18,016 research outputs found
X-ray powder diffraction of high-absorption materials at the XRD1 beamline off the best conditions: Application to (Gd,Nd)5Si4 compounds
Representative compounds of the new family of magnetic materials Gd5-xNdxSi4
were analyzed by X-ray diffraction at the XRD1 beamline at LNLS. To reduce
X-ray absorption, thin layers of the powder samples were mounted outside the
capillaries and measured in Debye-Scherrer geometry as usual. The X-ray
diffraction analyses and the magnetometry results indicate that the behavior of
the magnetic transition temperature as a function of Nd content may be directly
related to the average of the four smallest interatomic distances between
different rare earth sites of the majority phase of each compound. The quality
and consistency of the results show that the XRD1 beamline is able to perform
satisfactory X-ray diffraction experiments on high-absorption materials even
off the best conditions.Comment: 12 pages, 3 figures, 3 table
AdubaĆ§Ć£o foliar da cultura do milho utilizando produtos multinutrientes.
bitstream/item/29702/1/Adubacao-foliar.pd
Anisotropic superconducting properties of aligned MgB2 crystallites
Samples of aligned MgB2 crystallites have been prepared, allowing for the
first time the direct identification of an upper critical field anisotropy
Hc2^{ab}/Hc2^{c}= xi_{ab}/xi_{c} ~ 1.73; with xi_{o,ab} ~ 70 A, xi_{o,c} ~ 40
A, and a mass anisotropy ratio m_{ab}/m_{c} ~ 0.3. A ferromagnetic background
signal was identified, possibly related to the raw materials purity.Comment: 4 pages, 4 figures; Revised version to appear in Phys. Rev. Let
EficiĆŖncia agronĆ“mica de compostos de aminoĆ”cidos aplicados nas sementes e em pulverizaĆ§Ć£o foliar na cultura do milho.
Amostragem de solos: a base para aplicaĆ§Ć£o de corretivos e fertilizantes.
bitstream/CNPMS/16153/1/Com_73.pd
EficiĆŖncia agronĆ“mica de compostos de aminoĆ”cidos aplicados nas sementes e em pulverizaĆ§Ć£o foliar na cultura do milho safrinha.
bitstream/item/49026/1/ct-192.pd
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