Magnetization intensity intrinsic

We can perform spatially resolved Carr-Purcell-Meiboom-Gill (CPMG) experiments, and then, for each voxel, use magnetization intensities at the echo times to estimate the corresponding number density function, P(t), which represents the amount of fluid associated with the characteristic relaxation time t. The corresponding intrinsic magnetization for the voxel, M0, is calculated by... 

Static imaging experiments conducted on fluid-saturated samples are used to determine porosity distributions. Carr-Purcell-Meiboom-Gill (CPMG) imaging is used to evaluate the spin density. The local relaxation is modeled in order to estimate the intrinsic magnetization intensity, which is proportional to the amount of saturating fluid. 

The amount of fluid corresponding to each imaged voxel is proportional to the intrinsic magnetization intensity determined for that voxel. The relationship between the mass of fluid, M, and the magnitude of the intrinsic magnetization, M0, is given as... 

Once the specific magnetization intensity is determined, Eq. (24) is used to relate the intrinsic magnetization to the mass of fluid within the porous media sample. Since we assume that the sample is fully saturated, this quantity is considered to be the pore space within the sample and is used in Eq. (3) to determine the porosity, 0 , corresponding to voxel j ... 

The quantitative method in Section 2.2 is used to determine the intrinsic magnetization intensity for each voxel. Cubic B-spline basis functions with a partition of 60 interior knots logarithmically spaced between 1 x 10 5 and 10 s are used to represent the relaxation distribution within each voxel. The optimal regularization parameter, A, of each voxel is found within the range between 1 x 10 5 and 5 x 10"18 s by using the UBPR9 criterion. 

Eu Eu -" is a typical and efficient activator for red-emitting phosphor due to its transitions from the excited Dq level to the Fj (J = 0-4) levels of the 4/ configuration. Its photoluminescence emission strongly depends on the symmetry of the crystal stmcture of Eu " occupied site in the host. The optical transitions of Eu " ions originating from the electronic dipole and magnetic dipole interaction of the internal 4/electrons are deeply affected by the crystal environment. If the Eu " ions occupy the sites with inversion symmetry, the emission will peak at 590-600 nm from the Dq Fi magnetic-dipole transition. This will dominate the emission, which is not affected much by the site symmetry. In contrast, the emission peaks at approximately 610-630 nm, due to the Dq p2 electronic dipole transition, will dominate the emission if the Eu " ion substitutes the site with no inversion symmetry [56], Moreover, Eu -doped phosphors usually have intense intrinsic... 

The interesting thing is that the maximum intensity of the FID at the top of the echo is still less that that at the start of the FID not all of the coherence is recovered by refocusing in the second half of the spin echo. The part that is lost is the intrinsic decay, the loss of coherence due to pure T2 relaxation, a fundamental relaxation process. The spin echo simply gets back the losses due to inhomogeneity of the magnetic field (T losses). This gives us a method to measure 7 We could repeat the spin-echo experiment a number of times with different echo delays (t values) and start the acquisition of the FID at the top of the echo ... 

The challenge of NMR in the pharmaceutical industry is to provide the intrinsically high information content of NMR spectra on smaller sample amounts, more rapidly, and with less time-intensive interpretation. Currently, each of these areas are the focus of intensive research efforts. Sensitivity gains can be expected with further innovations in probe design and with higher magnetic fields. Advances in experimental design will continue to provide more detailed information for... 

---