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Dynamic response of a Q&P steel to high-strain-rate tension

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Acta Mechanica Solida Sinica 2017年第5期30卷 484-492页

作者： Huanran Wang Wenchao Zhang dongfang ma Bohan ma Danian Chen Xin Yang Chunlei Fan Mechanics and materials Science Research Center Ningbo UniversityNingboZhejiang 315211China China Science Lab Research&Development CenterGeneral Motors CompanyShanghai 202106China

The experimental study on the volume fraction of retained austenite for QP980CR steel under high-strain-rate tension is briefly described. An interrupted tensile split Hopkinson bar （TSHB） is developed to control the elongation of specimens. The QP980CR steel sam- ples recovered from the interrupted TSt-IB tests are investigated using synchrotron X-ray diffraction （XRD） to analyze the effects of strain and strain rate on the martensitic trans- formation of retained austenite. A constitutive model of QP980CR steel coupling with the transformation-induced plasticity （TRIP） effect is presented based on Delannay＇s mean-field modeling. The stress-strain curves of quasi-static and dynamic tensile tests for QP980CR steel are compared with the results predicted by the presented constitutive model. The dif- fuse necking of QP980CR steel sheet specimens in TSHB tests is analyzed using Batra and Vv＇ei＇s instability criterion and the presented constitutive model. The effects of strain rate and temperature on the dynamic tensile fracture strain of QP980CR steel are also given.

关键词： Interrupted Hopkinson testPhase transformationMultiphase constitutive modelDynamic fractureQP980CR steel

Modeling and analysis of car-following behavior considering backward-looking effect

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Chinese Physics B 2021年第3期30卷 326-334页

作者： dongfang ma Yueyi Han Fengzhong Qu Sheng Jin Ocean College Institute of Marine Information Science and TechnologyZhejiang UniversityHangzhou 310058China College of Civil Engineering and Architecture Institute of Intelligent Transportation SystemZhejiang UniversityHangzhou 310058China

The car-following behavior can be influenced by its driver’s backward-looking *** in traffic congestion,if vehicles adjust the headway by considering backward-looking effect,the stability of traffic flow can be enhanced.A model of car-following behavior considering backward-looking effect was built using visual information as a *** critical stability conditions were derived by linear and nonlinear stability *** results of parameter sensitivity analysis indicate that the stability of traffic flow was enhanced by considering the backward-looking *** spatiotemporal evolution of traffic flow of different truck ratios and varying degrees of backward-looking effect was determined by numerical *** study lays a foundation for exploring the complex feature of car-following behavior and making the intelligent network vehicles control rules more consistent with human driver habits.

关键词： traffic flow car-following model visual angle backward-looking effect

Preparation and hydrogen gas sensitive characteristics of highly ordered titania nanotube arrays

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Chinese Science Bulletin 2008年第9期53卷 1352-1357页

作者： JI HuiMing LU HuiXiang ma dongfang YU JianJun ma ShiCai Key Laboratory of Advanced Ceramics and machining Technology of Ministry of Education School of Materials of Tianjin UniversityTianjin 300072 China

In this paper, we report the growth and characteristics of titania nanotube arrays prepared by anodic oxidation and then annealed in an oxygen atmosphere at 500℃. The titania nanotube arrays presented high sensitivity to hydrogen gas. The crystalline phase of the samples was checked by X-ray diffraction (XRD). The differences in the nanotubes morphology attributed to the etched samples due to anodiza- tion potential, reaction time and the electrolyte concentration were analyzed by scanning electron mi- croscopy (SEM). The gas sensitive parameters of the samples were obtained from resistance, the re- sponse time and the recovery time at different temperatures.

关键词：二氧化钛纳米管数组氢气敏感器

magmatic Evolution and Mineralization of Porphyry Copper-Gold Deposits in the Duolong Ore Concentration Area, Tibet

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Acta Geologica Sinica(English Edition) 2015年第5期89卷 1767-1768页

作者： ZHANG Hai ma dongfang ZHANG Hong ZHU Xiangping Chengdu Institute of Geology and Mineral Resources

The Bangong Lake-Nujiang River metallogenic belt is located between the Qiangtang Block and Lhasa Block, and the Duolong ore concentration area is located in the western section of the Bangong Lake-Nujiang River metallogenic belt. Till now, several large and super large copper-gold deposits, such as Duobuza, Bolong, Dibaonamugang, Naruo and Rongna deposits have been discovered in this area, mainly porphyry copper-gold ones.

关键词： area Lake magmatic Evolution and Mineralization of Porphyry Copper-Gold Deposits in the Duolong Ore Concentration Area Tibet

Genome-wide Analysis of a Plant AT-rich Sequence and Zinc-binding Protein (PLATZ) in Triticum Aestivum

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Phyton-International Journal of Experimental Botany 2021年第3期90卷 971-986页

作者： Xiaohang He Minjie Liu Zhengwu Fang dongfang ma Yilin Zhou Junliang Yin Engineering Research Center of Ecology and Agricultural Use of Wetland Ministry of EducationHubei Collaborative Innovation Center for Grain IndustryCollege of AgricultureYangtze UniversityJingzhou434025China Shanxi Key Laboratory of Integrated Pest management in Agriculture Institute of Plant ProtectionTaiyuan030031China State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing100193China

Plant AT-rich sequence and zinc-binding protein(PLATZ)is a plant transcription factor that has been studied in *** can non-specifically bind to sequences rich in A/T bases to induce transcriptional *** is involved in the regulation of dehydration tolerance in *** this study,we performed bioinformatics analysis to identify and characterize wheat PLATZ(TaPLATZ)*** identified 49 wheat PLATZ genes by searching the wheat genome by using known PLATZ gene sequences from rice,Arabidopsis,and *** analysis on PLATZ gene sequences from different species was *** found that PLATZs could be divided into three *** chromosome(chr)distribution analysis revealed that the 49 identified wheat PLATZ genes are distributed in 15 *** structure and motif analyses indicated that most PLATZ genes possess conserved exon/intron arrangements and motif *** analysis of transcriptional data indicated that several wheat PLATZ genes may play an important role in abiotic stress resistance given that they are expressed under salt *** results of qRT-PCR further confirmed that TaPLATZ is involved in plant abiotic stress and is also related to the cell differentiation of plant *** results lay the foundation for further studies on the function of the wheat PLATZ gene family.

关键词： Transcription factor PLATZ abiotic stress gene expression

Petrogenesis of an Early Cretaceous Xiabie Co I-type Granite in Southern Qiangtang,Tibet:Evidence from Geochemistry,Geochronology,Rb-Sr,Sm-Nd,Lu-Hf and Pb isotopes

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Acta Geologica Sinica(English Edition) 2022年第3期96卷 919-937页

作者： LIU Hong LI Youguo LI Wenchang LI Guangming HUANG Hanxiao ma dongfang HUANG Yong ZHOU Qing FU Jiangang College of Earth Sciences Chengdu University of TechnologyChengdu 610059China Chengdu Center China Geological SurveyChengdu 610081China College of Land and Resources Engineering Kunming University of Science and TechnologyKunming 650093China Applied Geology Research Center China Geological SurveyChengdu 610036China

Cretaceous magmatism is widely distributed on both sides of the Bangong-Nujiang suture zone(BNSZ).These rocks record the subduction to closure history of the Bangong-Nujiang Tethys Ocean(BNO)and the collisional history between the Lhasa(LS)and Qiangtang(QT)*** Xiabie Co granite in Nyima County,which located on the southern margin of the QT terrane,*** this study,whole-rock geochemistry;Rb-Sr,Sm-Nd,and Pb isotopes;and laser ablation inductively coupled mass spectrometry(LA-ICP-MS)zircon U-Pb ages and Lu-Hf isotopes of the Xiabie Co granite in the Nyima area have been studied to constrain its petrogenesis and tectonic *** study can help explain the tectonic evolution of the BNSZ and crust-mantle *** U-Pb dating indicates that the granite was emplaced at ca.120 *** granite contains a small amount of hornblende and has high silicon(SiO2=73.97-78.03 wt%),potassium(K_(2)O=4.75-6.53 wt%),and total alkali(K_(2)O+Na_(2)O=7.98-8.98 wt%)contents;low calcium content(CaO=2.33-4.11 wt%);and variable A/CNK(1.00-1.18)and A/NK(1.09-1.22)*** P_(2)O_(5) content of the granite negatively correlated with the SiO_(2)***,the Xiabie Co granite is a weakly peraluminous I-type granite belonging to the high-K calcalkaline to Shoshone *** is enriched in light rare earth elements(LREEs)and relatively depleted in heavy rare earth elements(HREEs),with LREE/HREE ratios of 8.03-16.40 and La_(N)/Yb_(N) ratios of *** show right-leaning chondrite-normalized rare earth element patterns with pronounced negative Eu anomalies(Eu/Eu*=0.67-0.76).The primitive-mantle-normalized trace element spider diagrams of the samples are right-leaning zigzag curves,showing relative enrichment in large-ion lithophile elements(LILEs,e.g.,Rb,Th,U,and K)and depletion in high-field-strength elements(HFSEs,e.g.,Nb,P,Ti,and Yb)and displaying striking Sr and Ba negative *** graniteεHf(t)values were positive(2.9-9.9),whereas the whole-rockεNd(t

关键词： I-type granite Lhasa-Qiangtang collision Bangong-Nujiang Tibet(Xizang)

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直线型公交停靠站通行能力计算方法

西南交通大学学报 2013年第3期48卷 546-552页

作者：孙锋王殿海马东方吉林大学交通学院吉林长春130012 山东理工大学交通学院山东淄博255049 浙江大学建筑工程学院浙江杭州310058

为了提高公交停靠站通行能力计算方法的精确性,针对目前城市的公交运行现状,使用时空分布图分析了公交车在直线式停靠站的服务过程,在此基础上,综合考虑停靠站排队概率和停靠时间分布,推导了公交停靠站通行能力计算模型.对杭州市公交车... 详细信息

为了提高公交停靠站通行能力计算方法的精确性,针对目前城市的公交运行现状,使用时空分布图分析了公交车在直线式停靠站的服务过程,在此基础上,综合考虑停靠站排队概率和停靠时间分布,推导了公交停靠站通行能力计算模型.对杭州市公交车停靠时间的分布函数进行了拟合,对数正态分布的拟合程度最优,2个交通时段的K-S检验值分别为0.083 9和0.050 6.用maTLAB编程得到不同分布参数下的通行能力结果表明:随着停靠时间对数平均值μ的增加,不同泊位数停靠站的通行能力减少了44.4%～47.3%;通过VISSIM仿真得到了停靠站的通行能力,模型计算值与仿真结果的平均误差为6.5%.

关键词：直线式公交停靠站通行能力停靠时间对数正态分布

Isolation of Antagonistic Bacteria against Fusarium graminearum and Its Antagonistic Activity

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Plant Diseases and Pests 2016年第5期7卷 13-15,20页

作者： Sun Cai Zhang Peng Huang Shi Li Hongyan ma dongfang Zhang Changqing Hubei Collaborative Innovation Center for Grain Industry/Yangtze University Jingzhou 434025 China

[ Objective] To develop biological control resources of endophytic bacteria in wheat, the bacteria with antagonistic effect against Fusarium graminearum were screened and their antagonistic activity was studied. [ Method] The endophytic bacteria of wheat with antagonistic effect were screened using plate confrontation method; the antagonistic bacteria were identified through physiological and biochemical characteristics and 16S rDNA sequence analysis; the antagonistic spectrum of antagonistic bacteria was studied using plate confrontation method. [ Result] The antagonistic bacterium XY-3 was isolated from wheat leaves, and was identified as Bacillus amyloliquefaciens according to the physiological and biochemical characteristics and 16S rDNA sequence analysis. [ Conclusion] XY-3 had antagonistic effect against four kinds of common pathogenic fungi, presenting broad spectrum antagonistic activity against plant pathogenic fungi.

关键词： Fusarium head blight(FHB) Antagonistic bacteria Endophytic bacteria Bacillus amyloliquefaciens

Inhibitory Effects of Phenamacril, Tebuconazole and Their Mixtures on Fusarium graminearum in Wheat

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Plant Diseases and Pests 2018年第3期9卷 14-17页

作者： Lei Cuiyu Yin Junliang Fang Zhengwu Wang Shuping Zhang Xing ma dongfang Engineering Research Center of Ecology and Agricultural Use of Wetland the Ministry of Education/College of Agriculture Yangtze University Institute of Plant Protection Jiangsu Academy of Agricultural Sciences

Fusarium head blight caused by Fusarium graminearum is one of the most serious diseases in wheat production worldwide, which seriously affects the yield and quality of wheat. Wheat grains carrying the pathogen are poisonous to human and livestock health. With the long-term use of single chemical pesticide, the drug-resistance of F. graminearum is increasing day by day, and mixed agent is one of the effective strategies to improve the efficacy and delay the resistance. The mycelial growth rate method was used to determine the inhibition rates of phenamacril, tebuconazole and their mixtures(1∶1, 1∶3, 1∶5, 1∶7, 3∶1, 5∶1 and 7∶1). The synergistic coefficient(SR) was calculated by Wadley method, and the combined action types of the two agents were evaluated. The results showed that the ECof tebuconazole was 0.418 28 mg/L, and that of phenamacril was 0.489 8 mg/L; the optimum mixture ratio of phenamacril and tebuconazole was 1 ∶1, with the ECvalue of 0.053 74 and the synergistic coefficient of 4.2696, and the control effect of mixed agent was significantly better than that of single agent. It is feasible to control Fusarium head blight by mixing phenamacril and tebuconazole, providing a theoretical basis for development of new compound agents and effective control of Fusarium head blight.

关键词： Phenamacril Tebuconazole Fusarium head blight Resistance