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Pore structure of low‑permeability coal and its deformation characteristics during the adsorption–desorption of CH4/N2

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International Journal of Coal Science & Technology 2023年第4期10卷 107-127页

作者： Pengfei Ji Haifei Lin Xiangguo Kong Shugang Li Biao Hu Pei Wang Di He songrui yang College of Safety Science and Engineering School of Safety Science and EngineeringXi’an University of Science and Technology58Yanta Mid.Rd.Xi’an 710054ShaanxiChina Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education Xi’an University of Science and TechnologyXi’an 710054ShaanxiChina Western Engineering Research Centre of Mine Gas Intelligent Drainage for Coal Industry Xi’an 710054ShaanxiChina

The pore structure of coal plays a key role in controlling the storage and migration of CH4/*** pore structure of coal is an important indicator to measure the gas extraction capability and the gas displacement efect of N2 *** deformation characteristic of coal during adsorption–desorption of CH4/N2 is an important factor afecting CH4 pumpability and N2 *** pore structure characteristics of low-permeability coal were obtained by fuid intrusion method and photoelectric radiation *** multistage and connectivity of coal pores were ***,a simultaneous test experiment of CH4/N2 adsorption–desorption and coal deformation was carried *** deformation characteristics of coal were clarifed and a coal strain model was ***,the applicability of low-permeability coal to N2 injection for CH4 displacement technology was *** results show that the micropores and transition pores of coal samples are relatively *** pore morphology of coal is dominated by semi-open *** pore structure of coal is highly complex and *** pores,mesopores and macropores of coal have good connectivity,while micropores have poor *** constant triaxial stress,the adsorption capacity of the coal for CH4 is greater than that for N2,and the deformation capacity of the coal for CH4 adsorption is greater than that for N2 *** axial strain,circumferential strain,and volumetric strain during the entire process of CH4 and N2 adsorption/desorption in the coal can be divided into three *** adsorption–desorption deformation has the characteristics of anisotropy and gas-diference.A strain model for the adsorption–desorption of CH4/N2 from coal was established by considering the expansion stress of adsorbed gas on the coal matrix,the compression stress of free gas on the coal matrix,and the expansion stress of free gas on micropore fractures.N2 has good injectability in

关键词： Low-permeability coal Pore structure Adsorption–desorption Deformation characteristics Strain model

Stability and band gap engineering of silica-confined lead halide perovskite nanocrystals under high pressure

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Geoscience Frontiers 2021年第2期12卷 957-963页

作者： Ruijing Fu Yaping Chen Lingrui Wang Zhiwei Ma Pengfei Lv Ying Song songrui yang Guanjun Xiao Bo Zou State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun130012China Key Laboratory of Materials Physics of Ministry of Education School of Physics and EngineeringZhengzhou UniversityZhengzhou450001China

SiO_(2)is the major mineral substance in the upper mantle of the ***,studies of the silica-coated materials under high-pressure are essential to explore the physical and chemical properties of the upper *** silica-confined CsPbBr_(3)nanocrystals(NCs)have recently attracted much attention because of the improved photoluminescence(PL)quantum yield,owing to the protection of silica ***,it remains considerable interest to further explore the relationship between optical properties and the structure of CsPbBr_(3)@SiO_(2)*** systemically studied the structural and optical properties of the CsPbBr_(3)@SiO_(2)NCs under high pressure by using diamond anvil cell(DAC).The discontinuous changes of PL and absorption spectra occurred at~1.40 *** X-ray diffraction(XRD)studies of CsPbBr_(3)@SiO_(2)NCs under high pressure indicated an isostructural phase transformation at about 1.36 GPa,owing to the pressure-induced tilting of the Pb-Br *** isothermal bulk moduli for two phases are estimated about 60.0 GPa and 19.2 GPa by fitting the equation of ***,the transition pressure point of CsPbBr_(3)@SiO_(2)NCs is slightly higher than that of pristine CsPbBr_(3)NCs,which attributed to the buffer effect of coating silica *** results indicate that silica shell is able to enhance the stabilization without changing the relationship between optical properties and structure of CsPbBr_(3)*** results were fascinated to model the rock metasomatism in the upper mantle and provided a new‘lithoprobe’for detecting the upper mantle.

关键词： Core-shell Perovskite CsPbBr3@SiO2 nanocrystals DAC High pressure Isostructural phase transformation

Facile Semiconductor p-n Homojunction Nanowires with Strategic p-Type Doping Engineering Combined with Surface Reconstruction for Biosensing Applications

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Nano-Micro Letters 2024年第10期16卷 15-30页

作者： Liuan Li Shi Fang Wei Chen Yueyue Li Mohammad Fazel Vafadar Danhao Wang yang Kang Xin Liu Yuanmin Luo Kun Liang Yiping Dang Lei Zhao songrui Zhao Zongzhi Yin Haiding Sun iGaN Laboratory School of MicroelectronicsUniversity of Science and Technology of ChinaHefei 230026People's Republic of China Department of Obstetrics and Gynecology The First Affiliated Hospital of Anhui Medical UniversityNo 218 Jixi RoadHefei 230022People's Republic of China Department of Electrical and Computer Engineering McGill University3480 University StreetMontrealQC H3A 0E9Canada Union Hospital Tongji Medical CollegeHuazhong University of Science and TechnologyNo 1277 Jiefang Ave.Wuhan 430022People's Republic of China

Photosensors with versatile functionalities have emerged as a cornerstone for breakthroughs in the future optoelectronic systems across a wide range of *** particular,emerging photoelectrochemical(PEC)-type devices have recently attracted extensive interest in liquid-based biosensing applications due to their natural electrolyte-assisted operating ***,a PEC-type photosensor was carefully designed and constructed by employing gallium nitride(GaN)p-n homojunction semiconductor nanowires on silicon,with the p-GaN segment strategically doped and then decorated with cobalt-nickel oxide(CoNiO_(x)).Essentially,the p-n homojunction configuration with facile p-doping engineering improves carrier separation efficiency and facilitates carrier transfer to the nanowire surface,while CoNiO_(x)decoration further boosts PEC reaction activity and carrier dynamics at the nanowire/electrolyte ***,the constructed photosensor achieves a high responsivity of 247.8 mA W^(-1)while simultaneously exhibiting excellent operating ***,based on the remarkable stability and high responsivity of the device,a glucose sensing system was established with a demonstration of glucose level determination in real human *** work offers a feasible and universal approach in the pursuit of high-performance bio-related sensing applications via a rational design of PEC devices in the form of nanostructured architecture with strategic doping engineering.

关键词： p-n GaN nanowires Strategic p-doping Surface decoration Photoelectrochemical sensor Glucose sensing

三轴应力下原煤吸附CH_(4)/N_(2)变形时空特性

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中国矿业大学学报 2023年第2期52卷 314-328页

作者：林海飞季鹏飞孔祥国李树刚陈晨杨送瑞西安科技大学安全科学与工程学院陕西西安710054 西安科技大学西部矿井开采及灾害防治教育部重点试验室陕西西安710054

为深入研究受载煤体与CH_(4)/N_(2)相互作用时的变形时空特性,开展了三轴应力加载下原煤吸附CH_(4)/N_(2)及其二元混气时的吸附量与吸附变形动态测试试验.结果表明:恒定三轴应力下,原煤对CH_(4)的吸附能力大于N_(2);二元混气吸附量介于... 详细信息

为深入研究受载煤体与CH_(4)/N_(2)相互作用时的变形时空特性,开展了三轴应力加载下原煤吸附CH_(4)/N_(2)及其二元混气时的吸附量与吸附变形动态测试试验.结果表明:恒定三轴应力下,原煤对CH_(4)的吸附能力大于N_(2);二元混气吸附量介于纯气体吸附量之间.三轴应力下原煤吸附膨胀变形存在各向异性.不同注气压力下,原煤轴向/环向应变随吸附时间整体呈现相同演化规律,注气端轴向应变可划分为5个阶段,煤样中部、排气端轴向/环向应变均可划分为3个阶段.相同注气压力下,原煤吸附气体时各测点轴向应变由负转正时间由长到短的顺序为:CH_(4),CH_(4)/N_(2)混气,N_(2).原煤吸附CH_(4),N_(2),CH_(4)/N_(2)混气时,轴向/环向应变随吸附量增加依次呈指数函数、一元一次函数、一元二次函数增长.三轴应力加载后,原煤轴向/环向初始应变呈两端小中间大分布;三轴应力下原煤吸附CH_(4)时膨胀变形能力较强,煤体表面自由能降低量大,煤体强度削减明显,越易发生变形破坏.

关键词：三轴应力注气压力二元混气吸附变形时空特性

冲击载荷瞬时扰动原煤试样破裂演化及瓦斯放散特征研究

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岩石力学与工程学报 2023年第6期42卷 1384-1394页

作者：孔祥国杨送瑞王恩元李树刚林海飞季鹏飞西安科技大学安全科学与工程学院陕西西安710054 中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室江苏徐州221116 西安科技大学教育部西部矿井开采及灾害防治重点实验室陕西西安710054

为了揭示冲击扰动煤体瞬时破坏及瓦斯异常涌出机制,采用含瓦斯煤霍普金森压杆试验系统,开展冲击载荷下三维含瓦斯煤冲击破坏及瓦斯放散测试,研究冲击载荷瞬时扰动下原煤试样破裂演化特征及瓦斯放散规律,分析轴向静载、围压、瓦斯压力和... 详细信息

为了揭示冲击扰动煤体瞬时破坏及瓦斯异常涌出机制,采用含瓦斯煤霍普金森压杆试验系统,开展冲击载荷下三维含瓦斯煤冲击破坏及瓦斯放散测试,研究冲击载荷瞬时扰动下原煤试样破裂演化特征及瓦斯放散规律,分析轴向静载、围压、瓦斯压力和冲击载荷速度4个受载因子对初始最大瓦斯放散速度的影响。结果表明:在低围压或高冲击载荷条件下,三维含瓦斯煤呈现粉碎式破坏,其他试验条件下煤样呈现轴向拉伸破坏模式,裂纹尺度和数量随着轴向静载、围压、瓦斯压力和冲击载荷数值大小而有所不同;冲击载荷作用瞬间,原煤试样瓦斯放散速度瞬时达到最大,随后呈幂指数形式衰减;瓦斯放散持续时长基本在2.00 s之内,随受载因子变化而略有不同;冲击瞬间最大瓦斯放散速度随轴向静载呈指数函数增加,随围压呈线性降低,随瓦斯压力和冲击载荷速度呈线性增加趋势。通过单位尺度受载因子变化对原煤试样最大瓦斯放散速度的贡献度,确定影响煤体瓦斯放散的受载条件重要度为r(冲击载荷)>r(围压)>r(轴向静载)>r(瓦斯压力)。基于乌斯基诺夫式煤粒瓦斯放散模型,建立冲击扰动原煤瓦斯放散模型,对比不同冲击载荷速度下放散模型计算的放散速度理论值与实验值,变化趋势和重合度较好,说明该模型可以反映冲击载荷对原煤瓦斯放散的影响,可以用于采场冲击扰动煤体瓦斯异常放散的预测。研究成果将有助于揭示含瓦斯煤复合动力灾害形成机制,促进采场扰动煤体瓦斯异常涌出治理,保障深部煤炭资源安全高效绿色开采。

关键词：岩石力学冲击载荷含瓦斯煤破裂演化瓦斯放散复合动力灾害

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航站楼离港资源配置优化方法研究综述

科学技术与工程 2023年第5期23卷 1812-1822页

作者：刘继新杨宋瑞雪江灏王志伟南京航空航天大学民航学院南京211106 国家空管飞行流量管理技术重点实验室南京211106

随着民航运输业的高速发展,资源负荷过载导致的航站楼拥堵问题愈发严重,不合理的资源分配策略会对整个民航系统的经济、安全、服务等方面都造成较为严重的负面影响,因此,准确及时地对关键资源进行配置优化成为近年来民航交通运输领域的... 详细信息

随着民航运输业的高速发展,资源负荷过载导致的航站楼拥堵问题愈发严重,不合理的资源分配策略会对整个民航系统的经济、安全、服务等方面都造成较为严重的负面影响,因此,准确及时地对关键资源进行配置优化成为近年来民航交通运输领域的研究热点。首先,介绍了基于资源调度与协同决策的航站楼优化概念的研究现状;其次,分别针对值机、安检、登机口3个主要服务资源总结了目前国内外常用的配置优化策略,分别为:基于静态配置模型和动态配置模型的值机资源配置方法,考虑旅客移动特点和手续办理流程的安检优化方法,基于数学规划方法(多目标优化模型与图论-网络流模型)和计算机仿真技术的登机口分配方法;最后,提出了航站楼服务资源配置优化问题的未来研究方向。

关键词：机场规划与评估航站楼资源配置协同决策优化模型航站楼离港流程

高压下正交相CsPbI_3钙钛矿纳米棒的带隙调制

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高压物理学报 2019年第2期33卷 1-5页

作者：姜红梅曹晔杨松睿马志伟付瑞净石越肖冠军吉林大学物理学院超硬材料国家重点实验室吉林长春130012

全无机卤化物钙钛矿由于其稳定性强,且具有良好的光学性质,是一种很有前途的光电材料。然而,有效地设计其带隙以满足实际应用需求仍是亟待解决的关键问题。通过控制合成的反应时间和温度,对铯铅碘(CsPbI_3)纳米材料进行形貌调控,合成出... 详细信息

全无机卤化物钙钛矿由于其稳定性强,且具有良好的光学性质,是一种很有前途的光电材料。然而,有效地设计其带隙以满足实际应用需求仍是亟待解决的关键问题。通过控制合成的反应时间和温度,对铯铅碘(CsPbI_3)纳米材料进行形貌调控,合成出形貌均一、结晶性良好的棒状CsPbI_3纳米材料。进一步利用金刚石对顶砧,结合原位高压紫外-可见吸收光谱,对CsPbI_3纳米棒在高压下的带隙变化进行研究,发现高压下CsPbI_3纳米棒的带隙减小,带隙的可调控性为纳米材料在光伏电池领域的应用奠定基础。研究结果不仅有助于在原子尺度上建立CsPbI_3纳米棒的结构特性关系,而且为全无机钙钛矿纳米材料的实际应用提供重要线索。

关键词：卤素钙钛矿金刚石对顶砧高压带隙调制

乌鲁木齐市物流企业区位时空演化、影响因素和发展策略研究

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干旱区地理 2024年第7期47卷 1252-1262页

作者：林秋平李松芮杨上广王云云新疆财经大学工商管理学院新疆乌鲁木齐830012 新疆财经大学新疆企业发展研究中心新疆乌鲁木齐830012 华东理工大学商学院上海200237

物流企业的空间布局不仅可以改变现有的物流组织形式,对重塑地区的产业空间格局也会产生重大影响。基于2006—2022年乌鲁木齐市物流企业空间数据,在对乌鲁木齐市物流企业区位时空演变分析的基础上,运用地理探测器和多尺度地理加权回归... 详细信息

物流企业的空间布局不仅可以改变现有的物流组织形式,对重塑地区的产业空间格局也会产生重大影响。基于2006—2022年乌鲁木齐市物流企业空间数据,在对乌鲁木齐市物流企业区位时空演变分析的基础上,运用地理探测器和多尺度地理加权回归进一步探究物流企业区位选择的影响因素及其空间异质性,并提出优化物流企业空间布局的发展策略。结果表明:(1)乌鲁木齐市物流企业存在集聚分布特征,呈现出由“一主轴、一核心”向“三主核、两副核”演变的空间格局。(2)乌鲁木齐市地区间物流企业发展存在显著的正向溢出效应。(3)物流企业区位选择的影响因素中,物流企业数解释力度的均值为66%、地区GDP为48%、人口密度为49%、物流园区距离为28%;其中物流企业数和物流园区距离是空间异质性因素且其系数在空间上变化较大,地区GDP是具有正向影响的全局变量,人口密度是具有负向影响的全局变量。研究结果不仅拓展了企业区位理论的研究,而且丰富了研究案例,同时可以为乌鲁木齐市进行物流产业规划和高质量建设丝绸之路经济带商贸物流中心提供理论依据和实践参考。

关键词：物流企业空间演变多尺度地理加权回归影响因素乌鲁木齐市

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脱硫石膏改良盐碱土壤综合效果评价研究

土壤学报 2024年第3期61卷 699-713页

作者：姜展博宁松瑞王全九西安理工大学省部共建西北旱区生态水利国家重点实验室西安710048

为探究区域脱硫石膏改良盐碱土壤的综合效果,通过文献调研统计分析了施加量在0~60 t·hm^(–2)范围内的脱硫石膏,对土壤pH、交换性钠百分率、浸提液电导率和作物产量的变化特征。基于灰色关联分析法和熵权法建立了以脱硫石膏施加量为自... 详细信息

为探究区域脱硫石膏改良盐碱土壤的综合效果,通过文献调研统计分析了施加量在0~60 t·hm^(–2)范围内的脱硫石膏,对土壤pH、交换性钠百分率、浸提液电导率和作物产量的变化特征。基于灰色关联分析法和熵权法建立了以脱硫石膏施加量为自变量的盐碱土壤综合改良评价模型。结果表明:施用脱硫石膏可降低土壤pH和交换性钠百分率,提高作物产量(油葵、苜蓿、玉米、水稻、小麦、枸杞和甜高粱),但增加了土壤浸提液的电导率值。随着脱硫石膏施加量的增加,土壤pH和交换性钠百分率的降低率及作物产量的增加率呈先增加后减少的趋势,而土壤浸提液电导率的增加率呈增加的趋势。在中度或重度盐碱土壤为获得作物高产,脱硫石膏施加量不宜超过30 t·hm^(–2)。为综合分析脱硫石膏改良盐碱土壤的效果,本文基于熵权—灰色关联度评价模型,分析脱硫石膏最佳施加量。轻、中度盐碱土施加18~22 t·hm^(–2)的脱硫石膏;重度盐碱土施加23~29 t·hm^(–2)的脱硫石膏可取得良好的改土增产效果。研究成果为脱硫石膏改良盐碱土壤提供参考依据。

关键词：土壤改良作物产量 pH 交换性钠百分率土壤电导率