| Feasibility and User Acceptance of a Personal Weight Management System Based on Ubiquitous Computing |
25 OCT 2001 |
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| Authors:
M. VAN Gils; J. Parkka; R. Lappalainen; A. Ahonen; A. Maukonen; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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 | With the fast development of information and communications technology, devices with some computing power are becoming increasingly abundant in the average home, The trend for these devices to also be provided with intercommunication functionality opens up new possibilities for health care, The availability of ubiquitous computing allows the individual to perform health- related measurements, review data or consult guidelines independent of place or time, thus providing the individual with a ... |
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| The In-Situ Fracture and Auger Analysis of Nicalon Fibers. |
1994 |
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| Authors:
D. N. Braski; M. C. Osborne; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| A technique has been developed to fracture irradiated Nicalon fibers in a Scanning Auger Microprobe (SAM) and analyze the fracture surfaces without contaminating the specimen chamber. The technique, which was evaluated using as-received fibers, requires only minor modification of two standard specimen holders and should be applicable to other fibers or materials that can be broken under low loads in bending. The technique is simple, rapid, reduces specimen charging, and ... |
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| Fully Reversed Bending Fatigue of Si3N4/SiCw and Si3N4 in Different Environments. |
1994 |
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| Authors:
T. A. Mantyla; P. T. Vuorinen; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| The fatigue of silicon nitride and silicon carbide whisker reinforced silicon nitride (10 vol% of SiC(w)) was studied in three different environments; in water, in air, and in non-aqueous liquid, cyclohexane. Testing was made with natural flaw distribution. Fatigue mode was sinusoidal fully reversed bending tension-compression with R=-1. These materials showed high fatigue resistance and no clear cyclic fatigue effects could be found, especially in non-aqueous environment. The fatigue of ... |
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| High-Temperature Low-Cycle Fatigue Behavior of Superalloy MA 760. |
1993 |
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| Authors:
A. Hynna; V. T. Kuokkala; J. Laurila; P. Kettunen; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| The high-temperature cyclic behavior of oxide dispersion-strengthened superalloy MA 760 was studied at different temperatures and specimen orientations. The cyclic hardening curves at different strain amplitudes were determined at 650, 900, and 950 C, and the stress-strain response of the material was substantiated by detailed fractographical scanning electron microscopy (SEM) and microstructural/ optical microscopy, STEM observations. During cycling, MA 760 did not exhibit marked hardening or softening, and also the ... |
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| High-Temperature Low-Cycle Fatigue Behavior of Superalloy MA 760. |
1993 |
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| Authors:
A. Hynna; V. T. Kuokkala; J. Laurila; P. Kettunen; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| The high-temperature cyclic behavior of oxide dispersion-strengthened superalloy MA 760 was studied at different temperatures and specimen orientations. The cyclic hardening curves at different strain amplitudes were determined at 650, 900, and 950 C, and the stress-strain response of the material was substantiated by detailed fractographical scanning electron microscopy (SEM) and microstructural/ optical microscopy, STEM observations. During cycling, MA 760 did not exhibit marked hardening or softening, and also the ... |
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| High-Temperature Low-Cycle Fatigue Behavior of Superalloy MA 760. |
1993 |
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| Authors:
A. Hynna; V. T. Kuokkala; J. Laurila; P. Kettunen; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: basic topics:, mmc data, composite materials, data, experimental materials and material types:, alloys, ma 760 matrix, mg matrix material characteristics and data fields:, fatigue behaviors, ods, plastic strains, strain data, stress data, superalloy data testing and test conditions:, fatigue tests, high temperatures, low cycle fatigue tests, sem, stem, tem miscellaneous and special technical ... |
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| Friction and Wear Performance of Detonation-Gun- and Plasma-Sprayed Ceramic and Cermet Hard Coatings Under Dry Friction. |
1993 |
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| Authors:
Yinglong Wang; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: basic topics:, cmc, data, experimental, mmc, mmc data, reinforcement data materials and material types:, cermets, d-gun coatings, mocn315 matrix, plasma spray coatings, powders material characteristics and data fields:, coating hardness, friction data, hardness data, roughness data, vicker hardness data, wear data, testing and test conditions:, eds, friction tests, hardness tests, sem, wear tests ... |
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| VISAC--ACTIVATED CARBON FIBRES IN COMPOSITES FOR CHEMICALLY PROTECTIVE CLOTHING. |
08 JUN 1992 |
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| Authors:
OY FINALYSON; M. NIEMINEN; P. NOUSIAINEN; A. VUORI; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| NBC PROTECTIVE SUITS WERE MANUFACTURED FROM SELECTED WOVEN, KNITTED, AND ACTIVATED-CARBON FIBER FABRICS. THE ACTIVATED CARBON FIBER FABRIC USED WAS VISAC. THE SUITS WERE TESTED FOR CHEMICAL PROTECTION AS WELL AS CLOTHING COMFORT AND MECHANICAL PROPERTIES. THE VISAC SUITS HAD EXCELLENT RESULTS FOR ALL THREE TESTS. |
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| Formation and Characteristics of Co75Ti25-Alloy Produced by Mechanical Alloying |
92 |
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| Authors:
J. E. Vuorinen; T. J. Tiainen; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| Cobalt-titanium alloy with the composition Co75Ti25 (corresponding to the intermetallic compound Co3Ti was prepared by mechanically alloying a mixture of pure elemental powders under inert gas atmosphere. For alloying, three different mill types (shaker mill, planetary mill and attritor mill) were used. Resulting powders were characterized with X-ray diffraction, scanning electron microscopy, particle size distribution measurements and differential thermal analysis. Mechanical alloying resulted in the formation of an amorphous alloy ... |
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| High Temperature Low Cycle Fatigue Behavior of Superalloy MA 760 |
92 |
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| Authors:
A. Hynna; V. T. Kuokkala; J. Laurila; P. Kettunen; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| Low cycle fatigue behavior of Y2O3 strengthened MA 760 nickel superalloy has been investigated from 650-950 C for different specimen orientations. Results show that fatigue failure occurred without any noticeable decrease in the cyclic strength of the alloy. Most of the failure surface exhibit a brittle appearance. Oxidation induced secondary cracking along grain boundaries was also evident. |
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| Corrosion Fatigue of Low Pressure Steam Turbine Blade Materials |
1992 |
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| Authors:
J. Peltonen; P. Siitonen; P. O. Kettunen; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: experimental materials and material types: aisi 403, ph 13-8 mo steel, x20crmov12 1 materials related terms: chromium addition, corrosion fatigue, corrosion resistance, elongation, endurance limit, erosion, fatigue strength, pitting corrosion, reduction of area, tensile strength, tensile yield strength, vickers hardness testing and test conditions: electrochemical polarization experiment, processing: electroslag remelting miscellaneous ... |
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| Experimental Design and Parameter Optimization for Plasma Spraying of Alumina Coatings |
92 |
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| Authors:
S. L. Chen; P. Siitonen; P. Kettunen; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| Orthogonal block design, regression analysis, and optimization of spraying variables (ORO) is applied to achieve a quantitative and optimized prediction of the structure or properties of plasma sprayed alumina coatings. The orthogonal block design was used to arrange the experiments and to reduce their number. The received structure or property is a function of the selected variables, but additionally also of the interactions between them. Applying regression analysis, direct relations ... |
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| European Conference on Molecular Beam Epitaxy and Related Growth Methods (6th) Held in Tampere, Finland on 21-14 April 1991 |
24 APR 91 |
260 pages |
| Authors:
TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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 | Topics covered during this symposium includes: (1) Local growth of silicon MBE layers; (2) Doping during growth; (3) Electrical characterisation for silicon; (4) Design and performance of multiwafer MBE system used in HEMT production; (5) Indium free mounting technique retrofit to a 2 inch in bonded wafer substrate holder; (6) Structure, properties, and purity of pyrolytic boron nitride crucibles; (7) The temperature dependence of the critical layer thickness in in0.36 ... |
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| Small-angle Neutron Scattering from Fatigued Copper Single Crystals |
91 |
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| Authors:
T. K. Lepisto; G. Kostorz; V. T. Kuokkala; P. Kettunen; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| Copper single crystals oriented for single and multiple slip were studied by small-angle neutron scattering (SANS) after fatigue tests at a constant plastic shear strain amplitude =0.15%; for the SANS measurements, a special sample holder was used in order to obtain more reliable information about the small differences in the neutron scattering from individual samples; the size of the voids in the samples oriented for single slip increased as a ... |
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| Modeling Porous Glass Wool Composite Strength |
90 |
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| Authors:
Pentti Jaervelae; Timo Pohjonen; Pertti Toermaelae; Pirkko Jaevelae; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| Fabrication and Properties of Alumina-Zirconia Composites |
88 |
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| Authors:
T. Rytkoenen; K. Keskinen; P. Lintula; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| The mixing homogeneity of alumina-zirconia composites was studied in the composition range alumina = 0, 20, 40, 60, 80 and 100 vol.-%. Shrinkage behavior of the uniaxially pressed composites was followed by an optical dilatometer. Results revealed that the pure end-members densified faster to full density and the addition of the other end-member impaired the densification. Scanning electron microscopy showed that the dispersion homogeneity of these composites was good and ... |
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| Vapour Deposited TiN and TiC Diffusion Barriers |
86 |
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| Authors:
A. K. Telama; K. T. Torkkell; T. A. Mantyla; P. O. Kettunen; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| Diffusion barrier coatings of TiC and TiN were deposited between Co- Ni-Cr-Al-Y-Ta and MA6000 and Fe-Cr-Al-Y and Incoloy 800 by reactive sputtering and chemical vapor deposition. After diffusion annealing in argon at 1000 to 1100 C for from 50 to 100 hours, sputtered TiN coatings proved the most effective diffusion barrier between the superalloys and the MCrAlY layers. |
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| High Temperature Low Cycle Fatigue Properties of Superalloy MA 6000 |
86 |
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| Authors:
A. Hynna; V.-t. Kuokkala; T. Lepisto; T. Mantyla; P. Kettunen; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| Three low cycle fatigue (LCF) tests were conducted on MA6000 at 850 C and a strain rate of 0.001/s. The five LCF tests at 1050 C were at a strain rate of 0.00002/s. The cyclic hardening curves are shown for each temperature as are Coffin-Manson plots. Essentially no hardening or softening is present during cycling to final fracture. There were no drastic changes in microstructure during fatigue revealed by TEM. ... |
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| Erosion and Corrosion Resistance of Materials for Fluidized Bed Combustors |
86 |
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| Authors:
T. Tiainen; P. Siitonen; P. Kettunen; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| Erosion and corrosion resistance tests were conducted on candidate fluidized bed combustor materials and coatings at 900 C. The laboratory scale experiments varied the sulfur dioxide in the oxidizing atmosphere from 0 to 3000 ppm and used the impact angles of 60 and 90 degrees. Weight gain and loss observations are given for the full scale tests for up to 1500 hours. |
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| Multicriterion Optimization in Structural Design, |
1981 |
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| Authors:
Juhani Koski; TAMPERE UNIV OF TECHNOLOGY (FINLAND)
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| A general philosophy of the multicriterion approach is presented, and Pareto optima are defined as solutions to the problem. A structural design problem where the weight and some chosen nodal displacements of the structure are taken as design criteria is formulated for hyperstatic trusses and plane frames. The displacement method is applied, and limits for the stresses as well as for the member areas are imposed. Only elastic structures with ... |
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