检索结果-南通市图书馆

Contact angle and stability of interfacial nanobubble supported by gas monolayer

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

Fundamental Research 2024年第1期4卷 35-42页

作者： Haichang Yang Yaowen Xing fanfan Zhang Xiahui Gui Yijun Cao Chinese National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China Henan Province Industrial Technology Research Institution of Resources and Materials Zhengzhou UniversityZhengzhou 450001China

Since solid-liquid interfacial nanobubbles(INBs)were first imaged,their long-term stability and large contact angle have been perplexing scientists.This study aimed to investigate the influence of internal gas density and external gas monolayers on the contact angle and stability of INB using molecular dynamics simulations.First,the contact angle of a water droplet was simulated at different nitrogen densities.The results showed that the contact angle increased sharply with an increase in nitrogen density,which was mainly caused by the decrease in solid-gas interfacial tension.However,when the nitrogen density reached 2.57 nm^(-3),an intervening gas monolayer(GML)was formed between the solid and water.After the formation of GML,the contact angle slightly increased with increasing gas density.The contact angle increased to 180°when the nitrogen density reached 11.38 nm^(-3),indicating that INBs transformed into a gas layer when they were too small.For substrates with different hydrophobicities,the contact angle after the formation of GML was always larger than 140°and it was weakly correlated with substrate hydrophobicity.The increase in contact angle with gas density represents the evolution of contact angle from macro-to nano-bubble,while the formation of GML may correspond to stable INBs.The potential of mean force curves demonstrated that the substrate with GML could attract gas molecules from a longer distance without the existence of a potential barrier compared with the bare substrate,indicating the potential of GML to act as a gas-collecting panel.Further research indicated that GML can function as a channel to transport gas molecules to INBs,which favors stability of INBs.This research may shed new light on the mechanisms underlying abnormal contact angle and long-term stability of INBs.

关键词： Interfacial tension Hydrophobicity Potential of mean force Gas density Molecular dynamics simulations

Numerical Simulation on Production Trials by Using Depressurization for Typical Marine Hydrate Reservoirs:Well Type and Formation Dip

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

Journal of Ocean University of China 2024年第3期23卷 661-675页

作者： QIN fanfan SUN Jiaxin GU Yuhang CAO Xinxin MAO Peixiao NING Fulong JIANG Guosheng National Center for International Research on Deep Earth Drilling and Resource Development Faculty of EngineeringChina University of GeosciencesWuhan 430074China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

Natural gas hydrate has huge reserves and is widely distributed in marine environment.Its commercial development is of great significance for alleviating the contradiction between energy supply and demand.As an efficient research method,numerical simulation can provide valuable insights for the design and optimization of hydrate development.However,most of the current production models simplify the reservoir as a two-dimensional(2D)horizontal layered model,often ignoring the impact of formation dip angle.To improve the accuracy of production prediction and provide theoretical support for the optimization of production well design,two three-dimensional(3D)geological models with different dip angles based on the geological data from two typical sites are constructed.The vertical well,horizontal well and multilateral wells are deployed in these reservoirs with different permeabilities to perform production trial,and the sensitivity analysis of dip angles is also carried out.The short-term production behaviors in high and low permeability reservoirs with different dip angles are exhibited.The simulation results show that 1)the gas and water production behaviors for different well types in the two typical reservoirs show obviously different variation laws when the short-term depressurization is conducted in the inclined formation;2)the inclined formation will reduce the gas production and increase the water extraction,and the phenomena becomes pronounced as the dip angle increases,particularly in the low-permeability reservoirs;3)and the impact of formation dip on hydrate recovery does not change significantly with the variation of well type.

关键词： natural gas hydrate inclined formation depressurization production well type

Explainable artificial intelligence models for mineral prospectivity mapping

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年

作者： Renguang ZUO Qiuming CHENG Ying xu fanfan YANG Yihui XIONG Ziye WANG Oliver P.KREUZER State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan School of Earth Sciences and Engineering Sun Yat-sen University Corporate Geoscience Group (CGSG) PO Box 5128 Rockingham Beach Economic Geology Research Centre (EGRU) College of Science and Engineering James Cook University

Mineral prospectivity mapping(MPM) is designed to reduce the exploration search space by combining and analyzing geological prospecting big data. Such geological big data are too large and complex for humans to effectively handle and interpret. Artificial intelligence(AI) algorithms, which are powerful tools for mining nonlinear mineralization patterns in big data obtained from mineral exploration, have demonstrated excellent performance in MPM. However, AI-driven MPM faces several challenges, including difficult interpretability, poor generalizability, and physical inconsistencies. In this study, based on previous studies, we devised a novel workflow that aims to constructing more transparent and explainable artificial intelligence(XAI) models for MPM by embedding domain knowledge throughout the AI-driven MPM, from input data to model design and model output. This newly proposed approach provides strong geological and conceptual leads that guide the entire AI-driven MPM model training process, thereby improving model interpretability and performance. Overall, the development of XAI models for MPM is capable of embedding prior and expert knowledge throughout the modeling process, presenting a valuable and promising area for future research designed to improve MPM.

关键词：

Breaking the linear correlations for enhanced electrochemical nitrogen reduction by carbon-encapsulated mixed-valence Fe_(7)(PO_(4))_(6)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第8期31卷 182-187,I0006页

作者： Lehui Ma fanfan xu Linlin Zhang Zhongfen Nie Kai Xia Mingxia Guo Mingzhu Li Xin Ding College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071ShandongChina

Electrochemical nitrogen reduction(NRR)is deemed as a consummate answer for the traditional Haber–Bosch technology.Breaking the linear correlations between adsorption and transition-state energies of intermediates is vital to improve the kinetics of ammonia synthesis and obtain a less energy-intensive process.Herein,carbon-encapsulated mixed-valence Fe_(7)(PO_(4))_(6) was prepared and applied as an electrocatalyst for high-efficiency NRR.A dramatic faradaic efficiency(FE)of 36.93%and an NH_(3) production rate of 13.1μg h^(-1) mg_(cat)^(-1) were obtained at-0.3 V versus RHE,superior to nearly all Fe-based catalysts.Experiments and DFT calculations revealed that the superior performance was ascribed to the synergistic effect of mixed-valence iron pair,which braked the linear correlations to improve the kinetics of ammonia from collaborative hydrogenation and*NH_(3) separation.This work proves the feasibility of mixedvalence catalysts for nitrogen reduction and thus opening a new avenue towards artificial nitrogenfixation catalysts.

关键词： N2 reduction reaction(NRR) Mixed-valence Linear correlations Nitrogen fixation N_(2)activation

A layered multifunctional framework based on polyacrylonitrile and MOF derivatives for stable lithium metal anode

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第6期93卷 282-288,I0007页

作者： fanfan Liu Peng Zuo Jing Li Pengcheng Shi Yu Shao Linwei Chen Yihong Tan Tao Ma Engineering Research Center of High-frequency Soft Magnetic Materials and Ceramic Powder Materials of Anhui Province School of Chemistry and Material EngineeringChaohu UniversityHefei 238024AnhuiChina Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Pharmacy Anhui University of Chinese MedicineHefei 230012AnhuiChina School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006GuangdongChina Jiujiang DeFu Technology Co. Ltd.Jiujiang 332000JiangxiChina

Composite Li metal anodes based on three-dimensional(3D) porous frameworks have been considered as an effective material for achieving stable Li metal batteries with high energy density.However,uneven Li deposition behavior still occurs at the top of 3D frameworks owing to the local accumulation of Li ions.To promote uniform Li deposition without top dendrite growth,herein,a layered multifunctional framework based on oxidation-treated polyacrylonitrile(OPAN) and metal-organic framework(MOF) derivatives was proposed for rationally regulating the distribution of Li ions flux,nucleation sites,and electrical conductivity.Profiting from these merits,the OPAN/carbon nano fiber-MOF(CMOF) composite framework demonstrated a reversible Li plating/stripping behavior for 500 cycles with a stable Coulombic efficiency of around 99.0% at the current density of 2 mA/cm~2.Besides,such a Li composite anode exhibited a superior cycle lifespan of over 1300 h under a low polarized voltage of 18 mV in symmetrical cells.When the Li composite anode was paired with LiFePO_(4)(LFP) cathode,the obtained full cell exhibited a stable cycling over 500 cycles.Moreover,the COMSOL Multiphysics simulation was conducted to reveal the effects on homogeneous Li ions distribution derived from the above-mentioned OPAN/CMOF framework and electrical insulation/conduction design.These electrochemical and simulated results shed light on the difficulties of designing stable and safe Li metal anode via optimizing the 3D frameworks.

关键词： Lithium metal anode Layered multifunctional framework Ions flux redistribution Electrical insulation/conduction structure Uniform Li deposition

Synthesis and photoluminescent properties of Sm^(3+)-activated La_(3)Si_(6)N_(11)as an orange-red emitting phosphor

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2021年第2期39卷 140-145页

作者： Lili Liu Junfei Zhang fanfan xu Fu Du Fengli Yang Jiaqing Peng Xinyu Ye Faculty of Materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou 341000China Key Laboratory of Rare Earth Luminescence Materials and Devices of Jiangxi Province Ganzhou 341000China National Engineering Research Center for Ionic Rare Earth.Ganzhou 341000 China

A series of Sm^(3+)-doped La_(3)Si_(6)N_(11)phosphor materials we re synthesized by a high temperature solid-state reaction method.The crystal structure,micro structure,photoluminescence properties,decay curves as well as thermal quenching properties of the as-prepared phosphors were investigated systematically.The excitation spectra contain a wide asymmetric band below 350 nm originating from the host absorption,several sharp excitation peaks in the range of 300-550 nm corresponding to f-f transition of Sm^(3+).Under the excitation of 369 and 414 nm light,the phosphors exhibit strong narrow-band orangered emission peaked at 605 nm.The average decay time of La_(2.99)Si_(6)N_(11):0.01 Sm^(3+)sample is fitted to be0.38 ms and the CIE coordinates were calculated to be(0.6105,0.3833).For water resistance,La_(3)Si_(6)N_(11):Sm^(3+)is better than K_(2)SiF_(6):Mn^(4+)phosphor.After soaking in deionized water for 300 min,the La_(3)Si_(6)N_(11):Sm^(3+)sample retains approximately 80%of its initial relative emission intensity.When the temperature rises to 423 K(150℃),the emission intensity of La_(2.99)Si_(6)N_(11):0.01 Sm^(3+)sample remains 85%in co mparison to that of room tempe rature.The activation energy was calculated to be 0.63253 eV,which is higher than those of Sm^(3+)-activated oxide phosphors,indicating that the phosphor has relatively good thermal stability.

关键词： La_(3)Si_(6)N_(11) Red phosphor Sm^(3+)-activated Rare earths

紫草素调节Nrf2/HO-1信号通路对实验性大鼠肉芽肿性小叶性乳腺炎的治疗作用研究

在线全文

学校读者我要写书评

暂无评论

中国临床解剖学杂志 2024年第1期42卷 26-32页

作者：李凡凡徐阳王晓旭天津中医药大学第一附属医院(国家中医针灸临床医学研究中心)乳腺外科天津300193 天津中医药大学第一附属医院(国家中医针灸临床医学研究中心)疮疡血管外科天津300193

目的探究紫草素(Shikonin,SHI)通过调节核因子-红细胞2型相关因子2/血红素加氧酶(Nrf2/HO-1)信号通路对肉芽肿性小叶性乳腺炎模型大鼠的影响及作用机制。方法建立肉芽肿性小叶性乳腺炎(GLM)大鼠模型,将大鼠分为对照组(Control组)、模型... 详细信息

目的探究紫草素(Shikonin,SHI)通过调节核因子-红细胞2型相关因子2/血红素加氧酶(Nrf2/HO-1)信号通路对肉芽肿性小叶性乳腺炎模型大鼠的影响及作用机制。方法建立肉芽肿性小叶性乳腺炎(GLM)大鼠模型,将大鼠分为对照组(Control组)、模型组(GLM组)、紫草素低剂量组(SHI-L组,17.5 mg·kg^(-1)·d^(-1)SHI)、紫草素中剂量组(SHI-M组,35 mg·kg^(-1)·d^(-1)SHI)、紫草素高剂量组(SHI-H组,70mg·kg^(-1)·d^(-1)SHI)和紫草素高剂量+Nrf2抑制剂ML385组(SHI-H+ML385组,70 mg·kg^(-1)·d^(-1)SHI+14 mg·kg^(-1)·d^(-1)ML385)。HE染色观察乳腺组织病理变化情况;ELISA检测乳腺组织中IL-1β、TNF-α、IL-8、T-AOC、SOD、GSH、MPO、NAGase和ROS水平;免疫荧光检测NLRP3表达;Western blotting检测Nrf2和HO-1蛋白表达。结果与Control组相比,GLM组大鼠乳腺小叶完全被破坏、大片结节样慢性肉芽肿炎性病灶生成,乳腺小叶组织边界不清,腺叶内出现空泡,伴有大量淋巴细胞及中性粒细胞浸润;IL-8、IL-1β、TNF-α、ROS、MPO和NAGase水平、NLRP3阳性表达率显著增加(P<0.05),T-AOC、SOD和GSH水平、Nrf2和HO-1蛋白表达显著降低(P<0.05)。与GLM组相比,SHI-L组、SHI-M组和SHI-H组乳腺组织病变逐渐减轻;IL-8、IL-1β、TNF-α、ROS、MPO和NAGase水平、NLRP3阳性表达率依次降低(P<0.05),T-AOC、SOD和GSH水平、Nrf2和HO-1蛋白表达依次升高(P<0.05)。与SHI-H组相比,SHI-H+ML385组乳腺组织病变加重;IL-8、IL-1β、TNF-α、ROS、MPO和NAGase水平、NLRP3阳性表达率显著增加(P<0.05),T-AOC、SOD和GSH水平、Nrf2和HO-1蛋白表达显著降低(P<0.05)。结论紫草素发挥抗炎抗氧化作用改善大鼠肉芽肿性小叶性乳腺炎,其机制可能与激活Nrf2信号通路,上调HO-1表达有关。

关键词：紫草素核因子-红细胞2型相关因子2/血红素加氧酶信号通路肉芽肿性小叶性乳腺炎

图像跨尺度特征融合与数据增强的公交客流检测模型

在线全文

学校读者我要写书评

暂无评论

武汉大学学报（信息科学版） 2024年第5期49卷 700-708页

作者：黄丽龚志鹏刘凡凡程起敏中南民族大学电子信息工程学院湖北武汉430074 华中科技大学电子信息与通信学院湖北武汉430074

针对目前公交客流目标检测中由于前后排乘客图像尺寸差距大、遮挡严重而难以检测的问题,提出一种改进的目标检测模型YOLOv5s_P。该模型基于YOLOv5基本架构,针对乘客图像尺寸差距大的问题,使用重复加权双向特征金字塔网络结构替换YOLOv5... 详细信息

针对目前公交客流目标检测中由于前后排乘客图像尺寸差距大、遮挡严重而难以检测的问题,提出一种改进的目标检测模型YOLOv5s_P。该模型基于YOLOv5基本架构,针对乘客图像尺寸差距大的问题,使用重复加权双向特征金字塔网络结构替换YOLOv5中的路径聚合网络结构,引入权重机制双向跨尺度融合不同特征,增强提取复杂目标特征的能力;同时针对遮挡问题,结合Mixup数据增强方法,扩充遮挡和重叠图像的训练样本,提高模型泛化能力,减少客流图像残缺导致的漏检。为了验证YOLOv5s_P模型性能,将其应用于实际公交场景,并与Faster R-CNN、SSD300、RetinaNet、YOLOv5s 4种模型进行对比测试。实验结果表明,YOLOv5s_P模型在不影响检测速度的情况下,平均精度均值达到96.9%,平均漏检率较YOLOv5s模型降低了3.43%,提高了公交客流的检测精度。

关键词：深度学习 YOLOv5s_P 公交客流目标检测特征融合数据增强

数智时代的信息分析方法：数据驱动、知识驱动及融合驱动

在线全文

学校读者我要写书评

暂无评论

中国图书馆学报 2024年第1期50卷 29-44页

作者：卢小宾霍帆帆王壮霍朝光中国人民大学信息资源管理学院中国人民大学智能信息分析研究中心北京语言大学新闻传播学院

数智时代，面对大数据、大知识所带来的挑战，如何创新发展信息分析方法，关乎新时代信息分析工作的开展，关乎数据资源的开发利用。本文在梳理现有信息分析方法的基础上，提出数据驱动、知识驱动，以及数据与知识融合驱动的三种数智型... 详细信息

数智时代，面对大数据、大知识所带来的挑战，如何创新发展信息分析方法，关乎新时代信息分析工作的开展，关乎数据资源的开发利用。本文在梳理现有信息分析方法的基础上，提出数据驱动、知识驱动，以及数据与知识融合驱动的三种数智型方法思路。首先，提出基于文本、网络、音频、图像等的数据驱动以及与之相应的文本挖掘、图挖掘、音频挖掘、图像挖掘等信息分析模式；其次，提出基于专家知识库、通用知识库、领域知识图谱、通用知识图谱等的知识驱动信息分析模式；最后，提出基于特征、模型、决策三种层面的数据与知识融合驱动的信息分析模式。通过以上三种方法，构建能够系统融合大数据、大知识的信息分析方法，实现数智融合型信息分析，促进图书情报学科方法论发展，赋能国家决策和社会治理。图3。表1。参考文献59。

关键词：信息分析数智时代数据驱动知识驱动融合驱动