Zobrazeno 1 - 10
of 7 322
pro vyhledávání: '"Randall, D"'
In this work, we investigate the topological properties of knotted defects in smectic liquid crystals. Our story begins with screw dislocations, whose radial surface structure can be smoothly accommodated on $S^3$ for fibred knots by using the corres
Externí odkaz:
http://arxiv.org/abs/2410.04670
Knitting turns a one dimensional yarn into a highly ramified three-dimensional structure. As a method of additive manufacturing, it holds promise for a new class of lightweight, ultrastrong materials. Here we present a purely geometric model to predi
Externí odkaz:
http://arxiv.org/abs/2408.08409
Autor:
Niyonzima, Jean de Dieu, Jeridi, Haifa, Essaoui, Lamya, Tosarelli, Caterina, Vlad, Alina, Coati, Alessandro, Royer, Sebastien, Trimaille, Isabelle, Goldmann, Michel, Gallas, Bruno, Constantin, Doru, Babonneau, David, Garreau, Yves, Croset, Bernard, Kralj, Samo, Kamien, Randall D., Lacaze, Emmanuelle
Smectic liquid crystals can be viewed as model systems for lamellar structures for which there has been extensive theoretical development. We demonstrate that a nonlinear energy description is required with respect to the usual Landau-de Gennes elast
Externí odkaz:
http://arxiv.org/abs/2407.10598
Publikováno v:
PNAS 120 (2023) e2311957120
Focal conic domains, are defects characteristic of layered liquid crystal phases. Their association can built flowers where petals are the ellipses of the Dupin cyclides involved in these defect. We report here the observation of focal conic flowers
Externí odkaz:
http://arxiv.org/abs/2310.09212
Autor:
Severino, Paul G., Kamien, Randall D.
Publikováno v:
Phys. Rev. E 109 (2024) L012701
Volterra's definition of dislocations in crystals distinguishes edge and screw defects geometrically, according to whether the Burgers vector is perpendicular or parallel to the defect. Here, we demonstrate a distinction between screw and edge disloc
Externí odkaz:
http://arxiv.org/abs/2304.07105
Autor:
de Franca, F. O., Virgolin, M., Kommenda, M., Majumder, M. S., Cranmer, M., Espada, G., Ingelse, L., Fonseca, A., Landajuela, M., Petersen, B., Glatt, R., Mundhenk, N., Lee, C. S., Hochhalter, J. D., Randall, D. L., Kamienny, P., Zhang, H., Dick, G., Simon, A., Burlacu, B., Kasak, Jaan, Machado, Meera, Wilstrup, Casper, La Cava, W. G.
Symbolic regression searches for analytic expressions that accurately describe studied phenomena. The main attraction of this approach is that it returns an interpretable model that can be insightful to users. Historically, the majority of algorithms
Externí odkaz:
http://arxiv.org/abs/2304.01117
Publikováno v:
Communications Earth & Environment, Vol 5, Iss 1, Pp 1-8 (2024)
Abstract To mitigate climate change, some seek to store carbon from the atmosphere in agricultural soils. However, our understanding about how agriculture affects soil organic carbon is muddied by studies (1) lacking longitudinal data, (2) ignoring b
Externí odkaz:
https://doaj.org/article/94f24407ebd44fb7b246176eeb3b7388
Autor:
Ciurlo, Anna, Campbell, Randall D., Morris, Mark R., Do, Tuan, Ghez, Andrea M., Becklin, Eric E., Bentley, Rory O., Chu, Devin S., Gautam, Abhimat K., Gursahani, Yash A., Hees, Aurelien, O'Neil, Kelly Kosmo, Lu, Jessica R., Martinez, Gregory D., Naoz, Smadar, Sakai, Shoko, Schoedel, Rainer
We present two decades of new high-angular-resolution near-infrared data from the W. M. Keck Observatory that reveal extreme evolution in X7, an elongated dust and gas feature, presently located half an arcsecond from the Galactic Center supermassive
Externí odkaz:
http://arxiv.org/abs/2301.06562
Autor:
King, David A., Kamien, Randall D.
Publikováno v:
Phys. Rev. E 107 (2023) 064702
Not every particle that forms a nematic liquid crystal makes a smectic. The particle tip is critical for this behaviour. Ellipsoids do not make a smectic, but sphero-cylinders do. Similarly, only those N-CB alkylcyanobiphenyls with sufficiently long
Externí odkaz:
http://arxiv.org/abs/2301.00267