1, 4-Diazabicyclo [2.2.2] octane (DABCO) was employed as a catalyst for one-pot synthesis of pyrano[2,3-d] pyrimidinone derivatives and MWNT- pyrimidinones from condensation reactions of aromatic aldehydes, malononitrile and thiobarbituric acid and MWNT-COCl . This method delivers the advantages of a simple method, environment friendly procedure, mild reaction conditions and high returns. The m...

magnesium oxide nanotubes of finite length are investigated by the density functional theory (dft) at the b3lyp/6-31g (d) level. the (6, 0) zigzag and (4, 4) armchair of mgo nanotubes were considered and nuclear magnetic resonance properties including isotropic and anisotropic chemical shielding parameters (csi and csa) were calculated for 25mg and 17o atoms of the optimized structures for the ...

Quantum dense coding has been demonstrated experimentally in terms of quantum logic gates and circuits in quantum computation and NMR technique. Two bits of information has been transmitted through manipulating one of the maximally entangled two-state quantum pair, which is completely consistent with the original ideal of Bennett-Wiesner proposal. Although information transmission happens betwe...

Hydrogen is present (IbundanLly in biological tis~uc. Protons posse~s two fundamental physical properlie~, (i) spin (L) LInd (ii) a small magnetic movement ( 11). Therefore the ,Homic nuclei or hydrogcn behave like tiny spi nn ing magnets. Our eart h is al~o (l n examplt: of such a magnet ic spinning top. When they a re placed in a sIalic magnetic Ilcld (Fig. I), the nudcl align themselves para...

G. Neyens,1 N. Coulier,1 S. Teughels,1 G. Georgiev,1 B. A. Brown,2,3 W. F. Rogers,4 D. L. Balabanski,1,* R. Coussement,1 A. Lépine-Szily,5 M. Lewitowicz,6 W. Mittig,6 F. de Oliveira Santos,6 P. Roussel-Chomaz,6 S. Ternier,1 K. Vyvey,1 and D. Cortina-Gil7 1University of Leuven, Instituut voor Kern-en Stralingsfysika, Celestijnenlaan 200 D, B-3001 Leuven, Belgium 2Department of Physics and Astron...

What we call “nuclear magnetic resonance” (NMR) was developed simultaneously but independently by Edward Purcell and Felix Bloch in 1946. The experimental method and theoretical interpretation they developed is now called “continuous-wave NMR” (CWNMR). A different experimental technique, called “pulsed NMR” (PNMR), was introduced in 1950 by Erwin Hahn. Pulsed NMR is used in magnetic resonance i...

Nuclear Magnetic Resonance (NMR) cryoporometry is a technique for non-destructively determining pore size distributions in porous media through the observation of the depressed melting point of a confined liquid. It is suitable for measuring pore diameters in the range 2 nm – 1 μm, depending on the absorbate. Whilst NMR cryoporometry is a pertabative measurement, the results are independent of ...

This review covers the progress in the field of NMR imaging (NMRI), NMR microimaging, NMR microscopy or MR (micro) tomography as well as MRI (Magnetic Resonance Imaging) over a period from June 2005 to may 2006 and is a continuation of the report from last year. The word ‘‘MRI’’ was used mostly in the medical or clinical field, but recently many authors in non-medical field uses ‘‘MRI’’ instead...