Superconductivity Centennial Conference 2011- EUCAS–ISEC–ICMC (18-23 Sep 2011, The Hague, The Netherlands)

The purpose of the present study was to test the theoretical relationship of the concepts of informational support and threat appraisal with a sample of surgical cardiac patients twenty-four hours after discharge from the hospital. These discharged patients were adjusting to the transition of hospital to home environment while still recovering from a life threatening illness. They may need varying informational supports to reduce their threat perception of the magnitude of the illness. A convenience sample of thirty-six surgical cardiac patients was assigned to three groups. The groups received the standard discharge preparation as stated by the hospitals' policy and procedure manual. The experimental group received a supportive and informational telephone call approximately twenty-four hours after discharge. The second group was the placebo group, these participants were given a telephone call at the end of the twenty-four hours to remind them to return the questionnaire. The third group was the control group, received no telephone call and were instructed to complete the questionnaire at the specified time. All groups were instructed at the time of initial contact to complete the questionnaire at approximately the end of the first twenty-four hours after discharge. The placebo group and control group were then pooled for data analysis due to the low return rate of the two groups. The two groups were compared with a t-test. The demographic data compared age and educational level to the perceived level of threat. Reliability of the tool was determined using a Cronbach's Alpha. / School of Nursing

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Aim: The aim of this study was to develop a targeted health information package for women to use specifically as a reference during their return to health following a hysterectomy and to subsequently test its usefulness. Method: A quasi-experimental design measured the effectiveness of this package in improving the health and satisfaction outcomes of women compared to those who received the standard information. Women undergoing a hysterectomy for benign reasons who were between the ages of 20 and 60 years were included. There were 55 participants recruited into the control group and 44 into the intervention group. Participants completed a self-administered questionnaire both prior to and 14-16 weeks post-surgery. Results: The study found that there were no statistically significant differences between the two groups for their self-reported health, the time taken to return to usual activities and the number of symptoms experienced after surgery. Clinical improvements, however, were noted in the intervention group. A statistically significant difference was found between the groups for the amount written information that they would have preferred for their recovery (X2 8.26 df2 p=0.011). Ninety percent (90%) of the women who received the intervention wanted the same amount of written information to take home whilst 40% of the control group would have preferred more written information. This indicated a positive effect from the intervention. An unexpected finding in this study was that almost 40% of both groups wanted more verbal information and discussion prior to discharge. Conclusion: A valuable aspect of this study was its usefulness in identifying the clinical importance of discussion as part of the discharge process. These findings will be important for health professionals to utilise in their clinical practice for women undergoing a hysterectomy.

The insulation lifetime of power cables is determined by several factors. One of the most important of these is the occurrence of partial discharge (PD) at the dielectric. The ability to detect and locate a PD source is limited by attenuation of the high frequency PD pulses as they propagate through the cable to the sensor. Therefore it is necessary to understand the high frequency response of such cables. The ultimate aim of this thesis is to develop an accurate frequency-dependent cable model for detecting and locating degraded insulation regions on power cables, caused by partial discharge activities. Numerical methods can calculate field distribution in the vicinity of a cavity of non-standard shape which generates PDs, and is difficult to calculate by analytical methods. The simulated results show the important influence of the shape of cavity on the electric stress within it. The cavity stress enhancement increases as the permittivity of the dielectric increases. The increase is greater for cavities with large diameter to thickness ratios. A cavity with its axis parallel to the applied field direction has a higher stress enhancement. In addition the stress distribution in the cavity is smaller for spherical cavities than for cylindrical types. The research results show that the semi-conducting layers response voltage increases as frequency increases. This indicates that the semi-conducting layers can have high sensitivity for detection of partial discharge signals and this may be a useful feature to incorporate in the design of cables and in the application of cable models. By using ATPDraw, FEM and EMTP-RV techniques, three different types of cable models are developed. The simulated results give a good agreement with the measured results on the single and three phase power cable. The developed cable model can use for reconstruction of PD source signal by using the receiving signal captured at the cable ends. It is important to use the true pulse shape because it is characteristic of the PD type and location. An investigation into the possibility of detecting different PD patterns and signals when conducting PD tests using different sensor bandwidths is also presented in this thesis. The occurrence of discharge activity was created by an artificial defect manufactured in the single core cable insulation. The artificial defect generated internal discharge and was used to investigate the PD signal propagation on cross-linked polyethylene (XLPE) cable. Capacitance coupled external sensors have been applied for the PD detection measurements and the results show that these external sensors have a number of advantages compared to high frequency current transformer (HF-CT) sensors for the detection of PD pulses. In addition, development of a method to detect cross-coupling of PD signals between phases of a three core cable and location of the PD source on the three phase cable. In order to visualize recorded data gained by PD measurement of three phase cable under test, the 3PARD diagram was used. Each data pulse is assigned to a single dot in the (scatter plot) diagram. The measured results show that the 3PARD diagram allowed the user to identify the fault between phases with PD location. The model used for reconstruction which includes the effect of semicon material in the losses provides accurate reproduction of the propagation characteristics of high frequency PD pulses and the thesis work had used such a model to reconstruct PD waveforms of site PDs from the measured signal for the first time. The use of the original waveform is important for PD identification and location in the practical situation.

Thesis (Ph. D.)--University of Missouri-Columbia, 2007. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Vita. "August 2007" Includes bibliographical references.

Thesis (M.S.)--University of Michigan, 1986.

Thesis (M.S.)--University of Michigan, 1985.

Thesis (M.S.)--University of Michigan, 1972.

Thesis (M.S.)--University of Michigan, 1986.