[en] Micromagnetic simulation is performed to study the recording quality of a permalloy (Py) antidot array. A Karlqvist head field is applied to a single bit region to reverse its magnetization. The signal quality is quantified by the reciprocal of noise N^-1 and contrast ratio C_r, The results showed that N^-1 and C_r increase significantly with the increasing of the bit aspect ratio. The value of C_r can also be improved by applying a bias field H_y throughout the film, for films with high aspect ratio. For those with low ratio, H_y causes undesirable switching of the neighbouring bits instead

[en] This article introduces the changes to the Critical groups, Critical exposure pathway, Critical nuclide (Three Keys) in Yangjiang Nuclear Power Plant since its operation in May 2013, they are caused by the changes in ambient population, environment, as well as the actual discharge of radioactive effluent from Yangjiang nuclear power plant. Through the analysis of above factors, it aims to propose new ideas for the ^Three Keys^, peripheral radiation environment and effluent supervision monitoring scheme, and for the existing sampling and monitoring methods of Yangjiang Nuclear Power Plant. (authors)

[en] This paper introduces the environmental radiation monitoring at Yangjiang Nuclear Power Base from 2014 through 2016, including environment air gamma radiation absorbed dose rate, TLD, and the monitoring data of some major radionuclides as well. Then by analysis lessons drawn through practices are summarized. Results show the running of Yangjiang Nuclear Power Base from 2014 through 2016 has no perceptible effects on the environment, and its radioactive environmental quality remains basically at the same level as the background investigated before operation. (authors)

[en] Least squares support vector machine (LS-SVM) for nonlinear regression is sensitive to outliers in the field of machine learning. Weighted LS-SVM (WLS-SVM) overcomes this drawback by adding weight to each training sample. However, as the number of outliers increases, the accuracy of WLS-SVM may decrease. In order to improve the robustness of WLS-SVM, a new robust regression method based on WLS-SVM and penalized trimmed squares (WLSSVM–PTS) has been proposed. The algorithm comprises three main stages. The initial parameters are obtained by least trimmed squares at first. Then, the significant outliers are identified and eliminated by the Fast-PTS algorithm. The remaining samples with little outliers are estimated by WLS-SVM at last. The statistical tests of experimental results carried out on numerical datasets and real-world datasets show that the proposed WLSSVM–PTS is significantly robust than LS-SVM, WLS-SVM and LSSVM–LTS.

[en] The monitoring equipment and operational quality control measures for continuous monitoring of γ air absorption dose rate at Yangjiang Nuclear Power Plant (NPP) Guangdong Province, from 2014 to 2017, are presented. The accuracy of results is ensured by means such as monthly inspection, instrument comparison, and source testing. (authors)

[en] Objective: To investigate the influences for Maitake Polysaccharide on the Immunoregulation and anti-radiating damage. Methods: The mice were divided into control group and three experiment groups. The mice of three experiment groups were fed Maitake Polysaccharide at dose of 0.15 g/kg, 0.30 g/kg, 0.90 g/kg for 30 days. 7 indexes were observed to detect the effect of Maitake Polysaccharide on the immunoregulation. The other mice were divided into radiating control group and three experiment groups. The mice of three experiment groups were fed in the same way. Then all animals were radiated by ⁶⁰Co-γ. The number of white blood cells (WBC) was counted before radiating, on 3 and 14 day after radiating. The DNA content of bone marrow cells were measured on 3 days after radiating. The activities of superoxide dismutase (SOD) in serum were measured on 7 days after radiating. Results: Maitake Polysaccharide could increase the amount of hemolytic antibody in serum. The proliferation of ConA-induced mitogenic response for spleen lymphocyte was also increased. Maitake Polysaccharide could enhance the activity of NK cell and the ability of phagocytosis significantly. Compared with the radiating control group, the number of WBC and the DNA content of bone marrow cells, and the activities of SOD in serum increased significantly. Conclusion: Maitake Polysaccharide can improve cell-mediated and humoral immune function and non-specific immune function, and protect the mice from radiation injuries. (authors)

[en] The operation and maintenance of sub-stations of radiation environment monitoring system at Yangjiang and Taishan NPP, by Guangdong Environmental Radiation Monitoring Center, is presented, Relevant issues are put forward, as well as some suggestions on sub-station siting, construction, upgrading and reconstruction (authors)

[en] To explore how Girdin/GIV is regulated by cyclic tension and propagates downstream signals to affect cell proliferation and migration. Human osteoblast-like MG-63 cells were exposed to cyclic tension force at 4000 μstrain and 0.5 Hz for 6 h, produced by a four-point bending system. Cyclic tension force upregulated Girdin and Akt expression and phosphorylation in cultured MG-63 cells. Girdin and Akt each promoted the phosphorylation of the other under stimulated tension. In vitro MTT and transwell assays showed that Girdin and Akt are required for cell proliferation and migration during cellular quiescence. Moreover, STAT3 was determined to be essential for Girdin expression under stimulated tension force in the physiological condition, as well as for osteoblast proliferation and migration during quiescence. These findings suggest that the STAT3/Girdin/Akt pathway activates in osteoblasts in response to mechanical stimulation and may play a significant role in triggering osteoblast proliferation and migration during orthodontic treatment. - Highlights: • Tension force upregulates Girdin and Akt expression and phosphorylation. • Girdin and Akt promotes the phosphorylation of each other under tension stimulation. • Girdin and Akt are required for MG-63 cell proliferation and migration. • STAT3 is essential for Girdin expression after application of the tension forces

[en] Based on Yangjiang sea area, Chebyshev spectral method was used to calculate the tidal velocities and sea levels, and particle random walk model was adopted to simulate the concentration distribution of radionuclide ³H from liquid effluent of Yangjiang nuclear power plants. The calculated results show that the concentration of radionuclide ³H is smaller than 0.70 Bq/L near Hailing Island in Yangjiang sea area, which is coincident with the measured value 0.97 Bq/L in October 2015. The result indicates that there is no obvious impact on the Yangjiang sea area due to liquid effluent from Yangjiang nuclear power plants. (authors)

[en] Zirconium oxynitrides thin film thermometers were demonstrated to be useful temperature sensors. However, the basic conduction mechanism of zirconium oxynitrides films has been a long-standing issue, which hinders the prediction and optimization of their ultimate performance. In this letter, zirconium oxynitrides films were grown on sapphire substrates by magnetron sputtering and their electric transport mechanism has been systemically investigated. It was found that in high temperatures region (>150 K) the electrical conductivity was dominated by thermal activation for all samples. In the low temperatures range, while Mott variable hopping conduction (VRH) was dominated the transport for films with relatively low resistance, a crossover from Mott VRH conduction to Efros–Shklovskii (ES) VRH was observed for films with relatively high resistance. This low temperature crossover from Mott to ES VRH indicates the presence of a Coulomb gap (~7 meV). These results demonstrate the competing and tunable conduction mechanism in zirconium oxynitrides thin films, which would be helpful for optimizing the performance of zirconium oxynitrides thermometer