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| 1 | Oxidative coupling of methane over BaCl_2-TiO_2-SnO_2 catalyst显示文摘The performance of BaCl2-TiO2-SnO2 composite catalysts in oxidative coupling of methane reaction has been investigated. A series of BaCl2-TiO2, BaCl2-SnO2, TiO2-SnO2, and BaCl2-TiO2-SnO2 catalysts were prepared, and characterized by BET, XRD, XPS, CO2-TPD and H2-TPR, respectively. The synergistic effect among BaCl2, SnO2 and TiO2 compositions enhances the catalytic performance. The best C2 selectivity and ethylene yield are obtained on the catalyst with the equal molar amount of the three compositions (BaCl2 : TiO2 : SnO2 molar ratio of 1 : 1 : 1). The optimal reaction conditions are as follows: 800°C, 44 mL·min-1 for methane, 22 mL·min-1 for oxygen and a space velocity of 5000 mL·h-1 g-1, and the C2H4 yield over the catalyst is 20.1% with the CH4 conversion of 43.8% and C2 selectivity of 53.3%. | Zhonglai Wang Guojun Zou Xu Luo Hua Liu Runxiong Gao Lingjun Chou Xiaolai Wang | 2012 | Journal of Natural Gas Chemistry2012，21，1： | 3 |
| 2 | 酒精依赖的基于基因和基于通路的全基因组关联研究(英文)显示文摘背景:信号通路中风险基因的构成可能可以解释酒精依赖风险基因协同的神经生物学作用。目的:识别酒精依赖的风险基因和风险基因通路。方法:我们采用基因富集(gene-set-rich)分析方法对酒精依赖进行了基于通路的全基因组关联分析(GWAS)。在包括1409名欧裔美国人(European-American,EA)酒精依赖者和1518名EA健康对照者的探索性样本人群中检测了近一百万个基因标志物。此外,将681名非裔美国人(African-American,AA)病例和508名AA健康受试者作为重测样本。结果:我们发现了几个与酒精依赖显著相关的可重复的全基因组风险基因和风险通路。在多重比较Bonferroni校正后,'细胞-细胞外基质相互作用'通路(EA样本中p<2.0E-4)和该通路中PXN基因(编码桩蛋白paxillin)(EA样本中p=3.9E-7)是最有可能的酒精依赖的危险因素。在EA样本(0.015≤p≤0.035)和AA样本(0.025≤p≤0.050)中还有两条富含酒精依赖相关基因的可重复的通路:'Na+/Cl-依赖性神经递质转运体'通路和'其他聚糖降解'通路。结论:一些基因和生物信号传导过程可能与酒精依赖的风险相关,本研究的发现为此提供了新的证据。 | Lingjun ZUO Clarence K.ZHANG Frederick G.SAYWARD Kei-Hoi CHEUNG Kesheng WANG John H.KRYSTAL Hongyu ZHAO Xingguang LUO | 2015 | 上海精神医学2015，27，2： | 1 |
| 3 | Investigation of the impact of hydrodynamic conditions on sediment resuspension in shallow lakes显示文摘In this study,we sampled the original sediment columns from three points located in the eastern,central,and western areas of Chaohu Lake,and then investigated sediment resuspension under hydraulic disturbances in the laboratory. The results showed that when the hydraulic disturbance is weak and sediment surface shear stress is small (<0.02 N/m²),sediment surface layer moves alone. When the hydraulic disturbance is moderate and sediment surface shear stress is within a threshold (3.7 N/m²),only a small proportion of the surface sediments begins to move. However,when the hydraulic disturbance is further strengthened and sediment surface shear stress is larger than the threshold value,surface sediments move smoothly. By the experimental results,we found that the plankton layer is about 1 mm (1.56% of the maximum content of suspended matter (SSCmax)),which is the major contribution of individual sediment initiation. The new sediment layer is about 19–22 mm (20.9% of the SSCmax),which considerably affects sediment resuspension in shallow lakes. The consolidated layer is about 22 mm below the bed surface,which requires high shear stress and is hard to be transferred to the water column. The quantified experimental observation results are further verified with the theoretical results. | Wenguang Luo Jing Lu Senlin Zhu Yao Yue Lingjun Xiao | 2022 | International Journal of Digital Earth2022，15，1： | 0 |
| 4 | Environmental Effects of Foreign Trade and Its Spatial Variations in Mid-eastern Provinces and Cities of China显示文摘The studies on environmental effects of foreign trade and its spatial variations are helpful to design and implement environmental protection countermeasures.In order to eliminate the adverse effects of insufficient observation values on the accuracy of regression results and dynamic information quantity of fitting equation during empirical study,panel data of the mid-eastern provinces and cities of China from 1985 to 2007 were selected based on the adjustment of classical regression model in this paper.Panel unit root test and panel cointegration analysis method were applied to investigating the environmental effects of foreign trade and its spatial variations in the mid-eastern provinces and cities of China and its three groups divided by foreign trade dependence.The results show that all scale effects are positive,while all technical effects are negative and unable to counteract positive scale effects.Foreign trade development is regarded as an important cause for outstanding eco-environmental problems in the mid-eastern provinces and cities of China.Total effects and structural effects are significantly different among different groups because of spatial variations in environmental policies,export destinations,source of FDI,etc.Following the principle of′coordinating generality and considering differences comprehensively′,it is essential to issue a series of policies and countermeasures corresponding to differences in regional environmental effect of foreign trade,in order to coordinate the relationship between foreign trade development and eco-environment in each region. | JIN Xianfeng DONG Suocheng LUO Lingjun LI Yu YUAN Chao SHU Kesheng CHEN Jiaquan | 2012 | Chinese Geographical Science2012，22，5： | 0 |
| 5 | Integrated data-model-knowledge representation for natural resource entities显示文摘The unified management and planning of national or provincial natural resources distributed both aboveground and underground have become increasingly important.Accurate depictions of natural resource elements and their interactions are key to achieving integrated and systematic management of natural resources.However,current spatiotemporal data models are based only on data descriptions,attribute records,and other model knowledge of a more general basis,without intuitively describing relationships between these elements and natural resources.This paper,therefore,proposes an integrated data-model-knowledge representation model to explicitly describe the time,space,and interaction of natural resource entities through an integrated knowledge graph.First,this study constructs a conceptual model using the aspects of semantics,scale,and data-model-knowledge,thereby explicitly describing the relationships of natural resources.Second,a logical model of natural resource representation is proposed,that is integrated with time,space,attributes,and relationships.Finally,taking the management of water resources as an example,this paper realizes the meticulous presentation of the levels of detail and rich semantic relations of natural resource entities.The findings of this study lay the foundation for a more efficient,precise,and lucid perception of the distribution laws and complicated interactional relationships of natural resources,both aboveground and underground. | Yulin Ding Zhaowen Xu Qing Zhu Hankan Li Yan Luo Ying Bao Lingjun Tang Sen Zeng | 2022 | International Journal of Digital Earth2022，15，1： | 0 |
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