ABSTRACT
We present the results of extensive Monte Carlo simulations of intercalated manganese-titanium (Mn-Ti) layered TiS2 crystals. The computational model involves mixtures of Mn and Ti in various percentages placed on a triangular lattice with fixed lattice sites and up to five layers. The range of concentrations of intercalated Mn studied was 5% ⩽ X Mn ⩽ 33% and for Ti, 0% ⩽ X Ti ⩽ 15%, where X A denotes the percentage of the total number of lattice sites occupied by species A. The species are allowed to interact spatially through a screened Coulomb potential and magnetically with external and RKKY field terms. Structurally, the pure Mn systems present as disordered at very low densities and evolve through a 2 × 2 structure (perfect at X Mn = 25%) up to a [Formula: see text] × [Formula: see text] lattice (perfect at X Mn = 33%), with variations of the two 'perfect' lattice structures depending on density. Changes in density for pure Mn systems as well as those intercalated with both Mn and Ti dramatically affects the system's structural and magnetic properties, and the magnetic behavior of various morphological features present in the system are discussed. The RKKY interaction is adjusted based on the intercalant compositions and is very sensitive to structural variations in the intercalant layers. The composition ranges studied here encompass and exceed those that are experimentally accessible, which helps place experimentally relevant densities in perspective.
ABSTRACT
Few studies exist about burnout in physical therapists. No research is available on burnout in orthopaedic therapists. The purpose of this study was to determine if burnout exists in this group and if a relationship exists between burnout scores and selected variables. Members of the Orthopaedic Section of the American Physical Therapy Association from the east north central region of the United States were sent a survey consisting of demographic questions and the Maslach Burnout Inventory. The return rate was 38.7%. Burnout levels were low to moderate depending on the grouping used to examine the data. All of the variables examined (eg., years as a physical therapist, number of patients seen per day) showed very low correlations with subscale scores. Further research is needed to identify those at most risk for burnout and to find effective strategies for its prevention.