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International Journal of Coal Science & Technology 2018年第4期5卷 439-451页

作者： fanhui meng Xin Li Xiaoyang Lv Zhong Li Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province Institute of Coal Chemical EngineeringTaiyuan University of TechnologyNo.79 West Yingze StreetTaiyuan 030024ShanxiChina

The hydrogenation of CO to synthetic natural gas (SNG) needs a high molar ratio of H2/CO (usually large than 3.0 in industry), which consumes a large abundant of hydrogen. The reverse dry reforming reaction (RDR, 2H2 + 2CO←→CH4 + CO2), combining CO methanation with water-gas-shift reaction, can significantly decrease the H2/CO molar ratio to 1 for SNG production. A detailed thermodynamic analysis of RDR reaction was carried out based on the Gibbs free energy minimization method. The effect of temperature, pressure. H2/CO ratio and the addition of H2O, CH4, CO2, O2 and C2H4 into the feed gas on CO conversion, CH4 and CO2 selectivity, as well as CH4 and carbon yield, are discussed. Experimental results obtained on homemade impregnated Ni/Al2O3 catalyst are compared with the calculations. The results demonstrate that low temperature (200-500 °C), high pressure (1-5 MPa) and high H2/CO ratio (at least 1) promote CO conversion and CH4 selectivity and decrease carbon yield. Steam and CO2 in the feed gas decrease the CH4 selectivity and carb on yield, and enhance the CO2 con tent. Extra CH4 elevates the CH4 content in the products, but leads to more carbon formation at high temperatures. O2 significantly decreases the CH4 selectivity and C2H4 results in the generation of carbon.

关键词： Synthetic natural gas Reverse dry reforming of methane Gibbs free energy minimization Experimental study CO conversion

Influence of Na^(+) on the synthesis of silicalite-1 catalysts for use in the vapor phase Beckmann rearrangement of cyclohexanone oxime

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Frontiers of Chemical Science and Engineering 2011年第4期5卷 401-408页

作者： Rumin YANG fanhui meng Xiao WANG Yaquan WANG Key Laboratory for Green Chemical Technology School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Silicalite-1 was hydrothermally synthesized in the presence of different concentrations of Na+using tetrapropylammonium hydroxide(TPAOH)as a *** synthesis was followed by a base *** silicalite-1samples were characterized using X-ray diffrac-tion,scanning electron microscopy,N2 adsorption,X-ray photoelectron spectroscopy,Fourier transform infrared spectroscopy and NH3 temperature-programmed *** samples were used as catalysts for the vapor phase Beckmann rearrangement of cyclohexanone *** the synthesis,the sodium ions were incorporated onto the silicalite-1 crystals,but were then removed by the base *** the catalysts exhibited nearly complete conversion of cyclohexanone oxime toε-caprolactam with selectivities grater than 95%.Addition of less than 2.5 mol-%Na^(+)(relative to TPAOH)did not inﬂuence the catalytic ***,for Na+concentrations≥5 mol-%,the particle sizes of silicalite-1 increased and the catalytic activities decreased,which can be attributed to carbon *** results in this work are of great importance for the polymer industry.

关键词： silicalite-1 cyclohexanone oxime vapor phase Beckmann rearrangement ε-caprolactam

Reducibility for a Class of Two-Dimensional almost Periodic System with Small Perturbation

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Advances in Pure Mathematics 2021年第12期11卷 950-962页

作者： fanhui meng Wenhua Qiu School of Mathematics and Statistics Zaozhuang University Zaozhuang China

This paper focuses on the reducibility of two-dimensional almost periodic system with small perturbation. We use the KAM iterative method to get the reducibility by an almost periodic transformation. The system has be... 详细信息

关键词： Almost Periodic System KAM Iterative Method Reducibility

Alpha particle detection with a planar CdZnTe detector and relative simulations

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Radiation Detection Technology and Methods 2021年第4期5卷 609-617页

作者： Yu Xiang Xiaopan Jiang Chao Wang fanhui meng Yiding Han Xianchao Huang Long Wei Beijing Engineering Research Center of Radiographic Techniques and Equipment Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Jinan Laboratory of Applied Nuclear Science Jinan 250131China

Purpose The performance of CZT inγ-ray and X-ray detection is growing rapidly in these ***,there are only a few reports on its utilization inαparticle ***,to study the properties of CZT for detection ofαparticle,a detection system has been manufactured,and a series of simulations have been *** A 22×22×0.7mm^(3) planar CZT detector is deployed to detect theαparticles from a radiation source containing Am-241 and Pu-239,while COMSOL MultiPhysics and GEANT4 are employed in the simulation of charge collection and interaction betweenαparticles and *** An energy resolution of 1.47%FWHM at 5.486MeV and 1.32%at 5.157MeV has been achieved.A simulated spectrum has been created,and it is analogous to the one from *** The experiment results show the potential of CZT inα*** simulations are confirmed effective and will guide a better design of the detecting system.

关键词： αparticle CZT detector Simulation Energy resolution Mobility-lifetime product Charge collection Interaction

Nanoporous titanium implant surface promotes osteogenesis by suppressing osteoclastogenesis via integrin β1/FAKpY397/MAPK pathway

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Bioactive Materials 2022年第2期7卷 109-123页

作者： Yide He Zhe Li Xin Ding Boya Xu Jinjin Wang Yi Li Fanghao Chen fanhui meng Wen Song Yumei Zhang State Key Laboratory of Military Stomatology&National Clinical Research Center for Oral Diseases&Shaanxi Key Laboratory of Oral Diseases Department of ProsthodonticsSchool of StomatologyThe Fourth Military Medical UniversityXi’anChina Huaian Stomatological Hospital NanjingChina State Key Laboratory of Military Stomatology&National Clinical Research Center for Oral Diseases&Shaanxi Key Laboratory of Oral Diseases Department of PeriodontologySchool of StomatologyThe Fourth Military Medical UniversityXi’anChina State Key Laboratory of Military Stomatology Department of Dental MaterialsSchool of StomatologyThe Fourth Military Medical UniversityXi’anShaanxiChina

Macrophages and osteoclasts are both derived from monocyte/macrophage lineage,which plays as the osteoclastic part of bone *** they are regulated by bone implant surface nanoarchitecture and involved in osseointegration,the beneath mechanism has not been simultaneously analyzed in a given surface model and their communication with osteoblasts is also ***,the effect of implant surface topography on monocyte/macrophage lineage osteoclastogenesis and the subsequent effect on osteogenesis are systematically *** nanoporous surface is fabricated on titanium implant by etching and anodizing to get the nanotubes *** early bone formation around implant is significantly accelerated by the nanoporous surface in ***,the macrophage recruitment and osteoclast formation are increased and decreased ***,the integrin mediated FAK phosphorylation and its downstream MAPK pathway(p-p38)are significantly downregulated by the nanoporous surface,which account for the inhibition of *** addition,the nanoporous surface can alleviate the inhibition of osteoclasts on osteogenesis by changing the secretion of clastokines,and accelerate bone regeneration by macrophage cytokine *** conclusion,these data indicate that physical topography of implant surface is a critical factor modulating monocyte/macrophage lineage commitment,which provides theoretical guidance and mechanism basis for promoting osseointegration by coupling the osteogenesis and osteoclastogenesis.

关键词： Nanoporous implant Osteogenesis Osteoclastogenesis FAK phosphorylation MAPK

Conserved and differentiated functions of CIK receptor kinases in modulating stem cell signaling in Arabidopsis

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Molecular Plant 2021年第7期14卷 1119-1134页

作者： Yafen Zhu Chong Hu Yanwei Cui Li Zeng Sunjingnan Li Mingsong Zhu fanhui meng Shuting Huang Li Long Jing Yi Jia Li Xiaoping Gou Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations School of Life SciencesLanzhou UniversityLanzhou 730000China

The shoot apical meristem(SAM)and root apical meristem(RAM)act as pools of stem cells that give rise to aboveground and underground tissues and organs in higher plants,*** CLAVATA3(CLV3)-WUSCHEL(WUS)negative-feedback loop acts as a core pathway controlling SAM homeostasis,while CLV3/EMBRYO SURROUNDING REGION(ESR)40(CLE40)and WUSCHEL-RELATED HOMEOBOX5(WOX5),homologs of CLV3 and WUS,direct columella stem cell ***,CLV3 INSENSITIVE KINASES(CIKs)have been shown to be essential for maintaining SAM homeostasis,whereas whether they regulate the distal root meristem remains to be ***,we report that CIKs are indispensable for transducing the CLE40 signal to maintain homeostasis of the distal root *** found that the cik mutant roots displayed disrupted quiescent center and delayed columella stem cell(CSC)*** assays demonstrated that CIKs interact with ARABIDOPSIS CRINKLY4(ACR4)in a ligand-independent manner and can be phosphorylated by ACR4 in *** addition,the phosphorylation of CIKs can be rapidly induced by CLE40,which partially depends on *** CIKs act as conserved and redundant regulators in the SAM and RAM,our results demonstrated that they exhibit differentiated functions in these meristems.

关键词： ACR4 CIKs CLE40 stem cells distal root meristem phosphorylation

燃料对燃烧法制备Ni-Al2O3催化剂结构及浆态床甲烷化催化性能的影响

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高等学校化学学报 2016年第1期37卷 134-141页

作者：吉可明孟凡会高源李忠太原理工大学煤科学与技术教育部和山西省重点实验室太原030024

分别采用浸渍燃烧法和共燃烧法制备了一系列Ni-Al2O3催化剂,并对催化剂进行了表征,研究了燃料种类对不同方法制备的催化剂结构及浆态床CO甲烷化性能的影响.结果表明,以尿素、甘氨酸和乙二醇为燃料时,采用浸渍燃烧法制备的Ni-Al2O3催化... 详细信息

分别采用浸渍燃烧法和共燃烧法制备了一系列Ni-Al2O3催化剂,并对催化剂进行了表征,研究了燃料种类对不同方法制备的催化剂结构及浆态床CO甲烷化性能的影响.结果表明,以尿素、甘氨酸和乙二醇为燃料时,采用浸渍燃烧法制备的Ni-Al2O3催化剂织构性质均与载体相近,各催化剂金属Ni分散度和Ni晶粒相差不大,甲烷化性能接近,在260℃反应温度下CO转化率在80.1%~83.5%之间.而共燃烧法制备的Ni-Al2O3催化剂受燃烧过程影响明显,以甘氨酸和乙二醇为燃料时制得的催化剂比表面积较小,金属Ni分散度低且Ni晶粒较大,因而甲烷化活性较低;以尿素为燃料制备的催化剂比表面积大且Ni晶粒较小,CO转化率和CH4选择性分别达到84.7%和91.1%.

关键词：浆态床甲烷化 Ni-Al2O3催化剂浸渍燃烧法共燃烧法燃料

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具变指数的拟线性方程解的最大模估计

吉林大学学报（理学版） 2015年第5期53卷 947-949页

作者：孟繁慧吉林省金融文化研究中心长春130028 长春金融高等专科学校长春130028

考虑p(x)-Laplace方程Dirichlet边值问题的L∞估计,通过改进的迭代引理和De Giorgi迭代,给出了非负不增函数Ak∶=meas{x∈Ω:u>k}的估计,并应用迭代引理得到了解的L∞正则性.结果表明:利用这种改进的De Giorgi迭代,在得到解的L∞估计时... 详细信息

考虑p(x)-Laplace方程Dirichlet边值问题的L∞估计,通过改进的迭代引理和De Giorgi迭代,给出了非负不增函数Ak∶=meas{x∈Ω:u>k}的估计,并应用迭代引理得到了解的L∞正则性.结果表明:利用这种改进的De Giorgi迭代,在得到解的L∞估计时,也可得到该解对各种指标精确的依赖关系;这种正则性技术可应用到带有退化和奇异低阶项的偏微分方程中.

关键词：最大模变指数 p(x)-Laplace方程迭代

Ni-Mn/Al_2O_3催化剂在浆态床中CO甲烷化催化性能

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化工学报 2014年第8期65卷 2997-3003页

作者：孟凡会常慧蓉李忠太原理工大学煤科学与技术教育部和山西省重点实验室山西太原030024

采用共浸渍法制备了Ni-Mn/Al2O3催化剂,考察了助剂Mn的含量对催化剂结构及浆态床CO甲烷化性能的影响。采用XRD、H2-TPR、BET、TEM、H2-化学吸附等表征对催化剂进行了测试分析,结果表明,Mn助剂的引入能够促进Ni物种在载体表面的分散,减... 详细信息

采用共浸渍法制备了Ni-Mn/Al2O3催化剂,考察了助剂Mn的含量对催化剂结构及浆态床CO甲烷化性能的影响。采用XRD、H2-TPR、BET、TEM、H2-化学吸附等表征对催化剂进行了测试分析,结果表明,Mn助剂的引入能够促进Ni物种在载体表面的分散,减弱Ni物种与载体的相互作用,降低催化剂的还原温度,提高催化剂的比表面积,减小活性金属Ni的晶粒尺寸。随着Mn含量的增加,Ni-Mn/Al2O3催化剂的甲烷化性能先升后降,其中以Mn含量为4%(质量分数)时的催化甲烷化性能最佳,添加过量的Mn导致活性组分Ni被部分覆盖,催化甲烷化性能下降。通过对16Ni4Mn/Al2O3催化剂样品的浆态床反应温度及反应压力的研究发现,当反应温度为280℃、反应压力为1.5 MPa时,催化剂样品16Ni4Mn/Al2O3的CO转化率及CH4选择性分别达到96.2%和88.8%。

关键词：浆态床反应器合成气甲烷化天然气 Ni-Mn Al2O3催化剂 Mn助剂

惠州石化有限公司连续重整装置工艺流程模拟与优化

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化工进展 2017年第7期36卷 2724-2729页

作者：孟凡辉纪传佳杨纪中海油惠州石化有限公司广东惠州516086

以惠州石化有限公司200×10~4t/a连续重整装置为研究对象,采用英国先进技术公司KBC的流程模拟软件Petro-SIM,建立了预加氢部分、重整反应部分以及重整全流程模型,以期优化装置操作条件,改善装置的生产瓶颈。应用该模型分别对重整加权平... 详细信息

以惠州石化有限公司200×10~4t/a连续重整装置为研究对象,采用英国先进技术公司KBC的流程模拟软件Petro-SIM,建立了预加氢部分、重整反应部分以及重整全流程模型,以期优化装置操作条件,改善装置的生产瓶颈。应用该模型分别对重整加权平均反应入口温度以及重整装置的3条分馏塔进行了优化分析。模拟结果得出,重整加权平均反应入口温度在520.7~521.7℃时,重整操作条件最优;预加氢产物汽提塔底温度在235℃、塔压在1.01MPa、进料温度在171℃时达到最佳的分离效果;重整脱戊烷塔塔压在1.02MPa、重整脱丁烷塔塔压在1.0MPa时塔的操作最优。通过实施优化措施,将重整加权平均反应入口温度由517.7℃提高至521℃,可增产芳烃2.7×10~4t/a,氢气1.126×10~7m^3/a;分别将汽提塔塔压、脱戊烷塔塔压以及脱丁烷塔塔压由1.1MPa降至1.0MPa,共节约燃料气3.528×10~6m^3,多回收C6环烷烃2.306×10~4t/a。核算装置效益,全年可实现节能效益197.9万元,提升装置经济效益3128.8万元。

关键词：连续重整装置模拟模型优化节能