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| 1 | Enhancement of Bio-based para-Xylene Selectivity in Catalytic Fast Pyrolysis of Cellulose Using a Surface-modified Mg/P/HZSM-5 Catalyst显示文摘With the growing consumption of oil, the production of /?-xylene(PX) from renewable biomass has gained significant attention recently. This work demonstrated that cellulose, a main component in lignocellulosic biomass, was directly converted into PX over the Mg/P surface-modified zeolites. The catalysts modified by the incorporation of P2O5 and MgO into HZSM-5(HZ) promoted the isomerization of zw-/o-xylenes to p-xylene. The PX selectivity was greatly enhanced using the modified zeolites due to the deactivation of external surface and the adjustment of pore entrance. In addition, the addition of methanol to cellulose was beneficial to increase the selectivity of xylenes due to the alkylation reactions and the Diels-Alder reactions between cellulose-derived furans and methanol-derived olefins. The highest PX yield of 10.7%(molar fraction) with a high PX selectivity in xylenes(97.1%) was obtained over the 10%Mg/5%P/HZ catalyst. The reaction pathway for the formation ofp-xylene was addressed according to the study of the key reactions and the characterization of catalysts. | WANG Yulan FAN Minghui ZHU Lijuan WANG Shengfei HE Yuting LI Quanxin | 2019 | Chemical Research in Chinese Universities2019，35，3： | 4 |
| 2 | Pool-Forming Stages and Enrichment Models of Medium- to High-Rank Coalbed Methane显示文摘coalbed 甲烷的形成水池的机制有它的自己的特征。在这份报纸,基于在中国的典型的忍受煤的盆上的研究,这被指出媒介的水库形成 -- 到高等级的 coalbed,甲烷经历了三个批评阶段:coalbed 甲烷产生和吸附阶段和保藏舞台。地区性的构造进化,水动力学条件和封上的条件在 coalbed 甲烷解吸附作用散开和保藏的阶段起重要作用。中等 -- 到高等级的 coalbed,甲烷有丰富模型的三种类型,也就是说最有利,相对有利,并且相反的丰富模型。 | SONG Yan ZHAO Mengjun HONG Feng LIU Shaobo QIN Shengfei WANG Hongyan | 2010 | Acta Geologica Sinica(English Edition)2010，84，6： | 4 |
| 3 | The Design and Implementation of a Digital Music Library显示文摘 | Wang Chaokun Li Jianzhong Shi Shengfei | 2006 | International Journal on Digital Libraries2006，6，1： | 1 |
| 4 | Production of Bio-hydrogen Using Bio-oil as a Potential Biomass-derived Renewable Feedstock显示文摘The bio-oil derived from pyrolysis of straw can be selectively converted into high-purity hydrogen by coupling three steps:(i)steam refonning(SR)of di tierent bio-oils,(ii)water-gas shift(WGS),and(iii)the removal of CO2.the catalytic SR reaction over the NiLaTiAl catalyst,coupled with a low-temperature WGS reaction with the CuZnAl catalyst,promoted the conversion of various oxygen-contaming organic compounds in the bio-oil into hydrogen and carbon dioxide.Under the optimized condition,light bio-oil achieved the highest conversion(99.8%,molar fraction),with a high hydrogen yield of 16.4%(mass traction)and a H2 purity of 99.94%(volume fraction).The carbon deposition on the NiLaTiAl catalyst was the main factor caused catalyst deactivation.Production of hydrogen from different bio-oil model compounds was also investigated in detail. | LIU Junxu ZHU Lijuan WANG Shengfei WANG Yulan HE Yuting LI Quanxin | 2019 | Chemical Research in Chinese Universities2019，35，2： | 0 |
| 5 | In situ Characterization of Phase Transition of Amorphous Poly(9,9-di-n-octyl-2,7-fluorene)Thin Film During Thermal Annealing显示文摘Amorphous poly(9,9-di-n-octyl-2,7-fluorene)(PFO)thin films were characterized in situ via thermal an- nealing based on grazing incidence X-ray diffraction(GIXRD)profiles,UV-visible absorption spectrophotometry,and Fourier transform infrared spectroscopy(FTIR).The results of GIXRD indicated that the amorphous phase transformed into a crystalline phase when the annealing temperature was higher than 80 ℃.Different outcomes were elicited for the intensities and d-spacings of the diffraction peaks below and above 80 ℃,which were attributed to the formation of the κ-phase.The mechanism of phase transition was revealed by in situ UV-visible absorption and FTIR spectra,whereby the rearrangement of the side chains was dominant and the movement of the main chains was minimal,even when the annealing temperature was lower than 80 ℃.In contrast,the rearrangement of the main chains was dominant when the temperature was higher than 80 ℃. | MENG Shengfei WANG Pengyue CHEN Liuran GAO Guanghui ZHANG Jidong | 2019 | Chemical Research in Chinese Universities2019，35，1： | 0 |
| 6 | Experimental study on the geomechanical properties and failure behaviour of interbedded shale during SAGD operation显示文摘Interbedded shale(IBS)impedes the development of a steam chamber and poses a serious threat to the success of any steam-assisted gravity drainage(SAGD)operation in a heavy-oil reservoir.Breaking up IBS has been a continual challenge for the industry.This study summarizes experimental studies on the geomechanical properties and failure behaviour of IBS during thermal stimulation.IBS cores were collected by means of fully sealed coring in northwestern China.Mineral composition analysis,porosity,and permeability measurement,as well as imbibition tests,were initiated to evaluate the potential of imbibition.First,shear failure behaviour was studied through triaxial compression tests.Second,pore structure and failure processes of IBS were investigated through thermal stimulation experiments.Mudstone IBS was considered as the focus.Its porosity was approximately 7%and permeability was approximately 100 nD while in-situ stress was applied.Although IBS contained conside rable smectite components,it didn't disintegrate under high.effective stress.Last,shear failure behaviour of IBS was observed by computer tomography(CT)scanning when IBS was heated up to 180°C under constant radial confining pressure and axial constraint of strain.While imbibition causes disintegration of IBS,it is unlikely when under in-situ stress conditions.Fortunately,shear failure can be achieved under uniaxial boundary conditions with rapid heating. | Shengfei Zhang Xiuluan Li Hongzhuang Wang | 2020 | Petroleum Research2020，5，4： | 0 |
| 7 | Optimization Analysis of Hadoop显示文摘Hadoop is a distributed data processing platform supporting MapReduce parallel computing framework. In order to deal with general problems, there is always a need of accelerating Hadoop under certain circumstance such as Hive jobs. By outputting current time to logs at specially selected points, we traced the workflow of a typical MapReduce job generated by Hive and making time statistics for every phase of the job. Using different data quantities, we compared the proportion of each phase and located the bottleneck points of Hadoop. We make two major optimization advices: (1) focus on using combine and optimizing Net Work and Disk IO when dealing with big jobs having a large number of intermediate results; (2) optimizing map function and Disk IO when dealing with short jobs. | Jinglun Li Shengfei Shi Hongzhi Wang | 2016 | 国际计算机前沿大会会议论文集2016，，1： | 0 |
| 8 | An Anomaly Detection Method Based on Learning of "Scores Sequence"显示文摘 | Dongsheng Li Shengfei Shi Yan Zhang Hongzhi Wang Jizhou Luo | 2018 | 国际计算机前沿大会会议论文集2018，，2： | 0 |
| 9 | A Method to Identify Spark Important Parameters Based on Machine Learning显示文摘 | Tianyu Li Shengfei Shi Jizhou Luo Hongzhi Wang | 2018 | 国际计算机前沿大会会议论文集2018，，1： | 0 |
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