Results 71 to 80 of about 101,682 (286)

Surface Tension Measurement of Ti‐6Al‐4V by Falling Droplet Method in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this article, the temperature‐dependent surface tension of free falling, oscillating Ti‐6Al‐4V droplets is investigated in both argon and monosilane doped, oxygen‐free atmosphere. Droplet temperature and oscillation are captured with one single high‐speed camera, and the surface tension is calculated with Rayleigh's formula.
Johannes May, Finn‐Lennard Janthur, Lena Kreie, Michael Müller, Sarah Seffer, Nick Schwarz, Jörg Hermsdorf, Thomas Hassel, Stefan Kaierle, Ludger Overmeyer   +9 more
wiley   +1 more source

Locating helicopter ambulance bases in Iceland: efficient and fair solutions

Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine, 2023
Background Fixed-wing air ambulances play an important role in healthcare in rural Iceland. More frequent use of helicopter ambulances has been suggested to shorten response times and increase equity in access to advanced emergency care.
Björn Gunnarsson, Kristrún María Björnsdóttir, Sveinbjörn Dúason, Ármann Ingólfsson   +3 more
doaj   +1 more source

Optimal randomized incremental construction for guaranteed logarithmic planar point location [PDF]

, 2014
Given a planar map of $n$ segments in which we wish to efficiently locate points, we present the first randomized incremental construction of the well-known trapezoidal-map search-structure that only requires expected $O(n \log n)$ preprocessing time ...
Halperin, Dan, Hemmer, Michael, Kleinbort, Michal   +2 more
core  

Maximal Covering Location Problem and Bimatrix Games

TEM Journal
The problem of optimally locating service centers to maximize customer coverage within a specified distance remains both theoretically significant and practically relevant. This article presents a game-theoretic approach to solving such location-allocation problems, offering a comprehensive framework that identifies all viable facility configurations ...
Zuzana Čičková, Allan Jose Sequeira Lopez   +1 more
openaire   +1 more source

A probabilistic analysis of the maximal covering location problem

Discrete Applied Mathematics, 1993
Under a variety of different random models of the maximal covering location problem, we show that the relativ error of a randomly generated solution converges to zero in expectation as problem size grows. We prove similar results for the relative error between the optimal integer and fractional solutions to the problem.
Vohra, Rakesh V., Hall, Nicholas G.
openaire   +2 more sources

In Situ Constructed Magnetic Core‐Shell Hydrogen‐Bonded Organic Framework‐on‐Metal–Organic Framework Structure: an Efficient Catalyst for Peroxymonosulfate Activation

Advanced Functional Materials, EarlyView.
In this work, a magnetic core‐shell catalyst (HOF‐on‐Fe3O4/ZIF‐67) is successfully synthesized, consisting of a metal–organic framework (ZIF‐67) with magnetic Fe3O4 as the core and a porous hydrogen‐bonded organic framework (HOF) as the shell. The catalyst efficiently activated peroxymonosulfate, resulting in rapid and effective removal of water ...
Yingying Du, Chenhui Ding, Chao Deng, Susanta Banerjee, Seema Agarwal   +4 more
wiley   +1 more source

A Bi-Objective Mathematical Programming Model for a Maximal Covering Hub Location Problem Under Uncertainty

SAGE Open
Properly locating these facilities is a substantial factor in the success of the logistics systems. In this paper, a bi-objective mathematical model for a maximal covering hub location problem is presented to minimize time and environmental risks.
Mohammad Khalilzadeh, Mahsa Ahmadi, Omid Kebriyaii   +2 more
doaj   +1 more source

Understanding and Optimizing Li Substitution in P2‐Type Sodium Layered Oxides for Sodium‐Ion Batteries

Advanced Functional Materials, EarlyView.
This work explores Li‐substituted P2 layered oxides for Na‐ion batteries by crystallographic and electrochemical studies. The effect of lithium on superstructure orderings, on phase transitions during synthesis and electrochemical cycling and on the interplay of O‐ versus TM‐redox is revealed via various advanced techniques, including semi‐simultaneous 
Mingfeng Xu, Giovanni Gammaitoni, Michael Häfner, Eduardo Villalobos‐Portillo, Carlo Marini, Matteo Bianchini   +5 more
wiley   +1 more source

A New Heuristic Solution Method for Maximal Covering Location-Allocation Problem with M/M/1 Queueing System [PDF]

Journal of Sciences, Islamic Republic of Iran, 2012
We consider the queueing maximal covering location-allocation problem (QM-CLAP) with an M/M/1 queueing system. We propose a new solution procedure based on decomposition of the problem into smaller sub-problems.
F. Moeen Moghadas
doaj  

Improved Implementation of Point Location in General Two-Dimensional Subdivisions

, 2012
We present a major revamp of the point-location data structure for general two-dimensional subdivisions via randomized incremental construction, implemented in CGAL, the Computational Geometry Algorithms Library. We can now guarantee that the constructed
D.G. Kirkpatrick, D.P. Dobkin, D.T. Lee, E. Berberich, E. Flato, F.P. Preparata, H. Edelsbrunner, J. Snoeyink, K. Mulmuley, N. Sarnak, O. Devillers, R. Seidel, R. Seidel   +12 more
core   +2 more sources