Estimates indicate that by 2010 RN demand will exceed supply by over 400,000 full-time equivalents and by 2020 the RN shortage will increase to over 1 million. Turnover is a major contributor to the nursing shortage and job dissatisfaction is a well-established cause of nursing turnover. Understanding RN job satisfaction is an objective that is critical to keeping experienced nurses working in nursing and minimizing RN turnover. Many facets of RN job satisfaction have been examined in previous studies; however, much of the variance in job satisfaction remains unexplained. The purpose of this study was to explore job strain, body mass index, and background information variables (age, education, ethnicity, number of years in nursing, and perceived general health) as possible predictors of job satisfaction among hospital staff nurses. Resilience was examined for its mediating and moderating effects on the relationships between job strain and job satisfaction and body mass index and job satisfaction. The research design was cross-sectional and correlational. Surveys were mailed to RNs across the state of Texas. Reliable instruments were used to measure hospital staff RN job satisfaction, job strain, and resilience. Body mass index was calculated based on self-reported height and weight. From a sampling frame of full-time, hospital staff RNs purchased from the Texas Board of Nursing, a random sample of 556 RNs was obtained. The response rate was 27.6% (n = 147). Results showed that 25.2% of the RNs sampled reported high job strain. Job strain was significantly related to body mass index, and high job strain was significantly negatively related to job satisfaction. High job strain explained 24.7% of the variance in job satisfaction. None of the background information variables were significantly related to job satisfaction. Resilience had a moderating effect on the relationship between job strain and job satisfaction. Resilience did not mediate or moderate the relationship between body mass index and job satisfaction. Future research should focus on creating a nurse-specific instrument that measures job strain in hospital staff RNs. Intervention studies that investigate the effects of resilience training on the job satisfaction of hospital staff RNs should also be conducted. / text

Aim: The aim of the study was to analyse the psychosocial factors in work- and private life and its correlation with various stress-related symptoms and ill health among employees at a faculty at the Linnaeus University. The goal was also to analyze whether there was a gender difference in these health parameters associated with a difference in psychosocial work and home conditions between women and men. Method: Data were collected through a questionnaire were the responders answered questions about demand, control and social support which emanated from Karasek's demand control model. Their professional position was determined by their pay-and educational level in accordance with the theory of the social gradient of health. Stress was measured using "SCGP scale" and mental illness with the help of the ”General Health Qestionnarie.” Two regression analyses were conducted, the first to analyze the correlation between psychosocial factors and stress-related symptoms and the other to analyze the correlation between psychosocial factors and mental ilness. Results: High demand, low control, low social support and lower professional position had a strong relationship (p<0,000)  with both stress-related symptoms ( R = 0,49) and mental illness ( R = 0,56) even after controlling for confounders.The strongest own relationship (when the overlap effects between different variables was taken into account) were found between high demands and stress-related symptoms (standardized beta 0.35) and high demands and mental illness (standardized beta 0.38). Conclusion: Due to the cross-sectional nature of the study causal inferences cannot be made. However the results showed that high demand, low control and low social support together had a strong correlation with stress-related ill-health. Furthermore, the study showed no gender differences in the psychosocial factors which is a likely explanation for the fact that there was no difference between men and women in neither stress related symptoms or mental illness. This is an important and positive finding because of the fact that the result indicates that differences in health between men and women is reduced when they have equal opportunities in work and private life. / Mål: Målet med studien var att analysera psykosociala faktorer i arbets- och privatliv och dess samband med stressrelaterad ohälsa bland de anställda på en fakultet vid Linnéuniversitetet. Målet var även att analysera huruvida det fanns en könskillnad i dessa hälsoparametrar kopplad till en skillnad i psykosociala förutsättningar mellan kvinnor och män. Metod: Data samlades in via en enkätstudie där de anställda fick svara på frågor kring krav, kontroll och socialt stöd vilka utgick från Karasek´s krav kontroll modell. Individernas plats i yrkeshierarkin avgjordes av deras lön samt utbildningsnivå i enlighet med teorin kring hälsans sociala gradient. De frågor som berörde hemarbete utgick ifrån tidigare forskning på området. Stress mättes med hjälp av ”SCGP scale”, en skala som mäter olika stressrelaterade symtom och psykisk ohälsa mättes med hjälp av ”General Health Qestionnarie”. Två regressionsanalyser genomfördes, den första regressionen analyserade samband mellan psykosociala faktorer och stressrelaterade symtom och den andra regressionen analyserade samband mellan psykosociala faktorer och psykisk ohälsa. Resultat: Höga krav, låg kontroll, lågt socialt stöd samt lägre yrkesposition hade tillsammans ett starkt samband, (p <0,001) med både stressrelaterade symtom (R = 0,49) och psykisk ohälsa (R = 0,56), även efter kontroll för confounders. Det starkaste egna sambandet (när överlappningseffekter mellan olika variabler tagits hänsyn till) återfanns mellan höga krav och stressrelaterade symtom (standardiserad beta 0,35) respektive höga krav och psykisk ohälsa (standardiserad beta 0,38). Konklusion: Resultatet visade att höga krav, låg kontroll, lågt socialt stöd samt lägre plats i yrkeshierarkin tillsammans hade ett starkt samband med stressrelaterade symtom samt psykisk ohälsa. På grund av studiens tvärsnittsdesign kan dock inte orsak och verkan säkerställas. Vidare visade studien inga könsskillnader i ovannämnda psykosociala faktorer vilket är en trolig förklaring till att det inte heller fanns någon skillnad mellan kvinnor och män i stressrelaterade symtom samt psykisk ohälsa. Detta är ett viktigt och positivt fynd då resultatet indikerar på att skillnader i ohälsa mellan kvinnor och män går att utjämna genom att skapa lika förutsättningar i arbets- och privatliv.

Deformable modeling of facial soft tissues have found use in application domains such as human-machine interaction for facial expression recognition. More recently, such modeling techniques have been used for tasks like age estimation and person identification. This dissertation is focused on development of novel image analysis algorithms to follow facial strain patterns observed through video recording of faces in expressions. Specifically, we use the strain pattern extracted from non-rigid facial motion as a simplified and adequate way to characterize the underlying material properties of facial soft tissues. Such an approach has several unique features. Strain pattern instead of the image intensity is used as a classification feature. Strain is related to biomechanical properties of facial tissues that are distinct for each individual. Strain pattern is less sensitive to illumination differences (between enrolled and query sequences) and face camouflage because the strain pattern of a face remains stable as long as reliable facial deformations are captured. A finite element modeling based method enforces regularization which mitigates issues (such as temporal matching and noise sensitivity) related to automatic motion estimation. Therefore, the computational strategy is accurate and robust. Images or videos of facial deformations are acquired with video camera and without special imaging equipment. Experiments using range images on a dataset consisting of 50 subjects provide the necessary proof of concept that strain maps indeed have a discriminative value. On a video dataset containing 60 subjects undergoing a particular facial expression, experimental results using the computational strategy presented in this work emphasize the discriminatory and stability properties of strain maps across adverse data conditions (shadow lighting and face camouflage). Such properties make it a promising feature for image analysis tasks that can benefit from such auxiliary information about the human face. Strain maps add a new dimension in our abilities to characterize a human face. It also fosters newer ways to capture facial dynamics from video which, if exploited efficiently, can lead to an improved performance in tasks involving the human face. In a subsequent effort, we model the material constants (Young's modulus) of the skin in sub-regions of the face from the motion observed in multiple facial expressions. On a public database consisting of 40 subjects undergoing some set of facial motions, we present an expression invariant strategy to matching faces using the Young's modulus of the skin. Such an efficient way of describing underlying material properties from the displacements observed in video has an important application in deformable modeling of physical objects which are usually gauged by their simplicity and adequacy. The contributions through this work will have an impact on the broader vision community because of its highly novel approaches to the long-standing problem of motion analysis of elastic objects. In addition, the value is the cross disciplinary nature and its focus on applying image analysis algorithms to the rather difficult and important problem of material property characterization of facial soft tissues and their applications. We believe this research provides a special opportunity for the utilization of video processing to enhance our abilities to make unique discoveries through the facial dynamics inherent in video.

Self-control and various elements comprising this construct have received much credit over the years as it has been able to account for a large amount of variance in delinquency rates. Some research has suggested that individual difference factors (e.g., self-control) can overwhelm external factors (e.g., neighborhoods; see Loeber & Wikström, 2000). Others have found that social influences (e.g., employment; see Wright, et al, 2001) have more pronounced effects for those most at-risk. Because of the equivocal nature of the empirical findings, this study seeks to replicate and extend previous efforts. Specifically, the influence of constructs derived from social learning, control, deterrence, and strain are examined to see if any vary in their influence on adolescent offending as a function of self-control. Results indicate that all of these theoretical constructs (with the exception of paternal attachment) played a more important role among those who evinced the highest levels of self-control. Implications for criminological theory and criminal justice policy are discussed.

Fibrin is a biopolymer that assembles into a network during blood coagulation to become the structural scaffold of a blood clot. The precise mechanics of this network are crucial for a blood clot to properly stem the flow of blood at the site of vascular injury while still remaining pliable enough to avoid dislocation. A hallmark of fibrin's mechanical response is strain-stiffening: at small strains, its response is low and linear; while at high strains, its stiffness increases non-linearly with increasing strain. The physical origins of strain-stiffening have been studied for other biopolymer systems but have remained elusive for biopolymer networks composed of stiff filaments, such as fibrin. To understand the origins of this intriguing behavior, we directly observe and quantify the motion of all of the fibers in the fibrin networks as they undergo shear in 3D using confocal microscopy. We show that the strain-stiffening response of a clot is a result of the full network deformation rather than an intrinsic strain-stiffening response of the individual fibers. We observe a distinct transition from a linear, low-strain regime, where all fibers avoid any internal stretching, to a non-linear, high-strain regime, where an increasing number of fibers become stretched. This transition is characterized by a high degree of non-affine motion. Moreover, we are able to precisely calculate the non-linear stress-strain response of the network by using the strains on each fiber measured directly with confocal microscopy and by assuming the fibers behave like linearly elastic beams. This result confirms that it is the network deformation that causes the strain-stiffening behavior of fibrin clots. These data are consistent with predictions for low-connectivity networks with soft, bending, or floppy modes. Moreover, we show that the addition of small contractile cells, platelets, increases the low-strain stiffness of the network while the high-strain stiffness is independent of the presence of the platelets; this is also consistent with expectations for small contractile elements in a network with low connectivity. Our results elucidate the origins of strain-stiffening in fibrin networks as well as the mechanism underlying platelet-induced clot stiffening. / Physics

The effects that thermally induced forces and deformations have on the performance and safety of steel columns subjected to fire are not well understood and are not clearly treated in building codes and standards. This thesis investigates the behavior of steel columns subjected to fire, with an emphasis on studying the significance of thermally induced forces and deformations. The approach used in this research is to conduct a series of analyses of steel columns using the finite element computer program ABAQUS. Columns are modeled in ABAQUS using beam elements that include nonlinear geometry, nonlinear temperature dependent material properties, and initial geometric imperfections. Using the ABAQUS model, a series of analyses are conducted on the behavior of columns under axial compression for temperatures varying from room temperature up to 2400° F. A series of individual columns are analyzed with and without restraint to thermal expansion. A column that is part of a truss is also analyzed to study a simple case of a flexible restraint to thermal expansion. Finally, the behavior of columns that are part of multi-story steel moment frames are investigated. All of the analyses conducted in this research indicate that forces generated by restraint to thermal expansion can have a very large impact on the performance of a steel column in fire. When evaluating the safety of a column in a fire, it is important to recognize that the total axial force in the column is the sum of the force generated by external gravity load on the frame and the force generated by restraint to thermal expansion. The force generated by restrained thermal expansion can be very large, and neglecting this force can lead to unsafe designs. / text

Three sheet materials, including high purity aluminum, commercial purity aluminum, and an aluminum-magnesium alloy with 3 wt% magnesium, were produced into single-crystals in the solid-state. The method, developed in 1939 by T. Fujiwara at Hiroshima University, involves straining a fully recrystallized material then passing it into a furnace with a high temperature gradient at a specific rate. This method preserves composition and particulate distributions that melt-solidification methods do not. Large single crystals were measured for their orientation preferences and growth rates. The single-crystals were found to preferably orient their growth direction to the <120> to <110> directions, and <100> to <111> directions normal to the specimen surface. The grain boundary mobility of each material was found to be a function of impurity content. The mobility constants observed were similar to those reported in the literature, indicating that this method of crystal growth provides an estimate of grain boundary mobility. This is the first study the effect of impurities and alloying to this single-crystal production process, and to show this method’s applicability in determining grain boundary mobility information. / text

With the gradual advance of the state-of-the-art VLSI manufacturing technology into the sub-45nm regime, engineering a reliable, high performance VLSI chip with economically attractive yield in accordance with Moore's law of scaling and integration has become extremely difficult. Some of the most serious challenges that make this task difficult are: a) the delay of a transistor is strongly dependent on process induced mechanical stress around it, b) the reliability of devices is affected by several aging mechanisms like Negative Bias Temperature Instability (NBTI), hot carrier injection (HCI), etc and c) the delay and reliability of any device are strongly related to lithographically drawn geometry of various features on wafer. These three challenges are the main focus of this dissertation. High performance fabrication processes routinely use embedded silicon-germanium (eSiGe) technology that imparts compressive mechanical stress to PMOS devices. In this work, cell level timing models considering flexibility to modulate active area to change mechanical stress, were proposed and exploited to perform timing optimization during circuit placement phase. Analysis of key physical synthesis optimization steps such as gate sizing and repeater insertion was done to understand and exploit mechanical stress to significantly improve delay of interconnect and device dominated circuits. Regarding circuit reliability, the proposed work is focused on reducing the clock skew degradation due to NBTI effect specially due to the use of clock gating technique for achieving low power operation. In addition, we also target the detrimental impact of burn-in testing on NBTI. The problem is identified and a runtime technique to reduce clock skew increase was proposed. For designs with predictable clock gating activities, a zero overhead design time technique was proposed to reduce clock skew increase over time. The concept of using minimum degradation input vector during static burn-in testing is proposed to reduce the impact of burn-in testing on parametric yield. Delay and reliability strongly depend on dimension of various features on the wafer such as gate oxide thickness, channel length and contact position. Increased variability of these dimensions can severely restrict ability to analyze or optimize a design considering mechanical stress and circuit reliability. One key technique to control physical variability is to move towards regular fabrics. However, to make implementation on regular fabrics attractive, high quality physical design tools need to be developed. This dissertation proposes a new circuit placement algorithm to place a design on a structured ASIC platform with strict site and clock constraints and excellent overall wirelength. An algorithm for reducing the clock and leakage power dissipation of a structured ASIC by reducing spine usage is then proposed to allow lower power dissipation of designs implemented using structured ASICs. / text

Static abnormal grain growth (SAGG) was studied in Al-Mg alloy AA5182 sheet by varying four processing parameters: deformation temperature, strain rate, annealing temperature, and annealing time. SAGG is a secondary recrystallization process related to geometric dynamic recrystallization (GDRX) and requires both deformation at elevated temperature and subsequent static annealing. A minimum temperature is required for both SAGG and GDRX. Recrystallized grains only develop at strains larger than the critical strain for SAGG, [epsilon]SAGG. The size of the recrystallized grains is inversely related to and controlled by the density of SAGG nuclei, which increases as local strain increases. The results of this study suggest that SAGG is controlled by two thermally-activated mechanisms, dynamic recovery and recrystallization. During deformation, dynamic recovery increases as deformation temperature increases or strain rate decreases, increasing the critical strain for SAGG. SAGG is subject to an incubation time that decreases as annealing temperature increases. SAGG can produce grains large enough to reduce yield strength by 20 to 50 percent. The results of this study suggest strategies for avoiding SAGG during hot-metal forming operations by varying processing conditions to increase [epsilon]SAGG. / text

Research indicates that school engagement (SE) and delinquency affect one another and share numerous common causes; however, little literature exists regarding the temporal nature of this relationship. Using the data set from the Children and Young Adult Sample of the 1979 National Longitudinal Survey of Youth, the proposed study will estimate the reciprocal effects of SE and delinquency across time using latent variable structural equation modeling. Specifically, social bonding theory (Hirschi, 2002), strain theory (Agnew, 1992), and the participation-identification model of SE (Finn, 1989), will be drawn upon to create and analyze a cross-lagged panel model. Additionally, this study will identify ages during which school disengagement is most likely to result in participation in delinquent activities. / text