Auditory perception of word elements in beginning reading through visual and kinesthetic speech clues

Thesis (Ed.D.)--Boston University

Clinical application of resorbable polymers in guided bone regeneration

Conference Theme: Cell Biomaterial ReactionOpen Access JournalINTRODUCTION: Long segmental diaphyseal bone loss often results from high energy trauma like blast injury, osteomyelitis or wide excision of malignant conditions. Treatment of this long segmental diaphyseal defects remain a difficult clinical problem. In the literature, many authors have reported that bone loss more than 2.5 cm always require bone grafting. This is probably the critical size defect in human. Non-vascularized bone graft frequently fails if the defect is longer than 6-7 cm. 2.5 cm is probably the critical size defect in human and 7 cm is likely the critical size for non-vascularized bone graft. Various treatment methods are adopted currently to address this problem, including vascularized bone graft, distraction osteogenesis and massive allograft. However, all these methods are associated with …published_or_final_versio

Problems of Selecting the Wavelet Transform Parameters in the Aspect of Surface Texture Analysis

This paper discusses one of the most important problems related to analysis of surface texture using wavelet analysis - the problem of selection of mother wavelet and decomposition level. The literature related to wavelet transform does not explicitly determine which mother wavelet is most suitable for surface profile analysis and at which level of decomposition this analysis should be performed. The paper describes the criteria of selection of the mother wavelet from the aspect of analysis of two-dimensional surface texture. Details of the algorithms are also included. The calculations were performed on the 3D roughness profiles. The evaluation was based on five selection criteria: autocorrelation test, Pearson correlation, evaluation of 3D roughness parameters, Hotelling test and entropy-based method. The calculations were performed in authorial computer procedures coded in MATLAB software

Bone regeneration with resorbable polylactide membrane and sponge in an unstable fracture model in rabbit radius

Open Access journalConference Theme: Bone Tissue EngineeringBACKGROUND: Healing of segmental diaphyseal bone defects in animals can be enhanced by covering the defects with resorbable polylactide membranes. Based on the results of bone healing in defects 10 mm long in the rabbit radii, it was suggested that the membranes prevents muscle and soft tissue from invading the defect and maintains osteogenic cells and osteogenic substances within the space covered with membrane, thus promoting new bone formation. OBJECTIVES: 1. To investigate and …published_or_final_versionpublished_or_final_versio

Biological Evaluation of Flexible Polyurethane/Poly l-Lactic Acid Composite Scaffold as a Potential Filler for Bone Regeneration

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Dimensional and Shape Accuracy of Foundry Patterns Fabricated Through Photo-Curing

This paper deals with the potential use of the PolyJet Matrix (PJM) technology and digital materials to fabricate foundry patterns. The primary purpose of the study was to assess the dimensional and shape accuracy of additively manufactured objects by determining the draft angle as well as the roundness, waviness and roughness parameters. The experiments were conducted for cylindrical samples printed using VeroWhite liquid polymer resin. The analysis focused on the relationship between the build direction and the geometry and surface finish of prints. Three different orientations, i.e. 0º, 45º and 90º, were considered. The surface texture analysis involved comparing the statistical, graphical and numerical data, including calculation results obtained with the wavelet transform method. The findings confirm that the build direction has a significant effect on the dimensional and shape accuracy of prints and that the PJM technology can be used to fabricate precise foundry patterns, especially in investment (lost-wax) casting

Multiscale assessment of additively manufactured free-form surfaces

The article reviews the results of experimental tests assessing the impact of process parameters of additive manufacturing technologies on the geometric structure of free-form surfaces. The tests covered surfaces manufactured with the Selective Laser Melting additive technology, using titanium-powder-based material (Ti6Al4V) and Selective Laser Sintering from polyamide PA2200. The evaluation of the resulting surfaces was conducted employing modern multiscale analysis, i.e., wavelet transformation. Comparative studies using selected forms of the mother wavelet enabled determining the character of irregularities, size of morphological features and the indications of manufacturing process errors. The tests provide guidelines and allow to better understand the potential in manufacturing elements with complex, irregular shapes

Rozproszone znaczniki czasu

The need for a reliable determination of the time of certain events is not new, but until recently has been limited to relatively few applications. With increasing amount of data stored only in digital form, it become necessary to easily check their credibility. In this article we would like to point out the direction of possible developments and present a distributed security solutions, offering greater scalability and able to provide anonymity

Quality of surface texture and mechanical properties of PLA and PA-based material reinforced with carbon fibers manufactured by FDM and CFF 3D printing technologies.

The paper presents the results of mechanical tests of models manufactured with two 3D printing technologies, FDM and CFF. Both technologies use PLA or PA-based materials reinforced with carbon fibers. The work includes both uniaxial tensile tests of the tested materials and metrological measurements of surfaces produced with two 3D printing technologies. The test results showed a significant influence of the type of technology on the strength of the models built and on the quality of the technological surface layer. After the analysis of the parameters of the primary profile, roughness and waviness, it can be clearly stated that the quality of the technological surface layer is much better for the models made with the CFF technology compared to the FDM technology. Furthermore, the tensile strength of the models manufactured of carbon fiber-enriched material is much higher for samples made with CFF technology compared to FDM