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Tuesday, July 14, 2020 | History

2 edition of **Validation of an accurate three-dimensional helical slow-wave circuit model** found in the catalog.

Validation of an accurate three-dimensional helical slow-wave circuit model

Carol L. Kory

- 246 Want to read
- 35 Currently reading

Published
**1997**
by National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, National Technical Information Service, distributor] in [Washington, D.C.], [Springfield, Va
.

Written in English

- Electric waves.,
- Impedance (Electricity),
- Traveling-wave tubes.,
- Wave guides -- Mathematical models.

**Edition Notes**

Other titles | Validation of an accurate three dimensional helical slow wave circuit model |

Statement | Carol L. Kory. |

Series | NASA contractor report -- 4766, NASA contractor report -- NASA CR-4766. |

Contributions | Lewis Research Center., United States. National Aeronautics and Space Administration. Scientific and Technical Information Program. |

The Physical Object | |
---|---|

Pagination | i, 39 p. : |

Number of Pages | 39 |

ID Numbers | |

Open Library | OL19286054M |

Significant wave height (H s) is a basic parameter in wave characterization, important for different problems in marine activities such as the design and management of vessels, marine structures, and wave energy converters.H s is usually estimated using in-situ sensors, mainly buoys, that record time series of wave elevation information. In this paper we propose a method for H s estimation The three‐dimensional scalar wave equation is separable in 11 distinct coordinate systems, but complete solutions of the vector wave equation in a form directly applicable to the solution of boundary‐value problems are at present known only for certain separable systems of cylindrical coordinates and for spherical ://

Circuit Effective Permittivity and Measurement of Characteristic Impedance 3. Waveguide Circuit Theory Traveling Wave Intensities Pseudo-Waves Voltage Standing Wave Ratio Scattering and Pseudo-Scattering Matrices The Cascade Matrix The Impedance Matrix Abstract A methodology for quantitative, directional validation of a long-term wave model hindcast is described and applied. Buoy observations are

IN THREE-DIMENSIONAL EXCITABLE MEDIA MATTHEW DOWLE, ROLF MARTIN MANTEL and DWIGHT BARKLEY Mathematics Institute, University of Warwick, Coventry CV4 7AL UK Received January 6, ; Revised Febru A fast numerical scheme based on the model of Barkley [Physica 49D (), 61] is extended to three space dimensions (3D) The response of the circuit is plotted in Fig. (b). At t = 0, when a step voltage V is applied as input to the high-pass circuit, as the capacitor will not allow any sudden changes in voltage, it behaves as a short circuit. Hence, the input voltage V appears at the output. As the input remains constant, the charge on the ECE - PDC UNIT -

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Validation of an Accurate Three-Dimensional Helical Slow-Wave Circuit Model eBook: National Aeronautics and Space Administration NASA: : Kindle Store Validation of an accurate three-dimensional helical slow-wave circuit model under contract NAS (SuDoc NAS ) [Carol L.

Kory] on *FREE* shipping on qualifying :// Get this from a library. Validation of an accurate three-dimensional helical slow-wave circuit model: under contract NAS [Carol L Kory; United States.

National Aeronautics and Space Administration. Scientific and Technical Information Program.] The tape-helix model is used to analyze the helical slow-wave structure considering the helix turns to be effectively shorted by the resistive attenuator coating on dielectric helix-support :// Validation of an Accurate Three-Dimensional Helical Slow-Wave Circuit Model The helical slow-wave circuit embodies a helical coil of rectangular tape supported in a metal barrel by dielectric A spectral wave model can be tested in two ways.

First, the model can be used to simulate the evolution of wave spectrum with fetch or duration for stationary, uniform wind fields. Ä more revealing test would be to determine the model’s ability to specify the directional wave spectrum for realistic wind fields that vary in space and :// Slow Wave Helical Resonator James F.

Corum, Ph.D. Department of Electrical Engineering The resulting model not only predicts the resonant behavior of the The authors believe that the most fruitful way to characterize the ‘Extra Coil’ is as a distributed circuit or loaded transmission line, and not in terms of lumped circuit 's_Extra_Coil_pdf.

† Numerical validation and high-order scattering analysis Supporting Information: † Readme † Text S1 and Figures S1–S5 Correspondence to: C. Wu, [email protected] Citation: Wu, C., X. Zhang, G. Fang, J. Shi, and S. Liu (), An accurate and fast forward model of three-dimensional electromagnetic wave scattering in a Two kinds of novel helical slow wave circuit, supported by Chemical Vapor Deposition (CVD) diamond, are presented.

They are applying in miniaturized millimeter wave helical traveling wave tube. Cold test characteristic of these circuits are simulated by MAFIA :// PROPERTIES OF HELICAL AND MEANDER SLOW-WAVE SYSTEMS SUMMARY OF DOCTORAL DISSERTATION TECHNOLOGICAL SCIENCES, ELECTRICAL AND ELECTRONIC ENGINEERING (01T) Vilnius Doctoral dissertation was prepared at Abstract: In this paper, results of different models are compared for calculating effective, cold-circuit (beam-free) phase velocities and interaction impedances of folded waveguide (FW) slow wave circuits for use in millimeter-wave traveling wave tubes (TWT).

These parameters are needed for one-dimensional (1-D) parametric model simulations of FW traveling wave tubes (FWTWTs). Accurate Parametric Electrical Model for Slow-Wave CPW and Application to Circuits Design Abstract: In this paper, a predictive electrical model of the slow-wave coplanar waveguide structure (S-CPW) is presented.

The model was developed under the assumption of Quasi-TEM propagation mode. This assumption allows treating separately the electric ?tp=&arnumber= 2. The WAM model - The WAM model is the first model that solves the energy balance equation, including non-linear wavewave interactions.

Energy balance for wind sea - Distinction between wind sea and swell. Empirical growth curves: fetch and duration limitation. Energy balance for wind sea according to the WAM model.

Evolution of wave :// model [15] from a curved dielectric waveguide (approximately a plane curve) with a rectangular cross section to a helical waveguide (a space curved waveguide for an arbitrary value of the step’s angle and the radius of the cylinder of the helical waveguide) with a rectangular cross section.

Figure 1 shows the geometry of the helical waveguide Colomba Di Blasi, in Biomass for Energy and the Environment, CONCLUSIONS AND FURTHER DEVELOPMENTS. Numerical model has been applied to investigate the different regimes and characteristics of cellulosic material pyrolysis.

Indirect heating is associated with a pure kinetic control (very small particle sizes and/or very slow external heat transfer rates) or to a heat transfer :// varying wave drift load is needed to model systems with low natural periods such as a large moored ship.

These wave drift loads are a second order wave e ect. In monochromatic waves, a body experiences a low magnitude mean (steady) wave drift load. The mean wave drift load arises from the combination of the rst order wave loads and the rst Acoustics 1 The Two Dimensional Numerical Modeling Of Acoustic Wave Propagation in Shallow Water Ahmad Zakaria1, John Penrose1, Frank Thomas1 and Xiuming Wang2 1 Centre for Marine Science and Technology, Curtin University of Technology.2CSIRO Petroleum.

Abstract This paper describes progress on a two dimensional numerical simulation of acoustic wave propagation With the growing number of velocity models constructed with different tomographic methods and seismic data sets, there is an increasing need for a systematic way to validate model accuracy and resolution.

This study selects five shear wave velocity models in the U.S. and simulates full‐wave propagation within the 3‐D :// 5 Model Validation and Prediction. INTRODUCTION. From a mathematical perspective, validation is the process of assessing whether or not the quantity of interest (QOI) for a physical system is within some tolerance—determined by the intended use of the model—of the model :// The kinematic-wave model is one of a number of ap proximations of the dynamic-wave model.

The dynamic- wave model describes one-dimensional shallow-water waves (unsteady, gradually varied, open-channel flow) and consists of the continuity equation and the equa tion of motion with appropriately prescribed initial and boundary ://. A Three-Dimensional Numerical Model for Wave-Induced Transient Pore Pressure around the Head of a Breakwater.

Dong-Sheng Jeng* and Jian Li. School of Civil Engineering, The University of Sydney, New South WalesAustralia. *Corresponding author.

Abstract. The wave-induced pore pressure in marine sediment around a coastal structure hasHi Steve, I did this over 2 years ago and I don't think I used an equation plus it was when I dabbled with Solidworks I'm a NX user.

If you have Solidworks just open the file and check it out for ://#! Hence, worepresents an outgoing wave. – The wave fronts of wiare the spheres r+ct= k, contracting as time goes on. Hence, wirepresents an incoming wave.

The Cauchy Problem 1. Fundamental Solution (n=3) and Strong Huygens’ Principle. • In this section we consider the global Cauchy problem for the three-dimensional homogeneous wave equation *PDE_1/wave/higher_dimensions/dimension=2,