Comparison of Soft Curved Crease Surrogate Hinges

2020 ◽  
Author(s):  
Yves Klett ◽  
Peter Middendorf ◽  
Fabian Muhs ◽  
Tomohiro Tachi
Keyword(s):  
Surface Curvature ◽  
Implicit Surface ◽  
Tunable Stiffness ◽  
Folding State

Abstract The use of compliant hinges as integral elements of origami-based and origami-inspired structures can provide significant benefits compared to other hinge concepts, namely ease of integration, durability and tunable stiffness, range and target positioning of the hinge. So far, mostly classical straight-crease constructions have been used for the application of such hinges. Curved-crease geometries impose new constraints on the application of compliant elements in the crease region due to the implicit surface curvature in every non-flat folding state. This paper introduces a new, simple surrogate hinge based on angled slash arrays, and compares their behavior to classical lamina-emergent surrogate hinges.

The enthalpy of vaporization and the liquid surface curvature

1991 ◽  
Vol 56 (7) ◽  
pp. 1400-1403
Author(s):  
Václav Svoboda
Keyword(s):  
Liquid Surface ◽  
Convex Surface ◽  
Enthalpy Of Vaporization ◽  
Surface Curvature

The effect of liquid surface curvature on enthalpy of vaporization is investigated. The limits are found at which this effect begins to manifest itself both for the concave and convex surface.

scholarly journals Sensorized Foam Actuator with Intrinsic Proprioception and Tunable Stiffness Behavior for Soft Robots

2021 ◽  
pp. 2100022
Author(s):  
Saravana Prashanth Murali Babu ◽  
Francesco Visentin ◽  
Ali Sadeghi ◽  
Alessio Mondini ◽  
Fabian Meder ◽  
...  
Keyword(s):  
Soft Robots ◽  
Tunable Stiffness

Lithium Storage in Bowl-like Carbon: The Effect of Surface Curvature and Space Geometry on Li Metal Deposition

2021 ◽  
pp. 2145-2152
Author(s):  
Weibin Ye ◽  
Lina Wang ◽  
Yichen Yin ◽  
Xinhang Fan ◽  
Yong Cheng ◽  
...  
Keyword(s):  
Surface Curvature ◽  
Metal Deposition ◽  
Lithium Storage ◽  
Space Geometry ◽  
Effect Of Surface

scholarly journals Promoter G-quadruplexes and transcription factors cooperate to shape the cell type-specific transcriptome

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Sara Lago ◽  
Matteo Nadai ◽  
Filippo M. Cernilogar ◽  
Maryam Kazerani ◽  
Helena Domíniguez Moreno ◽  
...  
Keyword(s):  
Transcription Factors ◽  
Binding Sites ◽  
Specific Gene ◽  
Open Chromatin ◽  
Rna Seq ◽  
Transcript Levels ◽  
Promoter Sequences ◽  
G Quadruplex ◽  
Cell Type Specific ◽  
Folding State

AbstractCell identity is maintained by activation of cell-specific gene programs, regulated by epigenetic marks, transcription factors and chromatin organization. DNA G-quadruplex (G4)-folded regions in cells were reported to be associated with either increased or decreased transcriptional activity. By G4-ChIP-seq/RNA-seq analysis on liposarcoma cells we confirmed that G4s in promoters are invariably associated with high transcription levels in open chromatin. Comparing G4 presence, location and transcript levels in liposarcoma cells to available data on keratinocytes, we showed that the same promoter sequences of the same genes in the two cell lines had different G4-folding state: high transcript levels consistently associated with G4-folding. Transcription factors AP-1 and SP1, whose binding sites were the most significantly represented in G4-folded sequences, coimmunoprecipitated with their G4-folded promoters. Thus, G4s and their associated transcription factors cooperate to determine cell-specific transcriptional programs, making G4s to strongly emerge as new epigenetic regulators of the transcription machinery.

A novel design of printable tunable stiffness metamaterial for bone healing

2021 ◽  
Vol 116 ◽  
pp. 104345
Author(s):  
Mohammad Saber Hashemi ◽  
Aaron McCrary ◽  
Karl H. Kraus ◽  
Azadeh Sheidaei
Keyword(s):  
Bone Healing ◽  
Tunable Stiffness ◽  
Novel Design

Steric scattering of rod-like swimmers in low Reynolds number environments

Soft Matter ◽  
2021 ◽  
Author(s):  
Kentaro Hoeger ◽  
Tristan Ursell
Keyword(s):  
Reynolds Number ◽  
Cell Size ◽  
Low Reynolds Number ◽  
Surface Curvature ◽  
Natural Environments ◽  
Solid Objects ◽  
Low Reynolds

While navigating natural environments, interactions with cell-size solid objects alter paths of swimming microbes. We characterized such ‘scattering’ from synthetic objects of controlled surface curvature. A sterics-only model agrees well with the data.

Dual-Primal Mesh Optimization for Polygonized Implicit Surfaces With Sharp Features

2002 ◽  
Vol 2 (4) ◽  
pp. 277-284 ◽  
Author(s):  
Yutaka Ohtake ◽  
Alexander G. Belyaev
Keyword(s):  
Adaptive Mesh ◽  
Implicit Surfaces ◽  
Marching Cubes ◽  
Triangle Mesh ◽  
Implicit Surface ◽  
Weighted Vertex ◽  
Visualization Toolkit ◽  
Object Oriented Approach ◽  
Speed And Accuracy ◽  
Dual Mesh

A new method for improving polygonizations of implicit surfaces with sharp features is proposed. The method is based on the observation that, given an implicit surface with sharp features, a triangle mesh whose triangles are tangent to the implicit surface at certain inner triangle points gives a better approximation of the implicit surface than the standard Marching Cubes mesh [Lorensen, W.E., and Cline, H.E., 1987, Computer Graphics (Proceedings of SIGGRAPH ’87), 21(3), pp. 163–169] (in our experiments we use VTK Marching Cubes [Schroeder, W., Martin, K., and Lorensen, W., 1998, The Visualization Toolkit: An Object-Oriented Approach to 3-D Graphics, Prentice Hall]). First, given an initial triangle mesh, its dual mesh composed of the triangle centroids is considered. Then the dual mesh is modified such that its vertices are placed on the implicit surface and the mesh dual to the modified dual mesh is considered. Finally the vertex positions of that “double dual” mesh are optimized by minimizing a quadratic energy measuring a deviation of the mesh normals from the implicit surface normals computed at the vertices of the modified dual mesh. In order to achieve an accurate approximation of fine surface features, these basic steps are combined with adaptive mesh subdivision and curvature-weighted vertex resampling. The proposed method outperforms approaches based on the mesh evolution paradigm in speed and accuracy.

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