Transverse Coherence Loss
Transverse Coherence Loss - Related Videos
08:25
Transverse Aortic Constriction in Mice
0 Views •
Cited by 263 •
2010
Transverse aortic constriction (TAC) in the mouse is a commonly used experimental model to study mechanisms underlying cardiac hypertrophy and heart failure development. Here, we describe procedures to constrict the aorta to create a reproducible degree of cardiac hypertrophy in mice.
01:10
Line Loss
0 Views •
2024
The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss. Line loss impacts power delivery efficiency in a balanced three-phase circuit. The symmetry in such a circuit simplifies the...
10:39
Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
0 Views •
Cited by 10 •
2016
The measurement protocol and data analysis procedure are given for obtaining transverse coherence of a synchrotron radiation X-ray source along four directions simultaneously using a single 2-D checkerboard phase grating. This simple technique can be applied for complete transverse coherence characterization of X-ray sources and X-ray optics.
07:40
Minimally Invasive Transverse Aortic Constriction in Mice
0 Views •
Cited by 42 •
2017
Minimally invasive transverse aortic constriction (MTAC) conserves the essentials of regular transverse aortic constriction (TAC) while eliminating the use of a ventilator with tracheal intubation. It proves to be a highly desirable method for high-throughput studies on left ventricular overload, particularly in translational studies.
12:27
Piping Networks and Pressure Losses
0 Views •
2023
Source: Alexander S Rattner, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA This experiment introduces the measurement and modeling of pressure losses in piping networks and internal flow systems. In such systems, frictional flow resistance from channel walls, fittings, and obstructions causes mechanical energy in the form of fluid pressure to be converted to heat. Engineering analyses are needed to size flow hardware to ensure...
FAQs
Spin-spin interactions make neighboring nuclear spins influence one another, so individual spin packets no longer maintain identical phase evolution. As their precession phases separate, their transverse magnetization contributes less coherently to the detected signal. The resulting decay is summarized by T2, allowing relaxation measurements to connect signal loss with interactions occurring within the molecular spin system.
Local magnetic-field variations and molecular motion affect coherence through different aspects of phase evolution. Field differences cause spin packets to precess with unequal phases, while motion can alter the magnetic environment experienced by nuclei over time. Considering both sources helps explain why transverse magnetization decays and prevents researchers from attributing every loss of coherence to one interaction.
T2 provides the characteristic time scale for the decay of transverse magnetization, and this decay determines signal linewidth. Consequently, changes in T2 directly influence how sharply NMR signals appear and how readily nearby spectral features can be distinguished. Monitoring this relationship helps researchers interpret relaxation behavior alongside the spectral resolution obtained from a magnetic resonance experiment.
During a relaxation measurement, researchers follow the reduction of transverse magnetization as synchronized phase relationships decay and determine the characteristic T2 value. Comparing this behavior among chemical systems or experimental conditions can reveal differences associated with molecular dynamics and chemical environments. The same information helps evaluate pulse sequences whose performance depends on maintaining transverse coherence.
The decay reflects contributions from spin-spin interactions, local magnetic-field variations, and molecular motion, all of which can depend on the surrounding chemical environment. Interpreting T2 together with signal linewidth gives researchers a way to compare how those environments influence NMR responses. In chemistry, this supports molecular characterization and the interpretation of differences among observed signals.
The process matters whenever an experiment must preserve or interpret transverse magnetization during a pulse sequence. In multidimensional NMR, coherence loss can influence sequence performance and spectral resolution. In MRI, it affects magnetic-resonance signal behavior. Understanding T2 helps researchers evaluate how decay may shape experimental outcomes and interpret measurements in these related applications.