scholarly journals Temporal and Spatial Properties of Arterial Pulsation Measurement Using Pressure Sensor Array

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Chung-Shing Hu ◽  
Yu-Feng Chung ◽  
Cheng-Chang Yeh ◽  
Ching-Hsing Luo
Keyword(s):  
Clinical Experience ◽  
Three Dimensional ◽  
Pulse Diagnosis ◽  
Array Sensor ◽  
Spatial Properties ◽  
Paired Samples ◽  
Arterial Pulsation ◽  
Length Width ◽  
Single Sensor ◽  
Temporal And Spatial

Conventionally, a pulse taking platform is based on a single sensor, which initiates a feasible method of quantitative pulse diagnosis. The aim of this paper is to implement a pulse taking platform with a tactile array sensor. Three-dimensional wrist pulse signals are constructed, and the length, width, ascending slope, and descending slope are defined following the surface of the wrist pulse. And the pressure waveform of the wrist pulse obtained through proposed pulse-taking platform has the same performance as the single sensor. Finally, the results of a paired samplest-test reveal that the repeatability of the proposal platform is consistent with clinical experience. On the other hand, the results of ANOVA indicate that differences exist among different pulse taking depths, and this result is consistent with clinical experience in traditional Chinese medicine pulse diagnosis (TCMPD). Hence, the proposed pulse taking platform with an array sensor is feasible for quantification in TCMPD.

The Study of Transonic Flows by Quantitative Holographic Interferometry

1994 ◽  
Vol 208 (2) ◽  
pp. 91-97 ◽  
Author(s):  
S C J Parker ◽  
C M E Holden ◽  
P J Bryanston-Cross
Keyword(s):  
Holographic Interferometry ◽  
Three Dimensional ◽  
Wind Tunnel Testing ◽  
Fringe Analysis ◽  
Transonic Flows ◽  
Spatial Properties ◽  
Computational Fluid Dynamics Cfd ◽  
Temporal And Spatial ◽  
Working Section ◽  
Frequent Problem

Optical flow diagnostics are non-intrusive and therefore suitable for investigating perturbation sensitive transonic flows. Unfortunately, most of these techniques depend on particle seeding and are confined to point measurements. In contrast, holographic interferometry is whole field, does not require seeding, and is an appropriate tool for the study of temporal and spatial properties of unsteady flows. At present, however, holographic interferometry is mainly used qualitatively due to the practical restrictions of data recording, acquisition and processing. This paper addresses some of the limitations that have prevented routine use of holographic interferometry in production wind tunnel testing. Vibration is a frequent problem when capturing interferometric data; however, this paper shows that the associated rigid body movements are easily removed during Fourier transform fringe analysis. A second major limitation arises when attempting to interpret and analyse interferograms from three-dimensional flows. To overcome this problem, a prototype optical system is described which can record multiple interferometric views around the working section. The information extracted from these images may then be used to tomographically reconstruct the three-dimensional density field. Holographic measurements for two-dimensional and three-dimensional axisymmetric flows are presented and compared quantitatively to computational fluid dynamics (CFD) predictions. The experimental and computational results are in general agreement and demonstrate the feasibility of automating the extraction of three-dimensional density data from holographic interferograms.

Early Clinical Experience With Color Three-Dimensional Intravascular Ultrasound in Peripheral Interventions

2001 ◽  
Vol 8 (4) ◽  
pp. 329-338 ◽  
Author(s):  
Khalid Irshad ◽  
Donald B. Reid ◽  
Peter H. Miller ◽  
Raj Velu ◽  
George E. Kopchok ◽  
...  
Keyword(s):  
Intravascular Ultrasound ◽  
Clinical Experience ◽  
Three Dimensional ◽  
Early Clinical Experience

scholarly journals Inter-rater variability of three-dimensional fracture reduction planning according to the educational background

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Christoph Zindel ◽  
Philipp Fürnstahl ◽  
Armando Hoch ◽  
Tobias Götschi ◽  
Andreas Schweizer ◽  
...  
Keyword(s):  
Distal Radius ◽  
Clinical Experience ◽  
Three Dimensional ◽  
Computer Assisted Surgery ◽  
Educational Background ◽  
Fracture Reduction ◽  
Computer Assisted ◽  
Operation Planning ◽  
Level Of Evidence ◽  
Fragment Displacement

Abstract Background Computer-assisted three-dimensional (3D) planning is increasingly delegated to biomedical engineers. So far, the described fracture reduction approaches rely strongly on the performance of the users. The goal of our study was to analyze the influence of the two different professional backgrounds (technical and medical) and skill levels regarding the reliability of the proposed planning method. Finally, a new fragment displacement measurement method was introduced due to the lack of consistent methods in the literature. Methods 3D bone models of 20 distal radius fractures were presented to nine raters with different educational backgrounds (medical and technical) and various levels of experience in 3D operation planning (0 to 10 years) and clinical experience (1.5 to 24 years). Each rater was asked to perform the fracture reduction on 3D planning software. Results No difference was demonstrated in reduction accuracy regarding rotational (p = 1.000) and translational (p = 0.263) misalignment of the fragments between biomedical engineers and senior orthopedic residents. However, a significantly more accurate planning was performed in these two groups compared with junior orthopedic residents with less clinical experience and no 3D planning experience (p < 0.05). Conclusion Experience in 3D operation planning and clinical experience are relevant factors to plan an intra-articular fragment reduction of the distal radius. However, no difference was observed regarding the educational background (medical vs. technical) between biomedical engineers and senior orthopedic residents. Therefore, our results support the further development of computer-assisted surgery planning by biomedical engineers. Additionally, the introduced fragment displacement measure proves to be a feasible and reliable method. Level of Evidence Diagnostic Level II

STUDY ON THE OPTIMIZATION FOR THE SIZE OF FUEL CELL FLOW FIELD UNDER INADEQUATE AIR SUPPLY CONDITION

Química Nova ◽  
2021 ◽  
Author(s):  
Shi Lei ◽  
Zheng Minggang
Keyword(s):  
Fuel Cell ◽  
Flow Field ◽  
Proton Exchange Membrane ◽  
Three Dimensional ◽  
Proton Exchange ◽  
Field Size ◽  
Air Supply ◽  
Supply Condition ◽  
Length Width ◽  
Exchange Membrane

In this paper, the influence of the optimization for flow field size on the proton exchange membrane fuel cell (PEMFC) performance under the inadequate air supply of cathode was studied based on the three-dimensional, steady-state, and constant temperature PEMFC monomer model. Additionally, the effect of the optimization for hybrid factors, including length, width, depth and width-depth, on the PEMFC performance was also investigated. The results showed that the optimization of the flow field size can improve the performance of the PEMFC and ensure that it is close to the level under the normal gas supply.

Temporal and spatial properties of some deep moonquake clusters

2007 ◽  
Vol 112 (E9) ◽  
Author(s):  
R. C. Bulow ◽  
C. L. Johnson ◽  
B. G. Bills ◽  
P. M. Shearer
Keyword(s):  
Spatial Properties ◽  
Temporal And Spatial

scholarly journals How to measure a Hill–Sachs lesion: a systematic review

2019 ◽  
Vol 4 (4) ◽  
pp. 151-157 ◽  
Author(s):  
Marta Maio ◽  
Marco Sarmento ◽  
Nuno Moura ◽  
António Cartucho
Keyword(s):  
Bone Loss ◽  
Three Dimensional ◽  
Correlation Coefficients ◽  
Glenohumeral Instability ◽  
Search Terms ◽  
Simultaneous Evaluation ◽  
Length Width ◽  
Anterior Glenohumeral Instability ◽  
The Hill ◽  
Mri Measurements

Quantifying bone loss is important to decide the best treatment for patients with recurrent anterior glenohumeral instability. Currently, there is no standard method available to make a precise evaluation of the Hill–Sachs lesion and predict its engagement before the surgical procedure. This literature review was performed in order to identify existing published imaging methods quantifying humeral head bone loss in Hill–Sachs lesions. Searches were undertaken in Scopus and PubMed databases from January 2008 until February 2018. The search terms were “Hill-Sachs” and “measurement” for the initial search and “Hill–Sachs bone loss” for the second, to be present in the keywords, abstracts and title. All articles that presented a method for quantifying measurement of Hill–Sachs lesions were analysed. Several methods are currently available to evaluate Hill–Sachs lesions. The length, width and depth measurements on CT scans show strong inter and intra-observer correlation coefficients. Three-dimensional CT is helpful for evaluation of bony injuries; however, there were no significant differences between 3D CT and 3D MRI measurements. The on-track off-track method using MRI allows a simultaneous evaluation of the Hill–Sachs and glenoid bone loss and also predicts the engaging lesions with good accuracy. Cite this article: EFORT Open Rev 2019;4:151-157. DOI: 10.1302/2058-5241.4.180031

scholarly journals An Investigation into the Optimal Experience in Reading Journalistic Texts in Light of Instructing Fairclough’s and Van Dijk’s Model

2017 ◽  
Vol 6 (3) ◽  
pp. 232 ◽  
Author(s):  
Seyyed Alireza Hamedi ◽  
Seyyedeh Mina Hamedi ◽  
Seyyedeh Maryam Hamedi ◽  
Seyyedeh Massoumeh Hamedi
Keyword(s):  
Critical Discourse Analysis ◽  
Community Sample ◽  
Three Dimensional ◽  
Treatment Phase ◽  
Critical Discourse ◽  
Optimal Experience ◽  
Flow Experience ◽  
Three Dimensional Model ◽  
Paired Samples ◽  
Proficiency Level

The present study aims at exploring the extent to which Critical Discourse Analysis (CDA) familiarity may have an impact on flow experience. In so doing, the community sample of 60 students comprising 16 males and 44 females participated in the study. Initially, the pretest was conducted to ensure the homogeneity of their proficiency level. Besides, the participants were asked to reflect on their flow experience while reading three distinct genres of journalistic texts prior to the application of the treatment. During the treatment phase, they were instructed how to critically examine other journalistic texts relying on Fairclough’s (1989) three dimensional model along with Van Dijk’s (1995) theoretical framework of CDA over 10 successive sessions. Finally, utilizing paired- samples  t-tests, the results of the posttests on the very three texts which were conducted at the pretest stage, indicated that the application of CDA  has a significant influence on the students’ optimal experience while reading descriptive, expository, and narrative genres of journalistic texts.

scholarly journals Reconstructing intragranular strain fields in polycrystalline materials from scanning 3DXRD data

2020 ◽  
Vol 53 (2) ◽  
pp. 314-325 ◽  
Author(s):  
N. Axel Henningsson ◽  
Stephen A. Hall ◽  
Jonathan P. Wright ◽  
Johan Hektor
Keyword(s):  
Three Dimensional ◽  
Polycrystalline Materials ◽  
Reconstruction Method ◽  
X Ray Diffraction ◽  
Reconstruction Accuracy ◽  
Strain Fields ◽  
Spatial Properties ◽  
Reconstruction Methods ◽  
Reconstruction Quality ◽  
Made In

Two methods for reconstructing intragranular strain fields are developed for scanning three-dimensional X-ray diffraction (3DXRD). The methods are compared with a third approach where voxels are reconstructed independently of their neighbours [Hayashi, Setoyama & Seno (2017). Mater. Sci. Forum, 905, 157–164]. The 3D strain field of a tin grain, located within a sample of approximately 70 grains, is analysed and compared across reconstruction methods. Implicit assumptions of sub-problem independence, made in the independent voxel reconstruction method, are demonstrated to introduce bias and reduce reconstruction accuracy. It is verified that the two proposed methods remedy these problems by taking the spatial properties of the inverse problem into account. Improvements in reconstruction quality achieved by the two proposed methods are further supported by reconstructions using synthetic diffraction data.

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