Paleogeothermal gradient estimation by spin-lattice relaxation time (T1) of kerogen.
نویسندگان
چکیده
منابع مشابه
TEMPERATURE AND FREQUENCY DEPENDENCES OF NMR SPIN-LATTICE RELAXATION TIME T1 IN a-Si : H
Carlos and Taylor have recently reported pulsed ' H NMR measurements on the spin-lattice relaxation time T for the hydrogen atoms in glow discharge prepared a-Si:H. They have measured 40th the magnitude and the temperature and frequency dependences of T1 and observed a number of interesting features. Among these are the presence of an asymmetric minimum in T1 at a temperature T . near 40K which...
متن کاملMR Estimation of Longitudinal Relaxation Time (T1) in Spoiled Gradient Echo Using an Adaptive Neural Network
Introduction: The acquisition of high-resolution T1 maps in a clinically feasible time frame has been demonstrated with Driven Equilibrium Single Pulse Observation of T1 (DESPOT1) [1-3]. DESPOT1 derives the longitudinal relaxation time, T1, from two or more spoiled gradient recalled echo (SPGR) images acquired with a constant TR and different flip angles [2, 3]. In general, T1 can be estimated ...
متن کاملTemperature dependence of the Spin-Lattice Relaxation Time
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...
متن کاملcomparison of maximum signal intensity of magnevist contrast agent in modified t1 weighted spin echo, t1 weighted fast spin echo and t1 weighted gradient echo sequences
background: nowadays mri examinations have been widely used in clinical applications for many diagnoses. the use of contrast agent in mri improves lesion detection and characterization and causes more accurate diagnosis. objectives: the aim of this study was comparing to optimal dose of magnevist contrast agent in modified t1w se (spin echo), t1w fse (fast spin echo) and t1w gre (gradient ech...
متن کاملSpin-Lattice Relaxation Below IK
NMR experiments at very low temperatures have been carried out for a long time, generally not as a general purpose method for analyzing structure and dynamics but rather as a convenient diagnostic tool in the study of substances whose special properties at very low temperatures are of interest. These include most prominently solid hydrogen and solid and liquid helium-3. It must always have been...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of the Japanese Association for Petroleum Technology
سال: 1988
ISSN: 1881-4131,0370-9868
DOI: 10.3720/japt.53.251