PURPOSE Establishment of regional longitudinal (T1 ) and transverse (T2 ) relaxation times in awake pigeons and rats at 7T field strength. Regional differences in relaxation times between species and between two different pigeon breeds (homing pigeons and Figurita pigeons) were investigated. METHODS T1 and T2 relaxation times were determined for nine functionally equivalent brain regions in a...

The present study is concerned with the variational principle and plane wave propagation in double porous thermoelastic infinite medium. Lord-Shulman theory [2] of thermoelasticity with one relaxation time has been used to investigate the problem. It is found that for two dimensional model, there exists four coupled longitudinal waves namely longitudinal wave (P), longitudinal thermal wave (T),...

The paper discusses some N Q R / N M R studies performed on Y B a C u O superconductors at the University of Zürich. In particular, we review studies performed in Y 2 B a 4 C u 7 0 1 5 by measuring various planar Cu N Q R / N M R parameters: the spin-lattice relaxation time, the Knight shift and the indirect component of the Gaussian contr ibution to the spin-spin relaxation time. The temperatu...

Background Changes in the longitudinal relaxation time (T1) of the myocardium are considered an important imaging-based biomarker to detect and quantify diffuse fibrosis. Several sequences have been suggested to measure myocardial T1 values [1]. However, T1 measurements are often influenced by the presence of intramyocardial or epicardial fat [2,3,4]. The aim of this study was to minimize the e...

The spin-lattice relaxation time T\ of 2 , N a N M R in dehydrated zeolite NaY has been measured from 26 to 300 K. The magnetization recovery curve is not single-exponential at all measured temperatures and 1 increases in proportion to the square of temperature above 200 K. The result is analyzed with a theory of the Raman process based on covalency. The value of T\ is compared with that of NaX...

Measurements of the proton spin-lattice relaxation time, Tx , in polycrystalline NH4Re04 have shown that mechanical sample rotation in the static magnetic field reduces 2\ for proton magnetic resonance frequencies within the range 30 — 42 MHz. The rotation induced proton spin-lattice relaxation times, ?Y, were measured at different Larmor frequencies, sample rotation frequencies, and temperatur...

We report extensive B and Be nuclear magnetic resonance ~NMR! spin-lattice relaxation time (T1) and Knight shift measurements in the heavy-fermion superconductor UBe132xBx (x50.030, 0.067). Data were acquired over a broad temperature ~T! range spanning 0.096–300 K in both the normal and superconducting states. In the normal state, the B T dependence of T1 displayed several energy scales. In a n...

The spin-lattice relaxation time, TX, of the 2 3 N a N M R line in N a N 0 2 is measured between 25 K and 160 K at two magnetic field strengths, 1.1 T and 6.9 T. The temperature dependence of TX for the center line, observed on a polycrystalline sample prepared by precipitation from aqueous solution, is given by a monotonous curve. Tx increases gradually as the temperature decreases. On the oth...

It was shown that by means of the two-pulse sequence, the spin system of a liquid entrapped into nanosize cavities can be prepared in quasi-equilibrium states of high dipolar order, which relax to thermal equilibrium with the molecular environment with a relaxation time T1d. Measurements of the inverse dipolar temperature and spin-lattice relaxation time in the local fields provide an important...

Magnetoplasmonic nanoparticles, composed of a plasmonic layer and a magnetic core, have been widely shown as promising contrast agents for magnetic resonance imaging (MRI) applications. However, their application in low-field nuclear magnetic resonance (LFNMR) research remains scarce. Here we synthesised γ-Fe2O3/Au core/shell (γ-Fe2O3@Au) nanoparticles and subsequently used them in a homemade, ...