Understanding NMR Spectroscopy phần 9 pps

... A 105, 167-183 ( 199 3) ). Here, we note the following features. (a) The optimum dephasing is obtained when the extra offset induced 9 29 doubles the length of the phase cycle. 9. 5.7 Shifting the ... 1st pulse 2nd pulse 3rd pulse receiver 10000 2 90 90 0 180 3 180 180 0 0 4 270 270 0 180 This is exactly the cycle proposed in section 9. 5.5.4. 9. 5 .9 Further examples In this section...

Ngày tải lên: 14/08/2014, 09:21

... radians (90 °) is the same thing as a sine wave. Thus, in the EXSY experiment the effect of changing the phase of the first pulse by 90 ° can be described as a phase shift of the signal by 90 °. Suppose ... may just as well write Mnn z =− () α β [2] † Chapter 8 "Relaxation" © James Keeler 199 9 and 2002 α β x y z A population difference gives rise to net magnetization along the...

Ngày tải lên: 14/08/2014, 09:21

... zero. I Ω I Ω S Ω S Ω F 1 F 2 {a} {b} {c} 0 9 1 9 Coherence Selection: Phase Cycling and Gradient Pulses † 9. 1 Introduction The pulse sequence used in an NMR experiment is carefully designed to produce ... then uses coherence transfer pathways to specify the desired outcome of the experiment. 9. 2 Phase in NMR In NMR we have control over both the phase of the pulses and the receiv...

Ngày tải lên: 14/08/2014, 09:21

... 0 2 90 90 0 0 90 270 3 180 –180 0 0 –180 180 4 270 –270 0 0 –270 90 5 0 0 90 180 180 180 6 90 90 90 180 90 90 7 180 –180 90 180 0 0 8 270 –270 90 180 90 270 9 0 0 180 360 360 0 10 90 90 180 ... 90 90 180 360 270 270 11 180 –180 180 360 180 180 12 270 –270 180 360 90 90 13 0 0 270 540 540 180 14 90 90 270 540 450 90 15 180 –180 270 540 360 0 16 270 –270 270 540 270 270 In...

Ngày tải lên: 14/08/2014, 09:21

... of time value of money; therefore, they argue that either Islamic 2 See Maududi, 198 2– 199 1, 1, pp. 382, 383 (4: 92 ). An Appraisal of Common Criticism 443 Preference versus Permissibility of Various ... losses to life and wealth. While Islamic banking emerged in the 196 0s and early 197 0s, Islamic insurance started no earlier than 197 9. This reveals that the Takaful system developed in...

Ngày tải lên: 09/08/2014, 16:21

... Shaikh Jad al-Haq Ali Jad al-Haq in 199 5 (al-Iqtisadul Islami, July 199 5) Against life insurance Fatwah issued in a judicial conference held in Makkah in Shaban 1 398 AH Against the validity of insurance The ... time value of money; therefore, they argue that either Islamic 2 See Maududi, 198 2– 199 1, 1, pp. 382, 383 (4: 92 ). 422 Understanding Islamic Finance 16.3.1 Main Objective of t...

Ngày tải lên: 14/08/2014, 05:20