Articles tagged with Flow Stress
Researchers discovered that trying to make ourselves happier actually makes us less happy by draining our ability to use self-control and willpower. This 'happiness paradox' is caused by mentally exhausting efforts to regulate thoughts, emotions, and behaviors.
A study published in Mayo Clinic Proceedings found that patients who can exercise during cardiac stress testing have a lower mortality rate than those who cannot. The researchers discovered that assessing a patient's ability to exercise during testing provides a stronger distinction between high- and low-risk patients.
KAIST researchers developed a new electrochemical impedance spectroscopy (EIS) technology using small currents to diagnose electric vehicle batteries with high precision. This low-current EIS system minimizes thermal effects and safety issues during measurement, making it suitable for integration into vehicles.
A team of researchers from USC and Caltech developed a new noninvasive tool to measure brain blood pressure, assessing stroke risk through changes in blood flow and volume during a stress test. The affordable, portable device has the potential to transform stroke care by providing more reliable data than existing questionnaires.
A laboratory study found that passive heat exposure stresses the heart, increasing myocardial blood flow in all participants, regardless of age or health status. Adults with a history of CAD are at particular risk and may benefit from minimizing cardiac strain during extreme heat by staying cool.
A study by MIT scientists found that microscopic defects in the ice shape how massive glaciers flow, leading to revised predictions of future sea-level rise. The researchers developed a model to estimate an icy region's sensitivity to stress, directly relating it to its likelihood of flowing.
Researchers at MIT have developed a method to analyze the behavior of granular materials, revealing their internal forces and shapes in 3D detail. This breakthrough may lead to better understanding of landslides and industrial processes.
Scientists investigate fundamental physics of non-Newtonian fluids, discovering that friction between particles plays a critical role in their behavior. This new understanding contributes to smart material design and could lead to applications such as clump-free paint, wearable protective gear, and customized materials with controlled ...
Lehigh University researchers have discovered that applying magnetic forces to individual 'microroller' particles can spur collective motion, allowing the grains to flow uphill, up walls, and climb stairs. This counterintuitive phenomenon has potential applications in mixing, segregating materials, and microrobotics.
Researchers created a 3D model of Helicobacter pylori to better understand its movement and develop new treatments for ulcers and other diseases. The study identified critical thresholds that the bacteria must overcome to move through viscous fluids.
Purdue University researchers have discovered a new mathematical framework that measures stress and stretching field topologies for complex fluids. This breakthrough applies to polymeric fluids used in groundwater remediation and other industries, enabling more accurate predictions of fluid transport.
A team led by Douglas Jerolmack and Paulo Arratia used laboratory experiments to understand how mudslide failure and flow behavior relates to soil material properties. They found a clear signal in 'dirty' samples using high-tech rheometers, shedding light on the tipping point for slope liquefaction.
Aneurysms occur when blood vessel thins and expands, leading to increased stress on walls and rising rupture probability. The new model uses computed tomography scans to reconstruct geometry and blood flow patterns.
The study found that patients with severe stress-induced myocardial ischemia are likely to benefit from heart bypass surgery or angioplasty, while those with mild or no ischemia are not. Early revascularization was associated with a more than 30 percent reduction in mortality compared to patients treated with medication.
Researchers from MIT found that Oreo creme tends to stick consistently to one side of the cookie, regardless of twisting speed or milk exposure. The study used a custom-made 'Oreometer' instrument to investigate cookie mechanics and encourage further research on rheology.
Researchers subject Oreos to various tests, finding that the cream almost always separates onto one wafer, regardless of flavor or amount of filling. The team's study provides insights into the properties of yield stress fluids and offers a new approach to understanding non-Newtonian materials.
A new study by MIT researchers reveals that glacier ice flow is more sensitive to stress than previously calculated, with revised estimates potentially refining predictions of sea level rise. The improved model could help glaciologists better understand the impact of Antarctic ice flow on future sea levels.
A new imaging technique can detect early signs of blood trauma in red blood cells, which could aid in the development of markers to prevent damage. The technique, developed by researchers at Shibaura Institute of Technology and Griffith University, uses high-speed cameras to visualize changes in RBC shape under stress.
Researchers have developed AI-powered computer models to predict heart attacks, strokes, and stress-induced blood pressure changes. The models use machine learning to detect early signs of aortic valve anomalies, enabling at-home monitoring and improved diagnostic accuracy.
Earthquakes generated by controlled fluid injection at the Rangely oil field were caused by destabilizing fault pore pressure changes, according to a new mechanistic model. The study revisits data from the decades-old project in light of increased seismicity due to fluid injection.
Researchers built an artificial antrum to study the complex flow patterns and mechanical stresses in the stomach. The prototype revealed a classifying effect based on droplet breakup and transport phenomena, showing how lower stomach contraction waves classify foods.
Research found that drinking flavanol-rich cocoa can improve blood vessel function during mental stress and reduce temporary impairments in endothelial function. Flavanols, commonly found in fruit and vegetables, have been shown to have a positive effect on cardiovascular health during periods of acute vascular vulnerability.
A Northwestern Medicine pilot study found that high levels of progesterone during the menstrual cycle can reduce stress after a concussion and speed recovery. Increased blood flow to the brain is also linked to lower stress symptom levels, providing new insights into how female athletes may recover from concussions.
Researchers developed a system to identify seismic events related to oil and gas activities, using sound signals and machine learning. They created 3D-printed rocks with controlled mineral layers to study fault failures and fracture types.
Research presented at the American College of Cardiology's Annual Scientific Session found that mental stress may be a stronger predictor of a repeat heart attack or dying from heart disease. Among over 300 young and middle-aged individuals, those who endured myocardial ischemia with mental stress had a two-fold higher likelihood of ha...
A landmark study suggests that e-cigarette use is associated with coronary vascular dysfunction at rest, even in the absence of physiologic stress. The researchers found that blood flow decreased after both inhalation and handgrip stress in e-cigarette users compared to traditional cigarette smokers.
A new technique using viscoplastic lubrication stabilizes multilayer flows, allowing for efficient transportation of heavy oils. By positioning a layer of yield stress between the oil and lubricant, researchers eliminate interfacial instabilities and improve flow stability.
A study from Duke Health researchers reveals that MRI cardiac stress testing can predict mortality and diagnose coronary artery disease more effectively than existing methods. The non-invasive technology has potential as an alternative to stress echocardiograms, catheterizations, and nuclear exams.
Researchers at Duke University Medical Center have developed a blood test that can detect early changes in blood flow to the heart by identifying five specific metabolites. The test shows promise as an alternative or complement to current stress tests, which could lead to more accurate diagnoses and efficient treatment plans.
A study found that chronic stress alters blood flow regulation in specific brain regions, including the temporal and prefrontal cortex. The researchers suggest understanding these changes may aid in assessing individuals' risk for stress-related illnesses.
Consultants argue that the four-hour wait target remains essential for driving flow through the urgent care system, reducing mortality rates. Experts caution that abandoning the target could worsen hospital overcrowding and performance issues due to perverse incentives.
Researchers at TU Darmstadt develop a new technique to fabricate microlens arrays with highly regular structures, reducing costs and time. The method uses cellular convection in a thick liquid layer to pattern a thin polymer film, ideal for photovoltaic systems.
A research team found that a geologic event known as diking can cause strong earthquakes, with the potential to pose hazards to nearby communities. The team investigated ties between two natural disasters in the Democratic Republic of Congo and discovered that a dike intrusion could have induced a magnitude 6.2 earthquake.
A meta-analysis of six studies found that people with high stress jobs had a 22% higher risk of stroke than those with low stress jobs. Women with high stress jobs were 33% more likely to experience an ischemic stroke.
A new study suggests that Antarctic glaciers are more sensitive to climate change than previously thought due to Coulomb friction. The West Antarctic Ice Sheet's melting rate is significantly increased when accounting for frictional stresses, which can lead to accelerated sea-level rise.
A new study has found that BPS, a common chemical substitute for BPA, can cause disruptions to female heart rhythms. The research suggests that BPS, like its BPA counterpart, interferes with hormone regulation and causes abnormal calcium handling in cardiac muscle cells.
A new study found that earthquake lights are more likely to occur on or near rift environments and adjacent to subvertical faults. The study analyzed 65 documented cases of earthquake lights, finding that 85% appeared spatially on or near rifts and 97% appeared adjacent to subvertical faults.
Researchers found that metabolic PET imaging detected coronary disease at an early stage, with a sensitivity of 96%, compared to 56% for MPI. This technique could potentially be used for initial CAD screening to help doctors better determine a patient's cardiac risk and manage care.
Researchers at Rice University and Baylor College of Medicine have discovered that stressed proteins can remain in a dangerous shape for up to five hours before returning to their normal state. This finding has profound clinical implications, as it helps explain the workings of the key clot-forming protein von Willebrand factor.
Researchers found that film casting methods can affect the ordering of block copolymers in thin films. Spin casting led to fewer residual stresses and improved cylinder alignment for computer memory devices, suggesting a potential route for enhanced device performance.
A new study from Duke University Medical Center found that financial reimbursement for cardiac imaging tests increases their use, with doctors ordering tests 50-100% more often when billed for both performing and interpreting the results.
Researchers developed new Coulomb failure criteria for reservoirs and fault slips, taking into account viscous stress and Reynolds stress. The study used flow-driven pore-network crack model and hybrid hypersingular integral equation-lattice Boltzmann method to analyze the Zipingpu reservoir and Longmenshan slip.
A new study reveals that women are more likely to be referred for unnecessary nuclear stress tests than men, with a majority of inappropriate studies ordered by primary care physicians. The research suggests that education among primary care providers is needed to improve test ordering for women.
Fast molecular rearrangements in plastics allow them to absorb energy and change shape without breaking, enabling properties like plastic flow. This quality enables plastics to bend rather than break under stress, as observed in bulletproof glass that flows around bullets.
Researchers identify gene variation associated with mental stress-induced ischemia, a condition that increases the risk of heart attack and sudden death. About two-thirds of patients with coronary artery disease experience detectable mental stress-induced reductions in blood flow to the heart.
Researchers found that brief periods of blocked blood flow activate a protective molecular pathway in the heart, protecting it from damage caused by restored blood flow. The study suggests that these 'mini stress tests' may help precondition and protect the heart from future attacks.
Researchers identified an accurate method to detect coronary artery disease risk in obese individuals using stress myocardial perfusion imaging. The test can help physicians plan management strategies for patients with 'silent' disease, reducing the risk of angina, heart attack, and death.
A Virginia Tech researcher has developed a technique to disperse nano particles into polymers, improving their mechanical properties. The method uses supercritical fluid carbon dioxide to exfoliate nano particles at higher concentrations, leading to enhanced mechanical properties.
Researchers found that many patients with normal stress test results have extensive atherosclerosis, as revealed by coronary calcium scanning. Patients with scores above 100 are at increased risk for cardiac events, while those above 400 are at the highest risk.