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Zhaotao Gao,Dehao Qu,Yanpeng Qu,Weiqiang Wang,Shurui Cui,Hongxiao Guo,Fei Li,Fayu Sun 한국섬유공학회 2022 Fibers and polymers Vol.23 No.3
In this work, a novel jig dyeing apparatus for dyeing polyester with supercritical carbon dioxide was designed andsuccessfully constructed. The built-in dye boxes set inside and guide roller to increase the exposure area of single layer fabricwere the two most attractive features of the equipment. Polyester was dyed at a temperature of 130 oC, the pressure of27 MPa. The colorfastness was analyzed as a function of polyester running speed. Under the condition that the polyester'srunning speed was 4 m/s, the fastness to staining, the fastness to fading, and the fastness to rubbing were rated at a grade of 3-4, 4-5, and 4, respectively. Dyeing properties complied with the expected requirements.
Ye Yuanjian,Zhong Haobo,Huang Shoubin,Lai Weiqiang,Huang Yizhi,Sun Chunhan,Zhang Yanling,Zheng Shaowei 한국조직공학과 재생의학회 2023 조직공학과 재생의학 Vol.20 No.6
BACKGROUND: Implantation of bone marrow mesenchymal stem cells (BMSCs) is a potential alternative for promoting bone defects healing or osseointegration in osteoporosis. However, the reactive oxygen species (ROS) accumulated and excessive inflammation in the osteoporotic microenvironment could weaken the self-replication and multi-directional differentiation of transplanted BMSCs. METHODS: In this study, to improve the hostile microenvironment in osteoporosis, Poloxamer 407 and hyaluronic acid (HA) was crosslinked to synthetize a thermos-responsive and injectable hydrogel to load MnO2 nanoparticles as a protective carrier (MnO2@Pol/HA hydrogel) for delivering BMSCs. RESULTS: The resulting MnO2@Pol/HA hydrogel processed excellent biocompatibility and durable retention time, and can eliminate accumulated ROS effectively, thereby protecting BMSCs from ROS-mediated inhibition of cell viability, including survival, proliferation, and osteogenic differentiation. In osteoporotic bone defects, implanting of this BMSCs incorporated MnO2@Pol/HA hydrogel significantly eliminated ROS level in bone marrow and bone tissue, induced macrophages polarization from M1 to M2 phenotype, decreased the expression of pro-inflammatory cytokines (e.g., TNFa, IL-1b, and IL-6) and osteogenic related factors (e.g., TGF-b and PDGF). CONCLUSION: This hydrogel-based BMSCs protected delivery strategy indicated better bone repair effect than BMSCs delivering or MnO2@Pol/HA hydrogel implantation singly, which providing a potential alternative strategy for enhancing osteoporotic bone defects healing.
Hu, Guang,Hu, Huasi,Yang, Quanzhan,Yu, Bo,Sun, Weiqiang Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.1
The traditional methods for radiation shield design always only focus on either the structure or the components of the shields rather than both of them at the same time, which largely affects the shielding performance of the facilities, so in this paper, a novel method for designing the structure and components of shields simultaneously is put forward to enhance the shielding ability. The method is developed by using the genetic algorithm (GA) and the MCNP software. In the research, six types of shielding materials with different combinations of elements such as polyethylene (PE), lead (Pb) and Boron compounds are applied to the radiation shield design, and the performance of each material is analyzed and compared. Then two typical materials are selected based on the experiment result of the six samples, which are later verified by the Compact Accelerator Neutron Source (CANS) facility. By using this method, the optimal result can be reached rapidly, and since the design progress is semi-automatic for most procedures are completed by computer, the method saves time and improves accuracy.
Development of gradient composite shielding material for shielding neutrons and gamma ray
Guang Hu,Guang Shi,Huasi Hu,Quanzhan Yang,Bo Yu,Weiqiang Sun 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.10
In this study, a gradient material for shielding neutrons and gamma rays was developed, which consists of epoxy resin, boron carbide (B4C), lead (Pb) and a little graphene oxide. It aims light weight and compact, which will be applied on the transportable nuclear reactor. The material is made up of sixteen layers, and the thickness and components of each layer were designed by genetic algorithm (GA) combined with Monte Carlo N Particle Transport (MCNP). In the experiment, the viscosities of the epoxy at different temperatures were tested, and the settlement regularity of Pb particles and B4C particles in the epoxy was simulated by matlab software. The material was manufactured at 25 °C, the Pb C and O elements of which were also tested, and the result was compared with the outcome of the simulation. Finally, the material's shielding performance was simulated by MCNP and compared with the uniformity material's. The result shows that the shielding performance of gradient material is more effective than that of the uniformity material, and the difference is most noticeable when the materials are 30 cm thick.
Measurement of undesirable neutron spectrum in a 120 MeV linac
Yan Yihong,Tan Xinjian,Weng Xiufeng,Zhang Xiaodong,Zhang Zhikai,Sun Weiqiang,Hu Guang,Hu Huasi 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.10
Photoneutron background spectroscopy observations at linac are essential for directing accelerator shielding and subtracting background signals. Therefore, we constructed a Bonner Sphere Spectrometer (BSS) system based on an array of BF3 gas proportional counter tubes. Initially, the response of the BSS system was simulated using the MCNP5 code. Next, the response of the system was calibrated by using neutrons with energies of 2.86 MeV and 14.84 MeV. Then, the system was employed to measure the spectrum of the 241AmeBe neutron source, and the results were unfolded by using the Gravel and EM algorithms. Using the validated system, the undesirable neutron spectrum of the 120 MeV electron linac was finally measured and acquired. In addition, it is demonstrated that the equivalent undesirable neutron dose at a distance of 3.2 m from the linac is 19.7 mSv/h. The results measured by the above methods could provide guidance for linac-related research.