scholarly journals CONDUCTING SHEATH HELICAL WINDING ON THE CORE-CLADDING INTERFACE OF A LIGHTGUIDE HAVING A PIET HEIN SUPER ELLIPTICAL CORE CROSS-SECTION AND A STANDARD OPTICAL FIBER OF CIRCULAR CROSS-SECTION-A COMPARATIVE MODAL ANALYSIS

2006 ◽  
Vol 59 ◽  
pp. 231-249 ◽  
Author(s):  
Vivek Singh ◽  
S. N. Maurya ◽  
B. Prasad ◽  
Sant Prasad Ojha
Keyword(s):  
Optical Fiber ◽  
Modal Analysis ◽  
Cross Section ◽  
Circular Cross Section ◽  
The Core ◽  
Helical Winding ◽  
Elliptical Core

scholarly journals Cross-Sectional Geometry and the Intermetallics Structure in a High Pressure Die Cast Mg-Al Alloy

2010 ◽  
Vol 638-642 ◽  
pp. 1579-1584 ◽  
Author(s):  
A.V. Nagasekhar ◽  
Carlos H. Cáceres ◽  
Mark Easton
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Rectangular Cross Section ◽  
Circular Cross Section ◽  
Al Alloy ◽  
Cross Sectional ◽  
The Core ◽  
Die Cast ◽  
Increased Strength ◽  
Scanning Electron

Specimens of rectangular and circular cross section of a Mg-9Al binary alloy have been tensile tested and the cross section of undeformed specimens examined using scanning electron microscopy. The rectangular cross sections showed three scales in the cellular intermetallics network: coarse at the core, fine at the surface and very fine at the corners, whereas the circular ones showed only two, coarse at the core and fine at the surface. The specimens of rectangular cross section exhibited higher yield strength in comparison to the circular ones. Possible reasons for the observed increased strength of the rectangular sections are discussed.

On Deformation of the Injection Mold Core

2008 ◽  
Vol 44-46 ◽  
pp. 85-89
Author(s):  
J.J. Jia ◽  
Zheng Hao Ge ◽  
Y. Li
Keyword(s):  
Finite Element ◽  
Cross Section ◽  
Rectangular Cross Section ◽  
Special Section ◽  
Circular Cross Section ◽  
Injection Molding Process ◽  
Injection Mold ◽  
Molding Process ◽  
Finite Element Software ◽  
The Core

For injection mold with core, during the injection molding process, the pressure on the core is usually uneven and will cause the core to deform. In this paper, on the basis of some predigestions and assumptions of the model, formulas for forecasting the deformation of the circular cross-section and the rectangular cross-section cores under three different injection ways are analyzed. The theoretical analysis results of a core with special section are validated through finite element software. At the end, some suggestions are given to minish the core deformation when the calculation value is too large.

scholarly journals A Perturbative Method for Calculating the Impedance of Coils on Laminated Ferromagnetic Cores

2010 ◽  
Vol 2010 ◽  
pp. 1-24 ◽  
Author(s):  
Serguei Maximov ◽  
Allen A. Castillo ◽  
Vicente Venegas ◽  
José L. Guardado ◽  
Enrique Melgoza
Keyword(s):  
Perturbation Theory ◽  
Cross Section ◽  
Thermal Effects ◽  
Maxwell’S Equations ◽  
Maxwell's Equations ◽  
Circular Cross Section ◽  
The Self ◽  
The Core ◽  
Perturbative Method ◽  
Excellent Accuracy

A new set of formulas for calculating the self and mutual impedances of coils on straight and closed laminated ferromagnetic cores of circular cross-section has been derived. The obtained formulas generalize the well-known formulas for impedances of coils on homogeneous ferromagnetic cores, for the case of laminated cores, and improve the previously known formulas for laminated cores. The obtained formulas are fully consistent with Maxwell's equations and, therefore, offer an excellent accuracy. The perturbation theory and the average field technique are used to solve Maxwell's equations inside and outside the core. The solution inside the core can also be used in the analysis of thermal effects occurring inside the laminated core.

Finite Extension of an Elastic Strand With a Central Core

1978 ◽  
Vol 45 (4) ◽  
pp. 852-858 ◽  
Author(s):  
N. C. Huang
Keyword(s):  
Cross Section ◽  
Circular Cross Section ◽  
Single Layer ◽  
Finite Extension ◽  
Contact Forces ◽  
Central Core ◽  
The Core ◽  
Axial Forces ◽  
Helical Angle ◽  
Curved Rods

This paper deals with the finite extension of an elastic strand with a central core surrounded by a single layer of helical wires subjected to axial forces and twisting moments. The central core is considered as a straight rod of circular cross section and the helical wires are regarded as slender curved rods with circular cross section. The theory of slender curved rods is used in the analysis. Geometrical nonlinearities due to the reductions in helical angle and cross section of the core and wires are included. It is found that as a result of the contact between the central core and helical wires, a separation between helical wires can occur during the extension of the strand. Stresses in the core and wires as well as the contact forces between the core and wires are analyzed for strands with various helical angles subjected to different axial forces. Examples are presented for the finite extension of strands with fixed ends and strands with free ends.

Laser Enhanced Direct Print Additive Manufacturing of Embedded Circular Cross-Section Optical Fiber Interconnects for Board Level Computing Devices

2020 ◽  
Vol 34 ◽  
pp. 101227
Author(s):  
Roger B. Tipton ◽  
Dianhao Hou ◽  
Eduardo A. Rojas-Nastrucci ◽  
Thomas M. Weller ◽  
Venkat R. Bhethanabotla
Keyword(s):  
Additive Manufacturing ◽  
Optical Fiber ◽  
Cross Section ◽  
Circular Cross Section ◽  
Board Level

Study on a Preparation of PS Hollow Submicro-Fiber by Coaxial Electrospinning

2013 ◽  
Vol 652-654 ◽  
pp. 228-233
Author(s):  
Tai Qi Liu ◽  
Dan Lv ◽  
Xiao Long Zhao ◽  
Ning Gao ◽  
Na Zhao
Keyword(s):  
Drug Release ◽  
Cross Section ◽  
Circular Cross Section ◽  
Average Diameter ◽  
Gas Storage ◽  
Coaxial Electrospinning ◽  
Outer Flow ◽  
The Core ◽  
Polymer Liquids ◽  
Storage Energy

Coaxial electrospinning has been recognized as an efficient technique for fabrication of composite fibers with especial circular cross-section in a diameter from micrometers to nanometers. In this paper, PS hollow submicro-fibers have been successfully prepared by electrospinning two polymer liquids through a coaxial, two spinneret, followed by selective removal of the core. Moreover, the influence of the relative (inner-to-outer) flow rate on the morphology and the average diameter of the fibers have been studied. The hollow submicro-fibers are particularly attractive for use in catalysis, purification, separation, gas storage, energy conversion, drug release, sensing, and environmental protection.

The velocity of a vortex ring with a thin core of elliptical cross section

1980 ◽  
Vol 370 (1742) ◽  
pp. 407-415 ◽  
Keyword(s):  
Vortex Ring ◽  
Cross Section ◽  
Constant Angular Velocity ◽  
Mean Velocity ◽  
Dimensional Solution ◽  
Cross Sectional ◽  
Elliptical Cross ◽  
The Core ◽  
Elliptical Core ◽  
Axis Of Symmetry

The motion of a circular vortex ring with a thin elliptical core is considered. The core is untwisted so that the vortex ring is axisymmetric and the vorticity in the core is proportional to distance from the axis of symmetry. The core rotates with a constant angular velocity comparable to the circulation frequency, as in Kirchoff’s two-dimensional solution. The velocity of the ring, suitably defined, is periodic and the average velocity is Γ/4π R [ln(16 R / a + b )-¼], where Γ is the circulation around the core, a and b are the semi-major and semi-minor axes of the core cross section and R is the radius of the ring. This mean velocity is smaller than the velocity of translation of a ring of the same radius and circulation but with a circular core of the same-cross-sectional area.

scholarly journals Dynamics of Laser-Induced Shock Wave in Silica/ Dynamika Laserowa Indukowana W Fali Uderzeniowej W Krzemionce

2014 ◽  
Vol 59 (4) ◽  
pp. 1599-1603 ◽  
Author(s):  
V.P. Efremov ◽  
A.A. Frolov ◽  
E.M. Dianov ◽  
I.A. Bufetov ◽  
V.E. Fortov
Keyword(s):  
Shock Wave ◽  
Optical Fiber ◽  
Cross Section ◽  
Energy Deposition ◽  
Laser Intensity ◽  
Published Data ◽  
Fiber Glass ◽  
Damage Propagation ◽  
The Core ◽  
Laser Induced Damage

Abstract The study of detonation-like mode of laser induced damage propagation was considered. Velocity of this propagation is two orders of magnitude faster than known published data on burning fiber glass. The condition of optical fiber and enough long laser pulse let us obtain laser induced damage propagation passing near hundred own core diameters during pulse. The using as target the core of silica-based optical fiber has some diagnostic advantages. It allows spatially splits “start” and “stop” points and to supply the same form of energy deposition in every cross section of optical fiber. Tested regime demonstrates near constant velocities during 250 ns in the range of laser intensity 2-4.5 GW/cm2.

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