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Changwu Zheng,Huijun Han,Aiqin Gao,Meng Ju,Aiqin Hou,Kongliang Xie 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2
Designing photochromic molecules to improve color sensitivity and reversibility of functional materials in the solidifiedstate is still a major challenge. In this work, a series of photochromic molecules containing-spiropyran with different freevolume groups have been designed and synthesized by introducing flexible spacers. The relationship of the photosensitivityand molecular free volume was investigated and the excellent reversible photoswitching molecules in both solution andsolid state were obtained. The photosensitivity of the molecules increased with the increase of molecular free volume. Thephotochromic equilibrium time of the molecule with longer alkyl chain reduced from the 330 s to 60 s, and the recoveringequilibrium time reduced from the 480 s to 40 s. The photosensitivity enhancement mechanism was explained by densityfunctional theory and molecular volume calculations. The designed photochromic molecules were applied to polyesterfabrics. The photochromic materials with excellent photosensitivity and good reversibility were obtained, which exhibitedhigh contrast and sensitive reversible color changes. The photochromic materials have potential applications in the field ofsmart textiles, optical devices, anti-counterfeiting, etc.
Removal of line artifacts on mesh boundary in computer generated hologram by mesh phase matching.
Park, Jae-Hyeung,Yeom, Han-Ju,Kim, Hee-Jae,Zhang, HuiJun,Li, BoNi,Ji, Yeong-Min,Kim, Sang-Hoo Optical Society of America 2015 Optics express Vol.23 No.6
<P>Mesh-based computer generated hologram enables realistic and efficient representation of three-dimensional scene. However, the dark line artifacts on the boundary between neighboring meshes are frequently observed, degrading the quality of the reconstruction. In this paper, we propose a simple technique to remove the dark line artifacts by matching the phase on the boundary of neighboring meshes. The feasibility of the proposed method is confirmed by the numerical and optical reconstruction of the generated hologram.</P>
Comparison of conventional lateral cephalograms with corresponding CBCT radiographs
Park, Chang-Seo,Park, Jae-Kyu,Kim, Huijun,Han, Sang-Sun,Jeong, Ho-Gul,Park, Hyok Korean Academy of Oral and Maxillofacial Radiology 2012 Imaging Science in Dentistry Vol.42 No.4
Purpose: This study was performed to assess the compatibility of cone beam computed tomography (CBCT) synthesized cephalograms with conventional cephalograms, and to find a method for obtaining normative values for three-dimensional (3D) assessments. Materials and Methods: The sample group consisted of 10 adults with normal occlusion and well-balanced faces. They were imaged using conventional and CBCT cephalograms. The CBCT cephalograms were synthesized from the CBCT data using OnDemand 3D software. Twenty-one angular and 12 linear measurements from each imaging modality were compared and analyzed using paired-t test. Results: The linear measurements between the two imaging modalities were not statistically different (p>0.05) except for the U1 to facial plane distance. The angular measurements between the two imaging modalities were not statistically different (p>0.05) with the exception of the gonial angle, ANB difference, and facial convexity. Conclusion: Two-dimensional cephalometric norms could be readily used for 3D quantitative assessment, if corrected for lateral cephalogram distortion.
Wang, Yina,Zhang, Fangfang,Zhao, Guoyan,Zhao, Yingao,Ren, Yangyang,Zhang, Huijun,Zhang, Linyu,Du, Jimin,Han, Yumin,Kang, Dae Joon Elsevier 2019 CERAMICS INTERNATIONAL Vol.45 No.6
<P><B>Abstract</B></P> <P>We report a successful fabrication of low-cost, high-efficient, structurally-rigid, porous WO<SUB>3</SUB> photoelectrochemical (PEC) catalysts using polystyrene as the template by a sol-gel method and a high-temperature annealing treatment. The scanning electron microscopy and Brunauer-Emmett-Teller surface analysis results indicate that such WO<SUB>3</SUB> monoliths possess a porous structure and a large specific surface area, which can supply lots of photogenerated charge transfer pathways as well as more surface PEC active sites. Compared with a commercially available WO<SUB>3</SUB>, our highly porous WO<SUB>3</SUB> PEC catalysts show an excellent PEC water splitting activity. Particularly, the porous WO<SUB>3</SUB> photoanodes calcinated in the presence of oxygen atmosphere at 450 °C for 7 h show the best PEC performance exhibiting the photocurrent density of 0.97 mA/cm<SUP>2</SUP> at 1.23 V versus reversible the hydrogen electrode and the incident photon-to-current conversion efficiency up to 48.9% at 420 nm in 0.5 M Na<SUB>2</SUB>SO<SUB>4</SUB> electrolyte under AM 1.5 G irradiation. Such excellent PEC performance is due to the high porosity of the WO<SUB>3</SUB>, promoting the fast transfer and the separation rate of photogenerated carriers during the PEC water splitting process.</P>