Probabilistic Analysis of Power Network Susceptibility to GICs

As reliance on power networks has increased over the last century, the risk of damage from geomagnetically induced currents (GICs) has become a concern to utilities. The current state of the art in GIC modelling requires significant geophysical modelling and a theoretically derived network response, but has limited empirical validation. In this work, we introduce a probabilistic engineering step between the measured geomagnetic field and GICs, without needing data about the power system topology or the ground conductivity profiles. The resulting empirical ensembles are used to analyse the TVA network (south-eastern USA) in terms of peak and cumulative exposure to 5 moderate to intense geomagnetic storms. Multiple nodes are ranked according to susceptibility and the measured response of the total TVA network is further calibrated to existing extreme value models. The probabilistic engineering step presented can complement present approaches, being particularly useful for risk assessment of existing transformers and power systems.Comment: 6 pages, 7 figures, accepted for PMAPS 202

Moral distress among critical care nurses when excecuting do-not-resuscitate (DNR) orders in a public critical care unit in Gauteng

Background. A critical care unit admits on a daily basis patients who are critically ill or injured. The condition of these patients’ may deteriorate to a point where the medical practitioner may prescribe or decide on a ‘do not resuscitate’ (DNR) order which must be executed by a professional nurse, leading to moral distress which may manifest as poor teamwork, depression or absenteeism. Objective. To explore and describe factors contributing to moral distress of critical care nurses executing DNR orders. Design. The explorative descriptive qualitative design was selected to answer the research questions posed. Methods. Critical care nurses of a selected public hospital in Gauteng Province were selected via purposive sampling to participate in the study, and data were collected through semi-structured interviews. Participants. A shift leader assisted with selection of participants who met the eligibility criteria. The mean age of the participants was 36 years; most of them had more than five years’ critical care nursing experience. Twelve critical care nurses were interviewed when data saturation was reached. Thereafter two more interviews were conducted to confirm data saturation. A total of 14 interviews were conducted. Results. Tesch’s eight-step method was utilised for data analysis. The findings were classified under three main themes: moral distress, communication of DNR orders and unavailability of psychological support for nurses. Conclusion. The findings revealed that execution of DNR orders is a contributory factor for moral distress in critical care nurses. National guidelines and/or legal frameworks are required to regulate processes pertaining to the execution of DNR orders. The study further demonstrated the need for unit-based ethical platforms and debriefing sessions for critical care nurses

Factors influencing academic performance in biological sciences among students in a nursing education institution in the Eastern Cape Province : an appreciative inquiry approach

Nursing education institutions are responsible for quality education and training and are professionally accountable for nursing programmes of high academic standards. The majority of first and second year nursing students following the comprehensive four year nursing programme at a specific nursing education institution were academically unsuccessful in the subject biological science. The aim of the study was to explore and describe the factors influencing the academic performance of nursing students registered for the biological science subject at the specific nursing education institution.A qualitative, contextual, exploratory and descriptive design was used. Utilising an appreciative inquiry approach as a positive evaluation process, 429 nursing students participated in the study. Data were collected utilising self–reported appreciative interview schedule, field notes and reflective diary.The findings of the content analysis process revealed factors influencing the academic performance in biological science. The main factors identified were biological science content, characteristics of educators, educational strategies, resources and biological science assessments. The recommendations were suggested to involve stakeholders, namely nursing education institution management, nurse educators, nursing students and Eastern Cape Department of Health to actively play their various towards the positive academic performance of nursing students in the biological sciences nursing education institutions.http://www.ajol.info/journal_index.php?jid=153&ab=ajpherd2016-09-30am201

Schistosomiasis and Urinary Bladder Cancer in North Western Tanzania: A Retrospective Review of 185 Patients.

Worldwide, cancers of the urinary bladder are well known to be associated with environmental chemical carcinogens such as smoking and occupational exposure to polycyclic aromatic hydrocarbons. These cancers are typically transitional cell carcinoma (urothelial carcinoma). In areas where schistosomiasis is endemic there is a high incidence of squamous cell carcinoma of the urinary bladder. Schistosomiasis causes chronic granulomatous cystitis leading to squamous metaplasia of transitional epithelium, and subsequently development of squamous cell carcinoma. The western part of Tanzania on the shores of Lake Victoria is such an endemic area. This study was done to document the burden of urinary bladder cancer associated with schistosomiasis in this region. This was a descriptive retrospective study of histologically confirmed cases of urinary bladder cancer seen at the Department of Pathology Bugando Medical Centre (BMC) over a period of 10 years. Data were retrieved from the records of the Departments of Pathology, Medical Records and Surgery. Data were analyzed by the use of contingency tables. A total of 185 patients were diagnosed with cancer of the urinary bladder during the study period, where as 90 (48.6%) were males and 95 (51.4) were females. The mean age at diagnosis was 54.3 years. Squamous cell carcinoma was the most frequent histological type (55.1%), followed by conventional transitional cell carcinoma (40.5%). Eighty three of all cancer cases (44.9%) were found to have schistosomal eggs. Schistosomiasis was commonly associated with squamous cancers compared to non squamous cancers. Most of the cancers associated with schistosomiasis had invaded the muscularis propria of the urinary bladder at the time of diagnosis (p<0.001) and such cancers were frequent below 50 years of age with a significant statistical difference (p<0.001). Poorly differentiated tumors were more frequent in females than males with a significant statistical difference (p=0.006). The majority of urinary bladder cancers seen in the Lake Region were squamous cell carcinoma associated with schistosomiasis. These cancers showed an aggressive behavior and were commonly seen in the younger age groups. Effective control of schistosomiasis in this region should significantly reduce the burden of urinary bladder cancer

Response assessment in lymphoma with PET/CT

No abstact available

Physical and biological processes at the Subtropical Convergence in the South-west Indian Ocean

A detailed hydrographic and biological survey was conducted in the region of the Subtropical Convergence in the Indian sector of the Southern Ocean in April 2007. Hydrographic data revealed that the subsurface expression of the Subtropical Convergence (at 200 m), marked by the 10°C isotherm, appeared to meander considerably between 41°S and 42°15'S. Total surface chlorophyll-a concentration was low and ranged from 0.03 to 0.42 μg l-1 and was always dominated by the pico- ( 0.05). The Zooplankton community was dominated, numerically and by biomass, by mesozooplankton comprising mainly copepods of the genera, Oithona, Paraeuchaeta, Pleuromamma, Calanus and Clausocalanus. An exception was recorded at those stations in the region of the front where the tunicate, Salpa thompsoni, dominated the total Zooplankton biomass