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Synergistic and interference effects in coaxial mixers: Numerical analysis of the power consumption

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Chinese Journal of Chemical Engineering 2018年第4期26卷 684-694页

作者： Juan Huang gance dai School of Perfume and Aroma Technology Shanghai Institute of Technology State Key laboratory of Chemical Engineering East China University of Science and Technology

This paper is concerned with the design and application of coaxial mixers with the aid of analysis of interaction between each individual impeller. Two types of coaxial mixers pitched blade turbine(PBT)-helical ribbon(HR)and inner-outer HR operated in laminar regime were studied experimentally and numerically. The interaction implies synergistic and interference effects, which was revealed through the investigation of axial circulation rate, energy dissipation rate and power consumption. The influence factors including rotational speed ratio,rotating mode and impeller configuration were explored systematically. Quantitative analysis of power consumption involves three parameters: rate of variation in power consumption, interactive mode and ratio of power consumption. Analysis indicated that some important properties were embodied in the power *** properties are one-way and two-way interactions, critical speed ratio and dominant impeller. Finally, a new suggestion for power estimation was given.

关键词： Numerical simulation Mixing laminar flow Coaxial mixers Power consumption Interaction

COllABORATIVE DESIgN OF RFID SYSTEMS FOR MUlTI-PURPOSE SUPPlY CHAIN APPlICATIONS

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Journal of Systems Science and Systems Engineering 2013年第2期22卷 152-170页

作者： Hongyan dai Jing XU School of Business Central University of Finance and Economics Department of Industrial Engineering Tsinghua University

One of the key challenges for implementing RFID systems in supply chain management is the difficulty in economic justification. Such difficulty is further amplified by its public participation nature as multiple self-interest beneficiaries may receive diverse paybacks, and their incentives to join the system are difficult to align. This paper aims to address these problems by a collaborative design from two aspects. First, we propose to introduce a centralized planning mechanism in the chain to facilitate the participation, so that the cost of the overall system can be minimized. Second, we propose to analyze the multi-facet economic return from multi-purpose applications to achieve the full potential of RFID systems. To illustrate our approach, its application for inventory inaccuracy and product recall in RFID system is presented.

关键词： RFID collaborative design economic justification centralized planning

CeCl_3·7H_2O as an efficient catalyst for one-pot synthesis of β-amino ketones by three-component Mannich reaction

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Chinese Chemical letters 2010年第1期21卷 31-34页

作者： Yan dai[a], Bin Dong li[a], Heng Dao Quan[b] Chun Xu lü[a] [a]School of Chemical Engineering Nanjing University of Science Technology Nanjing 210094 China [b]National Institute of Advanced Industrial Science Technology Ibaraki 3058565 Japan

Cerium trichloride heptahydrate(CeCl_3·7H_2O) was found to be an efficient and recyclable catalyst for the three-component direct Mannich reaction of anilines and benzaldehydes with *** protocol has advantages of hig... 详细信息

关键词： Cerium trichloride heptahydrate Mannich reaction β-Amino ketones lewis acid

Nonlinear dynamical behavior of Xenon atoms along dislocation lines in UO_(2+x) nuclear fuel

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Science China(Physics,Mechanics & Astronomy) 2015年第5期58卷 82-87页

作者： SUI PengFei dai ZhenHong Institute of Opto-electronic Information Science and Technology Yantai University

Experimental results showed that there are a few Xenon atom bubbles connected by the dislocation line in the UO2+x nuclear fuel, and the largest radius of bubbles is about 45 nm. This phenomenon is in contrast to traditional bubble formation mechanism. This phenomenon is very important in understanding the properties of nuclear fuel. In this work, we apply a time- dependent microscopic atom transport equation and take into account stress coherent potential in the boundary of the dislocation. Using the equation, we numerically solved the stress coherence effect and studied the transfer properties of Xenon atoms along the dislocation line. Our numerical results show that the transport of the Xenon atoms along the dislocation changes nonlinearly with the external driving energy, and reaches at the saturation values. It explains the growth limit of Xenon atom bubbles that is in agreement with the experiment results.

关键词： nonlinear atom transport dislocation line nuclear fuel

PRECONDITIONINg BlOCK lANCZOS AlgORITHM FOR SOlVINg SYMMETRIC EIgENVAlUE PROBlEMS

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Journal of Computational Mathematics 2000年第4期18卷 365-374页

作者： Hua dai Peter lancaster Nanjing University of Aeronautics and Astronautics Naming210018China University of Calgary CalgaryCanada

A preconditioned iterative method for computing a few eigenpairs of large sparse symmetric matrices is presented in this paper. The proposed method which combines the preconditioning techniques with the efficiency of block lanczos algorithm is suitable for determination of the extreme eigenvalues as well as their multiplicities. The global convergence and the asymptotically quadratic convergence of the new method are also demonstrated. [ABSTRACT FROM AUTHOR]

关键词： eigenvalue eigenvector sparse matrices lanczos method preconditioning

Angular Distribution of Electrons Following Photoionization of n'sns ^(1)S_(0) Rydberg States in the Alkaline-Earth Atoms

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Chinese Physics letters 1994年第9期11卷 529-532页

作者： dai Changjian Department of Physics Zhejiang UniversityHangzhou 310027

A new characterization of the angular distribution of electron ejected from n'pns autoionizing states in the alkaline-earth atoms has been carried out from the most general expression of differential cross section of *** same approach may be extended to more complicated cases where the traditional treatment becomes *** comparison between the two methods is presented.

关键词： absorption. Electron Rydberg

Multiple air route crossing waypoints optimization via artificial potential field method

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Chinese Journal of Aeronautics 2021年第4期34卷 279-292页

作者： Bizhao PANg Wei dai Xinting HU Fuqing dai Kin Huat lOW School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore Air Traffic Management Research Institute Nanyang Technological UniversitySingapore 637460Singapore School of Air Traffic Management Civil Aviation University of ChinaTianjin 300300China

Air route crossing waypoint optimization is one of the effective ways to improve airspace utilization,capacity and resilience in dealing with air traffic congestion and ***,research is lacking on the optimization of multiple Crossing Waypoints(CWPs)in the fragmented airspace separated by Prohibited,Restricted and Dangerous areas(PRDs).To tackle this issue,this paper proposes an Artificial Potential Field(APF)model considering attractive forces produced by the optimal routes and repulsive forces generated by *** optimization framework based on the APF model is proposed to optimize the different airspace topologies varying the number of CWPs,air route segments and *** on the framework,an adaptive method is developed to dynamically control the optimization process in minimizing the total air route *** proposed model is applied to a busy controlled *** the obtained results show that after optimization the safety-related indicators:conflict number and controller workload reduced by 7.75%and 6.51%*** for the cost-effectiveness indicators:total route length,total air route cost and non-linear coefficient,declined by 1.74%,3.13%and 1.70%*** the predictability indicator,total flight delay,saw a notable reduction by 7.96%.The proposed framework and methodology can also provide an insight in the understanding of the optimization to other network systems.

关键词： Adaptive method Air route network Air traffic control Potential field Structure optimization

Reliability index algorithm of a sub-domain interconnection large communication network

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Journal of Systems Engineering and Electronics 2010年第2期21卷 339-348页

作者： Fusheng dai Aijun liu College of Information Engineering Harbin Institute of Technology (Welhai Campus) Weihai 264209 P. R. China

The normalized weighted capacity reliability index of a sub-domain interconnection large scale communication network is defined and a new algorithm to calculate the reliability index is proposed, The proposed algorithm can be performed using logical or algebraic operation by means of computer-aided programming and the correctness of each key step is validated in detail. This paper takes the sub-domain interconnection symmetrical topologi- cal network for a typical example to calculate the network reliability index and verifies the correctness of the proposed algorithm us- ing the real measured statistical data. The real measured results are well in accordance with the results obtained by the proposed algorithm. The result shows that the proposed algorithm is a valid means to estimate the reliability index of a sub-domain intercon- nection large-scale communication network.

关键词： communication network reliability sub-domain inter- connection transmission capacity.

Onset and Direction of Shear Banding Instability in Metallic glasses

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Journal of Materials Science & Technology 2014年第6期30卷 616-621页

作者： Yan Chen lanhong dai State Key laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences

The shear banding instability occurs as the homogenous deformation in metallic glasses （Mgs） develops to a critical point, at which the discontinuity in deformation rate is incipient across nano-scale shear bands. When and where the shear instability takes place is an important issue for understanding the shear band origin. However, such condition and direction of shear localization concerning the unique properties of Mgs is still lacking for general stress state. In this paper, a new constitutive is introduced for Mgs accounting for the pressure sensitivity, dilatancy and structural evolution; the shear banding is regarded as the appearance of instability in the constitutive description of inelastic deformation. Tying the bifurcation theory to the new constitutive, the general condition of deformation localization is derived. The shear band orientation corresponding to the easiest direction of shear instability is then obtained in dependence on pressure sensitivity, dilatancy and Poisson＇s ratio for Mgs. The range of the predicted shear band angles is consistent with the experimental observations.

关键词： Metallic glasses Shear banding instability Bifurcation