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Experimental investigation of fluidized-bed reactor performance for oxidative coupling of methane

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Journal of Natural Gas Chemistry 2012年第5期21卷 534-543页

作者： S.Jašo S.Sadjadi H.R.Godini u.simon S.Arndt O.Görke A.Berthold H.Arellano-Garcia H.Schubert R.Schomäcker G.Wozny Chair of Process Dynamics and Operation Berlin Institute of TechnologyStraβe des 17 Juni 135Sekr.KWT910623 BerlinGermany Institute for Material Science and Technologies Berlin Institute of TechnologyHardenbergstr.4010623 BerlinGermany Institute for Technical Chemistry Berlin Institute of TechnologyStraβe des 17 Juni 12410623 BerlinGermany

Performance of the oxidative coupling of methane in fluidized-bed reactor was experimentally investigated using Mn-Na2WO4/SiO2,La2O3/CaO and La2O3-SrO/CaO *** catalysts were found to be stable,especially Mn-Na2WO4/SiO2 *** effect of sodium content of this catalyst was analyzed and the challenge of catalyst agglomeration was addressed using proper catalyst composition of 2%Mn2.2%Na2WO4/*** other two catalysts,the effect of Lanthanum-Strontium content was analyzed and 10%La2O 3-20%SrO/CaO catalyst was found to provide higher ethylene yield than La2O3/CaO ***,the effect of operating parameters such as temperature and methane to oxygen ratio were also *** highest ethylene and ethane （C2） yield was achieved with the lowest methane to oxygen ratio around 2.40.5% selectivity to ethylene and ethane and 41% methane conversion were achieved over La2O3-SrO/CaO catalyst while over Mn-Na2WO4 /SiO2 catalyst,40% and 48% were recorded,***,the consecutive effects of nitrogen dilution,ethylene to ethane production ratio and other performance indicators on the down-stream process units were qualitatively discussed and Mn-Na2WO4/SiO2 catalyst showed a better performance in the reactor and process scale analysis.

关键词： oxidative coupling of methane (OCM) fluidized-bed reactor catalyst stability

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程序性细胞死亡

德国医学 1999年第1期16卷 54-55页

作者：郝连杰 H.-u.simon 同济医科大学附属同济医院

真核细胞的死亡可以通过两个不同的途经,其一是细胞因严重损伤而死亡,这种情况常是偶然出现的死亡。例如细胞的血液供给突然中断,受到某种毒物或高温的损害,这种细胞死亡称为坏死。死的过程的特征是早期失去细胞膜的完整性,因此,细胞内... 详细信息

真核细胞的死亡可以通过两个不同的途经,其一是细胞因严重损伤而死亡,这种情况常是偶然出现的死亡。例如细胞的血液供给突然中断,受到某种毒物或高温的损害,这种细胞死亡称为坏死。死的过程的特征是早期失去细胞膜的完整性,因此,细胞内容物游离出,导致炎症反应。

关键词：病理学细胞死亡生理性程序性

四川盆地丘陵区冬性豆科牧草与小麦不同间作系统的评价

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草地学报 1996年第3期4卷 201-206页

作者： u.simon 周寿荣毛凯 InstituteofGrassland TechniqueUniversityofMunich85350Freising-WeihenstephanGermany 四川农业大学

本项研究系在当地现行农作制中利用带状种植冬小麦地的预留行间作不同冬性豆科牧草，通过比较评价为当地牧业发展增产饲料探索高效的草麦间作系统。结果表明：小麦间紫云英（70％）＋饲用碗豆（30％）、小麦间白三叶草和小麦间长柔毛野... 详细信息

本项研究系在当地现行农作制中利用带状种植冬小麦地的预留行间作不同冬性豆科牧草，通过比较评价为当地牧业发展增产饲料探索高效的草麦间作系统。结果表明：小麦间紫云英（70％）＋饲用碗豆（30％）、小麦间白三叶草和小麦间长柔毛野碗百三个间作系统，在其小麦产量高于对照（带状单作小麦）3．09～12．89％的情况下，增产了词料，获得较高的饲料价值（DM1．05～1．22t／公顷，TDOM0．78～0．89t／公顷，CP0，29～0．36t／公顷，ME0．57～0．68×104MJ／公顷）。小麦间紫云英（70％）＋饲用蚕豆（3％）处理在增产饲料的同时，对土壤也产生了较好的影响。这些间作系统提高了农田生态位的利用效率和单位面积土地的物质生产能力，在不影响粮食生产的情况下增产饲料，有利于促进养殖业的发展和农牧结合。

关键词：间作系统冬性豆科牧草冬小麦间作作物

四川盆地低山丘陵区混播冬性一年生牧草玉米轮作的研究

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草地学报 1996年第4期4卷 260-265页

作者：周寿荣 u.simon 毛凯四川农业大学 InstituteofGrassland TechniqueUniversityofMunichD-85350Freising-WeihenstephanGermany

本项研究旨在为四川盆地亚热带低山丘陵区增产饲料发展牧业探索高效的旱地混潘冬性一年生牧草－玉米短期草田轮作系统。重复了三年，所有资料为三年的平均值和共同趋势。研究结果表明，混播冬性一年生禾草和豆草与玉米轮作，即意大利黑... 详细信息

本项研究旨在为四川盆地亚热带低山丘陵区增产饲料发展牧业探索高效的旱地混潘冬性一年生牧草－玉米短期草田轮作系统。重复了三年，所有资料为三年的平均值和共同趋势。研究结果表明，混播冬性一年生禾草和豆草与玉米轮作，即意大利黑麦草（20％）＋紫云英（80％）→玉米、意大利黑麦草（30％）＋南苜蓿（70％）→玉米和意大利黑麦草（25％）＋长柔毛野豌豆（75％）→玉米三个轮作系统。在玉米产量稍低于对照但差异不显著的情况下，获得了很高的饲料价值（DM5．31～5．77t／hm2，TDOM4.06～4．36t／hm2，CP1．10～1．58t／hm2，ME3．18～3．39X104MJ／hm2，Ca33．62～52．49kg／hm2，P27．79～30．59kg／hm2），较充分地利用了禾草和豆草的共生互惠作用，提高了农田生态位的利用效率，从而获得较高的总生产效率。

关键词：混播轮作南苜蓿黑麦草玉米生产效率

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试验方法对栽培牧草自由采食试验结果的影响

试验方法对栽培牧草自由采食试验结果的影响

“加强世界饲草——牲畜系统”第十四届国际草地会议

作者： u.simon P.DANIEL 周勇 Justus-Liebig-universitt Giessen Federal Republic of Germany

当牧草给与牲畜自由采食时,牲畜采食饲草的数量是牧草营养价值的一个重要标志。它受若干内外因素的影响。也许部份地由于使用的评价方法的原因,在有关文献报导中关于这个题目研究的实验结果常常是矛盾的。我们研究了不同的试验方法是否...

当牧草给与牲畜自由采食时,牲畜采食饲草的数量是牧草营养价值的一个重要标志。它受若干内外因素的影响。也许部份地由于使用的评价方法的原因,在有关文献报导中关于这个题目研究的实验结果常常是矛盾的。我们研究了不同的试验方法是否影响栽培牧草采食试验的结果,以及影响的程度。

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多年生禾本科牧草发育阶段描述方案

多年生禾本科牧草发育阶段描述方案

Electrical control of quantum emitters in a Van der Waals heterostructure

“加强世界饲草——牲畜系统”第十四届国际草地会议

作者： u.simon B.H.PARK 曹自成 Justus-Liebig-universitt Giessen Federal Republic of Germany and Korean-German Grassland Research ProjectO.R.D.SuweonRepublic of Korea

禾本科牧草发育形态学阶段的描述方案对于科学研究和实践都是迫切需要的。它能作为经营措施的精确计时,诸如施肥和农药的使用,关于某个牧草产量和品质的刈割期等。曾为谷类作物制定了一些生活的方案。象Feekes级别（Scale）及其修正等...

禾本科牧草发育形态学阶段的描述方案对于科学研究和实践都是迫切需要的。它能作为经营措施的精确计时,诸如施肥和农药的使用,关于某个牧草产量和品质的刈割期等。曾为谷类作物制定了一些生活的方案。象Feekes级别（Scale）及其修正等。它们都没有足够地考虑牧草中多年生禾草生长的发育特殊阶段。

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Light(Science & Applications) 2022年第8期11卷 1790-1798页

作者： simon J.u.White Tieshan Yang Nikolai Dontschuk Chi Li Zai-Quan Xu Mehran Kianinia Alastair Stacey Milos Toth Igor Aharonovich School of Mathematical and Physical Sciences University of Technology SydneyUltimoNSW2007Australia ARC Centre of Excellence for Transformative Meta-Optical Systems University of Technology SydneyUltimoNSW2007Australia School of Physics University of MelbourneParkvilleVIC3010Australia School of Science RMIT UniversityMelbourneVIC3001Australia

Controlling and manipulating individual quantum systems in solids underpins the growing interest in the development of scalable quantum ***,hexagonal boron nitride(hBN)has garnered significant attention in quantum photonic applications due to its ability to host optically stable quantum ***,the large bandgap of hBN and the lack of efficient doping inhibits electrical triggering and limits opportunities to study the electrical control of ***,we show an approach to electrically modulate quantum emitters in an hBN-graphene van der Waals *** show that quantum emitters in hBN can be reversibly activated and modulated by applying a bias across the ***,a significant number of quantum emitters are intrinsically dark and become optically active at non-zero *** explain the results,we provide a heuristic electrostatic model of this unique ***,employing these devices we demonstrate a nearly-coherent source with linewidths of~160 *** results enhance the potential of hBN for tunable solid-state quantum emitters for the growing field of quantum information science.

关键词： quantum hexagonal boron

LIOuVILLE TYPE THEOREM FOR THE STATIONARY EQuATIONS OF MAGNETO-HYDRODYNAMICS

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Acta Mathematica Scientia 2019年第2期39卷 491-497页

作者： simon SCHuLZ Mathematical Institute University of Oxford

We show that any smooth solution(u, H) to the stationary equations of magnetohydrodynamics belonging to both spaces L^6(R^3) and BMO^(-1)(R^3) must be identically *** is an extension of previous results, all of which systematically required stronger integrability and the additional assumption ▽u, ▽H∈L^2(R^3), i.e., finite Dirichlet integral.

关键词： Liouville theorem Caccioppoli inequality Navier-Stokes equations MHD

Axisymmetric alternating direction explicit scheme for efficient coupled simulation of hydro-mechanical interaction in geotechnical engineering-Application to circular footing and deep tunnel in saturated ground

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第2期10卷 259-279页

作者： simon Heru Prassetyo Marte Gutierrez Department of Civil and Environmental Engineering Colorado School of MinesGoldenUSA Mining Engineering Program Institut Teknologi BandungBandungIndonesia

Explicit solution techniques have been widely used in geotechnical engineering for simulating the coupled hydro-mechanical(H-M) interaction of fluid flow and deformation induced by structures built above and under saturated ground, i.e. circular footing and deep tunnel. However, the technique is only conditionally stable and requires small time steps, portending its inefficiency for simulating large-scale H-M problems. To improve its efficiency, the unconditionally stable alternating direction explicit(ADE)scheme could be used to solve the flow problem. The standard ADE scheme, however, is only moderately accurate and is restricted to uniform grids and plane strain flow conditions. This paper aims to remove these drawbacks by developing a novel high-order ADE scheme capable of solving flow problems in nonuniform grids and under axisymmetric conditions. The new scheme is derived by performing a fourthorder finite difference(FD) approximation to the spatial derivatives of the axisymmetric fluid-diffusion equation in a non-uniform grid configuration. The implicit Crank-Nicolson technique is then applied to the resulting approximation, and the subsequent equation is split into two alternating direction sweeps,giving rise to a new axisymmetric ADE scheme. The pore pressure solutions from the new scheme are then sequentially coupled with an existing geomechanical simulator in the computer code fast Lagrangian analysis of continua(FLAC). This coupling procedure is called the sequentially-explicit coupling technique based on the fourth-order axisymmetric ADE scheme or SEA-4-AXI. Application of SEA-4-AXI for solving axisymmetric consolidation of a circular footing and of advancing tunnel in deep saturated ground shows that SEA-4-AXI reduces computer runtime up to 42%-50% that of FLAC’s basic scheme without numerical instability. In addition, it produces high numerical accuracy of the H-M solutions with average percentage difference of only 0.5%-1.8%.

关键词： Hydro-mechanical(H-M) interaction Explicit coupling technique Alternating direction explicit(ADE) scheme High-order finite difference(FD) Non-uniform grid Axisymmetric consolidation Circular footing Deep tunnel in saturated ground