63 Hits in 4.7 sec

Putting holes in holey geometry

Gilbert Louis Bernstein, Chris Wojtan
2013 ACM Transactions on Graphics  
Specifically, we provide the first method for topology change applicable to arbitrary non-solid, non-manifold, non-closed, self-intersecting surfaces.  ...  Abstract This paper presents a method for computing topology changes for triangle meshes in an interactive geometric modeling environment.  ...  Thank you to the researchers involved in compiling and maintaining both the Brown Mesh Set and Princeton Shape Benchmark. Thank you also to Siddhartha Chaudhuri for providing the cow model we used.  ... 
doi:10.1145/2461912.2462027 fatcat:wtkhgvojb5b4jemdnuycguwtcm

Broadband spoof plasmons and subwavelength electromagnetic energy confinement on ultrathin metafilms

Miguel Navarro-Cía, Miguel Beruete, Spyros Agrafiotis, Francisco Falcone, Mario Sorolla, Stefan A. Maier
2009 Optics Express  
A numerical analysis of the textured surface is carried out and compared to previous prominent topologies such as metal mesh, slit array, hole array, and Sievenpiper mushroom surfaces, which are studied  ...  These well-documented geometries suffer from a narrowband response, alongside, in most cases, metal thickness constraint (usually of the order of λ/4) and non-subwavelength modal size as a result of the  ...  Nevertheless, the slits are not useful for planar guiding and the mushroom topology shows an undesired narrow band response where the mode is sensibly away from the light line as its flatness put in evidence  ... 
doi:10.1364/oe.17.018184 pmid:19907609 fatcat:dwc74ojconahpme2gzfqgtrwti

Future foam: Nontrivial topology from bubble collisions in eternal inflation

Raphael Bousso, Ben Freivogel, Yasuhiro Sekino, Stephen Shenker, Leonard Susskind, I-Sheng Yang, Chen-Pin Yeh
2008 Physical Review D  
We study pocket universes which have zero cosmological constant and non-trivial boundary topology. These arise from bubble collisions in eternal inflation.  ...  In geometries with one boundary of any genus a timelike observer can see the entire boundary. Geometries with multiple disconnected boundaries can also occur.  ...  Acknowledgements We thank Tom Banks, Simeon Hellerman and Eva Silverstein for helpful discussions.  ... 
doi:10.1103/physrevd.78.063538 fatcat:gmwy4nb26nbr7adoahshxnjjze

Micro-scale fluid behavior during cryo-EM sample blotting [article]

Maxim Armstrong, Bong-Gyoon Han, Salvador Gomez, John Turner, Daniel A Fletcher, Robert M. Glaeser
2019 biorxiv/medrxiv   pre-print
from a flat, hydrophilic surface.  ...  We suggest that similar topological features of the liquid film are produced during the standard technique used to blot EM grids and that these manifest in nonuniform ice after vitrification.  ...  Stephen Morris for discussions that provided crucial background information. Dr. Mike Vahey participated in early experiments leading up to the work presented here.  ... 
doi:10.1101/791285 fatcat:eswwccgr75dhfjgfvkzo3znq7a

A colorful origin for the genetic code: Information theory, statistical mechanics and the emergence of molecular codes

Tsvi Tlusty
2010 Physics of Life Reviews  
diverse amino-acids, for error-tolerance and for minimal cost of resources.  ...  The noise in the channel brings about an error-graph, in which edges connect codons that are likely to be confused.  ...  Acknowledgements The author is indebted to Albert Libchaber for introducing him to the problem of the genetic code and for numerous scientific discussions.  ... 
doi:10.1016/j.plrev.2010.06.002 pmid:20558115 fatcat:aawnx4olznavvo7njmx2mxmf4i

Reasoning about space: The hole story

Achille C. Varzi
2003 Logic and Logical Philosophy  
A very preliminary and much shorter version appeared as 'Spatial Reasoning in a Holey World' in Pietro Torasso (ed.), Advances in Artificial Intelligence (Lecture Notes in Artificial Intelligence 728,  ...  Preliminary versions were also delivered at conferences in Chambery, Paris, Trento, Buffalo, Bloomington, and Bielefeld; I am thankful to participants for stimulating discussion.  ...  It follows immediately that H is irreflexive and asymmetric; no hole is a hole in itself, and there is no room for holey loops: TH1 ¬H(x, x) TH2 H(x, y) → ¬H(y, x).  ... 
doi:10.12775/llp.1996.001 fatcat:uy4h2ev5rzedlcyo7bhxhctr4a

Black rings

Roberto Emparan, Harvey S Reall
2006 Classical and quantum gravity  
A black ring is a five-dimensional black hole with an event horizon of topology S1 x S2. We provide an introduction to the description of black rings in general relativity and string theory.  ...  This locus corresponds to a timelike surface in spacetime at which ∂/∂t changes from timelike to spacelike, i.e., it is an ergosurface.  ...  A spatial cross section of this surface has topology S 1 × S 2 .  ... 
doi:10.1088/0264-9381/23/20/r01 fatcat:upbjvqd3nrcjxgralkm7hg527e

Label-free DNA biosensing by topological light confinement

Gianluigi Zito, Gennaro Sanità, Bryan Guilcapi Alulema, Sofía N. Lara Yépez, Vittorino Lanzio, Fabrizio Riminucci, Stefano Cabrini, Maria Moccia, Concetta Avitabile, Annalisa Lamberti, Vito Mocella, Ivo Rendina (+1 others)
2021 Nanophotonics  
This work aims at a precise and ultrasensitive approach for developing low-cost point-of-care tools suitable for routine disease prescreening analyses in laboratory, also adaptable to industrial production  ...  Large-area and transparent all-dielectric metasurfaces sustaining photonic bound states in the continuum (BICs) provide a set of fundamental advantages for ultrasensitive biosensing.  ...  Acknowledgment: We are thankful to Scott Dhuey, Molecular Foundry, Lawrence Berkeley National Laboratory, USA, for assistance in fabrication process.  ... 
doi:10.1515/nanoph-2021-0396 fatcat:p3qdvnpijrbunpfxjze32jg7yu

The Hole Argument and Some Physical and Philosophical Implications

John Stachel
2014 Living Reviews in Relativity  
The 1970s saw a revival of interest in the hole argument, growing out of attempts to answer the question: Why did three years elapse between Einstein's adoption of the metric tensor to represent the gravitational  ...  Although it includes a review of its history, its primary aim is a discussion of the contemporary implications of the hole argument for physical theories based on dynamical, background-independent space-time  ...  This change enlarges the class of physical solutions: For example, not fixing the global topology of allows several possibilities for the global topology associated with a given local metric.  ... 
doi:10.12942/lrr-2014-1 pmid:28163626 pmcid:PMC5253803 fatcat:cdggl4fw6jei5mlssqka2ekd5i

Fourier transform on high-dimensional unitary groups with applications to random tilings [article]

Alexey Bufetov, Vadim Gorin
2017 arXiv   pre-print
In this direction we prove the Kenyon-Okounkov's conjecture (which predicts asymptotic Gaussianity and exact form of the covariance) for a family of non-simply connected polygons.  ...  Another application is a central limit theorem for the U(N) quantum random walk with random initial data.  ...  This leads to polygonal domains of high complexity and arbitrary topology.  ... 
arXiv:1712.09925v1 fatcat:mds563ijizd6jccyb26ist6lyu

Topology optimization of anisotropic broadband double-negative elastic metamaterials

Hao-Wen Dong, Sheng-Dong Zhao, Yue-Sheng Wang, Chuanzeng Zhang
2017 Journal of the mechanics and physics of solids  
In this paper, we use topology optimization to design the two-dimensional single-phase anisotropic elastic metamaterials with broadband double-negative indices and numerically demonstrate the superlensing  ...  in the future.  ...  The inner geometry in (a) shows an orthogonal example. The numbers of 1, 2 and 3 in (b) and (c) represent the evolution order as the possible EMM topology changes.  ... 
doi:10.1016/j.jmps.2017.04.009 fatcat:ya45ftribvbkxa7ufzdfluvbmy

A dialog on the fate of information in black hole evaporation [article]

Alejandro Perez, Daniel Sudarsky
2022 arXiv   pre-print
We present two alternative perspectives for the resolution of Hawking's information puzzle in black hole evaporation. The two views are deeply contrasting, yet they share several common aspects.  ...  In this respect both of our scenarios are deeply influenced by ideas that Roger Penrose has advocated at various times and thus serves to illustrate the lasting influence that his deep thinking on these  ...  We thank Guillermina Cabral and Bruno Costa for carefully reading the manuscript, pointing out mistakes in the first drafts, and helping make it more clear and readable.  ... 
arXiv:2205.08469v1 fatcat:cahvltftkja5ngl2uxu5ayhs3u

Cryo-electron tomography provides topological insights into mutant huntingtin exon 1 and polyQ aggregates

Jesús G. Galaz-Montoya, Sarah H. Shahmoradian, Koning Shen, Judith Frydman, Wah Chiu
2021 Communications Biology  
The formation and topology of filamentous mHTT inclusions in the brain (hallmarks of HD implicated in neurotoxicity) remain elusive.  ...  This provides a basis for future cryoET studies of various aggregated mHTT and polyQ constructs to improve their structure-based modeling as well as their identification in cells without fusion tags.  ...  so large as to not fit in the holes of the holey-carbon cryo-electron microscopy (cryoEM) support grid or as to preclude penetration by the electron beam.  ... 
doi:10.1038/s42003-021-02360-2 fatcat:fk3tfm2rrfeulip2z3ebuhmd3y


Liangliang Liu, Zhuo Li
2022 Electromagnetic Waves  
Metamaterials offer great promise for engineering electromagnetic properties beyond the limits of natural materials.  ...  The first one is the description of subwavelength corrugated metal surfaces by a metamaterial that hosts an effective plasma frequency.  ...  Through the field enhancement provided by spoof surface plasmon modes, light-matter interactions can be strengthened, which allows for the detection of small changes in the dielectric environment of the  ... 
doi:10.2528/pier22011301 fatcat:6w2gfcgkijdgfc6irtcqgb2bzy

Electromagnetic Response of Extraordinary Transmission Plates Inspired on Babinet's Principle [chapter]

Miguel Navarro-Cia, Miguel Beruete, Mario Soroll
2011 Behaviour of Electromagnetic Waves in Different Media and Structures  
To put this pedagogically in an example within the context of the topic of the chapter, let us show the response of hole and disk arrays infinitely extended transversally and illuminated by a plane-wave  ...  be obtained from those of the hole array by considering the complementary excitation after the following changes (Marqués et al., 2005) : inc inc hole patch cB E = (7a) inc inc hole patch Ec B =− (7b  ... 
doi:10.5772/18036 fatcat:ijpv2seufbfclbbyxwioacpim4
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