scholarly journals Direct 2D spatial-coherence determination using the Fourier-analysis method: multi-parameter characterization of the P04 beamline at PETRA III

2020 ◽  
Vol 28 (5) ◽  
pp. 7282 ◽  
Author(s):  
Kai Bagschik ◽  
Jochen Wagner ◽  
Ralph Buß ◽  
Matthias Riepp ◽  
André Philippi-Kobs ◽  
...  
Keyword(s):  
Fourier Analysis ◽  
Spatial Coherence ◽  
Analysis Method

scholarly journals Enabling time-resolved 2D spatial-coherence measurements using the Fourier-analysis method with an integrated curved-grating beam monitor

2020 ◽  
Vol 45 (19) ◽  
pp. 5591
Author(s):  
Kai Bagschik ◽  
Michael Schneider ◽  
Jochen Wagner ◽  
Ralph Buss ◽  
Matthias Riepp ◽  
...  
Keyword(s):  
Fourier Analysis ◽  
Spatial Coherence ◽  
Analysis Method ◽  
Time Resolved ◽  
Beam Monitor

scholarly journals Real-time CMR Fourier Analysis for Temporospatial Characterization of Ventricular Wall Motion in Health and Disease

2021 ◽  
Author(s):  
Yu Yulee Li ◽  
Shams Rashid ◽  
Jason Craft ◽  
Yang J. Cheng ◽  
William Schapiro ◽  
...  
Keyword(s):  
Fourier Analysis ◽  
Healthy Volunteers ◽  
Real Time ◽  
Resting State ◽  
Wall Motion ◽  
Spatial Coherence ◽  
Ventricular Wall ◽  
Ventricular Wall Motion ◽  
Temporal Periodicity

Abstract Background Cardiovascular magnetic resonance (CMR) has been largely dependent on retrospective cine for image acquisition. Real-time imaging, although inferior in image quality to retrospective cine, is advantageous in examining temporospatial behaviors of cardiac motion over a series of sequential cardiac cycles. The presented work is a proof-of-concept of assessing cardiac function quantitatively with novel temporospatial indices in real-time CMR. Methods Fourier analysis was introduced for temporospatial characterization of real-time CMR signals arising from ventricular wall motion. Two quantitative indices, temporal periodicity and spatial coherence, were provided for function assessment in the left ventricle (LV) and right ventricle (RV). We prospectively investigated these temporospatial indices in a CMR study with healthy volunteers and heart failure (HF) patients. Results Real-time images were collected and analyzed in 12 healthy volunteers during exercise and at rest, and also in 12 HF patients at rest. The statistics indicated that the healthy volunteers presented an increase of temporal periodicity due to ventricular response to exercise (resting-state 0.24 ± 0.037 vs. exercising-state 0.31 ± 0.040 in LV; resting-state 0.18 ± 0.030 vs. exercising-state 0.25 ± 0.038 in RV; P < 0.001 for both). The HF patients gave lower temporal periodicity (0.14 ± 0.021 for LV; 0.10 ± 0.014 for RV; P < 0.001 for both) than that in the healthy volunteers. The spatial coherence of LV and RV wall motion was also lower in the HF patients than that in the healthy volunteers (0.38 ± 0.040 vs 0.52 ± 0.039 for LV; 0.35 ± 0.035 vs. 0.50 ± 0.036 for RV; P < 0.001 for both). Both temporal periodicity and spatial coherence were found to be correlated to end-systolic volume (ESV) and ejection-fraction (EF) (R > 0.6, P < 0.001). However, the HF patients and healthy volunteers were well differentiated in the scatter plots of spatial coherence and temporal periodicity while they were mixed in those of ESV and EF. Conclusions Real-time CMR Fourier analysis enables a new approach to quantitative assessment of cardiac function with temporal periodicity and spatial coherence. The temporospatial characterization of real-time CMR images has the potential for intricate analysis of ventricular wall motion beyond conventional methods.

Characterization of Antibacterial-Producing Endophytic Fungi of Syzygiumpolyanthum Leaves

2020 ◽  
Vol 20 (4) ◽  
pp. 448-454
Author(s):  
Rahmita Burhamzah ◽  
Gemini Alam ◽  
Herlina Rante
Keyword(s):  
Molecular Characterization ◽  
Endophytic Fungi ◽  
Morphological Characterization ◽  
Test Method ◽  
Analysis Method ◽  
Nitrogen Base ◽  
Rdna Genes ◽  
Antibacterial Screening ◽  
Planting Method

Background: Endophytic fungi live in plants’ tissue and can produce the same bioactive compounds as its host plant produces. Syzygiumpolyanthum leaves have known to be one of the antibacterial compound producers. Aim and Objective: This study aimed to characterize morphologically, microscopically, and molecularly the antibacterial-producing endophytic fungi of Syzygiumpolyanthum leaves. Methods: The isolation of endophytic fungi was done by fragment planting method on PDA medium. The antibacterial screening was performed using the antagonistic test as the first screening followed by the disc diffusion test method. The morphological characterization was based on isolate’s mycelia color, growth pattern, margin, and surface texture of the colony, while the microscopic characterization was based on its hyphae characteristics. The molecular characterization of the isolate was done by nitrogen base sequence analysis method on nucleotide constituent of ITS rDNA genes of the isolate. Results: The results found that isolate DF1 has antibacterial activity against E.coli, S.aureus, P.acne, and P.aeruginosa, with the greatest inhibition at 10% concentration of broth fermentation extract on S.aureus with a diameter of inhibition of 13.77 mm. Conclusion: Based on macroscopic, microscopic, and molecular characterization, DF1 isolate is similar to Ceriporialacerate.

Characterization of left atrial appendage Doppler flow in atrial fibrillation and flutter by Fourier analysis

1996 ◽  
Vol 132 (2) ◽  
pp. 286-296 ◽  
Author(s):  
Richard A. Grimm ◽  
Shalabh Chandra ◽  
Allan L. Klein ◽  
William J. Stewart ◽  
Ian W. Black ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Fourier Analysis ◽  
Left Atrial ◽  
Left Atrial Appendage ◽  
Atrial Appendage ◽  
Doppler Flow ◽  
Atrial Fibrillation And Flutter

scholarly journals 3D Characterization of Sponge Cake as Affected by Freezing Conditions Using Synchrotron X-ray Microtomography at Negative Temperature

Foods ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 2915
Author(s):  
Amira Zennoune ◽  
Pierre Latil ◽  
Fatou-Toutie Ndoye ◽  
Frederic Flin ◽  
Jonathan Perrin ◽  
...  
Keyword(s):  
Negative Temperature ◽  
Ice Formation ◽  
Analysis Method ◽  
Image Analysis Method ◽  
Sponge Cake ◽  
X Ray ◽  
Before And After ◽  
Shape Characterization ◽  
Fast Freezing

In this study, the microstructural evolution of a non-reactive porous model food (sponge cake) during freezing was investigated. Sponge cake samples were frozen at two different rates: slow freezing (0.3 °C min−1) and fast freezing (17.2 °C min−1). Synchrotron X-ray microtomography (µ-CT) and cryo-scanning electron microscopy (Cryo-SEM) were used to visualize and analyze the microstructure features. The samples were scanned before and after freezing using a specific thermostated cell (CellStat) combined with the synchrotron beamline. Cryo-SEM and 3D µ-CT image visualization allowed a qualitative analysis of the ice formation and location in the porous structure. An image analysis method based on grey level was used to segment the three phases of the frozen samples: air, ice and starch. Volume fractions of each phase, ice local thickness and shape characterization were determined and discussed according to the freezing rates.

High-Throughput Characterization of Composition and Performance of Titanium Alloys Based on Nanoindentation Technology and EPMA

2021 ◽  
Vol 871 ◽  
pp. 20-26
Author(s):  
Yu Gao ◽  
Hong Yu ◽  
Yu Zhou ◽  
Xin Jie Zhu ◽  
Qun Bo Fan
Keyword(s):  
Titanium Alloy ◽  
High Throughput ◽  
Alloy Composition ◽  
Analysis Method ◽  
Experimental Scheme ◽  
Test Efficiency ◽  
And Performance ◽  
High Throughput Experiments ◽  
The Relationship

Traditional high-throughput experiments increase the test efficiency by designing component gradient tests and other methods. This article intends to improve the traditional high-throughput experiments and proposes an experimental scheme combining nanoindentation technology and electron probe microanalysis (EPMA). Based on a new Ti-Mo-Al-Zr-Cr-Sn alloy, micro-region composition and corresponding performance at multiple indentations are directly characterized, including a series of different alloy compositions composed of 8 elements such as Mo, Al and the corresponding hardness (H) and elastic modulus (E). Then the principal analysis method in statistics, the theory of molybdenum equivalent and aluminum equivalent are used to process the obtained data, and a series of atlases such as "E-H-component characteristic parameters" and "E-H-alloy equivalents" are constructed, which has achieved high-throughput characterization of the relationship between composition and performance of titanium alloy. Related work can not only quickly determine the alloy composition range corresponding to high E and high H values, but also provide guidance for further optimization of titanium alloy composition design.

Fourier analysis of optical spectra for characterization of regimes in passively mode-locked fiber lasers

2020 ◽  
Author(s):  
Héctor G. Santiago-Hernández ◽  
David I. Serrano-García ◽  
Olivier Pottiez ◽  
Baldemar Ibarra-Escamilla ◽  
Jorge L. Flores Nuñez ◽  
...  
Keyword(s):  
Fourier Analysis ◽  
Fiber Lasers ◽  
Optical Spectra
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