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Experimental and numerical study of combustion characteristics of ammonia-hydrogen-air swirling flame with/without secondary air injection

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Chinese Journal of Aeronautics 2024年第4期37卷 243-255页

作者： Chunyu LIU Chenhu GAO Yue HUANG Hua JIN Dan ZHAO Wenjiang XU yancheng YOU School of Aerospace Engineering Xiamen UniversityXiamen 361005China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical Engineering University of CanterburyChristchurch 8041New Zealand

Ammonia (NH_(3)) is currently considered to be a potential carbon-free alternative fuel,and its large-scale use as such would certainly decrease greenhouse gas emissions and meet increasingly stringent emission *** the low flame propagation speed and high NO production of NH_(3) hinder its direct application as a renewable fuel,co-combustion of NH_(3)–H_(2)is an effective way to overcome these *** this study,the combustion characteristics of NH_(3)–H_(2)swirling flames under different equivalence ratios and H_2blending ratios conditions are both numerically and experimentally ***,the One-Dimensional (1.) laminar flame computation presents a comparison base and the Three-Dimensional (3D) numerical simulation yields detailed flame property ***,the high-speed camera takes instantaneous swirl flame images and the gas analyzer measures the NO emission at the exit plane of the flame *** and quantitative analysis is performed on the flame structure and NO emission for a series of NH_(3)–H_(2)swirl *** variation trends of the NO emission calculated using different techniques agree very *** quantitative results show that the NO emissions are much higher at lean equivalence ratios than those at rich equivalence ratios,and such difference is closely related to the combustion flame ***,it is shown that the utilization of secondary air injection can achieve a significant reduction in NO emissions at the exit of the combustion chamber at equivalence ratios less than or equal to 0.9.

关键词： Ammonia combustion Swirling flow NO emission characteristics Secondary combustion Chemical reaction mechanism

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Tissue adhesive,ROS scavenging and injectable PRP-based‘plasticine’for promoting cartilage repair

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Regenerative Biomaterials 2024年第1期3卷 94-107页

作者： Shiao Li Dawei Niu Haowei Fang yancheng Chen Jinyan Li Kunxi Zhang Jingbo Yin Peiliang Fu Department of Orthopedics Shanghai Changzheng HospitalNaval Medical UniversityShanghai 200003P.R.China Department of Polymer Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444P.R.China

Platelet-rich plasma(PRP)that has various growth factors has been used clinically in cartilage ***,the short residence time and release time at the injury site limit its therapeutic *** present study fabricated a granular hydrogel that was assembled from gelatin microspheres and tannic acid through their abundant hydrogen *** microspheres with the gelatin concentration of 1.wt%and the diameter distribution of 1.1. lm were used to assemble by tannic acid to form the granular hydrogel,which exhibited elasticity under low shear strain,but flowability under higher shear *** viscosity decreased with the increase in shear ***,the granular hydrogel exhibited self-healing feature during rheology ***,granular hydrogel carrying PRP not only exhibited well-performed injectability but also performed like a‘plasticine’that possessed good *** granular hydrogel showed tissue adhesion ability and reactive oxygen species scavenging *** hydrogel carrying PRP transplanted to full-thickness articular cartilage defects could integrate well with native cartilage,resulting in newly formed cartilage articular fully filled in defects and well-integrated with the native cartilage and subchondral *** unique features of the present granular hydrogel,including injectability,plasticity,porous structure,tissue adhesion and reactive oxygen species scavenging provided an ideal PRP carrier toward cartilage tissue engineering.

关键词： cartilage regeneration granular hydrogel gelatin tannic acid PRP

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Hybrid 2D/3D Graphitic Carbon Nitride-Based High-Temperature Position-Sensitive Detector

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Energy & Environmental Materials 2024年第1期7卷 275-283页

作者： Xuexia Chen Dongwen Yang Xun Yang Qing Lou Zhiyu Liu yancheng Chen Chaofan Lv Lin Dong Chongxin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China

Ultraviolet position-sensitive detectors(PSDs)are expected to undergo harsh environments,such as high temperatures,for a wide variety of applications in military,civilian,and ***,no report on relevant PSDs operating at high temperatures can be found up to ***,we design a new 2D/3D graphitic carbon nitride(g-C_(3)N_(4))/gallium nitride(GaN)hybrid heterojunction to construct the ultraviolet high-temperature-resistant *** g-C_(3)N_(4)/GaN PSD exhibits a high position sensitivity of 355 mV mm^(-1.,a rise/fall response time of 1.7/2.3 ms,and a nonlinearity of 0.5%at room *** ultralow formation energy of-0.91. eV atom^(-1.has been obtained via the thermodynamic phase stability calculations,which endows g-C_(3)N_(4)with robust stability against *** merits of the strong built-in electric field of the 2D/3D hybrid heterojunction and robust thermo-stability of g-C_(3)N_(4),the g-C_(3)N_(4)/GaN PSD delivers an excellent position sensitivity and angle detection nonlinearity of 31. mV mm^(-1.and 1.4%,respectively,with high repeatability at a high temperature up to 700 K,outperforming most of the other counterparts and even commercial silicon-based *** work unveils the high-temperature PSD,and pioneers a new path to constructing g-C_(3)N_(4)-based harsh-environment-tolerant optoelectronic devices.

关键词： graphitic carbon nitride high-temperature stability lateral photovoltaic effect position-sensitive detectors two-dimensional materials

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Experimental study of population density using an optimized random forest model

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Journal of Geographical Sciences 2024年第8期34卷 1636-1656页

作者： LI Lingling LIU Jinsong LI Zhi WEN Peizhang LI yancheng LIU Yi School of Geographical Sciences Hebei Normal UniversityShijiazhuang 050024China Hebei Technology Innovation Center for Remote Sensing Identification of Environmental Change Shijiazhuang 050024China Geocomputation and Planning Center of Hebei Normal University Shijiazhuang 050024China Hebei Key Laboratory of Environmental Change and Ecological Construction Shijiazhuang 050024China

Random forest model is the mainstream research method used to accurately describe the distribution law and impact mechanism of regional *** took Shijiazhuang as the research area,with comprehensive zoning based on endowments as the modeling unit,conducted stratified sampling on a hectare grid cell,and systematically carried out incremental selection experiments of population density impact factors,optimizing the population density random forest model throughout the process(zonal modeling,stratified sampling,factor selection,weighted output).The results are as follows:(1.Zonal modeling addresses the issue of confusion in population distribution laws caused by a single *** on a grid cell not only ensures the quality of training data by avoiding the modifiable areal unit problem(MAUP)but also attempts to mitigate the adverse effects of the ecological *** sampling ensures the stability of population density label values(target variable)in the training sample.(2)Zonal selection experiments on population density impact factors help identify suitable combinations of factors,leading to a significant improvement in the goodness of fit(R^(2))of the zonal models.(3)Weighted combination output of the population density prediction dataset substantially enhances the model's robustness.(4)The population density dataset exhibits multi-scale superposition *** a large scale,the population density in plains is higher than that in mountainous areas,while on a small scale,urban areas have higher density compared to rural *** optimization scheme for the population density random forest model that we propose offers a unified technical framework for uncovering local population distribution law and the impact mechanisms.

关键词： population density random forest model endowment zones stratified sampling factor selection weighted output

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Embedding Perovskite in Polymer Matrix Achieved Positive Temperature Response with Inversed Temperature Crystallization

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Energy & Environmental Materials 2024年第5期7卷 361-371页

作者： Meiting Peng Xue Guan Yingzhu Wu Nan Zhang Qi Feng Liyong Tian yancheng Wu Yangfan Zhang Feng Gan Fuqin Deng Meilin Huang Guichuan Xing Ningbo Yi college of Textile Science and Engineering Wuyi University Institute of Applied Physics and Materials Engineering University of Macau School of Applied Physics and Materials Wuyi University Faculty of Intelligent Manufacturing Wuyi University

Organic perovskites are promising semiconductor materials for advanced photoelectric applications. Their fluorescence typically shows a negative temperature coefficient due to bandgap change and structural instability. In this study, a novel perovskite-based composite with positive sensitivity to temperature was designed and obtained based on its inverse temperature crystallization, demonstrating good flexibility and solution processability. The supercritical drying method was used to address the limitations of annealing drying in preparing high-performance perovskite. Optimizing the precursor composition proved to be an effective approach for achieving high fluorescence and structural integrity in the perovskite material. This perovskite-based composite exhibited a positive temperature sensitivity of28.563%℃-1.or intensity change and excellent temperature cycling reversibility in the range of 25–40℃in an ambient environment. This made it suitable for use as a smart window with rapid response. Furthermore, the perovskite composite was found to offer temperature-sensing photoluminescence and flexible processability due to its components of perovskite-based compounds and polyethylene oxide. The organic precursor solvent could be a promising candidate for use as ink to print or write on various substrates for optoelectronic devices responding to temperature.

关键词： flexibility inversed temperature crystallization perovskite positive temperature response

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BGP reflection functors in root categories

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Science china Mathematics 2005年第8期48卷 1033-1045页

作者： XIAO Jie, ZHANG Guanglian1.2 & ZHU Bin Department of Mathematical Sciences, Tsinghua University, Beijing 1.0084, china Department of Mathematics,{1., yancheng 2.4002. china 1. Department of Mathematical Sciences Tsinghua University 100084 Beijing China 2. Department of Mathematics Yancheng Teachers College 224002 Yancheng China

We define the BGP-reflection functors in the derived categories and the root categories. By Ringel's Hall algebra approach, the BGP-reflection functor is applicable to obtain the classical Weyl group action on the Lie... 详细信息

关键词： m-cycle complexes, derived categories, BGP-reflections, Kac-Moody algebras.

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The Green formula and heredity of algebras

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Science china Mathematics 2005年第5期48卷 610-617页

作者： ZHANG Guanglian & WANG Shuai Department of Mathematical Sciences, Tsinghua University, Beijing 1.0084, {1. {1. teachers college, yancheng 2.4002. china Department of Mathematics, Johns Hopkins University, Baltimore, MD21.1., U.S.A. 1. Department of Mathematical Sciences Tsinghua University 100084 Beijing China 2. yancheng teachers college 224002 Yancheng China 3. Department of Mathematics Johns Hopkins University 21218 Baltimore MD USA

Let A be a finite dimensional algebra over a field k with q elements. It is shown that the Green formula is true in mod-A if and only if A is a hereditary algebra.

关键词： Green formula idempotent ideal hereditary algebra.

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生物质平台化合物催化转化制备芳香多元羧酸研究进展

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洁净煤技术 2024年第1期30卷 87-100页

作者：呼延成张文静曹景沛中国矿业大学化工学院徐州221116

芳香多元羧酸,如对苯二甲酸、邻苯二甲酸、偏苯三甲酸、均苯三甲酸、均苯四甲酸等是重要的大宗化学品,可以制备各种聚合物材料,在日常生活的各个领域应用广泛。工业上,这些芳香多元羧酸是以石油基衍生的芳香烃为原料进行高温高压催化氧... 详细信息

芳香多元羧酸,如对苯二甲酸、邻苯二甲酸、偏苯三甲酸、均苯三甲酸、均苯四甲酸等是重要的大宗化学品,可以制备各种聚合物材料,在日常生活的各个领域应用广泛。工业上,这些芳香多元羧酸是以石油基衍生的芳香烃为原料进行高温高压催化氧化获得。在双碳背景下,开发利用可再生生物质替代传统化石能源生产芳香多元羧酸具有重要的现实意义。生物质转化过程是首先在化学或生物催化下,将生物质降解到一系列C1.C6的平台化合物,然后再通过这些化合物之间的耦合转化制备工业化学品。详细总结了生物质平台化合物催化转化制备芳香多元羧酸的研究进展。这些工作的创新点是开拓新的生物质基合成工艺来生产芳香多元羧酸,关键挑战步骤是芳环的构建。针对该难点,成功开发了两种策略:①呋喃类分子与烯烃的Diels-Alder反应与后续脱水芳构化反应;②醇脱水生成共轭二烯烃,再与烯烃进行Diels-Alder反应以及后续的脱氢芳构化反应。按所生产芳香多元羧酸的种类进行分类,包括对苯二甲酸、苯酐/邻苯二甲酸、苯三甲酸以及均苯四甲酸。研究为生物质催化转化新体系的研发与工艺过程优化提供借鉴。

关键词：芳香多元羧酸生物质催化转化平台化合物 Diels-Alder反应脱氢反应

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顶层设计,还是自然生长?——数字资源编排方向的前因组态研究

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科学学与科学技术管理 2024年第9期45卷 35-51页

作者：赖晓烜陈衍泰范彦成浙江工业大学管理学院杭州310014 浙江工商大学管理学院杭州310018 浙江财经大学经济学院杭州310018

如何通过资源编排行动促进多维数字能力间的构建协同,是企业取得数字化转型高绩效的重要基础。资源编排视角有利于揭示多维数字能力间协同与耦合的过程,发现组织选择自上而下的顶层设计,还是自下而上的自然生长策略的决策逻辑。囿于现... 详细信息

如何通过资源编排行动促进多维数字能力间的构建协同,是企业取得数字化转型高绩效的重要基础。资源编排视角有利于揭示多维数字能力间协同与耦合的过程,发现组织选择自上而下的顶层设计,还是自下而上的自然生长策略的决策逻辑。囿于现有研究在多维数字能力间均质线性与和谐耦合的假设,未能充分解释多维数字能力在冲突中非线性的发展现象;资源编排的对称式前因研究,也难以揭示多前因共存依赖下差异化发展路径的机理及演化规律。研究采用“环境—组织—注意力”的研究框架,选取浙江省“未来工厂”中分属不同转型阶段的96家企业,运用基于时间序列定性比较分析的方法探讨了数字化转型中怎样的前因组合能促进多维数字能力的构建协同,以实现高绩效数字化转型。研究发现:(1.单因素不构成高绩效的必要条件,多样化组态构成多条非对称高(非高)绩效路径;(2)各前因要素在各阶段演化呈现规律性特征;(3)编排方向呈现从“自下而上”启始,双向分化后趋于“双向流”汇聚的发展趋势。

关键词：数字化转型多维数字能力资源编排方向注意力结构组态演化

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Explicit expressions and recurrence formulas of radial average value for N-dimensional hydrogen atom

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原子与分子物理学报 2002年第2期19卷 201-204页

作者： CHEN Chang-yuan, SUN Dong-sheng, LIU You-we, LIU Cheng-lin(Department of Physics, yancheng teachers college,{{1.) Department of Physics Yancheng Teachers College Yancheng 224002

In this paper, two recurrence formulas for radial average values of N-dimensional hydrogen atom are derived. Explicit expressions for are given for 3≥s≥-6. These results can be applied to discuss average value of centrifugal potential energy and other physical quantities. The relevant results of the usual hydrogen atom are contained in more general conclusion of this paper as special cases.

关键词：量子力学循环准则氢原子电离

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