scholarly journals Mode Identification Using Photometry and Spectroscopy

2004 ◽  
Vol 193 ◽  
pp. 466-469
Author(s):  
Joris De Ridder ◽  
Conny Aerts ◽  
Marc-Antoine Dupret
Keyword(s):  
Moment Method ◽  
Amplitude Ratios ◽  
Stepwise Approach ◽  
Mode Identification ◽  
New Variant ◽  
Additional Mode ◽  
Mode Discrimination ◽  
Multi Mode

AbstractWe tested a stepwise approach to combine photometry and spectroscopy for mode identification where we first used the photometric amplitude ratios to restrict the degree l, then did a spectroscopic mode identification, and finally fitted the photometric amplitudes to restrict the list of candidate modes. For the spectroscopic mode identification, we implemented an efficient multi-mode moment method variant. We conclude that this new variant works well, but that the photometric amplitudes are too model sensitive to do any additional mode discrimination.

scholarly journals The Slowly Pulsating B Star HD 147394

2002 ◽  
Vol 185 ◽  
pp. 234-235
Author(s):  
M. Briquet ◽  
A. Noels ◽  
C. Aerts ◽  
P. Mathias
Keyword(s):  
Moment Method ◽  
Mode Identification ◽  
The Moment

AbstractHD 147394 is a Slowly Pulsating B star for which we found three periods in the moments of the Si II 4128-4130 lines: f1 = 0.8008 c/d, f2 = 0.7813 c/d and f3 = 0.6710 c/d. A mode identification is perform ed by using the moment method.

scholarly journals Multisite spectroscopic and photometric observations of the pulsating sdB star PG 1605+072

2004 ◽  
Vol 193 ◽  
pp. 230-233
Author(s):  
S.J. O’Toole ◽  
S. Falter ◽  
U. Heber ◽  
C.S. Jeffery ◽  
S. Dreizier ◽  
...  
Keyword(s):  
Amplitude Ratios ◽  
Data Set ◽  
Velocity Amplitude ◽  
Mode Identification ◽  
Horizontal Branch Stars ◽  
Massive Data Set ◽  
Photometric Observations ◽  
First Results ◽  
Formation And Evolution ◽  
Phase Differences

AbstractWe present the first results from the MultiSite Spectroscopic Telescope (MSST) observations of the sdBV star PG 1605+072. Pulsating sdB stars (V361 Hya stars) offer the chance to gain new insights into the formation and evolution of extreme Horizontal Branch stars using the tools of asteroseismology. PG 1605+072 is an outstanding object in its class, with the richest frequency spectrum, the longest periods, and the largest variations. The MSST campaign took place in 2002 May/June and we present here the massive data set, made up of 399 hr of photometry and 151 hr of spectroscopy. The overall aims of the project are to examine light/velocity amplitude ratios and phase differences, changes in equivalent width/line index, and λ-dependence of photometric amplitudes, and to use these properties for mode identification.

scholarly journals Thermal Reflow Effect in Multi-mode Waveguide of S-Bend Resonator with Mode Discrimination

2022 ◽  
pp. 1-1
Author(s):  
Yong-Jin Kim ◽  
Seok-Ho Hong ◽  
Jae-Sang Lee ◽  
Su-Jin Jeon ◽  
Woo June Choi ◽  
...  
Keyword(s):  
Mode Discrimination ◽  
Thermal Reflow ◽  
Multi Mode

scholarly journals Mode Identification in Pulsating Stars

1994 ◽  
Vol 162 ◽  
pp. 75-86
Author(s):  
C. Aerts
Keyword(s):  
High Resolution ◽  
Moment Method ◽  
Spectroscopic Methods ◽  
Mode Identification ◽  
Pulsating Stars ◽  
The Past ◽  
Photometric Observations ◽  
The Moment ◽  
Identification Techniques

During the past twenty years, different methods have been developed to identify the modes in non-radially pulsating stars. Before the introduction of high-resolution spectrographs with sensitive detectors, identifications were obtained from photometric observations. More recently, mode identification is obtained by means of spectroscopic methods. In this paper, we present an overview of the different mode-identification techniques currently used and we describe their accuracy to identify the modes present in different kinds of pulsating stars. By means of some applications of the moment method, we show that this method deserves far more attention than it has received until now.

Single perineal opening with ‘H-type’ cecovesical fistula and blind-ending foreshortened distal colon: a new variant of persistent cloaca

2021 ◽  
Vol 14 (3) ◽  
pp. e236364
Author(s):  
Rahul Saxena ◽  
Manish Pathak ◽  
Arvind Sinha ◽  
Jayakumar Kesavulu Thummalapati
Keyword(s):  
Urinary Tract ◽  
Genital Tract ◽  
Distal Colon ◽  
Common Channel ◽  
Stepwise Approach ◽  
Persistent Cloaca ◽  
Blind Ending ◽  
New Variant ◽  
Müllerian Agenesis ◽  
Novel Variation

Persistent cloaca is a rare and severe variety of anorectal malformation, which is more common in females and includes a spectrum of abnormalities. The urinary tract, genital tract and rectum open into a common channel, which exteriorises as a single perineal opening. We are reporting a patient with a novel variation in the classical anatomy of the cloaca. The child has a short blind-ending colon with a cecovesical fistula associated with mullerian agenesis and lipomyelomeningocoele. The child is being managed in a stepwise approach and she has completed the anal reconstruction. Here, we discuss this novel variation in anatomy and challenges in its management.

scholarly journals Multivariate Sensor Data Analysis for Oil Refineries and Multi-mode Identification of System Behavior in Real-time

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 64389-64405 ◽  
Author(s):  
Athar Khodabakhsh ◽  
Ismail Ari ◽  
Mustafa Bakir ◽  
Ali Ozer Ercan
Keyword(s):  
Data Analysis ◽  
Real Time ◽  
Sensor Data ◽  
System Behavior ◽  
Mode Identification ◽  
Oil Refineries ◽  
Multi Mode

scholarly journals Novel S-Bend Resonator Based on a Multi-Mode Waveguide with Mode Discrimination for a Refractive Index Sensor

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3600 ◽  
Author(s):  
Do-Hyun Kim ◽  
Su-Jin Jeon ◽  
Jae-Sang Lee ◽  
Seok-Ho Hong ◽  
Young-Wan Choi
Keyword(s):  
Refractive Index ◽  
Single Mode ◽  
Higher Order ◽  
Optical Resonators ◽  
Refractive Index Sensor ◽  
Bending Loss ◽  
Wide Line ◽  
Mode Discrimination ◽  
The Difference ◽  
Multi Mode

In this paper, a multi-mode waveguide-based optical resonator is proposed for an integrated optical refractive index sensor. Conventional optical resonators have been studied for single-mode waveguide-based resonators to enhance the performance, but mass production is limited owing to the high fabrication costs of nano-scale structures. To overcome this problem, we designed an S-bend resonator based on a micro-scale multi-mode waveguide. In general, multi-mode waveguides cannot be utilized as optical resonators, because of a performance degradation resulting from modal dispersion and an output transmission with multi-peaks. Therefore, we exploited the mode discrimination phenomenon using the bending loss, and the resulting S-bend resonator yielded an output transmission without multi-peaks. This phenomenon is utilized to remove higher-order modes efficiently using the difference in the effective refractive index between the higher-order and fundamental modes. As a result, the resonator achieved a Q-factor and sensitivity of 2.3 × 103 and 52 nm/RIU, respectively, using the variational finite-difference time-domain method. These results show that the multi-mode waveguide-based S-bend resonator with a wide line width can be utilized as a refractive index sensor.

A tutorial on a multi-mode identification procedure based on the complex-curve fitting method

2022 ◽  
pp. 107754632110576
Author(s):  
Victor T Noppeney ◽  
Thiago Boaventura ◽  
Klaus Medeiros ◽  
Paulo Varoto
Keyword(s):  
Modal Analysis ◽  
Curve Fitting ◽  
Parameter Extraction ◽  
Modal Identification ◽  
Rational Fraction ◽  
Polynomial Method ◽  
Complex Curve ◽  
Mode Identification ◽  
Depth Analysis ◽  
Multi Mode

Modal identification is a key step in modal analysis. It enables the researcher to extract modal parameters, such as natural frequency, amplitude, and damping from a given structure. There are a considerable number of techniques in the state of the art aiming to address this problem, where multi-mode approaches arise as an appealing choice due to their ability to deal with mode coupling. This tutorial paper focuses on the complex-curve fitting technique, originally conceived for an application distinct from modal analysis. It aims at guiding other researchers by providing a tutorial-like and in-depth analysis of this important method, associated with a nonlinear weighting procedure for improved precision. Additionally, this paper fills a gap on the original technique, which is limited to the ratio of two polynomials, by proposing an automatic parameter extraction technique. The original and improved methods are applied on both simulated and experimental data, highlighting the effectiveness of the proposed changes. The proposed procedure is also compared with the rational fraction polynomial method.

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