|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Rate of strong consistency of quasi maximum likelihood estimate in generalized linear models显示文摘 | YUE Li & CHEN Xiru School of Mathematics and Statistics, Wuhan University, Wuhan 430072, China Graduate School, Chinese Academy of Sciences, Beijing 100039, China | 2004 | Science China Mathematics2004，47，6： | 25 |
| 2 | The concept of effective emissivity of nonisothermal mixed pixel and its test显示文摘Based on two preconditions, the local thermal equilibrium is satisfied and emissivities donot change with temperature, the concept of component effective emissivity of nonisothermal mixed pixel has been put forward and then the radiant directionality model of nonisothermal mixed pixel constructed from it. Our study shows that the component effective emissivity is associated with geometric structure, optical properties of target, and viewing angle, but does not depend on the component temepratures. The component temperatures can only change the ratio of component radiance to the total radiance of the mixed-pixel. The total effective emissivity of this pixel is the complement of its directional-hemisphere reflectance. After the simulation of component effective emissivity of the discrete cones and continuous vegetation canopy (winter wheat) by the Monte Carlo method, our model of radiant directionality of nonisothermal mixed pixel have been proved by lab and field measurements. | CHEN Liangfu ZHUANG Jiali XU Xiru NIU Zheng ZHANG Renhua XIANG Yueqing | 2000 | Chinese Science Bulletin2000，45，9： | 17 |
| 3 | Adaptive quasi-likelihood estimate in generalized linear models显示文摘This paper gives a thorough theoretical treatment on the adaptive quasilikelihood estimate of the parameters in the generalized linear models. The unknown covariance matrix of the response variable is estimated by the sample. It is shown that the adaptive estimator defined in this paper is asymptotically most efficient in the sense that it is asymptotic normal, and the covariance matrix of the limit distribution coincides with the one for the quasi-likelihood estimator for the case that the covariance matrix of the response variable is completely known. | CHEN Xia & CHEN Xiru School of Mathematics and Statistics, Wuhan University, Wuhan 430072, China Graduate School, Chinese Academy of Science, Beijing 100049, China | 2005 | Science China Mathematics2005，48，6： | 13 |
| 4 | The spatial scaling effect of continuous canopy Leaves Area Index retrieved by remote sensing显示文摘Leave Area Index (LAI) is one of the most basic parameters to describe the geometric structure of plant canopies. It is also important input data for climatic model and interaction model between Earth surface and atmosphere, and some other things. The spatial scaling of retrieved LAI has been widely studied in recent years. Based on the new canopy reflectance model, the mechanism of the scaling effect of con- tinuous canopy Leaf Area Index is studied, and the scaling transform formula among different scales is found. Both the numerical simulation and the field validation show that the scale transform formula is reliable. | XU XiRu FAN WenJie TAO Xin | 2009 | Science China Earth Sciences2009，52，3： | 12 |
| 5 | Crop area and leaf area index simultaneous retrieval based on spatial scaling transformation显示文摘Accurate estimation of crop yields is crucial for ensuring food security. However, crops are distributed so fragmentally in China that mixed pixels account for a large proportion in moderate and coarse resolution remote sensing images. As a result, unmixing of mixed pixel becomes a major problem to estimate crop yield by means of remote sensing method. Aimed at mixed pixels, we developed a new method to introduce additional information contained in the spatial scaling transformation equation to the canopy reflectance model. The crop area and LAI can be retrieved simultaneously. On the basis of a precise and simple canopy reflectance model, directional second derivative method was chosen to retrieve LAI from optimal bands of hyper-spectral data; this method can reduce the impact of the canopy non-isotropic features and soil background. To evaluate the performance of the method, Yingke Oasis, Zhangye City, Gansu Province, was chosen as the validation area. This area was covered mainly by maize and wheat. A Hyperion/EO-1 image with the 30 m spatial resolution was acquired on July 15, 2008. Images of 180 m and 1080 m resolutions were generated by linearly interpolating the original Hyperion image to coarser resolutions. Then a multi-scale image serial was obtained. Using the proposed method, we calculated crop area and the average LAI of every 1080 m pixel. A SPOT-5 classification figure serves as the validation data of crop area proportion. Results show that the pattern of crop distribution accords with the classification figure. The errors are restrained mainly to -0.1-0.1, and approximate a Normal Distribution. Meanwhile, 85 LAI values obtained using LAI-2000 Plant Canopy Analyzer, equipped with GPS, were taken as the ground reference. Results show that the standard deviation of the errors is 0.340. The method proposed in the paper is reliable. | Fan WenJie Yan BinYan Xu XiRu | 2010 | Science China Earth Sciences2010，53，11： | 6 |
| 6 | Treatment patterns for adjuvant docetaxel-based chemotherapy in early-stage breast cancer in China:A pooled retrospective analysis of four observational studies显示文摘Objective:Adjuvant docetaxel-based chemotherapy is frequently used for operable early breast cancer(EBC).This study investigated patterns of use of docetaxel(T)in real-life clinical practice in China.Methods:This was a retrospective pooled analysis of the Asia-Pacific Breast Initiatives(APBI)Ⅰ(2006–2008)and Ⅱ(2009–2011)registries,and two Chinese observational studies;BC STATE(2011–2014)and BC Local Registry(2007–2010).Female Chinese adults(≥18 years)with operable breast cancer treated with docetaxel-based adjuvant chemotherapy were included in the analysis.Patients with metastatic disease were excluded.The primary endpoint was assessment of treatment patterns and patient profiles.A logistic regression analysis was conducted to identify factors associated with choice of adjuvant chemotherapy regimen.Results:Data from 3,020 patients were included.The most frequently used adjuvant regimen was docetaxel/anthracycline combination[n=1,421(47.1%);of whom 52.0%received T/epirubicin(E)/cyclophosphamide(C)],followed by docetaxel/other[n=705(23.3%);of whom 72.8%received TC],docetaxel/anthracycline sequential[n=447(14.8%);of whom 40.9%and 39.6%received 5-Fu/EC-T and EC-T,respectively],and'other'[n=447(14.8%);of whom 91.5%received T].A significant association was found between adjuvant therapy with docetaxel/anthracycline combination and patient weight,menopausal status and estrogen receptor status.Conclusions:Real-world data revealed that docetaxel/anthracycline combination is the most commonly used category of docetaxel-based adjuvant therapy for patients with operable breast cancer in China;of which TEC is the most frequently used regimen. | Binghe Xu Zhimin Shao Shui Wang Zefei Jiang Xichun Hu Xiaohua Zhang Xiru Li Jinping Liu Mengquan Li Shu Wang | 2018 | Chinese Journal of Cancer Research2018，30，3： | 5 |
| 7 | EXISTENCE OF CONSISTENT ESTIMATES OF LINEAR REGRESSION COEFFICIENTS WHEN THE ERROR VARIANCES ARE UNEQUAL显示文摘Consider the linear regression model Yi=xi′β+σiei,i=1,…,n,…,where E(ei)=0,E(eiej)=δij,0<σ12(?)σ22(?)…and {xi} satisfies A1(?)sum from i=1 to n xixi′/n(?)A2,for n large,A1>0,A2>0.This paper shows that (i) ifσi2,i=1,2…,are known,then the necessary and sufficient condition for theconsistency of the best unbiased linear estimate of β is sum from i=1 to ∞σi-2=∞;(ii)if{σi2}is only known to belong to the set {(h1,h2,…)∶0<h1(?)h2(?)…,sum from i=1 to ∞ hi-1=∞},then no mean-square consistent linear estimate of β exists,and,if e1,e2,…are independent and satisfy a minor condition,then no weakly consistent linearestimate of β exists.Some related open problems are suggested. | JIN Mingzhong (Institute of Systems Science,Academia Sinica,Beijing 100080,China)CHEN Xiru (Graduate School,University of Science and Technology of China,Beijing 100239,China) | 1992 | Systems Science and Mathematical Sciences1992，5，3： | 4 |
| 8 | The spatial scaling effect of the discrete-canopy effective leaf area index retrieved by remote sensing显示文摘The leaf area index(LAI) is a critical biophysical variable that describes canopy geometric structures and growth conditions.It is also an important input parameter for climate,energy and carbon cycle models.The scaling effect of the LAI has always been of concern.Considering the effects of the clumping indices on the BRDF models of discrete canopies,an effective LAI is defined.The effective LAI has the same function of describing the leaf density as does the traditional LAI.Therefore,our study was based on the effective LAI.The spatial scaling effect of discrete canopies significantly differed from that of continuous canopies.Based on the directional second-derivative method of effective LAI retrieval,the mechanism responsible for the spatial scaling effect of the discrete-canopy LAI is discussed and a scaling transformation formula for the effective LAI is suggested in this paper.Theoretical analysis shows that the mean values of effective LAIs retrieved from high-resolution pixels were always equal to or larger than the effective LAIs retrieved from corresponding coarse-resolution pixels.Both the conclusions and the scaling transformation formula were validated with airborne hyperspectral remote sensing imagery obtained in Huailai County,Zhangjiakou,Hebei Province,China.The scaling transformation formula agreed well with the effective LAI retrieved from hyperspectral remote sensing imagery. | FAN WenJie GAI YingYing XU XiRu YAN BinYan | 2013 | Science China Earth Sciences2013，56，9： | 4 |
| 9 | A method for blind separation of components information from mixed pixel显示文摘在遥感的地里,把部件信息与混合象素分开是重要的。如果遥感的物理过程能被一套线性方程表示,遥感信息矩阵等于部件信息矩阵乘的重量矩阵。一般来说,部件信息矩阵的检索的前提是重量矩阵被知道。然而,盲目信号分离(BSS ) 方法能无条件地分开矩阵,其基本原则是需要分离的添加剂信息能从统计特征被完成,在遥远地察觉到的信息矩阵在样品的一个团中包含了。因此,部件信息矩阵的价值和重量矩阵能被估计。波浪形状 f 部件能被 BSS,而是振幅检索不能。在这篇论文,混合象素被选择为学习的植物土壤在这论文 t 份量上指向分开部件信息并且解决 BSS 的不确定性。模拟和地测试验证方法的可靠性。结果证明 BSS 能是在很答应的申请的混合象素分离,和前景的有效方法之一* | FAN Wenjie XU Xiru | 2006 | Progress in Natural Science:Materials International2006，16，7： | 3 |
| 10 | Microstructures and mechanical properties of a newly developed high-pressure die casting Mg-Zn-RE alloy显示文摘A newly developed Mg-4Zn-2La-3Y alloy with high strength was fabricated by high-pressure die casting method,and its microstructures were thoroughly studied using transmission electron microscopy.The results demonstrate that it owns fine grains and approximately highly interconnected intermetallic phase skeletons,and exhibits ultra-high strength at both room and high temperatures.Interestingly,the eutectic intermetallic skeleton of this alloys is consisted of numerous fine particles,which are mainly consisted of two intermetallic phases,namely W and Mg12RE.Multiple{101}twins and SFs were found in the Mg12RE phase while a few of SFs in the W phase.Additionally,minor long-period stacking ordered phase was observed in the eutectoid phase,and it probably nucleated on the Mg12RE phase following a certain OR as(0002)14H//(110)Mg12REand[1120]14H//[111]Mg12RE,or(0002)14H//(211)Mg12REand[1120]14H//[111]Mg12RE.This special intermetallic skeleton with many interfaces and planar faults can efficiently transfer dislocations across grain boundaries,and this is the key factor for the outstanding mechanical properties of the studied alloy. | Xiru Hua Qiang Yang Dongdong Zhang Fanzhi Meng Chong Chen Zihao You Jinghuai Zhang Shuhui Lv Jian Meng | 2020 | Journal of Materials Science & Technology2020，52，18： | 3 |
| 11 | A unified model of bidirectional reflectance distribution function for the vegetation canopy显示文摘An accurate and operational bidirectional reflectance distribution function(BDRF) canopy model is the basis of quantitative vegetation remote sensing.The canopy reflectance should be approximated as the sum of the single scattering reflectance arising from the sun,ρ~1,and the multiple scattering reflectance arising from the canopy,ρ~m,as their directional characteristics are dramatically different.Based on the existing BRDF model,we obtain a new analytical expression of ρ~1 and ρ~m in this paper,which is suitable for different illumination conditions and different vegetation canopies.According to the geometrical optic model at the leaf scale,the anisotropy of ρ~1 can be ascribed to the geometry of the object,sun and the sensor,multiple scale clumping,and the fraction of direct solar radiation and diffuse sky radiation.Then,we parameterize the area ratios of four components:the sunlit foliage,sunlit ground,shadow foliage and shadow ground based on a Poisson distribution,and develop a new approximate analytical single scattering reflectance model.Assuming G=0.5,a recollision probability theory based scattering model is developed which considers the effects of diffuse sky radiation,scattering inside the canopy and rebounds between the canopy and soil.Validation using ground measurements of maize and black spruce forest proves the reliability of the model. | XU XiRu FAN WenJie LI JuCai ZHAO Peng CHEN GaoXing | 2017 | Science China Earth Sciences2017，60，3： | 3 |
| 12 | A unified canopy bidirectional reflectance (BRDF) model for row ceops显示文摘Row sowing is a basic crop sowing method in China,and thus an accurate Bidirectional Reflectance Distribution Function (BRDF) model of row crops is the foundation for describing the canopy bidirectional reflectance characteristics and estimating crop ecological parameters.Because of the macroscopically geometric difference,the row crop is usually regarded as a transition between continuous and discrete vegetation in previous studies.Were row treated as the unit for calculating the four components in the Geometric Optical model (GO model),the formula would be too complex and difficult to retrieve.This study focuses on the microscopic structure of row crops.Regarding the row crop as a result of leaves clumped at canopy scale,we apply clumping index to link continuous vegetation and row crops.Meanwhile,the formula of clumping index is deduced theoretically.Then taking leaf as the basic unit,we calculate the four components of the GO model and develop a BRDF model for continuous vegetation,which is gradually extended to the unified BRDF model for row crops.It is of great importance to introduce clumping index into BRDF model.In order to evaluate the performance of the unified BRDF model,the canopy BRDF data collected in field experiment,'Watershed Allied Telemetry Experiment Research (WATER)',from May 30th to July 1st,2008 are used as the validation dataset for the simulated values.The results show that the unified model proposed in this paper is able to accurately describe the non-isotropic characteristics of canopy reflectance for row crops.In addition,the model is simple and easy to retrieve.In general,there is no irreconcilable conflict between continuous and discrete vegetation,so understanding their common and individual characteristics is advantageous for simulating canopy BRDF.It is proven that the four components of the GO model is the basic motivational factor for bidirectional reflectance of all vegetation types. | YAN BinYan XU XiRu FAN WenJie | 2012 | Science China Earth Sciences2012，55，5： | 3 |
| 13 | Postzygotic single-nucleotide mosaicisms in whole-genome sequences of clinically unremarkable individuals显示文摘 | August Y Huang Xiaojing Xu Adam Y Ye Qixi Wu Linlin Yan Boxun Zhao Xiaoxu Yang Yao He Sheng Wang Zheng Zhang Bowen Gu Han-Qing Zhao Meng Wang Hua Gao Ge Gao Zhichao Zhang Xiaoling Yang Xiru Wu Yuehua Zhang Liping Wei | 2014 | Cell Research2014，24，11： | 2 |
| 14 | Validation methods of LAI products on the basis of scaling effect显示文摘Validation is one of the most important processes used to evaluate whether remotely sensed products can accurately reflect land surface configuration. Leaf Area Index( LAI) is a key parameter that represents vegetation canopy structures and growth conditions. Accurate evaluation of LAI products is the basis for applying them to land surface models. In this study,validation methods of coarse resolution MODIS and GLASS LAI products for heterogeneous pixels are established on the basis of the scaling effect and the scaling transformation. Considering spatial heterogeneity and growth difference,we transformed LAI from field measurements into a 1 km resolution scale with the aid of middle resolution images. We used average LAI and apparent LAI separately to validate the algorithms and products of MODIS and GLASS LAI. Two study areas,Hebi City and the Yingke Oasis,were selected for validation. Both MODIS and GLASS LAI products underestimate the true LAI in crop area. However,this result cannot be completely attributed to their algorithms. Instead,the primary reason is the heterogeneity and nonuniformity of the coarse pixels.Underestimation is evident in the Yingke Oasis,where heterogeneity is significant. Given that GLASS LAI product is the fusion of multiple LAI products,the mean value of this product is closer to the real situation,but the dynamic range is narrower than that of MODIS LAI product. | LIAO Yanran GAI Yingying YAO Yanjuan FAN Wenjie XU Xiru YAN Binyan | 2015 | 遥感学报2015，19，1： | 2 |
| 15 | The C_(6)D_(6)detector system on the Back-n beam line of CSNS显示文摘Introduction The neutron capture cross sections are very important in the field of nuclear device design and basic physics research.Hydrogen-free liquid scintillator such as C_(6)D_(6)detectors are widely used in the neutron capture cross-sectional measurements for the low neutron sensitivity and fast time response.The Back-n white neutron source at China Spallation Neutron Source is the first spallation white neutron source in China,and it is suitable for neutron capture cross-sectional measurement.Materials and methods A C_(6)D_(6)detector system was built in the Back-n experimental station.The pulse height weighting technique was used to determine the system’s detection efficiency.The response to gamma rays of the C_(6)D_(6)detector was measured,and the energy resolution function was determined.Monte Carlo simulation with Geant4 code was carried out to get the weighting function of this C_(6)D_(6)detector system.Additionally,the systematic uncertainty of the weighting function was also determined.Conclusion According to the experimental and simulation results,this C_(6)D_(6)detector system can be used to measure neutron capture cross section. | Jie Ren Xichao Ruan Jie Bao Guangyuan Luan Wei Jiang Qi An Huaiyong Bai Ping Cao Qiping Chen Yonghao Chen Pinjing Cheng Zengqi Cui Ruirui Fan Changqing Feng Minhao Gu Fengqin Guo Changcai Han Zijie Han Guozhu He Yongcheng He Yuefeng He Hanxiong Huang Weiling Huang Xiru Huang Xiaolu Ji Xuyang Ji Haoyu Jiang Hantao Jing Ling Kang Mingtao Kang Bo Li Lun Li Qiang Li Xiao Li Yang Li Yang Li Rong Liu Shubin Liu Xingyan Liu Yinglin Ma Changjun Ning Binbin Qi Zhaohui Song Hong Sun Xiaoyang Sun Zhijia Sun Zhixin Tan Hongqing Tang Jingyu Tang Pengcheng Wang Qi Wang Taofeng Wang Yanfeng Wang Zhaohui Wang Zheng Wang Jie Wen Zhongwei Wen Qingbiao Wu Xiaoguang Wu Xuan Wu Likun Xie Yiwei Yang Han Yi Li Yu Tao Yu Yongji Yu Guohui Zhang Jing Zhang Linhao Zhang Liying Zhang Qingmin Zhang Qiwei Zhang Xianpeng Zhang Yuliang Zhang Zhiyong Zhang Yingtan Zhao Liang Zhou Zuying Zhou Danyang Zhu Kejun Zhu Peng Zhu | 2019 | Radiation Detection Technology and Methods2019，3，3： | 1 |
| 16 | High cycle fatigue failure with radial cracks in gears of aero-engines显示文摘The gears in aero-engines perform energy and motion transfer between the HighPressure Rotor(HPR)and accessories.Firstly,an occurred fault with radial cracks in the driven gear disk was diagnosed as High Cycle Fatigue(HCF)failure through necessary examinations.Analysis of fault tree and test signals indicated that the fracture was relevant to the swing vibration of the driven gear excited by the unbalance excitation on HPR.Secondly,a corresponding mechanism model was established,in which the gear meshing effect was considered,with lateral and swing vibration mode.The Governing Equations(GEs)and the Finite Element Model(FEM)were established and verified.Then,the modal shapes,harmonic response,and transient response were analyzed,indicating that the swing vibration of the driven gear could be significantly excited by the unbalance on HPR,which induced the cracks in the driven gear disk to extend radially.Furthermore,influences of factors on the unbalance response were obtained,in which the unbalance response appeared local minimum points and maximum points.Meanwhile,1#and 2#bearing stiffness had rather significant influences on the response.Thus it is efficient to modify them to achieve vibration control. | Jie HONG Liming JIANG Xiru XU Yanhong MA | 2020 | Chinese Journal of Aeronautics2020，33，10： | 1 |
| 17 | Simultaneous determination of 18 effective components in chemical medicines for cold with HPLC-MS/MS显示文摘 | Zhang Xiru Zhang Yihua Jiang Jianguo | 2013 | Asian J Chem2013，25，5： | 1 |
| 18 | Synchronous retrieval of land surface temperature and emissivity显示文摘 | Liu Qinhuo Chen Jiayi | 1998 | Science in China Series D1998，41，6： | 1 |
| 19 | Inference in a Simple Change-point Model显示文摘 | Chen Xiru | 1988 | Science in China:Ser A1988，31，： | 1 |
| 20 | SCN1A, SCN1B, and GABRG2 gene mutation analysis in Chinese families with generalized epilepsy with febrile seizures plus显示文摘 | Huihui Sun Yuehua Zhang Jianmin Liang Xiaoyan Liu Xiuwei Ma Husheng Wu Keming Xu Jiong Qin Yu Qi Xiru Wu | 2008 | Journal of Human Genetics2008，，8： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员