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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

The constitution of niobium-cobalt alloys

Pargeter, John K. January 1966 (has links)
No description available.
12

Amorphous phase separation in a bulk metallic glass of negative heat of mixing. / 對於具有負混合熱的塊狀金屬玻璃非晶相分離的研究 / Amorphous phase separation in a bulk metallic glass of negative heat of mixing. / Dui yu ju you fu hun he re de kuai zhuang jin shu bo li fei jing xiang fen li de yan jiu

January 2012 (has links)
過去幾十年當中,金屬玻璃(包括塊狀金屬玻璃)中非晶相分離的發生已經成為了一個具有爭議性的課題。一些報告報導在具有負混合熱的Pd-Ni-P合金體系中發生了非晶相分離。然而,有一些報告聲稱相分離不能在Pd-Ni-P非晶合金中被觀察到。文獻分析表明,困難在於缺乏直接的實驗證據。 / 為了解決這個難題,示差掃描量熱儀、高分辨電子顯微鏡、掃描透射模式下的高角環射暗場相、以及能量色散X射線光譜儀等檢測儀器在我們實驗當中被使用。同時為了清楚展示非晶相分離反應,在過冷Pd₄₁.₂₅Ni₄₁.₂₅P₁₇.₅熔體被冷卻為固態非晶樣品之前引入了中間熱退火處理。 / 實驗研究了三種經由不同路徑製備的A、B、C型號樣品。結果表明在非晶/液態Pd₄₁.₂₅Ni₄₁.₂₅P₁₇.₅合金中可能存在獨特的短程有序結構,它會導致相分離的發生。同时研究發現,在大約625 K,調幅分解的持續時間的下限大概是200 s。調幅分解的時間常數R在大約625 K 下為0.002 s⁻¹。三种类型样品在不同的溫度下被退火從而獲得部分的結晶。A型號和B型號具有相似的行為。在低溫下,圓形的核心首先形成,接著發生共晶反應。在高溫下,出現了一種形狀為立方體的析出相。在C型號的樣品當中,核心和立方的析出物同時被發現。但是核心的成分分佈與A和B型號中出現的不同。同時,隨著退火時間的加長形核的數量也具有獨特的行為表現。作為對比,Pd₄₀Ni₄₀P₂₀塊狀金屬玻璃的結晶行為也被展開了研究。同樣的,以形成核心開始,但是它的成分分佈異於A和B型號的樣品。 / Amorphous phase separation in metallic glass (including bulk metallic glass) has been a controversial issue in the past several decades. There are reports saying that amorphous phase separation occurs in Pd-Ni-P, which has a negative heat of mixing among its constituent elements. However, there are also as many reports claiming that phase separation is absent in amorphous Pd-Ni-P alloys. The lack of direct experimental evidence makes the issue to be difficult to be resolved. / To solve this problem, differential scanning calorimetry (DSC), high resolution transmission electron microscopy (HRTEM), high angle annular dark field (HAADF) in scanning transmission electron microscopy, and energy dispersive X-ray spectroscopy (EDX) have been employed. Intermediate thermal annealing is introduced before an undercooled Pd₄₁.₂₅Ni₄₁.₂₅P₁₇.₅ melt is cooled down to become a solid amorphous specimen. / A-type, B-type, and C-type specimens of composition, Pd₄₁.₂₅Ni₄₁.₂₅ P₁₇.₅, have been prepared via three different cooling paths. It was found that amorphous phase separation indeed occurs in C-type specimens. Results suggest that there may be unique short range orders in amorphous/liquid Pd₄₁.₂₅Ni₄₁.₂₅P₁₇.₅, which are responsible for the phase separation. Experimental arrangements were made to study the occurrence of spinodal reaction in undercooled molten Pd₄₁.₇₅Ni₄₁.₇₅P₁₇.₅ alloys as a function of time. The lower bound of the duration of the spinodal decomposition at a temperature of {U+2248}625 K is about 200 s and the time constant R of the spinodal decomposition at a temperature of {U+2248}625 K is 0.002 s⁻¹. / A-type and B-type specimens have similar crystallization behavior. At low temperature, it starts with the formation of a spherical core and then eutectic crystallization takes over. At higher temperatures, an additional phase in the shape of a cube appears. In annealed C-type specimens, cores and cubic precipitates are also found. However, the composition profile of the cores is different and the number of nucleation events versus time has peculiar characteristics. The crystallization behavior of Pd₄₀Ni₄₀P₂₀ BMG was studied for comparison. It again starts out with the formation of a core, but with a composition profile different from those of A-type and B-type specimens. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Lan, Si = 對於具有負混合熱的塊狀金屬玻璃非晶相分離的研究 / 蘭司. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2012. / Includes bibliographical references. / Abstract also in Chinese. / Lan, Si = Dui yu ju you fu hun he re de kuai zhuang jin shu bo li fei jing xiang fen li de yan jiu / Lan Si. / Abstract of thesis --- p.i / Acknowledgements --- p.v / List of Tables --- p.x / List of Figures --- p.xi / Chapter Chapter 1 --- Introduction and literature review --- p.1 / Chapter 1.1 --- Introduction to metallic glasses --- p.1 / Chapter 1.1.1 --- Background of metallic glasses --- p.1 / Chapter 1.1.2 --- Glass transition --- p.2 / Chapter 1.1.3 --- The undercooling of liquids --- p.3 / Chapter 1.1.4 --- Crystal nucleation and growth in liquids --- p.3 / Chapter 1.1.4.1 --- Crystal Nucleation in liquids --- p.3 / Chapter 1.1.4.2 --- Crystal growth in liquids --- p.5 / Chapter 1.1.4.3 --- TTT diagram --- p.6 / Chapter 1.1.4.4 --- Crystallization in metallic glasses --- p.6 / Chapter 1.1.5 --- Glass formation methods and systems --- p.6 / Chapter 1.1.6 --- Glass forming ability and criteria --- p.8 / Chapter 1.1.7 --- Properties and applications --- p.9 / Chapter 1.2 --- The basic theory of phase separation in a binary system --- p.10 / Chapter 1.2.1 --- Thermodynamic background --- p.10 / Chapter 1.2.2 --- Solid state phase separation --- p.11 / Chapter 1.2.2.1 --- A miscibility gap of binary mixture --- p.11 / Chapter 1.2.2.2 --- Nucleation and growth mechanism --- p.12 / Chapter 1.2.2.3 --- Spinodal decomposition mechanism --- p.13 / Chapter 1.2.3 --- Liquid state miscibility gap in a binary system --- p.21 / Chapter 1.3 --- Literature review for phase separation in metallic glasses --- p.23 / Chapter 1.4 --- The aim of this thesis --- p.28 / Figures --- p.30 / References --- p.39 / Chapter Chapter 2 --- Experiments and characterization --- p.44 / Chapter 2.1 --- Introduction and the outline of the experiments --- p.44 / Chapter 2.2 --- Sample preparation --- p.45 / Chapter 2.2.1 --- Bulk metallic glasses preparation --- p.45 / Chapter 2.2.1.1 --- Preparation of clean fused silica tubes --- p.45 / Chapter 2.2.1.2 --- Weighing --- p.46 / Chapter 2.2.1.3 --- Alloying --- p.46 / Chapter 2.2.1.4 --- Fluxing --- p.47 / Chapter 2.2.2 --- Thermal annealing --- p.49 / Chapter 2.2.3 --- Specimens preparation for characterization --- p.50 / Chapter 2.2.3.1 --- Cutting, molding, grinding and polishing --- p.50 / Chapter 2.2.3.2 --- Etching --- p.51 / Chapter 2.2.3.3 --- Thinning for TEM foils --- p.51 / Chapter 2.3 --- Characterization --- p.55 / Chapter 2.3.1 --- Differential scanning calorimetry (DSC) --- p.55 / Chapter 2.3.2 --- Scanning electron microscopy (SEM) --- p.55 / Chapter 2.3.3 --- Transmission electron microscopy (CTEM and HRTEM) --- p.57 / Chapter 2.3.4 --- High angle annular dark field (HAADF) in Scanning transmission electron microscopy (STEM) --- p.58 / Chapter 2.3.5 --- Energy dispersive X-ray spectroscopy (EDX) --- p.59 / Figures --- p.62 / References --- p.69 / Chapter 3 --- p.70 / Chapter 3.1 --- Introduction --- p.70 / Chapter 3.2 --- Materials and Experimental --- p.73 / Chapter 3.3 --- Results --- p.75 / Chapter 3.3.1 --- Thermal behaviors of three types of specimens --- p.75 / Chapter 3.3.2 --- Microstructures of three types of specimens --- p.75 / Chapter 3.3.2.1 --- A-type specimens --- p.75 / Chapter 3.3.2.2 --- B-type specimens --- p.76 / Chapter 3.3.2.3 --- C-type specimens --- p.76 / Chapter 3.4 --- Discussion --- p.78 / Chapter 3.5 --- Conclusions --- p.79 / Chapter 3.6 --- Afterward --- p.79 / Figures --- p.80 / References --- p.89 / Chapter Chapter 4 --- The time constant of the spinodal decomposition in Pd₄₁.₇₅Ni₄₁.₇₅P₁₇.₅ bulk metallic glasses --- p.92 / Chapter 4.1 --- Introduction --- p.92 / Chapter 4.2 --- Materials and experimental --- p.92 / Chapter 4.3 --- Results --- p.94 / Chapter 4.3.1 --- Thermal behaviors --- p.94 / Chapter 4.3.2 --- Microstructures --- p.94 / Chapter 4.4 --- Discussion --- p.96 / Chapter 4.5 --- Conclusions --- p.98 / Figures --- p.100 / References --- p.123 / Chapter Chapter 5 --- Crystallization in homogeneous and phase-separated Pd₄₁.₂₅Ni₄₁.₂₅P₁₇.₅ bulk metallic glasses --- p.125 / Chapter 5.1 --- Introduction --- p.125 / Chapter 5.2 --- Experiments --- p.126 / Chapter 5.3 --- Results --- p.128 / Chapter 5.3.1 --- Low temperature thermal annealing at 613 K with 0≤t{U+2090} ≤ 8 h --- p.128 / Chapter 5.3.1.1 --- A-type and B-type specimens --- p.128 / Chapter 5.3.1.2 --- C-type specimens --- p.130 / Chapter 5.3.1.3 --- Pd₄₀Ni₄₀P₂₀ BMG --- p.132 / Chapter 5.3.2 --- High temperature thermal annealing --- p.133 / Chapter 5.3.2.1 --- A-type and B-type specimens --- p.133 / Chapter 5.3.2.2 --- C-type specimens --- p.135 / Chapter 5.3.2.3 --- Pd₄₀Ni₄₀P₂₀ BMG --- p.137 / Chapter 5.4 --- Discussion --- p.137 / Chapter 5.4.1 --- Formation of spherical cores --- p.138 / Chapter 5.4.1.1 --- A-type and B-type Pd₄₁.₇₅Ni₄₁.₇₅P₁₇.₅ specimens --- p.138 / Chapter 5.4.1.2 --- C-type Pd₄₁.₇₅Ni₄₁.₇₅P₁₇.₅ specimens --- p.139 / Chapter 5.4.1.3 --- Pd₄₀Ni₄₀P₂₀ BMG --- p.140 / Chapter 5.4.2 --- Formation of cubic precipitates --- p.141 / Tables --- p.142 / Figures --- p.144 / References --- p.188 / Chapter Chapter 6 --- Conclusions --- p.190 / Bibliography --- p.192
13

Fabrication and characterization of Al-Cr intermetallic compounds. / 鋁銘金屬間化合物的製造和性能測試 / Fabrication and characterization of Al-Cr intermetallic compounds. / Lü ming jin shu jian hua he wu de zhi zao he xing neng ce shi

January 2003 (has links)
by Kwong Wai Kuen = 鋁銘金屬間化合物的製造和性能測試 / 鄺偉權. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2003. / Includes bibliographical references. / Text in English; abstracts in English and Chinese. / by Kwong Wai Kuen = Lü ming jin shu jian hua he wu de zhi zao he xing neng ce shi / Kuang Weiquan. / Acknowledgement --- p.i / Abstract --- p.ii / 摘要 --- p.iii / List of tables --- p.iv / List of figures --- p.v / Table of contents --- p.xi / Chapter Chapter 1 --- Background / Chapter 1.1 --- Introduction --- p.1-1 / Chapter 1.2 --- Aluminum --- p.1-1 / Chapter 1.3 --- Chromium --- p.1-3 / Chapter 1.4 --- Intermetallics --- p.1-4 / Chapter 1.4.1 --- Alloys and intermetallics --- p.1-4 / Chapter 1.4.2 --- Properties of intermetallics --- p.1-5 / Chapter 1.4.3 --- Intermetallics 一 past to present --- p.1-6 / Chapter 1.4.4 --- Commonly used intermetallics --- p.1-7 / Chapter 1.4.5 --- Prospects of intermetallic compounds --- p.1-9 / Chapter 1.5 --- Previous works --- p.1-11 / Chapter 1.6 --- Current work --- p.1-12 / Chapter 1.7 --- Outline of thesis --- p.1-12 / References --- p.1-14 / Tables and figures --- p.1-17 / Chapter Chapter 2 --- Methodology and Instrumentation / Chapter 2.1 --- Experimental approaches --- p.2-1 / Chapter 2.2 --- Sample preparation --- p.2-2 / Chapter 2.2.1 --- Powder mixture --- p.2-2 / Chapter 2.2.2 --- Cold-pressing --- p.2-2 / Chapter 2.2.3 --- Pressureless sintering --- p.2-2 / Chapter 2.2.4 --- Hot-pressing --- p.2-3 / Chapter 2.2.5 --- Arc-melting --- p.2-4 / Chapter 2.3 --- Sample characterization --- p.2-5 / Chapter 2.3.1 --- DTA --- p.2-5 / Chapter 2.3.2 --- TMA --- p.2-5 / Chapter 2.3.3 --- Density measurement --- p.2-6 / Chapter 2.3.4 --- Microhardness measurement --- p.2-7 / Chapter 2.3.5 --- Scanning electron microscopy --- p.2-8 / Chapter 2.3.6 --- X-ray powder diffractometry --- p.2-9 / References --- p.2-10 / Figures --- p.2-11 / Chapter Chapter 3 --- Thermal analysis of Al-Cr powder mixtures / Chapter 3.1 --- Introduction --- p.3-1 / Chapter 3.2 --- Experiments --- p.3-1 / Chapter 3.3 --- Results and discussions --- p.3-2 / Chapter 3.3.1 --- DTA results --- p.3-2 / Chapter 3.3.2 --- Al-23wt%Cr --- p.3-2 / Chapter 3.3.3 --- Al-28wt%Cr and Al-33wt%Cr --- p.3-5 / Chapter 3.3.4 --- Al-46wt%Cr --- p.3-8 / Chapter 3.3.5 --- Al-55wt%Cr --- p.3-9 / Chapter 3.3.6 --- Al-79wt%Cr --- p.3-10 / Chapter 3.4 --- Reaction mechanisms in the formation of Al-Cr intermetallic compounds --- p.3-12 / Chapter 3.5 --- Summary --- p.3-12 / References --- p.3-14 / Tables and figures --- p.3-15 / Chapter Chapter 4 --- Fabrication of Al-Cr samples by hot-pressing and by arc-melting / Chapter 4.1 --- Introduction --- p.4-1 / Chapter 4.1.1 --- Hot-pressing method --- p.4-1 / Chapter 4.1.2 --- Arc-melting method --- p.4-2 / Chapter 4.2 --- Experiments --- p.4-2 / Chapter 4.3 --- Results and discussions --- p.4-3 / Chapter 4.3.1 --- Hot-pressing method for some specific compositions --- p.4-3 / Chapter 4.3.2 --- Hot-pressing method to produce low Cr content (LC) samples --- p.4-5 / Chapter 4.3.3 --- Effects of hot-pressed time and temperature --- p.4-6 / Chapter 4.3.4 --- Arc-melting method for some specific compositions --- p.4-8 / Chapter 4.3.5 --- Arc-melting method to produce LC samples --- p.4-10 / Chapter 4.4 --- Summary --- p.4-11 / Reference --- p.4-12 / Tables and figures --- p.4-13 / Chapter Chapter 5 --- Thermal expansion coefficients of arc-melted Al-Cr samples / Chapter 5.1 --- Introduction --- p.5-1 / Chapter 5.1.1 --- Thermal expansion --- p.5-1 / Chapter 5.1.2 --- Relations between thermal expansion and structural material --- p.5-1 / Chapter 5.2 --- Experiments --- p.5-2 / Chapter 5.3 --- Results and discussions --- p.5-3 / Chapter 5.3.1 --- TMA results of A1 and Cr --- p.5-3 / Chapter 5.3.2 --- TMA for Al-Cr IMCs --- p.5-3 / Chapter 5.4 --- Summary --- p.5-4 / References --- p.5-6 / Figures --- p.5-7 / Chapter Chapter 6 --- Physical properties of Al-Cr intermetallic compounds / Chapter 6.1 --- Introduction --- p.6-1 / Chapter 6.2 --- Results and discussion --- p.6-1 / Chapter 6.2.1 --- Hot-pressed samples --- p.6-1 / Chapter 6.2.1.1 --- Hot-pressed LC samples --- p.6-2 / Chapter 6.2.1.2 --- Effects of hot-pressing temperature and time --- p.6-3 / Chapter 6.2.2 --- Arc-melted samples --- p.6-4 / Chapter 6.2.3 --- Comparison between the hot-pressed sample and the arc-melted sample --- p.6-6 / Chapter 6.3 --- Summary --- p.6-7 / Tables and figures --- p.6-9 / Chapter Chapter 7 --- Conclusions / Chapter 7.1 --- Summary --- p.7-1 / Chapter 7.2 --- Future works --- p.7-2
14

Rheological measurements of bulk metallic glass forming alloys above the liquidus temperature

Shaw, Tyler A. 05 November 2004 (has links)
A high temperature high vacuum rheometer has been designed, fabricated, and tested for the study of the steady shear viscosity for multicomponent bulk metallic glass forming alloys. This rheometer has an operating range up to 1525 K, rotational frequencies of 9.4*10⁻³-3.7*10¹ radians/s, and a calibrated viscosity range of 9.6*10⁻³ and 1.2*10² Pa*s while maintaining absolute pressures pressure < 1*10⁻⁶ mbar. Zr[subscript 41.2]Ti[subscript 13.8]Cu[subscript 10.0]Ni[subscript 12.5]Be[subscript 22.5] (Vitreloy 1) is reported. The unexpected findings of non-Newtonian behavior above the liquidus temperature were observed. Observations of shear thinning, thixotropic, and viscoelastic behaviors have been made. Our results show that Vitreloy 1 can be modeled as a power law fluid, with a power law exponent of approximately -0.5 for high shear rates. We attribute the non-Newtonian behavior to structural ordering within the melt. The technological and scientific implications for non-Newtonian behavior are discussed. / Graduation date: 2005
15

Finite differenc-cellular automation modeling of the evolution of interface morphology during alloy solidification under geometrical constraint : application to metal matrix composite solidification

Napolitano, Ralph E., Jr. 12 1900 (has links)
No description available.
16

Thermoelectric power of Co-Zr and Fe-Zr amorphous alloys

From, Milton. January 1984 (has links)
No description available.
17

Thermoelectric power of Co-Zr and Fe-Zr amorphous alloys

From, Milton January 1984 (has links)
No description available.
18

Liquid phase separation and glass formation of Pd-Si alloy.

January 1997 (has links)
Hong Sin Yi, Grace. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1997. / Includes bibliographical references (leaves 50-51). / Acknowledgments / Abstract / Chapter Chapter 1 --- Introduction / Chapter 1.1 --- Metallic Glass and its application --- p.1 / Chapter 1.2 --- Glass Forming Ability (GFA) --- p.2 / Chapter 1.3 --- Equilibrium Phase --- p.3 / Chapter 1.4 --- Nucleation and Growth --- p.6 / Chapter 1.5 --- Spinodal Decomposition --- p.8 / Chapter 1.6 --- Morphology Comparison between Nucleation and Growth and Spinodal --- p.13 / Figures --- p.14 / References --- p.24 / Chapter Chapter 2 --- Experimental Method / Experimental Method --- p.25 / Figure --- p.29 / References --- p.30 / Chapter Chapter 3 --- Metastable liquid miscibility gap in Pd-Si and its glass forming ability / Introduction --- p.32 / Experimental --- p.33 / Results --- p.34 / Discussion --- p.36 / Figures --- p.40 / References --- p.49 / Bibliography --- p.50
19

Phase reactions of the alloy TIMETAL 125 and its thermomechanical treatments

Mutava, Tapiwa David January 2017 (has links)
A thesis submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy (Metallurgical Engineering) 2017 / The alloy Ti-2.7Al-5.7Fe-6Mo-6V (wt%), commercially known as Timetal 125, is used as a high strength fastener in aerostructure assemblies. Very little information is available on its properties and processing, and this study investigated its consolidation from low cost elemental powders, to achieve the minimum mechanical properties for use as a high strength fastener. Reactions during alloying and its beta transus were investigated by differential thermal analysis. The α+β phase region was established to lie between 590oC and 800oC by thermal analysis, metallography and XRD. The alloy was consolidated to ~99% theoretical density by semi-centrifugal casting, and spark plasma sintering of the blended powders. Various heat treatments were undertaken, and the microstructures were evaluated by optical and scanning electron microscopy. Tensile properties, hardness and density were measured after each heat treatment, to establish the optimal combination of mechanical properties. The experimental Timetal 125 style alloy was found to be a metastable beta titanium alloy, which could be strengthened by ageing. It had a microstructure consisting of alpha grains with fine beta precipitates in the as-cast condition, while the sintered samples had acicular precipitates and larger grains, due to the unusually long period that was required to sinter the samples. The ultimate tensile strength was >1500MPa, and elongation was ~3% in the as-cast condition, thus failing to conform to the Airbus EN6116 standard’s specification for ultimate tensile strength and elongation for a high strength fastener in the as-cast or sintered condition. After annealing the castings at 900oC for 1 hour, the ultimate tensile strength decreased to ~760MPa, while elongation increased to ~15%, which still did not conform to the Airbus standard, due to the low strength. The alloy was solution-annealed at 900oC, followed by water quenching to retain a fully βTi microstructure. The minimum properties for the Airbus standard were achieved after ageing between 500oC and 590oC for 1 hour, with an ultimate tensile strength of ~1285MPa, and elongation of ~6.3%. The strengthening depended on the amount and morphology of αTi precipitates from ageing. The αTi/βTi ratio increased with increasing temperature and holding time (shown by XRD), up to 590oC where the precipitates progressively transformed to βTi. Extending isothermal holding time coarsened the precipitates, which was deleterious to strength. There was generally a positive correlation between mean grain size and temperature or holding time, although competing transformations suppressed grain growth, particularly after heat treatment close to transformation temperatures. Although grain size had an effect on the strength of the Timetal 125 style alloy, the main mechanism was precipitation hardening by the secondary αTi. Extended ageing resulted in the formation of allotriomorphic alpha titanium, and a corresponding decrease in the ultimate tensile strength. It was not possible to subject the sintered samples to tensile testing, due to their shape. However, the sintered samples were less porous and had higher Vickers’ values than the castings, suggesting they had similar, if not higher tensile strengths. The acicular precipitates in the sintered samples were possibly martensite or omega titanium (ωTi, Pearson symbol hP3 and space group P6/mmm) although they were too fine to be detected by X-ray diffraction and too fine analyse separately by energy dispersive X-ray spectrometry. / MT 2017
20

Formation of bulk nanocrystalline materials. / CUHK electronic theses & dissertations collection

January 1999 (has links)
by Guo Wenhua. / Thesis (Ph.D.)--Chinese University of Hong Kong, 1999. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.

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