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Shallow foundation is a common foundation type that is usually used for small to medium size structures. The bearing ability and the failure mechanism of shallow foundation are the fundamental concerns for geotechnical engineers, and the demand for new insights into the relevant issue is still increasing. This paper presents an acoustic emission (AE) characterization of the failure process of shallow foundation, with the aim of revealing the fundamental information on AE signals associated with shallow foundation loading as well as its connection with the ground bearing behavior. Experiments were carried out to model the failure process of shallow foundation resting on sandy ground with different densities (i.e. loose and dense) and subjected to different loading conditions (i.e. monotonic and cyclic loading). Comparisons between AE activities and ground bearing behavior are presented. The feasibility of using AE for stability monitoring of shallow foundation is revealed and discussed.
This article was published in the following journal.
Resting oxygen consumption (VO) is often estimated and frequently used to guide therapeutic decisions in symptomatic heart failure (HF) patients. The relationship between resting VO and symptomatic HF...
Pulse diffusive nitrous oxide (NO) emission following water application is well documented, whereas NO emission caused by soil water-air displacement during the watering process (termed as soil degass...
Guidelines recommend the use of fractional flow reserve (FFR) to guide percutaneous coronary intervention. For this purpose, physiological lesion assessment without adenosine may have a similar diagno...
The interaction of a propagating crack in implanted silicon with self-emitted acoustic waves results in periodic patterns on fractured surfaces. Direct measurement of the acoustic emission ahead of th...
In this article, a new avenue of using the piezoelectric wafer active sensor (PWAS) for detecting the fatigue crack generated acoustic emission (AE) signals is presented. In-situ AE-fatigue experiment...
Predicting successful discontinuation from mechanical ventilation has been a focus of interest to all critical care physicians . Various weaning indices have been investigated to optimize ...
To compare the rapid shallow breathing index (RSBI) values, the incidence of adverse reactions, and the predictive accuracy measured under 5 different ventilator strategies in the same pat...
In this study, the investigators sought to determine whether an acoustic cardiographic assessment of heart function is equivalent to Doppler-echocardiography in patients who are treated wi...
The Rapid Shallow Breathing Index (RSBI) is the ratio between respiratory rate (RR) and tidal volume (VT). It is routinely used to predict mechanical ventilation weaning outcome in ICU pat...
The study will evaluate the performance of measuring respiration rate with the Respiratory Acoustic Monitoring (RAM).
The end-stage of CHRONIC RENAL INSUFFICIENCY. It is characterized by the severe irreversible kidney damage (as measured by the level of PROTEINURIA) and the reduction in GLOMERULAR FILTRATION RATE to less than 15 ml per min (Kidney Foundation: Kidney Disease Outcome Quality Initiative, 2002). These patients generally require HEMODIALYSIS or KIDNEY TRANSPLANTATION.
An imaging technique using compounds labelled with short-lived positron-emitting radionuclides (such as carbon-11, nitrogen-13, oxygen-15 and fluorine-18) to measure cell metabolism. It has been useful in study of soft tissues such as CANCER; CARDIOVASCULAR SYSTEM; and brain. SINGLE-PHOTON EMISSION-COMPUTED TOMOGRAPHY is closely related to positron emission tomography, but uses isotopes with longer half-lives and resolution is lower.
A scientific tool based on ULTRASONOGRAPHY and used not only for the observation of microstructure in metalwork but also in living tissue. In biomedical application, the acoustic propagation speed in normal and abnormal tissues can be quantified to distinguish their tissue elasticity and other properties.
Conditions in which the KIDNEYS perform below the normal level for more than three months. Chronic kidney insufficiency is classified by five stages according to the decline in GLOMERULAR FILTRATION RATE and the degree of kidney damage (as measured by the level of PROTEINURIA). The most severe form is the end-stage renal disease (CHRONIC KIDNEY FAILURE). (Kidney Foundation: Kidney Disease Outcome Quality Initiative, 2002)
A measurement of OXYGEN uptake in a sitting, resting person (resting oxygen consumption), varying with age, sex, race, and other factors. In normal adult men, one MET is approximately 3.5 ml O2/kg/min of body weight. Oxygen uptake during activities or work can be measured in METs which can be use to determine health status and exercise prescription.