Search results for: Yuguang Chen

Items from 1 to 20 out of 25 results

article

Spin transport properties in a non-uniform quantum wire modulated by both Rashba and Dresselhaus spin–orbit couplings

Zhonghui Xu, Weishuai Lv, Mansoor B.A. Jalil, Jinsong Huang, more

Physics Letters A > 2018 > 382 > 39 > 2868-2875

Spin transport properties in a non-uniform quantum wire (QW) in the presence of both the Rashba and Dresselhaus spin–orbit couplings (SOCs) is investigated by using the non-equilibrium Green's function (NEGF) method combined with the Landauer Büttiker formalism. It is found that such a non-uniform quantum wire exhibits considerable spin polarization in its conductance in the influence of both the...

article

Epitaxial growth of horizontally aligned single-crystal arrays of perovskite

Yitan Li, Yuguang Chen, Lu Han, Xuemei Li, more

Science China Materials > 2019 > 62 > 1 > 59-64

Well-aligned single-crystal nanowire arrays of CH₃NH₃PbI₃ have shown potentials in laser sources and photovoltaic applications. Here we developed a solution based epitaxial method to grow CH₃NH₃PbI₃ nanowire arrays. By confining the precursor solution between a silicon wafer and ST-cut quartz, the evaporation rate of the solvent was slowed down which brings a more stable and controllable solution...

article

Confined-solution process for high-quality CH₃NH₃PbBr₃ single crystals with controllable morphologies

Yitan Li, Lu Han, Qiao Liu, Wei Wang, more

Nano Research > 2018 > 11 > 6 > 3306-3312

Solution processes have shown excellent potential for application to the growth of single-crystal materials. We have developed a confined-solution method for the preparation of single crystals with a controlled morphology. By confining the precursor solution within a micrometer-thick cavity and then controlling the saturation by adjusting the temperature gradient and fluid flow, high-quality CH₃NH...

article

Neurophysiological monitoring of lumbar spinal nerve roots: A case report of postoperative deficit and literature review

Yuguang Chen, Baoqing P. Wang, Junlin Yang, Yaolong Deng

International Journal of Surgery Case Reports > 2017 > 30 > C > 218-221

Intraoperative neurophysiological monitoring (IONM) has proven to help reduce the probability of postoperative neurological deficit for spinal deformity correctional surgeries. However, in rare cases new deficits may still happen. We report a surgical case in which the patient had postoperative paralysis. We would like to call for more case reports with postoperative neurological deficits as they...

chapter

Density difference-based variable speed limit control for expressways under rainfall conditions

Yuguang Chen, Jianming Lei, Wei Cheng, Linyong Su, more

2016 12th World Congress on Intelligent Control and Automation (WCICA) > 2913 - 2917

2016 12th World Congress on Intelligent Control and Automation (WCICA)

In order to effectively respond to potential traffic dangers caused by high speed discreteness and uneven density distribution of expressways under rainfall conditions and achieve the goals of smoothing traffic flow, ensuring safe travel and reducing traffic congestion, a density difference-based variable speed limit control model for expressways under rainfall conditions was built in this paper to...

chapter

Coordinated traffic signal control method of urban expressway on-ramp and ground intersections

Yuguang Chen, Manrong Yuan, Wei Cheng, Haicheng Xiao, more

2016 12th World Congress on Intelligent Control and Automation (WCICA) > 3367 - 3370

2016 12th World Congress on Intelligent Control and Automation (WCICA)

In view of the major cause for traffic congestion on urban expressways and based on the in-depth analysis and comparison of plenty of related research at home and abroad, the analysis on on-ramp metering and metering threshold calibration in the study area was conducted to establish a traffic flow and traffic signal control model with the road network area from Jinma Overpass to Dashuying Overpass...

chapter

Assessment of Uncertainty in Reservoir Production Forecasts Using Upscaled Flow Models

Ole Petter Lødøen, Henning Omre, Louis J. Durlofsky, Yuguang Chen

Quantitative Geology and Geostatistics > Geostatistics Banff 2004 > Petroleum > 713-722

Production forecasts for a given reservoir, with associated uncertainties, must be based on a stochastic model of the reservoir coupled with a fluid flow simulator. These flow simulations may be computationally prohibitive if they are performed on the fine scale geostatistical model. To accelerate these computations, coarsened (or upscaled) reservoir models are generally simulated. The recovery predictions...

article

A coarse-scale compositional model

Alireza Iranshahr, Yuguang Chen, Denis V. Voskov

Computational Geosciences > 2014 > 18 > 5 > 797-815

In subsurface flow modeling, compositional simulation is often required to model complex recovery processes, such as gas/CO ₂ injection. However, compositional simulation on fine-scale geological models is still computationally expensive and even prohibitive. Most existing upscaling techniques focus on black-oil models. In this paper, we present a general framework to upscale two-phase multicomponent...

article

Development and application of near-well multiphase upscaling for forecasting of heavy oil primary production

Hangyu Li, Yuguang Chen, Danny Rojas, Mridul Kumar

Journal of Petroleum Science and Engineering > 2014 > 113 > Complete > 81-96

Near-well effects can have a strong impact on reservoir flow. Current reservoir modeling practice often uses coarse-scale flow simulation models, which may lead to biased results, compared with fine-scale models. In this work, we extend and apply a recently developed near-well multiphase flow upscaling technique to the coarse-scale simulation of heavy-oil primary production. For heavy oils, oil viscosity...

article

Dynamics study of the recombination of polaron pairs in polymer chain with impurities

Qing Lu, Hui Zhao, Yuguang Chen, Yonghong Yan

Physica B: Physics of Condensed Matter > 2013 > 421 > Complete > 13-17

Within a Su–Schrieffer–Heeger model modified to include an external electric field, the dynamical process of oppositely charged polarons in a polymer chain is simulated by using a non-adiabatic evolution method. It is found that the polaron pair can combine with neutral exciton in the presence of a weak electric field, and the field requirement for achieving exciton is very strict in a pure polymer...

article

Time-of-flight (TOF)-based two-phase upscaling for subsurface flow and transport

Yuguang Chen, Yan Li, Yalchin Efendiev

Advances in Water Resources > 2013 > 54 > Complete > 119-132

Subsurface formations are characterized by heterogeneity over multiple length scales, which can have a strong impact on flow and transport. In this paper, we present a new upscaling approach, based on time-of-flight (TOF), to generate upscaled two-phase flow functions. The method focuses on more accurate representations of local saturation boundary conditions, which are found to have a dominant impact...

article

Spin polarization direction switch based on an asymmetrical quantum wire

Zhonghui Xu, Xianbo Xiao, Yuguang Chen

Physics Letters A > 2013 > 377 > 5 > 412-416

A scheme for a spin polarization direction switch is investigated by studying the spin-dependent electron transport of an asymmetrical quantum wire with Rashba spin–orbit coupling. It is found that the spin polarization direction can be switched by changing the direction of the external current. The physical mechanism of this device arises from the fact that the symmetries in the longitudinal and...

article

Improving successful rate of transcranial electrical motor-evoked potentials monitoring during spinal surgery in young children

Junlin Yang, Zifang Huang, Haihua Shu, Yuguang Chen, more

European Spine Journal > 2012 > 21 > 5 > 980-984

Introduction This prospective study was to investigate the successful rate of intraoperative motor evoked potentials (MEP) monitoring for children (<12 years old) with congenital scoliosis. Materials and methods A consecutive series of 27 young children (7 girls and 20 boys; from 1 to 11 years old) between September 2007 and November 2009, were enrolled to this study. 12 patients received general...

article

A multi-resolution workflow to generate high-resolution models constrained to dynamic data

Céline Scheidt, Jef Caers, Yuguang Chen, Louis J. Durlofsky

Computational Geosciences > 2011 > 15 > 3 > 545-563

Distance-based stochastic techniques have recently emerged in the context of ensemble modeling, in particular for history matching, model selection and uncertainty quantification. Starting with an initial ensemble of realizations, a distance between any two models is defined. This distance is defined such that the objective of the study is incorporated into the geological modeling process, thereby...

article

Statistical assignment of upscaled flow functions for an ensemble of geological models

Yuguang Chen, Kwangwon Park, Louis J. Durlofsky

Computational Geosciences > 2011 > 15 > 1 > 35-51

Upscaled flow functions are often needed to account for the effects of fine-scale permeability heterogeneity in coarse-scale simulation models. We present procedures in which the required coarse-scale flow functions are statistically assigned to an ensemble of upscaled geological models. This can be viewed as an extension and further development of a recently developed ensemble level upscaling (EnLU)...

article

Magnetoelastic instability in Ising-like models

Pengfei Li, Yuguang Chen

Physics Letters A > 2010 > 374 > 3 > 453-456

The magnetoelastic instability in nanostructured ring-shaped Ising-like spin 1/2 model has been investigated by using the exact diagonalization method. It is found that there exists two critical anisotropy parameters Δc(1) and Δc(2) (Δc(1)<Δc(2)) in the phase diagram. As the anisotropy parameter Δ>Δc(2), the magnetoelastic transition from dimerized phase to uniform phase is a first order transition...

article

Spin filtering in a nonuniform quantum wire with Rashba spin–orbit interaction

Xianbo Xiao, Xiaomao Li, Yuguang Chen

Physics Letters A > 2009 > 373 > 48 > 4489-4492

We investigate theoretically the spin-polarized electron transport for a wide-narrow-wide (WNW) quantum wire under the modulation of Rashba spin–orbit interaction (SOI). The influence of both the structure of the quantum wire and the interference between different pairs of subbands on the spin-polarized electron transport is taken into account simultaneously via the spin-resolved lattice Green function...

chapter

Traffic State Identification Methods Based on Vague Sets

Xiaofeng Ji, Wei Cheng, Yuguang Chen

2009 International Conference on Computational Intelligence and Software Engineering > 1 - 4

2009 International Conference on Computational Intelligence and Software Engineering

In order to identify traffic state of road section and provide decision support for traffic management, a method was proposed for road section traffic state identification based on vague sets. The traffic state decision matrix was constructed, and then the identification steps for road section traffic state were given in detail. Then the knowledge acquisition method of regional road network traffic...

chapter

Study on self- adapting control based on immune neural network for a car-engine

Yuguang Chen, Xin Li, Wei Qian, Shili Liao

2008 7th World Congress on Intelligent Control and Automation > 6933 - 6936

2008 7th World Congress on Intelligent Control and Automation

Because the parameters of a car-engine are of the discreteness, nonlinear and uncertain characteristics, it is hard to control accurately the excess air coefficient and the spark advance angle in dynamic procedure. A self-adapting control based on immune neural network was proposed. It absorbs well the advantages both off-line optimization of the fuzzy control parameters on genetic arithmetic and...

chapter

Multimode information collection based on in-vehicle network

Yuguang Chen, Miao Yu, Hai Shi, Wenjie Feng, more

2008 7th World Congress on Intelligent Control and Automation > 6929 - 6932

2008 7th World Congress on Intelligent Control and Automation

A method of multimode information collection based on in-vehicle network was introduced aiming at the problems that existing information measure methods of automobile are difficult to satisfy the need on measure precision, steady state and dynamic response at the same time, and the controllers are difficult to share information resources. It centralized collects automobile information based on FlexRay...

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INFONA - science communication portal

Search results for: Yuguang Chen

Spin transport properties in a non-uniform quantum wire modulated by both Rashba and Dresselhaus spin–orbit couplings

Epitaxial growth of horizontally aligned single-crystal arrays of perovskite

Confined-solution process for high-quality CH₃NH₃PbBr₃ single crystals with controllable morphologies

Neurophysiological monitoring of lumbar spinal nerve roots: A case report of postoperative deficit and literature review

Density difference-based variable speed limit control for expressways under rainfall conditions

Coordinated traffic signal control method of urban expressway on-ramp and ground intersections

Assessment of Uncertainty in Reservoir Production Forecasts Using Upscaled Flow Models

A coarse-scale compositional model

Development and application of near-well multiphase upscaling for forecasting of heavy oil primary production

Dynamics study of the recombination of polaron pairs in polymer chain with impurities

Time-of-flight (TOF)-based two-phase upscaling for subsurface flow and transport

Spin polarization direction switch based on an asymmetrical quantum wire

Improving successful rate of transcranial electrical motor-evoked potentials monitoring during spinal surgery in young children

A multi-resolution workflow to generate high-resolution models constrained to dynamic data

Statistical assignment of upscaled flow functions for an ensemble of geological models

Magnetoelastic instability in Ising-like models

Spin filtering in a nonuniform quantum wire with Rashba spin–orbit interaction

Traffic State Identification Methods Based on Vague Sets

Study on self- adapting control based on immune neural network for a car-engine

Multimode information collection based on in-vehicle network

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