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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第7期8卷 1110-1117页

作者： GAO xiao-juan WANG Jin-chang ZHU Xiang-rong College of Civil Engineering and Architecture Zhejiang University Hangzhou 310027 China Institute of Architecture Engineering Henan University of Science and Technology Luoyang 471003 China Ningbo Institute of Technology Zhejiang University Ningbo 315005 China

As a special geological phenomenon, the character of collapsible loess foundation is collapsible when penetrated by water. This character leads to the soil losing load bearing capacity largely and may lead to foundation failure. Pile is a popular foundation used in collapsible loess. The squeezed branch and plate pile is a new type of pile developed in recent years and has not be used in a project before. In this paper three squeezed branch and plate piles are tested in collapsible loess after immersion processing. The results may be used for reference in similar construction project, and to provide theoretical references for de- signing of the squeezed branch and plate piles in engineering practice.

关键词： Collapsible loess foundation Squeezed branch and plate pile Immersion processing Full-scale static load test

Molecular Characterization and Expression Analysis of TaZFP15, a C_2H_2-Type Zinc Finger Transcription Factor Gene in Wheat (Triticum aestivum L.)

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Journal of Integrative Agriculture 2012年第1期11卷 31-42页

作者： SUN Zhao-hua DING chang-huan LI xiao-juan xiao Kai College of Life Science Agricultural University ofHebei Baoding 071001 P.R.China College of Agronomy Agrieultural University of Hebei Baoding 071001 P.R. China

Based on sequencing of part clones in a root subtractive cDNA library, an expressed sequence tag （EST） sharing high similarity to a rice C2H2 zinc finger transcription factor （ZFP15） was obtained in wheat. Through bioinformatics approach, the wheat C2H2-type ZFP gene referred to TaZFP15 has been identified and characterized. As a full-length cDNA of 670 bp, TaZFP15 has an open reading frame of 408 bp and encodes a 135-aa polypeptide. TaZFP15 contains two C2H2 zinc finger domains and each one has a conserved motif QALGGH. The typical L-box, generally identified in the C2H2 type transcription factors, has also been found in TaZFP15. Phylogenetic analysis suggested that TaZFP15 shares high similarities with rice ZFP15 （GenBank accession no. AY286473）, maize ZFP （GenBank accession no. NM_001159094） and a subset of other zinc-finger transcription factor genes in plant species. The expression of TaZFP15 was up-regulated by starved-Pi stress, showing a pattern to be gradually elevated along with the progression of the Pi-stress in a 23-h treatment regime. Similarly, the transcripts of TaZFP15 in roots were also induced by nitrogen deficiency, and abiotic stresses of drought and salinity. No responses of TaZFP15 were detected in roots to nutrition deficiencies of P, Zn, and Ca, and the external treatment of abscisic acid （ABA）. TaZFP15 could be specifically amplified in genome A, B, and D, and without variability in the sequences, suggesting that TaZFP15 has multi-copies in the homologous hexaploid species. Transgenic analysis in tobacco revealed that up-regulation of TaZFP15 could significantly improve plant dry mass accumulation via increasing the plant phosphorus acquisition capacity under Pi-deficiency condition. The results suggested that TaZFP15 is involved in mediation of signal transductions of diverse external stresses.

关键词： Triticum aestivum L. zinc-finger transcription factor gene nutrition deficiency abiotic stress expression pattern

Effect of electromagnetic stirring on metallurgical quality of GCr15 electroslag ingot

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China Foundry 2022年第1期19卷 46-54页

作者： xiao-fang Shi Tao Xu Li-zhong chang School of Metallurgy Engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina Anhui Fukai Special Material Co. Ltd.Jixi 245300AnhuiChina

To further improve the metallurgical quality of electroslag remelting,remove the large inclusions in electroslag ingot and refine the solidification structure of electroslag ingot,an electroslag remelting furnace with electromagnetic stirring was designed,and the influence of different magnetic induction intensities on metallurgical quality of GCr15 electroslag ingot was *** with different sizes and types were analyzed by an ASPEX scanning electron microscope,and the morphology and composition of inclusions were further observed by a JSM-6510LV scanning electron *** distribution of alloying elements on the cross section of electroslag ingot was analyzed by original position analysis(OPA).The results show that whether or not electromagnetic stirring is used,the inclusions in electroslag ingot are mainly composed of Al_(2)O_(3),MnS,MnS-oxide and other oxides,among which Al_(2)O_(3) is the *** with an electroslag ingot without electromagnetic stirring,the number of inclusions decreases considerably,and the proportion of small inclusions increases while the proportion of large inclusions decreases when the electromagnetic stirring with remelting current of 1.1 kA and magnetic induction intensity of 62 Gs is ***,excessive electromagnetic force will cause the number and diameter of inclusions to increase *** stirring has different effects on the segregation of different *** the experimental conditions,the weak electromagnetic force with 1.1 kA and magnetic induction intensity of 108 Gs has little effect on the segregation of C,but decreases the segregation of P,and the excessive electromagnetic force aggravates the segregation of alloy elements.

关键词： electroslag remelting electromagnetic stirring inclusion solidification segregation GCr15 bearing steel

Analysis of tritium production in a 2 MW liquid-fueled molten salt experimental reactor and its environmental impact

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Nuclear Science and Techniques 2016年第4期27卷 7-13页

作者： xiao-Wen Lyu xiao-BinXia Zhi-Hong Zhang Jun Cai chang-Qi Chen Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049China

Tritium release is one of the most concerning topics in nuclear power plants. Here, the tritium production in a 2 MW liquid-fueled molten salt experimental reactor(TMSR-LF1) was calculated by ORIGEN-S with an updated cross-section library generated by TRITON in SCALE 6.1.3 code system. The results show that the tritium production rate and normalized tritium production rate of TMSR-LF1 are 8.90x10^(11)Bq/day and4.45x10^(11)Bq/(MW day), respectively. The environmental impact of tritium was analyzed via PC-CREAM 08 with an assumed 36 % release rate of tritium referring to the molten salt reactor experiment. During normal operations, the maximum tritium concentration is 1.4 Bq/m^3 under normal condition, and the corresponding individual dose to the public is about 1 μSv/a; under extreme conditions, the maximum concentration and corresponding individual doses are 11.8 Bq/m^3 and 9 μSv/a, *** is the main exposure pathway and accounts for62 % of the total dose. Of this, 35 % is from organically bound tritium.

关键词：氚浓度生产分析液体燃料环境影响熔盐实验堆实验反应堆 Triton

Effect of mold rotation on the bifilar electroslag remelting process

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International Journal of Minerals,Metallurgy and Materials 2015年第10期22卷 1033-1042页

作者： xiao-fang Shi Li-zhong chang Jian-jun Wang School of Metallurgy Engineering Anhui University of Technology

A novel electroslag furnace with a rotating mold was fabricated, and the effects of mold rotational speed on the electroslag remelting process were investigated. The results showed that the chemical element distribution in ingots became uniform and that their compact density increased when the mold rotational speed was increased from 0 to 28 r/min. These results were attributed to a reasonable mold speed, which resulted in a uniform temperature in the slag pool and scattered the metal droplets randomly in the metal pool. However, an excessive rotational speed caused deterioration of the solidification structure. When the mold rotational speeds was increased from 0 to 28 r/min, the size of Al2O3 inclusions in the electroslag ingot decreased from 4.4 to 1.9 μm. But the excessive mold rotational speed would decrease the ability of the electroslag remelting to remove the inclusions. The remelting speed gradually increased, which resulted in reduced power consumption with increasing mold rotational speed. This effect was attributed to accelerated heat exchange between the consumable electrode and the molten slag, which resulted from mold rotation. Nevertheless, when the rotational speed reached 28 r/min, the remelting speed did not change because of limitations of metal heat conduction. Mold rotation also improved the surface quality of the ingots by promoting a uniform temperature distribution in the slag pool.

关键词： electroslag remelting inclusions solidification mo

Effect of thermal deformation parameters on the microstructure, texture, and microhardness of 5754 aluminum alloy

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International Journal of Minerals,Metallurgy and Materials 2019年第9期26卷 1140-1150页

作者： chang-qing Huang Jia-xing Liu xiao-dong Jia School of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China State Key Laboratory of High-performance Complicated Manufacturing Central South UniversityChangsha 410083China Light Alloys Research Institute Central South UniversityChangsha 410083China

The evolution of the microstructure, texture, and microhardness of 5754 aluminum alloy subjected to high-temperature plastic deformation under different deformation conditions was studied on the basis of thermal simulations and electron-backscattered diffraction and Vickers microhardness experiments. The results of a misorientation angle study show that an increase in the deformation temperature and strain rate promoted the transformation of low-angle grain boundaries to high-angle grain boundaries, which contributed to dynamic recrystallization. The effect of the deformation parameters on the texture and its evolution during the recrystallization process was explored on the basis of the orientation distribution function. The results demonstrate that the deformed samples mainly exhibited the features of type A, B, and B textures. The formation and growth of the recrystallized grains clearly affected the texture evolution. The microhardness results show that the variation of the microhardness was closely related to the temperature, strain rate, and dynamic recrystallization.

关键词： microstructure texture misorientation dynamic recrystallization microhardness

Preparation of high-rate anode materials based on porous highly conductive carbon coating and SiOx disproportionation reaction

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Progress in Natural Science:Materials International 2024年第4期34卷 739-746页

作者： Haihui Liu Qiang Xu xiao Zhang Shuliang Lv chang Ma State Key Laboratory of Separation Membranes and Membrane Processes Tianjin Key Laboratory of Advanced Fibers and Energy Storage School of Materials Science and Engineering Tiangong University

Silicon monoxide（SiOx） has garnered considerable attention as an anode material owing to its high ***, its commercial viability is hampered by the low conductivity and inadequate cycling stability. In this study, a micrometer-scale silicon oxide/carbon composite（1000-SiOx/NC） was developed based on the porous and high electrical conductivity of pyrolyzed polydopamine（PDA） and the high-temperature disproportionation of SiOx. Electrochemical impedance spectroscopy（EIS） and X-ray photoelectron spectroscopy（XPS）analyses confirmed that the pyrolysis of polydopamine（PDA） not only improves electrode conductivity but also contributes to the formation of a stable solid electrolyte interface（SEI）. Additionally, SiOxundergoes disproportionation reactions during the pyrolysis of PDA, further the improves the cyclic stability of the ***, the 1000-SiOx/NC composite electrode exhibited an impressive specific capacity of 783.4 mAh·g-1after 500 cycles at 1 A g-1, maintaining 80.1 % of its initial capacity. Additionally, at a high rate of 3 C, its capacity reached 607.3 mAh·g-1The synthesis approach is both straightforward and economical, offering a fresh avenue for the widespread commercial deployment of SiOx.

关键词： 1000-SiOx/NC anode Lithium-ion batteries Nitrogen doping Porous structure

Analysis of air quality characteristics of Beijing–Tianjin–Hebei and its surrounding air pollution transport channel cities in China

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Journal of Environmental Sciences 2020年第1期32卷 213-227页

作者： Cuicui xiao Miao chang Peikun Guo Meifeng Gu Yang Li School of Environment Tsinghua University

Beijing–Tianjin–Hebei(BTH)and its surrounding areas are very important to air pollution control in *** analyze the characteristics of BTH and its surrounding areas of China,we collected 5,641,440 air quality data from 161 air monitoring stations and 37,123,000 continuous monitoring data from air polluting enterprises in BTH and surrounding cities to establish an indicator system for urban air quality *** results showed that particulate matter with aerodynamic diameters ofchanges in air quality revealed that peaks of PM2.5,PM10 and NO2 appeared from 8:00 to 10:00,while those for O3 appeared at 15:00–16:*** exposure characteristics of the 31 cities showed that six districts in Beijing had the highest air quality population exposure,and that exposure levels in Zhengzhou,Puyang,Anyang,Jincheng were higher than the average of the 31 investigated ***,multiple linear regression revealed a negative correlation between meteorological factors(especially wind and precipitation)and air quality,while a positive correlation existed between industrial pollution emissions and air quality in most of BTH and its surrounding cities.

关键词： Beijing–Tianjin–Hebei Air quality population exposure Seasonal index Hourly change Industrial pollution source emission Meteorology factors

Real-time visual tracking using complementary kernel support correlation filters

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Frontiers of Computer Science 2020年第2期14卷 417-429页

作者： Zhenyang SU Jing LI Jun chang Bo DU Yafu xiao School of Computer Science Wuhan UniversityWuhan 430072China Department of Digital Media Technology Huanggang Normal UniversityHuangzhou 438000China

Despite demonstrated success of SVM based trackers,their performance remains a boosting room if carefully considering the following factors:first,the tradeoff between sampling and budgeting samples affects tracking accuracy and efficiency much;second,how to effectively fuse different types of features to learn a robust target representation plays a key role in tracking *** this paper,we propose a novel SVM based tracking method that handles the first factor with the help of the circulant structures of the samples and the second one by a multi-kernel learning ***,we formulate an SVM classification model for visual tracking that incorporates two types of kernels whose matrices are circulant,fully taking advantage of the complementary traits of the color and HOG features to learn a robust target ***,it is fortunate that the SVM model has a closed-form solution in terms of both the classifier weights and the kernel weights,and both can be efficiently computed via fast Fourier transforms(FFTs).Extensive evaluations on OTB100 and VOT2016 visual tracking benchmarks demonstrate that the proposed method achieves a favorable performance against various state-of-the-art trackers with a speed of 50 fps on a single CPU.

关键词： visual tracking SVM correlation filter multikernel learning

Bionic Design to Reduce Jacking Force for Trenchless Installations in Clay Soil

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Journal of Bionic Engineering 2020年第4期17卷 686-694页

作者： Donghui Chen xiao Yang Taidong Dai Youhong Sun Zhiyong chang College of Biological and Agricultural Engineering Jilin UniversityChangchun 130022China Key Laboratory of Bionic Engineering Ministry of EducationChangchun 130022China School of Engineering and Technology China University of GeosciencesBeijing 100083China National-Local Joint Engineering Laboratory of In-situ Conversion Drilling and Exploitation Technology for Oil ShaleChangchun 130021China

The application of trenchless technology is the trend of underground public facilities'installation,replacement and *** the soil-engaging component during penetrating bore,the working resistance of penetration head has remarkable effect on energy consumption of the whole working *** typical soil-digging animals,like pangolin and earthworm,they own special micro structures on their *** has been widely proved that some micro geometrical structures can effectively reduce adhesion *** kinds of bionic penetration heads were designed by imitating micro geometrical structures inspired by the soil *** this work,the real time jacking forces of the bionic penetration heads were measured and compared with a smooth penetration head(control group)without micro geometrical *** result indicated that the jacking forces of the bionic penetration heads were smaller than that of the smooth penetration *** proved that the bionic penetration heads have the ability of reducing adhesion *** vertical concave penetration head got the smallest jacking force,of which the average jacking force was 18.7%lower than that of the smooth penetration *** interaction between soil and bionic surface of penetration head was discussed on the condition of wet *** bionic surface reduced the adhesion resistance by disturbing the soil and braking the continuous water film between soil and the surface of the penetration head.

关键词： trenchless technology soil bionic adhesion reduction water film wet friction