323,151 research outputs found
Emms, H E, SX6475
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/383978Surname: EMMS. Given Name(s) or Initials: H E. Military Service Number or Last Known Location: SX6475. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 16688.228317
Item: [2016.0049.16271] "Emms, H E, SX6475
Emms, Harry Bassett, TX2810
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/383979Surname: EMMS. Given Name(s) or Initials: HARRY BASSETT. Military Service Number or Last Known Location: TX2810. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 30429.228319
Item: [2016.0049.16272] "Emms, Harry Bassett, TX2810
Emms, Herman John, TX5442
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/383980Surname: EMMS. Given Name(s) or Initials: HERMAN JOHN. Military Service Number or Last Known Location: TX5442. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 28497.228321
Item: [2016.0049.16273] "Emms, Herman John, TX5442
a bubble-based EMMS model and its application in the CFD simulation of a coal gasifier
No full text气固流化床是典型的非线性非平衡系统，呈现出复杂的时空多尺度结构。其中，气泡和团聚物是以颗粒聚集(乳化相，密相)和气体聚集(气泡相，稀相)共存为代表的两种典型多尺度结构。已有研究结果表明，耦合了基于团聚物的能量最小多尺度(EMMS)模型的双流体模拟可以准确地捕捉循环流化床内流动结构，但其中团聚物直径还存在误差，考虑到气泡关联式较成熟，能否建立基于气泡的EMMS模型呢？论文第二章首先讨论了不采用介尺度结构模型，而直接通过双流体模型(TFM)细网格模拟的情况。研究发现，对于A类颗粒，鼓泡流化床中，随着网格宽度的减小，膨胀高度降低，细网格模拟达到网格无关的值接近于实验数据；流化气速越高(如：湍动流化床和快速流化床)，达到网格无关时的网格宽度越大，但此时细网格模拟结果与实验值相差甚远，且无法捕捉S型分布。对于B、D类颗粒，结果显示，网格细化可以预测鼓泡流化床的膨胀高度，但是，当前的计算能力无法达到工业规模反应器的计算要求。为了弥补细网格模拟与实际的差距，论文第三章提出了气固鼓泡流化床中基于EMMS方法的EMMS/bubbling稳态模型，模型中以气泡代替原始EMMS模型中的团聚物作为介尺度结构，相应地，鼓泡流化床分为三个子相：乳化相、气泡相和相间相，以及相关的悬浮和耗散能量子系统，悬浮颗粒所消耗的能量趋于最小(Ns→min)的稳定性条件被用来封闭基于子相的动力学方程。初步计算结果显示，与文献中实验数据吻合。论文第四章进一步把EMMS/bubbling稳态模型扩展到非稳状态，并用来改进传统双流体模型中的曳力系数。结果发现：相比较传统的基于平均方法的曳力系数，耦合了EMMS/bubbling曳力系数的TFM模型允许用更粗网格，且准确性大大改善。 论文第五章将耦合了EMMS/bubbling模型的多流体模型(MFM)用于灰熔聚流化床气化炉模拟。连续性排料反应器模拟结果捕捉到了气化炉的主要特征，定性上预测了煤气化反应器的热态流动现象。论文最后总结了本论文获得的主要结论，展望了EMMS/bubbling模型前景以及进一步开展的 研究方向
Electro-mass olfactory multi-sensor (EMMS)
No full textFor an olfactory sensor or electronic nose, the task is not only to detect the object concentration, but also to recognize it. It is well known that all the elements can be identified by their charge to mass ratio e(+)/m. We tried to imitate this principle for molecular recognition. Two kinds of sensors are used simultaneously in testing. One is quartz crystal microbalance (QCM) for detecting the change in mass, the other is interdigital electrode (IE) for detecting the change in conduction, as an electro-mass multi-sensor (EMMS). in this paper, the principle and the feasibility of this method are discussed. The preliminary results on the recognition of alcohol by EMMS coated with lipids are presented. Meanwhile, the multi-sensor can also be used as an instrument for research on some physico-chemistry problems. The change in conduction of coated membrane caused by one absorbed molecule is reported. It is found that when a QCM is coated with membrane, it still obeys the relationship Delta F (frequency change of QCM) = K Delta m (mass change of absorbed substance) and the proportional coefficient, K, depends not only on quartz properties but also on membrane characteristics as well. (C) 2000 Elsevier Science S.A. All rights reserved.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000088378500028&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Chemistry, AnalyticalElectrochemistryInstruments & InstrumentationSCI(E)EICPCI-S(ISTP)
Multi-scale simulation of gas solid fluidization based on EMMS- DPM
No full textThis presentation will discuss some efforts to improve the speed and accuracy of discrete particle method from physical models to computational methods.
For physical model, the multiscale method is used. At global scale, the particles are distributed according to global distribution predicted by the Energy Minimization Multi-Scale (EMMS) model, so that the computation domain can be decomposed non-uniformly for load balance. At grid scale, to improve accuracy, the structure dependent drag coefficient based on the EMMS is used. At particle scale, the coarse grained method is used. The size and solids concentration of the coarse-grained particles (CGP) are determined by the cluster properties which can be predicted by the EMMS model. The coefficient of restitution is modified according to the kinetic theory of granular flows (KTGF). The method thus established in called EMMS-DPM(Lu, Xu et al. 2014).
As for computation, using system shared memory, the CFD computation on CPU is fully overlapped with particle computation on GPU. Also, the computation program is coupled with parallel visualization and control program, forming an online interactive simulation platform(Ge, Lu et al. 2015).
This method is verified by the simulation of two different CFB risers and several orders of speedup can be achieved. A methanol to orifin (MTO) process is simulated for more than 6800s. We also simulated a CFB with 30kg 0.082mm particles in 3D full loop. Furthermore, the interactive simulation platform can also be used for education and training purpose since it allows virtual experiment on computers.
REFERENCES
1.Ge, W., L. Lu, S. Liu, J. Xu, F. Chen and J. Li (2015). Multiscale Discrete Supercomputing - A Game Changer for Process Simulation? Chemical Engineering & Technology 38(4): 575-584.
2.Lu, L., J. Xu, W. Ge, Y. Yue, X. Liu and J. Li (2014). EMMS-based discrete particle method (EMMS–DPM) for simulation of gas–solid flows. Chemical Engineering Science 120(0): 67-87
Steady-state modeling of axial heterogeneity in CFB risers based on one-dimensional EMMS model
No full textAxial heterogeneity in circulating fluidized bed (CFB) risers is very important to the design of fluidized bed reactors, which is, however, still unable to be described in theory. Based on a successful description of local hydrodynamics in gas solid flow, the Energy-Minimization Multi-Scale (EMMS) theory further relates axial hydrodynamics with local and global stability conditions in the system, providing a theoretical way to account for the axial heterogeneity in CFB risers. This research reveals that the interaction between particle clusters and the dilute phase as well as the surrounding dense phase has a significant effect on their dynamical evolution. Similar to cluster diameter in the EMMS theory, number density of particle clusters serving as a comprehensive indicator to the heterogeneity in gas solid flow is constrained by both local and global stability conditions in the system. With the above cognition, a one-dimensional EMMS model is developed to perform steady-state modeling of the axial heterogeneity in CFB risers. The model successfully reproduces a complete transition zone and the parametric effects on it at the choking condition. The S-shaped axial voidage profile calculated by the one-dimensional EMMS model is in good agreement with the experimental results in gas solid fast fluidization. This research is not only the first step toward implementing the three-scale computation in virtual process engineering (VPE), but also of referential significance to industrial chemical process development. (C) 2013 Elsevier Ltd. All rights reserved
基于EMMS方法的鼓泡塔反应器CFD及群平衡模拟
No full text能量最小多尺度(energy-minimization multi-scale,EMMS)方法已经被应用于气液体系中群平衡(population balance model,PBM)模型的改进。EMMS模型可计算气泡破碎聚并过程的能量,进而获得聚并速率的修正因子。应用这一模型对高气速鼓泡塔进行了模拟计算,并进一步对比了均一尺径模型、CFD-PBM模型以及CFD-PBM-EMMS模型的模拟结果与实验数据。结果表明,在高表观气速条件下,基于EMMS方法的群平衡模型可以更加准确地预测鼓泡塔中不同高度的气泡尺径分布和轴向液速,同时提高了对整体气含率和局部气含率的模拟准确性。在表观气速为0.16 m·s~(-1)和0.25 m·s~(-1)时,CFD-PBM-EMMS模型对气泡尺径分布的预测精度更高,同时整体气含率模拟的相对误差下降为5%和15%,局部气含率模拟平均相对误差下降为8%和17%。</p
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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