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  • 1
    Electronic Resource
    Electronic Resource
    Factors affecting the induction of pollen plants of intergeneric hybrids of Triticum aestivum X Triticum-Agropyron (1985)
    Springer
    Theoretical and applied genetics 70 (1985), S. 294-299 
    Details
    ISSN: 1432-2242
    Keywords: Anther culture ; Pollen callus (plantlet) ; Induction frequency ; Triticum aestivum ; Agropyron glaucum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Experimental results showed that the use of potato extract as a basic component of culture medium had a promoting effect on producing calli in anther culture of the intergeneric hybrids of Triticum aestivum × Triticum-Agropyron (intermediate type). The induction frequencies of pollen callus on the Potato-II medium containing potato extract as the main component was much higher than that found on N6 and W5 media. The induction frequencies of pollen callus and green plantlets in four intergeneric hybrid material inoculated at the late-uninucleate pollen stage were all higher than those inoculated at the mid-uninucleate stage. Appropriate increases in culture temperature significantly increased pollen callus induction frequencies of the intergeneric hybrids. The genotype and physiological state of anther donor plants also influenced pollen callus and green plantlet induction frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00304914
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Block pivot methods for solving frictional contact problems (1995)
    Springer
    Acta mechanica Sinica 11 (1995), S. 51-58 
    Details
    ISSN: 1614-3116
    Keywords: elastic frictional contact ; trial and error method ; mathematical programming method ; block pivot method ; convergence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Based on elementary group theory, the block pivot methods for solving two-dimensional elastic frictional contact problems are presented in this paper. It is proved that the algorithms converge within a finite number of steps when the friction coefficient is “relative small”. Unlike most mathematical programming methods for contact problems, the block pivot methods permit multiple exchanges of basic and nonbasic variables.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02487184
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Smoothing Newton method for solving two- and three-dimensional frictional contact problems (1998)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 41 (1998), S. 1001-1027 
    Details
    ISSN: 0029-5981
    Keywords: frictional contact problem ; system of non-differentiable equations ; smoothing Newton method ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Two- and three-dimensional frictional contact problems are uniformly formulated as a system of non-differentiable equations based on variational inequality theory. Through constructing a simple continuously differentiable approximation function to the non-differentiable one, the smoothing Newton method is directly implemented as an exact method. Both the global convergence and the local quadratic convergent rate of the method are guaranteed. None of the additional variables and linear approximations on Coulomb friction law is introduced and hence the formulation exactly describes the frictional contact phenomenon in both two- and three-dimensional cases. Numerical experiments suggest that the method is very efficient and promising. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 4
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    Method for Simultaneous Measure of Sorption and Swelling of the Block Coal under High Gas Pressure (2012)
    American Chemical Society (ACS)
    Details
    Publication Date: 2012-06-19
    Description: Energy & Fuels DOI: 10.1021/ef3001168
    Print ISSN: 0887-0624
    Electronic ISSN: 1520-5029
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Process Engineering, Biotechnology, Nutrition Technology
    Published by American Chemical Society (ACS)
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  • 5
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    Materials, Vol. 12, Pages 2050: Liquid Phase Assisted Superplastic Deformation of TiO2-Doped ZTA Ceramics (2019)
    MDPI
    In: Materials
    Details
    Publication Date: 2019
    Description: In this study, the compressive deformation of zirconia toughened alumina (ZTA) ceramics doped with different amounts of TiO2 dopants were investigated in the temperature range of 1300–1400 °C to evaluate the stress exponent (n value) and apparent deformation activation energy (Q value). With 0–8 wt.% TiO2 dopants, the n values and Q values of the TiO2-doped ZTA ceramics were calculated as 2–3 and 605–749 kJ/mol, respectively. Moreover, three grain boundary features were observed in these deformed materials, named the clean grain boundary, thin liquid phase grain boundary, and thick liquid phase grain boundary. Based on the deformation behavior and microstructure evolution, it was found that the lower apparent activation energy and higher strain rate of TiO2-doped ZTA ceramics are intensively related to the grain boundary feature.
    Electronic ISSN: 1996-1944
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by MDPI
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  • 6
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    Acceleration Characteristics of a Rock Slide Using the Particle Image Velocimetry Technique (2016)
    Hindawi
    Details
    Publication Date: 2016-05-18
    Description: The Particle Image Velocimetry (PIV) technique with high precision and spatial resolution is a suitable sensor for flow field experiments. In this paper, the PIV technology was used to monitor the development of a displacement field, velocity field and acceleration field of a rock slide. It was found that the peak acceleration of the sliding surface appeared earlier than the peak acceleration of the sliding body. The characteristics of the rock slide including the short failure time, high velocities, and large accelerations indicate that the sliding forces and energy release rate of the slope are high. The deformation field showed that the sliding body was sliding outwards along the sliding surface while the sliding bed moved in an opposite direction. Moving upwards at the top of the sliding bed can be one of the warning signs for rock slide failure.
    Print ISSN: 1687-725X
    Electronic ISSN: 1687-7268
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Hindawi
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  • 7
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    Sustainability, Vol. 9, Pages 628: The Biogeophysical Effects of Revegetation around Mining Areas: A Case Study of Dongsheng Mining Areas in Inner Mongolia (2017)
    MDPI Publishing
    Details
    Publication Date: 2017-04-18
    Description: The biogeophysical effects of land cover change (LCC) on land surface temperature are largely understood, especially in tropical and boreal zones, but fewer studies have reported the biogeophysical consequences of ecological restoration of mining areas located in arid and semi-arid temperate zones. In this study, we employed 2000–2015 satellite-based net radiation (Rn) and latent heat flux (LE) data from mining areas (taking Dongsheng in Inner Mongolia as an example) and adjacent ecological restoration areas to understand the biogeophysical effect of revegetation around mining areas. The results showed that revegetation increased Rn (0.25 ± 0.17 W/m2) and LE (0.43 ± 0.26 W/m2). The warming effect of increased Rn (∆Rn), however, was completely offset by the cooling effect of increased LE (∆LE), thus revegetation caused an overall cooling effect of −0.18 ± 0.17 W/m2. Land surface temperature (LST) from mining areas and adjacent ecological restoration areas also showed that revegetation decreased LST (∆LST being −0.2 ± 0.1 K). The difference of ∆Rn and ∆LE explained 27% of the ∆LST variations. These findings reinforce our understanding for the potential climatic benefits of the ecological restoration around mining areas in arid and semi-arid temperate zones.
    Electronic ISSN: 2071-1050
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI Publishing
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  • 8
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    TGF-β1 and FGF2 Stimulate the Epithelial–Mesenchymal Transition of HERS Cells Through a MEK-Dependent Mechanism (2014)
    Wiley
    Details
    Publication Date: 2014-03-11
    Description: Hertwig's epithelial root sheath (HERS) cells participate in cementum formation through epithelial–mesenchymal transition (EMT). Previous studies have shown that transforming growth factor beta 1 (TGF-β1) and fibroblast growth factor 2 (FGF2) are involved in inducing EMT. However, their involvement in HERS cell transition remains elusive. In this study, we confirmed that HERS cells underwent EMT during the formation of acellular cementum. We found that both TGF-β1 and FGF2 stimulated the EMT of HERS cells. The TGF-β1 regulated the differentiation of HERS cells into periodontal ligament fibroblast-like cells, and FGF2 directed the differentiation of HERS cells into cementoblast-like cells. Treatment with TGF-β1 or FGF2 inhibitor could effectively suppress HERS cells differential transition. Combined stimulation with both TGF-β1 and FGF-2 did not synergistically accelerate the EMT of HERS. Moreover, TGF-β1/FGF2-mediated EMT of HERS cells was reversed by the MEK1/2 inhibitor U0126. These results suggest that TGF-β1 and FGF2 induce the EMT of HERS through a MAPK/ERK-dependent signaling pathway. They also exert their different tendency of cellular differentiation during tooth root formation. This study further expands our knowledge of tooth root morphogenesis and provides more evidence for the use of alternative cell sources in clinical treatment of periodontal diseases. J. Cell. Physiol. © 2014 Wiley Periodicals, Inc.
    Electronic ISSN: 1097-4652
    Topics: Biology , Medicine
    Published by Wiley
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  • 9
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    Microstructure and wear properties of nickel-based surfacing deposited by plasma transferred arc welding (2013)
    Elsevier
    Details
    Publication Date: 2013-08-01
    Print ISSN: 0257-8972
    Electronic ISSN: 1879-3347
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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  • 10
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    Failure Mechanism of Rock Bridge Based on Acoustic Emission Technique (2015)
    Hindawi
    Details
    Publication Date: 2015-07-28
    Description: Acoustic emission (AE) technique is widely used in various fields as a reliable nondestructive examination technology. Two experimental tests were carried out in a rock mechanics laboratory, which include (1) small scale direct shear tests of rock bridge with different lengths and (2) large scale landslide model with locked section. The relationship of AE event count and record time was analyzed during the tests. The AE source location technology and comparative analysis with its actual failure model were done. It can be found that whether it is small scale test or large scale landslide model test, AE technique accurately located the AE source point, which reflected the failure generation and expansion of internal cracks in rock samples. Large scale landslide model with locked section test showed that rock bridge in rocky slope has typical brittle failure behavior. The two tests based on AE technique well revealed the rock failure mechanism in rocky slope and clarified the cause of high speed and long distance sliding of rocky slope.
    Print ISSN: 1687-725X
    Electronic ISSN: 1687-7268
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Hindawi
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