A dimensionless constant is introduced to scale the contributions of component pathways by quantifying their completion with respect to the loading impulse applied. This concept is extended to suggest a new framework to describe the response to arbitrary insult and to show the relevance of particular techniques to component parts of the problem. The application of a step impulse via shock loading is shown to be the primary derivation experiment to address these needs and map components of the response.”
“Objective: The purpose of this study was to evaluate the performance of 5 analysis methods in selleck quantifying
scoliotic deformity, using the spatial positions of SP tips acquired by a custom-developed ultrasound-based system, with different curve fitting
methods and angle metrics in terms of their correlation with Cobb angle, test-retest reliability, vulnerability to digitization errors, and accuracy of identifying end vertebrae and selleck screening library convexity direction. Methods: Three spinal column dry bone specimens were randomly configured to 30 different scoliotic deformities. Raw spatial data of the SP tips were processed by the following 3 methods: (1) fifth-order polynomial fitting, (2) locally weighted polynomial regression (LOESS) with smoothing parameter (alpha) = .25, and (3) LOESS with alpha = .4. Angle between the 2 tangents along the spinal curve with the most positive and negative slopes (ie, posterior deformity AZD2014 solubility dmso angle) and summation of the angles formed by every 2 lines joining 3 neighboring SPs between the end vertebrae (ie, accumulating angle) were computed to quantify scoliotic deformity. Their performances were compared in terms of their correlation with Cobb angle, test-retest reliability, vulnerability to digitization errors, and accuracy of identifying end vertebrae. Results: Posterior deformity angle calculated from the spinal curve constructed by LOESS with alpha = .4 excelled in every aspect of the comparison (ie, Cobb angle, test-retest reliability, vulnerability to digitization errors, and accuracy of identifying end
vertebrae and convexity direction), making it the method of choice of those tested for processing the spatial data of the SP tips in this ultrasonography study using dry bone specimens. Conclusions: The ultrasound-based system and the LOESS (0.4)-posterior deformity angle method developed for this study offer a viable technology for quantifying scoliotic deformity in a reliable and radiation-free manner. However, further validation using scoliosis subjects is needed before they can be used to quantify spinal deformity in the clinical setting.”
“Synthesis of 6-amino-2-azaspiro[3.3]heptane-6-carboxylic acid and 2-azaspiro[3.3]heptane-6-carboxylic acid was performed. Both four-membered rings in the spirocyclic scaffold were constructed by subsequent ring closure of corresponding 1,3-bis-electrophiles at 1,1-C- or 1,1-N-bis-nucleophiles.