23 papers · ranked by Valyu relevance
Francesco Gargano, M. Sammartino, Vincenzo Sciacca, Kevin W. Cassel
Numerical solutions of the laminar Prandtl boundary-layer and Navier-Stokes equations are considered for the case of the two-dimensional uniform flow past an impulsively-started circular cylinder. We show how Prandtl's solution develops a finite time separation singularity. On the other hand Navier-Stokes solution is…
Xiaohua Shi, Yu Guo, Xuechan Chen, Ziming Chen + 2 more
'Antonio M. Pascoal'] A new method of kinematic analysis and singularity analysis is proposed for a 7-DOF redundant manipulator with three consecutive parallel axes. First, the redundancy angle is described according to the self-motion characteristics of the manipulator, the position and orientation of the end-effector…
Helin Wang, Ziqiang Zhou, Xianyou Zhong, Qijun Chen + 1 more
'David Scaradozzi'] Recently, robotic sensor systems have gained more attention annually in complex system sense strategies. The robotic sensors sense the information from itself and the environment, and fuse information for the use of perception, decision, planning, and control. As an important supplement to…
Dwight Barkley
The mechanism for singularity formation in an inviscid wall-bounded fluid flow is investigated. The incompressible Euler equations are numerically simulated in a cylindrical container. The flow is axisymmetric with the swirl. The simulations reproduce and corroborate aspects of prior studies reporting strong evidence…
Giuseppe Ilario Cirillo, Giuseppe Habib, Gaëtan Kerschen, Rodolphe Sepulchre
'Rodolphe Sepulchre'] Bifurcation theory and continuation methods are well-established tools for the analysis of nonlinear mechanical systems subject to periodic forcing. We illustrate the added value and the complementary information provided by singularity theory with one distinguished parameter. While tracking…
Ayan Roychowdhury, Saptarshi Dasgupta, Madan Rao
Material renewability in active living systems, such as in cells and tissues, can drive the large-scale patterning of forces, with distinctive phenotypic consequences. This is especially significant in the cell cytoskeleton, where multiple species of myosin bound to actin, apply differential contractile stresses and…
Soon Wei Daniel Lim, Joon-Suh Park, Maryna L. Meretska, Ahmed H. Dorrah + 1 more
'Ahmed H. Dorrah' 'Federico Capasso'] Optical phase singularities are zeros of a scalar light field. The most systematically studied class of singular fields is vortices: beams with helical wavefronts and a linear (1D) singularity along the optical axis. Beyond these common and stable 1D topologies, we show that a…
José A. R. Cembranos, Jorge Gigante Valcárcel, Francisco José Maldonado Torralba
'Francisco José Maldonado Torralba'] In this work we have studied the singular behaviour of gravitational theories with non symmetric connections. For this purpose we introduce a new criteria for the appearance of singularities based on the existence of black/white hole regions of arbitrary codimension defined inside a…
Michael I. Tribelsky, Boris Y. Rubinstein, José Antonio Sánchez-Gil
Singularities of the Poynting vector field subwavelength patterns in resonant light scattering by nanoparticles are discussed and classified. There are two generic types of the singularities, namely, (i) the singularities related to the vanishing of the magnetic (and/or electric) field at the singular points and (ii)…
Maba Boniface Matadi, K. S. Govinder
Tuberculosis (TB) is an airborne-transmitted disease and in human beings is caused by Mycobacterium tuberculosis bacteria (Mtb). Mtb droplets are released into the air by an infectious individual coughing and/or sneezing. Tubercle bacillus carried by such droplets live in the air for a short period of time [19] (about…
T. Tahamtan, Otakar Svítek
We analyze the persistence of curvature singularities when analyzed using quantum theory. First, quantum test particles obeying the Klein-Gordon and Chandrasekhar-Dirac equation are used to probe the classical timelike naked singularity. We show that the classical singularity is felt even by our quantum probes. Next…
J. W. Moffat
cosmology Authors: ['J. W. Moffat'] An approach is presented to address singularities in general relativity using a complex Riemannian spacetime extension. We demonstrate how this method can be applied to both black hole and cosmological singularities, specifically focusing on the Schwarzschild and Kerr black holes and…
Alexandre Erëmenko
Let f : D → G be a non-constant holomorphic map between Riemann surfaces. Let z0 be a point in D such that f ′ (z0) 6= 0. Then by the inverse function theorem there exists a neighborhood V of the point w0 = f(z0) and a holomorphic map φ : V → D, such that f ◦ φ = idV .
Simon Iveson, Kevin Galvin
This paper presents a simple relationship for estimating the uncertainty in the overall yield and species recovery when the two-product formula is applied to assays of the feed, product and tailings streams of a steady-state mineral separator. The non-linearity of the two-product formula means the reliability of these…
Zhe Weng, Yiyu Zhao, Zhiming Qing, Zhi-Cheng Ren + 4 more
The development of singular optics and vortex beams has facilitated numerous novel optical applications, with optical sensing being one prominent direction. By leveraging the rotational energy flow properties of vortex beams, rotational Doppler effect-based sensing for rotating objects has achieved significant…
Claudio A. Buzzi, Claudio Pessoa, João C. Medrado
Consider an analytical function f : V ⊂ R2 → R having 0 as its regular value, a switching manifold Σ = f −1 (0) and a piecewise analytical vector field X = (X+, X−), i.e. X± are analytical vector fields defined on Σ± = {p ∈ V : ±f(p) > 0}. We characterize when the vector field X has a monodromic singular point in Σ…
Peter De Maesschalck, Martin Wechselberger
We discuss the notion of excitability in 2D slow/fast neural models from a geometric singular perturbation theory point of view. We focus on the inherent singular nature of slow/fast neural models and define excitability via singular bifurcations. In particular, we show that type I excitability is associated with a…
Theodore Vo, Richard Bertram
Early afterdepolarizations (EADs) are pathological voltage oscillations in cardiomyocytes that have been observed in response to a number of pharmacological agents and disease conditions. Phase-2 EADs consist of small voltage fluctuations that occur during the plateau of an action potential, typically under conditions…
Justin Eilertsen, Santiago Schnell
As a case study, we consider a coupled (or auxiliary) enzyme assay of two reactions obeying the Michaelis-Menten mechanism. The coupled reaction consists of a single-substrate, single-enzyme non-observable reaction followed by another single-substrate, single-enzyme observable reaction (indicator reaction). In this…
M. Asaduzzaman Prodhan, Matthew Power, Monica Kehoe
Sequencing of a Polymerase Chain Reaction product (amplicon) is called amplicon sequencing. Amplicon sequencing allows for reliable identification of an organism by amplifying, sequencing, and analysing a single conserved marker gene or DNA barcode. As this approach generally involves a single gene, it is a…
Authors not listed
Purpose: The transmission Fourier-transform infrared (FTIR) spectrum contains complexed signals for molecular structures and intermolecular interactions. Their interrelated signals were attempted to be recognized using the singular value decomposition (SVD) procedure. Methods: Cimetidine (CIM) and indomethacin (INM)…
Authors not listed
Ongoing research involving electronic spin-dependent dynamics, such as chiral- induced spin selectivity, is providing impetus to revise our understanding of nuclear en- tanglement with electronic spatial and spin degrees of freedom. In a spin-independent setting, non-adiabatic couplings are well-known mediators of…
Jean Gaudart, Stanislas Rebaudet, Gaetan Texier, Robert Barrais + 2 more
The aim of the present study was to develop a method for multiscale analysis of non-stationary and non-periodic epidemic time series. Indeed, the epidemiologists may need to know the features, at different resolutions, of short duration outbreaks that did not exhibit periodic cycles. Among of the large number of…