نتایج جستجو برای: nuclear magnetism
تعداد نتایج: 246031 فیلتر نتایج به سال:
Interface magnetism and topological structure of Fe on organic semiconductor film (Alq3) have been studied compared with deposited directly Si (100) substrate. To get information the diffused layer at Fe/Alq3 interface, grazing incident nuclear resonance scattering (GINRS) measurements are made depth selective by introducing a 95% enriched thin 57Fe producing x-ray standing wave within layered ...
in the present study, the effect of e-64 at different concentrations (0.5, 1, 5 and 10 µm) added to (1) the ivm medium on oocyte nuclear maturation and developmental competence of ovine oocytes, and (2) to the ivc medium on embryonic development of ovine embryos were investigated.
The violation of mirror symmetry in the weak force provides a powerful tool to study the internal structure of the proton. Experimental results have been obtained that address the role of strange quarks in generating nuclear magnetism. The measurement reported here provides an unambiguous constraint on strange quark contributions to the proton's magnetic moment through the electron-proton weak ...
9 A . HUDSON and H . A . HUSSAIN, M o l . Phys . 16 , 1 9 9 [ 1 9 6 9 ] . 10 R . FREEMAN, S. WITTEKOEK, and R . R . ERNST, J. C h e m . Phys. 52, 1529 [1970]. 11 A. ABRAGAM, Principles of Nuclear Magnetism, Clarendon Press, Oxford 1961. 12 P. S. HUBBARD, Phys. Rev. 131, 275 [1963]. 13 S. H. GLARUM, private communication. 14 M. LEHNIG, Ph. D. Thesis, Universität Zürich 1972. 15 a) G. L. CLOSS, J...
tio2 /fe3o4 nanocomposites with various tio2:fe3o4 ratios were synthesized by an ultrasonic-assisted deposition-precipitation method and their uv-light decolorization of congo dye and magnetic separation were investigated. the nanocomposite samples were characterized by scanning electron microscopy (sem), powder x-ray diffraction (xrd), surface area analayzer (bet) and fourier transform infrare...
در بررسی و مطالعات مغزی و به منظور شناخت بیمارهای مغزی، از روش های مختلفی مانند تصویر برداری استفاده می شود. شناخت دقیق و به موقع بیماریهای مغزی، به منظور درمان صحیح و افزایش شانس درمان، بسیار مهم می باشد. بیماریهای مغزی را می توان به دو دسته آناتومیک و متابولیک تقسیم نمود. برای مطالعات آناتومیکی می توان از روشهای توموگرافی کامپیوتری با اشعه ایکس و یا رزونانس مغناطیسی هسته ای استفاده نمود. با ت...
We present transport measurements of cleaved edge overgrowth GaAs quantum wires. The conductance of the first mode reaches 2e(2)/h at high temperatures T≳10 K, as expected. As T is lowered, the conductance is gradually reduced to 1e(2)/h, becoming T independent at T≲0.1 K, while the device cools far below 0.1 K. This behavior is seen in several wires, is independent of density, and not altered ...
The microscopic magnetism of BaVS3, which undergoes a metal-insulator transition at TMI = 70K, has been investigated by using V nuclear resonance and neutron scattering. At 1.4K, we observed zero-field resonance signals in a low-frequency range, which were interpreted as being NQR, i.e., the absence of a static hyperfine field. On the other hand, we found magnetic Bragg peaks below 30K, indicat...
Electron-electron interactions are at the origin of many exotic electronic properties of materials which have emerged from recent experimental observations. The main important phenomena discovered are related with electronic magnetic properties, which have been quite accessible to Nuclear Magnetic Resonance techniques. Those specifically permit to distinguish the orbitals or electronic bands re...
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