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81.
82.
A new 3,4-seco-lanostane triterpenoid,schisanlactone G (1),was isolated from the fruits of Schisandra sphenanthera.Its structure was established on the basis of extensive spectroscopic analysis.2009 Rong Tao Li.Published by Elsevier B.V.on behalf of Chinese Chemical Society.All fights reserved. 相似文献
83.
Under mild condition,using FeCl3 as catalyst,a series of functionalized diarylmethanes were prepared efficiently from the reactions of arenes with paraformaldehyde.This catalytic system is not sensitive to air and moisture. 相似文献
84.
Triangular silver nanoprisms were prepared and applied to make colorimetric detection of cysteine based on our findings that cysteine could lead to the blue shift of the dipole plasmon resonance absorption,but other 19 kinds of natural amino acids could not.Cysteine with a concentration 160 nmol/L can result in a color change that can be discerned with naked eyes. 相似文献
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88.
Friederike Hammar Norbert Schaschke Regine Willumeit 《Nachrichten aus der Chemie》2008,56(11):1108-1108
89.
M. Gholami M. Esmaeili H. Haratizadeh P. O. Holtz M. Hammar 《Opto-Electronics Review》2009,17(3):260-264
We have investigated optical properties of Ga0.64In0.36N0.006As0.994/GaAs single quantum-well structures using photoluminescence technique. We have found that nitrogen creates potential fluctuations
in the InGaNAs structures, so it is the cause of trap centres in these structures and leads to localized excitons recombination
dynamics. The near-band edge PL at 2 K exhibited a blueshift with an increase in excitation intensity of a sample but there
is not such a shift in the PL peak position energy of same sample at 150 K. It has been found that PL spectra have a large
full width at half maximum (FWHM) value at 2 K. These results are discussed in terms of carrier localization. Additionally,
our results suggest decreasing PL integrated intensity in this structure, possibly due to non-radiative recombination. It
has been shown that thermal annealing reduces the local strain created by nitrogen. By annealing process, a blue shifted emission
can be observed. 相似文献
90.
R. Katajanheimo R. Jäderholm A. Siivola T. Tuurnala E. Hammarén E. Liukkonen 《Zeitschrift für Physik A Hadrons and Nuclei》1984,316(3):361-366
Decay properties of excited states in the151Nd and155Sm nuclei produced by 10 MeV douterons have been investigated with in-beam gamma-gamma-coincidence equipment during bombardment of the150Nd and154Sm targets. The results largely confirm the data obtained earlier for these nuclei. The (d, p γ) reaction channel favors population of odd-parity low-spin levels, whose energies follow the rule of regular band structure for well-deformed nuclei. The level schemes are interpreted with calculations using an axial particle-rotor model with a Woods-Saxon potential. 相似文献