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Nanostructured MXene-based materials for boosting hydrogen sorption properties of Mg/MgH_(2)

Materials Reports(Energy) 2024年第1期4卷 58-68页

作者： Yingyan Zhao bolun wang Li Ren Yinghui Li Xi Lin Qiuyu Zhang Zhigang Hu Jianxin Zou National Engineering Research Center of Light Alloys Net Forming&State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai200240PR China Shanghai Engineering Research Center of Mg Materials and Applications&School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai200240PR China Shanghai Key Laboratory of Hydrogen Science&Center of Hydrogen Science Shanghai Jiao Tong UniversityShanghai200240PR China

Hydrogen holds the advantages of high energy density,great natural abundance and zero emission,making it suitable for large scale and long term energy storage,while its safe and efficient storage is still *** various solid state hydrogen storage materials,MgH_(2) is promising for industrial applications due to its high gravimetric and volumetric hydrogen densities and the abundance of Mg on ***,the practical application of MgH_(2) has been limited by its stable thermodynamics and slow hydrogen desorption *** is considered as a promising approach for improving the hydrogen storage performance of MgH_(2) and bringing it closer to the requirements of commercial *** is worth mentioning that the recently emerging two-dimensional material,MXene,has showcased exceptional catalytic abilities in modifying the hydrogen storage properties of MgH_(2).Besides,MXene possesses a high surface area,excellent chemical/physical stability,and negatively charged terminating groups,making it an ideal support for the"nanoconfinement"of MgH_(2) or highly active ***,we endeavor to provide a comprehensive overview of recent investigations on MXene-based catalysts and MXene supports for improving the hydrogen sorption properties of Mg/MgH_(2).The mechanisms of hydrogen sorption involved in Mg-MXene based composites are highlighted with special emphases on thermodynamics,kinetics,and catalytic *** aim of this work is to provide a comprehensive and objective review of researches on the development of high-performance catalysts/supports to improve hydrogen storage performances of Mg/MgH_(2) and to identify the opportunities and challenges for future applications.

关键词： Magnesium-based hydride MXene Catalytic modification Nano-confinement Hydrogen storage performance

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一种融合运动预测的三维点云目标跟踪算法

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信号处理 2024年第3期40卷 516-523页

作者：张远刘昭娣杨大林王伯伦王彦平北方工业大学信息学院人工智能系北京100144

随着人工智能技术的发展以及对目标跟踪理论的研究深入,目标跟踪技术在实际生活中得到了广泛的应用,对于许多视觉应用,目标跟踪更是一项必不可少的技术。目前,针对二维图像的目标跟踪研究已取得了丰硕的成果,但基于三维点云的目标跟踪... 详细信息

随着人工智能技术的发展以及对目标跟踪理论的研究深入,目标跟踪技术在实际生活中得到了广泛的应用,对于许多视觉应用,目标跟踪更是一项必不可少的技术。目前,针对二维图像的目标跟踪研究已取得了丰硕的成果,但基于三维点云的目标跟踪技术还处于研究发展阶段。近年来,由于激光雷达的广泛应用以及深度学习技术在三维点云领域的研究,基于激光雷达点云的目标跟踪技术也取得了一些进展。现有的基于激光雷达点云目标的跟踪算法主要分为两大类:传统滤波算法和深度学习算法。虽然基于传统滤波的点云目标跟踪算法可以达到更好的效果,但是很难给这类算法赋予最优的参数,并且这类算法在一些剧烈变化的场景中很容易失效。而基于深度学习的激光雷达点云目标跟踪算法大多是“检测-跟踪”的架构,这种架构最大的问题是后端跟踪任务严重依赖于前端检测结果,当前端检测器失效时,后端跟踪模块就无法进行跟踪,这会造成大量的目标丢失问题。针对以上问题,本文使用了一种以运动预测为中心的深度学习架构。该架构将检测和运动预测相结合,主要分为两个阶段:第一阶段通过点云特征提取对目标进行检测,将目标从点云中分割出来,并将目标定位到连续帧中;第二阶段通过运动预测更新分支对目标框进行优化,以得到更准确的目标位置。实验结果表明,该方法有效,且跟传统滤波方法相比,能更好的应对一些剧烈变化的场景;跟深度学习方法中的“检测-跟踪”架构相比,减少了目标丢失的情况。针对激光雷达点云目标跟踪,能得到更精确的跟踪结果。

关键词：激光雷达点云目标跟踪深度学习运动预测

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Determination of the acidic properties of carboxylated carbocatalysts in an acid-catalyzed ring-opening reaction using kinetic profiling

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Nano Research 2017年第9期10卷 2954-2965页

作者： bolun wang Guodong Wen Dangsheng SU Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China Department of Inorganic Chemistry Fritz Haber Institute of the Max Planck Society Berlin 14195 Germany

The acid-catalyzed ring-opening reaction of styrene oxide was used as a probe reaction for evaluating the acidic properties of carboxylated carbocatalysts. Significant discrepancies in the initial reaction rates were normalized using the total number of carboxyl groups, and demonstrated that the average catalytic activities of the carboxyl moieties on the carbocatalysts differed. Comparisons between the apparent activation energy E a and the pre-exponential factor A, derived from Arrhenius analysis, demonstrated that A varied more significantly, and therefore had a more significant effect on the reaction rates than E a. The variation in the calculated pKa values of the carboxyl groups was attributed to the electronic effects of the nitro groups. This hypothesis was supported by the temperature programmed desorption profiles of nitrogen monoxide ions.

关键词： carboxylated carbocatalysts acidic properties ring-opening reaction Arrhenius analysis pKa values electronic effect

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聚碳酸酯挤压形变力学行为有限元模拟

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材料工程 2024年第3期52卷 90-99页

作者：王博伦王韬霍钟祺孙琦伟李茂源张云陈宇宏颜悦中国航发北京航空材料研究院北京100095 北京市先进运载系统结构透明件工程技术研究中心北京100095 华中科技大学材料成形与模具技术国家重点实验室武汉430074

采用有限元方法研究了聚碳酸酯在中应变率下挤压形变的力学行为。基于DSGZ本构模型,开展聚碳酸酯圆柱单轴压缩形变有限元模拟,对比模拟与实验结果,计算模型预测准确度,分析材料压缩形变后的多物理场分布,验证模型对压缩力学响应预测的... 详细信息

采用有限元方法研究了聚碳酸酯在中应变率下挤压形变的力学行为。基于DSGZ本构模型,开展聚碳酸酯圆柱单轴压缩形变有限元模拟,对比模拟与实验结果,计算模型预测准确度,分析材料压缩形变后的多物理场分布,验证模型对压缩力学响应预测的有效性。模拟聚碳酸酯平板在侧向受限挤压模式下的固态形变,获得了制件的力学演变规律。结果显示,单轴压缩模拟与实验应力-应变曲线吻合度高,DSGZ模型可较为准确地预测压缩弹-塑性形变过程中的应力-应变关系。在圆柱单轴压缩形变与平板挤压形变模拟中,材料整体变形均匀,应力响应温度变化比响应应变率变化更敏感。模拟结果有效地反映了聚碳酸酯挤压形变力学特性,可成为聚碳酸酯挤压形变工程实现的重要依据,为材料强化及其在飞机座舱透明件中的应用提供有力支持。

关键词：聚碳酸酯挤压形变本构模型有限元

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Photoluminescent chiral carbon dots derived from glutamine

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Chinese Chemical Letters 2021年第12期32卷 3916-3920页

作者： Wenyan Ma bolun wang Yonggang Yang Jiyang Li State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Department of Polymer Science and Engineering College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

The integration of luminescence and chirality in carbon dots(CDs) encourages candidates to explore novel functions and applications of CDs, however, the preparation of chiral CDs is very limited. Herein, we report a hydrothermal method to fabricate chiral CDs by utilizing amino acid enantiomers as the precursors. LGln-CDs or DGln-CDs with uniform size of 3–4 nm show excitation-dependent blue fluorescence in solutions. Circular dichroism measurement confirms the opposite optical rotation of chiral CDs in the region from 200 nm to 300 nm, and the signals can be regulated by concentrations of CDs solution. Timedependent density functional calculation reveals that polypeptides may exist on the surface of CDs due to the polycondensation of L/DGln at high temperature, and the optical activity of CDs originates from the stacking of neighboring carbonyl groups. The facile synthetic methodology proposed will provide potential opportunities for the preparation and application of chiral and chiroptical CDs-based materials.

关键词： Chirality Carbon dots Photoluminescence Circular dichroism Sensors

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Carbon Dots Derived from Coffee Residue for Sensitive and Selective Detection of Picric Acid and Iron(III)Ions

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Chemical Research in Chinese Universities 2021年第3期37卷 623-628页

作者： ZONG Siyu wang bolun MA Wenyan YAN Yan LI Jiyang University Changchun130012P.R.China

A facile method was developed to prepare carbon dots(CDs)by pyrolysis and etching of coffee *** as-prepared CDs show uniform spherical nanoparticles with an average size of 2.3 nm and exhibit excitation-dependent fluorescence ***,CDs also exhibit strong fluorescence quenching to nitro compounds and metal ions in both water and ethanol solutions,which could act as a platform for dual detection of PA(picric acid)and Fe^(3+)ions with low detection limits of 0.26 and 0.83µmol/L,*** work provides a novel method for preparation of environmental-friendly fluorescent CDs and shows their potential applications in photoluminescence sensors.

关键词： Carbon dot Coffee residue Luminescence Detection

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Calcination-controlled fabrication of carbon dots@zeolite composites with multicolor fluorescence and phosphorescence

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Nano Research 2022年第10期15卷 9454-9460页

作者： Siyu Zong bolun wang Xin Yin Wenyan Ma Jiani Zhang Jiyang Li State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China

In light of the exceptional optical qualities,luminous carbon dots(CDs),particularly those with room-temperature phosphorescence(RTP),have a wide range of applications in a variety of ***,modulating afterglow emissions practically and efficiently remains a serious ***,a feasible strategy of calcination combined with in-situ synthesis is proposed to fabricate CDs-based composites with multicolor fluorescence(FL)and *** pre-selection of small pore RHO zeolite as a matrix,CDs have been successfully embedded due to strong guest–host interaction achieved by insitu hydrothermal *** the unique pore architecture and excellent stability of the zeolite matrix,the surface oxidation degree and the carbon core size of confined CDs are engineered by temperature-controlled *** resulting composites exhibit tunable FL(from 416 to 566 nm)and RTP(from 440 to 585 nm)in solid and aqueous solution,in which rarely occurring deep blue RTP is observed with a lifetime as long as 573 ***,the universality of such a calcination-modulated luminescent method has been proved by the AFI zeolite *** study offers up a new way to regulate the luminescence of CDs facilitated by matrix,which considerably promotes the potential applications of CDs-based composites in the future.

关键词： carbon dots zeolite tunable phosphorescence calcination modulation host-guest

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不同碳源对***产维生素B_(12)发酵代谢动力学分析

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华东理工大学学报（自然科学版） 2024年第1期50卷 80-87页

作者：陈欣怡栗波赵杜娟汪博伦郭华楠付丽刘爱军杨辉王泽建广西大学生命科学与技术学院南宁530004 华东理工大学生物反应器工程国家重点实验室上海200237 浙江工业大学杭州310014 河北欣港药业有限公司石家庄051530

考察了Ensifer adhaerens(***)在不同碳源(麦芽糖、蔗糖、葡萄糖和果糖)条件下的生理代谢特性,并利用Logistic和Luedeking-Piret模型分析了黏着剑菌发酵过程生长动力学及产物合成动力学特性变化。结果表明,蔗糖能够显著促进***的生长和... 详细信息

考察了Ensifer adhaerens(***)在不同碳源(麦芽糖、蔗糖、葡萄糖和果糖)条件下的生理代谢特性,并利用Logistic和Luedeking-Piret模型分析了黏着剑菌发酵过程生长动力学及产物合成动力学特性变化。结果表明,蔗糖能够显著促进***的生长和合成代谢,补料批培养条件下发酵单位分别比葡萄糖、麦芽糖、果糖组高出53%、40%、103%;发酵代谢动力学分析表明,不同碳源条件下,***生产维生素B_(12)(VB_(12))呈现部分生长偶联型;蔗糖为最优碳源,最大比生长速率和最高发酵单位分别为0.054 h^(-1)和115 mg/L。***发酵过程中,蔗糖能够被逐渐分解为葡萄糖和果糖,维持合适的葡萄糖生成速率,用于提供足够的能量和前体用于菌体生长和VB_(12)合成,有效缓解了高质量浓度葡萄糖对菌体生长和产物合成的抑制。

关键词： E.adhaerens VB_(12) 碳源发酵代谢动力学

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The power of comments： fostering social interactions in microblog networks

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Frontiers of Computer Science 2016年第5期10卷 889-907页

作者： Tianyi wang Yang CHEN Yi wang bolun wang Gang wang Xing LI Haitao ZHENG Ben Y. ZHAO Department of Electronic Engineering Tsinghua University Beijing 100084 China Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China Department of Computer Science University of California Santa Barbara CA 93106-5110 USA School of Computer Science Fudan University Shanghai 201203 China Department of Mathematics Syracuse University Syracuse NY 13244-1150 USA

Today＇s ubiquitous online social networks serve multiple purposes, including social communication （Face- book, Renren）, and news dissemination （Twitter）. But how does a social network＇s design define its functionality？ An- swering this would need social network providers to take a proactive role in defining and guiding user behavior. In this paper, we first take a step to answer this question with a data-driven approach, through measurement and anal- ysis of the Sina Weibo microblogging service. Often com- pared to Twitter because of its format, Weibo is interesting for our analysis because it serves as a social communication tool and a platform for news dissemination, too. While similar to Twitter in functionality, Weibo provides a distinguishing feature, comments, allowing users to form threaded con- versations around a single tweet. Our study focuses on this feature, and how it contributes to interactions and improves social engagement. We use analysis of comment interactions to uncover their role in social interactivity, and use comment graphs to demonstrate the structure of Weibo users interac- tions. Finally, we present a case study that shows the impact of comments in malicious user detection, a key application on microblogging systems. That is, using properties of com- ments significantly improves the accuracy in both modeling and detection of malicious users.

关键词： microblogs comments social and interactiongraph user behavior

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Modulating hydrothermal condition to achieve carbon dots-zeolite composites with multicolor afterglow

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Nano Research 2023年第5期16卷 7761-7769页

作者： Jiali Wen Zhifeng Zeng bolun wang Junyu Hong Yingyuan Chen Jianyu Zhang Jiyang Li Jiuxing Jiang MOE Key Laboratory of Bioinorganic and Synthetic Chemistry School of ChemistrySun Yat-sen UniversityGuangzhou 510006China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionThe Hong Kong University of Science and TechnologyKowloonHong Kong 999077China Guangdong Provincial Key Laboratory of Optical Chemicals XinHuaYue GroupMaoming 525000China

Responsive luminescence materials with prolonged lifetime and multicolor emission have drawn great attention due to their attractive optical property and potential ***,two responsive carbon dots(CDs)based composites:CD_(1)@MCM-22P and CD_(2)@ZSM-12 were achieved by a one-step hydrothermal *** adjusting the hydrothermal condition,CD_(1)@MCM-22P owns temperature-dependent afterglow,while CD_(2)@ZSM-12 is equipped with excitation-dependent room-temperature *** photoluminescence mechanisms of CD1@MCM-22P and CD_(2)@ZSM-12 were investigated and proposed,and the composites were applied in multi-mode *** work provides an insight as well as a feasible method for the development of multi-emissive CDs@zeolite composite.

关键词： carbon dots zeolitic matrices responsive photoluminescence room-temperature phosphorescence thermally activated delayed fluorescence

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