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  • 1
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    Magnesium isotopic compositions and calcium and magnesium concentrations of river waters from the Huanghe basin in China (2017)
    PANGAEA
    In:  Supplement to: Fan, Bai Ling; Zhaoa, Zhi-Qi; Tao, Fa Xiang; Li, Xiao Dong; Tao, Zheng Hua; Gao, Shuang; He, Mao Yong (2016): The geochemical behavior of Mg isotopes in the Huanghe basin, China. Chemical Geology, 426, 19-27, https://doi.org/10.1016/j.chemgeo.2016.01.005
    Details
    Publication Date: 2024-02-16
    Description: The magnesium (Mg) isotopic composition of river waters is mainly controlled by riverine Mg sources and geochemical processes. It is meaningful to characterize Mg isotope behavior for us in understanding chemical weathering and other geochemical processes, such as secondary mineral formation linked to environmental conditions. The Huanghe basin was chosen to investigate the behavior of Mg isotopes during river erosion in temperate-semiarid and arid climate. Dissolved Mg shows a wide range of d26Mg values, ranging from - 1.53 per mil to - 0.11 per mil, with most values being close to - 1.09 per mil. By comparison, most of the suspended loads are enriched in heavy Mg isotope, with d26Mg values ranging from - 2.00 per mil to - 0.62 per mil, which is controlled by mineralogy. The Mg isotopic composition in the upstream is mainly determined by the mixture between carbonate and silicate sources. When the Huanghe flows through the Loess Plateau, the dissolved Mg decreased due to the dissolution of easily dissoluble phases in loess, such as MgCl2 or MgSO4. Carbonates weathering and evaporites dissolution are the major controlling factor of the evolution of Mg isotopic composition in dissolved phase, though evaporation-related precipitation of secondary carbonates also influences the dissolved Mg isotope composition in some tributaries. The strong relationships between d26Mg and pH, temperature, and d18O suggest that the Mg isotope system bears significant information about the hydrogeochemical characteristics and climate conditions of the Huanghe basin.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Yttrium(Y) Content in Al Target on the Thickness of CrAlTiN Film by Magnetron Sputtering (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 373-374 (Mar. 2008), p. 163-166 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this experiment UDP450 was used to prepare the CrAlTiN films with different Ycontents deposited on Si(100) substrates. The thickness and structure of CrAlTiN films werecharacterized by scanning electron microscopy (SEM). The results show that the thickness ofCrAlTiN films increases with the increasing of Y contents in Al targets. Meanwhile, the structuresof these films are column structures with the least changes. XPS and EDS results indicate that Alcontents in the films also increased with the increasing of Y contents in Al targets. Voltages of Altargets were changed with the variation of Y contents in Al targets when CrAlTiN layers wereformed. The current of Al targets was a constant during producing CrAlTiN layer. The originalvoltages of Al targets during forming CrAlTiN layers increased greatly with the increase of Ycontents in Al targets. The results show that the collision probability between the neutral particlesand positive ions increased in the vacuum chamber. This indicates that the sputtering yield of Altargets is increased at a higher voltage. Consequently, the growing speed of CrAlTiN film and thesputtering yield of Al targets are all improved with the addition of Y element
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.163.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Low-Pressure Preheating Combustion Synthesis of Silicon Nitride (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 441-444 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Silicon nitride was prepared by means of low-pressure preheating combustion synthesis inthis paper. When N2 pressure is less than or equal to 2MPa, the lowest preheating temperature is about653K, reactant could make silicon nitride by combustion synthesis. The additive of ammoniumfluoride and ammonium chloride, as the reactive diluent, and Si react and make some usefulintermediate products to α -Si3N4 after thermal decomposition. The reactive diluent content must beappropriate. At the same time, with the improvement of Si3N4, as the inert diluent, content in reactant,the adiabatic flame temperature of system would reduce, and combustion reaction rate of Si alsodrops, so it is propitious to make high level of α -Si3N4
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.441.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure Evolution of Deformed Magnesium Alloy in Semi-Solid State (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 313-316 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Magnesium alloy slurry was prepared using Strain-Induced Melt Activation(SIMA)technique. The samples were quenched into water so as to fix the high temperature instantaneous microstructures. The microstructure evolution of compressed deformation Mg alloy is studied in the process of continuous heating and iso-temperature of semi-solid state. The results indicate that deformed Mg alloy (AZ91) has first occurred to have the conversion of dendrite crystal-orientedisometric crystals in the continuous heating process. When the temperature rises to the range of semisolid state, the region with high energy at the pressed stripes begins to melt, showing that the cellular structures emerge in the crystal boundary and melting micro-pool phenomena appear within the crystals. With the iso-temperature time in semisolid state prolongs, the isometric crystals can be gradually converted into spherical crystal grains
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.313.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Sintering of β-Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉 Powder Prepared by Self-Propagating High-Temperature Synthesis (SHS) (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 2179-2182 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Sintering of the Self-Propagating High-Temperature Synthesis (SHS) of β-Si3N4 powderwith 6.67 wt.% Y2O3 and 3.33 wt.% Al2O3 as sintering additives has been emphatically investigatedusing hot-press sintering process. The relative density of hot-pressed β-Si3N4 reached near to thefull densification (99.43%) at 1700℃. The similar micrographs with self-reinforcing rod-likeβ-Si3N4 grains forming an interlocking structure were observed. The better mechanical properties ofhot-pressed Si3N4, such as the hardness (16.73GPa), fracture toughness (5.72 MPa·m1/2) andbending strength (611.72MPa) values, were obtained at 1700℃. The results indicate that goodsinter ability can be obtained with the cheaply SHS of silicon nitride powder for preparing siliconnitride materials, which will make the cost of silicon nitride materials lowered
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.2179.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Densification and α/β Phase Transformation of SHS Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉 Containing Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 and Y〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 during Sintering (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 577-580 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The densification and phase transformation of high α-phase silicon nitride powdersynthesized by SHS with a combination of Y2O3 and Al2O3 sintering additives were investigated. Thedensification process occurred rapidly from 1400 to 1500 °C and was nearly finished at 1500 °C.However, the α-β transformation of silicon nitride progressed rapidly from 1500 to 1600 °C, andcompleted at 1600 °C. The phase transformation of silicon nitride lagged behind the densification ofSi3N4 ceramics. It showed that the solution and precipitation process did not play the main role in thedensification of silicon nitride. The sufficient amount of liquid phase was crucial to complete thedensification
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.577.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Silicon Nitride/Boron Nitride Composite by Combustion Synthesis (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 531-534 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Machinable silicon nitride/ hexahedral boron nitride (Si3N4/h-BN) composites were in-situsynthesized in a nitrogen (N2) atmosphere by means of combustion synthesis gas-solid reaction withsilicon (Si) powder and h-BN as raw materials. The effect of the volume fraction of h-BN on themachinable properties of Si3N4/BN composite was studied. The results show that Si powder was fullynitrified and no residual Si was found. Microstructures by a scanning electron microscopy (SEM)show Columnar crystals of β-Si3N4 are the main phase and acicular crystals of h-BN disperse β-Si3N4intergranular. With the increasing of the volume content of h-BN, the machinability of the compositeincreases, but the bending strength of composite decreases firstly and then increases. The lowestbending strength is 84.96MPa at 25% volume fraction of h-BN
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.531.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Combustion Synthesis of Magnesium Silicon Nitride Powders in the Mg-Si-N System (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 935-938 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A combustion synthesis process was developed for the synthesis of magnesium silicon nitridepowders in the Mg-Si-N system. The effects of ammonium halide addition and the nitrogen presssure onthe phase composition and microstructure of the final product were discussed in detail. It was found thatammonium halides were helpful to enhance the nitrogen infiltration, decrease the agglomeration degreeand improve the nitridation reaction. Furthermore, the nitrogen presssure greatly influenced the reactionprocess and the properties of the final MgSiN2 products, especially the phase composition. MgSiN2powders with low level of impurities (MgO and free Si) could be synthesized through combustionsynthesis process in the Mg-Si-N system
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.935.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis, characterization and function of ternary copper(II) complexes (1997)
    Springer
    Transition metal chemistry 22 (1997), S. 109-112 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ternary complexes of glycine, alanine, β-alanine, serine and ethylenediamine with copper iminodiacetate have been prepared and characterized by their i.r., u.v.-vis. and e.s.r. spectra. The data suggest that the complexes possess axial symmetry and a distorted octahedral configuration in aqueous solution. The H2O molecule on the axial copper site can be replaced by O2−. The bonding parameters, which fall between 0.84 and 0.88, indicate that the bonds between copper(II) and the ligands possess more ionic character. The ternary complex containing serine displays the highest catalytic activity in dismutation of the superoxide radical O2−. This activity may be explained on the basis of the stabilization of CuII-O2− by hydrogen bonding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018498626343
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  • 10
    Electronic Resource
    Electronic Resource
    The disappearance of an hsc70 species in mung bean seed during germination: purification and characterization of the protein (1993)
    Springer
    Plant molecular biology 21 (1993), S. 317-329 
    Details
    ISSN: 1573-5028
    Keywords: heat shock proteins ; hsc70 ; developmental regulation ; mung bean
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have purified a 73 kDa protein from the cytosolic fraction of mung bean seeds. It comprises 0.5–1% of the total protein in seeds. This purified protein is a bona fide hsc70 on the basis of several lines of evidence. First, antibodies against bovine brain hsc70 cross-react with the purified 73 kDa protein. Second, the purified protein comigrates on two-dimensional gels with one of the heat-inducible hsc70s in mung bean seedlings. Third, similar to other hsc70 species, the purified 73 kDa protein has a high affinity for ATP. Finally, the hydrolysis of ATP by the purified protein can be stimulated by peptides; ATPase activity increases from 40 nmol/h to 165 nmol/h per mg of protein. The purified mung bean hsc70 autophosphorylates at a substoichiometric level. Moreover, the amount of this hsc70 species diminishes while new species of hsc70s appear after germination, suggesting that the expressionof hsc70 in mung bean is subject to developmental regulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019947
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