检索结果-南通市图书馆

Estimating pore volume compressibility by spheroidal pore modeling of digital rocks

在线全文

学校读者我要写书评

暂无评论

Petroleum Exploration and Development 2020年第3期47卷 603-612页

作者： SUI Weibo QUAN Zihan HOU Yanan cheng haoran State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China College of Petroleum Engineering China University of PetroleumBeijing 102249China Research Institute of Tsinghua University in Shenzhen Shenzhen 518057China ICORE GROUP Shenzhen 518057China

The real pores in digital cores were simplified into three abstractive types,including prolate ellipsoids,oblate ellipsoids and *** three-dimensional spheroidal-pore model of digital core was established based on mesoscopic mechanical *** constitutive relationship of different types of pore microstructure deformation was studied with Eshelby equivalent medium theory,and the effects of pore microstructure on pore volume compressibility under elastic deformation conditions of single and multiple pores of a single type and mixed types of pores were *** results showed that the pore volume compressibility coefficient of digital core is closely related with porosity,pore aspect ratio and volumetric proportions of different types of pores.(1)The compressibility coefficient of prolate ellipsoidal pore is positively correlated with the pore aspect ratio,while that of oblate ellipsoidal pore is negatively correlated with the pore aspect ratio.(2)At the same mean value of pore aspect ratio satisfying Gaussian distribution,the more concentrated the range of pore aspect ratio,the higher the compressibility coefficient of both prolate and oblate ellipsoidal pores will be,and the larger the deformation under the same stress condition.(3)The pore compressibility coefficient increases with porosity.(4)At a constant porosity value,the higher the proportion of oblate ellipsoidal and spherical pores in the rock,the more easier for the rock to deform,and the higher the compressibility coefficient of the rock is,while the higher the proportion of prolate ellipsoidal pores in the rock,the more difficult it is for rock to deform,and the lower the compressibility coefficient of the rock *** calculating pore compressibility coefficient of ten classical digital rock samples,the presented analytical elliptical-pore model based on real pore structure of digital rocks can be applied to calculation of pore volume compressibility coefficient of digital rock sample.

关键词： digital rock mesomechanics microscopic deformation spheroidal pore model pore volume compressibility coefficient calculation method

同方期刊数据库

Ni Flower/MXene-Melamine Foam Derived 3D Magnetic/Conductive Networks for Ultra-Efficient Microwave Absorption and Infrared Stealth

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2022年第4期14卷 142-157页

作者： haoran cheng Yamin Pan Xin Wang Chuntai Liu Changyu Shen Dirk W.Schubert Zhanhu Guo Xianhu Liu Key Laboratory of Advanced Material Processing&Mold(Ministry of Education) National Engineering Research Center for Advanced Polymer Processing TechnologyCollege of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450002People’s Republic of China Institute of Polymer Materials Friedrich-Alexander-University Erlangen-NurembergMartensstr.791058 ErlangenGermany Integrated Composites Laboratory(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA

The development of multifunctional and efficient electromagnetic wave absorbing materials is a challenging research ***,the magnetized Ni flower/MXene hybrids are successfully assembled on the surface of melamine foam(MF)through electrostatic self-assembly and dip-coating adsorption process,realizing the integration of microwave absorption,infrared stealth,and flame ***,the Ni/MXene-MF achieves a minimum reflection loss(RLmin)of−62.7 dB with a corresponding effective absorption bandwidth(EAB)of 6.24 GHz at 2 mm and an EAB of 6.88 GHz at 1.8 *** electromagnetic wave absorption is attributed to the three-dimensional magnetic/conductive networks,which provided excellent impedance matching,dielectric loss,magnetic loss,interface polarization,and multiple *** addition,the Ni/MXene-MF endows low density,excellent heat insulation,infrared stealth,and flame-retardant *** work provided a new development strategy for the design of multifunctional and efficient electromagnetic wave absorbing materials.

关键词： Ni-MXene/Melamine foam Microwave absorption Heat insulation Infrared stealth Flame-retardant

Anti-fatigue activity and mechanism of crocetin loaded nanoliposome in acute exercise-treated mice

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第6期13卷 3361-3370页

作者： Jian Nan Jinglei Li Haishan Wu haoran cheng Hyun Jin Park Qingsheng Zhao Liu Yang School of Food and Biological Engineering Hefei University of TechnologyHefei 230009China Engineering Research Center of Bio-process Ministry of EducationHefei University of TechnologyHefei 230009China School of Life Sciences and Biotechnology Korea UniversitySeoul 02841South of Korea National Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Crocetin displays strong antioxidant,anti-inflammatory and anti-depression activity which is promising to relieve symptoms of *** a carotenoid,crocetin is difficult to dissolve in water and highly unstable against many environmental *** is used to encapsulate crocetin to improve its water *** the present study,the antifatigue activities and potential mechanism of crocetin loaded nanoliposome(CLN)was extensively *** potential antifatigue pathway of CLN was ***,impact of CLN on the gut microbiota structure was examined which contributes to its antifatigue *** significantly increases exhaustive swimming time of fatigue mice,decreases the blood contents of lactic,blood urea nitrogen(BUN)and malondialdehyde(MDA).At the same time,CLN improves the activity of glutathione peroxidase(GSH-Px)and succinate dehydrogenase(SDH)enzyme,attenuates the oxidant stress in *** activates the adenosine monophosphate-activated kinase(AMPK)/peroxisome proliferator-activated receptor gamma coactivator-1α(PGC-1α)signaling pathway of fatigue mice,increases the mRNA expression of ATP *** also increases mRNA expression of mitochondrial transcription factor A(TFAM)which promotes mitochondrial ***,CLN ameliorates the gut microbiota structure by increasing the abundance of genus such as Lactobacillus in fatigue *** summary,CLN exerts strong anti-fatigue properties by decreasing the oxidant stress and the contents of harmful metabolites,augmenting the production of ATP,and potentially ameliorating the gut microbiota structure.

关键词： Crocetin Nanoliposome Fatigue AMPK/PGC-1αpathway Gut microbiota

Cost-benefit Analysis of Land Development Projects Based on Fuzzy Comprehensive Evaluation Model

在线全文

学校读者我要写书评

暂无评论

Asian Agricultural Research 2019年第6期11卷 12-14页

作者： Zhengben DAI Xingchen HU haoran cheng School of Finance Anhui University of Finance & Economics

Ecological and environmental issues have always been the focus of government work. The economic losses caused by air pollution,water pollution,noise pollution and solid waste pollution caused by land use development projects are estimated,and the total population economic losses are incorporated into project costing. Using the analytic hierarchy process,four benefit indicators and five cost indicators are selected for constructing a fuzzy comprehensive evaluation model to evaluate the cost-benefit of projects of different scales. The projects of different scales are ranked according to the level of comprehensive scores. The results show that large-scale projects are cost-effective and stable over the long term,and there are differences in the main sources of pollution-caused economic losses for projects of different scales. At last,reasonable policy suggestions are made to relevant planning and management personnel.

关键词： Pollution-caused economic losses Cost-benefit Fuzzy comprehensive evaluation

Correction to: Ni Flower/MXene-Melamine Foam Derived 3D Magnetic/Conductive Networks for Ultra-Efficient Microwave Absorption and Infrared Stealth

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2022年第7期14卷 177-178页

The original version of this article unfortunately contained some *** corrections are updated as follows:Error 1:We found that Equations 3,4 and 6 were wrong in the published paper:Error 2:In the page 7,“Since N Ni/MXene-MF possessed numer-ous heterogeneous interfaces and abundant functional groups,the dielectric loss mechanism was explored.”

关键词： Infrared correction dielectric

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

南京包山式城墙典型病害及整体坍塌预警分析

文物保护与考古科学 2023年第2期35卷 143-152页

作者：程浩然敬登虎东南大学土木工程学院江苏南京211189

南京城墙作为现存的世界第一城垣,对其安全性进行科学评估尤为重要。包山式城墙为南京城墙的主要形式之一,由于其与土体相连,受力特点不同于常规的自承重城墙。本研究整理了包山式城墙的6种典型病害,并提出了包山式城墙的数值建模方法,... 详细信息

南京城墙作为现存的世界第一城垣,对其安全性进行科学评估尤为重要。包山式城墙为南京城墙的主要形式之一,由于其与土体相连,受力特点不同于常规的自承重城墙。本研究整理了包山式城墙的6种典型病害,并提出了包山式城墙的数值建模方法,将其简化为城墙-粘结界面-土体的模型。利用ABAQUS软件,结合工程实例模拟土坡强度折减后包山式城墙的鼓胀。研究结果表明:随着土体的强度下降,包山式城墙的位移不断增大形成鼓胀现象,最终发生倾覆坍塌,可通过墙体底部拉应力-顶点位移曲线中的明显拐点确立监测变形预警值;在此基础上,讨论土坡高度对整体坍塌的影响,并给出放坡角度的合理取值;城墙底部的积水浸泡会导致底部强度折减进而发生相对错动,可通过底部墙体达到极限抗拉强度时的最大相对位移确立监测变形预警值。最后,提出了包山式城墙的修缮保护建议。

关键词：包山式城墙典型病害鼓胀渗水预警分析

在线全文

学校读者我要写书评

暂无评论

碱液电解槽建模与宽范围运行控制

电力自动化设备 2024年第11期44卷 17-23页

作者：胡致远程浩然夏杨红韦巍浙江大学电气工程学院浙江杭州310027

在碱液电解制氢中,碱液电解槽(AWE)的低载性能差,难以宽范围跟踪波动性可再生能源出力。基于工业AWE的内部结构和工作原理,建立了一种新的工业AWE等效电路模型,揭示了AWE低载低效率的内在机理,并提出了一种多模态自寻优(MMSO)控制策略... 详细信息

在碱液电解制氢中,碱液电解槽(AWE)的低载性能差,难以宽范围跟踪波动性可再生能源出力。基于工业AWE的内部结构和工作原理,建立了一种新的工业AWE等效电路模型,揭示了AWE低载低效率的内在机理,并提出了一种多模态自寻优(MMSO)控制策略及其原理样机。在低载时施加低频脉冲电流以提高制氢效率,从而实现工业AWE的宽范围运行。基于10 kW的AWE实验平台,验证了所提模型的正确性以及所提MMSO控制策略对AWE在低载范围内效率的提升具有显著的效果。

关键词：制氢碱液电解槽变流器宽范围运行效率提升

基于多源地理数据融合的黑河中游土地多功能性时空格局与权衡研究

在线全文

学校读者我要写书评

暂无评论

干旱区地理 2021年第1期44卷 208-220页

作者：程浩然蒙吉军朱利凯北京大学城市与环境学院地表过程分析与模拟教育部重点实验室北京100871 临沂大学资源环境学院山东临沂276000

土地多功能利用是提高土地利用效率、缓解人地矛盾、促进区域可持续发展的重要途径。研究构建了“生产-生活-生态”功能的土地多功能性评价指标体系,基于3 km×3 km格网,融合了遥感、统计、POI等多源地理数据,利用投影寻踪模型对黑河中... 详细信息

土地多功能利用是提高土地利用效率、缓解人地矛盾、促进区域可持续发展的重要途径。研究构建了“生产-生活-生态”功能的土地多功能性评价指标体系,基于3 km×3 km格网,融合了遥感、统计、POI等多源地理数据,利用投影寻踪模型对黑河中游土地多功能性进行评价,通过变量相关分析和双变量局部空间自相关分析,揭示了土地多功能权衡与协同关系,并采用RGB三通道合成与二阶聚类分析相结合进行土地功能分区。结果表明:(1)黑河中游在不同利用方式下呈现不同功能,在走廊平原区土地功能以生产功能为主导,生活功能和生态功能为辅。生产功能在走廊绿洲农业区优势明显,生活功能高值区集中于城镇等基础设施条件较好的地区,祁连山、龙首山发挥着生态屏障作用。(2)研究时段内,土地多功能性稳中增强。土地多功能性与一级功能的空间格局保持稳定,土地功能间协调性普遍增强,不同功能在空间上日益重叠。(3)按照主导利用方向,土地可划分为以农业生产与城镇空间为主体的重点开发区、优化开发区和适度开发区,以及以生态空间为主的生态屏障区、生态缓冲区和生态修复区。(4)土地多功能利用仍有提升空间,尤其要加强对非主导功能的关注,协调功能间的固有矛盾;统筹推进生态修复,关注自然资本增值,从构建区域绿水青山的格局挖掘土地价值新的增长点。

关键词：土地多功能性多源地理数据时空格局权衡与协同功能分区黑河中游

玉溪市县域旅游客源市场分析及预测——以华宁县为例

在线全文

学校读者我要写书评

暂无评论

玉溪师范学院学报 2019年第6期35卷 99-107页

作者：程浩然玉溪师范学院商学院云南玉溪653100

以华宁县为例,对云南省玉溪市县域旅游客源市场进行分析和预测.通过文献调查法、问卷调查法收集华宁县旅游客源市场的相关资料,对旅游客源市场和市场竞争进行分析;采用直线趋势延伸预测法和一元线性回归分析法分别对客源市场规模和旅游... 详细信息

以华宁县为例,对云南省玉溪市县域旅游客源市场进行分析和预测.通过文献调查法、问卷调查法收集华宁县旅游客源市场的相关资料,对旅游客源市场和市场竞争进行分析;采用直线趋势延伸预测法和一元线性回归分析法分别对客源市场规模和旅游收入进行分析和预测.从分析结果看,玉溪市各县区核心旅游客源市场是昆明和玉溪,未来要注重节日旅游产品开发、突出县域旅游主题形象,重点开发核心家庭市场、老年市场和研学市场.

关键词：华宁县县域旅游旅游客源市场分析与预测