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  • 1
    Language: English
    In: Materials Science & Engineering A, 2011, Vol.528(29), pp.8353-8358
    Description: ► This paper adopted SPS process to prepare the Ti-coated CFs/W–20Cu composites. ► With small amount of Ti-coated CFs, composites without impurities were obtained. ► 1.0 wt.% Ti-coated CFs were homogeneously dispersed in the W–20Cu alloy. ► TRS and TC of the composites were enhanced 33% and 36%, respectively. Carbon fibers were coated with titanium by vacuum slow vapor deposition. W–20Cu composite powder was prepared by spray drying and calcining-continuous reduction technology. Titanium coated carbon fibers and W–20Cu composite powder were mixed by ball-milling in ethanol solution. This paper adopted spark plasma sintering process to prepare titanium coated carbon fibers/W–20Cu composites. Effects of doping amounts of titanium coated carbon fibers on the phases, microstructure and properties of the composites were investigated. Titanium coated carbon fibers/W–20Cu composites with improved mechanical properties and thermal conductivity were fabricated. Transverse rupture strength and thermal conductivity of the 1.0 wt.% titanium-coated carbon fibers/W–20Cu composites, compared with the monolithic W–20Cu alloy, were enhanced 33% and 36%, respectively. With small doping amount of titanium-coated carbon fibers, the composites without WC, W C and graphite phases were obtained.
    Keywords: Electron Microscopy ; Mechanical Characterization ; X-Ray Diffraction ; Composites ; Powder Metallurgy ; Engineering
    ISSN: 0921-5093
    E-ISSN: 1873-4936
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  • 2
    Language: English
    In: Proceedings of the National Academy of Sciences of the United States of America, 22 February 2011, Vol.108(8), pp.3436-41
    Description: In living organisms sugars not only provide energy and carbon skeletons but also act as evolutionarily conserved signaling molecules. The three major soluble sugars in plants are sucrose, glucose, and fructose. Information on plant glucose and sucrose signaling is available, but to date no fructose-specific signaling pathway has been reported. In this study, sugar repression of seedling development was used to study fructose sensitivity in the Landsberg erecta (Ler)/Cape Verde Islands (Cvi) recombinant inbred line population, and eight fructose-sensing quantitative trait loci (QTLs) (FSQ1-8) were mapped. Among them, FSQ6 was confirmed to be a fructose-specific QTL by analyzing near-isogenic lines in which Cvi genomic fragments were introgressed in the Ler background. These results indicate the existence of a fructose-specific signaling pathway in Arabidopsis. Further analysis demonstrated that the FSQ6-associated fructose-signaling pathway functions independently of the hexokinase1 (HXK1) glucose sensor. Remarkably, fructose-specific FSQ6 downstream signaling interacts with abscisic acid (ABA)- and ethylene-signaling pathways, similar to HXK1-dependent glucose signaling. The Cvi allele of FSQ6 acts as a suppressor of fructose signaling. The FSQ6 gene was identified using map-based cloning approach, and FSQ6 was shown to encode the transcription factor gene Arabidopsis NAC (petunia No apical meristem and Arabidopsis transcription activation factor 1, 2 and Cup-shaped cotyledon 2) domain containing protein 89 (ANAC089). The Cvi allele of FSQ6/ANAC089 is a gain-of-function allele caused by a premature stop in the third exon of the gene. The truncated Cvi FSQ6/ANAC089 protein lacks a membrane association domain that is present in ANAC089 proteins from other Arabidopsis accessions. As a result, Cvi FSQ6/ANAC089 is constitutively active as a transcription factor in the nucleus.
    Keywords: Signal Transduction ; Arabidopsis -- Metabolism ; Arabidopsis Proteins -- Physiology ; Fructose -- Metabolism ; Transcription Factors -- Physiology
    ISSN: 00278424
    E-ISSN: 1091-6490
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  • 3
    Language: English
    In: Chinese Geographical Science, Feb, 2011, Vol.21(1), p.48(9)
    Description: Byline: Xiaoliang Shi (1,2), Ying Li (1), Rongxin Deng (1,2) Keywords: farmland shelterbelt; spatial heterogeneity; Spot 5; distance coefficient Abstract: On the basis of landscape ecology, combining the Spot 5 high resolution satellite imagery with GIS, a method evaluating the spatial heterogeneity of shelterbelts distribution at landscape scale is put forward in this paper. The distance coefficients of reasonable and existing landscape indexes of farmland shelterbelt networks were computed, and then through the classification of the distance coefficients, and the establishment of evaluation rules, the spatial heterogeneity of farmland shelterbelts was evaluated. The method can improve the evaluating system of previous studies on shelterbelts distribution, resolve the disadvantages of lacking spatiality of overall evaluation, and make the evaluation results have more directive significance for shelterbelt management. Based on this method, spatial heterogeneity of shelterbelt networks was evaluated in the midwest of Jilin Province, China. The results show that the regions with fewer shelterbelts and no closed network account for 34.7% of the total area, but only 4.9% of the area has relative reasonable pattern of shelterbelt networks. Many problems exist in the distribution pattern of shelterbelts, therefore, much attention should be paid to construct farmland shelterbelts in the study area. Author Affiliation: (1) Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130012, China (2) Graduated University of Chinese Academy of Sciences, Beijing, 100049, China Article History: Registration Date: 10/01/2011 Received Date: 31/03/2010 Accepted Date: 19/08/2010 Online Date: 13/01/2011 Article note: Foundation item: Under the auspices of Knowledge Innovation Programs of Chinese Academy of Sciences (No. KZCX1-YW-08-02)
    Keywords: Remote Sensing -- Case Studies ; Remote Sensing -- Analysis ; Remote Sensing -- Methods
    ISSN: 1002-0063
    Source: Cengage Learning, Inc.
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  • 4
    Language: English
    In: Inorganic chemistry, 03 September 2012, Vol.51(17), pp.9226-31
    Description: A fluorescent sensor, N-(quinolin-8-yl)-2-(quinolin-8-yloxy)acetamide (HL), based on 8-aminoquinoline and 8-hydroxyquinoline platforms has been synthesized. This sensor displays high selectivity and sensitive fluorescence enhancement to Cd(2+) in ethanol. Moreover, sensor HL can distinguish Cd(2+) from Zn(2+) via two different sensing mechanisms (photoinduced electron transfer for Cd(2+); internal charge transfer for Zn(2+)). The composition of the complex Cd(2+)/HL or Zn(2+)/L(-) has been found to be 1:1, based on the fluorescence/absorption titration and further confirmed by X-ray crystallography.
    Keywords: Cadmium -- Chemical Properties ; Cadmium -- Structure ; Electron Transport -- Methods ; X-ray Crystallography -- Usage ; Zinc Compounds -- Chemical Properties ; Zinc Compounds -- Structure;
    ISSN: 00201669
    E-ISSN: 1520-510X
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  • 5
    Language: English
    In: Materials and Design, March, 2013, Vol.45, p.365(12)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.matdes.2012.08.069 Byline: Xiaoliang Shi (a)(b), Mang Wang (a), Zengshi Xu (a), Wenzheng Zhai (b), Qiaoxin Zhang (a)(b) Keywords: Spark plasma sintering; Friction; Wear Abstract: . Display Omitted Author Affiliation: (a) School of Mechanical and Electronic Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China (b) School of Materials Science and Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China Article History: Received 16 July 2012; Accepted 25 August 2012
    Keywords: Tribology ; Sintering ; Silicon Carbides ; Composite Materials Industry
    ISSN: 0261-3069
    Source: Cengage Learning, Inc.
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  • 6
    Language: English
    In: Materials Chemistry and Physics, 15 August 2012, Vol.135(2-3), pp.818-825
    Description: F–N–W-codoped TiO nanoparticles were successfully prepared by a sol–gel-mixing method without hydrothermal or calcining treatment. Effects of the F, N and W ion dosage concentration on crystallinity, morphology, grain size and chemical status of TiO were investigated. The results showed that the appearance of F–N–W-codoped TiO powders was uniformly spheroidal nanoparticles, whose average particle size was about 7 nm. The F–N–W-codoped TiO nanoparticles owned high catalytic activity under visible light irradiation and low-temperature thermo-oxidation activity in the dark. The highest degradation rate of Rhodamine B dye was obtained by TiO powders modified with 0.5 at.% W (N/W = 6/7) and 4.0 at.% F. Even in the dark, the degradation rate increased with the increasing of temperature. It was as high as 92% when the mixing liquid was kept at 60 °C for 2 h. The high catalytic activity of the F–N–W-codoped TiO might result from larger specific surface area and high surface acidity because of surface F ions, the band gap narrowing caused by W Ti O or O–Ti–N, as well as lower recombination rate of charge carriers because of valence variation of W ions (W  → W ) in the forbidden band. ► F–N–W-codoped TiO NPs were synthesized by a simple sol–gel-mixing method. ► The NPs showed high visible photocatalytic performance. ► The NPs showed excellent low-temperature thermal-oxidation ability in the dark. ► The NPs could be applied as environmental catalyst without light illumination.
    Keywords: Semiconductors ; Chemical Synthesis ; Electron Microscopy ; Oxidation ; Engineering ; Chemistry
    ISSN: 0254-0584
    E-ISSN: 1879-3312
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  • 7
    Language: English
    In: Journal of Cleaner Production, 01 March 2018, Vol.176, pp.1213-1222
    Description: Water scarcity is a global environmental problem that jeopardizes human safety and socioeconomic development. Since 1952, China has implemented a large-scale tree-planting program in the country's arid regions to combat desertification. However, there is a serious risk this program will exacerbate water shortages and lower the groundwater table: the trees selected for this program were not chosen based on local environmental constraints, and their evapotranspiration exceeds the regional precipitation. However, no data on the afforestation's effects on the groundwater table is available. This is problematic because any loss of groundwater will severely constrain socioeconomic development in China's arid and semiarid regions, which already face severe water shortages. The economic concept of a groundwater opportunity cost could be used to guide socioeconomic activities to improve the sustainability of groundwater use and mitigate the potential problems caused by the Chinese afforestation program. In this paper, seven evapotranspiration models were used to provide the first estimate of the opportunity cost created by afforestation's adverse effects on the groundwater resource. The results showed that the groundwater table declined yearly throughout the study area, with mean water opportunity costs in 2011 ranging from 0.04 × 10 RMB to 11.1 × 10 RMB under nine provinces in arid and semiarid China. This study provides the first solid evidence that afforestation in arid and semiarid northern China will exacerbate the groundwater decline while creating enormous opportunity costs. Thus, the afforestation program must be urgently reassessed and the water-use efficiency of vegetation must be considered when planning future ecological restoration both to make the restoration more cost-effective and to protect the ecosphere.
    Keywords: Afforestation ; Ecological Restoration ; Evapotranspiration ; Groundwater Table ; Opportunity Cost ; Water Scarcity ; Engineering
    ISSN: 0959-6526
    E-ISSN: 1879-1786
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  • 8
    Language: English
    In: Materials and Design, March, 2013, Vol.45, p.179(11)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.matdes.2012.08.060 Byline: Xiaoliang Shi (a)(b), Mang Wang (a), Wenzheng Zhai (b), Zengshi Xu (a), Qiaoxin Zhang (a)(b), Ying Chen (c) Keywords: NiAl matrix; Ti.sub.3SiC.sub.2; Spark plasma sintering; In situ; Tribology Abstract: . Display Omitted Author Affiliation: (a) School of Mechanical and Electronic Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China (b) School of Materials Science and Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China (c) School of Mechanical and Electronic Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Beijing 100081, China Article History: Received 2 July 2012; Accepted 22 August 2012
    Keywords: Tribology -- Analysis ; Silicon Carbides -- Analysis ; Mechanical Engineering -- Analysis ; Composite Materials Industry -- Analysis
    ISSN: 0261-3069
    Source: Cengage Learning, Inc.
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  • 9
    Language: English
    In: Journal of Wuhan University of Technology (Material Science Edition), Feb, 2011, Vol.26(1), p.65(5)
    Description: Byline: Xiaoliang Shi (1,2), Xingyong Yang (2), Shuwei Wang (2), Sheng Wang (2), Qiaoxin Zhang (1,2), Yufu Wang (1) Keywords: semiconductors; chemical synthesis; optical properties; surface properties Abstract: Multi-walled carbon nanotube (MWCNT)/TiO.sub.2/C.sub.60 composite catalysts were prepared by hydrothermal method. TiO.sub.2 was deposited on the MWCNT surface. Their photocatalytic activities for degradation of Rhodamine B dye were studied. X-ray diffraction, field emission transmission electron microscopy, ultraviolet-visible light absorption spectrum and photoluminescence spectrum were carried out to characterize the composite catalysts. The results indicated that MWCNTs and C.sub.60 could greatly enhance the photocatalytic activity of TiO.sub.2. Author Affiliation: (1) School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, 430070, China (2) State Key Laboratory of Advanced Technology for Materials Synthesis & Processing, Wuhan University of Technology, Wuhan, 430070, China Article History: Registration Date: 01/03/2011 Received Date: 29/05/2009 Accepted Date: 17/10/2010 Online Date: 12/03/2011 Article note: Funded by the Natural Science Foundation of Hubei Province (No.20101j0018), the Project for Science and Technology Plan of Wuhan City (No.200910321092) and the Fundamental Research Funds for the Central Universities (No.2010-II-020)
    Keywords: Mechanical Engineering -- Optical Properties ; Mechanical Engineering -- Methods ; Composite Materials Industry -- Optical Properties ; Composite Materials Industry -- Methods ; Semiconductors (Materials) -- Optical Properties ; Semiconductors (Materials) -- Methods ; Photoluminescence -- Optical Properties ; Photoluminescence -- Methods
    ISSN: 1000-2413
    Source: Cengage Learning, Inc.
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  • 10
    Language: English
    In: Journal of Wuhan University of Technology-Mater. Sci. Ed., 2011, Vol.26(4), pp.600-605
    Description: High purity anatase nano-TiO 2 powders with high photocatalytic activity were prepared by a hydrothermal synthesis method. X-ray diffraction (XRD), field emission transmission electron microscopy (FETEM), ultraviolet-visible (UV-Vis) light absorption spectrum and photoluminescence (PL) spectrum were adopted to characterize the catalyst. Effects of temperature, time and sol concentration of hydrothermal synthesis on particle size and phases were investigated. Photocatalytic activities in the degradation of Rhodamine B Dye were studied. The experimental results indicated that photocatalytic activity of the nano-TiO 2 powers was much higher than that of P25 (Degussa).
    Keywords: TiO ; hydrothermal synthesis ; photocatalytic activity ; high purity anatase
    ISSN: 1000-2413
    E-ISSN: 1993-0437
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