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Thermoplastic elastomer enhanced interface adhesion and bending durability for flexible organic solar cells

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npj Flexible Electronics 2022年第1期6卷 548-557页

作者： Zihan Xu Yunfei Han Yuanyuan Bai Xingze Chen Jingbo Guo Lianping Zhang Chao Gong Qun Luo Ting Zhang chang-Qi ma School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefeiPR China Printable Electronics Research Center Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhouPR China i-Lab Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhouPR China

Stable interface adhesion and bending durability of flexible organic solar cells(FOSCs)is a basic requirement for its real application in wearable ***,the device performance always degraded during continuous ***,we revealed the weak interface adhesion force between MoO_(3) hole transporting layer(HTL)and the organic photoactive layer was the main reason of poor bending *** insertion of an interface bonding layer with a thermoplastic elastomer,polystyrene-blockpoly(ethylene-ran-butylene)-block-polystyrene(SEBS)effectively improved the interface adhesion force of MoO_(3) HTL and the active layer and decreased the modulus,which ensured higher than 90%of the initial efficiency remaining after 10000 ***,the FOSCs gave an efficiency of 14.18%and 16.15%for the PM6:Y6 and PM6:L8-BO devices,which was among the highest performance of *** results demonstrated the potential of improving the mechanical durability of FOSCs through thermoplastic elastomer interface modification.

关键词： elastomer interface durability

基于租房数据的京津冀城市群跨城通勤特征及影响因素研究

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地理科学进展 2024年第5期43卷 841-853页

作者：张纯马畅北京交通大学建筑与艺术学院北京100044 北京交通大学国土空间与交通协同发展研究院北京100044 北京交通大学交通运输学院北京100044

近年来中国城市群都市圈尺度的跨城通勤现象愈加频繁。相对于国际大城市的通勤圈,国内跨城通勤特征与影响因素仍不明晰。论文以京津冀城市群为例,基于贝壳App租房者的双城通勤位置数据,采用基于GIS的OD(origin-destination)分析与空间... 详细信息

近年来中国城市群都市圈尺度的跨城通勤现象愈加频繁。相对于国际大城市的通勤圈,国内跨城通勤特征与影响因素仍不明晰。论文以京津冀城市群为例,基于贝壳App租房者的双城通勤位置数据,采用基于GIS的OD(origin-destination)分析与空间统计分析,考察跨城通勤现象的空间分布特征;并辅以个体通勤时间为因变量的普通最小二乘法(ordinary least squares,OLS)、地理加权回归(geographically weighted regression,GWR)模型,揭示空间变量和个人社会属性综合作用下的影响机制。结果表明:①京津冀城市群的跨城通勤呈现出明显的廊道分布特征,集中在东部、东南与西南三条通勤廊道上;②跨城通勤距离已经超越都市圈传统研究聚焦的30~50 km范围;③跨城通勤群体占租房总量20%以上的地区,位于廊坊燕郊开发区、固安县、保定涿州市等地,形成高频通勤的“环京通勤带”;④跨城通勤个体层面的GWR回归显示了职住两地工资差异、租房价格及居住地到高铁站距离等因素对通勤时间具有空间异质性影响。长时间跨城通勤动机存在差异,部分天津跨城通勤者主要为提高居住质量和工资,而部分廊坊、保定通勤者则为了提高工资和节省房租。研究结果可为新型城镇化战略下的城市群都市圈城镇空间合理布局与综合交通协同优化提供借鉴。

关键词：城市群跨城通勤空间分布职住空间关系 GWR 京津冀

火焰原子吸收光谱法测定电积铜浸出液中铜和铁

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冶金分析 2006年第6期26卷 60-61页

作者：陶明马长英西昌学院生化系西昌学院生化系四川西昌615022

在硫酸介质中,以铜和铁的次灵敏吸收线249.2 nm,302.1 nm为吸收波长,用空气-乙炔火焰原子吸收光谱法测定了电积铜浸出液中铜和铁。对仪器工作条件、硫酸及共存离子的干扰情况等进行了试验。方法用于电积铜浸出液中铜和铁的测定,相对标... 详细信息

在硫酸介质中,以铜和铁的次灵敏吸收线249.2 nm,302.1 nm为吸收波长,用空气-乙炔火焰原子吸收光谱法测定了电积铜浸出液中铜和铁。对仪器工作条件、硫酸及共存离子的干扰情况等进行了试验。方法用于电积铜浸出液中铜和铁的测定,相对标准偏差为3.3%,1.9%;回收率在96.5%-105.0%之间。方法简单,可用于日常分析。

关键词：火焰原子吸收光谱法铜铁电积铜浸出液

模拟MKDV方程的格子Boltzmann方法

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空气动力学学报 2006年第4期24卷 495-497页

作者：马昌凤福建师范大学数学与计算机科学学院

目前,格子Boltzmann方法已被广泛应用于模拟各种非线性物理方程。文中用D1Q2模型给出MKDV方程的带修正项的BGK型格子Boltzmann方法。通过对演化方程的泰勒展开并应用多尺度技术恢复了宏观方程。数值模拟表明文中所建立的模型是有效的。

关键词： MKDV方程格子Boltzmann方法多尺度技术

Large-Scale Finite Difference Grid Generation and Visualization Method Based on Ray Casting Algorithm

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Large-Scale Finite Difference Grid Generation and Visualizat...

Ultra-small hollow ternary alloy nanoparticles for efficient hydrogen evolution reaction

作者： Tie-chang ma Tian-bao ma Li HAO State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology School of Science Beijing University of Civil Engineering and Architecture

Finite difference method（FDM） is one of the most popular method for explosion ***-scale,accuracy and automatic grid generation is the essential for numerical *** kinds of grid generation method are wildly used:ray casting method and slicing *** this paper,the ray casting method is optimized and some special cases of algorithm are analyzed,which improved the efficiency and stability for large-scale grid generation.A facet searching method is proposed to improve the performance of ray casting *** efficient data storage method is proposed for storing and visualizing grid data,which makes it possible to display trillions of *** advantages of modified ray casting algorithm are presented through performance comparison between ray casting and slicing method in different ***,examples of grid generation and explosion simulation are *** accuracy and practicability of algorithm is proved.

关键词： Grid generation Numerical simulation Ray casting algorithm Slicing algorithm

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National Science Review 2021年第7期8卷 185-197页

作者： Zhenxing Li Chengcheng Yu Yikun Kang Xin Zhang Yangyang Wen Zhao-Kui Wang chang ma Cong Wang Kaiwen Wang Xianlin Qu Miao He Ya-Wen Zhang Weiyu Song State Key Laboratory of Heavy Oil Processing College of New Energy and Materials Beijing Key Laboratory of Biogas Upgrading Utilization China University of Petroleum (Beijing) College of Science China University of Petroleum (Beijing) Jiangsu Key Laboratory for Carbon-Based Functional materials and Devices Institute of Functional Nano and Soft Materials (FUNSOM) Soochow University Beijing Key Laboratory and Institute of Microstructure and Property of Advanced materials Beijing University of Technology Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and Applications PKU–HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry College of Chemistry and Molecular Engineering Peking University

Hollow nanoparticles with large specific surface area and high atom utilization are promising catalysts for the hydrogen evolution reaction(HER). We describe herein the design and synthesis of a series of ultra-small hollow ternary alloy nanostructures using a simple one-pot strategy. The same technique was demonstrated for hollow PtNiCu nanoparticles, hollow PtCoCu nanoparticles and hollow CuNiCo nanoparticles. During synthesis, the displacement reaction and oxidative etching played important roles in the formation of hollow structures. Moreover, our hollow PtNiCu and PtCoCu nanoparticles were single crystalline, with an average diameter of 5 nm. Impressively, ultra-small hollow PtNiCu nanoparticles,containing only 10% Pt, exhibited greater electrocatalytic HER activity and stability than a commercial Pt/C catalyst. The overpotential of hollow Pt Ni Cu nanoparticles at 10 ma cm-2was 28 mV versus reversible hydrogen electrode(RHE). The mass activity was 4.54 A mg Pt-1at-70 mV versus RHE, which is 5.62-fold greater than that of a commercial Pt/C system(0.81 A mg Pt-1). Through analyses of bonding and antibonding orbital filling, density functional theory calculations demonstrated that the bonding strength of different metals to the hydrogen intermediate(H*) was in the order of Pt > Co > Ni > Cu. The excellent HER performance of our hollow PtNiCu nanoparticles derives from moderately synergistic interactions between the three metals and H*. This work demonstrates a new strategy for the design of low-cost and high-activity HER catalysts.

关键词： ultra-small hollow nanostructure hydrogen evolution reaction density functional theory

Comparsion of the Effects of Succinate and NADH on Postmortem Metmyoglobin Redcutase Activity and Beef Colour Stability

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Journal of Integrative Agriculture 2014年第8期13卷 1817-1826页

作者： GAO Xiao-guang WANG Zhen-yu TANG Meng-tian ma chang-wei DAI Rui-tong College of Food Science and Nutritional Engineering China Agricultural University College of Biological Science and Engineering Hebei University of Science and Technology Institute of Agro-Products Processing Science and Technology Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Products ProcessingMinistry of Agriculture

In two experiments, the effects of succinate and NADH（reduced nicotinamide adenine dinucleotide） on metmyoglobin reductase activity and electron transport chain-linked metmyoglobin reduction were investigated and compared. In experiment 1, metmyoglobin（MetMb）, substrate and inhibitors were incubated with mitochondria. Comparsion of the effects of succinate and NADH on MetMb reduction was investigated. The MetMb percentage in sample treated with 8 mol L-1 succinate decreased by about 69% after 3 h incubation, and the effect was inhibited by the addition of 10 mol L-1 electron transfer chain complex II inhibitor malonic acid; the MetMb percentage in samples treated with 2 mol L-1 NADH decreased by 56% and the effect was inhibited by the addition of 0.02 mol L-1 electron transport chain complex I inhibitor rotenone. These results indicated that electron transport chain played an important role in MetMb reduction. Both complex II and complex I take part in the MetMb reduction in mitochondria through different pathways. NADH-MetMb reduction system was less stable than succinateMetMb system. In experiment 2, the beef longissimus dorsi muscle was blended with different concentrations of succinate or NADH. Enhancing patties with higher concentration of succinate or NADH improved colour stability in vacuum packaged samples（P〈0.05）. These results verified that mitochondria electron transport chain is related to the MetMb reduction in meat system.

关键词： succinate NADH malonic acid rotenone metmyoglobin electron transport chain

Chinese Guidelines for the Diagnosis and management of Atrial Fibrillation

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Journal of Geriatric Cardiology 2024年第3期21卷 251-314页

作者： chang-Sheng ma Shu-Lin WU Shao-Wen LIU Ya-Ling HAN Chinese Society of Cardiology Chinese Medical Association Heart Rhythm Committee of Chinese Society of Biomedical Engineering Beijing Anzhen Hospital Capital Medical University Guandong Provincial People’s Hospital Shanghai First People’s Hospital General Hospital of Northern Theater Command 不详

Atrial fibrillation(AF)is the most common sustained cardiac arrhythmia,significantly impacting patients’quality of life and increasing the risk of death,stroke,heart failure,and *** the past two decades,there have been significant breakthroughs in AF risk prediction and screening,stroke prevention,rhythm control,catheter ablation,and integrated *** this period,the scale,quality,and experience of AF management in China have greatly improved,providing a solid foundation for the development of guidelines for the diagnosis and management of *** further promote standardized AF management,and apply new technologies and concepts to clinical practice in a timely and comprehensive manner,the Chinese Society of Cardiology of the Chinese Medical Association and the Heart Rhythm Committee of the Chinese Society of Biomedical Engineering have jointly developed the Chinese Guidelines for the Diagnosis and management of Atrial *** guidelines have comprehensively elaborated on various aspects of AF management and proposed the CHA2DS2-VASc-60 stroke risk score based on the characteristics of AF in the Asian *** guidelines have also reevaluated the clinical application of AF screening,emphasized the significance of early rhythm control,and highlighted the central role of catheter ablation in rhythm control.

关键词： prevention sustained diagnosis

Heron Triangle and Diophantine Equation

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Chinese Quarterly Journal of mathematics 2005年第3期20卷 242-246页

作者： YANG Shi-chun ma chang- wei Department of mathematics Aba Teacher＇s College Wenehuan 623000 China

In this paper, we study the quantic Diophantine equation （1） with elementary geometry method, therefore all positive integer solutions of the equation （1） are obtained, and existence of Heron triangle whose median... 详细信息

关键词： quantic Diophantine equation positive integer solution Heron triangle median