Mass Ejection Rate
Mass Ejection Rate - Related Videos
13:35
Mass Conservation and Flow Rate Measurements
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2023
Source: Ricardo Mejia-Alvarez and Hussam Hikmat Jabbar, Department of Mechanical Engineering, Michigan State University, East Lansing, MI The purpose of this experiment is to demonstrate the calibration of a flow passage as a flowmeter using a control volume (CV) formulation [1, 2]. The CV analysis focuses on the macroscopic effect of flow on engineering systems, rather than the detailed description that could be achieved with a detailed differential analysis. These two techniques should be...
08:52
Measurement of Protein Turnover Rates in Senescent and Non-Dividing Cultured Cells with Metabolic Labeling and Mass Spectrometry
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Cited by 2 •
2022
This protocol describes the workflow for metabolic labeling of senescent and non-dividing cells with pulsed SILAC, untargeted mass spectrometry analysis, and a streamlined calculation of protein half-lives.
03:42
A Murine Model of Hyperlipidemia-Induced Heart Failure with Preserved Ejection Fraction
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Cited by 2 •
2024
This protocol presents a detailed approach to replicating a murine model of hyperlipidemia-induced heart failure with preserved ejection fraction (HFpEF). The design combines the administration of adeno-associated virus 9-cardiac troponin T-low-density lipoprotein receptor (AAV9-cTnT-LDLR) and poloxamer-407 (P-407).
07:09
A Surgical Model of Heart Failure with Preserved Ejection Fraction in Tibetan Minipigs
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Cited by 5 •
2022
The present protocol describes a step-by-step procedure to establish a minipig model of heart failure with preserved ejection fraction using descending aortic constriction. The methods for evaluating cardiac morphology, histology, and function of this disease model are also presented.
03:09
Measuring Reaction Rates
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2020
Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical field in...
FAQs
The rate changes in direct proportion to each factor in Ṁ = ρvA when the other two remain fixed. A denser stream carries more mass through the same area at the same speed, while faster motion or a wider outlet increases the amount crossing per unit time. This relation helps identify which flow property controls a change.
Conservation of mass connects the outflow to the source that supplies it. If material leaves continuously, the source’s mass changes according to the amount expelled over time; a changing ejection rate therefore indicates changing mass loss rather than merely a different instantaneous flow condition. This connection is important when interpreting source evolution in physical systems.
Mass ejection rate is not itself a momentum-transfer or energy-transport rate. It specifies how much matter leaves, whereas the resulting momentum and energy effects also depend on properties of the outflow, especially its motion. Keeping these quantities distinct lets physicists use measured mass loss to analyze mechanical and energetic consequences without treating them as interchangeable.
A basic determination starts by characterizing the flowing material and the outlet or flow cross section. Researchers obtain the density ρ, outflow velocity v, and area A, then combine them as Ṁ = ρvA. Repeating this evaluation as conditions change can reveal whether variations arise from the material, its speed, or the available passage area.
In rocket exhaust and industrial jets, the rate quantifies how rapidly material leaves the source and provides a basis for analyzing the flow’s physical effects. Combined with information about outflow motion, it helps assess momentum transfer and energy transport. Comparing rates under different operating conditions can therefore clarify how changes in the expelled stream affect system behavior.
For stellar winds, accretion-disk outflows, and astrophysical explosions, changes in the rate track how rapidly the source loses matter. That information helps physicists examine source evolution and the consequences of expelled material for its surroundings. The same framework connects very different systems, from sustained winds to event-driven outflows, through their changing mass loss.