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The possibility of such defects re-opening during the component life necessitates optimisation of SLM processing parameters in order to produce the highest bulk density and integrity in the aB-built state.In this paper , novel fractal scanning strategies based upon mathematical fill curves , namely the Hilbert and Peano-Gosper curve , are explored in which the use of short vector length scans , in the order of 100 μm , is used as a method of reducing residual stresses .
 defects, component, SLM, parameters, density, integrity, scanning strategies, mathematical, as, residual stresses
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 defects, component, SLM, parameters, density, integrity, scanning strategies, mathematical, as, residual stresses