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Mechanistic-empirical pavement design guide(MEPDG):a bird's-eye view

Journal of Modern Transportation 2011年第2期19卷 114-133页

作者： Qiang LI danny x. xiao Kelvin C. P. WANG Kevin D. HALL Yanjun QIU Department of Civil and Environmental Engineering University of Delaware Newark DE 19 711 USA Department of Civil Engineering University of Arkansas Fayetteville AR 72701 USA School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China

Past editions of the American Association of State Highway and Transportation Officials （AASHTO） Guide for Design of Pavement Structures have served well for several decades; nevertheless, many serious limitations ex.st for their continued use as the nation＇s primary pavement design procedures. Researchers are now incorporating the latest advances in pavement design into the new Mechanistic-Empirical Pavement Design Guide （MEPDG）, developed under the National Cooperative Highway Research Program （NCHRP） 1-37A project and adopted and published by AASHTO. The MEPDG procedure offers several dramatic improvements over the current pavement design guide and presents a new paradigm in the way pavement design is performed. However, MEPDG is substantially more complex.than the AASHTO Design Guide by considering the input parameters that influence pavement performance, including traffic, climate, pavement structure and material properties, and applying the principles of engineering mechanics to predict critical pavement responses. It requires significantly more input from the designer. Some of the required data are either not tracked previously or are stored in locations not familiar to designers, and many data sets need to be preprocessed for use in the MEPDG. As a result, tremendous research work has been conducted and still more challenges need to be tackled both in federal and state levels for the full implementation of MEPDG. This paper, for the first time, provides a comprehensive bird＇s eye view for the MEPDG procedure, including the evolvement of the design methodology, an overview of the design philosophy and its components, the research conducted during the development, improvement, and implementation phases, and the challenges remained and future developments directions. It is anticipated that the efforts in this paper aid in enhancing the mechanistic-empirical based pavement design for future continuous improvement to keep up with changes in trucking, materials, c

关键词： design of pavement structures mechanistic-empirical pavement design guide (MEPDG) local calibration implementation challenges

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MOF-mediated synthesis of novel PtFeCoNiMn high-entropy nanoalloy as bifunctional ox.gen electrocatalysts for zinc-air battery

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Nano Research 2024年第6期17卷 5288-5297页

作者： Mingkuan x.e x.n xiao Duojie Wu Cheng Zhen Chunsheng Wu Wenjuan Wang Hao Nian Fayan Li Meng danny Gu Qiang x. Shenzhen Key Laboratory of Micro/Nano-Porous Functional Materials(SKLPM) Shenzhen 518055China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China SUSTech-Kyoto University Advanced Energy Materials Joint Innovation Laboratory(SKAEM-JIL) Shenzhen 518055China Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of Guangdong Southern University of Science and TechnologyShenzhen 518055China Eastern Institute for Advanced Study Eastern Institute of TechnologyNingbo 315200China

High-entropy alloy(HEA)-based materials are ex.ected to be promising ox.gen electrocatalysts due to their ex.eptional *** electronic structure regulation of HEAs plays a pivotal role in enhancing their elctrocatalytic ***,PtFeCoNiMn nanoparticles(NPs)with subtle lattice distortions are constructed on metal-organic framework-derived nitrogen-doped carbon by an ultra-rapid Joule heating *** to the modulated electronic structure and the inherent cocktail effect of HEAs,the as-synthesized PtFeCoNiMn/NC ex.ibits superior bifunctional electrocatalytic performance with a positive half-wave potential of 0.863 V *** hydrogen electrode(RHE)for ox.gen reduction reaction and a low overpotential of 357 mV at 10 mA·cm^(-2)for ox.gen evolution *** assembled quasi-solid-state zinc-air battery using PtFeCoNiMn/NC as air electrode shows a high peak power density of 192.16 mW·cm^(-2),low charge−discharge voltage gap,and ex.ellent durability over 500 cycles at 5 mA·cm^(-2).This work demonstrates an effective route for rational design of bifunctional nanostructured HEA electrocatalysts with favorable electronic structures,and opens up a fascinating directions for energy storage and conversion,and beyond.

关键词： ox.gen reduction reaction ox.gen evolution reaction high-entropy nano-alloy zinc-air battery

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Nanostructured Thermal Spray Feedstocks:the Nex. Generation of Engineered Coatings

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材料科学与工程学报 2000年第Z2期20卷 550-555页

作者： T.danny xiao Inframat(R) Corporation 20 Washington Ave. Suite 106 North Haven CT 06473 USA.

This paper presents an overview of the recent research activities at lnframat(R)Corporation(IMC)on the development of thermal spray processes for nanostructured coatings, which enable improved performance and durability of coated components. Designed multifunctional nanocoatings present unprecedented opportunities for advances in materials properties and performance for a broad range of engineered surface *** technology described in this paper involves the reconstitution of individual nanoparticles into sprayable micron-sized agglomerates, followed by the thermal spray of these agglomerated granules into a high performance nanostructured *** important feature of the nanostructured coatings is their improved toughness,contributing to a significant improvement in wear resistance.

关键词： thermal spray nanostructured coating high performance wear resistance spray processes range of

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ePlant for quantitative and predictive plant science research in the big data era --Lay the foundation for the future model guided crop breeding, engineering and agronomy

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Frontiers of Electrical and Electronic Engineering in China 2017年第3期5卷 260-271页

作者： Yi xiao Tiangen Chang Qingfeng Song Shuyue Wang danny Tholen Yu Wang Changpeng x.n Guangyong Zheng Honglong Zhao x.n-Guang Zhu Shanghai Institute of Plant Physiology and Ecology Chinese Academy of Sciences Shanghai 200032 China PlantSystems Biology Research Group Partner Institute for Computational Biology Chinese Academy of Sciences Shanghai 200031 China

Background： The increase in global population, climate change and stagnancy in crop yield on unit land area basis in recent decades urgently call for a new approach to support contemporary crop improvements, ePlant is a mathematical model of plant growth and development with a high level of mechanistic details to meet this challenge. Results： ePlant integrates modules developed for processes occurring at drastically different temporal （10-8-106 seconds） and spatial （10-10-10 meters） scales, incorporating diverse physical, biophysical and biochemical processes including gene regulation, metabolic reaction, substrate transport and diffusion, energy absorption, transfer and conversion, organ morphogenesis, plant environment interaction, etc. Individual modules are developed using a divide-and-conquer approach; modules at different temporal and spatial scales are integrated through transfer variables. We further propose a supervised learning procedure based on information geometry to combine model and data for both knowledge discovery and model ex.ension or advances. We finally discuss the recent formation of a global consortium, which includes ex.erts in plant biology, computer science, statistics, agronomy, phenomics, etc. aiming to ex.edite the development and application of ePlant or its equivalents by promoting a new model development paradigm where models are developed as a community effort instead of driven mainly by individual labs＇ effort. Conclusions： ePlant, as a major research tool to support quantitative and predictive plant science research, will play a crucial role in the future model guided crop engineering, breeding and agronomy.

关键词： systems modeling quantitative predictive homeostasis multiscale crop in silico

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Traditional Chinese herbal medicine Astragalus Radix.and its effects on intestinal absorption of aconite alkaloids in rats

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Chinese Herbal Medicines 2021年第2期13卷 235-242页

作者： x.n-li Liang Miao-miao Ji Lai Chen Ye Liao xiao-qiang Kong x.-qiang x. Zheng-gen Liao danny W.Wilson Key Laboratory of Modern Preparation of Chinese Meteria Medica Ministry of EducationJiangxi University of Traditional Chinese MedicineNanchang 330004China Laboratory of Animal Research Center for Science and Technology Jiangxi University of Traditional Chinese MedicineNanchang 210023China Shengjing Hospital of China Medical University Shenyang 110122China Research Centre for Infectious Diseases(RCID) University of AdelaideAdelaide SA5005Australia

Objective:Astragalus Radix.AR,Huangqi in Chinese) has been widely used as a qi(energy) restoring herb that is thought to act through reinvigorating the spleen and *** is used to rebalance the body temperature during illness and played an irreplaceable role in disease control since ancient times,but it is limited by its strong neuro and *** the Song Dynasty(1227),the two herbs have been commonly used as herbal pairs including in the famous Qifu Decotion,from the "Wei's Family Prescription".However,many ancient tex.s also record that they are not compatible using together,suggesting they can have negative outcomes when *** study investigated whether Astragali Radix.had either positive or negative effects on absorption of six.different active alkaloids derived from ***:Single intestinal perfusion model was used to study the effects of Astragali Radix.on aconite alkaloids *** of ABC transporters and distribution of three tight junction proteins on the surface of intestinal enothelium were assessed by Reverse Transcription-Polymerase Chain Reaction(RT-PCR),Western blot and immunofluorescence microscopy,***:The results showed that aconite alkaloids absorption could be inhibited,and different concentrations of Astragali Radix.considerably increased the ex.ression levels of the ABC transporters and tight junction proteins with Astragali Radix.***:These results suggest that Astragali Radix.can block absorption of aconite alkaloids through the upregulation ex.ression of ATP-binding cassette transporters(ABC transporters) and tight junction *** demonstrates that co-administration of Astragali Radix.with other drugs might change the absorption profile of the second drug which is important to know in clinic therapy.

关键词： ABC transporter alkaloids of aconite Astragali Radix intestinal absorption tight junction

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Synthesis of Commercial-Scale Tungsten Carbide-Cobalt (WC/Co) Nanocomposite Using Aqueous Solutions of Tungsten (W), Cobalt (Co), and Carbon (C) Precursors

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Journal of Materials Science and Chemical Engineering 2014年第7期2卷 1-15页

作者： T. danny xiao x.nglong Tan Maozhong Yi Shigao Peng Fangcai Peng Jiangao Yang Yu Dai Fujian Jinx.n Tungsten Co. Ltd. Longyan City China Hunan ACME Technology Co. Ltd ACME Technology Park Changsha China Inframat Corporation 151 Progress Drive Manchester CT USA State Key Laboratory of Powder Metallurgy Central South University Changsha China

This paper reports the chemical synthesis of tungsten carbide/cobalt (WC/Co) nanocomposite powders via a unique chemical processing technique, involving the using of all water soluble solution of W-, Co- and C-precursors. In the actual synthesis, large quantities of commercial-scale WC-Co nanocomposite powders are made by an unique combination of converting a molecularly mix.d W-, Co-, and C-containing solutions into a complex.inorganic polymeric powder precursor, conversion of the inorganic polymeric precursor powder into a W-Co-C-O containing powder intermediates using a belt furnace with temperature at about 500°C - 600°C in an inert atmosphere, followed by carburization in a rotary furnace at temperature less than 1000°C in nitrogen. Liquid phase sintering technique is used to consolidate the WC/Co nanocomposite powder into sintered bulk parts. The sintered parts have ex.ellent hardness in ex.ess of 93 HRA, with WC grains in the order of 200 - 300 nm, while Co phase is uniformly distributed on the grain boundaries of the WC nanoparticles. We also report the presence of cobalt Co precipitates inside tungsten carbide WC nanograins in the composites of the consolidated bulk parts. EDS is used to identify the presence of these precipitates and micro-micro-diffraction technique is employed to determine the nature of these precipitates.

关键词： Tungsten Carbide/Cobalt Nanocomposite Chemical Synthesis Spray Conversion Belt Furnace Rotary Furnace Water Soluble Precursors Cobalt Nanograin Precipitates

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溶液注入热等离子体中直接制备纳米结构热障涂层

溶液注入热等离子体中直接制备纳米结构热障涂层

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第五届中国功能材料及其应用学术会议

作者：蒋显亮 Nitin PADTURE Maurice GELL danny xiao 中南大学表面与涂层技术研究所 Institute of Materials Science University of Connecticut Storrs CT 06269 USA Inframat Corporation North Haven CT 06473 USA

采用一种新的方法,将Y2O3稳定的ZrO2前驱体溶液雾化注入直流等离子体中直接制备热障涂层.扫描电镜,透射电镜、x.线衍射分析、激光闪烁法分别观察分析了涂层的显微组织、纳米晶粒、相结构和热导率,排水法、冷热冲击法分别检测了涂层密... 详细信息

采用一种新的方法,将Y2O3稳定的ZrO2前驱体溶液雾化注入直流等离子体中直接制备热障涂层.扫描电镜,透射电镜、x.线衍射分析、激光闪烁法分别观察分析了涂层的显微组织、纳米晶粒、相结构和热导率,排水法、冷热冲击法分别检测了涂层密度和热循环性能.实验结果显示:等离子体喷涂液体制备出来的热障涂层不具有层状组织,晶粒尺寸小于100nm,组成相为四方相,硬度为350左右,热导率在1.2-1.5 W/m·K范围,涂层中存在16%左右的孔隙率,具有比常规微米结构热障涂层更优越的热循环性能.分析结果表明:液体注入热等离子体中的雾化沉积既区别于物理化学气相沉积,又区别于粉末注入热等离子体中的熔化沉积,属于表面工程技术下的交叉领域.

关键词：等离子体氧化锆热障涂层纳米结构热导率

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溶液注入热等离子体中直接制备纳米结构热障涂层

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功能材料 2004年第Z1期35卷 1597-1600页

作者：蒋显亮 Nitin PADTURE Maurice GELL danny xiao 中南大学表面与涂层技术研究所湖南长沙410083 Institute of Materials ScienceUniversity of ConnecticutStorrsCT 06269USA Institute of Materials ScienceUniversity of ConnecticutStorrsCT 06269USA Inframat CorporationNorth HavenCT 06473USA

采用一种新的方法,将Y2O3稳定的ZrO2前驱体溶液雾化注入直流等离子体中直接制备热障涂层.扫描电镜、透射电镜、x.线衍射分析、激光闪烁法分别观察分析了涂层的显微组织、纳米晶粒、相结构和热导率,排水法、冷热冲击法分别检测了涂层密... 详细信息

采用一种新的方法,将Y2O3稳定的ZrO2前驱体溶液雾化注入直流等离子体中直接制备热障涂层.扫描电镜、透射电镜、x.线衍射分析、激光闪烁法分别观察分析了涂层的显微组织、纳米晶粒、相结构和热导率,排水法、冷热冲击法分别检测了涂层密度和热循环性能.实验结果显示:等离子体喷涂液体制备出来的热障涂层不具有层状组织,晶粒尺寸小于100nm,组成相为四方相,硬度为350左右,热导率在1.2～1.5 W/m·K范围,涂层中存在16%左右的孔隙率,具有比常规微米结构热障涂层更优越的热循环性能.分析结果表明:液体注入热等离子体中的雾化沉积既区别于物理化学气相沉积,又区别于粉末注入热等离子体中的熔化沉积,属于表面工程技术下的交叉领域.

关键词：等离子体氧化锆热障涂层纳米结构热导率

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世界杯女子佩剑决定性动作起动和时机距离值的准定量研究

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中国体育科技 2009年第6期45卷 71-75页

作者：李晓浦洪晖张百鸣林德佳朱柏强华南理工大学体育学院广东广州510640 广东工业大学体育部广东广州510090 香港体育学院

为使佩剑研究可定量化,将技术类别划分为一单步和多单步对攻以及单纯进攻和单纯防守,通过录像解析数据对世界杯女子佩剑冠、亚、季军技术进行了定量和统计分析。结果显示,以身体重心水平速度为基准,参考录像表象分析,所确定决定性动作... 详细信息

为使佩剑研究可定量化,将技术类别划分为一单步和多单步对攻以及单纯进攻和单纯防守,通过录像解析数据对世界杯女子佩剑冠、亚、季军技术进行了定量和统计分析。结果显示,以身体重心水平速度为基准,参考录像表象分析,所确定决定性动作的起动时刻更客观有效可信,由此确定的时机距离较好地反映了运动员对进攻时机和进攻有机组合距离值的把握能力;双方的前脚间距是培养适宜时机距离感的重要指标,双方后脚间距离是诊断时机距离准确可靠的单选指标;对攻时,相对对手略微晚起动和缩小时机距离是女子佩剑优秀运动员的原则性特征技术。

关键词：佩剑决定性动作开始时刻时机距离速度

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被诅咒的尼罗鳄

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小哥白尼（野生动物） 2017年第9期 38-41页

作者：千堆雪 danny Govender

小恶魔奥纳死了。毫无道理地死了。8月的这个下午，南非克鲁格国家公园内。鳄鱼峡谷的草食动物们聚集在金合欢树下，七嘴八舌地议论着。小恶魔奥纳是峡谷里最可怕的一条尼罗鳄，年轻体壮，谁都以为它会长寿，欺负大家100年，如今，突然... 详细信息

小恶魔奥纳死了。毫无道理地死了。8月的这个下午，南非克鲁格国家公园内。鳄鱼峡谷的草食动物们聚集在金合欢树下，七嘴八舌地议论着。小恶魔奥纳是峡谷里最可怕的一条尼罗鳄，年轻体壮，谁都以为它会长寿，欺负大家100年，如今，突然就死了。

关键词：鳄鱼尼罗国家公园草食动物合欢树峡谷

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