Color center of YAlO3 with cation vacancies

Jianyu Chen,Dunhua Cao,Guangjun Zhao,Shengming Zhou 한국물리학회 2010 Current Applied Physics Vol.10 No.2

High quality pure YAlO3 crystal with dimension of Ø 30 × 50 ㎟ was grown by Czochralski technique. UV irradiation and air annealing bring additional absorption in the region 200–800 nm. The absorption spectra of perfect YAlO3 and YAlO3 containing cation vacancy (aluminium vacancy and yttrium vacancy)were calculated using density functional theory code CASTEP. Comparison of the simulated absorption spectra with the experimental absorption spectra of YAlO3 after UV irradiation and air annealing treatments shows that cation vacancies are responsible for part of the coloration on YAlO3 crystal.

Design and fabrication of custom-made dental implants

Xianshuai Chen,Longhan Xie,Jianyu Chen,R. Du,Feilong Deng 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.7

Dental implant has been attracting more and more attention due to their advantages of reliability and comfort. It is estimated that 10%of people will need dental implants in their life time. Especially, companies offer a system for customer to choice. But, no one research on custom-made dental implants. Traditional implants have their limitation and they are not better fit due to the difference of patient’s oral condition. The advantages of custom implant are accuracy fit and esthetic emergence profile. So, custom-made implant is desirable. Another key problem of custom-made dental implant is manufacturing. Dental implant is difficult to machine due to its complex features and its material (titanium). With the ever increasing demand for tight tolerance and increased complexity and accuracy, traditional machine tools have become ineffective for machining them. So, we design and built a PC-based CNC Turn-Mill-Hob professional machining center for machining our custom-made dental implants accurately and efficiently. This paper introduces our method: firstly, the custom-made dental implant in various oral conditions is designed by using our implant database. And then, FEA results indicate the stress distribution and magnitude of implant-bone interface for dentist referring. Finally, samples are automatic machined by our machining center.

Protective Effects of Enteral Nutrition Supplemented with Crassostrea hongkongensis Polysaccharides Against 5-Fluorouracil-Induced Intestinal Mucosal Damage in Rats

Bingna Cai,Peng Wang,Huili Sun,Deke Chen,Hua Chen,Xin Chen,Jianyu Pan 한국식품영양과학회 2018 Journal of medicinal food Vol.21 No.4

Chemotherapeutics, including 5-fluorouracil (5-FU), often damage the intestinal mucosal barrier and cause intestinal mucositis (IM). Supplementation with immunoregulatory polysaccharides from Crassostrea hongkongensis has been shown to positively influence the effectiveness and toxicity of 5-FU. Therefore, we studied the effects of oyster polysaccharides on 5-FU-induced intestinal mucosal damage in rats. The C30–60% ethanol-precipitated fraction of polysaccharides promoted IEC-6 cell proliferation and exhibited a maximal effect at a 0.0195 mg/mL concentration. Moreover, treatment with C30–60% polysaccharide-based nutrition formula (OPNF) partially prevented the 5-FU-induced degenerative changes in the histology and ultrastructure of small intestinal mucosa. In addition, the endotoxin level of rats fed with 5-FU and OPNF decreased to the normal control level. Furthermore, the 5-FU-induced increase of proinflammatory cytokine interleukin (IL)-2 and the decrease of anti-inflammatory cytokine IL-10 level in the peripheral blood were significantly attenuated by OPNF administration. In conclusion, Oyster C30–60% polysaccharides can ameliorate 5-FU-induced IM by partially preventing mucosal damage, reducing inflammation, and promoting immunity.

A Coaxial and Off-axial Integrated Three-mirror Optical System with High Resolution and Large Field of View

Zhe Chen,Junqing Zhu,Jiantao Peng,Xingxiang Zhang,Jianyue Ren 한국광학회 2016 Current Optics and Photonics Vol.20 No.1

A novel optical design for high resolution, large field of view (FOV) and multispectral remote sensingis presented. An f/7.3 Korsch and two f/17.9 Cook three-mirror optical systems are integrated by sharingthe primary and secondary mirrors, bias of the FOV, decentering of the apertures and reasonable structurearrangement. The aperture stop of the Korsch system is located on the primary mirror, while those ofthe Cook systems are on the exit pupils. High resolution image with spectral coverage from visible tonear-infrared (NIR) can be acquired through the Korsch system with a focal length of 14 m, whilewide-field imaging is accomplished by the two Cook systems whose focal lengths are both 13.24 m. The full FOV is 4°×0.13°, a coverage width of 34.9 km at the altitude of 500 km can then be acquiredby push-broom imaging. To facilitate controlling the stray light, the intermediate images and the real exitpupils are spatially available. After optimization, a near diffraction-limited performance and a compactoptical package are achieved. The sharing of the on-axis primary and secondary mirrors reduces the costof fabrication, test, and manufacture effectively. Besides, the two tertiary mirrors of the Cook systemspossess the same parameters, further cutting down the cost.

Ultra-thin Metallized Glass Fabric Coated with Chitosan and Reduced Graphene Oxide for Electromagnetic Shielding with Excellent Heat Dissipation and Self-Cleaning

Meimei Chen,Shan Jiang,Ce Cui,Wenhao Bai,Jianyu Zhai,Ronghui Guo 한국섬유공학회 2023 Fibers and polymers Vol.24 No.8

With the rapid development of modern technology, more and more electronic equipment had entered people’s life, causing serious electromagnetic pollution. In this study, a lightweight, ultra-thin and high electromagnetic shielding film was fabricated by copper electroless deposition after solution immersion coating method combining chitosan (CTS) and reduced graphene oxide on glass fabric (Cu/RGO-CTS-coated glass fabric). Chitosan and RGO had synergistic effect for copper deposition, enhancing electrical conductivity and electromagnetic shielding property. The prepared fabric showed superb conductivity of 8589.3 S/cm and the shielding effectiveness of the Cu/RGO-CTS-coated glass fabric showed as high as 93.6 dB at ultra-thin thickness of 92.4 μm (SSE/t = 3868.8 dB cm2 g-1). Thermal conductivity, antibacterial and hydrophobic properties were also studied. Compared with untreated glass fabric, thermal conductivity of Cu/RGO-CTS-coated glass fabric increased by 437%, protecting electronic equipment from adverse effects at high temperature. Cu/RGO-CTS-coated glass fabric had inhibitory effect on Staphylococcus aureus and Escherichia coli, which could prolong the service life and maintain the appearance of the fabric. Cu/RGO-CTS-coated glass fabric also showed hydrophobicity with self-cleaning function, making it possible for the composite material to be used in many fields such as aerospace industry, microelectronic devices, and transportation to resist electromagnetic interference in high humidity and high pollution environment.

Protective Effects of Gypenosides against Fatty Liver Disease Induced by High Fat and Cholesterol Diet and Alcohol in Rats

Renan Qin,Hong Nie,Jianyu Zhang,Chuyuan Li,Xiaoqi Zhang,Aihua Xiong,Feng Huang,Zhen Yin,Kongyan Li,Wenyu Qin,Mingzhen Chen,Shubing Zhang,Lingyi Liang,Huiye Zhang,Wencai Ye 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.7

In the present study, the protective effects of gypenosides from Gynostemma pentaphyllum on fatty liver disease (FLD) were examined in rats treated with high fat and cholesterol diet and alcohol. Male SD rats were divided into seven groups: control, model, lovastatin, silymarin, gypenosides high-, medium- and low-treatment groups. The latter 6 groups were fed high-fat and cholesterol diet and administered alcohol intragastricly once a day. Body weight was measured every week for 10 weeks, and the hepatic index was measured after 10 weeks. Compared with model group, levels of serum triglyceride (TG), total cholesterol (TC), free fatty acid (FFA), and low density lipoprotein cholesterol (LDL-C) level, malondialdehyde (MDA), serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) activity, and hepatocyte apoptosis were significantly decreased in gypenosides groups; while serum high density lipoprotein cholesterol (HDL-C), superoxide dismutase (SOD) activity in both serum and hepatic tissue and mRNA and protein level of peroxisome proliferator-activated receptor α (PPAR-α) were significantly increased. Moreover, hepatic steatosis and mitochondrial damage were improved. These results suggested that gypenosides could prevent liver fatty degeneration in fatty liver disease through modulating lipid metabolism, ameliorating liver dysfunction and reducing oxidative stress.

Lactogenic Activity of an Enzymatic Hydrolysate from Octopus vulgaris and Carica papaya in SD Rats

Bingna Cai,Hua Chen,Han Sun,Huili Sun,Peng Wang,Deke Chen,Jianyu Pan 한국식품영양과학회 2015 Journal of medicinal food Vol.18 No.11

The traditional Chinese medicine theory believes that octopus papaya soup can stimulate milk production in lactating women. The objective of this study was to determine whether dietary supplementation with an enzymatic hydrolysate of Octopus vulgaris and Carica papaya (EHOC) could increase milk production and nutritional indexes in Sprague Dawley (SD) rats. Female SD rats (n = 24) were fed a control diet (n = 8), EHOC-supplemented diet, or a positive control diet (Shengruzhi) from day 10 of pregnancy to day 10 of lactation. Maternal serum, mammary gland (day 10 of lactation), milk, and pup weight (daily) were collected for analysis. Results showed that the EHOC diet obviously elevated daily milk yield and pup weight compared to the control group (P < .05). The EHOC diet was found to increase the concentration of prolactin (PRL), progesterone (P), estradiol (E2), and growth hormone (GH) significantly in the circulation and mammary gland. Mammary glands of EHOCtreated dams showed clear lobuloalveolar development and proliferation of myoepithelial cells, but no striking variations were observed among the groups. Furthermore, the nutrition content and immune globulin concentration in the milk of EHOCsupplemented dams were higher than those of the control group, especially the cholesterol, glucose, and IgG were higher by 44.98% (P < .001), 42.76% (P< .01), and 42.23% (P < .01), respectively. In conclusion, this article demonstrates that EHOC administration has beneficial effects on milk production in the dams and on performance of the dam and pup. These results indicate that EHOC could be explored as a potentially lactogenic nutriment for lactating women.

GROUP-THEORETICAL ANALYSES OF IN-PLANE MODES IN TWO-DIMENSIONAL PHONONIC CRYSTALS

Li Cai,Xiaoyun Han,Jianyu Fang,Shengbing Chen 한국소음진동공학회 2008 한국소음진동공학회 국제학술대회논문집 Vol.2008 No.7

Integrated Optimization Design of Carbon Fiber Composite Framework for Small Lightweight Space Camera

Shuai Yang,Wei Sha,Changzheng Chen,Xingxiang Zhang,Jianyue Ren 한국광학회 2016 Current Optics and Photonics Vol.20 No.3

A Carbon Fiber Composite (CFC) framework was designed for a small lightweight space camera. According to the distribution characteristics of each optical element in the optical system, CFC (M40J)was chosen to accomplish the design of the framework. TC4 embedded parts were used to solve the lowaccuracy of the CFC framework interface problem. An integrated optimization method and the optimizationstrategy which combined a genetic global optimization algorithm with a downhill simplex local optimizationalgorithm were adopted to optimize the structure parameters of the framework. After optimization, thetotal weight of the CFC framework and the TC4 embedded parts is 15.6 kg, accounting for only 18.4%that of the camera. The first order frequency of the camera reaches 104.8 Hz. Finally, a mechanicalenvironment test was performed, and the result demonstrates that the first order frequency of the camerais 102 Hz, which is consistent with the simulation result. It further verifies the rationality and correctnessof the optimization result. The integrated optimization method mentioned in this paper can be applied tothe structure design of other space cameras, which can greatly improve the structure design efficiency.

Integrated Modeling for the Design of Deformable Mirrors Using a Parametric Module Method

Junqing Zhu,Wei Sha,Changzheng Chen,Xingxiang Zhang,Jianyue Ren 한국광학회 2015 Current Optics and Photonics Vol.19 No.5

Active optics is a key technology for future large-aperture space telescopes. In the design of deformablemirrors for space applications, the design parameter trade-off between the number of regularly configuredactuators and the correction capability is essential but rarely analyzed, due to the lack of design legacy. This paper presents a parametric module method for integrated modeling of deformable mirrors withregularly configured actuators. A full design parameter space is explored to evaluate the correctioncapability and the mass of deformable mirrors, using an autoconstructed finite-element parametric modelingmethod that utilizes manual finite-element meshing for complex structures. These results are used to providedesign guidelines for deformable mirrors. The integrated modeling method presented here can be used forfuture applied optics projects