Results 61 to 70 of about 1,264,340 (305)
Geometric optics and instability for semi-classical Schrodinger equations
, 2005 We prove some instability phenomena for semi-classical (linear or) nonlinear Schrodinger equations. For some perturbations of the data, we show that for very small times, we can neglect the Laplacian, and the mechanism is the same as for the ...
A. Majda +25 more
core +5 more sources
Extrinsic curvature, geometric optics, and lamellar order on curved substrates. [PDF]
Physical review. E, Statistical, nonlinear, and soft matter physics, 2009 When thermal energies are weak, two-dimensional lamellar structures confined on a curved substrate display complex patterns arising from the competition between layer bending and compression in the presence of geometric constraints.
R. Kamien +3 more
semanticscholar +1 more source
Advanced Engineering Materials, EarlyView.This study investigates laser shock peening for enhancing fatigue performance of riveted aerospace aluminum joints. A comparative approach with cold expansion combines fatigue testing and synchrotron X‐ray methods. Integrating mechanical testing with residual stress and strain characterization provides insights into how different treatments affect the ...
Ogün Baris Tapar +6 more
wiley +1 more source
Geometric optics of whispering gallery modes
, 2006 Quasiclassical approach and geometric optics allow to describe rather accurately whispering gallery modes in convex axisymmetric bodies. Using this approach we obtain practical formulas for the calculation of eigenfrequencies and radiative Q-factors in ...
Fomin, Aleksey E. +1 more
core +2 more sources
Black-hole quasinormal resonances: Wave analysis versus a geometric-optics approximation [PDF]
, 2009 It has long been known that null unstable geodesics are related to the characteristic modes of black holes--the so-called quasinormal resonances. The basic idea is to interpret the free oscillations of a black hole in the eikonal limit in terms of null ...
S. Hod
semanticscholar +1 more source
Advanced Engineering Materials, EarlyView.Excellent combinations of strength and impact toughness are obtained in a bilayer composite of high‐strength carbide‐free bainitic (CFB) steel and high‐ductility twinning‐induced plasticity (TWIP) steel. The composite absorbs energy at small strains when the notch is placed on the TWIP side and at high strains when the notch is placed on the CFB side ...
Kendra Hawke +5 more
wiley +1 more source
, 2013 We present an abstract method in the setting of compact metric spaces which is applied to solve a number of problems in geometric optics. In particular, we solve the one source near field refraction problem.
Gutierrez, Cristian E., Huang, Qingbo
core +1 more source
Advanced Engineering Materials, EarlyView.This study reports the fabrication of trabecular bioactive glass scaffolds (composition “1d”: 46.1SiO2‐28.7CaO‐8.8MgO‐6.2P2O5‐5.7CaF2‐4.5Na2O wt%) through vat photopolymerization and the relevant results from mechanical testing and in vivo implantation procedures in rabbit femora, showing great promise for bone tissue engineering applications.
Dilshat Tulyaganov +8 more
wiley +1 more source
Determination of Angle of Refraction in X-Ray Phase-Contrast Imaging Using Geometric Optics Method
PhotonicsThe accurate calculation of the angle of refraction of X-rays passing through an object is essential in X-ray phase-contrast imaging. While the wave optics-based method is commonly employed to calculate the angle of refraction, it presents several ...
Jun Yang +4 more
doaj +1 more source
Item analysis: basic concepts of physics students in geometric optics
Gravity: Jurnal Ilmiah Penelitian dan Pembelajaran Fisika, 2020 The purpose of this study was to analyze students' items and abilities—the analysis for mapping test instruments and students' basic concepts regarding optics subjects before lectures are held. The test participants were 35 physics students. The analysis
Godelfridus Hadung Lamanepa +2 more
doaj +1 more source