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SIGMA 60-600mm f/4.5-6.3 DG DN OS Sport lens review
SIGMA 60-600mm f/4.5-6.3 DG DN OS Sport lens review Sigma’s 60-600mm Sport lens is one of the most versatile wildlife lenses around, but can its huge zoom range outweigh the heavy design? The Sigma 60-600mm f/4.5-6.3 DG DN Sport lens boasts one of the most versatile focal ranges on the market and effortlessly produces beautiful wildlife shots. The images are sharp, contrasty and true to life, but for us, the weight is a dealbreaker. - + Image quality is lovely - + Versatile focal length - +...
SIGMA 150-600mm f/5-6.3 DG DN OS Sport lens review
SIGMA 150-600mm f/5-6.3 DG DN OS Sport lens review How does this third-party lens compare to the native Sony equivalent? We tested both to see whether it’s worth going native or whether you should save your money. A very capable option for newer wildlife photographers looking for an affordable super-telephoto lens without sacrificing too much image quality. -
DG-CoLearn: An Efficient Collaborative Learning Framework for Dynamic Graphs
arXiv:2605.31427v1 Announce Type: new Abstract: Dynamic graph learning (DGL) is essential for modelling evolving graph data, but existing methods suffer from significant computational overhead due to repeated full-snapshot retraining and are not well-suited for collaborative settings with partitioned data. In realistic graph systems, cross-partition edges are unavoidable, but direct sharing of graph structure between clients may violate privacy constraints. We propose DG-CoLearn, a...
Embedded Trefftz DG method for reaction-diffusion problems on anisotropic meshes
Announce Type: new Abstract: We present and analyze an embedded Trefftz discontinuous Galerkin method for reaction-diffusion problems on anisotropic meshes. The method is constructed by imposing a relaxed local Trefftz condition via an embedding into a tensor-product DG space, yielding a reduced global system while preserving the approximation properties of the underlying high-order discretization. We prove stability and quasi-optimality on anisotropic, possibly curved, quadrilateral...
SC sets up expert panel on Aravalis, petitioners question its independence
New Delhi: In search of a new expansive definition of 'Aravali hills and ranges' after dropping the earlier court-accepted controversial 100m height criteria, Supreme Court has entrusted the task to a five-member high-powered committee that'll include experts from Indian Council of Forestry Research & Education, Forest Survey of India and Geological Survey of India. A bench of CJI Surya Kant and Justices Joymalya Bagchi and Vipul M Pancholi said while the DG of ICFRE will be ex-officio...
CPCANet: Deep Unfolding Common Principal Component Analysis for Domain Generalization
Announce Type: replace Abstract: Domain Generalization (DG) aims to learn representations that remain robust under out-of-distribution (OOD) shifts and generalize effectively to unseen target domains. While recent invariant learning strategies and architectural advances have achieved strong performance, explicitly discovering a structured domain-invariant subspace through second-order statistics remains underexplored. In this work, we propose CPCANet, a novel framework grounded in Common...
Numerical analysis of the second-order time-dependent saddle point Maxwell system via a parameter-free discontinuous Galerkin method: The first optimal ${\bf L}^{2}$-norm error estimates
Announce Type: new Abstract: We present a novel parameter-free discontinuous Galerkin (dG) finite element method (FEM) for the time-dependent Maxwell system formulated as a saddle point problem. We establish the stability of the proposed semi-discrete problem and derive optimal error estimates in energy and \( {\bf L}^{2} \) norms for the electric field variable, as well as in \( L^{2} \) norm for the potential function. To the best of our knowledge, this work provides the first optimal \(...
Optimal error estimates for a discontinuous Galerkin method on curved boundaries with polygonal meshes
Announce Type: replace Abstract: We consider a discontinuous Galerkin method for the numerical solution of boundary value problems in two-dimensional domains with curved boundaries. A key challenge in this setting is the potential loss of convergence order due to approximating the physical domain by a polygonal mesh. Unless boundary conditions can be accurately transferred from the true boundary to the computational one, such geometric approximation errors generally lead to suboptimal...
Stable Triangle Projections for Variable-Degree Tetrahedral Spaces and Uniform IPDG Preconditioning
Announce Type: new Abstract: The main ingredient of this paper is an edge-local variable-degree projection on a triangle that is uniformly stable in both L2 and H1. We use this two-dimensional operator in two tetrahedral constructions. First, on a reference tetrahedron, we build an H1-stable projection from a high order polynomial space onto a variable-degree space whose degrees are prescribed independently on edges, faces, and in the volume.
Ahoy, DECmate II the little PDP-8 that could
Now, that's a lot of word processing. But under the hood it's still at least PDP-8 adjacent, even considering its oddities and incompatibilities, and you can make it do many of the things a full-size Eight can. We'll take this basic unit, convert the floppy drives to solid state, tap the video output, and put it through its paces.