Explanipedia

Analysis and verification on multi-DOF optical path sensitivity of an off-axis four-mirror telescope Open

Sijun Fang, Jian Luo, Xinyu Li, Qicheng Sun, Hongwen Hai , et al. · 2025

The structural stability of the optical system in an off-axis four-mirror space telescope is critical to maintaining its optical performance and avoiding potential system failure. Structural deformation can cause variations of the optical …

Analysis of the effect of coupling coefficients on the slope of PDH-locked frequency discriminator Open

Qicheng Sun, Hongwen Hai, Ru‐Wen Peng, Sijun Fang, Rui Zhang , et al. · 2025

The effects of the coupling coefficients on the reflected field and the error signal under various misalignments and near-axis conditions are analyzed, and some basic features of the error signal are investigated. According to the definiti…

Research on High-Stability Composite Control Methods for Telescope Pointing Systems under Multiple Disturbances Open

Rui Zhang, Kai Zhao, Sijun Fang, Wentong Fan, Hongwen Hai , et al. · 2024

During the operation of space gravitational wave detectors, the constellation configuration formed by three satellites gradually deviates from the ideal 60° angle due to the periodic variations in orbits. To ensure the stability of inter-s…

An Analysis of Shenzhen Talent Housing Policies Based on The Model of Public-Value Failure Open

Qicheng Sun, Zhuyijia Yuan, Jinhan Zheng · 2023

Shenzhen, the emerging economic center of Southeast China, is facing a transition that the talents are pivotal to achieve the goal of sustainable development. In this case, college graduates’ settlement at Shenzhen is hampered by a series …

2T1C DRAM based on semiconducting MoS<sub>2</sub> and semimetallic graphene for in-memory computing Open

Saifei Gou, Yin Wang, Xiangqi Dong, Zihan Xu, Xinyu Wang , et al. · 2023

In-memory computing is an alternative method to effectively accelerate the massive data-computing tasks of artificial intelligence (AI) and break the memory wall. In this work, we propose a 2T1C DRAM structure for in-memory computing. It i…

Prediction of segregation characterization based on granular velocity and concentration in rotating drum Open

Wenzheng Xiu, Ra Li, Quan Chen, Qicheng Sun, Vladimir Živković , et al. · 2022

In a binary granular system composed of two types of particles with different granule sizes and the same density, particle sorting occurs easily during the flow process. The segregation pattern structure is mainly affected by the granular …

Experimental study on bulk modulus and dissipation of dry and wet granular samples under vertical vibration Open

Qingxin Du, Qicheng Sun, Hongsheng Ding, Guo‐Hua Zhang, Yanli Fan , et al. · 2022

Dry granular materials are composed of a dense random packing of macroscopic grains. As a small amount of liquid is added to granular samples, the liquid bridge forces, i.e. the forces between liquid and the grains, have an influence on th…

Wetting equilibrium in a rectangular channel Open

Yu Tian, Qicheng Sun, Chen Zhao, Jiajia Zhou, Masao Doi · 2020

Wetting in a nearly rectangular channel.

Lattice Boltzmann-Discrete Element Modeling Simulation of SCC Flowing Process for Rock-Filled Concrete Open

Songgui Chen, Chuan-Hu Zhang, Feng Jin, Peng Cao, Qicheng Sun , et al. · 2019

Since invented in 2003, rock-filled concrete (RFC) has gained much attention and has been successfully applied in more and more civil and hydraulic projects in China. This study developed a numerical framework to simulate self-compacting c…

Study on the particle breakage of ballast based on a GPU accelerated discrete element method Open

Guangyu Liu, Wen-Jie Xu, Qicheng Sun, N. Govender · 2019

An improved wavelet analytical method for studying particle dynamics of the passive layer within a granular drum Open

Shihang Mou, Hui Yang, Ran Li, Bide Wang, Qicheng Sun , et al. · 2019

In this study, conventional threshold way has many defects, for example, the way of extraction of signal processing for the <δν 2 > and experimental statistics depend on several subjective criteria during the analysis process. Therefore, w…

Measurements of solid volume fraction and granular temperature at granular avalanches in a drum Open

Quan Chen, Hui Yang, Ran Li, Han Ren, Qicheng Sun · 2018

A granular flow in the drum has high heat exchange efficiency and mixing efficiency, and is widely used in industrial productions. Accurately describing the flow properties is extremely important for industrial production. In this work, an…

Numerical study of a sphere descending along an inclined slope in a liquid Open

Chuanhu Zhang, Kenichi Soga, Krishna Kumar, Qicheng Sun, Feng Jin · 2017

Numerical study of a sphere descending along an inclined slope in a liquid Open

Chuanhu Zhang, Kenichi Soga, Krishna Kumar, Qicheng Sun, Feng Jin · 2017

The descending process of a sphere rolling and/or sliding along an inclined slope in a liquid involves interactions between the hydrodynamic forces on the sphere and the contact forces between the sphere and the plane. In this study, the d…

Numerical study on acoustic behavior of two-dimensional granular system Open

Xiaoyu Liu, Guo‐Hua Zhang, Qicheng Sun, Zhao Xue-Dan, Shang Liu · 2017

数值测量了卸载过程中二维单分散圆盘颗粒系统的横波、纵波声速、声衰减系数、非线性系数随压强的变化以及声衰减系数随频率的变化.结果表明，二维（2D）圆盘颗粒体系的横波、纵波声速均随压强呈分段幂律标度：当压强P -4时，横波、纵波声速随压强的增大而减小；当P > 10-4时，有vt～ P0.202，vl～ P0.338.进一步得到其剪切模量和体积模量的比值G/B也随压强呈幂律标度，G/B ～ P-0.502，暗示在低压强下，与三维（3D）球形颗粒体系类似，2D圆盘颗粒体系也处于L…

Multi-scale Modelling of Granular Pile Collapse by Using Material Point Method and Discrete Element Method Open

Chuanqi Liu, Qicheng Sun, Yi Yang · 2017

Granular debris flows are often observed in mountainous areas in Southwestern China. The process is accompanied with large deformation and the evident transitions between solid- and fluid-like states bring difficulties in proposing a unifi…

Simulation of size segregation in granular flow with material point method Open

Minglong Fei, Qicheng Sun, K. M. Hill, Gordon G. D. Zhou · 2017

\nSegregation is common in granular flows consisting of mixtures of particles differing in size or density. In gravity-driven flows, both gradients in total pressure (induced by gravity) and gradients in velocity fluctuation fields (often …

Measurements of velocity and pressure of a collapsing granular pile Open

Xiaorong Xu, Qicheng Sun, Feng Jin, Yanpei Chen · 2016

Analysis of elastic energy relaxation process for granular materials at quasi-static state Open

Xinxin Jin, Feng Jin, Ning Liu, Qicheng Sun · 2016

The granular system has complicated force chain network and multiple relaxation mechanisms. The different relaxation mechanisms have largely effects on others. The force chains divide the whole system into many soft zones which dominate th…

Three-dimensional simulations of Bingham plastic flows with the multiple-relaxation-time lattice Boltzmann model Open

Songgui Chen, Chuan-Hu Zhang, Y.T. Feng, Qicheng Sun, Feng Jin · 2016

This paper presents a three-dimensional (3D) parallel multiple-relaxation-time lattice Boltzmann model (MRT-LBM) for Bingham plastics which overcomes numerical instabilities in the simulation of non-Newtonian fluids for the Bhatnagar–Gross…

Vibrational density of states and boson peak in two-dimensional frictional granular assemblies Open

Niu Xiao-Na, Guo‐Hua Zhang, Qicheng Sun, Zhao Xue-Dan, Dong Yuan-Xiang · 2016

In this paper, the two-dimensional granular assemblies composed of 2048 mono-dispersed frictional disks are simulated by the discrete element method. A set of eigenvalues and corresponding eigenvectors is obtained by diagonalizing the Hess…

On granular elasticity Open

Qicheng Sun, Feng Jin, Guangqian Wang, Shixiong Song, Guo‐Hua Zhang · 2015

Relaxation of granular elasticity Open

Qicheng Sun, Chuanqi Liu, Gordon G. D. Zhou · 2015

In granular materials, particles constitute a complex force chains network through contact with each other, and elastic energies are stored due to deformation of particles. This elastic behavior is macroscopic manifestation of inter-partic…

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