Spherical invisibility cloak with minimum number of layers of isotropic materials

2012 ◽  
Vol 54 (9) ◽  
pp. 2217-2220 ◽  
Author(s):  
Tiago Carvalho Martins ◽  
Victor Dmitriev
Keyword(s):  
Isotropic Materials ◽  
Number Of Layers ◽  
Invisibility Cloak ◽  
Minimum Number

Optimized cylindrical invisibility cloak with minimum layers of non-magnetic isotropic materials

2011 ◽  
Vol 44 (18) ◽  
pp. 185102 ◽  
Author(s):  
Zhenzhong Yu ◽  
Yijun Feng ◽  
Xiaofei Xu ◽  
Junming Zhao ◽  
Tian Jiang
Keyword(s):  
Isotropic Materials ◽  
Invisibility Cloak

scholarly journals Quantum “Ghosts”

2016 ◽  
Vol 38 (3) ◽  
Author(s):  
Gabriela M. Amaral ◽  
David Q. Aruquipa ◽  
Ludwing F. M. Camacho ◽  
Luiz F. C. Faria ◽  
Sofía I. C. Guzmán ◽  
...  
Keyword(s):  
Quantum Mechanics ◽  
Graduate Students ◽  
State University ◽  
Alphabetical Order ◽  
Text Book ◽  
Invisibility Cloak ◽  
Minimum Number ◽  
General Scientific ◽  
One Year ◽  
The One

Can you pick a complex subject in quantum mechanics and discuss it with a minimum number of equations, in a simplified form that the general scientific public could understand? This was a question presented to graduate students of the one-year Quantum Mechanics course based on the text book Modern Quantum Mechanics by J. J. Sakurai and Jim Napolitano, at the State University of Campinas (UNICAMP), Brazil. The first seven authors of this paper are graduate students (alphabetical order) that accepted to try it. The chosen subject was “delocalized quantum states”, and it will be discussed using colloquial terms like quantum ghosts, spooky action, splitting beings and invisibility cloak.

Application of curved layer manufacturing for preservation of randomly located minute critical surface features in rapid prototyping

2015 ◽  
Vol 21 (6) ◽  
pp. 725-734 ◽  
Author(s):  
Yashpal Patel ◽  
Aashish Kshattriya ◽  
Sarat B Singamneni ◽  
A. Roy Choudhury
Keyword(s):  
Rapid Prototyping ◽  
Computer Aided Design ◽  
Critical Surface ◽  
Adaptive Slicing ◽  
Content Type ◽  
Surface Features ◽  
Number Of Layers ◽  
Thin Slices ◽  
Minimum Number ◽  
Pass Through

Purpose – Layered manufacturing with curved layers is a recently proposed rapid prototyping (RP) strategy for the manufacture of curved, thin and shell-type parts and the repair of worn surfaces, etc. The present investigation indicates another possible application area. In case of flat-layered RP of computer-aided design models having randomly located, small-dimensioned but critical surface features, adaptive slicing is resorted to. Large number of thin slices have to be employed to preserve the critical features. In contrast, a considerably lower number of curved thin slices would be required to preserve such surface features in case of RP with curved layers. Design/methodology/approach – The method of preservation of critical features by RP with curved layers is formulated and demonstrated for two clusters of critical features on the surface of a part. A minimum number of such curved layers is identified by application of genetic algorithms (GAs) in case of a simple example. GA evolves the shape of the curved layer passing through the lower cluster so as to make a curved layer pass through the upper cluster of critical features. Findings – In the example part, a 21 per cent reduction in the number of layers is achieved by the application of adaptive curved layers over adaptive straight layers. Originality/value – The novelty of the concept is the proposed use of curved layered RP with adaptive slicing for the preservation of critical features in final prototyped part. This methodology, applied to part with two distinct clusters, leads to reduced number of layers compared to that obtained in flat-layered RP.

Electromagnetic soundings in the sedimentary basin of southern Ontario—A case history

Geophysics ◽  
1983 ◽  
Vol 48 (3) ◽  
pp. 311-330 ◽  
Author(s):  
E. Gómez‐Trevino ◽  
R. N. Edwards
Keyword(s):  
Apparent Resistivity ◽  
Sedimentary Basin ◽  
Joint Inversion ◽  
Earth Model ◽  
Electrical Model ◽  
Southern Ontario ◽  
Number Of Layers ◽  
Electromagnetic Soundings ◽  
Minimum Number ◽  
The Individual

The results of electrical and electromagnetic (EM) soundings conducted in the sedimentary basin of southern Ontario are presented. The sounding sites are located strategically to take advantage of the dipping nature of the sediments, a progressive study being undertaken from shallow to deep sections. The vertical magnetic field transfer function, estimated with a pseudonoise source EM system, and conventional Schlumberger apparent resistivity are jointly inverted. For each site, the layered earth model containing the minimum number of layers is fitted to the data. The joint inversion enables up to eight distinct layers to be identified at some sites. The nonuniquenesses or ambiguities in each model, for example S (conductivity‐thickness product) equivalence of a deep thin conductive layer, are revealed through an eigensolution analysis. The intrinsic ambiguities of the models of the deeper sections are resolved by a systematic, progressive site‐to‐site correlation of electrical units across the basin. For example, the conductivity of a conductive unit is measurable when it is at a shallow depth. In a deeper section, if the unit appears as a thin layer, it is assigned this value of conductivity removing the S‐equivalence ambiguity. The individual inversions combined with the site‐to‐site correlation produce an overall electrical model of the basin consistent with the known geologic section.

Upward Drawings of Trees on the Minimum Number of Layers

2008 ◽  
pp. 88-99 ◽  
Author(s):  
Md. Jawaherul Alam ◽  
Md. Abul Hassan Samee ◽  
Md. Mashfiqui Rabbi ◽  
Md. Saidur Rahman
Keyword(s):  
Number Of Layers ◽  
Minimum Number

scholarly journals Numerical and Experimental Comparative Analysis of Ballistic Performance of Packages Made of Biaxial and Triaxial Kevlar 29 Fabrics

2020 ◽  
Vol 20 (2) ◽  
pp. 203-219 ◽  
Author(s):  
Justyna Pinkos ◽  
Zbigniew Stempien
Keyword(s):  
Comparative Analysis ◽  
Experimental Research ◽  
Ballistic Performance ◽  
Residual Velocity ◽  
Maximum Deformation ◽  
Number Of Layers ◽  
Minimum Number ◽  
Work Structure ◽  
Distribution Of Stress ◽  
Ballistic Trauma

AbstractThe objective of this study is a comparative analysis of the ballistic effectiveness of packages made of biaxial and triaxial Kevlar 29 fabrics under the hitting of Parabellum 9×19 bullet. We conduct both numerical simulations using the LS-Dyna program and experimental research in a ballistic research laboratory. Based on the comparative analysis of the results from the numerical and experimental research, demonstrated differences exist in the ballistic effectiveness between the packages made of biaxial fabrics and the packages consisting of triaxial fabrics. For this purpose, the residual velocity of the bullet is analyzed in detail in terms of the maximum deformation cone, the shape of the deformation cone, and the distribution of stress for the textile ballistic packages. It is established that the packages made of triaxial fabric show a considerably smaller deformation cone compared with the packages made of biaxial fabric, a more favorable shape of the deformation cone from the perspective of ballistic trauma and distribution of stress similar to materials with isotropic properties. Poorer properties are recorded for these packages in the case of the minimum number of layers necessary for stopping the bullet, which arises from the open-work structure of the fabric.

scholarly journals Synthesis of Conveying Machine Satisfying Minimum Number of Layers.

1997 ◽  
Vol 63 (611) ◽  
pp. 2490-2495
Author(s):  
Yoshihiro SAKAMOTO ◽  
Kiyoshi OGAWA
Keyword(s):  
Number Of Layers ◽  
Minimum Number
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