Connecting glass with heat bonds is a way to create all-transparent glass structures. Two methods have been researched in theory and practice, glass welding, through local heating, and glass fusion through global heating.
Abstract
Wire arc additive manufacturing (WAAM) is a promising alternative to laser-powder based additive manufacturing for fabricating large metallic components due to its high productivity and low cost. The high heat input of the arc welding process causes significant thermal stresses resulting in large distortion of the components. Finite element methods are widely used to analysis arc welding and additive manufacturing process, while the commonly used Gaussian or Double ellipsoid volumetric heat source model requires a large number of mesh points suffering from computational expensive and time consuming. This paper describes the well-distributed volumetric heat source model for numerical simulation of wire arc additive manufacturing process on large components. The proposed well-distributed heat source model is insensitive to mesh, showing a significant advantage with respect to the computational time. The simulated temperature history and distribution are verified by comparison
AUSTIN, Texas Despite advances in medicine and technology, childbirth isn’t likely to get much easier on women from a biological perspective. Engineers at The University of Texas at Austin and University of Vienna revealed in new research a series of evolutionary trade-offs that have created a near-perfect balance between supporting childbirth and keeping organs intact on a day-to-day basis. Human reproduction is unique because of the comparatively tight fit between the birth canal and baby’s head, and it is likely to stay that way because of these competing biological imperatives. The size of the pelvic floor and canal is key to keeping this balance. These opposing duties have constrained the ability of the pelvic floor to evolve over time to make childbirth easier because doing that would sacrifice the ability to protect organs.
Despite advances, childbirth is not likely to become easier for women from a biological perspective
Despite advances in medicine and technology, childbirth isn t likely to get much easier on women from a biological perspective.
Engineers at The University of Texas at Austin and University of Vienna revealed in new research a series of evolutionary trade-offs that have created a near-perfect balance between supporting childbirth and keeping organs intact on a day-to-day basis. Human reproduction is unique because of the comparatively tight fit between the birth canal and baby s head, and it is likely to stay that way because of these competing biological imperatives.
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