Microwave-accelerated direct synthesis of 3-picoline from glycerol through a liquid phase reaction pathway
作者：
Luo, Cai-Wu;Feng, Xiao-Yan;Chao, Zi-Sheng*
期刊：
NEW JOURNAL OF CHEMISTRY ,2016年40(10):8863-8871 ISSN：1144-0546
通讯作者：
Chao, Zi-Sheng
作者机构：
[Luo, Cai-Wu; Chao, Zi-Sheng] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.;[Luo, Cai-Wu] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Feng, Xiao-Yan] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chem Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Chao, Zi-Sheng] C;Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.
摘要：
A novel route for the synthesis of 3-picoline from glycerol via liquid phase reaction under mild condition, using microwave irradiation, had been well established. The heating mode had a profound effect on the yield of 3-picoline. The formation of 3-picoline could be promoted significantly by microwave heating, however, only very little amount of 3-picoline was generated by conventional heating under the reaction conditions employed in this study. Influencing factors were systemically investigated on the basis of a HAc-catalyzed under microwave irradiation. Additionally, a lot of heterogeneous catalysts were screened. It was found that as high as a 71% yield of 3-picoline was obtained with the mass ratio of pure glycerol/ammonium acetate/acetic acid/TiO2 = 1/3/10/0.2 at 373 K, after only 20 min of microwave irradiation. A catalyst pair (HAc and TiO2) exhibited better catalytic performance relative to other catalysts in this work. Accordingly, microwave assistance together with the catalysts achieved effective transformation of glycerol to 3-picoline under mild conditions. The related plausible reaction mechanisms were also proposed.
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英文
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Kinetics of Uranium Extraction from Uranium Tailings by Oxidative Leaching
作者：
Zhang, Biao;Li, Mi* ;Zhang, Xiaowen;Huang, Jing
期刊：
JOM ,2016年68(7):1990-2001 ISSN：1047-4838
通讯作者：
Li, Mi
作者机构：
[Zhang, Biao; Li, Mi; Huang, Jing; Zhang, Xiaowen] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Li, Mi; Zhang, Xiaowen] Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang 421001, Peoples R China.
通讯机构：
[Li, Mi] U;Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang 421001, Peoples R China.
关键词：
Uranium;Sulfuric Acid Solution;Uranium Concentration;Uranium Oxide;Shrink Core Model
摘要：
Extraction of uranium from uranium tailings by oxidative leaching with hydrogen peroxide (H<inf>2</inf>O<inf>2</inf>) was studied. The effects of various extraction factors were investigated to optimize the dissolution conditions, as well as to determine the leaching kinetic parameters. The behavior of H<inf>2</inf>O<inf>2</inf>in the leaching process was determined through scanning electron microscopy-energy dispersive x-ray spectroscopy (SEM-EDX) and x-ray diffraction analysis of leaching residues. Results suggest that H<inf>2</inf>O<inf>2</inf>can significantly improve uranium extraction by decomposing the complex gangue structures in uranium tailings and by enhancing the reaction rate between uranium phases and the leaching agent. The extraction kinetics expression was changed from 1 − 3(1 − α)<sup>2/3</sup> + 2(1 − α) = K<inf>0</inf>(H<inf>2</inf>SO<inf>4</inf>)<sup>−0.14903</sup>(S/L)<sup>−1.80435</sup>(R<inf>o</inf>)<sup>0.20023</sup>e<sup>−1670.93/T</sup>t (t ≥ 5) to 1 − 3(1 − α)<sup>2/3</sup> + 2(1 − α) = K<inf>0</inf>(H<inf>2</inf>SO<inf>4</inf>)<sup>0.01382</sup>(S/L)<sup>−1.83275</sup>(R<inf>o</inf>)<sup>0.25763</sup>e<sup>−1654.59/T</sup>t (t ≥ 5) by the addition of H<inf>2</inf>O<inf>2</inf>in the leaching process. The use of H<inf>2</inf>O<inf>2</inf>in uranium leaching may help in extracting uranium more efficiently and rapidly from low-uranium-containing ores or tailings. ©2016, The Minerals, Metals & Materials Society.
语种：
英文
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Application of a combination of municipal solid waste incineration fly ash and lightweight aggregate in concrete
作者：
Tan, Wen-fa* ;Lv, Jun-wen;Deng, Qin-wen;Zhang, Xiao-wen
期刊：
Journal of Adhesion Science and Technology ,2016年30(8):866-877 ISSN：0169-4243
通讯作者：
Tan, Wen-fa
作者机构：
[Tan, Wen-fa; Zhang, Xiao-wen; Lv, Jun-wen; Deng, Qin-wen] Univ South China, Dept Environm Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Tan, Wen-fa] U;Univ South China, Dept Environm Engn, Hengyang 421001, Peoples R China.
关键词：
Fly ash;hazardous waste;lightweight aggregate;concrete
摘要：
This paper highlights significant findings from focusing on developing a sustainable lightweight aggregate (LWA) concrete, which replaced Portland cement partially with municipal solid waste incineration fly ash (MSWI FA) and all of the conventional coarse aggregate with LWA sintered by MSWI FA, shale, and sludge. A series of four experiments, differing in dosage of MSWI FA and aggregate, were conducted for this project. The results of this study generally showed that appropriate amount of MSWI FA substitution for cement has no significantly lowered the compressive strengths of LWA concrete, while it can lower the oven-dry density and the thermal conductivity. The optimum performance of LWA concrete (after 28 days of curing) is as follows: (1) slump flow of 700 mm, (2) compressive strength of 30.14 MPa, (3) dry apparent density of 1.66 g/cm3, (4) thermal conductivity of 0.73 W (m K)−1; the mixture ratio of LWA, fly ash, cement, and fine sand is 3.0: 0.1: 0.9: 2.0 based on dry weight. Meanwhile, the results of leaching test are much lower than the concentration limits of hazardous constituents of hazardous waste identification standard (GB/T 5083.3-2007) and landfill standard (GB16889-2008).
语种：
英文
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Current drive with combined electron cyclotron wave and high harmonic fast wave in tokamak plasmas
作者：
Li, J. C.;Gong, X. Y.* ;Dong, J. Q.;Wang, J.;Zhang, N.;...
期刊：
PHYSICS OF PLASMAS ,2016年23(12):122504 ISSN：1070-664X
通讯作者：
Gong, X. Y.
作者机构：
[Yin, C. Y.; Li, J. C.; Gong, X. Y.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Li, J. C.] Peking Univ, Dept Phys, FSC, Beijing 100871, Peoples R China.;[Li, J. C.] Peking Univ, State Key Lab Nucl Phys & Technol, FSC, Beijing 100871, Peoples R China.;[Zhang, N.; Dong, J. Q.; Wang, J.] Southwestern Inst Phys, POB 432, Chengdu 610041, Peoples R China.;[Dong, J. Q.] Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310058, Zhejiang, Peoples R China.
通讯机构：
[Gong, X. Y.] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
关键词：
plasma density;plasma hybrid waves;plasma simulation;plasma toroidal confinement;refractive index;Tokamak devices
摘要：
The current driven by combined electron cyclotron wave (ECW) and high harmonic fast wave is investigated using the GENRAY/CQL3D package. It is shown that no significant synergetic current is found in a range of cases with a combined ECW and fast wave (FW). This result is consistent with a previous study [Harvey et al., in Proceedings of IAEA TCM on Fast Wave Current Drive in Reactor Scale Tokamaks (Synergy and Complimentarily with LHCD and ECRH), Arles, France, IAEA, Vienna, 1991]. However, a positive synergy effect does appear with the FW in the lower hybrid range of frequencies. This positive synergy effect can be explained using a picture of the electron distribution function induced by the ECW and a very high harmonic fast wave (helicon). The dependence of the synergy effect on the radial position of the power deposition, the wave power, the wave frequency, and the parallel refractive index is also analyzed, both numerically and physically.
语种：
英文
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Environmental effects of coal gangue and its utilization
作者：
Tan, W-F.;Wang, L-A.* ;Huang, C.
期刊：
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS ,2016年38(24):3716-3721 ISSN：1556-7036
通讯作者：
Wang, L-A.
作者机构：
[Tan, W-F.] Univ South China, Dept Environm Engn, Hengyang, Peoples R China.;[Huang, C.; Tan, W-F.; Wang, L-A.] Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing, Peoples R China.;[Wang, L-A.] Chongqing Univ, Sch Resources & Environm Sci, 174 Shazhengjie, Chongqing 400044, Peoples R China.
通讯机构：
[Wang, L-A.] C;Chongqing Univ, Sch Resources & Environm Sci, 174 Shazhengjie, Chongqing 400044, Peoples R China.
关键词：
Coal gangue;environmental effects;utilization;lightweight aggregates;natural resources
摘要：
Coal gangue has accumulated huge coal gangue piles, occupying lots of land as well as having striking influence on the neighboring environmental effects. This paper seeks a new way of coal gangue treatment in which the coal gangue blended with shale and sludge was sintered in rotary kiln to form lightweight aggregates. The results show that the optimum mixture ratio of coal gangue, shale, and sludge is 50, 40, and 10 wt% and the corresponding indicators of aggregates obtained are: (a) bulk density of 658 kg/m<sup>3</sup>, (b) granule strength of 643N, (c) 1 h absorption water to be 13.8%. ©2016 Taylor & Francis.
语种：
英文
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Deactivation and regeneration on the ZSM-5-based catalyst for the synthesis of pyridine and 3-picoline
作者：
Luo, Cai-Wu;Feng, Xiao-Yan;Liu, Wei;Lia, Xiang-Yang;Chao, Zi-Sheng*
期刊：
Microporous and Mesoporous Materials ,2016年235:261-269 ISSN：1387-1811
通讯作者：
Chao, Zi-Sheng
作者机构：
[Luo, Cai-Wu; Lia, Xiang-Yang] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Luo, Cai-Wu; Chao, Zi-Sheng; Feng, Xiao-Yan] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chem Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;[Liu, Wei] Georgia Inst Technol, Sch Chem & Biomol Engn, 500 10th St NW, Atlanta, GA 30332 USA.;[Liu, Wei] Georgia Inst Technol, RBI Georgia Tech, 500 10th St NW, Atlanta, GA 30332 USA.
通讯机构：
[Chao, Zi-Sheng] H;Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chem Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.
关键词：
ZSM-5;Deactivation;Regeneration;Residual coke;Dealumination
摘要：
The deactivation and regeneration of the ZSM-5-based catalyst was investigated in the reaction of acrolein diethyl acetal and ammonia toward pyridine and 3-picoline. The coke was the main reason leading to deactivation for all the tested catalysts, and it was basically combusted at high temperature under the air and water streams in order to recover the initial catalytic performance. The best catalyst through the reaction-regeneration treatment could effectively promote the formation of pyridine and 3-picoline. The results showed that the total yield of pyridine and 3-picoline was raised above 20% while the reaction was operated the 10th reaction-regeneration cycle relative to the 1st reaction at TOS (time on stream) = 1–3 h. The catalysts were characterized by means of XRD, N<inf>2</inf>-physisorption, FT-IR and NH<inf>3</inf>-TPD techniques. By relating the performance and structure of the catalyst, it was found that the dealumination and the residual coke were responsible for boosting the catalytic activity after several reaction-regeneration cycles. The dealumination generated more mesopores and less acidity while the residual coke resulted in lowering the acidity. The relationship between the catalyst and the regeneration was well established. ©2016 Elsevier Inc.
语种：
英文
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Effects of feldspar and salinity on the mineral sequestration capacity of CO2 in high-salinity aquifers
作者：
Fang, Qi* ;Li, Yilian;Peng, Guojian;Cheng, Peng;Lv, Junwen
期刊：
Environmental Earth Sciences ,2016年75(18):1-13 ISSN：1866-6280
通讯作者：
Fang, Qi
作者机构：
[Fang, Qi; Lv, Junwen] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Li, Yilian] China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China.;[Peng, Guojian] Univ South China, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.;[Cheng, Peng] Team 217 Hunan Nonferrous Geol Explorat Bur, Hengyang 421001, Peoples R China.
通讯机构：
[Fang, Qi] U;Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.
关键词：
CO2 geological storage;Mineral sequestration capacity;Feldspar;Salinity;High-salinity aquifers
摘要：
Mineral sequestration of CO2 is considered to be the safest mechanism in the long-term storage of CO2 in deep saline aquifers. This study aims to investigate the effect of feldspar and salinity on the mineral sequestration capacity of CO2 in deep high-salinity brine aquifers by taking Jiangling Depression of Jianghan Basin for instance. Numerical simulation on the long-term geochemical reaction and transport was performed by taking TOUGHREACT as the simulation tool. Simulation results indicate that the effect of feldspar on the mineral trapping capacity of CO2 does not depend on the total content of feldspar, but depends on feldspar type and relative content. With Mg-rich minerals such as chlorite or dolomite present, the mineral composition abundant in K-feldspar is less favorable for the mineral sequestration capacity of CO2 for the reason that a large amount of illite precipitates, consuming a lot of Al3+ in the aqueous solution, thereby limiting the precipitation of dawsonite, especially for the high-temperature sedimentary environment. In addition, the effect of salinity on the mineral sequestration capacity of CO2 represents two aspects: one for the longer migration distance due to the lower solubility of higher salinity and the other for CO2 mineral trapping capacity per 1m3 medium which is not in simple decreased with salinity, depending on K-feldspar present or not. For the mineral composition with K-feldspar present, CO2 mineral trapping capacity decreases with salinity, while with albite instead of K-feldspar, it increases with salinity owing to more precipitation of dawsonite. © 2016, Springer-Verlag Berlin Heidelberg.
语种：
英文
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Investigation of gamma ray shielding efficiency and mechanical performances of concrete shields containing bismuth oxide as an environmentally friendly additive
作者：
Yao, Ya;Zhang, Xiaowen* ;Li, Mi;Yang, Rong;Jiang, Tianjiao;...
期刊：
Radiation Physics and Chemistry ,2016年127:188-193 ISSN：0969-806X
通讯作者：
Zhang, Xiaowen
作者机构：
[Yao, Ya; Yang, Rong; Jiang, Tianjiao] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 42100, Peoples R China.;[Li, Mi; Lv, Junwen; Zhang, Xiaowen] Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Zhang, Xiaowen] U;Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang 421001, Hunan, Peoples R China.
关键词：
Bismuth oxide;Compressive strength;Concrete;Lead oxide;Linear attenuation coefficient
摘要：
Concrete has a proven ability to attenuate gamma rays and neutrons without compromising structural property;therefore, it is widely used as the primary shielding material in many nuclear facilities. Recently, there is a tendency toward using various additives to enhance the shielding properties of these concrete mixtures. However, most of these additives being used either pose hygiene hazards or require special handling processes. It would be ideal if environmentally friendly additives were available for use. The bismuth oxide (Bi<inf>2</inf>O<inf>3</inf>) additive shows promise in various shielding applications due to its proven radiation attenuation ability and environmentally friendly nature. To the best of our knowledge, however, Bi<inf>2</inf>O<inf>3</inf>has never been used in concrete mixtures. Therefore, for this research, we fabricated the Bi<inf>2</inf>O<inf>3</inf>-based concrete mixtures by adding Bi<inf>2</inf>O<inf>3</inf>powder in the ordinary concrete mixture. Concrete mixtures with lead oxide (PbO) additives were used for comparison. Radiation shielding parameters like the linear attenuation coefficients (LAC) of all these concrete mixtures showing the effects of the Bi<inf>2</inf>O<inf>3</inf>additions are presented. The mechanical performances of concrete mixtures incorporated with Bi<inf>2</inf>O<inf>3</inf>additive were also investigated. It suggested that the concrete mixture containing 25% Bi<inf>2</inf>O<inf>3</inf>powder (B5 in this study) provided the best shielding capacity and mechanical performance among other mixes. It has a significant potential for application as a structural concrete where radiological protection capability is required. ©2016 Elsevier Ltd
语种：
英文
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Modeling and experimental examination of water level effects on radon exhalation from fragmented uranium ore
作者：
Ye, Yong-jun* ;Dai, Xin-tao;Ding, De-xin;Zhao, Ya-li
期刊：
Journal of Environmental Radioactivity ,2016年165:219-226 ISSN：0265-931X
通讯作者：
Ye, Yong-jun
作者机构：
[Ye, Yong-jun; Ding, De-xin] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.;[Dai, Xin-tao; Ye, Yong-jun; Zhao, Ya-li] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Ye, Yong-jun] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
关键词：
Model;Fragmented uranium ore;Water level;Radon concentration;Radon exhalation rate
摘要：
In this study, a one-dimensional steady-state mathematical model of radon transport in fragmented uranium ore was established according to Fick's law and radon transfer theory in an air-water interface. The model was utilized to obtain an analytical solution for radon concentration in the air-water, two-phase system under steady state conditions, as well as a corresponding radon exhalation rate calculation formula. We also designed a one-dimensional experimental apparatus for simulating radon diffusion migration in the uranium ore with various water levels to verify the mathematical model. The predicted results were in close agreement with the measured results, suggesting that the proposed model can be readily used to determine radon concentrations and exhalation rates in fragmented uranium ore with varying water levels.
语种：
英文
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Co-combustion Kinetics Parameters of MSWI Fly Ash with Sawdust and Shale under Different Heating Rates and Atmospheres
作者：
Tan, W. -F.;Wang, L. -A.* ;Huang, C.;Li, J. -X.;Yang, W.
期刊：
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS ,2015年37(22):2415-2421 ISSN：1556-7036
通讯作者：
Wang, L. -A.
作者机构：
[Tan, W. -F.] Univ South China, Dept Environm Engn, Hengyang, Peoples R China.;[Li, J. -X.; Wang, L. -A.; Huang, C.; Yang, W.] Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China.;[Wang, L. -A.] Chongqing Univ, Sch Resources & Environm Sci, 174 Shazhengjie, Chongqing 400044, Peoples R China.
通讯机构：
[Wang, L. -A.] C;Chongqing Univ, Sch Resources & Environm Sci, 174 Shazhengjie, Chongqing 400044, Peoples R China.
关键词：
co-combustion;lightweight aggregates;municipal solid waste incineration fly ash;sawdust;shale;thermogravimetry-differential thermogravimetry-differential scanning calorimetry analysis
摘要：
The kinetic parameters for the co-combustion of municipal solid waste incineration fly ash, sawdust, and shale have been determined by a sync analyzer, aiming to simulate the manufacture of lightweight aggregates process. Experiments were carried out with about each 10-mg samples at different heating rates in air and argon atmospheres, respectively. The results indicate that behaviors of the mixture can be broadly divided into four separate events. The total mass loss reached the maximum at 20 K·min<sup>-1</sup>. There appears to be no unanimous formula of the degree of the total mass loss in different gas atmospheres. ©Copyright ©Taylor & Francis Group, LLC.
语种：
英文
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Numerical studies of electron cyclotron wave current drive on HL-2A tokamak
作者：
Li, J. C.* ;Gong, X. Y.;Dong, J. Q.;Zheng, P. W.;Song, S. D.;...
期刊：
PHYSICS OF PLASMAS ,2015年22(6):062512 ISSN：1070-664X
通讯作者：
Li, J. C.
作者机构：
[Li, J. C.; Gong, X. Y.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Gao, Q. D.; Song, S. D.; Dong, J. Q.] Southwestern Inst Phys, Chengdu 610041, Peoples R China.;[Zheng, P. W.] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Du, D.] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Li, J. C.] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
关键词：
Fokker-Planck equation;numerical analysis;plasma density;plasma radiofrequency heating;plasma simulation;plasma temperature;plasma toroidal confinement;ray tracing;Tokamak devices
摘要：
The electron cyclotron wave (ECW) current drive (CD) for the HL-2A tokamak is investigated numerically with a new ray-tracing and Fokker-Planck code. The code is benchmarked with other well-tested linear and quasilinear codes and is then used to study the electron cyclotron current drive on the HL-2A tokamak. The wave propagation, power deposition, and driven-current profiles are presented. The effect of electron trapping is also assessed. It is found that quasilinear effects are negligible at the present ECW power levels and that when both waves are injected at an angle of 20° on the plasma equatorial plane, the CD efficiency for the HL-2A saturates at ∼0.029 × 1020 A/W/m2 and ∼0.020 × 1020 A/W/m2 for the 0.5 MW/68 GHz first harmonic ordinary (O1) and 1 MW/140 GHz second harmonic extraordinary (X2) modes, respectively. The effects of the plasma density, temperature, and wave-launching position on the driven current are also investigated analytically and numerically.
语种：
英文
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Chromatographic characteristics of water-soluble vitamins with irradiation processing and its application
作者：
Li, Ying;Lv, Changyin* ;Sun, Qiang;Zhao, Ying;Li, Yunjing
期刊：
ANALYTICAL METHODS ,2015年7(1):155-160 ISSN：1759-9660
通讯作者：
Lv, Changyin
作者机构：
[Li, Ying] Ctr Dis Prevent & Control, Inst Sanit Inspect, Dept Phys & Chem Inspect, Xuzhou, Jiangsu, Peoples R China.;[Li, Ying; Lv, Changyin; Li, Yunjing; Sun, Qiang; Zhao, Ying] Univ South China, Inst Environm & Radiat Med, Sch Publ Hlth, Hengyang 421001, Hunan, Peoples R China.;[Lv, Changyin] Univ South China, Inst Environm & Radiat Med, Sch Publ Hlth, Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Lv, Changyin] U;Univ South China, Inst Environm & Radiat Med, Sch Publ Hlth, Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.
摘要：
This study investigated the chromatographic characteristics of irradiated vitamins and their feasibility for dose measurement by using high performance liquid chromatography (HPLC). Water-soluble vitamins in the B family, including thiamine hydrochloride (TH), riboflavin (RF) and nicotinic acid (NA), were used for comparative study. The results showed that riboflavin was sensitive to irradiation, and the content changes of RF were linearly correlated with irradiation doses. Combining the analyses of ultraviolet and fluorescence spectra, the suitable application range for dose determination was confirmed from 100 to 2000 Gy; moreover, the influencing factors were further discussed. The content of RF could maintain good stability before and after irradiation under low-light conditions. These characteristics make it possible for RF to be used as a material for dose measurement. In addition, this work also provides references for irradiation nutrition research due to the favourable separation and analysis characteristics of HPLC. © 2014 The Royal Society of Chemistry.
语种：
英文
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Fully implicit iterative solving method for the fokker-planck equation in tokamak plasmas
作者：
Zheng Pingwei;Gong Xueyu* ;Yu Jun;Du Dan
期刊：
等离子体科学与技术：英文版 ,2014年16(11):1000-1006 ISSN：1009-0630
通讯作者：
Gong Xueyu
作者机构：
[Zheng Pingwei] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Gong Xueyu] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Yu Jun; Gong Xueyu; Du Dan] Univ South China, Dept Math & Phys, Hengyang 421001, Peoples R China.
通讯机构：
[Gong Xueyu] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
tokamak plasmas;Fokker-Planck equation;current drive;benchmark
摘要：
A three dimensional bounce-averaged Fokker-Planck (FP) numerical code has been newly developed based on fully implicit iterative solving method, and relativistic effect is also included in the code. The code has been tested against various benchmark cases: Ohmic conductivity in the presence of weak Ohmic electric field, runaway losses of electrons in the presence of strong Ohmic electric field, lower hybrid current drive and electron cyclotron current drive via two- or three-dimensional simulation. All the test cases run fast and correctly during calculations. As a result, the code provides a set of powerful tools for studying radio frequency wave heating and current drive in tokamak plasmas.
语种：
英文
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Inverse method for determining radon diffusion coefficient and free radon production rate of fragmented uranium ore
作者：
Ye, Yong-jun;Wang, Li-heng;Ding, De-xin* ;Zhao, Ya-li;Fan, Nan-bin
期刊：
Radiation Measurements ,2014年68:1-6 ISSN：1350-4487
通讯作者：
Ding, De-xin
作者机构：
[Ye, Yong-jun; Ding, De-xin] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.;[Ye, Yong-jun; Fan, Nan-bin; Wang, Li-heng; Zhao, Ya-li] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Ding, De-xin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
关键词：
Radon;Diffusion coefficient;Production rate;Fragmented uranium ore;Numerical inverse method
摘要：
The radon diffusion coefficient and the free radon production rate are important parameters for describing radon migration in the fragmented uranium ore. In order to determine the two parameters, the pure diffusion migration equation for radon was firstly established and its analytic solution with the two parameters to be determined was derived. Then, a self manufactured experimental column was used to simulate the pure diffusion of the radon, the improved scintillation cell method was used to measure the pore radon concentrations at different depths of the column loaded with the fragmented uranium ore, and the nonlinear least square algorithm was used to inversely determine the radon diffusion coefficient and the free radon production rate. Finally, the solution with the two inversely determined parameters was used to predict the pore radon concentrations at some depths of the column, and the predicted results were compared with the measured results. The results show that the predicted results are in good agreement with the measured results and the numerical inverse method is applicable to the determination of the radon diffusion coefficient and the free radon production rate for the fragmented uranium ore. ©2014 Elsevier Ltd. All rights reserved.
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A new method for determining the absorbed dose in a radiation field by using a thiamine hydrochloride aqueous solution
作者：
Li, Ying;Lv, Changyin* ;Zhao, Ying;Sun, Qiang;Li, Yunjing
期刊：
Analytical Sciences ,2013年29(12):1189-1194 ISSN：0910-6340
通讯作者：
Lv, Changyin
作者机构：
[Li, Ying; Lv, Changyin; Li, Yunjing; Sun, Qiang; Zhao, Ying] Univ South China, Inst Environm & Radiat Med, Sch Publ Hlth, Hengyang 421001, Hunan, Peoples R China.;[Lv, Changyin] Univ South China, Inst Environm & Radiat Med, Sch Publ Hlth, Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Lv, Changyin] U;Univ South China, Inst Environm & Radiat Med, Sch Publ Hlth, Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.
关键词：
Thiamine hydrochloride;radiation dosimeter;high-performance liquid chromatography (HPLC);mass spectrum;1H-NMR spectrum
摘要：
This research investigated the ionizing radiation effect on thiamine hydrochloride (TH) and its usability as an irradiation dosimeter. The fundamental principle is to determine the concentration variations of TH solutions with high-performance liquid chromatography (HPLC) after exposing to γ-rays. The decreasing peak area of TH in the HPLC chromatogram forms a linear relationship with the rising radiation dose. We investigated the characteristics and suitable application range of the TH as a new radiation dosimeter. The influence factors and mechanism of the reaction induced by radiation were also discussed. According to the correlation between the concentration and the radiation dose, 0.3 g/L of a TH solution is suitable for the 0.1 - 10 kGy dose range, and 2 g/L is appropriate for 0.1 - 20 kGy. The easy availability and the simple, but stable, chemical structure of thiamine makes it a potential candidate for radiation dose research. Also, the preparation proceeding for sampling is easy, and the result can be automatic monitored by liquid chromatography. ©The Japan Society for Analytical Chemistry.
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Photoelectrochemical degradation of azo dye over pulsed laser deposited nitrogen-doped TiO2 thin film
作者：
Peng, Yen-Ping;Yassitepe, Emre;Yeh, Yun-Ta;Ruzybayev, Inci;Shah, S. Ismat;...
期刊：
Applied Catalysis B: Environmental ,2012年125:465-472 ISSN：0926-3373
通讯作者：
Huang, C. P.
作者机构：
[Peng, Yen-Ping] S China Univ, Coll Environm Sci & Engn, Guangzhou 510006, Peoples R China.;[Huang, C. P.; Yeh, Yun-Ta] Univ Delaware, Dept Civil & Environm Engn, Newark, DE 19716 USA.;[Yassitepe, Emre; Shah, S. Ismat] Univ Delaware, Dept Mat Sci Engn, Newark, DE 19716 USA.;[Shah, S. Ismat; Ruzybayev, Inci] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA.
通讯机构：
[Huang, C. P.] U;Univ Delaware, Dept Civil & Environm Engn, Newark, DE 19716 USA.
关键词：
N-doped TiO 2;Photoelectrochemical;Pulsed laser deposition;Synergetic effect;Thin film
摘要：
We investigated the synergetic effect of electrochemical and photocatalytic oxidation in photoelectrochemical (PEC) process for the degradation of hazardous organic compounds exemplified by methyl orange, an azo dye. Nitrogen doped TiO 2 thin film (NTTF) synthesized by the pulsed laser deposition (PLD) method, was used as the working anode. The crystalline, optical properties, surface morphology, and structure of the NTTF were characterized by XRD, UV-vis absorbance edges, SEM, and XPS. Results showed that the NTTF was dominated by anatase phase after sintered at 600°C with significant visible light response at 595nm. XPS analyses indicated nitrogen doping was mainly responsible for reducing the band gap as evidence of 3% N doping into the structure via the linkage of TiON and NTiO bond. SEM images illustrated the nitrogen-doped TiO 2 nanoparticles being attached firmly and spread evenly over the ITO glass surface, which is beneficial for PEC applications. The degradation efficiency of MO by photoelectrochemical, photocatalytic, electrochemical and photolysis methods were compared in terms of pseudo-first-order reaction rate. PEC was the most efficient in degrading MO at a bias potential of 2.0V (vs. SCE) under light at a wavelength of 325nm, which was consistent with results of IPCE (%) measurements. The synergetic effect was quantified at current/bias potential of 0.07mA/0.3V and 0.6mA/2.0V, respectively. Results demonstrated that the bias potential could separate photogenerated holes and electrons effectively and enhance the electrochemical-oxidation of MO. The mechanistic aspects of MO degradation by the PEC process were discussed. © 2012.
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Theoretical analysis of the ICRH antenna's impedance matching for ELMy plasmas on EAST
作者：
Du, Dan* ;Gong, Xueyu;Wang, Zhenhua;Yu, Jun;Zheng, Pingwei
期刊：
Journal of Plasma Physics ,2012年78(6):595-599 ISSN：0022-3778
通讯作者：
Du, Dan
作者机构：
[Du, Dan; Yu, Jun] Univ S China, Dept Math & Phys, Hengyang City, Hunan, Peoples R China.;[Wang, Zhenhua; Gong, Xueyu] Univ S China, Dept Nucl Sci & Technol, Hengyang City, Hunan, Peoples R China.;[Zheng, Pingwei] Univ S China, Dept Environm Protect & Safety Engn, Hengyang City, Hunan, Peoples R China.
通讯机构：
[Du, Dan] U;Univ S China, Dept Math & Phys, Hengyang City, Hunan, Peoples R China.
摘要：
A well-optimized design of an ion cyclotron resonance heating (ICRH) antenna is very important for steady-state plasma heating with high radio frequency (RF) power of several tens of megawatts. However, a sharp decrease in the coupling RF power because of impedance mismatch of ICRH system is an issue that must be resolved for present-day fusion reactors and International Thermonuclear Experimental Reactor. This paper has theoretically analyzed the ICRH antenna's impedance matching for ELMy plasmas on experimental advanced superconducting tokamak (EAST) by the transmission line theory. The results indicate that judicious choice of the optimal feeder location is found useful for adjustable capacitors' tolerance to the variations of the antenna input impedance during edge-localized mode (ELM) discharge, which is expected to be good for the design of ICRH antenna system and for real-time feedback control during ELM discharge on EAST.
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6-Phenyl-6,7-dihydro-dibenzo[c,f][1,5]aza-bis-mocin-12(5H)-yl perchlorate
作者：
Zhang, Xiao-Wen* ;Fan, Ting
期刊：
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2011年67(7):M875-U578 ISSN：2053-2296
通讯作者：
Zhang, Xiao-Wen
作者机构：
[Zhang, Xiao-Wen] Univ S China, Coll Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Fan, Ting] Univ S China, Key Lab Pollut Control & Resource Use Hunan Prov, Hengyang 421001, Peoples R China.
通讯机构：
[Zhang, Xiao-Wen] U;Univ S China, Coll Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.
摘要：
In the title compound, [Bi(C 20H 17N)(ClO 4)] or C 20H 17BiClNO 4, the Bi III ion assumes a distorted trigonal-bipyramidal geometry, with two C atoms and the electron lone pair of the Bi atom at the equatorial positions and an amine N atom and a perchlorate O atom at the apical positions. Weak inter-molecular C - H⋯O hydrogen bonding is present in the crystal structure. © Zhang and Fan 2011.
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