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排序方式: 共有121条查询结果,搜索用时 15 毫秒
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M.A. PampillónP.C. Feijoo E. San Andrés M. Toledano-LuqueA. del Prado A.J. BlázquezM.L. Lucía 《Microelectronic Engineering》2011,88(7):1357-1360
Amorphous Gd2O3 and Sc2O3 thin films were deposited on Si by high-pressure sputtering (HPS). In order to reduce the uncontrolled interfacial SiOx growth, firstly a metallic film of Gd or Sc was sputtered in pure Ar plasma. Subsequently, they were in situ plasma oxidized in an Ar/O2 atmosphere. For post-processing interfacial SiOx thickness reduction, three different top metal electrodes were studied: platinum, aluminum and titanium. For both dielectrics, it was found that Pt did not react with the films, while Al reacted with them forming an aluminate-like interface and, finally, Ti was effective in scavenging the SiO2 interface thickness without severely compromising gate dielectric leakage. 相似文献
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In iron-making processes with rare-earth-containing iron ores as feeds, therare-earth oxides report to slags. While most rare-earth oxides in the slags can be recovered by a combination of high intensity magnetic separation with gravity separation processes, europium and scandium remain in tailings of the slag mineral separation process. Crystal structure and chemical composition of the europium and scandium-bearing “mineral” in the slags have been determined by X-ray diffraction and electron microprobe analyses. This “mineral” was identified as rare-earth-bearing barium fluorophlogopite (REBF). Flotation experiments were conducted to investigate the flotation behaviors of the REBF. Experimental results show that the REBF can be collected by using dodecylammonium acetate, sodium oleate or a combination of both in an appropriate proportion and sequence. The flotation reaction of the REBF with the collectors was discussed with the help of infrared spectra and electrokinetic measurements. Physical adsorption of the cationic collector and chemical adsorption of the anionic collector on the surface of the negatively charged REBF were observed. Synergistic effect is significant when addition of sodium oleate is followed by addition of dodecylammonium acetate during flotation. 相似文献
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Dmytro Korablov Jonas Ångström Morten B. Ley Martin Sahlberg Flemming Besenbacher Torben R. Jensen 《International Journal of Hydrogen Energy》2014
Scandium(II)hydride, ScH2, and scandium(III)chloride, ScCl3, are explored as additives to facilitate hydrogen release and uptake for magnesium hydride. These additives are expected to form more homogeneous composites with Mg/MgH2 as compared to metallic scandium. However, scandium(III)chloride, reacts with MgH2 during mechano-chemical treatment and form ScH2 and MgCl2 (that later crystallise during heat treatment). The composite MgH2−ScH2 was investigated using in-situ synchrotron radiation powder X-ray diffraction during up to five cycles of continuous release and uptake of hydrogen at isothermal conditions at 320, 400 and 450 °C and p(H2) = 100–150 or 10−2 bar. The data were analysed by Rietveld refinement and no reaction is observed between either MgH2/ScH2 or Mg/ScH2 during cycling. The extracted sigmoidal shaped curves for formation or decomposition of Mg/MgH2 suggest that a nucleation process is preceding the crystal growth. The reaction rate increases with increasing number of cycles of hydrogen release and uptake at isothermal conditions possibly due to activation effects. This kinetic enhancement is strongest between the first cycles and may be denoted an activation effect. 相似文献
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P. P. Donohue M. A. Todd C. J. Anthony A. G. Brown M. A. C. Harper R. Watton 《Integrated ferroelectrics》2013,141(1-4):25-34
Abstract There is interest in ferroelectric thin films for uncooled IR detector applications. Currently the processing of these devices takes a fully integrated approach where the thin films are deposited directly onto underlying CMOS readout circuitry, thereby imposing severe limits on the thermal budget available for the crystallisation of the ferroelectric material. This is incommensurate with obtaining the best ferroelectric properties from materials such as lead scandium tantalate (PST) which requires elevated temperature processing to attain the highest merit figures for IR detection. In this paper thin film PST processed within the CMOS survivability envelope will be compared to that processed at temperatures up to 850°C. A novel interconnect wafer technology will be outlined which enables processing to be extended to such temperatures. It will be shown that elevated temperature processing of the PST film can result in dramatic improvement of the materials merit figure for IR detection 相似文献
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Adsorption of Sc onto two chelating resins, aminomethyl phosphonic (TP 260) and iminodiacetate (TP 209), and one solvent impregnated resin with bis(2,4,4-trimethylpentyl) phosphinic acid (TP 272) was investigated. Resin capacities, ion selectivity, adsorption kinetics, and equilibrium isotherms were measured. Sc speciation was predicted using chemical thermodynamic data. The kinetic data were fit to empirical models. The adsorption behavior was established by fitting equilibrium data to Langmuir and Freudlinch isotherms. Process variables such as pH, sulfate concentration, and temperature were considered. This new information will be used for hydrometallurgical process selection for Sc recovery. 相似文献
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柯家骏 《稀有金属(英文版)》1992,(3)
Scandium was recovered from dilute chloride solutions with potassium salt of saturated C_8~C_(12)fattyacids as surfactant by Ion flotation.The optimum comprehensive results of physical properties,stability andscandium concentration of the foam formed with potassium caprate CH_3(CH_2)_8 COOK can be obtained.Re-covery of scandium in the foam was 98% at pH 3.8~5.0 and 25~55℃.The experimental results of 0.3 L/minairflow rate was satisfactory for flotation column.It is of a great potential for using ion flotation technique toconcentrate scandium from dilute solutions. 相似文献
9.
The optimum conditions for the extraction-chromatography by using 2-ethylhexyl-2-ethylhexyl-phosphonate resin to separate scandium(Ⅲ)from large amounts of other metal ions were reported.A me-thod for the separation and determination of microamount of scandium has been developed.This methodgives higher accuracy and reproducibility than solvent extraction with PMBP,especially,for the samplescontaining high content of titanium.Many shortcomings of other methods ever reported can be overcomeby the present method. 相似文献
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含钪铝合金的研究进展 总被引:20,自引:0,他引:20
钪是优化铝合金性能最为有效的合金元素,含钪铝合金强度高,塑性好,焊接性能,耐腐蚀性能等优良,是舰船、航空航天、核能等国防军工尖端领域用新一代铝合金结构材料,通过对Al-Mg-Sc和Al-Zn-Mg-Sc合金的研究状况分析,综述了钪与铝及铝合金的作用关系和对性能的改善作用。并提出我国含钪铝合金的研究方向。 相似文献