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Cross-linkable fullerene interfacial contacts for enhancing humidity stability of inverted perovskite solar cells

Rare Metals 2021年第7期40卷 1691-1697页

作者： Ming-Wei An Zhou Xing Bao-shan Wu Fang-Fang Xie shan-Yu Zheng Lin-Long Deng Xu Wang Bin-Wen Chen da-Qin Yun Su-Yuan Xie Rong-Bin Huang Lan-Sun Zheng State Key Laboratory for Physical Chemistry of Solid Surfaces iChEM(Collaborative Innovation Center of Chemistry for Energy Materials)Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China College of Energy Xiamen UniversityXiamen 361005China

In situ cross-linking encapsulation has been demonstrated to be an efficient strategy for enhancing the humidity stability of perovskite solar cells(PSCs).In this study,a novel cross-linkable fullerene derivative,namely1-(p-benzoate-(p-methylvinylbenzene)-indolino[2,3][60]fullerene(FPPS),was readily synthesized from commercially available building blocks in two *** FPPS was employed as an interfacial modifier on perovskite surfaces in inverted planar p-i-n *** to the fast interfacial charge extraction and efficient trap passivation,PSCs based on the cross-linked FPPS(C-FPPS)exhibited excellent *** PSCs had a top-performing power conversion efficiency(PCE)of 17.82%with negligible hysteresis,compared to the control devices without C-PFFS(16.99%).Moreover,the strong water resistance of the C-FPPS interfacial layer distinctly enhances the ambient stability of PSC devices,exhibiting a t80(the time required to reach 80%of the initial PCE)of 300 h under high-humidity *** significantly surpasses the control devices,whose t80 was only 130 *** results demonstrate that cross-linkable fullerene derivatives can be promising interfacial materials for designing high-efficiency,hysteresis-free,air-stable PSCs.

关键词： Perovskite solar cells Cross-linkable fullerene Fullerene interlayer Power conversion efficiency Humidity stability

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jiles-Atherton磁滞模型仿真分析

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北华航天工业学院学报 2024年第3期34卷 5-7页

作者：刘珊刘莉北华航天工业学院机电工程学院河北廊坊065000 北华航天工业学院电子与控制工程学院河北廊坊065000

磁化方法在钢板试件无损检测中已广泛应用,但对于磁化过程试件内部磁化状态的分析仍待解决。针对该问题,本文提出基于jiles-Atherton的钢板试件交流磁化状态分析。推导了磁滞磁化模型的计算过程。结合j-A磁滞磁化理论,建立有限元仿真模... 详细信息

磁化方法在钢板试件无损检测中已广泛应用,但对于磁化过程试件内部磁化状态的分析仍待解决。针对该问题,本文提出基于jiles-Atherton的钢板试件交流磁化状态分析。推导了磁滞磁化模型的计算过程。结合j-A磁滞磁化理论,建立有限元仿真模型,利用交流线圈周期性磁化钢板试件,得到钢板内部磁化强度分布,为磁化方法在无损检测中的应用提供理论支撑。

关键词：交流磁化钢板

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Synthesis and Properties of Hydroxytelechelic Polyisobutylenes by End Capping with tert-Butyl-dimethyl-(4-methyl-pent-4-enyloxy)-silane

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Chinese journal of Polymer Science 2019年第9期37卷 936-942页

作者： jing Li Kang-da Wu Huang shan jing-Han Zhang Ming Zhao Guang-Bi Gong Wen-Li Guo Yi-Bo Wu College of Materials Science & Engineering Beijing Institute of Petrochemical Technology Beijing 102617 China Lanzhou Petrochemical Research Center Petrochina Lanzhou 730060 China Beijing Key Laboratory of Specialty Elastomer Composite Materials Beijing Institute of Petrochemical Technology Beijing 102617 China

The low-activity cationic monomer tert-butyl-dimethyl-(4-methyl-pent-4-enyloxy)-silane was synthesized by Grignard reaction and hydroxyl-protection reaction. Living polyisobutylene chains were initially synthesized by controlled cationic polymerization and then capped with tert-butyl-dimethyl-(4-methyl-pent-4-enyloxy)-silane. The hydrolysis of these polyisobutylenes end capped with tert-butyl-dimethyl-(4-methyl-pent-4-enyloxy)-silane gave rise to hydroxytelechelic polyisobutylene. NMR analysis confirmed that the hydrolysis was complete. Results also showed that a low polymerization temperature favored the participation of tert-butyl-dimethyl-(4- methyl-pent-4?enyloxy)-silane in the end-capping reaction. Moreover, polyisobutylene-based polyurethane exhibited greater acid resistance than commercial polyurethane.

关键词： Carbocationic polymerization Polyisobutylene Hydrolysis Polyisobutylene-based polyurethane

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化学镀镍硼镀层的研究进展

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表面技术 2024年第14期53卷 32-44页

作者：张雅鑫袁炜刘圆敬黄雄刘丹单大勇广州大学物理与材料科学学院广州510006 广东腐蚀科学与技术创新研究院广州510530 中国核电工程有限公司北京400840

化学镀镍硼镀层是通过化学镀的表面处理方法在基材表面沉积的一种镍硼合金层。对近20年化学镀以及镍硼镀层的文章发表情况进行了统计,介绍了典型镍硼镀层的沉积过程和不同还原剂下的沉积原理,探讨了还原剂与硼含量对工艺和性能的影响。... 详细信息

化学镀镍硼镀层是通过化学镀的表面处理方法在基材表面沉积的一种镍硼合金层。对近20年化学镀以及镍硼镀层的文章发表情况进行了统计,介绍了典型镍硼镀层的沉积过程和不同还原剂下的沉积原理,探讨了还原剂与硼含量对工艺和性能的影响。相比传统制备工艺,如今镍硼镀层的工艺研究有了许多新的进展。近些年来,通过对绿色环保的新型稳定剂和无稳定剂镀液体系的探索、加速剂和表面活性剂的合理使用、等离子体氮化等后处理方法的应用、多层镀层与复合镀层以及三元合金镀层的深入探索,化学镀镍硼的工艺研究发展迅速,其应用范围也在原本对耐磨、耐腐蚀性能需求较高的传统领域之外,拓展出了电子工业、特种材料工业等新兴领域。目前,在化学镀镍的所有镀层中,镍硼镀层的硬度最高,除这些传统性能外,镍硼镀层还具有高反射率、低电阻率和优秀的磁性能。综述了化学镀镍硼镀层在基础理论研究、工艺研究、性能及应用研究3个方面的成果与进展,指出了未来镍硼镀层的再处理再循环工艺、工业化、原料成本等在环保、技术、经济方面可能遇到的一些机遇、挑战和有待改善之处,展望了未来镍硼镀层研究的关注重点和发展趋势。

关键词：化学镀镍硼合金文献综述工艺研究性能应用

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Natural history,clinical characteristics,outcomes,and long-term follow-up of pain-free chronic pancreatitis

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Gastroenterology Report 2023年第1期11卷 309-315页

作者： Awais Ahmed Ishani Shah Rachel Bocchino Steven D.Freedman da.shan j.kothari Sunil G.Sheth Department of Medicine Division of GastroenterologyBeth Israel Deaconess Medical CenterHarvard Medical SchoolBostonMAUSA Department of Medicine Division of Internal MedicineBeth Israel Deaconess Medical CenterHarvard Medical SchoolBostonMAUSA Department of Medicine Division of GastroenterologyDuke UniversityDurhamNCUSA

Background:Chronic pancreatitis(CP)is characterized by chronic abdominal pain and functional ***,a small subset of patients with prior acute pancreatitis(AP)and/or underlying risk factors for developing CP may be pain-free at diagnosis and may have a different clinical *** aimed to compare the clinical characteristics,outcomes,and healthcare utilization between CP patients with and without ***:Reviewed patients with established CP were followed in our Pancreas Center between january 2016 and April *** without risk factors for developing CP and/or without AP prior to their diagnosis and only with incidental radiologic features of CP were excluded,so as tominimize confounding factors of pancreatopathy unrelated to *** were divided into painful and pain-free groups to analyze differences in demographics,outcomes,and healthcare ***:Of 368 CP patients,49(13.3%)were pain-free at diagnosis and had remained so for>9 *** were no significant differences in body mass index,race,sex,or co-morbidities between the two ***-free patients were older at diagnosis(53.9 vs 45.7,P=0.004)and had less recurrent AP(RAP)(43.8%vs 72.5%,P<0.001)and less exocrine pancreatic insufficiency(EPI)(34.7%vs 65.7%,P<0.001).Pain-free patients had less disability(2.2%vs 22.0%,P=0.003),mental illness(20.4%vs 61.0%,P<0.001),surgery(0.0%vs 15.0%,P=0.059),and therapeutic interventions(0.0%vs 16.4%,P=0.005)for ***:We described a unique subset of patients with underlying risk factors for CP and/or prior AP who were painfree at *** were older at diagnosis,had less EPI and RAP,and overall favorable outcomes with minimal resource utilization.

关键词： chronic pancreatitis pain-free pancreatic insufficiency diabetes

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Shedding light on neurons:optical approaches for neuromodulation

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National Science Review 2022年第10期9卷 34-54页

作者： shan jiang Xiang Wu Nicholas j.Rommelfanger Zihao Ou Guosong Hong Department of Materials Science and Engineering Stanford University Wu Tsai Neurosciences Institute Stanford University Department of Applied Physics Stanford University

Today’ s optical neuromodulation techniques are rapidly evolving,benefiting from advances in photonics,genetics and materials *** this review,we provide an up-to-date overview of the latest optical approaches for *** begin with the physical principles and constraints underlying the interaction between light and neural *** then present advances in optical neurotechnologies in seven modules:conventional optical fibers,multifunctional fibers,optical waveguides,light-emitting diodes,upconversion nanoparticles,optical neuromodulation based on the secondary effects of light,and unconventional light sources facilitated by ultrasound and magnetic *** conclude our review with an outlo ok on new methods and mechanisms that afford optical neuromodulation with minimal invasiveness and footprint.

关键词： optical neuromodulation optogenetics neural interfaces

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考虑旅客群体出行偏好的高铁客流分配方法

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铁路计算机应用 2024年第8期33卷 12-18页

作者：单杏花赵烁中国铁道科学研究院集团有限公司电子计算技术研究所北京100081

针对不同旅客出行群体(简称:群体)的出行偏好进行客流分配研究,考虑各群体对出行过程各环节的敏感度差异,定义各群体主观出行成本。构造“时间—空间—群体”三维出行网络,描述各群体旅客出行过程的不同出行行为,并设计出行网络费用;基... 详细信息

针对不同旅客出行群体(简称:群体)的出行偏好进行客流分配研究,考虑各群体对出行过程各环节的敏感度差异,定义各群体主观出行成本。构造“时间—空间—群体”三维出行网络,描述各群体旅客出行过程的不同出行行为,并设计出行网络费用;基于列车定员约束构建网络流模型,描述各群体出行选择和运力占用过程,求解各群体层出行路径的客流分布状态;通过对京兰(北京—兰州)高速铁路京呼段(北京北—呼和浩特东)客流分配算例分析表明,不同群体出行偏好对客流分布和客流转移具有显著影响。该客流分配方法不仅能够很好地描述各出行群体对不同出行方案的敏感性,刻画各群体间旅客对有限运力资源的竞争博弈过程,还可以评价运力配置,对铁路客运运力调整和客运产品设计具有参考意义。

关键词：高速铁路客流分配出行群体出行偏好网络流模型

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CH_4 Oxidation Potentials of Diferent Land Uses in Three Gorges Reservoir Area of Central Subtropical China

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Pedosphere 2013年第5期23卷 609-619页

作者： j. IQBAL LIN shan HU Rong-Gui ZHAO jin-Song College of Resources and Environment Huazhong Agricultural University Department of Agronomy Iowa State University

To compare the CH4 oxidation potential among different land uses and seasons, and to observe its response to monsoon precipi- tation pattern and carbon and nitrogen parameters, a one-year study was conducted for different land uses （vegetable field, tilled and non-tilled orchard, upland crops and pine forest） in central subtropical China. Results showed significant differences in CH4 oxidation potential among different land uses （ranging from -3.08 to 0.36 kg CH4 ha-1 year-l）. Upland with corn-peanut-sweet potato rotation showed the highest CH4 emission, while pine forest showed the highest CH4 oxidation potential among all land uses. Non-tilled citrus orchard （-0.72 ~ 0.08 kg CHa ha-1 year-1） absorbed two times more CH4 than tilled citrus orchard （-0.38 ~ 0.06 kg CH4 ha-1 year-l）. Irrespective of different vegetation, inorganic N fertilizer application significantly influenced CH4 fluxes across the sites （R2 ： 0.86, P -- 0.002）. Water-filled pore space, soil microbial biomass carbon, and dissolved nitrogen showed significant effects across different land uses （31% to 38% of variability） in one linear regression model. However, their cumulative interaction was significant for pine forest only, which might be attributed to undisturbed microbial communities legitimately responding to other variables, leading to net CH4 oxidation in the soil. These results suggested that i） natural soil condition tended to create win-win situation for CH4 oxidation, and agricultural activities could disrupt the oxidation potentials of the soils; and ii） specific management practices including but not limiting to efficient fertilizer application and utilization, water use efficiency, and less soil disruption might be required to increase the CH4 uptake from the soil.

关键词： CH4 emission CH4 fluxes dissolved nitrogen microbial biomass water-filled pore space

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Synthesis and Bioassay of 4-Substituted 2-Oxoglutaric Acids

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Chinese Chemical Letters 2006年第2期17卷 156-158页

作者： Qiu Yun CHEN Qing shan LIU Christopher j. SCHOFIELD Department of Chemistry Huangshan University Tunxi 245021 Department of Chemistry University of Oxford South Park Road Oxford OX1 3TA UK

Three 2-oxoglutaric acid analogues were synthesized. Their interaction with factor- inhibiting hypoxia-inducible factor （FIH） was studied using LC-MS method. The results show that hydrophobic substitutes of 2-oxoglu... 详细信息

关键词： 2-Oxoglutatic acid analogues inhibitor.

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A generic framework for geotechnical subsurface modeling with machine learning

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journal of Rock Mechanics and Geotechnical Engineering 2022年第5期14卷 1366-1379页

作者： jiawei Xie jinsong Huang Cheng Zeng shan Huang Glen j.Burton Discipline of Civil Surveying and Environmental EngineeringPriority Research Centre for Geotechnical Science and EngineeringThe University of NewcastleCallaghanNSW2308Australia ATC Williams Pty.Ltd. SingletonNSW2330Australia

This study introduces a generic framework for geotechnical subsurface modeling, which accounts for spatial autocorrelation with local mapping machine learning(ML) methods. Instead of using XY coordinate fields directly as model input, a series of autocorrelated geotechnical distance fields(GDFs) is designed to enable the ML models to infer the spatial relationship between the sampled locations and unknown locations. The whole framework using GDF with ML methods is named GDF-ML. This framework is purely data-driven which avoids the tedious work in the scale of fluctuations(SOFs)estimating and data detrending in the conventional spatial interpolation methods. Six local mapping ML methods(extra trees(ETs), gradient boosting(GB), extreme gradient boosting(XGBoost), random forest(RF), general regression neural network(GRNN) and k-nearest neighbors(KNN)) are compared in the GDF-ML framework. The results show that the GDFs are better than the conventional XY coordinate fields based ML methods in both accuracy and spatial continuity. GDF-ML is flexible which can be applied to high-dimensional, multi-variable and incomplete datasets. Among these six methods, GDF with ET method(GDF-ET) clearly shows the best accuracy and best spatial continuity. The proposed GDF-ET method can provide a fast and accurate interpretation of the soil property profile. Sensitivity analysis shows that this method is applicable to very small training dataset size. The associated statistical uncertainty can also be quantified so that the reliability of the subsurface modeling results can be estimated objectively and explicitly. The uncertainty results clearly show that the prediction becomes more accurate when more sampled data are available.

关键词： Site investigation Machine learning(ML) Spatial interpolation Geotechnical distance fields(GDFs) Tree-based models

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