http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hydrothermal synthesis of titanate nanostructures with high UV absorption characteristics
Nawin Viriya-Empikul,Noriaki Sano,Takeyuki Kikuchi,Sareeya Bureekaew,Wiwut Tanthapanichakoon,Tawatchai Charinpanitkul 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.1
The titanate nanostructures with high UV absorption characteristics could be fabricated by hydrothermal method within a temperature range of 90–150 8C. TEM, XRD, BET analyses, and UV–vis spectroscopy were employed to elucidate the synthesized titanate nanostructure characteristics which were microstructure, phase transformation, specific surface area, and band gap energy, respectively. With an increase in the hydrothermal treating temperature from 90 to 120 8C, the specific surface area of titanate nanostructures was increased from 83 to 258 m2/g,while the band gap energy of titanate nanostructures was increased from 3.44 to 3.84 eV and then slightly decreased to 3.81 eV at 150 8C. The fabricated titanate nanostructures could exhibit higher UV adsorption capability but lower photocatalytic activity when compared with that of commercial TiO2 powders.
3D scanning based mold correction for planar and cylindrical parts in aluminum die casting
Seno, Takashi,Ohtake, Yutaka,Kikuchi, Yuji,Saito, Noriaki,Suzuki, Hiromasa,Nagai, Yukie Society for Computational Design and Engineering 2015 Journal of computational design and engineering Vol.2 No.2
Aluminum die casting is an important manufacturing process for mechanical components. Die casting is known to be more accurate than other types of casting; however, post-machining is usually necessary to achieve the required accuracy. The goal of this investigation is to develop machining- free aluminum die casting. Improvement of the accuracy of planar and cylindrical parts is expected by correcting metal molds. In the proposed method, the shape of cast aluminum made with the initial metal molds is measured by 3D scanning. The 3D scan data includes information about deformations that occur during casting. Therefore, it is possible to estimate the deformation and correction amounts by comparing 3D scan data with product computer-aided design (CAD) data. We corrected planar and cylindrical parts of the CAD data for the mold. In addition, we corrected the planar part of the metal mold using the corrected mold data. The effectiveness of the proposed method is demonstrated by evaluating the accuracy improvement of the cast aluminum made with the corrected mold.