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| 1 | Empirical likelihood confidence regions of the parameters in a partially linear single-index model显示文摘In this paper, a partially linear single-index model is investigated, and three empirical log-likelihood ratio statistics for the unknown parameters in the model are suggested. It is proved that the proposed statistics are asymptotically standard chi-square under some suitable conditions, and hence can be used to construct the confidence regions of the parameters. Our methods can also deal with the confidence region construction for the index in the pure single-index model. A simulation study indicates that, in terms of coverage probabilities and average areas of the confidence regions, the proposed methods perform better than the least-squares method. | XUE Liugen~1 & ZHU Lixing~2 1. College of Applied Sciences,Beijing University of Technology,Beijing 100022,China 2. Department of Mathematics,Hong Kong Baptist University,Hong Kong,China | 2005 | Science China Mathematics2005，48，10： | 13 |
| 2 | Empirical likelihood-based inference in a partially linear model for longitudinal data显示文摘A partially linear model with longitudinal data is considered, empirical likelihood to infer- ence for the regression coefficients and the baseline function is investigated, the empirical log-likelihood ratios is proven to be asymptotically chi-squared, and the corresponding confidence regions for the pa- rameters of interest are then constructed. Also by the empirical likelihood ratio functions, we can obtain the maximum empirical likelihood estimates of the regression coefficients and the baseline function, and prove the asymptotic normality. The numerical results are conducted to compare the performance of the empirical likelihood and the normal approximation-based method, and a real example is analysed. | XUE LiuGen~(1+) & ZHU LiXing~2 1 College of Applied Sciences, Beijing University of Technology, Beijing 100022, China 2 Department of Mathematics, Hong Kong Baptist University, Hong Kong, China | 2008 | Science China Mathematics2008，51，1： | 9 |
| 3 | Plant food sources and stone tools' function at the site of Shunshanji based on starch grain analysis显示文摘The upper-middle Huai River valley(HRV) is located in the transition zone in the middle of eastern China. Previous studies have shown that the past populations in the upper HRV obtained plant food through gathering and cultivation of both rice and millet during the middle Neolithic. However, for the middle HRV it is not very clear what methods were used by humans to obtain plant food in that time. In this paper, starch grain analysis was carried out on 17 stone tools and 29 cauldron pottery sherds unearthed at Shunshanji(8.5–7.0 kyr BP), which is known as the earliest Neolithic site in the middle HRV excavated so far. Here, ancient starches from Coix lacryma-jobi, Triticeae, Oryza sativa, Trichosanthes kirilowii and one unidentified specie were recovered. This study contributes to the limited knowledge of food strategies as observed in the middle HRV. It demonstrates that both gathering and cultivation of rice took place during the middle-Neolithic. Among the identified species, Coix lacryma-jobi appears to have been the main plant food at Shunshanji. Moreover, it is clear that Oryza sativa was not consumed as much as other plant species according to the occurrence frequency of different starch grains. Starch grains were also found on the used surfaces of grinding stone implements as well as pestles, which means that these stone tools were used for food processing. In addition, axes from Shunshanji may also have been used for food processing as well as wood working because starches were also found on the edge of axes. Information about subsistence strategies and tool use at Shunshanji will also be helpful to understanding the utilization of plants and agricultural development in the middle HRV during the early-middle Neolithic period. | YANG YuZhang LI WeiYa YAO Ling CHENG ZhiJie LUO WuHong ZHANG JuZhong LIN LiuGen GAN HuiYuan YAN Long | 2016 | Science China Earth Sciences2016，59，8： | 9 |
| 4 | Characteristics of leaching of heavy metals from low-sulfur coal gangue under different conditions显示文摘Coal gangue is the main pollution source of mining areas.When coal gangue is stacked and recycled,the heavy metal elements contained in it are released by natural weathering and leaching,which causes damage to the surrounding ecological environment.In this study,the leaching and precipitation characteristics of heavy metals in low-sulfur coal gangue under different environmental conditions were simulated by indoor dynamic leaching experiments,which provided a theoretical basis for environmental restoration of the mining area.The conclusions are as follows:higher heavy metal content in low-sulfur coal gangue is associated with greater,leaching of heavy metals;acidic conditions promote the release of heavy metals in low-sulfur coal gangue;and more precipitation is associated with better release of heavy metals from the low-sulfur coal gangue. | Chang Li Liugen Zheng Chunlu Jiang Xing Chen Shuaishuai Ding | 2021 | International Journal of Coal Science & Technology2021，8，4： | 6 |
| 5 | Progress in TILLING as a tool for functional genomics and improvement of crops显示文摘Food security is a global concern and substantial yield increases in crops are required to feed the growing world population. Mutagenesis is an important tool in crop improvement and is free of the regulatory restrictions imposed on genetically modified organisms. Targeting Induced Local Lesions in Genomes(TILLING), which combines traditional chemical mutagenesis with high‐throughput genome‐wide screening for point mutations in desired genes, offers a powerful way to create novel mutant alleles for both functional genomics and improvement of crops. TILLING is generally applicable to genomes whether small or large, diploid or evenallohexaploid, and shows great potential to address the major challenge of linking sequence information to the function of genes and to modulate key traits for plant breeding. TILLING has been successfully applied in many crop species and recent progress in TILLING is summarized below, especially on the developments in mutation detection technology, application of TILLING in gene functional studies and crop breeding. The potential of TILLING/EcoTILLING for functional genetics and crop improvement is also discussed. Furthermore, a small‐scale forward strategy including backcross and selfing was conducted to release the potential mutant phenotypes masked in M2(or M3) plants. | Liang Chen Liugen Hao Martin A. J. Parry Andrew L. Phillips Yin-Gang Hu | 2014 | Journal of Integrative Plant Biology2014，56，5： | 3 |
| 6 | Empirical likelihood for single-index models with responses missing at random显示文摘The missing response problem in single-index models is studied, and a bias-correction method to infer the index coefficients is developed. Two weighted empirical log-likelihood ratios with asymptotic chisquare are derived, and the corresponding empirical likelihood confidence regions for the index coefficients are constructed. In addition, the estimators of the index coefficients and the link function are defined, and their asymptotic normalities are proved. A simulation study is conducted to compare the empirical likelihood and the normal approximation based method in terms of coverage probabilities and average lengths of confidence intervals. A real example illustrates our methods. | XUE LiuGen LIAN Heng | 2016 | Science China Mathematics2016，59，6： | 2 |
| 7 | Variable selection for single-index varying-coefficient model显示文摘 | Sanying FENG Liugen XUE | 2013 | Frontiers of Mathematics in China2013，8，3： | 2 |
| 8 | Significant Mercury Isotope Anomalies in Hydrothermal Altered Coals from the Huaibei Coalfield,China显示文摘Objective Igneous intrusion into coal-bearing strata can cause an abrupt increase of temperature-pressure and trigger hydrothermal circulation at the igneous rock-coal contact zone.The conductive heat of intruded magma and convective migration of secondary hydrothermal fluids have been observed to significantly alter | ZHENG Liugen SUN Ruoyu | 2016 | Acta Geologica Sinica(English Edition)2016，90，6： | 2 |
| 9 | The distribution, occurrence and environmental effect of mercury in Chinese coals 显示文摘 | ZHENG Liugen LIU Guijian CHOU Chenlin | 2007 | Sci Total Environ2007，384，123： | 1 |
| 10 | Empirical likelihood semiparametric regression analysis for longitudinal data显示文摘 | XUE Liugen ZHU Lixing | 2007 | Biometrika2007，94，： | 1 |
| 11 | Variable selection for partially linear models with randomly censored data显示文摘 | YANG Yiping XUE Liugen CHENG Weihu | 2010 | Communications in Statistics-Simulation and Computation2010，39，： | 1 |
| 12 | Instrumental variable-based empirical likelihood inferences for varying-coefficient models with er-ror-prone covariates 显示文摘 | ZHAO Peixin XUE Liugen | 2013 | Journal of Applied Statistics2013，40，： | 1 |
| 13 | Distribution and mode of occurrence of As, Hg and Se and sulfur in coal seam 3 of the Shanxi Formation,Yanzhon Coalfield, China显示文摘 | Liu Guijian Zheng Liugen Zhang Ying | 2007 | International Journal of Coal Geology2007，71，23： | 1 |
| 14 | Profile inference on partially linear varying-coefficient errors-in-variables models under restricted condition 显示文摘 | ZHANG Weiwei LI Gaorong XUE Liugen | 2011 | Computational Statistics & Data Analysis2011，55，： | 1 |
| 15 | Refinement Role of Electromagnetic Stirring and Calcium in AZ91 Magnesium Alloy显示文摘钙增加的效果并且电磁在 AZ91 的微观结构上激动人心镁合金和精炼机制被调查。结果证明从 0.1wt%到 0.3 wt% 的钙增加不导致任何新阶段的形成,但是引起裁判员 i 当演员组微观结构的 nement。然而,联合了钙 alloying 并且电磁激动人心显著地减少谷物尺寸,改变 β-Mg 17 艾尔 12 阶段,和还原剂他们的体积百分比。AZ91 合金的最小的谷物尺寸与 100 V 的令人激动的电压在 0.2 wt%Ca 的增加的情况中被获得。微结构裁判员 i nement 被归因于度的增加在根据 DTA 冷却和主要 α-Mg 阶段的成核温度下面,分析结果。 | HAN Hui LIU Shengfa KANG Liugen LIU Linyan | 2008 | Journal of Wuhan University of Technology(Materials Science)2008，23，2： | 1 |
| 16 | Design and implementation of a virtual information system for agile manufacturing显示文摘 | LIUGEN SONG RAKESH NAGI | 1997 | IIE Transactions1997，，10： | 1 |
| 17 | Variable selection for semiparametric varying coefficient partially linear error - in - variables models 显示文摘 | Zhao Peixin Xue Liugen | 2010 | Journal of Multivariate Analysis2010，101，： | 1 |
| 18 | Variable selection for varying coefficient models with measurement errors 显示文摘 | Zhao Peixin Xue Liugen | 2011 | Metrika2011，74，： | 1 |
| 19 | Empirical likelihood for linear models with missing responses显示文摘 | XUE Liugen | | 0，，06： | 1 |
| 20 | Geochemistry of rare earth elements in Permian coals from the Huaibei Coalfield, China显示文摘 | Liugen Zheng Guijian Liu ChenLiu Chou | 2007 | Journal of Asian Earth Science2007，31，： | 1 |
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