INVESTIGATION OF GYROELECTRIC WAVEGUIDES WITH ANISOTROPIC DIELECTRIC LAYER / GIROELEKTRINIŲ BANGOLAIDŽIŲ SU ANIZOTROPINIU DIELEKTRIKO SLUOKSNIU TYRIMAS

In this paper the open, circular cross-section cylindrical gyro- electric p-GaAs (semiconductor-dielectric) waveguides with temperature-sensitive anisotropic dielectric layer are investigated. The gyroelectric phase shifters without anisotropic dielectric layer are not effective. The anisotropic layer increases the mode HE11 differential phase shift to 1060° and 1250°, when temperature T = (125–200) K, N = 5∙1019 and N = 1020 m–3 respectively. Propagated mode HE11 in gyroelectric p-GaAs waveguides, the attenuation coefficient increases, increasing the concentration of holes. The anisotropic dielectric layer reduces the mode attenuation, it is appropriate to create gyroelectric mode phase shifters with a lower hole concentration and anisotropic dielectric layer. Tiriami atvirieji, apskritojo skerspjūvio cilindriniai, giroelektriniai p-GaAs (puslaidininkiniai-dielektriniai) bangolaidžiai su jautriais temperatūrai puslaidininkine šerdimi ir anizotropiniu dielektriko sluoksniu. Šis sluoksnis padidina hibridinių pagrindinio tipo HE11 bangų diferencinį fazės pokytį iki 1060° ir 1250°, kylant temperatūrai (125–200) K ruože, kai puslaidininkio skylučių koncentracija N atitinkamai yra 5∙1019 m–3 ir 1020 m–3. Giroelektriniuose p-GaAs bangolaidžiuose HE11 bangų silpimo koeficientas didėja, didinant skylučių koncentraciją, bet anizotropinio dielektriko sluoksnis mažina bangų silpimą. Todėl, kuriant temperatūra valdomus giroelektrinius bangų fazės keitiklius, tikslinga naudoti bangolaidžius su mažesnės koncentracijos skylutėmis ir jautriu temperatūrai anizotropinio dielektriko sluoksniu.

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Postbuckling Analysis for the Bending of a Long Beam With a Thin, Open, Circular Cross Section

Journal of Applied Mechanics ◽

10.1115/1.3168981 ◽

1985 ◽

Vol 52 (1) ◽

pp. 129-132 ◽

Cited By ~ 2

Author(s):

R. C. Benson

Keyword(s):

Cross Section ◽

Circular Cross Section ◽

Bending Moment ◽

Order Effect ◽

Multiple Equilibrium ◽

Loading Path ◽

Postbuckling Behavior ◽

Imperfection Sensitivity ◽

Equilibrium Configurations ◽

Open Circular

A longitudinal bending moment applied to a thin, open section beam induces limit point buckling, due to a second-order effect that flattens the leaves of the cross section. It is shown here, for the case of a circular cross section, that the leaves themselves may exhibit multiple equilibrium configurations. Thus, the postbuckling behavior of the beam is not uniquely defined, and perturbations may shift the system to an unexpected loading path. In this paper, the various equilibrium configurations are examined and judged for stability. A “perfect” bifurcating geometry is identified, and a form of imperfection sensitivity is observed.

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Phase Characteristics of Models of GaAs Gyroelectric Waveguides with Temperature Sensitive Anisotropic Dielectric Layers in Case of One Layer

Electrical Control and Communication Engineering ◽

10.2478/ecce-2018-0016 ◽

2018 ◽

Vol 14 (2) ◽

pp. 134-140

Author(s):

Darius Plonis ◽

Andrius Katkevičius ◽

Diana Belova-Plonienė

Keyword(s):

Dielectric Layer ◽

Temperature Sensitive ◽

Anisotropic Dielectric ◽

Free Carriers ◽

Coupled Mode ◽

Wave Phase ◽

Dielectric Layers ◽

Partial Area ◽

Density Of Electrons ◽

Complex Dispersion

AbstractModels of open cylindrical multilayer gyroelectric-anisotropic-gyroelectric waveguides are presented in this paper. The influence of density of free carriers, temperature and the presence of the external dielectric layer on the wave phase characteristics of the models of n-GaAs waveguides has been evaluated. Differential Maxwell’s equations, coupled mode and partial area methods have been used to obtain complex dispersion equation of the models of gyroelectric-anisotropic-gyroelectric waveguides with or without the temperature sensitive external anisotropic dielectric layer. The analysis has shown that the phase characteristics are practically unchanged when the density of electrons is equal to N = (1017–5·1018) m−3, d/rs = 0, the changes of wave phase coefficients are obtained in the models of waveguides with the external anisotropic dielectric layer. The largest differences of wave phase coefficient are obtained when the density of electrons is N = 1021 m−3. The external dielectric layer improves the control of gyroelectric n-GaAs waveguides with temperature.

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SAF file: It's really three dimensional file

Mustansiria Dental Journal ◽

10.32828/mdj.v14i1.744 ◽

2018 ◽

Vol 14 (1) ◽

pp. 1

Author(s):

Prof. Dr. Jamal Aziz Mehdi

Keyword(s):

Cross Section ◽

Root Canal ◽

Three Dimensional ◽

Circular Cross Section ◽

Circular Motion ◽

Root Canal Treatment ◽

Metal Core ◽

Rotating Blade

The biological objectives of root canal treatment have not changed over the recentdecades, but the methods to attain these goals have been greatly modified. Theintroduction of NiTi rotary files represents a major leap in the development ofendodontic instruments, with a wide variety of sophisticated instruments presentlyavailable (1, 2).Whatever their modification or improvement, all of these instruments have onething in common: they consist of a metal core with some type of rotating blade thatmachines the canal with a circular motion using flutes to carry the dentin chips anddebris coronally. Consequently, all rotary NiTi files will machine the root canal to acylindrical bore with a circular cross-section if the clinician applies them in a strictboring manner

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