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221.
Luiz G. Bonato Raphael F. Moral Gabriel Nagamine Arthur Alo Jos C. Germino Douglas S. da Silva Diogo B. Almeida Luiz F. Zagonel Fernando Galembeck Lzaro A. Padilha Ana Flvia Nogueira 《Angewandte Chemie (International ed. in English)》2020,59(28):11501-11509
CsPbX3 perovskite nanoplates (PNPLs) were formed in a synthesis driven by SnX4 (X=Cl, Br, I) salts. The role played by these hard Lewis acids in directing PNPL formation is addressed. Sn4+ disturbs the acid–base equilibrium of the system, increasing the protonation rate of oleylamine and inducing anisotropic growth of nanocrystals. Sn4+ cations influence the reaction dynamics owing to complexation with oleylamine molecules. By monitoring the photoluminescence excitation and photoluminescence (PL) spectra of the PNPLs grown at different temperatures, the influence of the thickness on their optical properties is mapped. Time‐resolved and spectrally resolved PL for colloidal dispersions with different optical densities reveals that the dependence of the overall PL lifetime on the emission wavelength do not originate from energy transfer between PNPLs but from the contribution of PNPLs with distinct thickness, indicating that thicker PNPLs exhibit longer PL lifetimes. 相似文献
222.
Piotr Kaszynski Adam Januszko Kiminori Ohta Takashi Nagamine Piotr Potaczek Victor G. Young 《Liquid crystals》2013,40(10):1169-1190
Three series of diesters of 4‐alkoxyphenols containing 12‐vertex p‐carborane (1A[n], n = 1–22), 10‐vertex p‐carborane (1B[n], n = 1–12) or bicyclo[2.2.2]octane (1C[n], n = 1–12) as the central structural element were prepared and investigated by optical and calorimetric methods. All carborane diesters exhibited exclusively nematic behaviour, whereas the carbocyclic analogues 1C[n] and also cyclohexane (1D[n]) and benzene (1E[n]) derivatives, showed early onset of SmA phase and complete disappearance of nematic behaviour. The isotropic transition temperatures, T MI, for the five series of mesogens were analysed numerically using a three‐parameter exponential function. The resulting limiting values, T MI(∞), provided a quantitative assessment of the central element ability to support the mesogenic state. They demonstrated that, whereas the T MI(∞) values for the carbocycles, C, D, and E, are around 125°C, for carboranes A and B this value is 70±2°C and 49±19°C, respectively. Two types of comparative analysis of trends in T MI relative to those of the terephthalate series 1E[n] demonstrated abnormal behaviour of both carborane series (1A[n] and 1B[n]) and also the cyclohexane series (1D[n]). The former showed progressive destabilisation of the mesophase, whereas the series 1D[n] exhibited increasing mesophase stability relative to 1E[n] with increasing chain length. Both of these effects were explained using conformational analysis of theoretical models and experimental molecular structures for 1A[3], 1B[4] and 1C[4]. The increasing relative destabilisation of the mesophase in the carborane derivatives was rationalised by the high order rotational axes in A and B and D 4d symmetry for B. The trend of the ΔT MI values for series 1D[n] was explained with the existence of the equatorial‐axial conformational equilibrium for the cyclohexane derivatives. The clearing temperatures for the hypothetical pure diequatorial conformers 1D[n]‐ee were estimated. 相似文献
223.
M. Behar C. D. Denton R. C. Fadanelli I. Abril E. D. Cantero R. Garcia-Molina L. C. C. Nagamine 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2010,59(2):209-213
We report the results of an experimental-theoretical study on the stopping
power of ZrO2 films for swift H and He ion beams. The experiments,
using the Rutherford Backscattering technique, were done for protons with
incident energies in the range 200–1500 keV and for α-particle beams
with energies in the range 160–3000 keV. The theoretical calculations were
done in the framework of the dielectric formalism using the MELF-GOS model
to account for the ZrO2 target electronic response. It is shown that
for both ion beams, the agreement between theory and experiment is quite
remarkable. 相似文献