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排序方式: 共有235条查询结果,搜索用时 15 毫秒
91.
Luboš Jankovič Karol Végsö Peter Šiffalovič Ondrej Šauša Lubomír Čaplovič Mária Čaplovičová 《International Journal of Polymer Analysis and Characterization》2016,21(6):524-536
Three different polymer nanocomposites were prepared using clay modified with tetraoctylammonium (4C8) surfactant. The dispersion of clay silicate layers was studied using X-ray diffraction and small-angle scattering. Free-volume cavity sizes were studied with positron annihilation lifetime spectroscopy. Scattering methods confirmed disruption of all polymer lamellae organization upon organoclay addition and the creation of partially intercalated systems for polyamide and polycaprolactone. The presence of organoclay in the polymers enlarges the lower value of average positronium lifetime τ3 of polyamide and reduces the higher value of τ3 for polycaprolactone and polyethylene. 相似文献
92.
Ondrej Kurka 《Proceedings of the American Mathematical Society》2008,136(12):4467-4473
We show that the sets of Fréchet subdifferentiability of Lipschitz functions on a Banach space are Borel if and only if is reflexive. This answers a question of L. Zajíček.
93.
Poterya V Votava O Fárník M Oncák M Slavícek P Buck U Friedrich B 《The Journal of chemical physics》2008,128(10):104313
We report on the first observation of the organoxenon HXeCCH molecule in the gas phase. This molecule has been prepared in a molecular beam experiment by 193 nm photolysis of an acetylene molecule on Xe(n) clusters (n approximately 390). Subsequently the molecule has been oriented via the pseudo-first-order Stark effect in a strong electric field of the polarized laser light combined with the weak electrostatic field in the extraction region of a time-of-flight spectrometer. The experimental evidence for the oriented molecule has been provided by measurements of its photodissociation. For comparison, photolysis of C(2)H(2) on Ar(n) clusters (n approximately 280) has been measured. Here the analogous rare gas molecule HArCCH could not be generated. The interpretation of our experimental findings has been supported by ab initio calculations. In addition, the experiment together with the calculations reveals information on the photochemistry of the HXeCCH molecule. The 193 nm radiation excites the molecule predominantly into the 2 (1)Sigma(+) state, which cannot dissociate the Xe-H bond directly, but the system evolves along the Xe-C coordinate to a conical intersection of a slightly nonlinear configuration with the dissociative 1 (1)Pi state, which then dissociates the Xe-H bond. 相似文献
94.
Ondrej F. K. Kalenda Kenneth Kunen 《Proceedings of the American Mathematical Society》2005,133(2):425-429
Assuming the consistency of the existence of a measurable cardinal, it is consistent to have two Banach spaces, , where is a weak Asplund space such that (in the weak* topology) in not in Stegall's class, whereas is in Stegall's class but is not weak* fragmentable.
95.
Ondrej Hudák 《Physics letters. A》1981,82(2):95-96
A stable 2π-kink solution of the double sine-Gordon equation is described analytically. Commensurate-incommensurate phase transitions in systems corresponding to this equation are continuous. 相似文献
96.
The thermoreflectance of GeS has been studied in the energy range 1.2–5.2 eV at 100 and 320 K in polarized light for orientations E∥a and E∥c. The energy values of critical points have been determined from experimental curves. 相似文献
97.
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99.
Nejdl Lukas Zitka Jan Mravec Filip Milosavljevic Vedran Zitka Ondrej Kopel Pavel Adam Vojtech Vaculovicova Marketa 《Mikrochimica acta》2017,184(5):1489-1497
Microchimica Acta - The authors report on a systematic study on the low-cost, low-temperature, and fast synthesis of water soluble quantum dots (QDs) stabilized by mercaptosuccinic acid by UV... 相似文献
100.