作者： Cai, Zi-qi;Li, Xiang-yang*;Lei, Bo*;Yuan, Jing-fan;Hong, Chang-shou;...

期刊： Sustainability,2018年10(8):2937- ISSN：2071-1050

通讯作者： Li, Xiang-yang;Lei, Bo

作者机构： [Yuan, Jing-fan; Cai, Zi-qi; Li, Xiang-yang; Lei, Bo] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Cai, Zi-qi; Hong, Chang-shou; Wang, Hong; Li, Xiang-yang] Univ South China, Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Peoples R China.

通讯机构： [Li, XY; Lei, B; Li, Xiang-yang] U;Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.;Univ South China, Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Peoples R China.

关键词： uranium;similar materials;low-frequency vibration;radon exhalation rate;porosity

摘要： It is the fact that there are lots of hazard incidents in underground uranium mines caused by radon but in-suit uranium samples were difficult to collect. Based on closed chamber method, three similar samples in different sealed ways were made in a laboratory with different material rations, namely uranium tailings, quartz sand, cement, iron powder and silicon powder to measure the radon concentrations with and without low-frequency vibrations, which was used by the experimental device for low-frequency vibration diffusion of radon. The results showed that the radon exhalation coming from the similar samples was influenced by the low frequency vibration; the results are presented as two-stage variations compared with the blank group. The radon exhalation increased with the rising vibration frequency when the frequency was 50 to 70 Hz, but fell slowly after reaching the peak radon exhalation rate. Analyses of the relations between the rock damage degree, changes in porosity and the occurrence of an inflection point in the radon exhalation rate in the samples found that they also increased when the frequency was between 0 to 80 in sample 3. The maximum porosity of the third samples was about 4.8% with a low-frequency vibration 60 Hz, while the maximum damage degree was about 0.07 at 50 Hz.

语种： 英文

作者： Xie, Ling-feng;Zou, Shu-liang;Li, Xiang-yang;Hong, Chang-shou*;Wang, Hong;...

期刊： Sustainability,2018年10(9):3005 ISSN：2071-1050

通讯作者： Hong, Chang-shou

作者机构： [Yuan, Jing-fan; Xie, Ling-feng; Li, Ming; Hong, Chang-shou; Cai, Zi-qi; Wang, Hong; Zhang, Shuai; Zou, Shu-liang; Li, Xiang-yang] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Xie, Ling-feng; Hong, Chang-shou; Li, Xiang-yang] Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Peoples R China.;[Zou, Shu-liang] Hunan Prov Key Lab Emergency Safety Technol & Equ, Hengyang 421001, Peoples R China.

通讯机构： [Hong, Chang-shou] U;[Hong, Chang-shou] H;Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.;Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Peoples R China.

关键词： water-bearing porous media;ultrasonic effect;radon exhalation rate;radon earthquake precursor

摘要： Radon is internationally recognized as one of the seven seismic precursors. A self-assembly ultrasonic generator and experimental apparatus for radon measurement were utilized to explore the radon exhalation regularities of water-bearing porous media under different ultrasonic intensities. The experimental results showed that there was a coupling relationship among radon exhalation rate, moisture content, and ultrasonic frequency. With the increase of the frequency of the ultrasonic wave, its effect on the promotion of radon exhalation rate was found to be a more obviously positive linear correlation. The radon exhalation rate, which could climb to a maximum value of 0.179 Bq·m-2·s-1 in a naturally air-dried sample, increased at first and then decreased along with increased moisture content. Moreover, this study found that the ultrasonic wave had the most remarkable promoting effects on the radon exhalation rate of porous media with high moisture content, and there is a positive linear correlation between the growth rate of the radon exhalation rate and moisture content. The experimental results could provide a beneficial reference for the continual monitoring of radon in a seismically active belt and an explanation of radon anomalies; however, the proposed experimental model was simplified, so further insights are strictly required for a reliable correlation with the real monitoring of radon in a seismically active belt. © 2018 by the authors.

语种： 英文

作者： Xu, Shoulong;Zou, Shuliang*;Han, Yongchao;Qu, Yantao

期刊： Sustainability,2018年10(7):2172 ISSN：2071-1050

通讯作者： Zou, Shuliang

作者机构： [Xu, Shoulong; Zou, Shuliang] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Xu, Shoulong] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China.;[Han, Yongchao; Qu, Yantao] China Inst Atom Energy, Beijing 102413, Peoples R China.

通讯机构： [Zou, Shuliang] U;Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.

关键词： active pixel sensor;video monitor;radiation detector;radiation damage;radiation response;nuclear accident

摘要： In this paper, we present the availability of an active pixel sensor (APS) with four transistors (4T) as a video monitor and radiation detector. Analyzing radiation damage must be one of the first steps in recovering from nuclear accidents, and the radiation response characteristic is the basis for the use of 4T-APS to detect radiation. The goal of this work is to suggest the use of cameras with 4T-APS in widely distributed irradiation detectors. The total ionizing dose (TID) of radiation damage on 4T-APS provided a threshold. Radiation tolerance was improved with the help of a radiation shielding structure. The radiation response showed integration time dependence and pixel information dependence, and greater radiation response was observed from the pixels with lower grayscale values. Two methods are suggested based on different monitoring scenes. This study can help to greatly improve nuclear accident emergency response and the safety of nuclear facilities.

语种： 英文

作者： Guo, Qian;Chen, Zhenping*

期刊： Sustainability,2018年10(7):2272 ISSN：2071-1050

通讯作者： Chen, Zhenping

作者机构： [Guo, Qian] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Chen, Zhenping] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Chen, Zhenping] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

关键词： Monte Carlo;neutron tracking;multi-regional;delta-tracking;criticality calculation

摘要： The Monte Carlo method has been widely used as a standard method to perform neutron transport simulations in reactor physics. In conventional Monte Carlo codes corresponding to the neutron transport tracking with ray-tracing method, the distances to material boundaries must be computed frequently when the neutron changes its kinetic energy or moving into new material regions to determine the neutron transport length. However, if the neutron's mean free path length, to some extent, is greater than the macro size of the model, a huge amount of distances need to be computed. As a result, the computational efficiency of the neutron transport tracking will be degraded. An improved multi-regional delta-tracking method based on domain decomposition was introduced to solve this problem, in which the original heterogeneous model would be decomposed into many sub-regions and each sub-region was tracked using a local delta-tracking method. Consequently, the computational efficiency of the neutron transport tracking can be improved theoretically without the unnecessary distance calculations. The improved multi-regional delta-tracking method was incorporated into the MOSRT system, which is a multi-objective modeling and simulation platform for radiation transport system. Finally, the method was validated using the criticality benchmarks and its accuracy and efficiency were demonstrated in Monte Carlo criticality calculation. The results indicated that the new method was consistent with the conventional methods, but with a more competitive run-time performance. © 2018 by the authors.

语种： 英文

作者： Liang, Wei-zhang;Zhao, Guo-yan*;Hong, Chang-shou

期刊： Journal of Cleaner Production,2018年196:1365-1378 ISSN：0959-6526

通讯作者： Zhao, Guo-yan

作者机构： [Liang, Wei-zhang; Zhao, Guo-yan] Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China.;[Hong, Chang-shou] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.

通讯机构： [Zhao, Guo-yan] C;Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China.

关键词： Decision making;Linguistics;Sustainable development;Chemical firms;Circular economy;Performance evaluations;Qualitative flexible (QUALIFLEX) method;Vlsekriterijumska optimizacija i kompromisno resenje (VIKOR);Phosphorus

摘要： Confronting the dilemma of resource shortage and environmental pollution, the idea of circular economy (CE) has attracted widespread attentions. To address these problems, several industrial companies have incorporated the CE in their operation or design. In this sense, the phosphorus chemical firms (PCFs) are promoting CE to achieve sustainable development goals since phosphorus is a non-renewable resource and one of the nutrient elements essential for crop growth. Thus, this paper aims to find a suitable way to assess the performance of CE for PCFs. Firstly, the evaluation index system of CE is designed according to the characteristics of CE for PCFs. Then, a new framework based on the qualitative flexible (QUALIFLEX) and Vlsekriterijumska Optimizacija I Kompromisno Resenje (VIKOR) methods is established to pick out the best enterprise. The linguistic neutrosophic number (LNN) is advised to describe decision making information with linguistic true, hesitant and false membership degree. Moreover, an entropy-based approach is used to determine the index weights, and the VIKOR method is presented to determine the concordance index. After that, all possible permutations are itemized, and the ranking result is obtained according to the general concordance index values of each permutation. Finally, an example of assessing the performance of CE for PCFs in China is given to illustrate the proposed method, and its feasibility is demonstrated. The robustness and advantage of this approach are also indicated with sensitivity and comparison analysis. The results show that the proposed VIKOR-QUALIFLEX method is reliable and stable for assessing the performance of CE for PCFs, and provides references for the construction and management of CE for PCFs. © 2018 Elsevier Ltd

语种： 英文