The flow past heated topography is examined with both linear and nonlinear models. It is first shown that the forcing of an obstacle with horizontally homogenous surface heating can be approximated by the forcing of an obstacle with surface heating isolated over the obstacle. The small-amplitude flow past an obstacle with isolated heating is then examined with a linear model. Under the linear approximation, the flow response to heated topography is simply the addition of the separate responses to thermal and orographic forcing. These separate responses are first considered individually and then the combined response is examined. Nondimensional parameters are developed that measure the relative importance of thermal and orographic forcing. Nonaxisymmetric forcing is then considered by examining the flow along and across a heated elliptically shaped obstacle. It is shown that the low-level lifting is maximized when the flow is along the major axis of the obstacle.The linear solutions are then tested in a nonlinear anelastic model. The response to a heat source and orography are first examined separately. Good agreement is found between nonlinear and linear models for the individual responses to thermal and orographic forcing. The case of uniformly heated flow past an obstacle is then examined. In these simulations, the thermal response is isolated by subtracting the orographic-only response from the full thermal-orographic response. The numerical simulations are able to capture the main features of the thermal response. Finally, numerical simulations of the flow along and across an elliptically shaped heated obstacle are examined, where it is verified that the lifting is maximized when the flow is along the major axis of the obstacle.These results are extended in Part II of this study to examine the moist convective response to flow over both idealized terrain and the complex terrain of the Rocky Mountains of the United States.
Previous studies have shown that thunderstorms in the Rocky Mountain region have preferred areas in which to form. There has been some indication that these areas depend on the midtropospheric wind direction. A nonhydrostatic model with a terrain-following horizontal grid is employed to investigate the initiation of precipitating convection over heated topography. Horizontally homogeneous meteorological conditions with no directional shear in the vertical wind profile are used.The numerical simulations indicate that precipitating convection was more likely to be generated downwind of ridges than upwind of them. Initiation of these storms was more likely downwind of ridges with their long axis parallel to the wind direction than downwind of ridges with their long axis perpendicular to the wind direction. In Part I of this study it was shown that heating-induced convergence is larger downwind of a ridge with its longer axis parallel to the wind direction. For the orographic configuration of the Rocky Mountains, total precipitation is maximized for southerly and northwesterly winds. Slower wind speeds are more likely and faster wind speeds are less likely to produce convective storms. Soundings with larger instability are more likely to produce convection. The soundings with a greater temperature lapse rate produce more initiation locations, and soundings with greater moisture produce greater amounts of precipitation.Even though a number of assumptions were made for this study, the authors believe the results explain a significant amount of the observed variability in the initiation locations of precipitating convection in the Rocky Mountains during the summer. Because of the theoretical basis for this work, detailed in Part I of this study, the authors believe it should explain convective initiation in other mountainous areas that are subject to strong solar heating.
Objectives The overall aim of this comprehensive systematic review was to identify the best available evidence on the effect of team characteristics, processes, structure and composition within the context of collaborative practice among nursing teams that create a healthy work environment. Search strategy The search strategy sought to find both published and unpublished studies and papers written in the English language. An initial limited search of Medline and CINAHL databases was undertaken to identify optimal search terms. A second extensive search using all identified keywords and index terms was then undertaken. Methodological quality Two independent reviewers assessed the methodological quality of retrieved papers using the corresponding checklist from the System for the Unified Management, Assessment and Review of Information (SUMARI) package. Results The papers included in the review included nine experimental or quasi-experimental studies, 11 descriptive studies and four qualitative studies. A variety of different team structures such as interdisciplinary teams, primary nursing, team nursing, multidisciplinary models of care delivery and the use of a Partner in Patient Care model were investigated. Team characteristics should include accountability, commitment, enthusiasm and motivation. Social support within a team from a supervisor or colleague increased satisfaction levels of staff. Conclusion The results of the review lead to the development of a number of recommendations for practice that could assist with creating a health work environment.
Objectives The objective of this review was to appraise and synthesise the best available evidence on the feasibility, meaningfulness and effectiveness of nursing leadership attributes that contribute to the development and sustainability of nursing leadership to foster a healthy work environment. Inclusion criteria This review considered quantitative and qualitative research papers that addressed the feasibility, meaningfulness and effectiveness of developing and sustaining nursing leadership to foster a healthy work environment in healthcare. Papers of the highest level of evidence ratings were given priority. Participants of interest were leaders and those who were affected by leadership, specifically staff and patients. Interventions of interest including positive leadership attributes, as well as system and policy constructs, that impact on the development and sustainability of nursing leadership within the healthcare environment were considered in the review. Search strategy The search strategy sought to find both published and unpublished studies and papers, limited to the English language. An initial limited search of MEDLINE and CINAHL was undertaken followed by an analysis of the text words contained in the title and abstract, and of the index terms used to describe the paper. A second extensive search was then undertaken using all identified key words and index terms. Methodological quality Each paper was assessed by two independent reviewers for methodological quality prior to inclusion in the review using an appropriate critical appraisal instrument from the System for the Unified Management, Assessment and Review of Information (SUMARI) package. Results A total of 48 papers, experimental, qualitative and textual in nature, were included in the review. The majority of papers were descriptive and examined the relationships between leadership styles and characteristics and particular outcomes, such as satisfaction. Because of the diverse nature of these papers meta-analysis of the results was not possible. For this reason, this section of the review was presented in narrative form. The qualitative and textual papers were analysed using The Joanna Briggs Institute-Qualitative Assessment and Review Instrument and The Joanna Briggs Institute-Narrative, Opinion and Text Assessment and Review Instrument. The process of meta-synthesis embodied in these programs involves the aggregation or synthesis of findings or conclusions. Eight syntheses were derived with key themes related to collaboration, education, emotional intelligence, organisational climate, professional development, positive behaviours and qualities and the need for a supportive environment. Conclusion A combination of leadership styles and characteristics was found to contribute to the development and sustainability of a healthy work environment. The current work conducted in this area provides a solid foundation for future directions in research.
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