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Yang Z.-Y.,Chang'an University | Yang Z.-Y.,Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Regions of Ministry of Education | Fan L.-M.,The Geological Environmental Monitoring Station in Shaanxi Province | Xu D.-K.,Chang'an University | And 8 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2017

High intensive coal mining will impact on the moisture and eco-environment in the Blown-sand Region of the Northern Shaanxi Province. On the fissure of cut of No. 20108 coal face in the Yushuwan coal, by means of combination between in-situ field monitoring and numerical simulation, a coupling model between moisture and heat on the influence of the fissure due to coal mining on the moisture transportation of the vadose zone was established. After validation and calibration with field monitoring data from July 17th to 20th and July 25th to 30th, 2014 respectively, relative moisture and heat parameters could be acquired. Then this model can answer the influence degree and reveal the influence mechanism of fissures on moisture transportation. All these can provide reference for coal mining under water-containing and ecological restoration in the Blown-sand Region of the Northern Shaanxi Province and other similar regions. © 2017, Editorial Office of Journal of China Coal Society. All right reserved.


Jiao L.,Xi'an Shiyou University | Jiao L.,Northwest University, China | Xue Z.,No 203 Research Institute Of Nuclear Industry | Wang G.,No 203 Research Institute Of Nuclear Industry | And 2 more authors.
Chemometrics and Intelligent Laboratory Systems | Year: 2015

Retention time shift is a significant impediment against analyzing chromatographic fingerprints of Traditional Chinese Medicine (TCM) with similarity estimation and pattern recognition methods. This work aims at developing a fingerprint preprocessing method that can eliminate the negative effect of retention time shift on similarity estimation and pattern recognition analysis in the quality evaluation of TCM. Both simulated chromatograms and experimental chromatographic fingerprints of Radix Puerariae thomsonii (RPT) were investigated in order to evaluate the practicality of the proposed method. Fourier transform (FT) was used to process these chromatographic signals. The magnitude data of these signals were calculated. In the obtained magnitude data, the negative effect of retention time shift was successfully excluded. Thus, the quality of the investigated RPT samples can be correctly evaluated by using the magnitude data as the input variables of similarity estimation and pattern recognition analysis. It is demonstrated that FT is a practicable and promising method for preprocessing chromatographic fingerprints of TCM prior to similarity estimation and pattern recognition analysis. © 2014 Elsevier B.V.


Jiao L.,Xi'an Shiyou University | Jiao L.,Northwest University, China | Wang X.,Xi'an Shiyou University | Bing S.,Xi'an Shiyou University | And 2 more authors.
RSC Advances | Year: 2015

The quantitative structure property relationship (QSPR) for the photolysis half-life (t1/2) of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) on spruce (Picea abies (L.) Karst.) needle surfaces under sunlight irradiation was investigated. Molecular distance-edge vector (MDEV) index was used as the structural descriptor of PCDD/Fs. The quantitative relationship between the MDEV index and log t1/2 was modeled by using multivariable linear regression (MLR) and artificial neural network (ANN) respectively. Leave-one-out cross validation and external validation were carried out to assess the prediction ability of the developed models. For the MLR method, the prediction root mean square relative error (RMSRE) of leave-one-out cross validation and external validation is 3.47 and 4.25 respectively. For the ANN method, the prediction RMSRE of leave-one-out cross validation and external validation is 2.68 and 3.52 respectively. It is demonstrated that there is a quantitative relationship between the MDEV index and log t1/2 of PCDD/Fs. Both MLR and ANN are practical for modeling this relationship. The developed MLR model and ANN model can be used to predict the log t1/2 of PCDD/Fs. Thus, the log t1/2 of each PCDD/F congener was predicted by using the developed models. © The Royal Society of Chemistry 2015.


Liu C.,Wuhan University | Lu L.,Wuhan University | Huang T.,Wuhan University | Huang Y.,Wuhan University | And 2 more authors.
International Journal of Environmental Research and Public Health | Year: 2016

Exponential industrialization and rapid urbanization have resulted in contamination of soil by metals from anthropogenic sources in Dongguan, China. The aims of this research were to determine the concentration and distribution of various metals (arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu), mercury (Hg), nickel (Ni), lead (Pb) and zinc (Zn)) in soils and identify their potential health risks for local residents. A total of 106 soil samples were collected from the vicinity of industrial sites in Dongguan. Two types of samples were collected from each site: topsoil (0-20 cm, TS) and shallow soil (20-50 cm, SS). Results showed that the soils were contaminated by metals and pollution was mainly focused on TS. The geoaccumulation index (Igeo) and pollution indexes (PI) implied that there was a slight increase in the concentrations of Cd, Cu, Hg, Ni, and Pb, but the metal pollution caused by industrial activities was less severe, and elements of As and Cr exhibited non-pollution level. The risk assessment results suggested that there was a potential health risk associated with As and Cr exposure for residents because the carcinogenic risks of As and Cr via corresponding exposure pathways exceeded the safety limit of 10- 6 (the acceptable level of carcinogenic risk for humans). Furthermore, oral ingestion and inhalation of soil particles are the main exposure pathways for As and Cr to enter the human body. This study may provide basic information of metal pollution control and human health protection in the vicinity of industrial regions. © 2016 by the authors; licensee MDPI, Basel, Switzerland.


Wang L.,China University of Petroleum - Beijing | Mao Z.,China University of Petroleum - Beijing | Sun Z.,Petrochina | Luo X.,Petrochina | And 2 more authors.
The Scientific World Journal | Year: 2013

In the Junggar basin, northwest China, many high gamma-ray (GR) sandstone reservoirs are found and routinely interpreted as mudstone non-reservoirs, with negative implications for the exploration and exploitation of oil and gas. Then, the high GR sandstone reservoirs' recognition principles, genesis, and log evaluation techniques are systematically studied. Studies show that the sandstone reservoirs with apparent shale content greater than 50% and GR value higher than 110API can be regarded as high GR sandstone reservoir. The high GR sandstone reservoir is mainly and directly caused by abnormally high uranium enrichment, but not the tuff, feldspar or clay mineral. Affected by formation's high water sensitivity and poor borehole quality, the conventional logs can not recognize reservoir and evaluate the physical property of reservoirs. Then, the nuclear magnetic resonance (NMR) logs is proposed and proved to be useful in reservoir recognition and physical property evaluation. © 2013 Liang Wang et al.


Xue Z.-W.,No 203 Research Institute Of Nuclear Industry | Gao M.-M.,No 203 Research Institute Of Nuclear Industry | Qiao N.-Q.,No 203 Research Institute Of Nuclear Industry | Wang Q.,No 203 Research Institute Of Nuclear Industry | Zhu X.-X.,No 203 Research Institute Of Nuclear Industry
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2014

In order to reduce the measurement error caused by different sample thickness and density, the author uses compression method to get detection sample. The sample is sealed in a sample box to achieve balance, then we measure the radium content of uranium ore by using High purity germanium(HPGe) γ spectrometer. The result is corrected by 152Eu to avoid the electromagnetic disturbances. The relative standard deviation (RSD %) of the determination results is 2.43%. Comparing with the emanation method results, the relative error are between -5.31%~ 6.62%. The method is able to meet the demands due to its advantages of easy operation and rapidness, the high precision and accuracy. ©, 2014, Atomic Energy Press. All right reserved.


He J.-G.,No 203 Research Institute Of Nuclear Industry | Lei Y.,No 203 Research Institute Of Nuclear Industry | Xi Z.,No 203 Research Institute Of Nuclear Industry | Li J.-A.,No 203 Research Institute Of Nuclear Industry
Dizhen Dizhi | Year: 2013

In this paper we introduce a new kind of TEM sounding configuration: Outside-loop sounding configuration, which measures a sounding spot 20~25 meters outside the loop instead of directly measuring with central-loop sounding. The characteristic of the outside-loop sounding configuration is that during high-precision sounding survey, this method can massively avoid the influence from the self-inductance of the transmitter loop compared to central-loop sounding, thus, can raise the resolution and the exploration depth of the survey. By comparative tests with central-loop sounding configuration and application to a sounding survey carried out in Turpan-Hami Basin, Xinjiang, we find that the method is effective and shall be put in use in future.


Wang B.,No 203 Research Institute Of Nuclear Industry | Li Q.,No 203 Research Institute Of Nuclear Industry
Yejin Fenxi/Metallurgical Analysis | Year: 2016

The step-by-step acid dissolution method was adopted. The sample was firstly dissolved with H2SO4-HClO4-HF; then, HNO3 was used as redissolution acid; finally, HCl(1+3) was used as medium acid. Fe 259.94 nm was selected as the analytical line. The content of total iron in uranium ore was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). When the mass concentration of iron was in range of 14-224 μg/mL, the linear correlation coefficient of calibration curve was r=0.9999. The detection limit of total iron was 1.25×10-4%. The proposed method was applied to the determination of total iron in six national certified reference materials of uranium ore, including GBW04117-GBW04122.The relative standard deviations (RSD, n=20) were between 1.2% and 3.6%, and the found results were consistent with the certified values. The content of total iron in ten actual uranium ore samples was also determined according to the experimental method, and the found results were consistent with those obtained by EJ/T 297.3-1987. The total iron in certified reference materials was determined according to the experimental method and EJ/T 297.3-1987. The determination results of two methods were compared. The F test and t rest indicated that the proposed method and EJ/T 297.3-1987 had no significant difference. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved.

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