Results 101 to 110 of about 4,101,445 (240)

Ultra-low SLL slotted waveguide antenna array using Chebyshev aperture distribution function for MM-wave tracking radar applications

Ain Shams Engineering Journal
A non-uniform aperture distribution slotted waveguide antenna is presented. The slotted waveguide antenna array is chosen for its ease for aperture distribution control and the flexibility of gain adjustment.
Basma M. Yousef, Allam M. Ameen, Ayman Elboushi   +2 more
doaj   +1 more source

On convergence of convex sets and relative Chebyshev centers

Journal of Approximation Theory, 1990
For a Banach space X denote by CB(X) the family of all nonvoid closed bounded subsets of X equipped with the Hausdorff topology \(\tau_ H\), and by CC(X) the family of all nonvoid closed convex subsets of X equipped with a weaker topology \(\tau_ M\), called the Mosco topology [\textit{U. Mosco}, Adv. Math. 3, 510-585 (1969; Zbl 0192.491)].
BEER, G, PAI, D
openaire   +3 more sources

NAADF: Globally Illuminated Voxel Worlds Accelerated with Nested Axis‐Aligned Distance Fields

Computer Graphics Forum, EarlyView.
Abstract Achieving realistic rendering of 3D scenes in real time using path tracing is challenging due to the high sample count required, with ray tracing as the bottleneck. Focusing on voxels as a geometry representation offers significant opportunities for optimizations, especially for tracing the rays, but also for computing the samples.
A. Ulschmid, M. Ott, J. Macho, M. Wimmer, S. Ohrhallinger   +4 more
wiley   +1 more source

Chaotic Quantum Double Delta Swarm Algorithm Using Chebyshev Maps: Theoretical Foundations, Performance Analyses and Convergence Issues

Journal of Sensor and Actuator Networks, 2019
The Quantum Double Delta Swarm (QDDS) Algorithm is a networked, fully-connected novel metaheuristic optimization algorithm inspired by the convergence mechanism to the center of potential generated within a single well of a spatially colocated double ...
Saptarshi Sengupta, Sanchita Basak, Richard Alan Peters   +2 more
doaj   +1 more source

Miners' Reward Elasticity and Stability of Competing Proof‐of‐Work Cryptocurrencies

International Economic Review, EarlyView.
ABSTRACT Proof‐of‐Work cryptocurrencies employ miners to sustain the system through algorithmic reward adjustments. We develop a stochastic model of the multicurrency mining and identify conditions for stable transaction speeds. Bitcoin's algorithm requires hash supply elasticity <$<$1 for stability, while ASERT remains stable for any elasticity and ...
Kohei Kawaguchi, Junpei Komiyama, Shunya Noda   +2 more
wiley   +1 more source

Comparison of Inductive and Capacitive End Couplings in the Design of a Combline Microwave Cavity Filter for the E1 Galileo Band [PDF]

Advances in Radio Science
Inductive and capacitive end couplings in the design of combline microwave filters are compared. For instance, a combline microwave cavity filter for the E1 Galileo band (1559–1591 MHz, 2 % fractional bandwidth) is considered.
E. Boni, G. Giannetti, S. Maddio, G. Pelosi   +3 more
doaj   +1 more source

Unconditional Variance Estimation Under Complex Surveys

International Statistical Review, EarlyView.
Summary The unconditional framework treats the samples and the variables of interest as random variables. This is particularly suitable with analytic inference, when modelling survey data. We show that variance estimation does not involve finite population corrections and joint‐inclusion probabilities, even with large sampling fractions and under ...
Yves G. Berger
wiley   +1 more source

Waveguide-Type Directional Coupler Based on Substrate Integrated Waveguide (SIW) [PDF]

Journal of Intelligent Procedures in Electrical Technology, 2012
Substrate Integrated Waveguide (SIW) is a new type of guided wave structure which could be implemented in both microwave and millimeter wave integrated circuits.
Zohreh Pourgholamhossein, Reza Safian
doaj  

On Chebyshev centers in Banach spaces

In this note, we observe that $X\in (GC)$ if $X$ admits Chebyshev center for any finite set in it. This answers the problem raised by Veselý, addressed in [{\em Generalized centers of finite sets in Banach spaces}, Acta Math. Univ. Comenian. (N.S.) {\bf 66}(1) (1997), 83--115].
Das, Syamantak, Paul, Tanmoy
openaire   +2 more sources

Chebyshev centers and some geometric properties of Banach spaces

Journal of Mathematical Analysis and Applications, 2017
Let \(X\) be a real Banach space, \(\emptyset\neq V\subset X\) closed and \(\emptyset\neq F\subset X\) bounded. For \(v\in V\) and \(\delta >0\) put \(r(v,F)=\sup\{\|v-x\| : x\in F\}\), \(\mathrm{rad}_V(F)=\inf\{r(v,F) : v\in V\}\) (the Chebyshev radius of \(F\) with respect to \(V\)), \(\mathrm{cent}_V(F)=\{v\in V : v(v,F)= \mathrm{rad}_V(F)\}\) (the ...
Lalithambigai, S., Paul, T., Shunmugaraj, P., Thota, V.   +3 more
openaire   +3 more sources