Temperature dependence of spin resonance in cobalt substituted NiZnCu ferrites

Cobalt substitutions were investigated in Ni0.4Zn0.4Cu0.2Fe2O4 ferrites, initial complex permeability was then measured from 1 MHz to 1 GHz. It appears that cobalt substitution led to a decrease in the permeability and an increase in the \mus\timesfr factor. As well, it gave to the permeability spectrum a sharp resonance character. We also observed a spin reorientation occurring at a temperature depending on the cobalt content. Study of the complex permeability versus temperature highlighted that the most resonant character was obtained at this temperature. This shows that cobalt contribution to second order magnetocrystalline anisotropy plays a leading role at this temperature

Temperature dependence of core loss in cobalt substituted Ni-Zn-Cu ferrites

The temperature dependence of core loss in cobalt substituted Ni-Zn-Cu ferrites was investigated. Co2+ ions are known to lead to a compensation of the magneto-crystalline anisotropy in Ni-Zn ferrites, at a temperature depending on the cobalt content and the Ni/Zn ratio. We observed similar behaviour in Ni-Zn-Cu and it was found that the core loss goes through a minimum around this magneto-crystalline anisotropy compensation. Moreover, the anisotropy induced by the cobalt allowed a strong decrease of core loss, a ferrite having a core loss of 350 mW/cm3 at 80 ^\circ C was then developed (measured at 1.5 MHz and 25 mT). This result represents an improvement of a factor 4 compared to the state of art Ni-Zn ferrites

Clinical, Kinematic, and Kinetic Analysis of Knee Arthrodesis in Support of the Design of a Novel Treatment Alternative

The following body of work is the result of collaborative efforts between researchers at Clemson University and a team of practicing orthopedic surgeons. It begins with the identification of an inadequately addressed clinical need, the treatment of severe knee dysfunction, in the practices of our clinical collaborators. A case report, reviewing the condition of five affected patients, is presented to provide initial evidence for the existence of this need. A thorough review of the causes and currently available treatment options for knee dysfunction, including arthrodesis, is provided to clarify the need and establish its widespread significance, and a novel treatment model is proposed and discussed with respect to existing treatments. In spite of a large number of recently published clinical case reports, the total number of affected patients has been heretofore unreported. In order to establish this figure in further support of the need for an alternative treatment, a large database of hospital discharge records is analyzed. An estimate of the frequency of knee arthrodesis is provided, and the affected patients are characterized. Having quantified the incidence of the primary treatment method, and thus provided an estimate of the affected patient subpopulation, the effect of this treatment on lower body biomechanics is addressed. A gait analysis study was designed to simulate knee arthrodesis in normal, healthy subjects, providing a comprehensive quantification of joint kinematics and kinetics and allowing for the investigation of further hypotheses regarding the effects of treatment. In spite of a number of reported cases of mechanical failure in knee arthrodesis implant designs, the robustness of these designs against such failure has been a neglected subject in literature. Data obtained from a previously conducted gait analysis study is used to estimate the loading conditions at an immobilized knee through the construction of a computational biomechanical model. The purpose of this model is to estimate the resultant effects of knee immobilization on the musculoskeletal system during gait, and estimates of muscle and joint loading patterns are provided. Together, this knowledge is used to assist in the design and development of a novel treatment model, in the form of a salvage total knee replacement. This patent pending treatment is designed to subsume existing, less constrained treatment methods as well, broadening its applicability. It has been refined over the course of several design cycles, which were informed by the regulatory guidelines for medical device design in the United States. Prototyping techniques have been used throughout the design process to demonstrate proof of concept. This work is intended to establish the significance of an unmet clinical need, characterize the patient subset and treatment patterns affected by the need, quantify the biomechanical conditions in the bodies of affected patients, and ultimately facilitate the translation of a proposed medical device from concept to clinical use

Ethnomethodological studies of nurse-patient and nurse-relative interactions: A scoping review

Objectives: Researchers in nursing science interested in the study of nurse-patient and nurse-relative interactions have displayed an ever increasing interest in ethnomethodology and conversation analysis. This review assesses the scope of this literature. We categorize the papers in thematic categories determined both inductively and deductively and synthesize the main findings of this literature within category. Finally we discuss the interactional determinants of the lack patient participation, the limitations of the field, and focus on implications. Design: A scoping review on nurse-patient and nurse-relative interactions. Data sources: Forty articles focusing on nurse-patient interactions and nurse-relative interactions. All the articles relied on ethnomethodology and/or conversation analysis. Review methods: A literature search has been carried out on Medline (all articles until June 2016; keywords were: nurs*.ab. and “conversation analysis”; nurs*.ab. and ethnomethodology). A similar search was performed on other platforms. The scope of the literature was identified by inductively and deductively analyzing the themes of the relevant articles. Results: Six thematic categories emerged: Organization of nurse-patient interaction (eleven articles); Organization of mediated nurse-patient interaction (seven articles); Information, explanation and advice (eight articles); Negotiation and influence asymmetry (six articles); Managing emotions in critical illness (two articles); and Interacting with patients presenting reduced interactional competences (six articles). Conclusions: Across most thematic categories it appeared that patient participation is far from ideal as interactional asymmetry was most observed in favor of nurses. When the encounters occurred at the patients’ homes this pattern was reversed. Computer-mediated interactions were often reported as nonoptimal as the standardized process constrained communication and delayed patients’ presentation of their ailments. Micro-analyses of interaction present a clear potential for the development of guidelines for nurse-patient interactions. Implications for practice are described