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A novel molecule template assisted chemical co-reduction method has been successfully developed for the controlled synthesis of ultrathin beta-SiC single-crystalline nanowires on a large scale. The ultrathin beta-SiC single-crystalline nanowires are about 8 nm in diameter and 200-800 nm in length. The resulting thin beta-SiC single-crystalline nanowire is new in the family of beta-SiC one-dimensional (1D) nanostructures. A synergistic action of pi-stacking and steric hindrance result from the 1,10-phenanthroline molecule template are proposed to explain the growth mechanism of the ultrathin beta-SiC single-crystalline nanowires based on the experimental observation. Importantly, such ultrathin beta-SiC nanowire has shown a strong structure-induced enhancement of photoluminescence properties and has exhibited a very strong green light emission, which can be seen by naked eye. Furthermore, the unique beta-SiC ultrathin nanowire structure exhibits a low turn-on field (3.57 V microm(-1)) and a large field-emission current density (20 mA cm(-2)). These results suggest that the ultrathin beta-SiC nanowires can be expected to find promising applications as field emitters and photoelectronic devices.

Mutual information can measure arbitrary statistical dependencies. It has been applied to many kinds of fields widely. But when mutual information is used as the correlation measure, the features with more values are apt to be chosen. To solve this problem, a novel definition of correlation degree is proposed in this paper. It can avoid the shortcoming of selecting more value features when mutual information acted as the measure, and it can avoid the shortcoming of selecting less value features when correlation degree coefficients acted as the measure. In the method using the novel definition, the number of selected features is determined by the correct classification rate of Support Vector Machine. At last, the efficiency of the method is illustrated through analyzing the symptoms combination of seven essential elements of the syndrome corresponding to stroke.

A general and facile synthetic route has been developed to prepare 1D semiconductor nanomaterials in a binary solution of distilled water and ethanol amine. The influence of the volume ratio of mixed solvents and reaction temperature on the yield and final morphology of products was investigated. Significantly, this is the first time that wurtzite ZnSe ultrathin nanobelts have been synthesized in solution. It has been confirmed that the photocatalytic activity of ZnSe nanobelts in the photodegradation of the fuchsine acid is higher than that of TiO(2) nanoparticles. The present work shows that the solvothermal route is facile, cheap, and versatile. Thus, it is very easy to realize scaled-up production, and brings new light on the synthesis and self-assembly of functional materials.

A novel complex-assisted hydrothermal route is presented to fabricate ultralong Ag/C nanocables with length ranging from 100 to 180 microm on a large scale, based on the reaction of sulfamic acid silver and salicylic acid. By chemical etching of these Ag/C nanocables, high-quality carbonaceous nanotubes can be obtained at room temperature. Using the as-prepared Ag/C nanocables as templates, a new strategy for introducing guest materials into hollow nanotubes is addressed. We take Ag(2)Se as an example and validate the feasibility of this strategy. All of the products are characterized in detail by multiform techniques: X-ray diffraction, Fourier transform IR, energy-dispersive X-ray analysis, field emission scanning electron microscopy, transmission electron microscopy (TEM), and high-resolution TEM. The formation mechanisms of these products are tentatively proposed.

The gamma-AIOOH (boehmite) nanofiber bundles have been synthesized via a convenient quencher method. Most nanofibers contain even smaller nanowires with an average diameter of 5 nm. A series of contrast experiments reveal that the evolvement from nanosheets to nanofibers occurs in the quencher process. gamma-Al2O3 nanofiber bundles with mesoporous character can be obtained by calcining relevant gamma-AlOOH nanostructures at 500 degrees C.