Rake angle measurement of inclined slotting cutter
This paper analyses the blade shape, the parameters of rake angle of slotting cutter. The theoretical analysis process of a novel rake angle error measurement is introduced, which is built on the theory that the rake face of the inclined slotting cutter is a flat surface. For the systematic errors is caused by inaccurate measurement, the paper give in-depth analysis in various situation. By testing in the GD40-type CNC Gear Measurement Center, the accuracy testing results validate the correctness of the method.
Efficient Multi-Purpose Algorithm for Approximation and Alignment Problems in Coordinate Measurement Techniques
Approximation- and alignment-problem in the field of coordinate measurement techniques are solved in most cases by using the L2-norm (Gaussian least squares sum) as the objective function. However, for an increasing number of applications the L2-norm leads to inaccurate results so that the Tschebyscheff-norm should be applied instead. These cases are for example the measurement of deviations in form and position, matching-tests or the computational fitting of measured points into tolerance-zones. This paper describes a universal algorithm for the approximation according to both the L2norm and T-norm. Additionally, two limits are calculated in between which the “true” value of the maximum deviation lies. Basic mathematics will be briefly explained and results obtained by measurements will be discussed.
The Alzheimer's Disease Home Hospice Knowledge Scale: development, validity and reliability.
BACKGROUND
Several instruments are available to assess knowledge about hospice care, but none specifically address knowledge about home hospice for persons with Alzheimer's disease (AD).


AIM
To develop and validate the Alzheimer's Disease Home Hospice Knowledge Scale (AD-HHK-S).


METHODS
A total of 107 Israeli family caregivers of persons with dementia (mean age=71.2; 73% female) participated in the study.


RESULTS
The AD-HHK-S included 28 true/false items assessing 3 areas of knowledge: knowledge about hospice, knowledge about home hospice, and knowledge about home hospice for AD. Good internal reliability was found, with Cronbach alpha ranging from 0.72 to 0.85. Good face, construct and predictive validity were found.


CONCLUSIONS
The AD-HHK-S proved to be a valid and reliable tool to assess knowledge about hospice care in the area of AD. It might provide an effective tool for palliative care nurses to communicate with family caregivers of persons with AD at the end of life.