铀矿冶低剂量γ射线辐照对淋巴细胞凋亡的影响
作者：
丁德馨;程新洁;胡南;殷杰
期刊：
南华大学学报(自然科学版) ,2020年34(06):1-5 ISSN：1673-0062
作者机构：
南华大学 资源环境与安全工程学院,湖南 衡阳421001;铀矿冶生物技术国防重点学科实验室,湖南 衡阳421001;[胡南; 程新洁; 殷杰; 丁德馨] 南华大学
关键词：
铀矿冶低剂量γ辐射;淋巴细胞;细胞凋亡;全转录组测序
摘要：
淋巴细胞凋亡在其发育中起着重要的作用,淋巴细胞凋亡率升高可能会引起免疫缺陷,抑制淋巴细胞凋亡率可能会促进淋巴瘤的发展。铀矿冶低剂量γ射线辐照会诱导淋巴细胞的凋亡,流式细胞术检测结果表明,淋巴细胞在接受剂量率为14μGy/h的低剂量率γ射线辐照的21 d内凋亡率逐渐增高,并基本呈线性增加趋势。全转录组测序结果表明,低剂量γ射线辐照后,淋巴细胞内共有1 677个表达差异显著（任意两组间p值<0.05）的基因,主要与细胞对压力的反应、细胞周期、DNA构象变化、DNA修复、细胞蛋白分解代谢过程、病毒致癌机理、染色体分离、p53的转录调控相关。低剂量γ辐射会激活肿瘤抑制蛋白p53,最终使细胞凋亡率升高。
语种：
中文
展开
Experiment on microbial grouting reinforcement of tailings under the regulation of egg white
作者：
Zheng, Huai-miao;Wu, Ling-ling;Tong, Kai-wen;Ding, De-xin;Zhang, Zhi-jun* ;...
期刊：
Soils and Foundations ,2020年60(4):962-977 ISSN：0038-0806
通讯作者：
Zhang, Zhi-jun
作者机构：
[Zheng, Huai-miao; Yu, Qing; Zhang, Zhi-jun; Wu, Ling-ling; He, Gui-cheng; Ding, De-xin] Univ South China, Sch Resource & Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Zheng, Huai-miao; Yu, Qing; Zhang, Zhi-jun; Wu, Ling-ling; He, Gui-cheng; Ding, De-xin] Hunan Prov & Hengyang City Engn Technol Res Ctr D, Hengyang 421001, Peoples R China.;[Zheng, Huai-miao; Yu, Qing; Zhang, Zhi-jun; Wu, Ling-ling; He, Gui-cheng] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Tong, Kai-wen] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
通讯机构：
[Zhang, Zhi-jun] U;Univ South China, Sch Resource & Environm & Safety Engn, Hengyang 421001, Peoples R China.
关键词：
Tailings sand;MICP;Organic substrate;Calcium carbonate;Shear strength
摘要：
Microbial Induced Calcium Carbonate Precipitation (MICP) has some disadvantages, such as low crystallization conversion rate of calcium carbonate and insufficient strength properties of tailings. In this paper, a modified method combining soft template calcium carbonate mineralization technology with microbial grouting reinforcement technology was proposed. The tailings solidification was studied with the control of nine different concentrations of egg white (0%, 5%, 10%, 15%, 20%, 30%, 40%, 60% and 80%). After 14 days of grouting reinforcement experiment, the results are as follows. ① The shear strength of tailings was improved remarkably, and the best reinforcement effect was at 5% egg white. Compared with the control group, the effective cohesion of tailings increased by 437.61%. ② The fitting curve between the content of calcium carbonate in tailings and its cohesion shows that there is an exponential relationship between them. ③ The results of microscopic examination showed that the proportion of columbite-type calcium carbonate increased with the increase of egg white concentration. The corresponding egg white concentration of calcite-type calcium carbonate was 5%. At this time, the maximum particle size could reach 100 µm. ④ The infrared absorption characteristic curves of the interporous cements of tailings indicate that the changes of crystal form, crystal morphology and particle size of calcium carbonate may be due to the strong interaction between polar groups such as N[sbnd]H, C[sbnd]H and C[dbnd]O in the composition of egg white and calcium carbonate crystal. ⑤ The bonding, connecting and packaging of fibers in egg white will cause fundamental changes in the bonding mode of tailings. The test results showed that the combination of mineralization regulation of egg white and MICP technology can achieve complementary advantages, which is of great engineering significance for improving the stability and safety of tailings dam. © 2020
语种：
英文
展开
经口罩过滤后的铀矿尘颗粒物呼吸暴露剂量评价
作者：
叶勇军;吴文浩;李志;尹安松;丁德馨
期刊：
辐射防护 ,2019年39(1):13-18 ISSN：1000-8187
作者机构：
南华大学资源环境与安全工程学院,湖南衡阳421001;南华大学铀矿冶生物技术国防重点学科实验室,湖南衡阳421001;南华大学资源环境与安全工程学院,湖南衡阳,421001;南华大学铀矿冶生物技术国防重点学科实验室,湖南衡阳,421001;[尹安松; 丁德馨; 李志; 叶勇军; 吴文浩] 南华大学
关键词：
铀矿尘;呼吸暴露剂量;风险评价;口罩;铀矿
摘要：
铀矿尘中含有大量的长寿命α放射性核素,其对铀矿井下工人内照射剂量具有不容忽视的贡献。为研究经两种常用口罩过滤后的铀矿尘颗粒物的呼吸暴露风险,本文采用铀矿尘颗粒物的呼吸暴露风险评价模型和经两种常用口罩过滤后的铀矿尘颗粒物的粒径和浓度监测数据,对南方某铀矿井下工人进行了呼吸暴露风险评价,计算了铀矿尘颗粒物的呼吸暴露剂量和暴露风险指数。结果表明: 1)在铀矿井下各典型作业场所中,独头巷道、采场和主风机房是铀矿井下工人所受呼吸暴露剂量较大的主要场所; 2)佩戴纱布口罩和KN95口罩后铀矿尘所致剂量分别为0.14~ 2.01 mSv /a、0.03~ 0.53 mSv /a,佩戴KN95型口罩时的呼吸暴露剂量和暴露风险指数明显低于纱布口罩; 3)当铀品位为0.01%~ 1%,铀矿尘质量浓度为0.01~ 0.2 mg /m~3时,铀矿井下工人所受的铀矿尘颗粒物的呼吸暴露剂量及呼吸暴露风险指数都随铀矿尘质量浓度的增加而增大。
语种：
中文
展开
Aspergillus tubingensis介导植酸盐水解促进U(VI)-PO_4~(3-)生物矿化
作者：
王聂颖;张辉;隋阳;陈约余;胡南;...
期刊：
中国环境科学 ,2019年39(5):2161-2169 ISSN：1000-6923
通讯作者：
Ding, D.-X.
作者机构：
南华大学核科学技术学院;南华大学铀矿冶生物技术国防重点学科实验室极贫铀资源绿色开发技术湖南省重点实验室;[胡南; 隋阳; 陈约余; 戴仲然; 丁德馨; 王聂颖; 张辉] 南华大学
通讯机构：
Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, University of South China, Hengyang, China
关键词：
铀污染地表水;生物矿化;植酸盐水解
摘要：
从广东某铀尾矿库水下沉积物中分离筛选出了一株能水解植酸盐的真菌M5-1,对其菌落形态、ITS序列、最适生长pH值、对铀的耐受性及其水解植酸盐的效果进行了分析,随后对M5-1生物矿化铀过程中pH 值、正磷酸盐浓度、铀浓度、铀去除率的变化进行了监测,对矿化产物的主要元素和矿物组成进行了分析.证实了真菌M5-1为Aspergillus tubingensis(MH978623),其最适生长pH 值范围为6~7,对铀(~0.84mmol/L)具有较强的耐受性;Aspergillus tubingensis介导植酸盐水解促进U(VI)-PO_4~(3-)矿化62d后,铀的去除率达95.2%;Aspergillus tubingensis介导U(VI)-PO_4~(3-)矿化过程中可能形成了难溶的氢铀云母和变钠铀云母矿物.结果表明,Aspergillus tubingensis 能有效水解植酸盐释放可溶性正磷酸盐,从而促进U(VI)-PO_4~(3-)矿化.研究结果为采用Aspergillus tubingensis介导植酸盐水解原位修复铀污染地表水提供了试验依据.
语种：
中文
展开
An investigation on physical, mechanical, leaching and radiation shielding behaviors of barite concrete containing recycled cathode ray tube funnel glass aggregate
作者：
Liu, Hualiang;Shi, Jianjun;Qu, Huiqiong;Ding, Dexin*
期刊：
Construction and Building Materials ,2019年201:818-827 ISSN：0950-0618
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Shi, Jianjun; Liu, Hualiang] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Ding, Dexin; Shi, Jianjun; Liu, Hualiang] Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Hunan, Peoples R China.;[Ding, Dexin; Qu, Huiqiong] Univ South China, Nucl Resources Engn Coll, Hengyang 421001, Peoples R China.
通讯机构：
[Ding, Dexin] U;Univ South China, Nucl Resources Engn Coll, Hengyang 421001, Peoples R China.
关键词：
Alkali-silica reaction expansion;Barite concrete;Dry shrinkage;Funnel glass;Lead leaching;MCNP;Physical and mechanical behaviors;Radiation shielding;Waste cathode ray tube;XCOM
摘要：
In order to explore the feasibility of using hazardous waste cathode ray tube (CRT) funnel glass to replace high density mineral aggregates in the radiation shielding concrete, various barite concrete samples were prepared with portland cement, ground funnel glass sand as the substitute for barite aggregates, and fly ash as mineral admixtures, and the rates of funnel glass for fine and coarse (5–10 mm) barite aggregate were 25%, 50%, 75%, 100% and 10%, 20%, 30%, respectively. The work performance, mechanical properties, dry shrinkage, alkali-silica reaction (ASR) expansion and lead leaching were investigated, and the γ-ray attenuation coefficients were obtained by experiment, XCOM program and MCNP code. The results show that the slump, ASR expansion and lead leaching of the concrete increase while its apparent density, mechanical properties, dry shrinkage, and γ-ray shielding properties decrease with the increase of the rate of funnel glass. Adding fly ash to the concrete can inhibit the leaching of Pb, and reduce the ASR expansion. The concrete samples with 25–50% fine funnel glass sand or 10–20% 5–10 mm coarse aggregate have good performances. The results show that it's efficient, economical and environmental-benign to use funnel glass to produce the high density radiation shielding concrete. © 2019 Elsevier Ltd
语种：
英文
展开
Experimental study on radon exhalation behavior of heap leaching uranium ore column with dilute sulfuric acid
作者：
Ye, Yongjun* ;Wang, Zhongkun;Liang, Tao;Ding, Dexin;Feng, Shengyang;...
期刊：
Environmental Science and Pollution Research ,2019年26(20):20308-20315 ISSN：0944-1344
通讯作者：
Ye, Yongjun
作者机构：
[Zhong, Yongming; Ye, Yongjun; Wang, Zhongkun; Feng, Shengyang; Liang, Tao] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Ding, Dexin; Ye, Yongjun] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Ye, Yongjun] U;Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
关键词：
Uranium ore;Heap leaching;Radon exhalation rate;Column leaching test
摘要：
In order to study the radon release behavior when heap leaching uranium ores with dilute sulfuric acid, unleached uranium ores from a uranium mine in southern China were selected as test samples. Adopting parameters from leaching processes commonly used in uranium mines, a laboratory experiment was carried out for 21days with a one-dimensional acid heap leaching experimental column. The surface radon exhalation rate of uranium ore column was determined by static accumulation method while spraying with deionized water and dilute sulfuric acid. The uranium leaching rate and ore column height for all 21days of the experiment were also measured. The results show that (1) when sprayed with a leaching agent, the surface radon exhalation rate of uranium ore column initially increased with time sharply. After a maximum value was reached, the rate gradually decreased and stabilized. When the spraying stopped, the surface radon exhalation rate of uranium ore column initially decreased, before increasing until it tended to stabilize. (2) During the entirety of the 21-day leaching experiment, the cumulative leaching rate of uranium increased gradually with time. On the other hand, the surface radon exhalation rate of uranium ore column fluctuated, but the leaching of uranium from uranium ores had almost no effect on the radon exhalation rate. (3) There was no linear correlation between the surface radon exhalation rate and the residual height of ore column during leaching, but the collapsing event of ore column was the direct inducing factor of the fluctuation of surface radon exhalation rate. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
语种：
英文
展开
Developmental toxicity and apoptosis in zebrafish embryos induced by low-dose -ray irradiation
作者：
Zhao, Weichao;Hu, Nan;Ding, Dexin* ;Long, Dingxin;Li, Sheng;...
期刊：
Environmental Science and Pollution Research ,2019年26(4):3869-3881 ISSN：0944-1344
通讯作者：
Ding, Dexin
作者机构：
[Zhao, Weichao] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Ding, Dexin; Zhang, Hui; Li, Sheng; Li, Guangyue; Hu, Nan] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Long, Dingxin; Zhao, Weichao] Univ South China, Sch Publ Hlth, Hengyang 421001, Peoples R China.
通讯机构：
[Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
关键词：
Apoptosis;Developmental toxicity;Low-dose gamma-ray irradiation;Signaling pathway;Zebrafish embryos
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.
语种：
英文
展开
Identification of Cofilin-1 and Destrin as Potential Early-warning Biomarkers for Gamma Radiation in Mouse Liver Tissues
作者：
Yi, Lan;Hu, Nan;Mu, Hongxiang;Sun, Jing;Yin, Jie;...
期刊：
HEALTH PHYSICS ,2019年116(6):749-759 ISSN：0017-9078
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Yin, Jie; Yi, Lan; Hu, Nan] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.;[Yin, Jie; Yi, Lan; Dai, Keren; Xu, Fanghui; Mu, Hongxiang; Sun, Jing; Yang, Nanyang] Univ South China, Inst Cytol & Genet, Coll Pharmaceut & Biol Sci, Hengyang, Hunan, Peoples R China.
通讯机构：
[Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
关键词：
actin depolymerizing factor;biological marker;Cfl1 protein, mouse;cofilin 1;Dstn protein, mouse;proteome;animal;C57BL mouse;gamma radiation;genetics;liver;male;metabolism;mouse;radiation response;Animals;Biomarkers;Cofilin 1;Destrin;Gamma Rays;Liver;Male;Mice;Mice, Inbred C57BL;Proteome
摘要：
Gamma radiation causes cell injury and leads to an increased risk of cancer, so it is of practical significance to identify biomarkers for gamma radiation. We used proteomic analysis to identify differentially expressed proteins in liver tissues of C57BL/6J mice treated with gamma radiation from 137Cs for 360 d. We confirmed obvious pathological changes in mouse liver tissues after irradiation. Compared with the control group, 74 proteins showed a fold change of ≥1.5 in the irradiated groups. We selected 24 proteins for bioinformatics analysis and peptide mass fingerprinting and found that 20 of the identified proteins were meaningful. These proteins were associated with tumorigenesis, tumor suppression, catalysis, cell apoptosis, cytoskeleton, metabolism, gene transcription, T-cell response, and other pathways. We confirmed that both cofilin-1 and destrin were up regulated in the irradiated groups by western blot and real-time polymerase chain reaction. Our findings indicate that cofilin-1 and destrin are sensitive to gamma radiation and may be potential biomarkers for gamma radiation. Whether these proteins are involved in radiation-induced tumorigenesis requires further investigation. © Lippincott Williams & Wilkins.
语种：
英文
展开
回收CRT锥玻璃部分替代高密度磁铁矿砂在防辐射混凝土中应用的可行性
作者：
Liu, Hua-liang;Shi, Jian-jun;Qu, Hui-qiong;Ding, De-xin*
期刊：
中国有色金属学报(英文版) ,2019年29(4):831-839 ISSN：1003-6326
通讯作者：
Ding, De-xin
作者机构：
[Shi, Jian-jun; Liu, Hua-liang; Ding, De-xin] Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Hunan, Peoples R China.;[Shi, Jian-jun; Liu, Hua-liang] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Qu, Hui-qiong; Ding, De-xin] Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Ding, De-xin] C;[Ding, De-xin] U;Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Hunan, Peoples R China.;Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Peoples R China.
关键词：
cathode ray tube;funnel glass;concrete;gamma-ray;radiation shielding;mechanical properties;Monte-Carlo N-Particle simulation
摘要：
The recycled cathode ray tube (CRT)funnel glass was used as replacement of magnetite sand in the concrete, and its mass replacement rates were 0, 20%, 40% and 60%, respectively. The flowability, apparent density and mechanical properties of the radiation shielding concrete were investigated, while its γ-ray radiation shielding parameters such as linear and mass attenuation coefficients (μ and μm, respectively), thickness values of half-value layer (hHVL)and tenth-value layer (hTVL)were obtained by theoretical calculation, experiment and Monte−Carlo N-Particle (MCNP)simulation code. The experimental results show that the flowability of the concrete increases significantly, whilst its apparent density, compressive strength and static elastic modulus decrease slightly. The calculated, simulated and experimental μm, μ, hHVL and hTVL values of all concrete samples are very consistent at the same γ-ray photon energy, and it is feasible to use MCNP code to simulate γ-ray radiation shielding parameters of materials. The calculated results show that in a wide range of γ-ray photon energy, the μm value of the concrete with CRT funnel glass replacing magnetite sand is improved effectively, and its radiation shielding performances are the same as those of the control concrete (M−1). By comprehensively comparing the flowability, mechanical properties and γ-ray radiation shielding properties, the concrete samples with 20%−40% funnel glass as fine aggregate have good performances. © 2019 The Nonferrous Metals Society of China
语种：
英文
展开
Enhancement of repeated applications of chelates on phytoremediation of uranium contaminated soil by Macleaya cordata.
作者：
Hu, Nan;Lang, Tao;Ding, Dexin* ;Hu, Jingsong;Li, Changwu;...
期刊：
Journal of Environmental Radioactivity ,2019年199-200:58-65 ISSN：0265-931X
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Zhang, Hui; Li, Changwu; Li, Guangyue; Hu, Nan; Hu, Jingsong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, 28 West Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.;[Lang, Tao] Jiangxi Nucl Ind Geol Bur, Brigade 264, Ganzhou 341000, Jiangxi, Peoples R China.
通讯机构：
[Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, 28 West Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.
关键词：
Antioxidants;Bioaccumulation;Biochemistry;Bioremediation;Chelation;Contamination;Enzymes;Oxalic acid;Plants (botany);Soil moisture;Soil pollution control;Uranium;Antioxidant enzyme;Bio-concentration factors;Bioaccumulation factor;Chelates;Environmentally friendly alternatives;Hyperaccumulating plant;Macleaya cordata;Phytoremediation;Soil pollution;ascorbate peroxidase;catalase;chelate;citric acid;ethylenediamine;ethylenediamine disuccinic acid;oxalic acid;peroxidase;superoxide dismutase;transfer factor;unclassified drug;uranium;chelating agent;uranium;antioxidant;bioaccumulation;chelate;citric acid;concentration (composition);herb;hyperaccumulation;phytoremediation;soil pollution;solubilization;uranium;Article;bioaccumulation;biomass;concentration (parameter);controlled study;enzyme activity;greenhouse;leaf tissue;Macleaya cordata;oxidative stress;phytoavailability;phytoremediation;phytotoxicity;plant cell;shoot growth;soil acidity;soil pollution;solubilization;Viridiplantae;bioremediation;chemistry;metabolism;Papaveraceae;physiology;soil pollutant;Macleaya cordata;Biodegradation, Environmental;Chelating Agents;Papaveraceae;Soil Pollutants, Radioactive;Uranium
摘要：
A greenhouse pot experiment was performed to investigate the enhancement of repeated applications of citric acid (CA), ethylenediamine disuccinic acid (EDDS), and Oxalic acid (OA) on phytoremediation of uranium (U) contaminated soil by Macleaya Cordata. The chelates followed the order CA > EDDS > OA in terms of the enhancement on uranium uptake by M. cordata. The repeated applications of the chelates were found to be more effective than the one time application at the equal dose as the U concentration of soil solution increased significantly from the 8th to 14th day. The repeated applications of 10 mmol kg -1 CA promoted the solubilization of U in the U-contaminated soil by significantly decreasing the pH of soil solution, achieved the maximum U concentration of soil solution (1463.6 µg L −1 ), bioconcentration factors (BCFs, 11.4), bioaccumulation factors (BAFs, 21.4) and transfer factors (TFs, 1.9), which were 215.2, 5.7, 30.6 and 16.3 times as compared with the control group, respectively. The three applied chelates significantly affected the activities of the antioxidant enzymes in the leaves. Repeated applications of CA further enhanced the activities of the antioxidant enzymes in the leaves of M. cordata as compared with the control, EDDS and OA, mitigated the oxidative stress induced by uranium and chelates, and maximized the enhancement on the uranium uptake, which will be beneficial for the enhancement on the phytoremediation of uranium contaminated soil by U hyperaccumulating plants. These results indicated that the phytoavailability of uranium in soil solution as well as the accumulation of U by M. cordata were both significantly increased after repeated applications of CA, and that the repeated applications of 10 mmol kg -1 CA increased the activities of the antioxidant enzymes and promoted U accumulation by M. cordata. The study provided an environmentally friendly alternative for the enhancement on the phytoremediation of uranium contaminated soil using M. cordata. © 2018 Elsevier Ltd
语种：
英文
展开
Study on the influence of temperature and humidity on radon exhalation from a radon-containing solution
作者：
Zhou, Ju;Ding, Dexin* ;Ye, Jiang
期刊：
Journal of Radioanalytical and Nuclear Chemistry ,2018年318(2):1099-1107 ISSN：0236-5731
通讯作者：
Ding, Dexin
作者机构：
[Zhou, Ju] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Ding, Dexin; Zhou, Ju] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.;[Ye, Jiang] Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
关键词：
Radon-containing solution;Radon exhalation rate;Transfer radon velocity;Temperature;Humidity
摘要：
The radon exhalation rate and transfer radon velocity between liquid and gas under different temperature and humidity conditions are investigated. The fitting formulas of radon exhalation rate and temperature and humidity are exponential functions, and each exponent is a 2nd-order polynomial. The fitting formula of transfer radon velocity and temperature is Boltzmann function, and the velocity tends to be stable gradually at 25°C. The fitting formula of transfer radon velocity and humidity is exponential function whose exponent is a 2nd order polynomial, and the velocity increases at first when the humidity was 0.75, then decreases with increasing humidity. © 2018, Akadémiai Kiadó, Budapest, Hungary.
语种：
英文
展开
基于图像分析的堆浸铀矿石颗粒参数辨识
作者：
宁志刚;郝光鹏;程雄;沈文斌;丁德馨
期刊：
北京理工大学学报 ,2018年38(3):300-304 and 312 ISSN：1001-0645
作者机构：
[宁志刚; 郝光鹏; 程雄; 沈文斌] College of Electrical Engineering, University of South China, Hengyang;Hunan;421001, China;[丁德馨] School of Nuclear Resource Engineering, University of South China, Hengyang;[宁志刚; 郝光鹏; 程雄; 沈文斌; 丁德馨] Hunan
关键词：
颗粒参数;引导滤波;PCNN模型;凹点匹配;形状特征
摘要：
采用数字图像处理技术对铀矿石颗粒参数进行测量,并确定铀矿石块度分布.首次将图像引导滤波器应用于矿石图像滤波,较好地滤除了图像噪声和保持矿石边缘细节信息.采用基于最大类间后验交叉熵准则的PCNN图像分割算法分割矿石图像,减少了矿石粘连现象.为了解决第一次分割后矿石粘连现象,采用基于凹点匹配的数字图像切割算法对粘连的矿石图像进行第二次分割,能有效分离粘连矿石图像.采用基于形状特征的颗粒参数测量法测量颗粒参数,提高了颗粒参数的测量精度,得到了矿石块度的统计分布图.实验数据表明,该方法测量误差较小,能满足实际需求.
语种：
中文
展开
Experimental Study on Bioclogging in Porous Media during the Radioactive Effluent Percolation
作者：
Gui, Rong;Pan, Yu-xiang;Ding, De-xin* ;Liu, Yong;Zhang, Zhi-jun*
期刊：
Advances in Civil Engineering ,2018年2018:1-6 ISSN：1687-8086
通讯作者：
Ding, De-xin;Zhang, Zhi-jun
作者机构：
[Gui, Rong; Ding, De-xin] Cent South Univ, Sch Resources & Safety Engn, Changsha 420083, Hunan, Peoples R China.;[Pan, Yu-xiang; Zhang, Zhi-jun; Gui, Rong; Liu, Yong; Ding, De-xin; Zhang, ZJ] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.;[Pan, Yu-xiang; Zhang, Zhi-jun; Gui, Rong; Liu, Yong; Ding, De-xin; Zhang, ZJ] Univ South China, Nucl Resource Engn Coll, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Ding, De-xin] C;[Ding, DX; Zhang, ZJ] U;Cent South Univ, Sch Resources & Safety Engn, Changsha 420083, Hunan, Peoples R China.;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Nucl Resource Engn Coll, Hengyang 421001, Hunan, Peoples R China.
摘要：
<jats:p>The sand columns inoculated with the indigenous microorganism (<jats:italic>Aspergillus niger</jats:italic>) were used to investigate the effect of bioclogging during the radioactive effluent percolation. The hydraulic gradient, volumetric flow rate, and uranyl ions concentration were monitored over time. The sand columns were operated with continuous radioactive effluent of uranium tailings reservoir. After 68 days, the hydraulic conductivity of the sand columns decreased more than 72%, and the adsorption rate of uranyl ions by <jats:italic>Aspergillus niger</jats:italic> reached more than 90%. Environmental scanning electron microscope imaging confirmed the biofilm covering the surface of sand particles and connecting sand particles together, which resulted in a reduction of hydraulic conductivity. The results indicated that the propagation of <jats:italic>Aspergillus niger</jats:italic> can clog the seepage channel and effectively adsorb the uranyl ions of radioactive effluent in the porous media, which provides a suitable measure for controlling the migration of radioactive effluent of uranium tailings reservoir into the subsurface environment.</jats:p>
语种：
英文
展开
铀矿排风井周边地表大气氡致辐射效应的数值模拟
作者：
叶勇军;李实;黄春华;丁德馨;钟永明;...
期刊：
南华大学学报(自然科学版) ,2018年32(1):1-9 ISSN：1673-0062
作者机构：
南华大学 环境与安全工程学院,湖南 衡阳421001;南华大学 铀矿冶生物技术国防重点学科实验室,湖南 衡阳421001;南华大学 环境与安全工程学院,湖南 衡阳,421001;南华大学 土木工程学院,湖南 衡阳,421001;南华大学 铀矿冶生物技术国防重点学科实验室,湖南 衡阳,421001
关键词：
高斯烟羽模型;铀矿排风井;氡浓度;公众个人剂量
摘要：
为了指导铀矿排风井周边地表环境的辐射防护设计,基于放射性气态流出物大气扩散的高斯烟羽模型,建立了铀矿排风井周边地表年均氡浓度以及公众个人年有效剂量的数学计算模型,研究了排风井气态流出物初始氡浓度、排风风量和源强对排风井周边地表1 km范围内年均氡浓度以及公众个人年有效剂量分布的影响.结果表明,在其他参数不变的情况下,年均氡浓度和公众个人年有效剂量的最大值随气态流出物初始氡浓度的增加而增大,随排风风量的增加而减小;最大值离井口的距离和氡致辐射的影响范围随初始氡浓度的增加而增大,随排风风量的增加而减小;相同源强下,最大值随气态流出物的初始氡浓度增加而增大,随排风风量的增大而减小;最大值离井口的距离随排风风量的增加而增大.最后,根据所得结论提出铀矿排风井周边的辐射防护建议.
语种：
中文
展开
地下铀矿山留矿法采场受限空间内氡迁移的数值模拟
作者：
叶勇军;苏杭;丁德馨;雷波;冯胜洋;...
期刊：
安全与环境学报 ,2018年18(1):217-223 ISSN：1009-6094
作者机构：
南华大学环境与安全工程学院, 湖南, 衡阳, 421001;南华大学, 铀矿冶生物技术国防重点学科实验室, 湖南, 衡阳, 421001;[叶勇军] 南华大学环境与安全工程学院, 湖南, 衡阳, 421001 南华大学, 铀矿冶生物技术国防重点学科实验室, 湖南, 衡阳, 421001;[苏杭; 雷波; 冯胜洋; 梁涛; 张运锋] 南华大学环境与安全工程学院, 湖南, 衡阳, 421001;[丁德馨] 南华大学, 铀矿冶生物技术国防重点学科实验室, 湖南, 衡阳, 421001
关键词：
安全工程;留矿法;氡浓度;颗粒堆积型;数值模拟;通风条件
摘要：
为研究铀矿山留矿法采场氡迁移规律,依据留矿法采场的构造和物理几何尺寸,建立了受限空间内颗粒堆积型射气介质气体流动的数学模型和氡迁移方程,以10 m和20 m高爆破矿堆为对象,采用计算流体力学(CFD)方法,研究了不同通风条件下采场中氡的迁移规律。结果表明:1)采场下行通风方式降低矿堆上部作业空间氡浓度的效果优于上行通风方式,但对采场运输巷道氡浓度的效果相反;采场排风氡浓度与采场通风风量成反比,氡析出份额与通风风量成正比;2)在相同通风风量下,10 m高爆破矿堆与20 m高爆破矿堆氡析出份额之差随通风风流量增长而逐渐缩小;3)均压通风对渗透率高(k=1×10~(-8) m~2)的采场排风氡浓度、矿堆氡析出份额有明显影响。
语种：
中文
展开
Preparation of Polyamidoxime/Magnetic Graphene Oxide Composite and Its Application for Efficient Extraction of Uranium(VI) from Aqueous Solutions in an Ultrasonic Field
作者：
Dai, Zhongran;Zhang, Hui;Sui, Yang;Ding, Dexin* ;Li, Le
期刊：
Journal of Chemical and Engineering Data ,2018年63(11):4215-4225 ISSN：0021-9568
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Zhang, Hui; Li, Le; Dai, Zhongran] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Sui, Yang] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Sui, Yang] Fujian Fuqing Nucl Power Co Ltd, Fuqing 350300, Peoples R China.
通讯机构：
[Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
关键词：
Adsorption;Binding energy;Chemicals removal (water treatment);Extraction;Free radical polymerization;Graphene;Radioactive wastes;Radioactivity;Solutions;Uranium metallurgy;Adsorption equilibria;Adsorption kinetics and isotherm;Adsorption performance;Endothermic process;Pseudo second order;Radioactive wastewater;Reversible addition-fragmentation chain transfer polymerization;Thermodynamic parameter;Uranium compounds
摘要：
In this work, the polyamidoxime functionalized magnetic graphene oxide (mGO-PAO) was prepared via the surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization, characterized by TEM, FT-IR, VSM, and TGA techniques, and applied for the extraction of uranium(VI) from aqueous solutions in an ultrasonic field. The effects of pH, contact time, initial uranium(VI) concentration, temperature, and competitive ions on the adsorption of U(VI) were investigated. The adsorption speed of mGO-PAO for U(VI) was found to be 18 times faster in the ultrasonic field than in the shaking mode, and the adsorption equilibrium, to be reached within 2 min. When the U(VI) concentration was 10 mg/L, the temperature, 298 K, and pH, 6.0, the removal rate of U(VI) reached 98.24% with high selectivity. The adsorption kinetics and isotherm data were well described by the pseudo-second-order and Langmuir models, respectively. The thermodynamic parameters suggested that the adsorption of U(VI) was a typical spontaneous and endothermic process. XPS analysis suggested that the mGO-PAO bound the U(VI) through the η2-N,O binding mode. Moreover, the mGO-PAO exhibits excellent adsorption performance in actual radioactive wastewater with an assist of ultrasound. This work provides a new approach for highly effective extraction of U(VI) from the actual radioactive wastewater. © 2018 American Chemical Society.
语种：
英文
展开
博落回和竹柳间作修复铀污染土壤的研究
作者：
陈威;胡南;陈可;陈思羽;张辉;...
期刊：
原子能科学技术 ,2018年52(10):1748-1755 ISSN：1000-6931
通讯作者：
Ding, Dexin(dingdxzzz@163.com)
作者机构：
[陈威; 胡南; 陈可; 陈思羽; 张辉; 丁德馨] Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;421001, China;Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang;[陈威; 胡南; 陈可; 陈思羽; 张辉; 丁德馨] 421001, China <&wdkj&> Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang;[陈威; 胡南; 陈可; 陈思羽; 张辉; 丁德馨] 421001, China
通讯机构：
Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China
关键词：
植物修复;铀;博落回;竹柳;间作
摘要：
采用铀富集植物向日葵、博落回和竹柳进行单作与间作,开展铀污染土壤修复实验,研究了各植物富集铀的性能、根际土壤中微生物群落、有机酸含量以及铀的化学形态变化。结果表明,与单作相比,博落回和竹柳间作时,它们对铀的富集量分别提高了183.50%和24.93%,转运系数分别提高了120.31%和104.3%,修复效率最高。博落回和竹柳间作时,根际土壤中耐受菌Acidobacteria、促生菌Bradyrhizobium以及分泌有机酸真菌Aspergillus的比例显著升高,草酸和丙二酸的含量明显增加。Acidobacteria和Bradyrhizobium等细菌提高了植物对铀的耐受性能和富集性能,Aspergillus分泌的有机酸与铀形成螯合物,增加了土壤中可交换态铀的比例。这些可能是博落回和竹柳间作时修复效率显著高于两者单作时的主要机理。
语种：
中文
展开
铀矿石酸化-细菌柱浸的动力学分析
作者：
刘玉龙;李广悦;王有团;胡南;喻清;...
期刊：
原子能科学技术 ,2018年52(2):227-234 ISSN：1000-6931
通讯作者：
Ding, Dexin(dingdx@nhu.edu.cn)
作者机构：
[刘玉龙; 李广悦; 王有团; 胡南; 喻清; 丁德馨] Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;421001, China;[马亮] CGNPC Uranium Resources Co., Ltd., Beijing;100029, China;[刘玉龙] 421001, China <&wdkj&> CGNPC Uranium Resources Co., Ltd., Beijing
通讯机构：
Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China
会议名称：
中国原子能科学研究院第31届“五四”青年学术报告会
会议时间：
2017-04-27
会议地点：
北京
会议论文集名称：
中国原子能科学研究院第31届“五四”青年学术报告会论文集
关键词：
铀矿石;酸化浸出;细菌浸出;通气柱浸;分段动力学
摘要：
研究了沥青铀矿石酸化阶段和细菌浸出阶段体系中pH值、Eh值和浸出率随时间的变化规律,采用JMA动力学模型分析了酸化过程和细菌浸出过程的动力学行为特征。结果表明:在酸化阶段,同一级数中各酸化体系的pH值和浸出率随酸化时间的增加而升高,Eh值随酸化时间的增加而降低;在细菌浸出阶段,同一级数中各浸出体系的pH值、Eh值和浸出率随浸出时间的增加而升高;随着酸化级数和细菌浸出级数的增加,各酸化体系和浸出体系的pH值、Eh值和浸出率随时间的变化量减小。动力学分析结果表明:酸化阶段的动力学方程为-ln(1-α)=(0.534 9~0.310 3)t~(0.175 7~0.701 6),初、中期反应过程属于扩散控制,后期反应过程属于混合控制;细菌浸出阶段的动力学方程为-ln(1-α)=(0.132 5~0.002 3)·t~(0.212 7~2.033 0),初期反应过程属于扩散控制,中期反应过程属于混合控制,后期反应速率接近于零。
语种：
中文
展开
Effect of bicarbonate on aging and reactivity of nanoscale zerovalent iron (nZVI) toward uranium removal
作者：
Hua, Yilong;Wang, Wei;Huang, Xiaoyue;Gu, Tianhang;Ding, Dexin;...
期刊：
Chemosphere ,2018年201(Jun.):603-611 ISSN：0045-6535
通讯作者：
Ling, Lan;Zhang, Wei-xian
作者机构：
[Hua, Yilong; Huang, Xiaoyue; Zhang, Wei-xian; Ling, Lan; Zhang, WX; Gu, Tianhang] Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, 1239 Siping Rd, Shanghai 200092, Peoples R China.;[Wang, Wei] Tongji Univ, Sch Chem Sci & Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China.;[Ding, Dexin] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, 28 West Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Ling, L; Zhang, WX] T;Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, 1239 Siping Rd, Shanghai 200092, Peoples R China.
关键词：
Nanoscale zerovalent iron (nZVI);Aging;Bicarbonate;Heavy metals;Uranium
摘要：
Bicarbonate, ubiquitous in natural and waste waters is an important factor regulating the rate and efficiency of pollutant separation and transformation. For example, it can form complexes with U(VI) in the aqueous phase and at the solid-water interface. In this work, we investigated the effect of bicarbonate on the aging of nanoscale zero-valent (nZVI) in the context of U(VI) reduction and removal from wastewater. For fresh nZVI, over 99% aqueous uranium was separated in less than 10 min, of which 83% was reduced from U(VI) to U(lV). When nZVI was aged in water, its activity for U(VI) sequestration and reduction was significantly reduced. Batch experiments showed that for nZVI aged in the presence of 10 mM bicarbonate, only 203% uranium was reduced to U(IV) after 6 h reactions. Characterizations of the iron nanoparticles with spherical aberration corrected scanning transmission electron microscopy (Cs-STEM) suggest that in fresh nZVI, uranium was concentrated at the nanoparticle center; whereas in nZVI aged in bicarbonate, uranium was largely deposited on the outer surface of the nanoparticles. Furthermore, aged nZVI without bicarbonate contained more lepidocrocite (gamma-FeOOH) while aged nZVI in the presence of bicarbonate had more magnetite/maghemite (Fe3O4/gamma-Fe2O3). This could be attributed to the formation of carbonate green rust and pH buffer effect of HCO1-/CO32:. Primary mechanisms for U(VI) removal with nZVI include reduction, sorption and/or precipitation. Results demonstrate that bicarbonate alter the aging products of nZVI, and reduces the separation efficiency and reduction capability for uranium removal. (C) 2018 Published by Elsevier Ltd.
语种：
英文
展开
β-甘油磷酸钠修复含铀地下水
作者：
黄超;张辉;胡南;丁德馨;李殿鑫;...
期刊：
中国环境科学 ,2018年38(9):3391-3397 ISSN：1000-6923
通讯作者：
Ding, D.-X.
作者机构：
南华大学,铀矿冶生物技术国防重点学科实验室,湖南 衡阳 421001;南华大学,极贫铀资源绿色开发技术湖南省重点实验室,湖南 衡阳 421001;[黄超; 张辉; 胡南; 丁德馨; 李殿鑫; 孙静] 南华大学, 铀矿冶生物技术国防重点学科实验室, 湖南, 衡阳, 421001 南华大学, 极贫铀资源绿色开发技术湖南省重点实验室, 湖南, 衡阳, 421001
通讯机构：
Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China
关键词：
β-甘油磷酸钠;含铀地下水;生物还原;生物矿化;原位固定
摘要：
利用微模型实验,研究β-甘油磷酸钠修复含铀地下水的效果,监测厌氧培养过程中硝酸盐、硫酸盐、磷酸盐、pH值和铀浓度的变化,分析沉积物中铀的化学形态以及U(IV)的比例.结果表明:厌氧培养25d后,β-甘油磷酸钠组和甘油组的铀浓度分别从2.96,2.99mg/L降低到0.030,0.044mg/L,达到了我国《铀矿冶辐射防护和环境保护规定(GB23727-2009)》规定的排放标准.β-甘油磷酸钠作为碳源和磷源能够降低沉积物中可交换态和碳酸盐结合态铀的比例,并能提高沉积物中铁锰氧化物结合态,有机结合态和残渣态铀的比例;厌氧培养25d后,β-甘油磷酸钠组沉积物中U(IV)的比例达到了91.79%,比甘油组提高了28.82%,厌氧培养45d后,β-甘油磷酸钠组沉积物中U(IV)的比例基本保持不变,而甘油组则下降了7.98%.β-甘油磷酸钠作为碳源和磷源,能够促进U(VI)的生物还原和矿化从而将铀原位固定.
语种：
中文
展开
