1,722,291 research outputs found
A study of flat-bed knitting technology for three-dimensional preforms
No full textTo enable shaped preforms to be produced accurately, it is essential to have a full understanding of the geometrical properties of the structure and the effects that the various shaping techniques produce. This publication discusses the technique of three-dimensional shaping and its affects on the geometrical dimensions of a hemispherical form.
In the paper the calculation procedures employed to produce a knitted hemisphere shape are defined and relationships are established between the planar structure and the three-dimensional preform. The first part of the study demonstrates three-dimensional shaping with conventional knitting yarns. However, it was acknowledged that technical textiles employ high or low modulus yarns (performance yarns) to enable the desired properties of the structure to be achieved. Therefore, in the second part the use of technical yarns in creating three-dimensional knitted structures is reported.
The results demonstrate that an interesting phenomenon was occurring involving distortions within the knitted structure. Further research is currently being undertaken to prove the theory that the internal distortions that occur as part of the shaping process are predictable and exact shapes can be produced. This will lead to the modelling of the hypothesis for a variety of structure types
Evolution of the Drift Waves in the Umist Linear system
Full text linkEvolution of the Drift Waves in the Umist Linear syste
Experimental investigation into the propagation of partial discharge pulses in transformers
Full text linkAn experimental investigation into the propagation behaviour of partial discharge (PD) pulses in a continuous disc type 6.6kV transformer winding is described in this paper. PD pulses were injected into the winding using a calibrator and the resulting current signals at the line and neutral end terminals measured using wide band current transformers. The location of the troughs (or zeros) in the frequency spectra of the measured signals change in accordance with the position of the injected pulse. The crests (or poles) in the spectra convey information about the resonance frequencies of the winding and are not affected by the position of the injected pulse. The measured spectra are compared with the spectra generated by a simulation model and although differences exist the overall shape and location of the poles and zeros are similar
Average accuracies versus different reduced dimensionalities on UMIST dataset.
No full text<p>Average accuracies versus reduced dimensionalities when (A) 4, (B) 6, (C) 8, and (D) 10 images of each individuals of UMIST dataset are selected for training.</p
An example of images from UMIST Face Database with random block occlusions ().
No full text<p>An example of images from UMIST Face Database with random block occlusions ().</p
Recognition rates on UMIST Face Database with different level of block occlusions.
No full text<p>Recognition rates on UMIST Face Database with different level of block occlusions.</p
Numerical computation of turbulent flow in rotating disc cavities
No full textThesis submitted to UMIST for M.Sc degreeAvailable from British Library Document Supply Centre- DSC:9113.125(UMIST-TFD--89/4) / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
The UMIST database for astrochemistry 1995
No full textWe report the release of a new version of the UMIST database for astrochemistry. The database contains the rate coefficients of 3864 gas-phase reactions important in interstellar and circumstellar chemistry and involves 395 species and 12 elements. The previous (1990) version of this database has been widely used by modellers. In addition to the rate coefficients, we also tabulate permanent electric dipole moments of the neutral species and heats of formation. A numerical model of the chemical evolution of a dark cloud is calculated and important differences to that calculated with the previous database noted
The computation of turbulent thin shear flows associated with flow around multi-element aerofoils
No full textThesis submitted to UMIST for Ph.D. degreeAvailable from British Library Document Supply Centre- DSC:9113.125(UMIST-TFD--88/7) / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
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