This study proposes to improve the water stability of polyvinyl alcohol (PVA) artificial bone scaffolds via thermal treatment. With a braiding technique, PVA fibers are made into PVA bone scaffolds with a three-dimens...
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This study proposes to improve the water stability of polyvinyl alcohol (PVA) artificial bone scaffolds via thermal treatment. With a braiding technique, PVA fibers are made into PVA bone scaffolds with a three-dimensional structure, after which physical crosslinking is performed by applying a thermal treatment. Surface morphology, porosity, and water stability of the bone scaffolds are evaluated in order to determine the influence of the temperatures of the thermal treatment. The test results show that thermal treatment does not cause any change in braiding structure of the bone scaffolds. However, being thermally treated at a high temperature causes some fibers to break. The bone scaffolds retain a high porosity and yield increasing water stability after the thermal treatment. As a result, applying thermal treatment successfully augments the water stability of the PVA bone scaffolds.
This study aims to examine the influence of melt-blending cycles on the mechanical properties and far-infrared ray (FIR) emissivity of the polypropylene (PP)/wood flour (WF) wood plastic composites. The FIR emissive P...
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This study aims to examine the influence of melt-blending cycles on the mechanical properties and far-infrared ray (FIR) emissivity of the polypropylene (PP)/wood flour (WF) wood plastic composites. The FIR emissive PP/WF wood plastic composites are made by melt-blending for 1, 2, 3, 4, 8, and 16 cycles, after which the products are evaluated for FIR emissivity and mechanical properties. The wood plastic composites that are melt-blended at 16 cycles can yield properties at a certain level with the tensile strength being 30.76 MPa, flexural strength being 51.16 MPa, Izod impact strength being 165.75 J/m, and FIR emissivity being 0.89 Ε.
In this study, sodium alginate (SA)/gelatin mixture is cross-linked with different cross-linking processes to form SA/gelatin composite membranes, which are then tested for swelling ratio, degradation ratio, and water...
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In this study, sodium alginate (SA)/gelatin mixture is cross-linked with different cross-linking processes to form SA/gelatin composite membranes, which are then tested for swelling ratio, degradation ratio, and water contact angle. The test results show that the differing cross-linking agents and cross-linking processes are correlated with the swelling ratio and degradation ratio. This study successfully creates SA/gelatin composite membranes with a high swelling ratio and long degradation duration by using different cross-linking agents. In particular, the composite membranes that have cross-linked with two different agents have a greater swelling ratio and a prolonged degradation duration, compared to those made with other manufacturing processes.
manufacturing companies are confronted with short product life cycles, more variety of products and short cycles of leap innovations. This results in a higher frequency of changes in factory structures and an increasi...
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ISBN:
(纸本)9780791844274
manufacturing companies are confronted with short product life cycles, more variety of products and short cycles of leap innovations. This results in a higher frequency of changes in factory structures and an increasing importance of factory planning processes. Factory planning processes are characterized by participative and interdisciplinary processes due to various actors dealing in different domains and working in distributed environments. The result is a heterogeneous ITlandscape based on increasing use of multiple isolated and domain-specific IT tools and systems and hereby an increasing redundant, inhomogeneous and inconsistent data-holding. The control of these factory planning processes can be reached by holistic approaches and consistent system integration. The mean of system integration is the consideration of all domains involved in planning processes, used IT tools and systems and business processes. In this paper, the approach of a Federative Factory Data Management (FFDM) based on Service Oriented Architecture (SOA) and Semantic Model funded by the DFG (Germany) and CAPES (Brazil) will be described, which faces up the described challenges of factory planning processes. The focus of this approach is on the integration of isolated used IT tools for the dimensioning and structuring of factory systems, the generated domain-specific partial models as well as the coordination and synchronization of engineering workflows. In order of the control of factory planning processes the integration and coupling of the views of products, processes and resources on metadata level is required for a communication between different isolated and domain-specific IT tools of the various involved domains without losses or redundancies. The integration and coupling of these three views is based on a document independent factory structure description linked with factory defining metadata. In order to integrate and couple these different views, the relevant information and inde
This paper presents a new method to evaluate and display trimmed NURBS surfaces using the Graphics Processing Unit (GPU). Trimmed NURBS surfaces, the de facto standard in commercial 3D CAD modeling packages, are curre...
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ISBN:
(纸本)1595936661
This paper presents a new method to evaluate and display trimmed NURBS surfaces using the Graphics Processing Unit (GPU). Trimmed NURBS surfaces, the de facto standard in commercial 3D CAD modeling packages, are currently tessellated into triangles before being sent to the graphics card for display since there is no native hardware support for NURBS. Previous GPU-based NURBS display methods relied on first approximating the NURBS patches with lower degree Bezier patches before evaluation. Our method uses a GPU fragment program to evaluate the surface point coordinates of the original NURBS patch directly, from the control points and knot vectors stored as textures in graphics memory. This evaluated surface is trimmed during display using a dynamically generated trim-texture calculated via alpha blending. The implementation incorporates dynamic Level of Detail (LOD) for real-time interaction at different resolutions of the NURBS surfaces. We obtain rendering speeds at least one order of magnitude faster than evaluation using the CPU.
The audible noise produced by three‐phase, squirrel‐cage induction motors, is caused by the space harmonics of the flux‐density distribution in the air gap of the machine. When the motor is supplied by a frequency ...
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