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| 1 | Pyrolysis characteristics of a North Korean oil shale显示文摘Pyrolysis characteristics of a North Korean oil shale and its pyrolysates were investigated in this paper. The pyrolysis experiments were conducted below 600 °C at a heating rate of 10, 15, 20 and 25 °C/min, respectively. The kinetics data were calculated using both integral and differential methods with the assumption of first order kinetics. The results show that the averaged oil content of the North Korean oil shale is about 12.1 wt% and its heat value is 13,400 kJ/kg. The oil yields at different retorting temperatures show that the higher the retorting temperature the greater the oil and retorting gas yields. The optimal retorting temperature for the North Korean oil shale is about 500 oC. The properties of the North Korean shale oil including density, viscosity, flash point and freezing point are found to be relatively low compared with those of shale oil from FuShun, China. The gasoline fraction, diesel fraction and heavy oil fraction account for 11.5 wt%, 41.5 wt% and 47 wt%, respectively. The major pyrolysis gases are CH4(the most abundant), H2, CO2, H2 S, CO, and C2-C5 hydrocarbons. The heat value of retorting gas is more than 900 kJ/mol, and the retorting gas has high sulfur content. | Wang Wei Li Shuyuan Li Linyue Ma Yue Yue Changtao He Jilai | 2014 | Petroleum Science2014，11，3： | 4 |
| 2 | Empirical likelihood for right censored data with covariables显示文摘For complete observation and p-dimensional parameterθdefined by an estimation equation,empirical likelihood method of construction of confidence region is based on the asymptoticχ2pdistribution of-2 log(EL ratio).For right censored lifetime data with covariables,however,it is shown in literature that-2 log(EL ratio)converges weakly to a scaledχ2pdistribution,where the scale parameter is a function of unknown asymptotic covariance matrix.The construction of confidence region requires estimation of this scale parameter.In this paper,by using influence functions in the estimating equation,we show that-2 log(EL ratio)converges weakly to a standardχ2pdistribution and hence eliminates the procedure of estimating the scale parameter. | HE ShuYuan LIANG Wei | 2014 | Science China Mathematics2014，57，6： | 4 |
| 3 | Theory of optimal blocking for fractional factorial split-plot designs显示文摘The issue of optimal blocking for fractional factorial split-plot (FFSP) designs is considered under the two criteria of minimum aberration and maximum estimation capacity. The criteria of minimum secondary aberration (MSA) and maximum secondary estimation capacity (MSEC) are developed for discriminating among rival nonisomorphic blcoked FFSP designs. A general rule for identifying MSA or MSEC blocked FFSP designs through their blocked consulting designs is established. | Al Mingyao & HE Shuyuan Key Laborartory of Pure and Applied Mathematics, School of Mathematical Sciences, Peking University, Beijing 100871, China | 2005 | Science China Mathematics2005，48，5： | 2 |
| 4 | THE STRONG LAW FOR THE P-L ESTIMATE IN THE LEFT TRUNCATED AND RIGHT CENSORED MODEL(I)显示文摘§1.IntroductionSupposethat{Xn},{Yn}and{Tn}arethreei.i.d.randomsequencesandindependentoneanother.LetF,GandLbetheirrightcontinu... | HE SHUYUAN * | 1998 | Chinese Annals of Mathematics,Series B1998，19，3： | 2 |
| 5 | A Note on the Mixed Geographically Weighted Regression Model显示文摘 | Mei Changlin He Shuyuan Fang Kaitai | 2004 | Journal of Regional Science2004，44，1： | 1 |
| 6 | Thermochemical sul- fate reduction simulation experiments on the formation and distribution of organic sulfur compounds in the tuha crude oil 显示文摘 | Yue Changtao Li Shuyuan Song He | 2014 | Bull Korean Chem Soc2014，35，7： | 1 |
| 7 | Estimation of Poisson intensity in the presence of dead time显示文摘 | He Shuyuan Yang Grace L Fang Kaitai | 2005 | Journal of the American Statistical Association2005，100，470： | 1 |
| 8 | CONVERGENCY OF THE MAXIMUM OF PERIODOGRAM显示文摘CONVERGENCYOFTHEMAXIMUMOFPERIODOGRAM￥HEShuyuan(DepartmentofProbabilityandStatistics,PekingUniversity,Beijing100871,China)Abst... | HE Shuyuan(Department of Probability and Statistics, Peking University, Beijing 100871,China) | 1995 | Systems Science and Mathematical Sciences1995，8，3： | 1 |
| 9 | A note on the mixed geographically weighted regression model显示文摘 | Mei Changlin He Shuyuan Fang Kaitai | 2004 | Journal of Regional Science A2004，44，： | 1 |
| 10 | Estimation of the mixed AR and hidden periodic model 显示文摘 | He Shuyuan | 1997 | ACTA Math Appl Sinica1997，13，： | 1 |
| 11 | Contact characteristics of conical involute gears with crossed axes显示文摘 | LI Jiangang WANG Shuyuan HE Jingliang | | 0，，： | 1 |
| 12 | Predicting metal-organic frameworks as catalysts to fix carbon dioxide to cyclic carbonate by machine learning显示文摘The process of discovering and developing new materials currently requires considerable effort,time,and expense.Machine learning(ML)algorithms can potentially provide quick and accurate methods for screening new materials.In the present work,the features of the metal organic frameworks(MOFs)as a catalyst for fixing carbon dioxide into cyclic carbonate were extracted to build a data set,which were collected from the experimental results of approximately 100 published papers.Classifiers were trained with the data set with various ML algorithms,including support vector machine(SVM),K-nearest neighbor classification(KNN),decision trees(DT),stochastic gradient descent(SGD),and neural networks(NN),to predict the catalytic performance.The ML models were trained on 80% of the data set and then tested on the remaining 20%to predict the carbon dioxide fixation ability.The trained ML model was extended to explore 1311 hypothetical MOFs,and some structures displayed a strong catalytic ability.Finally,the six best metal ions(Mn,V,Cu,Ni,Zr and Y)and four best ligands(tactmb,tdcbpp,TCPP,H_(3)L)were determined.These six metals and four ligands could be combined into 24 MOFs,which are strongly potential catalysts for carbon dioxide fixation.Using machine learning methods can speed up the screening of materials,and this methodology is promising for application not only to MOFs as catalysts but also in many other materials science projects. | Shuyuan Li Yunjiang Zhang Yuxuan Hu Bijin Wang Shaorui Sun Xinwu Yang Hong He | 2021 | Journal of Materiomics2021，7，5： | 0 |
| 13 | UNIFORM CONVERGENCY FOR WEIGHTED PERIODOGRAM OF STATIONARY LINEAR RANDOM FIELDS显示文摘UNIFORMCONVERGENCYFORWEIGHTEDPERIODOGRAMOFSTATIONARYLINEARRANDOMFIELDS￥HESHUYUANAbstract:Let{Xn;n∈N2}beatwodimensionallyindex... | HE SHUYUAN(Department of Probability and Statistics, Beijing University, Beijing 100871, China.) | 1995 | Chinese Annals of Mathematics,Series B1995，16，3： | 0 |
| 14 | High Temperature Thermal Physical Properties of High-alumina Fibrous Insulation显示文摘填了金属性的热保护系统的高氧化铝的含纤维的屏蔽的热性质被调查。含纤维的屏蔽的有效热传导性从 10 ~在气压下面被测量(-2)到 10 ~ 5 Pa.In 增加,特定的热和 Rosseland 吝啬的扑灭系数的变化试验性地在各种各样的包围温度下面被决定直到 973 K.The 光谱因为温度的一个函数是计算的基于,扑灭系数用啤酒的 law.Rosseland 平均数扑灭系数在 2.5-25 亩 m 的波长范围从发射度数据被获得光谱扑灭在各种各样的温度的系数。结果证明样品的热传导性与增加温度和压力增加。温度增加的特定的热增加,证明热吸收的能力增加,逐渐地第一与样品的 temperature.Rosseland 平均数扑灭系数减少然后与增加温度增加。 | Boming ZHANG Shuyuan ZHAO Xiaodong HE Shanyi DU | 2007 | Journal of Materials Science & Technology2007，23，6： | 0 |
| 15 | The LIL Convergence for Stationary Linear Random Field | He Shuyuan Department of Probability and Statistics Peking University Beijing, 100871 China | 1996 | Acta Mathematica Sinica,English Series1996，12，4： | 0 |
| 16 | HEAVY RANDOM CENSORING LIMIT THEOREMS显示文摘In this paper, we present some limit distribution theorems for Kaplan-Meierestimator in a randomly heavy censoring model. | HE Shuyuan(Department of Probability and Statistics, Peking University, Beijing 100871, China) | 1999 | Systems Science and Mathematical Sciences1999，12，3： | 0 |
| 17 | Loss of Spike N370 glycosylation as an important evolutionary event for the enhanced infectivity of SARS-CoV-2显示文摘Dear Editor,SARS-CoV-2 belongs to the Sarbecovirus subgenus of betacoronaviruses and other members in this subgenus include SARS-CoV and coronaviruses mainly found in bats1.It is generally believed that like SARS-CoV and MERS-CoV,SARS-CoV-2 has a natural origin and was selected either in animal hosts before zoonotic transfer,or in humans following zoonotic transfer2.However,the molecular determinants for host expansion of SARS-CoV-2 from animal reservoirs to humans remain largely unclear. | Shuyuan Zhang Qingtai Liang Xinheng He Chongchong Zhao Wenlin Ren Ziqing Yang Ziyi Wang Qiang Ding Haiteng Deng Tong Wang Linqi Zhang Xinquan Wang | 2022 | Cell Research2022，32，3： | 0 |
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