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| 1 | Rare Earth Element Geochemistry of Late Palaeozoic Coals in North China显示文摘Instrumental Neutron Activation Analysis (INAA) was done to determine the abundances of rare earth elements (REE) of 58 samples of Late Palaeozoic Carboniferous-Permian coals and related rocks in North China. Detailed study of REE geochemistry shows that the ∑REE of most coals studied in this paper is in a normal range between 30×10-6 and 80×10-6 with a mean of 56×10-6. The REE in the Taiyuan Formation in the northern part of North China are much richer than those in the southern part. This is due to the shorter distance to the source area in the north. Moreover, the IREE is in positive correlation to coal ash, especially closely related to the content of clay minerals <2μm in size. This reveals that most REE were carried by terrigenous clastic materials, especially fine clay minerals. In the coals the light REE (LREE) are much richer than the heavy REE (HREE), and the LREE/HREE ratio in coals generally varies from 2 to 8. The LREE/HREE ratio of high-ash, low-sulphur coals is higher than that of | HUANG Wenhui YANG Qi TANG Dazhen TANG Xiuyi ZHAO Zhigen | 2000 | Acta Geologica Sinica(English Edition)2000，74，1： | 14 |
| 2 | Coal petrology and genesis of Jurassic coal in the Ordos Basin,China显示文摘简单结构和浅埋葬深度描绘的厚煤床的多重集合在 Ordos 盆的早、中间的侏罗记阶层被开发,西北的中国。这高质量的煤的巨大的储备有高商业的价值。我们学习了煤岩石学的特征和它的 maceral 分发到决定 macerals 贡献到油和气体的产生。结果证明因为主要是在上面的河的系统的一系列高看台的沼泽地的盆唯一的 depositional 环境,在 Ordos 盆的侏罗记煤有特殊 petrological 特征。这些 petrographic 特征是一些沙身体被移植河形成的典型内陆湖的发展的结果。在埋葬以后,泥炭继续经历氧化条件,产生广泛的更高的 inertinite 在煤满足的这个过程和 vitrinite 部件被改变到 semi-vitrinite。这些侏罗记煤的宏观的 petrographic 类型主要是半迟钝的煤,迟钝的煤, semilustrous 和有光泽的煤。半迟钝的煤和迟钝的煤的比例在盆边缘是更高的,特别在北边缘附近的区域。semilustrous 和有光泽的煤的数字向南并且向中央盆增加。这种状况显示不同形成煤的沼泽地环境让学生在煤部件上控制效果。另一观察是在 Ordos 煤序列,特别在更低的部分,一些沙岩床是厚的,直到有一种粗糙的谷物尺寸的 20 m。在 macerals 的更高的 fusinite 内容与更多的完全、常规的植物房间结构伴随一个更高的 semi-vitrinite 内容。fusinite 结构清楚、很好保存。在埋葬以后,房顶和地板岩石的岩性学能继续影响煤岩石学的进化。在房顶和地板的沙身体展出好物理条件以便毛孔水能维持氧化,循环和连接的一个长期的状态到煤。煤部件因此很长时间留在氧化环境。在盆中心,在埋葬和随后的煤床很快进入了减少的环境以后,相反地,开发的湖的外形和泥炭被 mudstone 很快盖住。作为结果,丰富的胶凝化作用发生了, vitrinite 内容增加了。Exinite 经常在煤床上在一个特定的位置积累了。尽管平均 exinite 内容不总体上高,它显著地确实贡献全部的烃产生。exinite 内容被低估了,特别非结晶的沥青的液体和它的重要性这里被强调。原因是液体容易流进有强壮的刚硬的 fusinite,或流进一些裂缝,在它通常被忽视的地方。 | Weihua Ao Wenhui Huang Chengmin Weng Xiuling Xiao Dameng Liu Xiuyi Tang Ping Chen Zhigen Zhao Huan Wan Robert B.Finkelman | 2012 | Geoscience Frontiers2012，3，1： | 3 |
| 3 | Geochemistry of Permian Coal and Its Combustion Residues in Huainan Coalfield, China显示文摘INAA (instrumental neutron activation analysis) was used to determine the contents of trace elements in coal samples from 11 workable Permian coal seams in Huainan coalfield. With XRFS (X-ray fluorescence spectrometry), the geochemical composition of its combustion residues from Tianjiaan Power Plant and Luohe Power Plant was analyzed. In addition, the electron microprobe was employed to study the chemical composition of some fly ashes and bottom ashes. Compared with those of the coals around the world, most trace elements of the Huainan coal are characterized by a normal abundance. Like most coals worldwide, the elements Se, S, As, Sb, Br, U and Cl are enriched in Huainan coal according to dark’s value, while the other elements tend to be diluted. The large fluctuation in the contents of trace elements in this kind of coal demonstrates great differences in coal seams. On the other hand, the contents of these elements are very similar in different bottom and fly ash samples. The elements with low organic affinity tend to concentrate in fly and bottom ash than in coal, especially those elements associated with Fe. However, the elements with strong organic affinity tend to be volatile during the combustion. Moreover, the abundance of the elements in fly ash and bottom ash changes with different densities and with different particle sizes. The bottom and fly ashes consist of glass, lime, mullite, coal residues and ferrite minerals. Some residual chars contain higher contents of volatile elements, such as S, P, Cl and As, indicating that the ash containing more residual chars has a strong adsorption of some hazardous elements, suggesting a possible utilization of power plant ash in the field of water cleaning. | Huang Wenhui Yang Qi Department of Energy Resources and Geology , China University of Geosciences , Beijing 100083 Peng Suping Department of Geology and Engineering, China University of Mining and Technology, Beijing 100083 Zhao Zhigen Department of R | 2001 | Journal of China University of Geosciences2001，12，4： | 2 |
| 4 | Thermal property characterization of a low melting-temperature ternary nitrate salt mixture for thermal energy storage systems 显示文摘 | ZHAO Changying WU Zhigen | 2011 | Solar Energy Materials and Solar Cells2011，95，12： | 1 |
| 5 | Heat transfer enhancement of high temperature thermal energy storage using metal foams and expanded graphite显示文摘 | Zhao Changying Wu Zhigen | 2011 | Solar Energy Materials & Solar Cells2011，95，2： | 1 |
| 6 | Creep properties and a creep equation of delay outburst coal and its adjacent mudstone显示文摘The study of the creep properties of coal and its adjacent mudstone is very important for understanding the mechanism of delay outburst coal. The samples of delay outburst coal and its adjacent mudstone collected from Yongshanqiao mine were used to carry out triaxial creep tests. The influence of confining pressure and axial compression on the creep test was analyzed. An accelerated creep model was constructed in parallel with a nonlinear viscous component and plastic component. It is connected with the traditional Burges creep model in series. A creep model which can describe the nonlinear viscoelastic-plastic creep model of rock was established and the corresponding creep equation was derived.According to the results of the creep test, the related parameters of the equation were fitted. The results show that, under the same confining pressure, instantaneous creep strain, creep strain of deceleration phase and constant rate creep of the coal and its adjacent mudstone are increased with an increase in the deviatoric stress. But at the same axial pressure, all of the above decrease with an increase of confining pressure. The duration time of the deceleration creep phase increases with the increase in the deviatoric stress. The theoretical values of the creep equation are in good agreement with the experimental results. It indicates that the creep properties of the delayed outburst coal and its adjacent mudstone can be well described by the creep model established in this paper. | Lu Haifeng Zhao Zhigen | 2016 | International Journal of Mining Science and Technology2016，26，6： | 0 |
| 7 | Identification and mapping of soybean and maize crops based on Sentinel-2 data显示文摘Soybean and maize are important raw materials for the production of food and livestock feed.Accurate mapping of these two crops is of great significance to crop management,yield estimation,and crop-damage control.In this study,two towns in Guoyang County,Anhui Province,China,were selected as the study area,and Sentinel-2 images were adopted to map the distributions of both crops in the 2019 growing season.The data obtained on August 18(early pod-setting stage of soybean)was determined to be the most applicable to soybean and maize mapping by means of the Jeffries-Matusita(JM)distance.Subsequently,three machine-learning algorithms,i.e.,random forest(RF),support vector machine(SVM)and back-propagation neural network(BPNN)were employed and their respective performance in crop identification was evaluated with the aid of 254 ground truth plots.It appeared that RF with a Kappa of 0.83 was superior to the other two methods.Furthermore,twenty candidate features containing the reflectance of ten spectral bands(spatial resolution at 10 m or 20 m)and ten remote-sensing indices were input into the RF algorithm to conduct an important assessment.Seven features were screened out and served as the optimum subset,the mapping results of which were assessed based on the ground truth derived from the unmanned aerial vehicle(UAV)images covering six ground samples.The optimum feature-subset achieved high-accuracy crop mapping,with a reduction of data volume by 65%compared with the total twenty features,which also overrode the performance of ten spectral bands.Therefore,feature-optimization had great potential in the identification of the two crops.Generally,the findings of this study can provide a valuable reference for mapping soybean and maize in areas with a fragmented landscape of farmland and complex planting structure. | Bao She Yuying Yang Zhigen Zhao Linsheng Huang Dong Liang Dongyan Zhang | 2020 | International Journal of Agricultural and Biological Engineering2020，13，6： | 0 |
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