by genome shuffling

Improving pectinase production by genome shuffling

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生命的分子机器及其调控网络——2012年全国生物化学与分子生物学学术大会

作者： Lin Chen mingzi wang Chongrong Ke Jianzhong Huang Engineering Research Center of Industrial Microbiology Ministry of Education

Pectianse is widely used in food,textile,paper and pharmaceutical *** the activity of pectianse enzyme has great significance in satisfying the large demand of *** with conventional breeding,genome shuffling only needs one mutagenesis to avoid revertant,and it could select improved strain in a short period of time.

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半导体激光对钝顶螺旋藻形态和生长的影响

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光子学报 2000年第5期29卷 411-414页

作者：陈必链王明兹庄惠如陈荣福建师范大学生物工程学院福州350007 福建师范大学激光研究所福州350007

采用半导体激光 (波长 65 0 nm,功率 40 m W,功率密度 1 3 m W/ cm2 )辐照钝顶螺旋藻 ,辐照时间为 3 0 min、1 5 min、8min.通过测定藻丝形态参量、叶绿素 a、β胡萝卜素 ,研究半导体激光对藻生长的影响 .结果表明 :三个辐照时间都对藻... 详细信息

采用半导体激光 (波长 65 0 nm,功率 40 m W,功率密度 1 3 m W/ cm2 )辐照钝顶螺旋藻 ,辐照时间为 3 0 min、1 5 min、8min.通过测定藻丝形态参量、叶绿素 a、β胡萝卜素 ,研究半导体激光对藻生长的影响 .结果表明 :三个辐照时间都对藻丝形态产生影响 ,使藻丝长、螺旋数、螺旋长发生变化 ;3 0 min辐照组抑制藻体叶绿素 a、β胡萝卜素的合成 ,8min和 1 5 min辐照组促进藻体叶绿素 a和β胡萝卜素的合成 ,β胡萝卜素增幅最高达 1 7.9% .8min促长作用最明显 ,使比生长速率提高1 0 .9% ,1 5 min略有促长作用 ,而 3 0 min则起抑制生长作用 .

关键词：钝顶螺旋藻半导体激光形态生长

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