investigations on vibration behaviors of railway track systems were attempted in this research. this was made by conducting a comprehensive field investigation into the free vibration of track systems and response of tracks to train moving loads. in-situ modal analysis was used in a railway track field as an efficient method of investigating dynamic properties of railway track systems. natural ...

Videos are rich in multimedia content and semantics, which should be used by video browsers to better present the audio-visual information to the viewer. Ubiquitous video players allow for content to be scanned linearly, rarely providing summaries or methods for searching. Through analysis of audio and video tracks, it is possible to extract text transcripts from audio, displayed text from vide...

The paper illustrates a procedure based on the continuous-wavelet transform (CWT) for the analysis of current transients due to line faults. Considering roundly reliability and accuracy of one terminal fault location system for transmission lines, a single-ended continuous wavelet Transform (CWT) based fault location algorithm has been presented in this paper. Wavelet transform is a powerful ma...

Abstract: Modal analysis is a powerful technique for understanding the behavior and performance of structures. Modal analysis can be conducted via artificial excitation, e.g. shaker or instrument hammer excitation. Input force and output responses are measured. That is normally referred to as experimental modal analysis (EMA). EMA consists of three steps: data acquisition, system identificatio...

This paper details the limitations in transmission distances suffered by laser-based Gigabit networks operating near a wavelength of 1300nm over multimode fibers. The discussion focuses on the relationship between the actual fiber modal bandwidth and various launch conditions. Fundamental Concepts of Multimode Fibers Multimode fiber simply refers to the fact that numerous modes or light rays ar...

An efficient time second-order characteristic finite element method for solving the nonlinear multi-component aerosol dynamic equations is developed. While a highly accurate characteristic method is used to treat the advection multi-component condensation/evaporation process, a time high-order extrapolation along the characteristics is applied to approximate the nonlinear multi-component coagul...

Jankov (characteristic) formulas were introduced 50 years ago in [7] and proved to be a very useful tool for studying a broad range of logics, e.g. intermediate, modal, fuzzy, relevant, many-valued, etc. All these different logics have one thing in common: in one or the other form they admit the deduction theorem. From the standpoint of algebraic logic it means that their corresponding varietie...

A perturbation theoretic approach is proposed as an efficient characterization tool for a tapered fiber coupled ultrahigh-quality factor Q toroidal microcavity with a small inverse aspect ratio. The Helmholtz equation with an assumption of quasi-TE/TM modes in local toroidal coordinates is solved via a power series expansion in terms of the inverse aspect ratio and the expanded eigenmode soluti...

Abstract The dynamic characteristics of high-speed counter-current chromatography (HSCCC) have a significant impact on its separation efficiency and equipment stability. accurate discrimination the characteristic during process constitutes prerequisite for clarifying mechanism performance improvement. This study establishes HSCCC operational modal model using least-square complex frequency doma...