Narvik Sykehus

In this brief, a tracking controller is presented to stabilize the attitude of a micro satellite via integrator backstepping and quaternion feedback. The controller is shown to render the equilibrium points in the closed-loop system uniformly asymptotically stable. Simulations are performed using satellite parameters from the ESEO mission under the European Space Agency's SSETI project.

Purpose The purpose of this paper is to introduce a special issue about the construction industry and the management of its supply chains. It aims to discuss and point to some differences and possible similarities with traditional manufacturing and its supply chains. Design/methodology/approach The paper is mostly a literature review and contains official statistics. Findings The market of the construction company is mostly local and highly volatile. The long durability of the construction “product” contributes to the volatility. The product specification process before the customer order arrives shows different degrees of specifications: engineer to order, modify to order, configure to order, select a variant. (The common make‐to‐stock in traditional manufacturing does not exist.) A construction company only executes a small part of the project by its own personnel and capacity. This is a way of risk spreading and risk mitigation and to compensate for an unstable market. If a construction company wants to establish a new concept, from “engineer to order” to e.g. “configure to order”, it must be engaged earlier in the business process and with other than usual customers, which might complicate the process. Research limitations/implications Experiences from Sweden and Swedish developments are the main source of information. Originality/value The paper introduces the articles that are a source of scientifically generated knowledge regarding various problems and opportunities associated with supply chain management in the project‐based construction industry.

This study has its roots in a clinical application project, focusing on the development of a teaching-learning model enabling participants to understand compassion. During that project four clinical nursing teachers met for a total of 12 hours of experiential and reflective work. This study aimed at exploring participants' understanding of self-compassion as a source to compassionate care. It was carried out as a phenomenological and hermeneutic interpretation of participants' written and oral reflections on the topic. Data were interpreted in the light of Watson's Theory of Human Caring. Five themes were identified: Being there, with self and others; respect for human vulnerability; being nonjudgmental; giving voice to things needed to be said and heard; and being able to accept the gift of compassion from others. A main metaphorical theme, 'the Butterfly effect of Caring', was identified, addressing interdependency and the ethics of the face and hand when caring for Other - the ethical stance where the Other's vulnerable face elicits a call for compassionate actions. The findings reveal that the development of a compassionate self and the ability to be sensitive, nonjudgmental and respectful towards oneself contributes to a compassionate approach towards others. It is concluded that compassionate care is not only something the caregiver does, nor is compassion reduced to a way of being with another person or a feeling. Rather, it is a way of becoming and belonging together with another person where both are mutually engaged and where the caregiver compassionately is able to acknowledge both self and Other's vulnerability and dignity.

BACKGROUND: An increase in physical activity for secondary prevention of cardiovascular disease and cardiac rehabilitation has multiple therapeutic benefits, including decreased mortality. Internet- and mobile-based interventions for physical activity have shown promising results in helping users increase or maintain their level of physical activity in general and specifically in secondary prevention of cardiovascular diseases and cardiac rehabilitation. One component related to the efficacy of these interventions is tailoring of the content to the individual. OBJECTIVE: Our trial assessed the effect of a longitudinally tailored Internet- and mobile-based intervention for physical activity as an extension of a face-to-face cardiac rehabilitation stay. We hypothesized that users of the tailored intervention would maintain their physical activity level better than users of the nontailored version. METHODS: The study population included adult participants of a cardiac rehabilitation program in Norway with home Internet access and a mobile phone. The participants were randomized in monthly clusters to a tailored or nontailored (control) intervention group. All participants had access to a website with information regarding cardiac rehabilitation, an online discussion forum, and an online activity calendar. Those using the tailored intervention received tailored content based on models of health behavior via the website and mobile fully automated text messages. The main outcome was self-reported level of physical activity, which was obtained using an online international physical activity questionnaire at baseline, at discharge, and at 1 month and 3 months after discharge from the cardiac rehabilitation program. RESULTS: Included in the study were 69 participants. One month after discharge, the tailored intervention group (n=10) had a higher median level of overall physical activity (median 2737.5, IQR 4200.2) than the control group (n=14, median 1650.0, IQR 2443.5), but the difference was not significant (Kolmogorov-Smirnov Z=0.823, P=.38, r=.17). At 3 months after discharge, the tailored intervention group (n=7) had a significantly higher median level of overall physical activity (median 5613.0, IQR 2828.0) than the control group (n=12, median 1356.0, IQR 2937.0; Kolmogorov-Smirnov Z=1.397, P=.02, r=.33). The median adherence was 45.0 (95% CI 0.0-169.8) days for the tailored group and 111.0 (95% CI 45.1-176.9) days for the control group; however, the difference was not significant (P=.39). There were no statistically significant differences between the 2 groups in stage of change, self-efficacy, social support, perceived tailoring, anxiety, or depression. CONCLUSIONS: Because of the small sample size and the high attrition rate at the follow-up visits, we cannot make conclusions regarding the efficacy of our approach, but the results indicate that the tailored version of the intervention may have contributed to the long-term higher physical activity maintained after cardiac rehabilitation by participants receiving the tailored intervention compared with those receiving the nontailored intervention. TRIAL REGISTRATION: ClinicalTrials.gov: NCT01223170; http://clinicaltrials.gov/show/NCT01223170 (Archived by WebCite at http://www.webcitation.org/6Nch4ldcL).

[1] Time series (1990–2011) of sea ice thickness observed by moored sonars in the Transpolar Drift in Fram Strait are examined. Contrasting the post-2007 years against the 1990s, three remarkable changes in the monthly ice thickness distributions are highlighted: (1) The thickness of old level ice (modal thickness) is reduced by 32%, (2) the old ice modal peak width is reduced by 25%, and (3) the fraction of (ridged) ice thicker than 5 m is reduced by 50%. The combined effect on the mean ice thickness is a reduction from an annual average of 3.0 m during the 1990s to 2.2 m during 2008–2011. Most of the thinning took place after 2005–2006. While the old ice modal thickness and peak width show signs of recovery after 2008, the decreasing trend in fraction of ridged ice and mean ice thickness persists until the end of the record in 2011. The ice observed in Fram Strait carries an integrated signal of Arctic change due to the advection of ice from many sites in the Arctic. Based on concurrence in timing, we conclude that much of the thinning quantified here is reflecting recent change in the age composition of the Arctic ice cover toward younger ice. The old level ice remains thin, and as such the ice cover remains preconditioned for new summers of very low sea ice extent.

In this paper a result on attitude control of a microsatellite by integrator backstepping based on quaternion feedback is presented, and the controller is shown to make the closed loop equilibrium points asymptotic stable in the sense of Lyapunov. This is a part of a study of possible control methods for the spacecraft European Student Earth Orbiter (ESEO), a spacecraft included in the Student Space Exploration and Technology Initiative (SSETI) project initiated by ESA. The spacecraft is actuated by four reaction control thrusters and one reaction wheel, and simulation results based on data from the satellite are presented.

Abstract Corrosion of embedded steel bars continues to be the principal cause of deterioration of reinforced concrete structures. The most obvious effect is the reduction in cross-sectional area of the affected steel bars. If corrosion is allowed to propagate over a sufficiently long period of time and proper interventions are not made, loss of the bond between the corroded steel bar and the surrounding contaminated concrete may also lead to impaired structural performance and safety of the affected structures. The present paper is devoted to a review of published pullout test data on bond strength of corroded steel bars in concrete. The experimental results are carefully evaluated in order to examine the influence on bond strength of parameters such as corrosion level, bar diameter, bar position, concrete cover, transverse reinforcement and impressed current density. Keywords: concretesteel barcorrosionbond strength Acknowledgements The research leading up to the present paper has been funded by The Research Council of Norway through the project "RECON–Renewal of Concrete Infrastructure" (project no. 159102/I30) at Northern Research Institute Narvik (Norut Narvik) and by the EU's Sixth Framework Programme through the project "Sustainable Bridges" (contract no. FP6-PLT-001653). Permissions received from all authors to reproduce their experimental results in the figures in this paper are highly acknowledged.

Stroke is a life-threatening and disabling illness known to have a significant impact on families. The purpose of this study was to illuminate the long-term experience of family life after stroke of stroke survivors and their spouses and children, particularly regarding marital and parent-child relationships. Thirty-seven narrative interviews were conducted with stroke survivors and their spouses and adult children who were minors at onset of the illness. A qualitative approach inspired by Gadamer's hermeneutic and van Manen's phenomenological understanding of lived experience was used. The analysis revealed four themes: the family as a lifebuoy, absent presence, broken foundations, and finding a new marital path. Lack of communication and altered roles and relationships endangered marital equilibrium and parent-child relationships after stroke. This study highlighted the need for professional family support as families were unprepared for the life changes that occurred. Nurses and other healthcare workers should examine family relationships and communication patterns and view the family as a unit composed of unique persons with different needs. Further research on the experiences of stroke survivors' children seems urgent.

Abstract. The Secchi depth and its relationships to other properties of the sea water in the Oslofjord–Skagerrak area have been investigated. White and black disks of different sizes have been applied, and the Secchi depth has been observed with the naked eye, through colour filters and with a water telescope. Spectral luminances and illuminances have been calculated from recordings of radiance and irradiance, and attenuation coefficients have been determined. A theoretical expression for the Secchi depth based on luminances has been tested against field observations, and it is found that the field results for the product of Secchi depth and attenuation coefficients are on average only 4% less than the predicted value for the white disk. For the Secchi depths observed through colour filters or for the black disk, the average field results are more than 30% smaller than the theoretical estimates. The reduction in the disk diameter from 30 to 10 cm should theoretically reduce the Secchi depths by 13–22%, while the field observations show an average reduction of 10–20%. Similarly we find from theory that the removal of sun glitter should increase the Secchi depth by 12%, while the observed increase is 14% on average for the white disk. Our overall conclusion is that the theoretical expression works well for the white disk, but less so for the colour filter observations and the black disk. Statistical relationships between Secchi depths and attenuation coefficients have been determined, and it is found that the root-mean-square errors relative to the mean value are smaller for the beam attenuation coefficients (12–24%, white disk) than for the vertical attenuation coefficients (16–65%, white disk). The depth of the 1% level of surface quanta irradiance (PAR) can be estimated with a relative root-mean-square error of 23% from observations of the white Secchi depth. Similar estimates of chlorophyll a and total suspended material will have rms errors in the range 40–90%. Our conclusion becomes that the Secchi depth observation is a very useful tool for checking the value and order of magnitude of other related quantities in the Oslofjord–Skagerrak area.

This paper highlights the dark side of power imbalance regarding its consequences in agri-food supplier-buyer relationships. We report on findings from two studies. The first study is based on a sample of 105 key informants, while study 2 is based on a sample of 444 key informants, all from the cocoa agri-food supply market of Ghana. While the first study focuses on the antecedents of power imbalance and its consequences, the second study explores the role of cooperatives/collective action in minimizing supplier exploitation. Data from these studies were analysed using the partial least squares technique (SmartPLS). Analysis of these findings shows switching costs' impact on power imbalance to be curvilinear, while power imbalance has a curvilinear relationship with opportunism. The negative consequences of power imbalance are further exacerbated by dependency and the lack of joint action. Furthermore, we found the negative impact of power imbalance on financial performance to be stronger for non-cooperative members than for cooperative members, while, counterintuitively, we found the positive impact of economic satisfaction on financial performance to be stronger for non-cooperative members than for cooperative members.

In this paper, a model of a leader-follower spacecraft formation in six degrees of freedom is derived and presented. The nonlinear model describes the relative translational and rotational motion of the spacecraft, and extends previous work by providing a more complete factorization, together with detailed information about the matrices in the model. The resulting model shows many similarities with models for systems such as robot manipulators and marine vehicles. In addition, mathematical models of orbital perturbations due to gravitational variations, atmospheric drag, solar radiation and third-body effects are presented for completeness. Results from simulations are presented to visualize the properties of the model and to show the impact of the different orbital perturbations on the flight path.

In this paper we undertake the rigorous homogenization of a system of partial differential equations describing the transport of a N-component electrolyte in a dilute Newtonian solvent through a rigid porous medium. The motion is governed by a small static electric field and a small hydrodynamic force, which allows us to use O’Brien's linearized equations as the starting model. We establish convergence of the homogenization procedure and discuss the homogenized equations. Even if the symmetry of the effective tensor is known from the literature [J. R. Looker and S. L. Carnie, Transp. Porous Media, 65, 107 (2006)], its positive definiteness does not seem to be known. Based on the rigorous study of the underlying equations, we prove that the effective tensor satisfies Onsager properties, namely is symmetric positive definite. This result justifies the approach of many authors who use Onsager theory as starting point.

BACKGROUND: Nursing care is guided by a value base focusing on promoting dignity and health by means of the caring relationship. However, previous research has revealed that negative attitudes towards 'addicted' patients, as well as these patients' behaviour, can give rise to negative emotions such as frustration and disappointment among nurses. This can contribute to a judgmental and controlling attitude towards patients. To preserve order, nursing interventions focusing on creating structure and stability could be applied in a way that challenges caring values. AIMS AND OBJECTIVES: This study aimed to describe how nurses' working in inpatient psychiatric care experience caring encounters with patients suffering from substance use disorder (SUD). DESIGN: This qualitative study is part of a clinical application project focusing on value-based care of patients suffering from SUD. Data were obtained during four reflective group dialogues with six nurses in a psychiatric hospital. METHODS: The transcribed dialogues were subjected to latent qualitative content analysis. RESULTS: The analysis facilitated the organisation of the findings into a coherent pattern. A common thread of meaning was conceptualised as a theme labelled 'the multifaceted vigilance', describing how nurses strived to deliver good care, while at the same time being vigilant towards patients' behaviour as well as their own reactions to it. Within that theme, four categories described experiences related to different challenges nurses face in caring encounters. CONCLUSION: We suggest that this perhaps unavoidable aspect of caring encounters can be an asset. Thus, if acknowledged and subject to reflection, being vigilant could be understood as a strength enabling nurses to safeguard caring values, and to use their authority to promote patients' health and alleviate suffering.

An effort is made to analyse the stresses experienced by the human femur. In order to achieve these results a CAD model was developed by using the 3-D scanning of generic human femur for an individual of 70 kg weight (approx. averaged adult weight). The marrow cavity has been approximated as a hollow cylinder. The FEM model was built using solid tetrahedral element (20-noded 186 structural solid, ANSYS®). The model was analysed for its sensitivity. The results were computed for the range of loads. In this analysis, the maximum stress and its location were noted. In addition, the critical value of load was estimated for ultimate failure (i.e. fracture). The evaluated results give an understanding of the natural safety factor. The presented results are of significant importance in replication of the natural design parameters in creating the synthetic bone substitutes.

BACKGROUND: Faecal occult blood test (FOBT) screening has been shown to decrease the incidence and mortality from colorectal cancer. This study compared the stage profile of patients with colorectal cancer diagnosed at the first FOBT screening round with that of an unscreened control group. METHODS: Subjects aged 60-64 years were allocated randomly to biennial FOBT screening (52 998 subjects) or a control group (53 002) in a Finnish prospective public health policy in 2004-2006. FOBT was performed with a guaiac test. At the end of 2007 the screened and control populations were linked to the Finnish Cancer Registry database, and the colonoscopic findings in the screen positives were analysed. RESULTS: Early-stage colorectal cancer was observed in 52 per cent of the FOBT-positive subjects, in 42.2 per cent of the total screened population and in 38 per cent of the control population (P = 0.191 for FOBT positives, P = 0.592 for total screened population). The prevalence of adenomas and colorectal cancer was 31.5 and 8.2 per cent respectively among the 806 subjects with a positive FOBT. Some 27.3 per cent of all colorectal tumours in the screened population were interval cancers. The tumour was located in the right colon in 28.9 per cent of the screened subjects and 22 per cent of controls (P = 0.255). CONCLUSION: Biennial FOBT screening improves detection of colorectal cancer at the first screening round, but the high percentage of interval cancers is a cause for concern.

S PACECRAFT mission success is often highly dependent on the performance and robustness of the attitude control system, which consists of different types of actuators, such as reaction control thrusters, reaction wheels, and magnetic actuators. Solutions to spacecraft attitude control problems often rely on inherent assumptions that the onboard actuators are able to deliver the exact torque desired by the attitude controller at a specified time. The actuators are thus assumed to have no dynamics, or the actuator dynamics are assumed to be fast enough to allow them to be neglected. Although this has shown to be a sufficient approach in the past, it is obvious that attitude actuators, as all electromechanical devices, have dynamics that might impact controller performance. With an increasing demand for high-precision attitude control for purposes such as formation control and optical intersatellite links, the necessity of including actuator dynamics within the control solution is increasingly evident. Mathematical modelling of the complex and nonideal dynamical behavior of actuators and its influence on spacecraft attitude control is a cumbersome task. This dynamical behavior has traditionally been found through laboratory testing, and the subsequent controller design has been influenced by these considerations. One example in this direction is the requirement of reaction thruster response delays being less than the duration of the minimum activation pulse of the actuator. There exist, however, theoretical results from themodelling and analysis of actuator dynamics, such as in [1], in which the effect of unmodelled fast actuator dynamics on the output feedback stabilization of feedback linearizable systems is studied. Similarly, in [2,3], the robust stabilization of a class of nonlinear systems in the presence of unmodelled actuator and sensor dynamics is investigated. More applicable results for our purpose are found in [4,5], in which general multiple-input/multiple-output (MIMO) linear actuator models for underwater vehicle thrusters with dynamics are presented. Because underwater vehicle thrusters are essentially propellers connected to dc motors, analogous to, for example, reaction wheels for spacecraft attitude control, is it possible to describe other actuators with the same model subject to minor changes and tuning. In this paper, we substantiate a unified mathematical model of various attitude control actuators for space applications, in particular, reaction thrusters, reaction wheels, and magnetic torquers. The general actuator dynamical model is based on the marine technology work of [5], appropriately fitted to the aforementioned actuator categories. To describe time delays in the response of actuators such as, for example, thrusters, an expansion of the general actuatormodel is suggested.

Cet article traite de l’homogénéisation d’une équation aux dérivées partielles en dimension un d’espace, avec des coefficients aléatoires stationnaires et mélangeants, en présence d’u terme d’ordre zéro fortement oscillant. Nous montrons qu’avec un choix convenable du facteur d’échelle de ce terme d’ordre zéro, les solutions du problème étudié convergent en loi, et nous décrivons le processus limite. On peut noter que la dynamique limite est elle aussi aléatoire.

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We address the problem of output feedback attitude control of a rigid body in quaternion coordinate space via a modified PD+ based tracking controller. Angular velocity is replaced by a low-gain dynamic extension. The controller ensures fast convergence to the desired operating point during transient maneuvers, while keeping the gains small. This contributes to diminishing the sensitivity to measurement noise hence, energy consumption may be expected to drop along with a decrease of the residual. More precisely, we show uniform practical asymptotic stability of the equilibrium point for the closed loop system in the presence of unknown, bounded input disturbances. Simulation results illustrate the performance improvement with respect to PD+ based output feedback control with static gains.

BACKGROUND: Internet-based physical activity interventions have great potential in supporting patients in cardiac rehabilitation. Health behavior change theories and user input are identified as important contributors in the effectiveness of the interventions, but they are rarely combined in a systematic way in the design of the interventions. OBJECTIVE: The aim of this study is to identify the appropriate theoretical framework, along with the needs of the users of a physical activity intervention for cardiac rehabilitation, and to combine them into an effective Internet- and mobile-based intervention. METHODS: We explain the theoretical framework of the intervention in a narrative overview of the existing health behavior change literature as it applies to physical activity. We also conducted a focus group with 11 participants of a cardiac rehabilitation program and used thematic analysis to identify and analyze patterns of meaning in the transcribed data. RESULTS: We chose stage-based approaches, specifically the transtheoretical model and the health action process approach as our main framework for tailoring, supplemented with other theoretical concepts such as regulatory focus within the appropriate stages. From the thematic analysis of the focus group data, we identified seven themes: (1) social, (2) motivation, (3) integration into everyday life, (4) information, (5) planning, (6) monitoring and feedback, and (7) concerns and potential problems. The final design of the intervention was based on both the theoretical review and the user input, and it is explained in detail. CONCLUSIONS: We applied a combination of health behavioral theory and user input in designing our intervention. We think this is a promising design approach with the potential to combine the high efficacy of theory-based interventions with the higher perceived usefulness of interventions designed according to user input. TRIAL REGISTRATION: Clinicaltrials.gov NCT01223170; http://clinicaltrials.gov/show/NCT01223170 (Archived by WebCite at http://www.webcitation.org/6M5FqT9Q2).