3,747 research outputs found
Sleep habits and excessive daytime sleepiness correlate with injury risks in the general population in Taiwan
No full textThe affinity of Si-N and Si-C bonding in amorphous silicon carbon nitride (a-SiCN) thin film
No full text
Effects of the Thread Depth, Taper Shape, and Taper Length on the Mechanical Properties of Mini-Implants. American Journal of Orthodontics & Dentofacial Orthopedics: 141:279-288. (SCI)
No full text
Condensation-ring Expansion Reaction of Formyl[2.2.1]bicyclic Carbinols with Para-substituted Phenyl Amines: Application to the Preparation of [3.2.1]bicyclic N-aryl-1,2,3-oxathiazolidine-2-oxide Agents
No full text[[abstract]]Individual reaction of camphene-derived endo-formyl[2.2.1]bicyclic carbinol and that of camphor-derived exo-formyl[2.2.1]bicyclic carbinol with parent and para-substituted phenyl amines gave regio- and stereospecific corresponding [3.2.1]bicyclic (para-substituted) phenyl amino ketones. Mechanism of each reaction was discussed. Some camphor-derived [3.2.1]bicyclic amino ketones were reduced to [3.2.1]bicyclic (para-substituted) phenyl amino alcohols, which were then treated with mesyl chloride to provide [3.2.1]bicyclic N-phenyl/aryl-1,2,3-oxathiazolidine-2-oxide agents. The mechanism of this final reaction was discussed as well.[[note]]SC
Hardness of T-carbon: Density functional theory calculations
No full textWe reconsider and interpret the mechanical properties of the recently proposed allotrope of carbon, T-carbon [Sheng et al., Phys. Rev. Lett. 106, 155703 (2011)], using density functional theory in combination with different empirical hardness models. In contrast with the early estimation based on Gao et al.'s model, which attributes to T-carbon a high Vickers hardness of 61 GPa comparable to that of superhard cubic boron nitride (c-BN), we find that T-carbon is not a superhard material, since its Vickers hardness does not exceed 10 GPa. Besides providing clear evidence for the absence of superhardness in T-carbon, we discuss the physical reasons behind the failure of Gao et al.'s and Simunek and Vackar's (SV) models in predicting the hardness of T-carbon, residing in their improper treatment of the highly anisotropic distribution of quasi-sp(3)-like C-C hybrids. A possible remedy for the Gao et al. and SV models based on the concept of the superatom is suggested, which indeed yields a Vickers hardness of about 8 GPa
Photoconductivity and highly selective ultraviolet sensing features of amorphous silicon carbon nitride thin films
No full textOptical Properties and Photoconductivity of Amorphous SiCN Thin Film and its Application for UV Detection
No full text- …
