Results 21 to 30 of about 544,725 (129)

THE UTILIZATION OF AUGMENTED REALITY TECHNOLOGY IN DETERMINING QIBLA DIRECTION (ANALYSIS OF MIQAT APPLICATIONS BY SAMER JOUDI) [PDF]

open access: yes, 2023
Nowadays, around the world, there are numerous Qibla direction applications available on various websites and digital content providers. One of these is the Miqat application: Prayer Times, Qiblah, and Hilal Visibility, an augmented reality-based Android
Muttaqin, Naufal Fazal
core   +2 more sources

Density-Based Topology Optimization in Method of Moments: Q-factor Minimization

open access: yes, 2023
Classical gradient-based density topology optimization is adapted for method-of-moments numerical modeling to design a conductor-based system attaining the minimal antenna Q-factor evaluated via an energy stored operator.
Capek, Miloslav   +3 more
core   +1 more source

Long and short-range air navigation on spherical Earth [PDF]

open access: yes, 2017
Global range air navigation implies non-stop flight between any two airports on Earth. Such effort would require airplanes with the operational air range of at least 12,500 NM which is about 40-60% longer than anything existing in commercial air ...
Daidzic, Nihad E
core   +2 more sources

Spherical lignin particles: a review on their sustainability and applications

open access: yesGreen Chemistry, 2020
A critical review on spherical lignin nanoparticles highlighting aspects associated to their shape, performance in applications, sustainability, stability and degradation.
M. Österberg   +3 more
semanticscholar   +1 more source

Applications of numerical analysis in navigation [PDF]

open access: yes, 1994
Part one of the thesis contains analysis of the methods of computation in navigation. We start with loxodromic navigation and, although this subject is well documented, we make a positive attempt to analyse the subject matter using the methods of ...
Williams, Roy
core   +1 more source

Spherical orbits around a Kerr black hole [PDF]

open access: yesGeneral Relativity and Gravitation, 2020
A special class of orbits known to exist around a Kerr black hole are spherical orbits—orbits with constant coordinate radii that are not necessarily confined to the equatorial plane.
Edward Teo
semanticscholar   +1 more source

The Hess-Appelrot system and its nonholonomic analogs

open access: yes, 2016
This paper is concerned with the nonholonomic Suslov problem and its generalization proposed by Chaplygin. The issue of the existence of an invariant measure with singular density (having singularities at some points of phase space) is ...
Bizyaev, Ivan A.   +2 more
core   +1 more source

On conformal curves in 2-dimensional de sitter space [PDF]

open access: yes, 2015
In this paper, we examine the pseudo-spherical curves, which are equivalent to each other under the conformal maps preserving a fixed point in the de Sitter 2-space, by using the Clifford algebra Cl 2,1.
Özdemir, Mustafa, Şimşek, Hakan
core   +3 more sources

Size-controllable Synthesis of Uniform Spherical Covalent Organic Frameworks at Room Temperature for Highly Efficient and Selective Enrichment of Hydrophobic Peptides.

open access: yesJournal of the American Chemical Society, 2019
Covalent organic frameworks (COFs) represent a new class of porous crystalline polymers with a diversi-ty of applications. However, synthesis of uniform spherical COFs poses a great challenge.
Wende Ma   +6 more
semanticscholar   +1 more source

Wavelet-based directional analysis of the gravity field: evidence for large-scale undulations

open access: yes, 2012
International audienceIn the eighties, the analysis of satellite altimetry data leads to the major discovery of gravity lineations in the oceans, with wavelengths between 200 and 1400 km.
Davaille, A   +5 more
core   +3 more sources

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