期刊:
Journal of the Korean Physical Society,2022年81(8):739-749 ISSN:0374-4884
通讯作者:
Xue-yu Gong
作者机构:
[Deng, Sheng; Gong, Xue-yu] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Zheng, Ping-wei] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Lu, Xing-qiang] Yantai Univ, Coll Nucl Equipment & Nucl Engn, Yantai 264005, Peoples R China.
通讯机构:
[Xue-yu Gong] S;School of Nuclear Science and Technology, University of South China, Hengyang, China
关键词:
Tokamak plasma;Electron cyclotron current drive;The Ohkawa mechanism;The Fisch–Boozer mechanism
摘要:
The expressions of both the Fisch–Boozer and Ohkawa currents are constructed, and a feasible and efficient calculation method is given. Simulation results of the Fokker–Plank code verify the expressions and the calculation method. We calculate and separate the Ohkawa and Fisch–Boozer currents on a single magnetic flux surface of the off-axis position. The Ohkawa current drive mechanism can be made dominant over the Fisch–Boozer mechanism to achieve a high driven current. This can be done by adjusting the parameters of electron cyclotron waves to make the power deposited in the off-axis region of the low-field side.
期刊:
Frontiers in Chemistry,2022年10:835959 ISSN:2296-2646
通讯作者:
Wu, Xiaoyan;Liu, Y;Wu, XY
作者机构:
[Yu, Shoufu; Li, Mi; Zhang, Qiucai; Lv, Chunxue; Wu, Xiaoyan; Shi, Keyou; Ye, Jian; Zhang, Xiaowen; Liu, Yong; Xie, Wenjie] Univ South China, Hengyang, Peoples R China.;[Li, Mi; Wu, Xiaoyan; Ye, Jian; Zhang, Xiaowen] Univ South China, Hengyang Key Lab Soil Contaminat Control & Remedi, Hengyang, Peoples R China.;[Li, Mi; Wu, Xiaoyan; Ye, Jian; Zhang, Xiaowen] Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang, Peoples R China.;[Zhang, Qiucai; Liu, Yong] Univ South China, Decommissioning Engn Technol Res Ctr Hunan Prov U, Hengyang, Peoples R China.
通讯机构:
[Liu, Y ; Wu, XY; Wu, XY ] U;Univ South China, Hengyang, Peoples R China.;Univ South China, Hengyang Key Lab Soil Contaminat Control & Remedi, Hengyang, Peoples R China.;Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang, Peoples R China.;Univ South China, Decommissioning Engn Technol Res Ctr Hunan Prov U, Hengyang, Peoples R China.
作者机构:
[Qin, Ya-guang] Power China Huadong Engn Corp Ltd, Hangzhou 311122, Peoples R China.;[Gu, De-sheng; Yang, Dong-jie; Qin, Ya-guang; Feng, Chun-di; Ma, Shao-wei; Hu, Jian-hua] Cent South Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China.;[Bai, Xin] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421000, Peoples R China.
关键词:
grain deformation;in situ XCT;failure behavior;Stokes rotation;material line
摘要:
This work aimed to quantify the physical and mechanical behavior of three-dimensional microstructures in rocks under uniaxial compression. A high-precision in situ XCT (X-ray transmission computed tomography) technology was applied to investigating the behavior of mineral grains in sandstone: the movement, the rotation deformation, and the principal strains between fault zone and non-fault zone. The results indicate that after unloading, the shear strain of mineral grains is periodic in the radial direction, the strain of mineral grains in the fracture zone is about 30 times of the macro strain of the specimen, which is about 5 times in the non-fracture zone, and the shear strain near the fault zone is larger than the compressive strain, and there is the shear stress concentration feature.
摘要:
Abstract Quinoline synthesis: A novel gemini sulfonic acidic pyridiniumium ionic liquid immobilized MCM-41 was successfully prepared as a green heterogeneous catalyst, which exhibited high catalytic activity and excellent reusability in quinoline synthesis. Abstract A novel 2,2′-bipyridine-based gemini sulfonic ionic liquid was first synthesized and then immobilized on MCM-41 support (named IL1/MCM-41), which was further characterized using XRD, FT-IR, SEM, TEM, N2-physisorption, XPS and TG techniques. These characterization results revealed that the IL1/MCM-41 presented a whole ordered mesoporous structure, excellent thermal stability as well as the interaction between ionic liquid with MCM-41. Catalytic activity of the obtained IL1/MCM-41 was systematically evaluated for the Doebner-Von Miller reaction to generate quinoline. Compared to conventional imidazole-type single sulfonic ionic liquid supported on MCM-41 (named IL2/MCM-41), IL1/MCM-41 exhibited higher catalytic activity and better reusability, which was probably due to the synergistic catalytic effect of the dual sulfonic acid group on IL2 and the stronger interaction between dipyridine ring of ionic liquid with MCM-41 support, respectively. Meanwhile, a plausible reaction routes for the synergistic catalytic action of dual sulfonic acid to quinoline over the IL1/MCM-41 catalyst was also proposed in this paper.
作者机构:
[Hua, Yilong; Yang, Jianping] Donghua Univ, Coll Mat Sci & Engn, Shanghai 200051, Peoples R China.;[Hua, Yilong; Li, Donghan] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Zhang, Wei-xian; Wang, Wei; Li, Ruofan; Gu, Tianhang] Tongji Univ, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China.;[Zhang, Wei-xian] South China Agr Univ, Guangdong Lab Lingnan Modern Agr, Guangzhou 510642, Peoples R China.
通讯机构:
[Yang, J.] C;[Zhang, W.-X.] S;College of Materials Science and Engineering, China;State Key Laboratory of Pollution Control and Resource Reuse, China
作者机构:
[Shu, Yangzhen; Peng, Guowen] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Xiao, Fangzhu; Cheng, Conghui; Guo, Kexin; Chen, Luoyao; Li, Shanshan] Univ South China, Sch Publ Hlth, Hengyang 421001, Hunan, Peoples R China.;[Xie, Jingxi; Peng, Guowen] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构:
[Guowen Peng; Fangzhu Xiao] S;School of Environmental Protection and Safety Engineering of University of South China, Hunan, Hengyang, 421001, China<&wdkj&>School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, Hunan, China<&wdkj&>School of Public Health, University of South China, Hengyang, 421001, Hunan, China
摘要:
Iron-based materials have attracted much attention in water treatment because of excellent ability to treat pollutants. In this study, self-made iron-carbon micro-electrolysis packing (IMP) was introduced to treat uranium-bearing wastewater (UBW). The effects of the IMP dosage, initial pH of solution and initial U(VI) concentration was investigated. The comparison of material adsorption performance and repeated desorption experiments were also accomplished under the optimum conditions. The mechanism of treating UBW by IMP was revealed by studying the change of IMP's surface properties characterized before and after adsorption by Scanning Electron Microscope (SEM), Energy-Dispersive X-ray Spectroscopy (EDS), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS) and Mossbauer spectra (MS). Research results demonstrated that IMP is suitable for the treatment of UBW with low concentration at acid condition (pH < 5). SEM results indicated that uranium was deposited on the surface of IMP in the form of tidy fine particles. The most important reason for uranium removal was determined as the reduction of soluble U(VI) to insoluble U(IV) by IMP. The advantages of IMP for UBW treatment were verified with rapidity, high efficiency, and durability. Therefore, IMP could be considered as a positive material for uranium removal from UBW.
摘要:
A reassembled HBeta zeolite (HBeta-Ct) was obtained via zeolitic dissolution-recrystallization successive treatment, and characterized by means of XRD, FT-IR, SEM, TEM, N-2 adsorption-desorption as well as NH3-TPD techniques. The characterization results manifested that the HBeta-Ct zeolite possessed more mesopores and less acid than the parent one. Catalyst activities of the parent and reassembled HBeta catalysts were investigated in detail in the vapor-phase Doebner-Von Miller reaction to quinolines. The results demonstrated that the reassembled HBeta zeolite showed enhanced catalyst stability and improved anti-alkylation ability. This is probably due to the existence of mesopores on the catalyst which strengthened the diffusion of bulky products from pore channels in the zeolite. Meanwhile, the decreased acid amount over the catalyst can also retard the alkylation process to generate alkylquinolines as well as the acid-induced polymerization reaction to form coke. Besides, the HBeta-Ct catalyst also exhibited good regenerability in the Doebner-Von Miller reaction.
摘要:
In this paper, the developmental toxicity and apoptosis in zebrafish (Danio rerio) embryos induced by 0.01, 0.05, and 0.10-Gy gamma-ray irradiation were investigated and verified by single cell gel electrophoresis, acridine orange staining, flow cytometry, transmission electron microscopy, digital gene expression sequencing, and Western blot analysis. DNA damage, deformity rates, and apoptosis of zebrafish embryos were found to increase significantly with the increase of irradiation dose, and survival and hatching rates significantly decreased when the irradiation dose exceeds 0.10 and 0.05 Gy, respectively. Exposure to 0.10-Gy gamma-ray irradiation resulted in the swelling of cell mitochondria of zebrafish embryos and changes in their intracellular vacuoles. mRNA and protein expression levels of Shh (sonic hedgehog 19 KDa) and Smo (smoothened 86 KDa) of Hh signaling pathway associated with the development of early embryos significantly increased with the increase of irradiation dose. Expression of the AKT (56 KDa) and PiK3r3 (55 KDa) genes, which are anti-apoptotic and involved with the PI3K/Akt signaling pathway, significantly decreased, while expression of the bada gene, which is pro-apoptotic, significantly increased. The results show that gamma-ray irradiations of 0.01 and 0.05 Gy can induce developmental toxicity and apoptosis in zebrafish embryos via Hh and PI3K/Akt signaling pathways, respectively.
摘要:
This study was intended to determine the variation rules of the radon emanation coefficient in dump-leached uranium tailing sand. A temperature and humidity controllable device for measuring the emanation coefficient was designed. Tailing sand with different grain sizes was selected from uranium tailings in southern China. An orthogonal experimental design was conducted to determine the radon emanation coefficient of the sand under different temperatures, humidities and grain sizes. Experimental results showed that the air temperature, humidity and grain size have significant effects on the emanation coefficient. The variation rules regarding the radon emanation coefficient showed significant reference value.
摘要:
Mining method selection (MMS) is one of the core contents in mining design. As the influencing factors of MMS are in general of ambiguity or uncertainty, MMS can therefore be deemed as a complex fuzzy multi-criteria decision making problem. To resolve this problem, an extended multi-objective optimization by ratio analysis plus the full multiplicative form (MULTIMOORA) approach is studied in this paper. Three major contributions of this study are included. At first, comparative importance is crisp number in most stepwise weight assessment ratio analysis (SWARA) method, while linguistic terms are utilized to determine the criteria weights in the improved SWARA. Then, several Heronian mean (HM) operators related to linguistic neutrosophic numbers (LNNs) are defined to cope with evaluating indicators’ interrelations. Special cases are discussed, and primary properties are proved as well. At last, in combination with improved SWARA and HM operators, a novel decision making method, extended MULTIMOORA approach based on LNNs, is proposed. Applying this new approach to selecting the optimal mining method through an example, the feasibility is indicated. In addition, analyses of the strengths of the presented method are performed in comparison with other existing approaches.