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暗挖车站施工中拱部预应力锚杆不同支护方向的地层变形研究

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科学技术创新 2024年第6期 183-187页

作者：孟令志中铁第五勘察设计院集团有限公司北京

传统的暗挖车站施工,洞内多设置临时支撑协助抵抗围岩变形,存在施工工期长、拆除困难、费用高等问题。本文以新建暗挖地铁车站为工程背景,通过数值计算的方法对分部台阶法-预应力锚杆支护的大断面隧道施工的地层变形进行了研究。研究结... 详细信息

传统的暗挖车站施工,洞内多设置临时支撑协助抵抗围岩变形,存在施工工期长、拆除困难、费用高等问题。本文以新建暗挖地铁车站为工程背景,通过数值计算的方法对分部台阶法-预应力锚杆支护的大断面隧道施工的地层变形进行了研究。研究结构表明:车站拱顶沉降是暗挖施工中车站沉降的主要方面,拱部支护完成后车站沉降基本趋于稳定。分部台阶法-拱部预应力锚杆竖向布置的施工方法对地层变形控制更有利,拱部预应力锚杆竖向布置,车站开挖完成后拱顶沉降在7.7 mm;拱部预应力锚杆垂直布置,车站开挖完成后拱顶沉降在10.4 mm,拱部预应力锚杆竖向布置对周边建构筑物的变形控制更有利。研究成果可为类似工程提供借鉴。

关键词：暗挖车站预应力锚杆支护方向主动支护地层变形

In-Fiber Thermally Diffused Coupler and Fiber Bragg Grating Inscribed in Twin-Core Fiber for Sensitivity-Enhanced Vector Bending Sensing

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Photonic Sensors 2023年第3期13卷 63-76页

作者： lingzhi meng Hongye WANG Qi XIA Tingting YUAN Xiaotong ZHANG Libo YUAN The Key Lab of In-Fiber Integrated Optics Ministry Education of ChinaHarbin Engineering UniversityHarbin 150001China The Center for Smart Sensing System Julong CollegeShenzhen Technology UniversityShenzhen 518118China Photonics Research Center School of Optoelectronic EngineeringGuilin University of Electronic TechnologyGuilin 541004China

A vector bending fiber sensor based on core-by-core inscribed fiber Bragg gratings in a twin-core fiber has been proposed and experimentally *** in-fiber integrated vector bending sensor is realized by using the thermal diffusion technique to fabricate the *** characteristics of the coupler fabricated by thermal diffusion are simulated and *** inscribing fiber Bragg gratings with different reflection wavelengths in the two cores of a symmetrical twin-core fiber,the curvature sensitivity can be enhanced by tracking the wavelength difference between the fiber Bragg gratings of the two *** measured bending sensitivity of the fiber Bragg grating ranges from–161.6 pm/m^(−1) to+165.5 pm/m^(−1).The differential sensitivity of the two cores is twice that of a conventional single grating,and the temperature-induced crosstalk is also *** bending sensor proposed in this paper has the advantages of high integration,enhancing the sensitivity and two-dimensional orientation recognizability,and reducing temperature crosstalk,which can be a promising candidate for structural health monitoring or wearable artificial electronics applications.

关键词： Digital holographic tomography thermal diffusion bending sensing

Synthesis and anion recognition of neutral receptors based on multiamide calix[4]arene

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Science China Chemistry 2004年第2期47卷 145-151页

作者： LIU Shunying WANG Fajun WEI Lanhua XIAO Wang meng lingzhi HE Yongbing Department of Chemistry Wuhan University Wuhan 430072 China Department of Chemistry Wuhan University Wuhan 430072 China Department of Chemistry Wuhan University Wuhan 430072 China Department of Chemistry Wuhan University Wuhan 430072 China Department of Chemistry Wuhan University Wuhan 430072 China Department of Chemistry Wuhan University Wuhan 430072 China

Two multiamide calix[4]arenes (5, 6) were synthesized and characterized by NMR, MS and elemental analysis. The binding properties of receptors with some anions (π-O2NPhOPO 3 2? , π-O2NPhO?, H2PO 4 ? , Ac?, Cl?, Br? and I?) were studied by UV-Vis spectra. The results indicate that the tetraamide calix[4]arenes (5, 6) have a good selectivity to the anions containing aromatic ring (π-O2NPhOPO3 2?, π-O2NPhO?). The 1 : 1 complexes between host and guest were formed through multiple hydrogen bonding and π-π interactions. The hosts 5 and 6 also show a definite binding ability for the anions (H2PO 4 ? , Ac?, Cl?) that have no ultraviolet absorption, which provides a simple method of spectrum detection for these anions.

关键词： multiple amide calixarene, neutral anion receptor, synthesis, anion recognition, UV-Vis spectrum.

Induced temperature-dependent DNA degradation by C_(60) without photoactivation

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Chinese Science Bulletin 2011年第28期56卷 3100-3107页

作者： WANG Chang LIN Yan WANG Ying LIANG Yong meng lingzhi ZHANG Jie ZHOU QunFang JIANG GuiBin State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Key Laboratory of Subtropical Agriculture and Environment of the Ministry of Agriculture Huazhong Agricultural University Wuhan 430070 China School of Medicine Jianghan University Wuhan 430056 China Department of Chemistry Wuhan University Wuhan 430072 China

This study shows that C_(60) can degrade pBR322 plasmid DNA at room temperature without photoactivation. The degradation was enhanced by increasing incubation temperature, reaction time or C_(60) concentration. We also found that superoxide radical anions (O 2 · ) were formed in the C_(60) solution. Superoxide dismutase significantly inhibited DNA cleavage and O 2 · generation induced by C_(60) . These results suggest that DNA cleavage was caused by the formation of reactive oxygen species induced by C_(60) at room temperature. Furthermore, we demonstrate that the DNA degradation was significantly inhibited by acid amide chemicals such as formamide, and by increased ionic strength of the reaction solution. These results indicate that the DNA conformation stability and the surface properties of C_(60) are important factors regulating DNA degradation. We propose that C_(60) can bind DNA, decrease DNA conformation stability, and induce the formation of reactive oxygen species and DNA cleavage at room temperature. Our results provide a possible explanation for the genotoxicity of C_(60) , which should be considered in future use of this particular nano-material.

关键词：质粒DNA 可降解温度依赖超氧化物歧化酶 DNA裂解 DNA降解 DNA构象 pBR322

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荧光聚合物研究进展

化学进展 2007年第9期19卷 1381-1392页

作者：武照强孟令芝中南民族大学化学与材料科学学院催化材料科学湖北省重点实验室武汉430074 武汉大学化学与分子科学学院武汉430072

本文总结了近年来荧光聚合物的研究进展,主要介绍了荧光聚合物的分类:按其溶解性能可分为非水溶性、水溶性和两亲荧光聚合物3大类;荧光聚合物的合成:荧光化合物为引发剂、荧光化合物为链转移剂、荧光功能单体聚合、荧光化合物与聚合物... 详细信息

本文总结了近年来荧光聚合物的研究进展,主要介绍了荧光聚合物的分类:按其溶解性能可分为非水溶性、水溶性和两亲荧光聚合物3大类;荧光聚合物的合成:荧光化合物为引发剂、荧光化合物为链转移剂、荧光功能单体聚合、荧光化合物与聚合物的化学键合、非荧光功能单体聚合等5种制备荧光聚合物的设计合成方法;荧光聚合物的应用:荧光聚合物在荧光化学传感器、荧光分子温度计、荧光造影、药物载体、荧光探针等方面的应用研究。

关键词：荧光聚合物荧光合成应用

Variation in allelic frequencies at loci associated with kernel weight and their effects on kernel weight-related traits in winter wheat

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The Crop Journal 2019年第1期7卷 30-37页

作者： Teng Li Hongwei Liu Chunyan Mai Guangjun Yu Huili Li lingzhi meng Dawei Jian Li Yang Yang Zhou Hongjun Zhang Hongjie Li National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop Sciences Chinese Academy of Agricultural Sciences Xinxiang Innovation Center for Breeding Technology of Dwarf-Male-Sterile Wheat Zhaoxian Experiment Station Shijiazhuang Academy of Agricultural and Forestry Sciences Institute of Agricultural Science The Fourth Division of the Xinjiang Production and Construction Corps

Knowledge of allelic frequencies at loci associated with kernel weight and effects on kernel weight-related traits is crucial for yield improvement in wheat. Kernel weight-related traits were evaluated in 200 Chinese winter wheat cultivars(lines) grown at the Xinxiang Experimental Station, Chinese Academy of Agricultural Sciences, Xinxiang in Henan Province, for three consecutive years from 2014 to 2016. Alleles associated with kernel weight at nine loci, TaCKX6-D1, TaCwi-A1, TaCWI-4A, TaGS1a, TaGS5-A1, TaGS3-3A, TaGW2-6A, TaSus2-2B, and TaTGW6-A1, were determined for all cultivars(lines). ANOVA showed that genotypes, years and their interactions had significant effects on thousand-kernel weight(TKW), kernel length(KL) and kernel width(KW). The overall mean frequencies of alleles conferring high and low TKW at the nine loci were 65.9% and 33.4%, with the ranges of 37.0%–85.0% and 13.5%–63.0% for single loci. The frequencies of high-TKW alleles were over 50.0% at eight of the loci. Genotypes at each locus with the high-TKW allele had higher TKW than those with the low-TKW allele. The high-TKW allele Hap-H at the TaSus2-2B locus can be preferably used to increase grain yield due to its high TKW(49.32 g). A total of 18 main allelic combinations(ACs) at nine loci were detected. Three ACs(AC1–AC3) had significantly higher TKW than AC6 with high-TKW alleles at all nine loci even though they contained some low-TKW alleles. This indicated that other loci controlling kernel weight were present in the high-TKW cultivars. This work provides important information for parental selection and marker-assisted selection for breeding.

关键词： Allelic frequency Allelic variation Functional markers Triticum aestivum

NETWORK　CROWN　ETHER　POLYMERS　WITH　CENTRIC　FUNCTIONAL　GROUPS．Ⅱ．SYNTHESIS　OF　NETWORK　CROWN　ETHER　POLYMER　WITH　PENDANT　SULFIDE　SIDE　CHAIN　AND　ITS　PLATINUM　COMPLEX

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Chinese Journal of Reactive Polymers 1995年第1期4卷 53-60页

作者： CHEN Yuanyin meng lingzhi YIN Yihua Department of Chemistry Wuhan University Wuhan 430072

Network crewn ether polymer with pendant sulfide side ohain in the networkstructure units has been synthesized via ring- opening copolymerization of β-ethylthioethyl glycidyl ether and diethylene glycol bisglycidyl ether. A kind of active catalyst suitable for this reaction was suggested. The title polymer was found tobe a good ligand for platinous chloride, and the platinous complex could catalyze thehydrosilylation of olefins with triethoxysilane efficiently.

关键词： Crown ether Polymeric crown ether Sulfide platinum complex Hydrosilylation catalyst Platinum

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低压润滑系统对柴油机可靠性和经济性的影响

内燃机与动力装置 2024年第1期41卷 30-34,41页

作者：田少聪申加伟王超李国祥刘洋蒋剑雄孟令智李浩内燃机可靠性国家重点实验室山东潍坊261061 潍柴动力股份有限公司发动机研究院山东潍坊261061 山东大学能源与动力工程学院山东济南250061

为分析低压润滑系统对柴油机可靠性和经济性的影响,以某重型柴油机润滑系统为研究对象,通过仿真、测温试验和台架试验分析降低机油压力对活塞温度、主轴瓦温升、机油温升、燃油消耗率等的影响。仿真结果表明:活塞温度受机油压力和活塞... 详细信息

为分析低压润滑系统对柴油机可靠性和经济性的影响,以某重型柴油机润滑系统为研究对象,通过仿真、测温试验和台架试验分析降低机油压力对活塞温度、主轴瓦温升、机油温升、燃油消耗率等的影响。仿真结果表明:活塞温度受机油压力和活塞喷嘴流量的影响不明显;机油温升受机油压力的影响较大,降低机油压力导致机油温升增大,机油劣化、结焦风险较高;主轴瓦、连杆大头轴瓦温升均小于设计限值。测温试验结果表明:活塞温度受机油压力影响不大,主轴瓦温升符合设计要求。台架试验结果表明:在常用工作区,机油压力由412 kPa降至240 kPa,燃油消耗率最大降幅约为0.9 g/(kW·h)。在满足柴油机可靠性的前提下应用低压润滑系统可提高经济性。

关键词：润滑系统机油压力燃油经济性附件功耗摩擦功

SYNTHESIS AND CATALYTIC ACTIVITY OF PLATINUM COMPLEX OF ACRYLATE TERPOLYMER WITH Se, N BIDENTATE LIGAND

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Chinese Journal of Reactive Polymers 1998年第1期7卷 67-71页

作者： meng lingzhi Qi Liangwei Hu Ling Chen Yuanyin Department of Chemistry Wuhan University Wuhan 430072

Acrylate terpolymer- bound Se, N bidentate ligand was synthesized fromthe side chain chlorine of copolymer and β- dimethylamino -β - hydroxyl diethyl selenoether. The polymer - supported platinum complex exhibited h... 详细信息

关键词： Polymer- supported catalyst Se N platinum complex Hydrosilylation