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木材红外干燥机理的实验研究

天津大学学报 1988年第1期 62-68页

作者：褚治德刘嘉智许铁栓韩斌赵剑天津大学热物理工程系

通过对木板多点温度、湿度及干燥速率等参数的测量,得到了干球温度、木板温度及干燥速率的变化规律。据此,推导了适合于全干燥过程的干燥速率的公式,并对木材干燥影响极大的升温速率问题也做了分析。

关键词：红外线干燥干燥率传热传质学

Regulating local coordination environment of Mg-Co single atom catalyst for improved direct methanol fuel cell cathode

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Journal of Magnesium and Alloys 2023年第6期11卷 1959-1969页

作者： Kaiwen Wang hanjun Zou jiazhi Meng Chaogang Ban Xue Liu Jiangping Ma Cong Wang Liyong Gan Xiaodong han Xiaoyuan Zhou College of Physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing 401331China Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100024China Institute of Emerging Energy Storage Materials and Equipment Chongqing 401135China Analytical and Testing Center Chongqing UniversityChongqing 401331China

Fuel cells operated with a reformate fuel such as methanol are promising power systems for portable electronic devices due to their high safety,high energy density and low pollutant ***,several critical issues including methanol crossover effect,CO-tolerance electrode and efficient oxygen reduction electrocatalyst with low or non-platinum usage have to be addressed before the direct methanol fuel cells(DMFCs)become commercially available for industrial ***,we report a highly active and selective Mg-Co dualsite oxygen reduction reaction(ORR)single atom catalyst(SAC)with porous N-doped carbon as the *** catalyst exhibits a commercial Pt/C-comparable half-wave potential of 0.806 V(versus the reversible hydrogen electrode)in acid media with good ***,practical DMFCs test achieves a peak power density of over 200 m W cm^(-2)that far exceeds that of commercial Pt/C counterpart(82 m W cm^(-2)).Particularly,the Mg-Co DMFC system runs over 10 h with negligible current loss under 10 M concentration methanol work *** results and theoretical calculations reveal that the N atom coordinated by Mg and Co atom exhibits an unconventional d-band-ditto localized p-band and can promote the dissociation of the key intermediate*OOH into*O and*OH,which accounts for the near unity selective 4e-ORR reaction pathway and enhanced ORR *** contrast,the N atom in SAC–Co remains inert in the absorption and desorption of*OOH and**** local coordination environment regulation strategy around active sites may promote rational design of high-performance and durable fuel cell cathode electrocatalysts.

关键词： Single atom catalyst Mg−N−Co DMFC Cathode

Isotype Heterojunction‑Boosted CO_(2) Photoreduction to CO

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Nano-Micro Letters 2022年第5期14卷 34-46页

作者： Chaogang Ban Youyu Duan Yang Wang Jiangping Ma Kaiwen Wang jiazhi Meng Xue Liu Cong Wang Xiaodong han Guozhong Cao Liyong Gan Xiaoyuan Zhou College of Physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing 401331People’s Republic of China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 401331People’s Republic of China Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100024People’s Republic of China Analytical and Testing Center Chongqing UniversityChongqing 401331People’s Republic of China Department of Materials Science and Engineering University of WashingtonSeattleWA 98195USA

Photocatalytic conversion of CO_(2) to high-value products plays a crucial role in the global pursuit of carbon–neutral *** photocatalysts,such as the isotype heterojunctions,offer an ideal paradigm to navigate the photocatalytic CO_(2) reduction reaction(CRR).Herein,we elucidate the behaviors of isotype heterojunctions toward photocatalytic CRR over a representative photocatalyst,g-C_(3)N_(4).Impressively,the isotype heterojunctions possess a significantly higher efficiency for the spatial separation and transfer of photogenerated carriers than the single *** with the intrinsically outstanding stability,the isotype heterojunctions exhibit an exceptional and stable activity toward the CO_(2) photoreduction to *** importantly,by combining quantitative in situ technique with the first-principles modeling,we elucidate that the enhanced photoinduced charge dynamics promotes the production of key intermediates and thus the whole reaction kinetics.

关键词： Isotype heterojunction g-C_(3)N_(4) CO_(2)photoreduction Charge dynamics Reaction mechanism

Bismuth clusters pinned on TiO_(2) porous nanowires boosting charge transfer for CO_(2) photoreduction to CH_(4)

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Nano Research 2024年第3期17卷 1190-1198页

作者： jiazhi Meng Kaiwen Wang Yang Wang Jiangping Ma Chaogang Ban Yajie Feng Bin Zhang Kai Zhou Liyong Gan Guang han Danmei Yu Xiaoyuan Zhou College of Physics and Institute of Advanced Interdisciplinary Studies Chongqing UniversityChongqing 401331China School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 401331China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Beijing Key Lab of Microstructure and Properties of Advanced Materials Beijing University of TechnologyBeijing 100124China Analytical and Testing Center Chongqing UniversityChongqing 401331China

Artificial photosynthesis in carbon dioxide(CO_(2))conversion into value-added chemicals attracts considerable attention but suffers from the low activity induced by sluggish separation of photogenerated carriers and the kinetic bottleneck-induced unsatisfied ***,we prepare a new-style Bi/TiO_(2) catalyst formed by pinning bismuth clusters on TiO_(2) nanowires through being confined by pores,which exhibits high activity and selectivity towards photocatalytic production of CH_(4) from CO_(2).Boosted charge transfer from TiO_(2) through Bi to the reactants is revealed via in situ X-ray photon spectroscopy and time-resolved photoluminescence(PL).Further,in situ Fourier transform infrared results confirm that Bi/TiO_(2) not only overcomes the multi-electron kinetics challenge of CO_(2) to CH_(4) via boosting charge transfer,but also facilitates proton production and transfer as well as the intermediates*CHO and*CH_(3)O generation,ultimately achieving the tandem catalysis towards *** calculation also underlies that the more favorable reaction step from*CO to*CHO on Bi/TiO_(2) results in CH_(4) production with higher *** work brings new insights into rational design of photocatalysts with high performance and the formation mechanism of CO_(2) to CH_(4) for solar energy storage in future.

关键词： carbon dioxide(CO_(2))photoreduction charge transfer tandem catalysis methanation

Syntheses and characterization of anti-thrombotic and anti-oxidative Gastrodin-modified polyurethane for vascular tissue engineering

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Bioactive Materials 2021年第2期6卷 404-419页

作者： Meng Zheng jiazhi Guo Qing Li Jian Yang Yi han Hongcai Yang Mali Yu Lianmei Zhong Di Lu Limei Li Lin Sun Yunnan Key Laboratory of Stem Cell and Regenerative Medicine Science and Technology Achievement Incubation CenterKunming Medical UniversityKunming650500China Department of Biomedical Engineering Materials Research InstituteThe Huck Institutes of the Life SciencesThe Pennsylvania State UniversityUniversity ParkPA16802USA Department of Neurology The First Affiliated HospitalKunming Medical UniversityKunming650500China Department of Cardiology The Second Affiliated HospitalKunming Medical UniversityKunming650032China

Vascular grafts must avoid negative inflammatory responses and thrombogenesis to prohibit fibrotic deposition immediately upon implantation and promote the regeneration of small diameter blood vessels(hane(PU)elastomers incorporating anti-coagulative and anti-inflammatory Gastrodin were *** films had inter-connected pores with porosities equal to or greater than 86%and pore sizes ranging from 250 to 400μ*** of Gastrodin into PU films resulted in desirable mechanical properties,hydrophilicity,swelling ratios and degradation rates without *** released Gastrodin maintained bioactivity over 21 days as assessed by its anti-oxidative *** Gastrodin/PU had better anti-coagulation response(less observable BSA,fibrinogen and platelet adhesion/activation and suppressed clotting in whole blood).Red blood cell compatibility,measured by hemolysis,was greatly improved with 2Gastrodin/PU compared to other Gastrodin/PU ***,Gastrodin/PU upregulated anti-oxidant factors Nrf2 and HO-1 expression in H2O2 treated HUVECs,correlated with decreasing pro-inflammatory cytokines TNF-αand IL-1β in RAW 264.7 *** implantation in a subcutaneous pocket,PU was encapsulated by an obvious fibrous capsule,concurrent with a large amount of inflammatory cell infiltration,while Gastrodin/PU induced a thinner fibrous capsule,especially 2Gastrodin/***,enhanced adhesion and proliferation of HUVECs seeded onto films in vitro demonstrated that 2Gastrodin/PU could help cell recruitment,as evidenced by rapid host cell infiltration and substantial blood vessel formation in *** results indicate that 2Gastrodin/PU has the potential to facilitate blood vessel regeneration,thus providing new insight into the development of clinically effective vascular grafts.

关键词： Gastrodin Polyurethane Anti-coagulation Anti-inflammation Angiogenesis

Supported Cu/Ni Bimetallic Cluster Electrocatalysts Boost CO_(2) Reduction

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Precision Chemistry 2024年第3期2卷 96-102页

作者： Depeng Wang jiazhi Wang Zhi Wang Ning Zhang Jianrong Zeng Haixia Zhong Xinbo Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China

Supported metal clusters with the integrated advantages of single-atom catalysts and conventional nanoparticles held great promise in the electrocatalytic carbon dioxide reduction(ECO_(2)R)operated at low overpotential and high current ***,its precise synthesis and the understanding of synergisti-cally catalytic effects remain ***,we report a facile method to synthesize the bimetallic Cu and Ni clusters anchored on porous carbon(Cu/Ni-NC)and achieve an enhanced ECO_(2)*** aberration-corrected high-angle annular dark-field scanning transmission electron microscopy and synchrotron X-ray absorption spectroscopy were employed to verify the metal dispersion and the coordination of Cu/Ni clusters on *** a result of this route,the target Cu/Ni-NC exhibits excellent electrocatalytic performance including a stable 30 h electrolysis at 200 mA cm^(-2) with carbon monoxide Faradaic efficiency of∼95.1%using a membrane electrode assembly electrolysis *** with the in situ analysis of the surface-enhanced Fourier transform infrared spectroelectrochemistry,we propose that the synergistic effects between Ni and Cu can effectively promote the H_(2)O dissociation,thereby accelerate the hydrogenation of CO_(2)to*COOH and the overall reaction process.

关键词： electrocatalytic CO_(2)reduction bimetallic cluster synergistic catalysis membrane electrode assembly electrolysis cell in situ surface-enhanced infrared absorption spectroscopy

信托业发展与经济增长——基于我国省际面板数据的实证分析

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财经理论与实践 2021年第4期42卷 48-57页

作者：陈涵谢家智西南大学经济管理学院重庆400700 重庆财经职业学院博士后科研工作站重庆402160

基于金融发展理论分析信托业发展的经济效应传导机制,在数据可收集的前提下,采用2004-2018年我国各省市信托公司的面板数据,运用静态面板数据模型和动态面板数据的系统GMM估计方法对信托业发展和经济增长的关系进行实证分析,结果显著证... 详细信息

基于金融发展理论分析信托业发展的经济效应传导机制,在数据可收集的前提下,采用2004-2018年我国各省市信托公司的面板数据,运用静态面板数据模型和动态面板数据的系统GMM估计方法对信托业发展和经济增长的关系进行实证分析,结果显著证明了信托业发展能促进经济增长,反映信托业发展的重要指标——新增集合信托规模、数量以及实收信托规模的增加能显著提高人均GDP增长率和GDP增长率。因此需大力发展我国信托业,回归“受人之托,代人理财”的信托本源,提高信托业发展质量,推动经济增长。

关键词：信托业发展经济增长面板数据 GMM

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钼尾矿粉对砂浆强度和微结构影响的试验研究

中南大学学报(自然科学版) 2024年第11期55卷 4236页

作者：韩志园杨鹰孟维琦范佳志马昆林中南大学土木工程学院湖南长沙410075 伊春鹿鸣矿业有限公司黑龙江伊春153000

以钼尾矿粉(molybdenum tailings powder,MTs)作为掺合料,采用标养和蒸养2种养护制度,制备砂浆和净浆,研究MTs掺量和养护方式对砂浆力学强度的影响,并通过压汞(MIP)、热重(TG)和扫描电镜(SEM)等方法探讨不同养护条件下MTs对净浆孔结构... 详细信息

以钼尾矿粉(molybdenum tailings powder,MTs)作为掺合料,采用标养和蒸养2种养护制度,制备砂浆和净浆,研究MTs掺量和养护方式对砂浆力学强度的影响,并通过压汞(MIP)、热重(TG)和扫描电镜(SEM)等方法探讨不同养护条件下MTs对净浆孔结构、微观形貌特征以及水化产物种类和含量的影响。研究结果表明:随龄期增长,标养和蒸养砂浆的抗折和抗压强度均逐渐增大,但蒸养组砂浆的早期强度均比对应标养组的高。当MTs掺量不超过15%时,蒸养MTs砂浆1 d的强度不低于相应标养净浆28 d强度的70%,且标养和蒸养MTs砂浆28 d强度均不低于相应纯水泥浆体强度的90%。在标养和蒸养条件下,在净浆中掺入适量MTs后,均显著降低了有害孔的比例,增加了少害孔的比例,优化了浆体的孔结构。与基准组相比,尤其当MTs掺量为15%(质量分数)时,在蒸养条件下,净浆中孔径为[20,50)nm的少害孔增加了64.7%,孔径为200 nm以上的多害孔降低了26.7%,最可几孔径减小了11.6%。掺入MTs后,没有新的水化产物种类生成,且由于MTs的火山灰效应,促进了浆体中水泥的二次水化反应,生成了更多水化产物填充孔隙,从而使浆体微结构变得致密。掺入适量的MTs后,砂浆的力学强度并未显著降低,生成的水化产物减小了水泥基材料的孔径,增加了密实性。采用MTs作为掺合料制备低碳型水泥基材料,可以减少水泥基材料中的水泥用量,降低建筑行业的碳排放,便于钼尾矿在水泥基材料中的推广应用,实现了钼尾矿的资源化利用。

关键词：钼尾矿粉养护方式水泥基材料力学性能微结构

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超高速光互连系统级封装技术前沿研究

微电子学 2020年第6期50卷 885-889页

作者：谢家志毛海燕赖凡杨晗中国电子科技集团公司第二十四研究所重庆400060 中国电子科技集团公司第二十六研究所重庆400060

光互连系统级封装技术是用光互连在封装尺度上代替铜互连,以突破目前芯片间通信低速度瓶颈。超高速光互连系统级封装的目标是开发出可集成光子收发器,并嵌入到现代尖端的系统级封装中(SiP)中,以提高并行计算系统的数据传输效率或速度。... 详细信息

光互连系统级封装技术是用光互连在封装尺度上代替铜互连,以突破目前芯片间通信低速度瓶颈。超高速光互连系统级封装的目标是开发出可集成光子收发器,并嵌入到现代尖端的系统级封装中(SiP)中,以提高并行计算系统的数据传输效率或速度。文章介绍了超高速光互连系统级封装关键技术及前沿研究情况,通过分析IMEC、Intel、BAE系统公司等研究机构的开发现状和技术发展路线,论述了光互连SiP关键技术的发展趋势。

关键词：光互连硅光子 InP 光学I/O 系统级封装