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排序方式: 共有264条查询结果,搜索用时 62 毫秒
81.
A potential anticancer heterodinuclear ruthenium(II)–platinum(II) complex, [ruthenium(II)(4,4′-dimethyl-2,2′-bipyridine)2(5-(l-cysteine-methyl ester)-1,10-phenanthroline)-trans-chlorodiammineplatinum(II)] chloride, [Ru(Me2bipy)2(5-(l-cysteine-Me)-phen)-trans-Pt(NH3)2Cl]Cl3, was synthesised. l-Cysteine methyl ester was used to link the two metal centres, as more conventional straight chain diaminoalkanes and 2-mercaptoethylamine failed to couple to the phenanthroline ligand. From the precursor mononuclear ruthenium(II) complexes, which were separated into their Δ- and Λ-isomers by column chromatography, the dinuclear complex was synthesised and characterised by 1H and 13C NMR, UV–Vis, circular dichroism, fluorescence and electrospray ionisation mass spectrometry. 相似文献
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Yu Y Nakada D Lee JC Singh B Crankshaw DS Orlando TP Berggren KK Oliver WD 《Physical review letters》2004,92(11):117904
We measured the intrawell energy relaxation time tau(d) approximately 24 micros between macroscopic quantum levels in the double well potential of a Nb persistent-current qubit. Interwell population transitions were generated by irradiating the qubit with microwaves. Zero population in the initial well was then observed due to a multilevel decay process in which the initial population relaxed to lower energy levels during the driven transitions. The decoherence time, estimated from tau(d) within the spin-boson model, is about 20 micros for this configuration with a Nb superconducting qubit. 相似文献
87.
Onuki A 《Physical review letters》2005,94(5):054501
We present a dynamic van der Waals theory. It is useful to study phase separation when the temperature varies in space. We show that, if heat flow is applied to liquid suspending a gas droplet at zero gravity, a convective flow occurs such that the temperature gradient within the droplet nearly vanishes. As the heat flux is increased, the droplet becomes attached to the heated wall that is wetted by liquid in equilibrium. In one case corresponding to partial wetting by gas, an apparent contact angle can be defined. In the other case with larger heat flux, the droplet completely wets the heated wall expelling liquid. 相似文献
88.
Akira Onuki 《Physics letters. A》1977,64(1):115-116
In the presence of a shear flow the order parameter fluctuations are distorted and suppressed by the shear and there appears a new correlation length independent of temperature sufficiently near the critical point. 相似文献
89.
Experimental studies of the surface phonons for single crystals and evaporated films of LiF by means of the low energy electron loss spectroscopy are reported. The results on the dispersion of surface phonons are found to agree fairly well with the Fuchs and Kliewer theory on surface mode phonons of LiF thin slabs. 相似文献
90.
Bel R Behnia K Nakajima Y Izawa K Matsuda Y Shishido H Settai R Onuki Y 《Physical review letters》2004,92(21):217002
We present a study of Nernst and Seebeck coefficients of the heavy-fermion superconductor CeCoIn5. Below 18 K, concomitant with a field-dependent Seebeck coefficient, a large sublinear Nernst signal emerges with a magnitude drastically exceeding what is expected for a multiband Fermi-liquid metal. In the mixed state, in contrast with all other superconductors studied before, this signal overwhelms the one associated with the motion of superconducting vortices. The results point to a hitherto unknown source of transverse thermoelectricity in strongly interacting electrons. 相似文献