Einige Bemerkungen über die Erzeugung von elektromagnetischen Wanderwellen und stehenden Wellen zur induktiven Plasmabeschleunigung

Abstract Some comments are made for the generation of e.m. travelling and standing waves used for in-ductive plasma acceleration. Resulting from a simple mathematical formulation the different features lead to a non-conventional method for travelling wave generation, which is compared with the basic method - i. e. the standing wave generation - with regard to Ohmic losses and mag-netic energy density

Download Full-text

Induktive Plasmabeschleunigung mit nicht-sinusförmigen stehenden elektromagnetischen Wellen / Inductive Plasma Acceleration with Non-Sinusoidal Elektromagnetic Standing Waves

Zeitschrift für Naturforschung A ◽

10.1515/zna-1974-0106 ◽

1974 ◽

Vol 29 (1) ◽

pp. 45-50

Author(s):

R. Köhne ◽

A. Meert

Keyword(s):

Standing Wave ◽

Standing Waves ◽

Numerical Calculations ◽

Acceleration Process ◽

Plasma Velocity ◽

Plasma Acceleration ◽

Velocity Measurements ◽

Inductive Acceleration ◽

New Type ◽

Experimental Values

Some types of standing r. f. waves are compared and discussed. As a result a new type of a non-sinusoidal standing wave is proposed which leads to an improved inductive acceleration system. Plasma velocity measurements have been carried out on this system. Numerical calculations are made for the plasma acceleration process and compared with the experimental values of the velocity. The theory as well as the advantage of the proposed system is verified by the results.

Download Full-text

Waveguide and antenna coupled travelling-wave 1.55-μm photodetectors for optical (sub)millimeter-wave generation

10.1117/12.548966 ◽

2004 ◽

Cited By ~ 4

Author(s):

Andrei Malcoci ◽

Andreas Stohr ◽

Andres Sauerwald ◽

Sven Schulz ◽

Dieter Jager

Keyword(s):

Millimeter Wave ◽

Travelling Wave ◽

Wave Generation

Download Full-text

Interaction Between Coriolis Forces and Mistuning on a Cyclic Symmetric Structure With Geometrical Nonlinearity

Volume 11: Structures and Dynamics: Structural Mechanics, Vibration, and Damping; Supercritical CO2 ◽

10.1115/gt2020-15343 ◽

2020 ◽

Author(s):

Anthony Tacher ◽

Fabrice Thouverez ◽

Jason Armand

Keyword(s):

Standing Wave ◽

Geometrical Nonlinearity ◽

Numerical Approach ◽

Travelling Wave ◽

Lumped Parameter Model ◽

Coriolis Forces ◽

High Speeds ◽

Symmetric Structure ◽

Lumped Parameter ◽

Cyclic Symmetric

Abstract An investigation of the interaction between Coriolis forces and mistuning on a cyclic symmetric structure is presented in this paper. The sensitivity of the eigenvalues and eigenvectors to mistuning is first studied with the perturbation method. A lumped parameter model is used to perform a modal analysis using a numerical approach after which geometrical nonlinearity is added to compare behavior with the linear case. Two different modes are thoroughly investigated for different rotational speeds, the first with an eigenvalue isolated from the others and the second presenting a frequency veering zone. The evolution from a standing wave domination at low speeds to a travelling wave domination at high speeds is observed for the isolated mode, whereas a standing wave domination remains around the veering zone for the second mode studied. It is also shown that the geometrical nonlinearity reinforces the mistuning effect versus the Coriolis forces.

Download Full-text

Travelling Wave Generation of Wrinkles on the Hydrogel Surfaces

Macromolecular Rapid Communications ◽

10.1002/marc.202100848 ◽

2022 ◽

pp. 2100848

Author(s):

Yuka Kashihara ◽

Taka‐Aki Asoh ◽

Hiroshi Uyama

Keyword(s):

Travelling Wave ◽

Wave Generation

Download Full-text

Instability of standing waves for non-linear Schrödinger-type equations

Ergodic Theory and Dynamical Systems ◽

10.1017/s014338570000938x ◽

1988 ◽

Vol 8 (8) ◽

pp. 119-138 ◽

Cited By ~ 46

Keyword(s):

Dynamical Systems ◽

Standing Wave ◽

Optical Waveguides ◽

Standing Waves ◽

Positive Eigenvalue ◽

Shooting Argument ◽

Wave Solutions ◽

Non Linear ◽

Linearized Operator

AbstractA theorem is proved giving a condition under which certain standing wave solutions of non-linear Schrödinger-type equations are linearly unstable. The eigenvalue equations for the linearized operator at the standing wave can be analysed by dynamical systems methods. A positive eigenvalue is then shown to exist by means of a shooting argument in the space of Lagrangian planes. The theorem is applied to a situation arising in optical waveguides.

Download Full-text

PEMODELAN FORMULA MATEMATIK UNTUK MENENTUKAN NILAI BUKU AKTIVA TETAP DAN ALGORITMANYA DALAM BAHASA PEMROGRAMAN QUICK BASIC

EKUITAS (Jurnal Ekonomi dan Keuangan) ◽

10.24034/j25485024.y2007.v11.i1.2228 ◽

2017 ◽

Vol 11 (1) ◽

pp. 136

Author(s):

Yudha Herlambang

Keyword(s):

Conventional Method ◽

Mathematical Formulation ◽

First Year ◽

Computer Language ◽

Book Value ◽

Final Value ◽

Basic Software ◽

Fixed Assets ◽

Useful Life ◽

Accounting Principle

According to General Accepted Accounting Priciples (GAAP), we realize that Fix Assets have been used during periodic useful live which be allocated for cost was called Deppreciation Cost .For the Fixed Assets which be depreciated will result the final Value of the Assets mentioned Book Value. The Book Value of Fix Assets in the first year was called the Historical Cost.The Book Value in each periodcan be calculated by using conventional method, we can make the tabulation chronologically until the end of useful life. In this paper, the author will design the mathematical formulation for determining the Book Value Directly at the year-t or Book Value Equation referred to the function t(time) without tabulation process, for each depreciation method used in Accounting Principle .In other side, the author will also design the programming and algorithm in Computer Language by using Quick Basic Software. And the last the author will test the validity of program and mathematic formulation by comparing the result with the result of conventional method (tabulation method).

Download Full-text

Simulation of a Layered Resonator for a Microfluidic Ultrasonic Separator

ASME 4th International Conference on Nanochannels, Microchannels, and Minichannels, Parts A and B ◽

10.1115/icnmm2006-96247 ◽

2006 ◽

Author(s):

Yijun Shen ◽

Mark A. Atherton

Keyword(s):

Energy Density ◽

Pressure Distribution ◽

Standing Wave ◽

Acoustic Pressure ◽

Separation Performance ◽

Experimental Measurements ◽

Driving Frequency ◽

Stored Energy ◽

Acoustic Characteristics ◽

Small Spherical Particle

This paper focuses on the simulation of a layered resonator for a microfluidic ultrasonic separator with a special emphasis on analysing the stored energy-frequency product in the microfluid chamber. Since the acoustic force acting on a small spherical particle in a standing wave in the cavity of an ultrasonic separator is proportional to the product of the energy density in the standing wave and the driving frequency, the energy-frequency product can be used as a prediction of the separation performance in an ultrasonic separator. The electro-acoustic characteristics of the resonator under different conditions are also investigated. In particular, the influence of the reflector thickness on the stored energy-frequency product of the layered resonator is examined. Furthermore, the acoustic pressure distribution in the fluid chamber of the ultrasonic separator is investigated in detail. Predicted results from simulations compare well with experimental measurements and show that the model can be used to predict the electro-acoustic characteristics and the separation performance.

Download Full-text

On the observability of finite-depth short-crested water waves

Journal of Fluid Mechanics ◽

10.1017/s0022112096002686 ◽

1996 ◽

Vol 322 ◽

pp. 1-19 ◽

Cited By ~ 10

Author(s):

M. Ioualalen ◽

A. J. Roberts ◽

C. Kharif

Keyword(s):

Standing Wave ◽

Water Waves ◽

Numerical Study ◽

Standing Waves ◽

Finite Depth ◽

Two Dimensional ◽

Wave Fields ◽

Progressive Waves ◽

Wave Limit ◽

Narrow Bands

A numerical study of the superharmonic instabilities of short-crested waves on water of finite depth is performed in order to measure their time scales. It is shown that these superharmonic instabilities can be significant-unlike the deep-water case-in parts of the parameter regime. New resonances associated with the standing wave limit are studied closely. These instabilities ‘contaminate’ most of the parameter space, excluding that near two-dimensional progressive waves; however, they are significant only near the standing wave limit. The main result is that very narrow bands of both short-crested waves ‘close’ to two-dimensional standing waves, and of well developed short-crested waves, perturbed by superharmonic instabilities, are unstable for depths shallower than approximately a non-dimensional depth d= 1; the study is performed down to depth d= 0.5 beyond which the computations do not converge sufficiently. As a corollary, the present study predicts that these very narrow sub-domains of short-crested wave fields will not be observable, although most of the short-crested wave fields will be.

Download Full-text