A MATHEMATICAL THEORY OF MATERIALS WITH ELASTIC RANGE AND THE DEFINITION OF BACK STRESS TENSOR

In this paper, the theory of materi als with elastic range by Lucchesi and Podio_Guidugli(1988) has been generalized . It has also shown that there are some difficulties on the definition of back s tress as the “center” of the yield surface in the Cauchy space. The back stres s tensor is Lagrangian,and must be defined in the Lagrangian stress space.

Building Knowledge: The Concept of Care

Aim and Objectives: The aim of this article is to explore whether the specific levels of caring described in Swanson’s Middle Range Caring Theory which include characteristics of caring, people’s concerns and commitments underlying caring, conditions that enhance/inhibit caring and consequences of caring and non-caring could be used in categorizing findings from two literature reviews investigating the concept of care. Background: Nursing has a long legacy as a caring/healing profession where caring is increasingly posited as one of the core concepts in modern nursing science. However, the meanings given to the concept of care remain elusive, ambiguous and unclear. Design: Two systematic literature reviews. Method: Twenty-nine articles based on strategic inclusion and exclusion criteria were synthesized. Data was retrieved from CINAHL, Medline, Embase and PsycInfo covering the period 2003-2016. The literature search used the key words care, concept analysis, systematic review, meta-synthesis, meta-analysis and narrative review. Results: Major themes found were related to the following characteristics of caring persons: compassionate, knowledgeable, positive and reflective. Concerns and commitments underlying caring were doing the right thing, connecting, focusing on the others’ experience, acknowledging individual dignity and worth and being present. Conditions that enhanced/inhibited caring were situational constraints, personality traits, communication skills, health problems and organizational features. Consequences of caring and non-caring actions included both positive and negative emotional, spiritual, physical, and social outcomes for patients, families and nurses. Conclusion: The specific levels of caring described in Swanson’s Middle Range Caring Theory are highly suitable for categorizing the findings from three literature reviews on the concept of care. Relevance to Clinical Practice: Swanson’s Middle Range Caring Theory can be used to guide clinical practice and encourage an individual approach to care. It has been shown to contain clear, comprehensible language in its theoretical basis;this encourages use in clinical practice.

Grey Relation between Nonlinear Characteristic and Dynamic Uncertainty of Rolling Bearing Friction Torque

The rolling bearing friction torque which is characterized by its uncertainty and nonlinearity affects heavily the dynamic performance of a system such as missiles, spacecrafts and radars, etc. It is difficult to use the classical statistical theory to evaluate the dynamic evaluation of the rolling bearing friction torque for the lack of prior information about both probability distribution and trends. For this reason, based on the information poor system theory and combined with the correlation dimension in chaos theory, the concepts about the mean of the dynamic fluctuant range （MDFR） and the grey relation are proposed to resolve the problem about evaluating the nonlinear characteristic and the dynamic uncertainty of the rolling bearing friction torque. Friction torque experiments are done for three types of the rolling bearings marked with HKTA, HKTB and HKTC separately; meantime, the correlation dimension and MDFR are calculated to describe the nonlinear characteristic and the dynamic uncertainty of the friction torque, respectively. And the experiments reveal that there is a certain grey relation between the nonlinear characteristic and the dynamic uncertainty of the rolling bearing friction torque, viz. MDFR will become the nonlinear increasing trend with the correlation dimension increasing. Under the condition of fewer characteristic data and the lack of prior information about both probability distribution and trends, the unitive evaluation for the nonlinear characteristic and the dynamic uncertainty of the rolling bearing friction torque is realized with the grey confidence level of 87.7%-96.3%.