Time-domain fluorescence molecular tomography based on experimental data

2009 ◽  
Author(s):  
Limin Zhang ◽  
Jiao Li ◽  
Feng Gao ◽  
Huiyuan He ◽  
Huijuan Zhao
Keyword(s):  
Experimental Data ◽  
Time Domain ◽  
Fluorescence Molecular Tomography

Analysis of Operating Deflection Shapes Based on Subspace Method

1997 ◽  
Author(s):  
Nobutaka Tsujiuchi ◽  
Yuichi Matsumura ◽  
Takayuki Koizumi
Keyword(s):  
Experimental Data ◽  
Time Domain ◽  
State Space Model ◽  
Measurement Data ◽  
Time Varying ◽  
Subspace Method ◽  
Identification Scheme ◽  
Space Model ◽  
Time Varying Systems ◽  
Frequency Components

Abstract In this paper, we propose the new method to identify the Operating Deflection Shapes (ODSs) from the measurement data of time domain. At first, we present the identification scheme of ODSs based on a state-space model. Then the scheme is extended to identify the ODSs adaptively for the time-varying systems by using the URV Decomposition (URVD). Proposed scheme is able to decompose the deformation of a structure under operating condition into the underlying superposition of well excited frequency components. This paper introduces the algorithm and shows the effectiveness of our proposed scheme applyed for both synthesized and experimental data.

Time-Domain Flooding Simulation of a Damaged Warship

2020 ◽  
Vol 54 (2) ◽  
pp. 69-78
Author(s):  
Li-fen Hu ◽  
Hao Wu ◽  
Qingtao Gong ◽  
Xiangyang Wang ◽  
Wenbin Lv
Keyword(s):  
Experimental Data ◽  
Time Domain ◽  
Stability Criterion ◽  
Vof Method ◽  
Navier Stokes ◽  
Ship Motions ◽  
Fluid Interface ◽  
Complex Dynamic ◽  
Turbulence Effect ◽  
Mesh Update

AbstractUnderstanding of the complex dynamic behavior of damaged ships and floodwater remains limited for ship designers and safety authorities. In this work, a Navier-Stokes (NS) solver that combines the volume of fluid (VOF) method with overset mesh techniques is developed to simulate the flooding process of a damaged ship. The VOF method captures the fluid interface, and the turbulence effect on flows is considered with the k-ω model. The overset mesh techniques are employed to handle the mesh update following transient ship motions. Then, the results of a damaged barge with dynamic and overset mesh are compared with the experimental data. On the basis of this validation, the solver is applied to the flooding problems of a damaged warship. This research is intended to be a useful step toward the establishment of a stability criterion for damaged ships in the future.

scholarly journals Jonscher indices for dielectric materials

2019 ◽  
Vol 09 (06) ◽  
pp. 1950046
Author(s):  
C. L. Wang
Keyword(s):  
Experimental Data ◽  
Asymptotic Behavior ◽  
Dielectric Relaxation ◽  
Time Domain ◽  
Dielectric Response ◽  
Relaxation Function ◽  
Dielectric Materials ◽  
Dielectric Response Function ◽  
Barium Stannate ◽  
Two Parameters

Two parameters are proposed as Jonscher indices, named after A. K. Jonscher for his pioneering contribution to the universal dielectric relaxation law. Time domain universal dielectric relaxation law is then obtained from the asymptotic behavior of dielectric response function and relaxation function by replacing parameters in Mittag–Leffler functions with Jonscher indices. Relaxation types can be easily determined from experimental data of discharge current in barium stannate titanate after their Jonscher indices are determined.

scholarly journals Photocatalytic degradation as Davidson–Cole relaxation in time domain

2019 ◽  
Vol 09 (01) ◽  
pp. 1950006 ◽  
Author(s):  
C. L. WANG
Keyword(s):  
Experimental Data ◽  
Differential Equations ◽  
Photocatalytic Degradation ◽  
Gamma Function ◽  
Time Domain ◽  
Degradation Kinetics ◽  
Incomplete Gamma Function ◽  
Response Functions ◽  
Degradation Processes

Photocatalytic degradation processes of different materials are fitted with Mittag-Leffler function and incomplete gamma function, which are response functions for Cole–Cole relaxation and Davidson–Cole relaxation. The fitting results show that both functions can fit experimental data fairly well. The order of derivative in the kinetic differential equations can be either less, or greater than one. In the case of the order of derivative is greater than one, only incomplete gamma function is reasonable for describing the photocatalytic degradation. This work further confirms the existence of the universality in photocatalytic degradation kinetics.

A Study of Indicator Passage Error Correction Schemes

1991 ◽  
Vol 113 (3) ◽  
pp. 399-405
Author(s):  
B. G. Shiva Prasad ◽  
F. L. Heidrich
Keyword(s):  
Experimental Data ◽  
Error Correction ◽  
Time Domain ◽  
Prediction Accuracy ◽  
Method Of Characteristics ◽  
Measuring Transducer ◽  
Dynamic Effects ◽  
Pressure Time ◽  
Efficient Calculation ◽  
Frequency Domain Methods

The passage length between the cylinder and the measuring transducer is known to cause distortion of pressure time traces due to pulsations caused by dynamic effects. This paper attempts to arrive at a simple and efficient calculation scheme for correcting those distortions. Both time domain (method of characteristics approach) and frequency domain methods are evaluated to assess the importance of considering various effects for improving the prediction accuracy. The predictions from both methods are compared with experimental data as well as the results of Heidrich [6], who used simpler versions of these methods.

scholarly journals Integrating Biosignals Measurement in Virtual Reality Environments for Anxiety Detection

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7088
Author(s):  
Livia Petrescu ◽  
Cătălin Petrescu ◽  
Oana Mitruț ◽  
Gabriela Moise ◽  
Alin Moldoveanu ◽  
...  
Keyword(s):  
Experimental Data ◽  
Virtual Reality ◽  
Time Domain ◽  
Classification Accuracy ◽  
Electrodermal Activity ◽  
Nonlinear Function ◽  
Virtual Reality Environment ◽  
Anxiety Levels ◽  
The Time Domain ◽  
Time Evaluation

This paper proposes a protocol for the acquisition and processing of biophysical signals in virtual reality applications, particularly in phobia therapy experiments. This protocol aims to ensure that the measurement and processing phases are performed effectively, to obtain clean data that can be used to estimate the users’ anxiety levels. The protocol has been designed after analyzing the experimental data of seven subjects who have been exposed to heights in a virtual reality environment. The subjects’ level of anxiety has been estimated based on the real-time evaluation of a nonlinear function that has as parameters various features extracted from the biophysical signals. The highest classification accuracy was obtained using a combination of seven heart rate and electrodermal activity features in the time domain and frequency domain.

Time-Domain VIV Prediction of Marine Risers

2012 ◽  
Author(s):  
Peter Ma ◽  
Wei Qiu ◽  
Don Spencer
Keyword(s):  
Experimental Data ◽  
Time Domain ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Time Domain Analysis ◽  
Analysis Tool ◽  
Time Step ◽  
Marine Risers ◽  
Hydrodynamic Damping ◽  
High Reynolds

Vortex Induced Vibration (VIV) of marine risers poses a significant challenge as the offshore oil and gas industry moves into deep water. A time-domain analysis tool has been developed to predict the VIV of marine risers based on a forcing algorithm and by making full use of the available high Reynolds number experimental data. In the formulation, the hydrodynamic damping is not treated as a special case but simply an extension of the experimentally derived lift curves. The forcing algorithm was integrated into a mooring analysis program based on the global-coordinate based finite element method. At each time step, the added mass, lifting force and drag force coefficients and their corresponding loads are computed for each element. Validation studies have been carried out for a full-scale rigid riser segment and a model-scale flexible riser. The numerical results were compared with experimental data and solutions by other programs.

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