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Rotating electroosmotic flow of an Eyring fluid

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Acta Mechanica Sinica 2017年第2期33卷 295-315页

作者： cheng qi Chiu-On Ng Department of Mechanical Engineering The University of Hong Kong Hong Kong China

A perturbation analysis is presented in this paper for the electroosmotic (EO) flow of an Eyring fluid through a wide rectangular microchannel that rotates about an axis perpendicular to its own. Mildly shear-thinning rheology is assumed such that at the leading order the problem reduces to that of Newtonian EO flow in a rotating channel, while the shear thinning effect shows up in a higher-order problem. Using the relaxation time as the small ordering parameter, analytical solutions are deduced for the leading- as well as first-order problems in terms of the dimensionless Debye and rotation parameters. The velocity profiles of the Ekman-electric double layer (EDL) layer, which is the boundary layer that arises when the Ekman layer and the EDL are comparably thin, are also deduced for an Eyring fluid. It is shown that the present perturbation model can yield results that are close to the exact solutions even when the ordering parameter is as large as order unity. By this order of the relaxation time parameter, the enhancing effect on the rotating EO flow due to shear-thinning Eyring rheology can be significant.

关键词： Electroosmotic flow Eyring fluid Rotating channel

A faster method to compute primitive elements and discrete logarithms of factor base in Artin-Schreier extensions

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Science China(Information Sciences) 2019年第9期62卷 214-216页

作者： Dianyan XIAO qi cheng Institute for Advanced Study Tsinghua University School of Computer Science University of Oklahoma

Dear editor,The discrete logarithm problem is a classical problem in mathematics and widely used in cryptography [1–4]. The pre-computation of discrete logarithms of factor base is a crucial and extremely expensive s... 详细信息

关键词： A faster method to compute primitive elements and discrete logarithms of factor base in Artin-Schreier extensions

Soft Sensing Modelling Based on Optimal Selection of Secondary Variables and Its Application

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International Journal of Automation and computing 2009年第4期6卷 379-384页

作者： qi Li cheng Shao Institute of Advanced Control Technology Dalian University of Technology Dalian 116024 PRC

The composition of the distillation column is a very important quality value in refineries, unfortunately, few hardware sensors are available on-line to measure the distillation compositions. In this paper, a novel method using sensitivity matrix analysis and kernel ridge regression （KRR） to implement on-line soft sensing of distillation compositions is proposed. In this approach, the sensitivity matrix analysis is presented to select the most suitable secondary variables to be used as the soft sensor＇s input. The KRR is used to build the composition soft sensor. Application to a simulated distillation column demonstrates the effectiveness of the method.

关键词： Distillation column sensitivity matrix analysis ridge regression kernel ridge regression (KRR) soft sensor

Logic and logic-based control

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控制理论与应用（英文版） 2008年第1期6卷 26-36页

作者： Hongsheng qi Daizhan cheng Institute of Systems Science Chinese Academy of Sciences Beijing 100080 China

This paper gives a matrix expression of logic. Under the matrix expression, a general description of the logical operators is proposed. Using the semi-tensor product of matrices, the proofs of logical equivalences, implications, etc., can be simplified a lot. Certain general properties are revealed. Then, based on matrix expression, the logical operators are extended to multi-valued logic, which provides a foundation for fuzzy logical inference. Finally, we propose a new type of logic, called mix-valued logic, and a new design technique, called logic-based fuzzy control. They provide a numerically computable framework for the application of fuzzy logic for the control of fuzzy systems.

关键词： Semi-tensor product Matrix expression of logic Mix-valued logic Logic-based fuzzy control

Passive Control of Flow-Induced Vibration(FIV)by Helical Strakes for Two Staggered Flexible Cylinders

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China Ocean Engineering 2021年第4期35卷 475-489页

作者： XU Wan-hai WANG qi-cheng qiN Wen-qi DU Zun-feng State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China CIMC Offshore Co.Ltd Shenzhen 518000China

Helical strake is a widely-used device for passive flow-induced vibration(FIV)control of cylindrical *** is omnidirectional and can effectively reduce FIV response *** on the passive FIV control for cylindrical structures are mainly concerned with a single isolated cylinder,while the influence of wake interference between multiple cylinders on FIV suppression devices is less considered up to *** engineering applications,multiple flexible cylinders with large aspect ratios can be subjected to complex flow forces,and the effects of wake interference are *** FIV suppression effect of helical strake of a common configuration(17.5D pitch and 0.25D height,where D is the cylinder diameter)in two staggered cylinders system is still *** paper systematically studied the FIV response of multiple cylinders system fitted with the helical strakes by model *** relative spatial position of the two cylinders is fixed at S=3.0D and T=8.0D,which ensures the cylindrical structures in the flow interference *** experimental results show that the helical strakes effectively reduce the FIV response on staggered upstream cylinder,and the suppression efficiency is barely affected by the smooth or straked downstream *** corresponding FIV suppression efficiency on the downstream cylinder is remarkably reduced by the influence of the upstream wake *** wake-induced vibration(WIV)phenomenon is not observed on the staggered downstream cylinder,which normally occurs on the downstream straked cylinder in a tandem arrangement.

关键词： flow-induced vibration(FIV) passive control helical strakes flexible cylinders staggered arrangement

Critical Scaling Behaviors of Entanglement Spectra

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Chinese Physics Letters 2020年第1期37卷 1-5页

作者： qi-cheng Tang Wei Zhu School of Science Westlake UniversityHangzhou 3100242 Institute of Natural Sciences Westlake Institute of Advanced StudyHangzhou 310024

We investigate the evolution of entanglement spectra under a global quantum quench from a short-range correlated state to the quantum critical *** by the conformal mapping,we find that the dynamical entanglement spectra demonstrate distinct finite-size scaling behaviors from the static *** a prototypical example,we compute real-time dynamics of the eritanglement spectra of a one-dimensional transverse-field Ising *** simulation confirms that the entanglement spectra scale with the subsystem size I as for the dynamical equilibrium state,much faster thanαIn^-1 l for the critical ground *** particular,as a byproduct,the entanglement spectra at the long time limit faithfully gives universal tower structure of underlying Ising criticality,which shows the emergence of operator-state correspondence in the quantum dynamics.

关键词： dynamics. quantum angle

Top-down Modulation of Outcome Processing in Primary Sensory Cortex for Flexible Behavior

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Neuroscience Bulletin 2021年第6期37卷 889-891页

作者： qi cheng chengyu T.Li Institute of Neuroscience State Key Laboratory of NeuroscienceChinese Academy of SciencesCAS Center for Excellence in Brain Science and Intelligence TechnologyShanghai Center for Brain Science and Brain-Inspired TechnologyShanghai 200031China School of Future Technology University of the Chinese Academy of SciencesBeijing 100049China

Adaptive behaviors are critical for survival in changing *** you are choosing between a hamburger and sparkling *** brain would assign higher value to hamburger when you are hungry and to water when you are *** example is the driving direction in England and China,which is different between those two *** does the brain respond to the same stimulus under different contexts to guide distinct behavioral decisions?

关键词： Cortex Primary driving

A Pair Correlation Function Characterizing the Anisotropy of Force Networks

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Chinese Physics Letters 2011年第6期28卷 176-178页

作者： SUN qi-cheng JI Shun-Ying State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing 100084 State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116023

Force networks may underlie the constitutive relations among granular solids and granular flows and inter-state ***,it is difficult to effectively describe the anisotropy of force *** propose a new pair correlation function g(r,θ)to describe the characteristic lengths and orientations of force chains that are composed of particles with contact forces greater than the threshold values.A formulation g(r,θ)≈a(r)+b(r)cos2(θ−π/2)is used to fit the g(r,θ)*** characteristic lengths and orientations of force networks are then elucidated.

关键词： networks characteristic anisotropy

Sumoylation of Human Parainfluenza Virus Type 3 Phosphoprotein Correlates with A Reduction in Viral Replication

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Virologica Sinica 2021年第3期36卷 438-448页

作者： qi cheng Wenjing Huai Xiaoyan Wu Mingzhou Chen State Key Laboratory of Virology Modem Virology Research CenterCollege of Life SciencesWuhan UniversityWuhan 430072China

Human parainfluenza virus type 3(HPIV3), a member of the Paramyxoviridae family, can cause lower respiratory disease in infants and young children. The phosphoprotein(P) of HPIV3 is an essential cofactor of the viral RNA-dependent RNA polymerase large protein(L). P connects nucleocapsid protein(N) with L to initiate genome transcription and *** influences many important pathways of the target proteins, and many viral proteins are also themselves sumoylated. In this study, we found that the P of HPIV3 could be sumoylated, and mutation of K492 and K532 to arginine(PK492 R/K532 R) failed to be sumoylated within P, which enhances HPIV3 minigenome activity. Biochemical studies showed that PK492 R/K532 Rhad no effect on its interactions with N, formation of homo-tetramers and formation of inclusion ***, we found that incorporation of K492 R/K532 R into a recombinant HPIV3(rHPIV3-PK492 R/K532 R) increased viral production in culture cells, suggesting that sumoylation attenuates functions of P and down-regulates viral replication.

关键词： Human parainfluenza virus type 3(HPIV3) Phosphoprotein Sumoylation Replication Viral replication