A new method of PIV-based pressure measurement in supersonic flows

2017 ◽  
Author(s):  
Shun Liu ◽  
Jinglei Xu ◽  
Kaikai Yu
Keyword(s):  
Pressure Measurement ◽  
Supersonic Flows ◽  
New Method

An In Vitro Osteotomy Method to Expose the Medial Compartment of the Human Knee

1997 ◽  
Vol 119 (4) ◽  
pp. 379-385 ◽  
Author(s):  
T. A. Martens ◽  
M. L. Hull ◽  
S. M. Howell
Keyword(s):  
Contact Pressure ◽  
Pressure Measurement ◽  
Femoral Condyle ◽  
Compressive Load ◽  
Medial Femoral Condyle ◽  
Medial Compartment ◽  
New Method ◽  
Load Bearing ◽  
Coronary Ligament

This study was conducted to validate a new in vitro method to expose the medial compartment of the knee to be used in subsequent studies aimed at examining the load bearing capabilities of medial meniscal allografts. The new method involves an osteotomy and reattachment of the medial femoral condyle. The primary hypothesis was that the new method does not alter tibio-femoral contact pressure and area. To validate this method, the baseline contact pressure of the intact medial compartment was measured using a new nondestructive procedure for inserting pressure measurement film into the intact medial hemijoint. A secondary and related hypothesis was that incising the coronary ligament, a destructive method used by previous investigators to position pressure measurement film, alters the normal tibio-femoral contact pressure. To test these hypotheses, Fuji Prescale pressure-sensitive film was used to measure both tibio-femoral contact pressure and area within the medial compartment of the (1) intact knee, (2) the knee after osteotomizing and reattaching the medial femoral condyle, and (3) the osteotomized knee with an incised coronary ligament, using seven cadaver specimens. Measurements were taken at a compressive load of approximately two times body weight with the knee in 0, 15, 30, 45 deg of flexion. No significant differences between the intact and osteotomized knee were detected. Likewise, no significant differences were observed between the osteotomized knee and the osteotomized knee with an incised coronary ligament. These results confirm the utility of the new method in exposing the medial compartment for manipulation and placement of medial meniscal allografts in future studies examining the load-bearing characteristics of meniscal allografts.

555 A New Method of Dynamic Pressure Measurement in High Temperature Filed

2008 ◽  
Vol 2008 (0) ◽  
pp. _555-1_-_555-5_
Author(s):  
Tsunemichi Kawa ◽  
Tetsuji Koyama ◽  
Shigeru Yanagihara ◽  
Kazuo Tsuchiya
Keyword(s):  
High Temperature ◽  
Pressure Measurement ◽  
Dynamic Pressure ◽  
New Method ◽  
Temperature Filed ◽  
Dynamic Pressure Measurement

scholarly journals A study on new method of noninvasive esophageal venous pressure measurement based on the airflow and laser detection technology

2015 ◽  
Vol 26 (s1) ◽  
pp. S413-S422 ◽  
Author(s):  
Chenghuan Hu ◽  
Feizhou Huang ◽  
Rui Zhang ◽  
Shaihong Zhu ◽  
Wanpin Nie ◽  
...  
Keyword(s):  
Pressure Measurement ◽  
Venous Pressure ◽  
New Method ◽  
Laser Detection ◽  
Detection Technology

A new method of non-invasive blood pressure measurement

2005 ◽  
Author(s):  
Liangling Gu ◽  
Yongming Yang ◽  
Chengbo Yu ◽  
Qiaohui Guo ◽  
Gang Zhu
Keyword(s):  
Blood Pressure ◽  
Pressure Measurement ◽  
Blood Pressure Measurement ◽  
New Method ◽  
Invasive Blood Pressure ◽  
Non Invasive ◽  
Invasive Blood Pressure Measurement

scholarly journals Comparison of cuffless blood pressure measurement using an electrocardiogram monitor with photoplethysmography function with measurement by the Korotkov method: a pilot study

2021 ◽  
Vol 12 (1) ◽  
pp. 39-49
Author(s):  
N. A. Gogiberidze ◽  
Z. N. Sagirova ◽  
N. O. Kuznetsova ◽  
D. G. Gognieva ◽  
P. Sh. Chomakhidze ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Arterial Hypertension ◽  
Pressure Measurement ◽  
Blood Pressure Measurement ◽  
Blood Pressure Level ◽  
New Method ◽  
Cross Sectional ◽  
Measurement Results ◽  
The Difference ◽  
Cuffless Blood Pressure

The aim. To evaluate the reliability of blood pressure (BP) measurement results using a cuffless blood pressure device (CardioQVARK®) in comparison with the values obtained using the Korotkov method.Materials and methods. An observational cross-sectional study of 50 patients (25 men, mean age 60 ± 14 years) with arterial hypertension was performed. Blood pressure was measured by the Korotkov method as a standard method, and a CardioQVARK® device, made in the form of a smartphone case, was used as a new method. The device records the electrocardiogram and the photoplethysmogram. Based on the parameters of the electrocardiogram and the photoplethysmogram the systolic and diastolic blood pressure (SBP and DBP) is calculated. Correlation analysis, Student’s t-test, Bland-Altman method were used for comparing the two methods, the standard deviation of the difference and a 95% confidence interval (95% CI) were calculated.Results. There were no statistically significant differences in the mean values of SBP and DBP for the two methods. There was a strong direct relationship between SBP (r = 0.976, p < 0.0001) and DBP (r = 0.817, p < 0.0001), measured by two methods. Bias for SBP and DBP measured by the new method was: –0.5 mm Hg (95% CI: –1.7; 0.7) and –0.3 mmHg (95% CI: –1.4; 0.7), respectively. The difference in DBP measurements depended on the blood pressure level (r = 0.302, p = 0.03). The underestimation of DBP values was more pronounced for low blood pressure from 55 to 75 mm Hg. At the time of the study, 13 (26%) patients had an increase in blood pressure. The sensitivity of the new method in detecting arterial hypertension was 77% (95% CI: 46; 95), specificity 100% (95% CI: 91; 100), accuracy 94% (95% CI: 83; 99).Conclusion. The blood pressure measurement method based on the analysis of the electrocardiogram and photoplethysmogram showed reliable blood pressure measurement results in comparison with the Korotkov method.

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