Analysis of signal cable noise currents in nuclear reactors under high neutron flux irradiation

Wu Xiong,Cai Li,Zhang Xiangju,Wu Tingyu,Jiang Jieqiong 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.12

Cables are indispensable in nuclear power plants for transmitting data measured by various types of detectors, such as self-powered neutron detectors (SPNDs). These cables will generate disturbing signals that must be accurately distinguished and eliminated. Given that the cable current is not very significant, previous research has focused on SPND, with little attention paid to cable evaluation and validation. This paper specifically focuses on the quantitative analysis of cables and proposes a theoretical model to predict cable noise. In this model, the reaction characteristics between irradiated neutrons and cables were discussed thoroughly. Based on the Monte Carlo method, a comprehensive simulation approach of neutron sensitivity was introduced and long-term irradiation experiments in a heavy water reactor (HWR) were designed to verify this model. The theoretical results of this method agree quite well with the experimental measurements, proving that the model is reliable and exhibits excellent accuracy. The experimental data also show that the cable current accounts for approximately 0.2% of the total current at the initial moment, but as the detector gradually depletes, it will contribute more than 2%, making it a non-negligible proportion of the total signal current

Dynamic Frequency of Blood CD4+CD25+ Regulatory T Cells in Rats with Collagen-induced Arthritis

Tingyu Wang,Jun Li,Zhigui Jin,Feihua Wu,Yunwu Li,Xiaohua Wang,Hong Zhou,Qian Zhou 대한약리학회 2015 The Korean Journal of Physiology & Pharmacology Vol.19 No.2

CD4+CD25+ regulatory T cells (CD4+CD25+ Tregs) have been shown to play a regulatory orsuppressive role in the immune response and are possibly relevant to the pathogenesis of autoimmunediseases. In the present study, we attempted to investigate the frequency of CD4+CD25+ Tregs inperipheral blood (PB) of collagen-induced arthritis (CIA) rats during the development of arthritis, todetermine whether their frequency is involved in the immunoregulation of this disease. The resultsshowed that normal rats had similar frequencies of CD4+CD25+ Tregs in PB during the experimenttime, expressed as a percentage of CD4+CD25+Foxp3+ T cells among the CD4+ T lymphocyte population. In contrast, the frequency of CD4+CD25+Foxp3+ T cells in CIA rats was found to change duringthe development of arthritis. In CIA rats, there is a significant negative correlation betweenthe frequency of CD4+CD25+Foxp3+ T cells and paw swelling (r=−0.786, p< 0.01). The relationshipbetween the frequency of CD4+CD25+Foxp3+ T and immune activation was not found in normal rats. During the time course, the frequency of CD4+CD25+Foxp3+ T was lower in CIA rats than in normalones. The data suggest that the frequency of PB CD4+CD25+ Tregs may be a promising marker forarthritis activity.

Dynamic Frequency of Blood CD4+CD25+ Regulatory T Cells in Rats with Collagen-induced Arthritis

Wang, Tingyu,Li, Jun,Jin, Zhigui,Wu, Feihua,Li, Yunwu,Wang, Xiaohua,Zhou, Hong,Zhou, Qian The Korean Society of Pharmacology 2015 The Korean Journal of Physiology & Pharmacology Vol.19 No.2

CD4+CD25+ regulatory T cells (CD4+CD25+ Tregs) have been shown to play a regulatory or suppressive role in the immune response and are possibly relevant to the pathogenesis of autoimmune diseases. In the present study, we attempted to investigate the frequency of CD4+CD25+ Tregs in peripheral blood (PB) of collagen-induced arthritis (CIA) rats during the development of arthritis, to determine whether their frequency is involved in the immunoregulation of this disease. The results showed that normal rats had similar frequencies of CD4+CD25+ Tregs in PB during the experiment time, expressed as a percentage of CD4+CD25+Foxp3+ T cells among the CD4+ T lymphocyte population. In contrast, the frequency of CD4+CD25+Foxp3+ T cells in CIA rats was found to change during the development of arthritis. In CIA rats, there is a significant negative correlation between the frequency of CD4+CD25+Foxp3+ T cells and paw swelling (r=-0.786, p< 0.01). The relationship between the frequency of CD4+CD25+Foxp3+ T and immune activation was not found in normal rats. During the time course, the frequency of CD4+CD25+Foxp3+ T was lower in CIA rats than in normal ones. The data suggest that the frequency of PB CD4+CD25+ Tregs may be a promising marker for arthritis activity.

CO2 capture and preparation of spindle-like CaCO3 crystals for papermaking using calcium carbide residue waste via an atomizing approach

Liang Ma,Tingyu Yang,Yu Wu,Xiaoqing Yue,Jinrong Yang,Shuai Zhang,Qiang Li,Jianbin Zhang 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.9

Spindle-like CaCO3 crystals with controllable sizes for papermaking were successfully prepared using CO2 (8% CO2/N2 mixture gas) and calcium carbide residue (CCR) waste, a by-product of acetylene gas and polyvinyl chloride production, as the raw materials by an atomization method at room temperature. The influences of solution concentration, reaction temperature, and gas/liquid flow rate ratios on the properties of the CaCO3 crystal were systematically investigated, and a possible atomization mechanism was proposed. The size of the as-prepared CaCO3 crystal with pure calcite phase was turned from 4.71×4.02 μm to 1.82×1.12 μm by adjusting the reaction conditions. The application of the as-prepared CaCO3 crystals from CCR waste as a filler for papermaking was explored. The R475 blue light whiteness of paper was increased from 77.3 to 80.6 with 11.4% CaCO3 crystals

Study on surface physical and chemical mechanism of nanobubble enhanced flotation of fine graphite

Tang Chongliang,Ma Fangyuan,Wu Tingyu,Zhang Di,Wang Ye,Zhao Tonglin,Fan Zhaolin,Liu Xinyue 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-

It has been concluded in a recently published investigation that the nanobubble flotation process significantlyreduces the number of fine flake graphite flotation stages and improves the flotation performance. The present study was conducted to explore the mechanisms of surface nanobubbles enhancing flake graphiteflotation by investigating effects of nanobubbles on surface properties of graphite and interactionsbetween particles and bubbles by use of contact angle analyzer, zeta potential analyzer, FourierTransform Infrared Spectroscopy (FTIR), and X-ray Photoelectron Spectroscopy (XPS). The study resultsshow that nanobubbles can improve the surface properties of graphite and enhance the adsorption effectof collector, which increased the contact angle of the graphite surface by 11.93 compared with conventionalflotation. Infrared spectroscopy and potential analysis showed that the nanobubbles could enhancethe hydrophobic attraction and reduce the electrostatic repulsion between the collector and the graphitesurface, which was beneficial to enhance the hydrophobic surface of the graphite and enhance theagglomeration of fine graphite particles. XPS analysis showed that the nanobubbles covered polar hydrophilicgroups (such as CAO, C@O, COOH) on the graphite surface, which enhanced the adsorption of collectorto improve the hydrophobicity of graphite surface.

Cyclic Behavior of Sand under Traffic Loading with ‘Inclined’ Consolidation

Lin Guo,Yuan Fang,Tingyu Wu,Jun Wang,Hongxu Jin,Li Shi 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.5

To investigate the vertical strain development of sand under traffic loading after the process of ‘inclined’ consolidation, a series of cyclic drained tests were carried out by using a hollow cylinder apparatus. Three parameters were considered in this paper: initial consolidation angle, vertical cyclic stress ratio and cyclic torsional stress ratio. Test results show that the vertical strain under traffic loading path is larger than that of specimens whose cyclic torsional stress ratio is equal to 0 in the same situation. Furthermore, the vertical stain will decrease with the increase of consolidating inclination in the situation of same values of vertical cyclic stress ratio and cyclic torsional stress ratio. When initial consolidation angle is equal to 0o and 22.5o, the vertical strain will increase with increasing value of cyclic torsional stress ratio, while the effect of cyclic torsional stress ratio on vertical strain will be less significant when initial consolidation angle is equal to 45o. Moreover the trend that vertical strain increases with increasing value of cyclic torsional stress ratio will be more significant for a larger value of vertical cyclic stress ratio.