| The Role of eIF4E Activity in Breast Cancer |
Aug-2009 |
12 pages |
| Authors:
Thomas A Hughes; L A Coleman; S Satheesha; LEEDS UNIV (UNITED KINGDOM)
|
 | Increased eIF4E expression occurs in many breast cancers and makes fundamental contributions to carcinogenesis by stimulating expression of cancer-related genes at post-transcriptional levels. This key role is highlighted by the facts that eIF4E levels can predict prognosis and that eIF4E is an established therapeutic target. However, eIF4E activity is a complex function of expression levels and phosphorylation statuses of eIF4E and its regulatory proteins. Our hypothesis was that combined analyses ... |
|
| Rare-Earth Oxide Ion (Tm3+, Ho3+, and U3+) Doped Glasses and Fibres for 1.8 to 4 Micrometer Coherent and Broadband Sources |
24 JUL 2006 |
9 pages |
| Authors:
Billy Richards; Shaoxiong Shen; Animesh Jha; LEEDS UNIV (UNITED KINGDOM)
|
| This report results from a contract tasking University of Leeds as follows: Task 1 (0-5 months): Optimise tellurium oxide (TeO2), fluorine-containing silicate (SiOF2) and germanate (GeOF2) glass hosts for each dopant by characterising the spectroscopic properties, including absorption and emission cross-sections and the lifetimes of the lasing levels. Design multimode fibres for the analysis of pump photon ion interaction, and for examining any detrimental effects. A preliminary investigation on various ... |
|
| Bandwidth Efficient Pilot Assisted Transmission Over Double-Selective Wireless Fading Channels Using Superimposed Training |
MAY 2006 |
18 pages |
| Authors:
Mounir Ghogho; LEEDS UNIV (UNITED KINGDOM)
|
| We propose to estimate time-varying frequency-selective channels using data-dependent super- imposed training (DDST) and a basis expansion model (BEM). The superimposed training consists of the sum of a known sequence and a data-dependent sequence, which is unknown to the receiver. The data-dependent sequence cancels the effects of the unknown data on channel estimation. Symbol detection is performed using MMSE equalization. The method is compared to time-division-multiplexing-based methods. |
|
| Novel Computational Approaches Using Biotechnology Information for Chemical Toxicity Prediction |
26 MAR 2004 |
38 pages |
| Authors:
Philip Judson; LEEDS UNIV (UNITED KINGDOM)
|
| This report results from a contract tasking Lhasa Limited as follows. The contractor will investigate techniques to apply computational methodologies and biotechnology database information to predicting the possible toxicity of chemicals. The goal is to combine available information on chemical structures and biotoxicity to predict toxicity of a chemical from its structure. Routes of entry into the body, organs and systems affected, biological half life, modes of inactivation, and dose-response ... |
|
| A Numerical Study of Cool Flame Development Under Microgravity |
04 AUG 2000 |
8 pages |
| Authors:
R. Fairlie; J. F. Griffiths; H. Pearlman; LEEDS UNIV (UNITED KINGDOM)
|
| The existence and spatial development of hydrocarbon cool flames in a spherical vessel under the influence of mass and thermal diffusion have been investigated by numerical methods. The purpose is to examine the nature of the interaction of the physics and chemistry that may drive an oscillatory reaction. The conditions correspond to those that would be experienced at zero gravity, as has been recently put to experimental test. Comparisons and ... |
|
| Fibre Laser At 589nm Using Pr+3 - Doped Fluoride Glass |
31 DEC 1998 |
9 pages |
| Authors:
Animesh Jha; LEEDS UNIV (UNITED KINGDOM)
|
| This report results from a contract tasking University of Leeds as follows: The contractor will identify the preferred fluoride glass host for the 589nm Pr+3 doped fiber laser, carry out a full optical and spectroscopic characterization of the Pr+3 doped glass, model the lasing behaviour at 589nm, and produce a small number of glass rods suitable for fibre drawing and gain measurements. |
|
| Cr3+-Doped Vibronic Laser In Fluoroaluminate Glass |
30 OCT 1998 |
6 pages |
| Authors:
Animesh Jha; LEEDS UNIV (UNITED KINGDOM)
|
| This report results from a contract tasking University of Leeds as follows: The contractor will investigate the possibilities for a Cr(3+) doped glass fibre laser, which may be fluoride, oxyfluoride, or oxide, and will be a vibronic laser tunable over a broad band that will enable single step frequency doubling to 589nm or direct generation of 589nm. |
|
| Spontaneous Ignition of Hydrocarbon Fuels at Temperatures in the Range 750 - 1500 K |
1998 |
63 pages |
| Authors:
John Frederick Griffiths; LEEDS UNIV (UNITED KINGDOM)
|
| This report results from a contract tasking The University of Leeds as follows: The contractor will investigate methods for enhancing the initiation of combustion in hydrocarbon fuels as outlined in his proposal submitted in April 1998. |
|
| 14TH International Symposium on Gas Kinetics, Book of Abstracts |
96 |
|
| Authors:
LEEDS UNIV (UNITED KINGDOM)
|
|
| Coating Layer Formation Mechanism in Coating of Si3N4 Particles. |
1995 |
|
| Authors:
C. M. Wang; X. L. Zhe; LEEDS UNIV (UNITED KINGDOM)
|
 | This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: basic topics:, composite materials materials and material types:, al2o3 coatings, ceramics, coatings, layers, si3n4 particulates material characteristics and data fields:, homogeneous testing and test conditions:, eds, sem, tem manufacturing:, hydrolysis, polymerization miscellaneous and special technical terms:, china national science council, morphology, nucleations. |
|
| Cardiovascular Control During Stimulated Hypergravity |
22 DEC 94 |
9 pages |
| Authors:
Roger Hainsworth; LEEDS UNIV (UNITED KINGDOM)
|
| A model of the circulation was developed using anesthetized dogs which allowed blood pressures and flows at different levels of the body to be changed in ways that simulated the events occurring during acceleration. In particular the responses were examined to decreases in pressure to the carotid baroreceptors and increases in pressure in the splanchnic circulation, changes that would occur during + Gz acceleration. Splanchnic congestion was found to elicit ... |
|
| The Effect of Process Variables on the Mechanical Alloying of Iron Aluminide |
1994 |
|
| Authors:
E. C. Deane; R. F. Cochrane; LEEDS UNIV (UNITED KINGDOM)
|
| This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: experimental materials and material types: fe-25 at pct al materials related terms: elongation, equiaxed grain, fracture, kinetic energy, lamellae, morphology, particle size, recrystallization, sem, stoichiometry, tem, volume fraction, x-ray diffraction testing and test conditions: ultrasonics processing: ball milling, cold welding, powder metallurgy miscellaneous and special technical terms: aluminides, iron alloys, microstructure. ... |
|
| The Dependence of the 'Relaxor' Type of Dielectric Response on Chemical Composition: A Study of Zirconium-Substituted Lead Magnesium Niobate. |
1994 |
|
| Authors:
Andrew W. Tavernor; Noel W. Thomas; LEEDS UNIV (UNITED KINGDOM)
|
| Ceramics of lead magnesium niobium zirconium oxide, Pb(Mg((1-x)/3)Nb2((1-x)/3)Zr(x))O3 (0 < x < 0.3), have been fabricated and characterized, with 'relaxor' ferroelectric properties shown by all compositions. Samples have been prepared in a two-stage 'mixed oxide' synthesis, with XRD studies confirming the existence of a solid solution for each composition in the range. A full dielectric characterization has been carried out, with measurements made of epsilon(r)-prime and epsilon(r)-double-prime versus temperature at ... |
|
| In Situ Scanning Electron Microscope Studies of Fracture in Particulate-Reinforced Metal-Matrix Composites. |
1994 |
|
| Authors:
P. M. Mummery; B. Derby; LEEDS UNIV (UNITED KINGDOM)
|
| In situ observations of specimen surfaces have been used to characterize the fracture behavior of particulate-reinforced metal-matrix composites. composite of silicon carbide particle sizes 3, 10, and 30 micrometers with volume fractions of 5, 10, and 20% in commercial-purity aluminum and aluminum-1%magnesium matrices were studied. the results of this surface study are compared with complementary metallographic studies of sectioned specimens illustrating behavior from the bulk. significant differences between the results ... |
|
| The Measurement of Transverse Mechanical Properties of Polymer Fibres. |
1994 |
|
| Authors:
T. Kotani; J. Sweeney; I. M. Ward; LEEDS UNIV (UNITED KINGDOM)
|
| We report developments in the measurement of transverse elastic properties of a range of polymer fibers. The cylindrical fiber specimen is compressed across a diameter between a pair of parallel flat plates by a known load, while two quantities are measured; the width of the rectangular contact zone at one of the fiber-plate boundaries, and the degree of diametrical compression in the direction of the compressing force. Both measurements are ... |
|
| The Measurement of Transverse Mechanical Properties of Polymer Fibres. |
1994 |
|
| Authors:
T. Kotani; J. Sweeney; I. M. Ward; LEEDS UNIV (UNITED KINGDOM)
|
| We report developments in the measurement of treansverse elastic properties of a range of polymer fibers. The cylindrical fiber specimen is compressed across a diameter between a pair of parallel flat plates by a known load, while two quantities are measured; the width of the rectangular contact zone at one of the fiber-plate boundaries, and the degree of diametrical compression in the direction of the compressing force. Both measurements are ... |
|
| Proceedings of the International Workshop on Computational Electronics Held at Leeds University (United Kingdom) on August 11-13 1993 |
AUG 93 |
338 pages |
| Authors:
LEEDS UNIV (UNITED KINGDOM)
|
| The 1993 International Workshop on Computational Electronics took place at Leeds in England. The aim of the workshop is to allow researchers to focus on the computational aspects of solid-state device modelling. This encompasses new device and carrier transport models, numerical and computational techniques, computational implementation of transport theory (including quantum) , developments in modelling electronic structures, new techniques in computer visualization of models. This year an underlying theme associated ... |
|
| Microstructure and Tensile Properties of a Cast Aluminium Alloy/SiC composite |
93 |
|
| Authors:
N. Ham; G. Pollard; R. Stevens; LEEDS UNIV (UNITED KINGDOM)
|
| The tensile and microstructural properties of a sand cast aluminium alloy a356 composite reinforced with up to 20v% sic particles and unreinforced matrix alloy have been tested. the microstructure of this alloy has been changed dramatically by the presence of sic particles. grain refinement of both its aluminum and silicon phases have been observed. this reveals how many defects have been induced by the presence of sic particles. a higher ... |
|
| Interface Structure and Fractography of a Magnesium-Alloy, Metal-Matrix Composite Reinforced With SiC Particles |
93 |
|
| Authors:
B. Inem; G. Pollard; LEEDS UNIV (UNITED KINGDOM)
|
| The interfacial structure in sic-particle-reinforced, as-cast and heat-treated magnesium-alloy-matrix composites was investigated using analytical electron microscopy. no extensive chemical reactions were observed between the magnesium and the sic particles or the sic and the eutectic phase. however, most of the eutectic phase appeared to nucleate at the surface of the sic particles. in addition to the lamellar eutectic, a fine eutectic and mg(sub 2)si particles have been identified at the ... |
|
| Crack Stopping Mechanisms in SiC/MgO Particulate Composites |
93 |
|
| Authors:
J. Luo; R. Stevens; LEEDS UNIV (UNITED KINGDOM)
|
| Dense SiC particle-reinforced MgO composites have been fabricated. The mechanical properties of the composites have been evaluated. SEM and TEM were used to characterize the microstructure and fracture mechanisms. The fracture toughness increased nearly 100% when the volume fraction of SiC particles was increased to 30%. There are three mechanisms affecting the toughness of the composites: crack deflection, crack bridging and microcracking. The fracture toughness of the composites has been ... |
|
| Dislocation Loops in Alpha-Silicon Nitride |
93 |
|
| Authors:
Chong-Min Wang; Frank L. Riley; Francisco Castro; Inigo Iturriza; LEEDS UNIV (UNITED KINGDOM)
|
| Thin foils of fully dense, but only partially transformed, hot pressed silicon nitride materials have been examined by high resolution transmission electron microscopy. Large untransformed grains are seen to contain high densities of nanometer dimension, round or oval, textural features. Examination at high magnification shows these to be clusters of dislocation loops, which are concentrated towards grain centers. The loops occur most commonly in grains of materials with a high ... |
|
| Oxidation of Silicon Powder: Its Significance for the Strength of Reaction Bonded Silicon Nitride. |
1993 |
|
| Authors:
R. G. Stephen; F. L. Riley; LEEDS UNIV (UNITED KINGDOM)
|
| Silicon powder is readily oxidized by water of pH > 7 with formation of thin surface coatings of silicon dioxide. At high pH the rate of reaction is fast: for example gentle agitation at 21 C with grinding media in water of pH 10 for 14 ks is sufficient to convert 7% of 8 micron silicon powder to silicon dioxide. Agitation in propan-2-ol (IPA) has no detectable effect. The coating ... |
|
| Residual Stress and Microcracking in SiC-MgO Composites. |
1993 |
|
| Authors:
J. Luo; R. Stevens; LEEDS UNIV (UNITED KINGDOM)
|
| The level of residual stress in SiC-particle-reinforced MgO composites has been investigated using X-ray diffraction. The significant difference in thermal expansion coefficients between SiC and MgO has resulted in the high residual stress in the composites. The stress measured has been compared with the calculated value evaluated using a Modified Eshelby's Model. Good agreement was obtained at low volume fractions of SiC addition to the MgO. At high volume fractions ... |
|
| The Intergranular Stress Corrosion Cracking of Ti 155 in Methanol/HCl at Room Temperature. |
1993 |
|
| Authors:
D. J. Simbi; J. C. Scully; LEEDS UNIV (UNITED KINGDOM)
|
| The stress corrosion cracking behavior of Ti-155 in methanol-HCl solution was investigated at room temperature. Three zone fractures were observed consisting of intergranular fracture, a transgranular cleavage and ductile region. The depth of the intergranular fracture zone was determined and compared with those obtained from pre-exposure tests. |
|
| Superplasticity and Post-Forming Room Temperature Tensile Properties of Ti-2.5%Cu Alloy. |
1993 |
|
| Authors:
M. A. Hassan; C. Hammond; LEEDS UNIV (UNITED KINGDOM)
|
| This paper investigates superplastic deformation in the temperature range 775-890 C and room temperature tensile properties of Ti-2.5Cu alloy. Elongation, strain hardening, and strain rate sensitivity were evaluated. Results of room temperature tensile properties indicate reductions in strength and ductility for the superplastically deformed material. |
|
| The Relation Between Filament Diameter and Fracture Strength for Ultra-High-Modulus Polyethylene Fibres. |
1993 |
|
| Authors:
T. Amornsakchai; D. L. M. Cansfield; S. A. Jawad; G. Pollard; I. M. Ward; LEEDS UNIV (UNITED KINGDOM)
|
| The effect of filament diameter on the failure stress of polyethylene fibers has been studied using weibull analysis. both gel-spun and melt-spun fibers have been examined, so that differences might be observed for changes in draw ratio or modulus as well as molecular weight. it is concluded that the strength of high-modulus melt-spun fibers relates to the concentration of flaws and is significantly dependent on filament diameter conflicting results for ... |
|
| Bounds for the Elastic Constants of a Unidirectional Fibre Composite: A New Approach. |
1993 |
|
| Authors:
I. M. Ward; A. P. Wilczynski; LEEDS UNIV (UNITED KINGDOM)
|
| Series-parallel and parallel-series models are used to calculate upper and lower bounds for a unidirectional fiber composite. it is shown that this simple approach produces comparatively close bounds which agree well with those calculated from more sophisticated analytical methods. this approach may be used for initial estimates of composite properties, e.g. when characterizing a new material. in some cases this may be sufficient for the design of simple composite structures., ... |
|
| The Ultraviolet Sensitivity of Kevlar 149 and Technora Fibres. |
1993 |
|
| Authors:
M. G. Dobb; R. M. Robson; A. H. Roberts; LEEDS UNIV (UNITED KINGDOM)
|
| The effect of ultraviolet radiation on the tensile properties of two engineering fibres, namely Kevlar 149 and Technora, is reported. Both fibre types show considerable loss in strength, but the former also exhibits a significant and unexpected fall in modulus. Electron microscope examination of the virgin and extended fibres revealed the structural reasons for the observed mechanical behaviour. |
|
| Study of the Oxygen Treatment of High-Modulus Polyethylene Fibers. |
1993 |
|
| Authors:
D. W. Woods; I. M. Ward; LEEDS UNIV (UNITED KINGDOM)
|
| It has been found that three possible mechanisms can contribute to the improvements in fibre/resin adhesion when high-modulus polyethylene fibres are subjected to oxygen gas plasma treatment. These mechanisms are surface oxidation, cross-linking and surface etching. In this paper it is attempted to estimate the relative importance of these three mechanisms in the improvement of the interlaminar shear strength (ILSS) of polyethylene fibre/expoxy resin composites. From a comparison of plasma ... |
|
| The Relation Between Filament Diameter and Fracture Strength for Ultra-High-Modulus Polyethylene Fibres. |
1993 |
|
| Authors:
T. Amornsakchai; D. L. M. Cansfield; S. A. Jawad; G. Pollard; I. M. Ward; LEEDS UNIV (UNITED KINGDOM)
|
| The effect of filament diameter on the failure stress of polyethylene fibers has been studied using Weibull analysis. Both gel-spun and melt-spun fibers have been examined, so that differences might be observed for changes in draw ratio or modulus as well as molecular weight. It is concluded that the strength of the high- modulus melt-spun fibers relates to the concentration of flaws and is significantly dependent on filament diameter. Conflicting ... |
|
| Importance of Interfaces in Aluminium and Magnesium Alloy Metal Matrix Composites Reinforced With SiC Particles |
92 |
|
| Authors:
B. Inem; N. Han; G. Pollard; R. Stevens; LEEDS UNIV (UNITED KINGDOM)
|
| Cast aluminium and magnesium alloys reinforced with sic particles have been examined metallographically. the interfaces between the alloy and particles are essentially featureless and free of reaction products. some segregation of solute occurs and can lead to preferential nucleation of solidifying phases. the differential thermal expansion produces dense dislocation tangles and leads to recrystallization in the case of the magnesium alloy. there is some microcracking at interfaces and these cracks ... |
|
| Phase Composition and Properties of Plasma-Sprayed Zirconia Thermal Barrier Coatings |
92 |
|
| Authors:
P. D. Harmsworth; R. Stevens; LEEDS UNIV (UNITED KINGDOM)
|
| The use of X-ray diffraction combined with TEM analysis has been used to study the crystalline structure and change in phase composition of zirconia coatings containing 6-12 wt% Y2O3. The optimum composition for maximum durability, observed for coatings within this composition range, is believed to be related to the microstructure developed on rapid cooling and to the volume fractions of t', c and m phases formed during the evolution of ... |
|
| Microstructure of Zirconia-Yttria Plasma-Sprayed Thermal Barrier Coatings |
92 |
|
| Authors:
P. D. Harmsworth; R. Stevens; LEEDS UNIV (UNITED KINGDOM)
|
| The objective of this paper is to report on the characterization of the highly complex microstructure of zirconia coatings, which arise as a result of the plasma-spraying process. The fine structure has been observed to change through the thickness of the coating, behavior which has been related to the cooling rate and crystallization of the deposited material. Microstructural features such as an amorphous bond coat/ceramic interfacial film and a grain- ... |
|
| StatLog: An Evaluation of Machine Learning and Statistical Algorithms, |
1992 |
|
| Authors:
Charles C. Taylor; LEEDS UNIV (UNITED KINGDOM)
|
| StatLog is a European Community (ESPRIT) funded project which began in October 1990. There are about 10 academic and industrial partners involved in the project. Its aim is to complete an evaluation of the performance of Machine Learning and Statistical Algorithms on large-scale, complex commercial and industrial problems. The objectives of the project are threefold: (1). to provide critical performance measurements, and criteria for measurement on available Learning Algorithms which ... |
|
| Statistical Shape Models in Image Analysis, |
1992 |
|
| Authors:
K. V. Mardia; J. T. Kent; A. N. Walder n; LEEDS UNIV (UNITED KINGDOM)
|
| We discuss several models for shapes in the plane based on the distributions of landmarks about an underlying template. The motivation for these models includes Markov random fields and thin plate splines. These models are used as priors in a Bayesian framework to reconstruct a shape from a digital image. An example is given based on the human hand |
|
| Structure-Compressional Property Relationships in Carbon Fibers. |
1992 |
|
| Authors:
D. J. Johnson; C. R. Park; LEEDS UNIV (UNITED KINGDOM)
|
| In an earlier paper, we reported compressive strengths for various carbon fibers as estimated by the recoil test, and showed a decrease in compressive strength with increasing tensile modulus for mesophase pitch (MP)-based fibers. Scanning Electron Microscope (SEM) observations revealed that polyacrylonitrile (PAN)-based carbon fibers and low-modulus (MP)-based carbon fibers fail by a buckling mechanism, and that high-modulus MP-based carbon fibers fail by shear. We have suggested that the presence ... |
|
| Role of Microvoids in Aramid Fibres. |
1992 |
|
| Authors:
M. G. Dobb; C. R. Park; R. M. Robson; LEEDS UNIV (UNITED KINGDOM)
|
| The distribution of microvoids in high-strength aramid fibre has been established. the tensile and compressive behaviours of both untreated and silver sulphide-impregnated kevlar 981 fibre are reported and the results are discussed in terms of the influence of microvoids on the mechanical performance. keywords:, composite materials, experimental reinforcement data, aramid fibers, fibers, kevlar 981 fibers, kevlar fibers, breaking strain data, breaking strains, breaking strength, breaking strength data, fiber data, modulus ... |
|
| THE CHEMICAL DISARMAMENT POLICY OF THE BUSH ADMINISTRATION. |
1992 |
|
| Authors:
EDWARD SPIERS; LEEDS UNIV (UNITED KINGDOM)
|
| THE AUTHOR BELIEVES THAT WORKING PAPER 352, PRESENTED BY PRESIDENT BUSH, DOES NOT GO FAR ENOUGH. THE ARTICLE STATES THAT IF A CHEMICAL TREATY IS SIGNED IN 1992, IT WILL NOT BE A PANACEA. THE AUTHOR DOES NOT FEEL THAT A TREATY WILL SOLVE ANY OF THE PROBLEMS BUT WILL ADD TO THE EFFORTS OF MONITORING. |
|
| Elastic Anisotropy in Unidirectional Fibre Reinforced Composites. |
1992 |
|
| Authors:
S. R. A. Dyer; D. Lord; I. J. Hutchinsons; I. M. Ward; R. A. Duckett; LEEDS UNIV (UNITED KINGDOM)
|
| THEORY, BOUNDS ON THE ELASTIC CONSTANTS, UNIDIRECTIONAL FIBRE REINFORCED COMPOSITES, TRANSVERSE ISOTROPY, Brody and Ward, elastic constants, ultrasonic immersion technique, epoxy resin, glass fibres, ultrahigh modulus, polyethylene fibres, polyetheretherketone, carbon fibres, APC2 |
|
| Microstructure and Properties of SiC Whisker Reinforced Ceramic Composites |
91 |
|
| Authors:
M. Yang; R. Stevens; LEEDS UNIV (UNITED KINGDOM)
|
| Microstructures of SiC whisker reinforced alumina and tetragonal zirconia polycrystals (TZP) were investigated using analytical electron microscopy. In the Al2O3-SiC system, amorphous phases between the whisker and matrix were observed; these amorphous phases were virtually eliminated when the whiskers were leached with HF acid before being incorporated into the matrix. In the TZP/SiC system, reaction between the whisker and matrix had taken place during fabrication and resulted in the formation ... |
|
| Wet Abrasive Wear of Advanced Technical Ceramics |
91 |
|
| Authors:
M. Miranda-Martinez; F. L. Riley; LEEDS UNIV (UNITED KINGDOM)
|
| A simple wet abrasive wear test has been developed to allow a comparative evaluation to be made of materials' behavior. Studies of wear behavior tend broadly to follow two experimental approaches typified by the use of the pin-on-disc, cylinder or plate methods, giving information about particulate impact wear. Many practical situations, those involving relatively low velocity slurries for example, do not correspond precisely to either of these test conditions. In ... |
|
| Silicon Nitride Oxidation/Re-oxidation |
91 |
|
| Authors:
P. Andrews; F. L. Riley; LEEDS UNIV (UNITED KINGDOM)
|
|
| Effect of Zirconia Additions on the Reaction Sintering of Aluminium Titanate |
91 |
|
| Authors:
H. A. J. Thomas; R. Stevens; E. Gilbart; LEEDS UNIV (UNITED KINGDOM)
|
| Yttria-stabilized zirconia was added to a chemically prepared mixture of alumina and titania. The effect of the zirconia on the microstructure and resultant properties was studied following reaction sintering to form aluminum titanate. An increase in mechanical strength was observed with little effect on the excellent thermal properties of the aluminum titanate. This was attributed to generation of extra microcracks by the transformation of the zirconia phase and the unusual ... |
|
| Microstructure and Phase Composition of ZrO2-CeO2 Thermal Barrier Coatings |
91 |
|
| Authors:
P. D. Harmsworth; R. Stevens; LEEDS UNIV (UNITED KINGDOM)
|
| The microstructure and phase composition of zirconia plasma-sprayed thermal barrier coatings containing 12 to 25 wt% ceria addition have been investigated. Coatings containing less than 20 wt% CeO2 are composed of a monoclinic and retained metastable transformable tetragonal phase due to the constraint developed by the small crystal size. This phase transforms readily under moderate thermal stresses. Compositions greater than 20 wt% CeO2 are composed only of a metastable non-transformable ... |
|
| Deformation and Recrystallisation of Steels |
90 |
|
| Authors:
T. Gladman; LEEDS UNIV (UNITED KINGDOM)
|
| Over the past 30 years, many important developments in steel products and steel manufacturing processes have affected cold rolled and annealed strip products; use of microalloyed steels in cold rolled and annealed gauges has improved understanding of the role of second phase particles on deformation and recrystallization behavior; dual phase steel's enhanced work hardening rates and improved resistance to plastic instability have also influenced sheet metal products; improved steel making ... |
|
| Compressional Behaviour of Carbon Fibres |
90 |
|
| Authors:
M. G. Dobb; D. J. Johnson; C. R. Park; LEEDS UNIV (UNITED KINGDOM)
|
| The compressional behaviour of polyacrylonitrile (PAN)-based and mesophase-pitch (MP)-based carbon fibres has been studied by means of a single- fibre-recoil test method followed by scanning electron microscope (SEM) examination. PAN-based carbon fibres have relatively high compressive strengths compared with MP-based carbon fibres. The improved tensile and compressive strengths of some recent PAN-based fibres are discussed in terms of a two-phase structure; one phase is the normal layer-plane structure, the other ... |
|
| Assessment Method for the Sinterability of Matrices in Ceramic Composites |
90 |
|
| Authors:
W. H. Tuan; R. J. Brook; LEEDS UNIV (UNITED KINGDOM)
|
| A technique is developed to rank the creep viscosity of various matrices in ceramic composites. Large spherical pores are introduced deliberately into the matrices, and a small load applied to the compacts during sintering. The spherical pores are deformed to ellipsoids by the uniaxial stress. The extent of the deformation of the pore is used to estimate the creep viscosity of the matrices. When taken in combination with densification data ... |
|
| Zirconia Toughened Cordierite |
90 |
|
| Authors:
I. Wadsworth; J. Wang; R. Stevens; LEEDS UNIV (UNITED KINGDOM)
|
| Zirconia-cordierite ceramic composites were fabricated by the hot pressing of cordierite and zirconia powders at 1400C/20 MPa for 10 min. Both the fracture toughness and fracture strength have been enhanced by the addition of zirconia. Such improvements are due to stress-induced transformation toughening and to the generation of residual stresses. Microcrack toughening has been found not to occur in the composite as a consequence of the large thermal expansion mismatch. ... |
|
| Structure and Properties of Carbon Fibres. |
1990 |
|
| Authors:
D. J. Johnson; LEEDS UNIV (UNITED KINGDOM)
|
| This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: basic topics:, composite materials, data, reinforcement data materials and material types:, c fibers, c matrix, c/c, fibers, m40 fibers, m50j films, t1000 films, t300 fibers material characteristics and data fields:, chemical inertness, compressive properties, creep resistance, cte, electrical conductivity, failure strain data, fatigue resistance, interlaminar shear strength, modulus data, physical properties, shear deformations, ... |
|
| COMPRESSIONAL BEHAVIOUR OF CARBON FIBERS. |
1990 |
|
| Authors:
M. G. Dobb; D. J. Johnson; C. R. Park; LEEDS UNIV (UNITED KINGDOM)
|
| The compressional behaviour of polyacrylonitrile (PAN)-based and mesophase-pitch (MP)-based carbon fibres has been studied by means of a single-fibre-recoil test method followed by scanning electron microscope (SEM) examination. PAN-based carbon fibres have relatively high compressive strengths compared with MP-based carbon fibres. The improved tensile and compressive strengths of some recent PAN-based fibres are discussed in terms of a two-phase structure; one phase is the normal layer-plane structure, the other phase ... |
|
Reports by Corporate Author
