Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 45 for “"secondary phase"”.
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Design of Superelastic Secondary-Phase-Toughened Alloys
… the transformation product by designing a multi-phase alloy combining a superelastic phase with a stable elasto-plastic phase. In particular, nano- and micro-scale precipitates, lamellar structures, and bulk matrix morphologies of TiNi are investigated in combination with stable (V,Nb)-Ti matrix …
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Magneto-transport properties of manganite/secondary phase inhomogeneous systems
… related properties in manganites, by introducing secondary phases into a ferromagnetic manganite forming an inhomogeneous manganite/secondary phase system. TiO2 insulator was introduced as a secondary phase into the ferromagnetic La0.7Ba0.3MnO3 (LBMO) manganite with ratios (x=0.02, x=0.04, x=0.06 …
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A Study of the Structure of Bovine Casein Micelles and the Secondary Phase of Milk Coagulation Using Immobilized Enzymes
The location of (kappa)-casein in casein micelles, and specifically the distribution of glyco- and carbohydrate-poor (kappa)-casein, has been studied by treating isolated casein micelles with soluble and immobilized proteases, (chymosin and pepsin) and soluble and immobilized (neuraminidase). …
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Microscopic and Spectroscopic Investigation Of: I. Copper-Additive Systems in Electroplating Bath. II. Supported Phospholipid Bilayer Systems
Second, soft imaging mode of AFM and phase modulated ellipsometry are used to observe the phase transition process of supported lipid bilayer systems with and without the influence of other macromolecules. Addition of a weak polyelectrolyte, poly(methacrylic acid) (PMA), to a supported phospholipid …
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Explaining a Low-Temperature Magnetic Order in Annealed van der Waals Semiconductor CrSBr
… that the order is the magnetic contribution of secondary phases, which we image and identify via SEM-EDS analysis. We determine that the secondary phase Cr₂S₃ is formed during annealing at 750°C or above and that the secondary phase CrBr₃ is also formed during annealing at 850°C.
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Apophyllite weathering and the aqueous geochemistry of a Karoo breccia pipe
… with hydrothermal environments. It is a major secondary phase occupying fractures in a dolerite breccia pipe on the farm Kopoasfontein, outside Calvinia in the western Karoo, South Africa. Groundwater abstracted from this breccia is uncharacteristically alkaline (pH 10) and high in fluoride (11 …
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Waste characteristics of spent nuclear fuel from a pebble bed reactor
… States repository at Yucca Mountain. Third, a secondary phase forms between the layers of silicon carbide and the uranium oxide fuel. The secondary phase retards the release of radionuclides to the environment.
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Effect of Dopants on the Local Atomic Structure and Sintering Behavior of Bismuth Sodium Titanate
… the effects of a model dopant -cobalt- on the phase formation, sintering behavior and microstructure of BNT as well as on the resulting dielectric and piezoelectric properties. In this regard, a core issue was to determine the preferred lattice site of Co in BNT. BNT was synthesized from oxide …
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Computational Scheme Guided Design of a Hybrid Mild Gasifier
… devolatilization model into the existing 2D multiphase reaction model, (b) expand the 2D model to 3D and (c) utilize the improved model to investigate the mild-gasification process and guide modification of the mild-gasifier design. The Eulerain-Eulerian method is employed to calculate both the …
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Development of a Simulation Model for Fluidized Bed Mild Gasifier
… method is employed to calculate both the primary phase (air) and secondary phase (coal particles). The Navier-Stokes equations and seven species transport equations are solved with three heterogeneous (gas-solid), two homogeneous (gas-gas) global gasification reactions. Development of the model …
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Investigating Microbial Trace-fossils and Abiotic Alteration in Hydrovolcanic Tuffs of the Fort Rock Volcanic Field, Oregon
… fluid composition and flux, temperature and secondary phase formation are influences on microboring formation. This study is the first report of reputed endolithic microborings in basalts erupted in a continental lacustrine setting.
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Structural and electrical characterisation of some ABO₃ perovskites
… XRD of La₁₋ₓSrₓGaO₃₋δ (x = 0-0.2) showed the secondary phase of SrGa₃O₇ at >5 mol% Sr. The cell deformed with increasing Sr dopant concentration. In the XRD patterns of LaGa₁₋yCryO₃₋δ (y = 0-0.2) the cell also deformed with increasing Cr dopant concentration. The peak at ca. 32° showed a …
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Fabrication and Characterization of a Porous Clad Optical Fiber Gas Sensor
… porous cladding region is made from a spinodally phase separable glass where the secondary phase is removed through dilute acid leaching. A non-phase separable glass composition is used for the core region. The properties of the phase separable glass are dependent on the processing conditions and …
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Social exclusion and cultural dissonance as salient risk factors in the engagement and retention of Gypsy traveller students in secondary education
… disengagement and underachievement in the secondary phase of education has exercised educationalists and policy makers for over forty years. Historically, deficit theory associated with an impoverished and disadvantaged nomadic lifestyle prevailed but this is no longer sustainable. The vast …
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Samarium strontium cobalt oxide – samarium doped ceria carbonate (SSC-SDCC) as a new potential composite cathode material for low temperature solid oxide fuel cell
… chemical compatibility with lesser appearance of secondary phase. From EIS results, the area specific resistance (ASR) value at operating temperatures 600 ℃ were ten times smaller than the ASR value offered at operating temperatures 450 ℃. The smallest ASR value was 5.06 Ωcm2 with the activation …
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Crystallization of magnesium sialon liquids and glasses
… up to 135o0 c.<br/>A previously unknown MgSiAlON phase, termed Q-phase, has been crystallized as a secondary phase from MgSiAlON liquids in the 3M/4X plane in association with forsterite.
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Micromechanical modeling of the toughening mechanisms in particle-modified semicrystalline polymers
… toughened by the addition of a well-dispersed secondary phase. In particular, when the average interparticle matrix ligament thickness, A, of the blend is reduced below a critical length parameter, Ac, dramatic jumps in toughness levels are observed. This critical parameter is a specific …
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MOLTEN STEEL INTERACTIONS WITH TUNDISH LININGS AND REFRACTORY GLAZES
… occurs due to the exudation of a liquid secondary phase found in dead-burned magnesia aggregates. Through corrosion studies, it was determined that basic tundish cover fluxes target the silica-rich phases often found in these tundish linings (such as olivine). Experimental studies also …
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Chemical selection rules of single-phase high-entropy oxides
… usually form composites instead of a single-phase, solid solution. In this research, twenty high-entropy lanthanide candidates were synthesized and examined to explore the function of two potential parameters: (1) cation size mismatch, and (2) preferred valence states. The oxide candidates …
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Case Study: The effect of pallet design on the performance of semi-automatic and fully-automatic warehouses
… facilities. This research was conducted in two phases. The primary phase was a mix mode questionnaire (phone interview and hard copy questionnaire) that was used to survey members of different industries, such as pallet manufacturers, equipment manufacturers, and pallet users. The secondary …
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