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三维激光扫描技术在复杂地形中异形建筑竣工测量的应用

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北京测绘 2024年第4期38卷 555-559页

作者：马新建北京市测绘设计研究院北京100038 城市空间信息工程北京市重点实验室北京100038

随着城市化进程的不断加速,异形建筑多样化、规划管理复杂化成了必然趋势,传统二维(2D)竣工测量已难以满足规划管理的要求。本文以北京冬奥雪车雪橇项目为例,从数据采集、数据处理两方面探讨三维(3D)激光扫描技术在复杂地形中异形建筑... 详细信息

随着城市化进程的不断加速,异形建筑多样化、规划管理复杂化成了必然趋势,传统二维(2D)竣工测量已难以满足规划管理的要求。本文以北京冬奥雪车雪橇项目为例,从数据采集、数据处理两方面探讨三维(3D)激光扫描技术在复杂地形中异形建筑竣工测量的应用。经求取3D扫描数据与设计尺寸的较差,扫描值与设计值点位差值能够满足建筑竣工测量需求。3D激光扫描技术在复杂地形中异形建筑竣工测量中具有较好的应用价值,能够在特定的规划验收中推广使用。

关键词：三维激光扫描复杂地形异形建筑竣工测量

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浅埋煤层房采破坏区充填复采技术研究与应用

煤炭工程 2024年第4期56卷 16-21页

作者：马金奎郑立永高新建常云博李强北京天地华泰矿业管理股份有限公司北京100013 中国矿业大学(北京) 能源与矿业学院北京100083

针对浅埋煤层前期开采遗留的大量房采破坏区严重影响现阶段工作面正常开采的问题,以五家沟煤矿5-1号煤层15301工作面的赋存情况和开采条件为研究背景,采用煤矿探巷机器人和机载三维激光扫描系统,探查出靠近15301辅运巷道三个房采区的情... 详细信息

针对浅埋煤层前期开采遗留的大量房采破坏区严重影响现阶段工作面正常开采的问题,以五家沟煤矿5-1号煤层15301工作面的赋存情况和开采条件为研究背景,采用煤矿探巷机器人和机载三维激光扫描系统,探查出靠近15301辅运巷道三个房采区的情况,对房采破坏区失稳机理进行研究,确定了破坏区支护强度,通过对充填材料不同配比实验,同时结合填充效果的探查结果,提出了安全快速通过充填区技术。研究与实践表明:当破坏区支护强度P_(k)≥2.1 MPa时,可避免房采破坏区失稳;确定了满足五家沟煤矿充填的主体材料为充填料Ⅰ,其中,水泥、粉煤灰掺入比例为3∶7,水灰比为1∶(0.8~1.2);对房采区进行充填后,利用安全快速通过充填区技术,顺利完成了15301工作面房采破坏区充填复采,取得了良好的技术与经济效益,为类似条件下的浅埋煤层开采提供技术借鉴。

关键词：浅埋煤层房采破坏区充填材料充填复采分层充填

An experimental study on heat transfer process of multiple mist impinging jets

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Baosteel Technical Research 2011年第4期5卷 49-53页

作者： LIU Huafei XIANG Shunhua ma xinjian Auto Steel Division Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China Equipment Division Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China

Mist jet impingement cooling is an enhanced heat transfer method widely used after the continuous galvanizing process. The key of a successful design and operation of the mist jet impingement cooling system lies in mastering heat transfer coefficients. The heat transfer coefficients of high temperature steel plates cooled with multiple mist impinging jets were experimentally investigated, and the effects of gas and water flow rates on heat transfer coefficients were studied. The test results illustrate that the gas flow rate has little effect on the mist heat transfer rate. It is also found that the water flow rate has a great impact on the heat transfer coefficient. When the water flow rate ranges from 0.96m3/h to 1.59 m3/h, an increase in the rate will produce a higher heat transfer coefficient with a maximum of 5650 W/（m2 · K）. Compared with the conventional gas jet cooling, the heat transfer coefficient of the mist jet cooling will be much higher, which can effectively strengthen the after-pot cooling.

关键词： multiple mist jet jet impingement heat transfer after-pot cooling

Cationic quaternary ammonium-stabilized Nb oxoclusters catalyze reductive amination of carbon dioxide with hydrosilane

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Green Chemical Engineering 2022年第2期3卷 146-156页

作者： Yuan ma xinjian Wei Jian Fang Qingpo Peng Wen Xu Zhenshan Hou Key Laboratory for Advanced materials Research Institute of Industrial CatalysisSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai200237China

The N-formylation of amines with CO_(2)and hydrosilanes is an emerging yet important reaction in fine chemical industry.Herein,we have reported a methyltrioctylammonium cation(TOma)stabilized Nb oxocluster catalyst that can effectively realize two electron reduction of CO_(2)and form C-N bond simultaneously,leading to the corresponding formamides.The oxocluster catalyst exhibits excellent catalytic activity to transform secondary and primary amines into the corresponding formamides,with the conversion ranging from 81.5%to 99.2%under room temperature conditions.Furthermore,the Nb oxocluster catalyst shows the unique characteristics of ionic liquids,and it is highly robust and easy to be recycled for five times with negligible loss of catalytic activity.On the basis of the activity tests and structure characterization of Nb catalysts,it was found that TOma cation played an important role in modulating the Nb oxocluster with high stability and uniform dispersion.The mechanism studies demonstrate that the formylation reaction proceeds through the formation of silyl formate intermediate rather than carbamate,and the Lewis base site of negative oxygen atoms from polyoxoniobate anions can exert a favorable impact on activation both CO_(2)and Si-H bond of PhSiH 3,allowing that N-formylation reaction proceed smoothly under very mild reaction conditions.

关键词： CO_(2) Amine Hydrosilane N-formylation Polyoxoniobate

浅埋深厚硬基岩综放工作面覆岩运移破坏规律研究

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煤炭工程 2024年第6期56卷 144-151页

作者：常云博薛吉胜郑立永马金奎高新建朱有彬北京天地华泰矿业管理股份有限公司中煤科工开采研究院有限公司

为揭示浅埋厚煤层综放工作面顶板来压及覆岩运移特征，在五家沟矿15304工作面辅运巷内施工钻孔，现场重探顶板岩层分布及关键层位置，并对来压期间的顶板不同层位的裂隙发育特征及破断位置进行监测，分析工作面支架工作阻力分布规律。... 详细信息

为揭示浅埋厚煤层综放工作面顶板来压及覆岩运移特征，在五家沟矿15304工作面辅运巷内施工钻孔，现场重探顶板岩层分布及关键层位置，并对来压期间的顶板不同层位的裂隙发育特征及破断位置进行监测，分析工作面支架工作阻力分布规律。结果表明：顶板关键层控制工作面覆岩运移及工作面矿压显现，关键层破断引起覆岩剧烈运动及采场剧烈来压，采空区覆岩垮落以规则的弧线状向上发育，其中由顶板中间底部向上部、两端逐渐递减，覆岩破坏形态易形成“马鞍形”。由于亚关键层厚度及强度较大，导致15304工作面推进90 m时亚关键层才发生破断引起初次来压，周期来压过程中导水裂隙带逐步向上发育到主关键层附近，厚硬关键层阻断了顶板裂隙继续向上发育。该工作面初次来压步距90 m,周期来压来压步距22 m;覆岩垮落带最大发育高度为44 m左右，导水裂缝带最大发育高度为58 m。

关键词：浅埋煤层覆岩运移厚关键层覆岩“两带” 矿压监测

Amplification of Flood Risks by the Compound Effects of Precipitation and Storm Tides Under the Nonstationary Scenario in the Coastal City of Haikou,China

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International Journal of Disaster Risk Science 2022年第4期13卷 602-620页

作者： Hongshi Xu Xi Zhang xinjian Guan Tianye Wang Chao ma Denghua Yan Yellow River Laboratory Zhengzhou UniversityZhengzhou 450001China Institute of Hydropower and Hydroinformatics Dalian University of TechnologyDalian 116024China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300350China China Institute of Water Resources and Hydropower Research Beijing 100038China

In the context of climate change,coastal cities are at increased risk of extreme precipitation and sea level rise,and their interaction will aggravate coastal floods.Understanding the potential change of compound floods is valuable for flood risk reduction.In this study,an integrated approach coupling the hydrological model and copulabased design of precipitation and storm tides was proposed to assess the compound flood risk in a coastal city—Haikou,China.The copula model,most-likely weight function,and varying parameter distribution were used to obtain the combined design values of precipitation and storm tides under the nonstationary scenario,which were applied to the boundary conditions of the 1D-2D hydrological model.Subsequently,the change of the bivariate return periods,design values,and compound flood risks of precipitation and storm tides were investigated.The results show that the bivariate return period of precipitation and storm tides was reduced by an average of 34%under the nonstationary scenario.The maximum inundation areas and volumes were increased by an average of 31.1%and 45.9%respectively in comparison with the stationary scenario.Furthermore,we identified that the compound effects of precipitation and storm tides would have a greater influence on the flood risk when the bivariate return period is more than 50 years,and the peak time lag had a significant influence on the compound flood risk.The proposed framework is effective in the evaluation and prediction of flood risk in coastal cities,and the results provide some guidance for urban disaster prevention and mitigation.

关键词： Copula function Flood risk Haikou City Nonstationary scenario Urban hydrological model

肩部控制训练联合神经松动术对脑卒中偏瘫患者肩痛及上肢功能的效果

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中国康复理论与实践 2024年第1期30卷 81-86页

作者：胡永林马颖窦超陆安民江小鸽宋新建肖玉华南通市第二人民医院/南通大学附属南通康复医院康复医学科江苏南通市226002

目的观察肩部控制训练基础上联合神经松动术治疗脑卒中偏瘫患者肩痛的效果。方法2020年1月至2021年11月,南通市第二人民医院脑卒中偏瘫患者43例,随机分为对照组(n=21)和治疗组(n=22)。对照组采用肩部控制训练,治疗组加用神经松动术。治... 详细信息

目的观察肩部控制训练基础上联合神经松动术治疗脑卒中偏瘫患者肩痛的效果。方法2020年1月至2021年11月,南通市第二人民医院脑卒中偏瘫患者43例,随机分为对照组(n=21)和治疗组(n=22)。对照组采用肩部控制训练,治疗组加用神经松动术。治疗前、治疗4周后,采用疼痛数字表法(NRS)和Fugl-Meyer评定量表上肢部分(Fma-UE)进行评定。结果对照组脱落1例,治疗组脱落2例。两组治疗后NRS和Fma-UE评分显著改善(|t|>7.898,P2.337,P<0.05)。结论肩部控制训练联合神经松动术能显著缓解脑卒中偏瘫患者的肩痛,改善其上肢运动功能。

关键词：脑卒中偏瘫肩痛神经松动术肩部控制训练

川中充西地区雷三^(2)亚段泥灰岩储层精细预测研究

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成都理工大学学报（自然科学版） 2024年第2期51卷 247-257页

作者：张豪辛勇光马华灵孙豪飞朱心健谢忱朱可丹谷明峰中国石油杭州地质研究院杭州310023 中国石油勘探开发研究院四川盆地研究中心成都610041 中国石油西南油气田公司成都610041

川中充西地区多口钻井在雷三2亚段泥灰岩储层中油气显示好,测井解释储层发育,展示了良好的勘探潜力。为准确预测雷三2亚段泥灰岩储层纵横向分布,为下一步勘探部署提供指导,首先利用储层合成记录标定明确储层地球物理响应特征;接着围绕... 详细信息

川中充西地区多口钻井在雷三2亚段泥灰岩储层中油气显示好,测井解释储层发育,展示了良好的勘探潜力。为准确预测雷三2亚段泥灰岩储层纵横向分布,为下一步勘探部署提供指导,首先利用储层合成记录标定明确储层地球物理响应特征;接着围绕岩性和储层分别开展岩石物理分析,优选盐岩和泥灰岩储层的敏感参数,利用地震波形指示模拟预测盐岩的分布;最后利用波形指示反演预测泥灰岩储层的分布。结果表明:雷三2亚段顶部盐岩对应强波峰反射,储层底界对应弱波峰反射,储层与盐岩存在明显的波阻抗重叠,而盐岩与其他岩性在密度上存在明显差异,当去除盐岩的影响后,利用波阻抗可以较好地区分储层和非储层。因此,在利用波形指示模拟识别盐岩分布后,地震波形指示反演可有效识别储层。充西三维区储层大面积发育,厚30~60 m,发育岩性圈闭16个,总面积124 km 2,是下一步富有机质泥灰岩储层的现实勘探方向。

关键词：川中地区雷三2亚段盐岩泥灰岩储层波形指示反演波形指示模拟

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Broadband high-efficiency polymerized liquid crystal metasurfaces with spin-multiplexed functionalities in the visible

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Photonics Research 2022年第6期10卷 1380-1393页

作者： xinjian LU XIAOYIN LI YINGHUI GUO MINGBO PU JIANGYU WANG YAXIN ZHANG XIONG LI XIAOLIANG ma XIANGANG LUO State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China School of Optoelectronics University of Chinese Academy of SciencesBeijing 100049China Vector Light Field Research Center Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610054China

Traditional optical components are usually designed for a single functionality and narrow operation band,leading to the limited practical applications.To date,it is still quite challenging to efficiently achieve multifunctional performances within broadband operating bandwidth via a single planar optical element.Here,a broadband high-efficiency polarization-multiplexing method based on a geometric phase polymerized liquid crystal metasurface is proposed to yield the polarization-switchable functionalities in the visible.As proofs of the concept,two broadband high-efficiency polymerized liquid crystal metalenses are designed to obtain the spin-controlled behavior from diffraction-limited focusing to sub-diffraction focusing or focusing vortex beams.The experimental results within a broadband range indicate the stable and excellent optical performance of the planar liquid crystal metalenses.In addition,low-cost polymerized liquid crystal metasurfaces possess unique superiority in large-scale patterning due to the straightforward processing technique rather than the point-by-point nanopatterning method with high cost and low throughput.The high-efficiency liquid crystal metasurfaces also have unrivalled advantages benefiting from the characteristic with low waveguide absorption.The proposed strategy paves the way toward multifunctional and high-integrity optical systems,showing great potential in mobile devices,optical imaging,robotics,chiral materials,and optical interconnections.

关键词： polarization interconnection waveguide