apparent contour
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2019 ◽  
Vol 16 (09) ◽  
pp. 1950130
Author(s):  
Martín Barajas Sichacá ◽  
Yutaro Kabata

The apparent contour of a surface in [Formula: see text]-space can be investigated in terms of singularity theory. We show the precise bifurcation diagrams of the apparent contours of generic crosscap surfaces with respect to orthogonal projections. Especially, our bifurcation diagrams contain also the information of the projected images of the singular sets of crosscap surfaces.


2017 ◽  
Vol 13 ◽  
pp. 938-951 ◽  
Author(s):  
Johanna Blass ◽  
Jessica Brunke ◽  
Franziska Emmerich ◽  
Cédric Przybylski ◽  
Vasil M Garamus ◽  
...  

Water-soluble shape-persistent cyclodextrin (CD) polymers with amino-functionalized end groups were prepared starting from diacetylene-modified cyclodextrin monomers by a combined Glaser coupling/click chemistry approach. Structural perfection of the neutral CD polymers and inclusion complex formation with ditopic and monotopic guest molecules were proven by MALDI–TOF and UV–vis measurements. Small-angle neutron and X-ray (SANS/SAXS) scattering experiments confirm the stiffness of the polymer chains with an apparent contour length of about 130 Å. Surface modification of planar silicon wafers as well as AFM tips was realized by covalent bound formation between the terminal amino groups of the CD polymer and a reactive isothiocyanate–silane monolayer. Atomic force measurements of CD polymer decorated surfaces show enhanced supramolecular interaction energies which can be attributed to multiple inclusion complexes based on the rigidity of the polymer backbone and the regular configuration of the CD moieties. Depending on the geometrical configuration of attachment anisotropic adhesion characteristics of the polymer system can be distinguished between a peeling and a shearing mechanism.


Author(s):  
Giovanni Bellettini ◽  
Valentina Beorchia ◽  
Maurizio Paolini ◽  
Franco Pasquarelli
Keyword(s):  

Author(s):  
Giovanni Bellettini ◽  
Valentina Beorchia ◽  
Maurizio Paolini ◽  
Franco Pasquarelli
Keyword(s):  

2006 ◽  
Vol 49 (1) ◽  
pp. 29-37 ◽  
Author(s):  
Gianmarco Capitanio

AbstractWe construct a Legendrian version of envelope theory. A tangential family is a one-parameter family of rays emanating tangentially from a regular plane curve. The Legendrian graph of the family is the union of the Legendrian lifts of the family curves in the projectivized cotangent bundle $PT^*\mathbb{R}^2$. We study the singularities of Legendrian graphs and their stability under small tangential deformations. We also find normal forms of their projections into the plane. This allows us to interpret the beak-to-beak perestroika as the apparent contour of a deformation of the double Whitney umbrella singularity $A_1^\pm$.


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