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排序方式: 共有102条查询结果,搜索用时 15 毫秒
1.
2.
The electrical resistivities and Hall constants of the semiconducting compounds SnS2?xSex have been measured at temperatures ranging from 100 to 450 K and three donor ionization energies (0.013, 0.086 and 0.25 eV) have been identified. The Hall mobilities exhibit for T> 200K a temperature dependence of the form μ~ (T/T0)?n separating the SnS2?xSex compounds into two groups one behaving like SnS2 and the other like SnSe2. 相似文献
3.
Jean-Pierre Aubin Giuseppe Da Prato 《NoDEA : Nonlinear Differential Equations and Applications》1995,2(4):511-525
This paper is devoted to stability properties of solutions to stochastic differential equations obtained by a stochastic Lyapunov method. 相似文献
4.
The ionized-impurity mobility of Cd3As2 at 4.2 K with carrier concentration lying in the range 1018–1019 cm?3 has been calculated taking into account the inverted HgTe-type energy band structure of this material. A comparison of the results with experimental mobility data leads to a static dielectric constant of ?0 = 36. This value represents a lower limit since any compensation effects would increase the fitted estimate of ?0. 相似文献
5.
Jean-Louis Tassoul Gilles Aubin 《Journal of Mathematical Analysis and Applications》1974,45(1):116-126
This paper deals with finite-amplitude axisymmetric disturbances in a self-gravitating fluid column of finite radius R. It is shown that the cutoff wavelength λnl above which gravitational breakup occurs now depends on the relative amplitude of the initial perturbation. Actually, for small-but finite-amplitude disturbances, , where λl ( = 5.8898R) designates the cutoff wavelength predicted in the linear approximation. 相似文献
6.
Short peptides derived from p14ARF and Hdm2 (14 and 15 amino acids in length, respectively), two cancer associated proteins, have been found to co-assemble into amyloid-like structures. Larger protein domains containing these peptide segments interact in cells and also undergo a disorder-to-order transition upon binding in vitro. In contrast to the association of beta-strand assemblies with amyloid diseases, the system described herein utilizes the formation of binary, extended beta-strands as a novel mechanism of biomolecular assembly. The beta-strand-containing fibrils formed from these peptides may allow the directed assembly of decorated fibrils with applications as biological nanostructures. 相似文献
7.
Lengagne T Aubin T Jouventin P Lauga J 《The Journal of the Acoustical Society of America》2000,107(1):508-516
In the king penguin, Aptenodytes patagonicus, incubation and brooding duties are undertaken alternately by both partners of a pair. Birds returning from foraging at sea find their mate in the crowded colony using acoustic signals. Acoustic recognition of the mate maintains and strengthens the mate's fidelity and favors synchronization in the different stages of reproduction. In this study it was found that the king penguin vocalizes in response to the mate's playback calls, but not to those of neighbors or unfamiliar conspecific individuals. To study individual features used by the birds for individual recognition of mates, various experimental signals consisting of synthesized modifications of the mate' s call were played back to the incubating bird. Results indicated that birds attend to the FM profile of the call, in particular its initial inflexion. The frequency modulation shape of the syllable can be assimilated to a vocal signature repeated though the different syllables of the call. King penguins pay little attention to the call' s AM envelope or its absolute frequency. 相似文献
8.
Dr. Kimiaka C. Guérard Vincent Hamel Dr. Amandine Guérinot Cloé Bouchard‐Aubin Prof. Sylvain Canesi 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(50):18068-18071
A rapid route to 5,5‐ and 5,6‐ bicyclic systems is provided by an 1,3‐alkyl‐shift process mediated by a hypervalent iodine reagent on aromatics. The structures obtained contain several unsaturations with different behaviors and reactivities. Such diversity allows further elaborations for the rapid formation of compact systems present in a variety of natural products. The potential for further transformations has been demonstrated by performing a double Michael addition. This cyclization process is regio‐ and stereoselective due to the presence of a former benzylic substituent. Furthermore, an extension of this approach has been accomplished on indole derivatives. 相似文献
9.
Moreira H Yu Q Nadal B Bresson B Rosticher M Lequeux N Zimmers A Aubin H 《Physical review letters》2011,107(17):176803
We describe current-voltage (I-V) characteristics of alkyl-ligated gold nanocrystals ~5 nm arrays in a long screening length limit. Arrays with different alkyl ligand lengths have been prepared to tune the electronic tunnel coupling between the nanocrystals. For long ligands, electronic diffusion occurs through sequential tunneling and follows activated laws, as a function of temperature σ∝e(-T(0)/T) and as a function of electric field I∝e(-E(0)/E). For better conducting arrays, i.e., with small ligands, the transport properties cross over to the cotunneling regime and follow Efros-Shklovskii laws as a function of temperature σ∝e(-(T(ES)/T)(1/2) and as a function of electric field I∝e(-(E)(ES)/E)(1/2). The data show that electronic transport in nanocrystal arrays can be tuned from the sequential tunneling to the cotunneling regime by increasing the tunnel barrier transparency. 相似文献
10.