Article
Engineering, Geological
Huicong An, Chaojun Ouyang, Fulei Wang, Qingsong Xu, Dongpo Wang, Weibin Yang, Tianzhen Fan
Summary: In this study, a large debris flow that occurred in the Meilong catchment was comprehensively analyzed through field observation, image interpretation, and laboratory experiments. A sequential integrated numerical model was developed to simulate the entire process of the debris flow, and the computational outcomes matched well with the field observation results. The proposed integrated model, combined with spatially varying parameters, can effectively describe the characteristics of debris flow initiation and propagation stages, providing significant insights into the physical processes involved in such hazards.
ENGINEERING GEOLOGY
(2022)
Article
Chemistry, Physical
Zebo Huang, Anle Mu, Longxing Wu, Hang Wang, Yongjun Zhang
Summary: A new spiral flow field is proposed to improve the uniformity of electrolyte flow and alleviate local concentration polarization in VRFB. Despite the lower system efficiency due to long flow channels and large pressure drop, the coulombic efficiency, voltage efficiency, and energy efficiency are significantly better than traditional flow fields, making the novel flow field advantageous for small stack applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Chunbo Wu, Shuai Yue, Wenhui Shi, Mengsheng Li, Zhonghua Du, Zhi Liu
Summary: This paper aims to study the penetration effect of harpoons on space debris to solve the increasingly serious space debris problem. Through designing a harpoon system, establishing finite element models, and conducting validation experiments, the research results provide guidance for active space debris removal technology.
Article
Geosciences, Multidisciplinary
Shufeng Tian, Guisheng Hu, Ningsheng Chen, Mahfuzur Rahman, Zheng Han, Marcelo Somos-Valenzuela, Jules Maurice Habumugisha
Summary: This study investigates the formation of low-frequency debris flows and their generation by high-frequency light rainfall using the case of the 2014 event in the Erkazi gully in Sichuan Province, China. The research reveals the predominant role of soil mass and geological factors in the formation and amplification of debris flows. The study also highlights the importance of community-based warning systems in debris flow disasters.
Article
Engineering, Civil
Zhenqing Liu, Yiwen Cao, Bowen Yan, Xugang Hua, Zhiwen Zhu, Shuyang Cao
Summary: Numerical simulations were used to investigate tornado-induced debris, which revealed little debris in the tornado core region and similar debris velocities to the wind field only when the tornado was in the multi-celled stage and the debris diameter was 2 cm. The debris velocity probability density function showed strong non-Gaussian characteristics for tornadoes with certain swirl ratios.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2021)
Article
Engineering, Aerospace
Yinkang Li, Shuang Li, Ming Xin
Summary: This paper addresses the modeling and high-precision attitude control of large-scale flexible parallel multibody spacecraft (FPMS). By establishing a dynamic model and proposing a corresponding control method, accurate attitude control and vibration suppression of flexible appendages can be achieved.
JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
(2022)
Article
Engineering, Chemical
Jitao Liu, Jiayang Pang, Xiaobing Liu, Yu Huang, Huiming Deng
Summary: Numerical simulations of sediment-water flow in the injector of a large Pelton turbine were conducted based on the solid-liquid two-phase flow model, SST k-omega model, and Lagrangian equation model. The distribution of pressure, velocity, erosion rate, and erosion location of the injector were obtained by analyzing the flow characteristics and sediment erosion distribution of the injector. The study revealed nonlinear velocity distribution and velocity deficit in the water inside the cylindrical jet, resulting in decreased jet quality of the injector. The sediment particle diameter influenced the erosion rate and erosion location of the needle and nozzle port ring. This study provided guidance for sediment erosion analysis and prediction in large Pelton turbines.
Article
Engineering, Environmental
Bin Li, Yang Gao, Yueping Yin, Jiawei Wan, Kai He, Weile Wu, Han Zhang
Summary: From August 31 to September 2, 2014, a 50-year heavy rainstorm caused a series of large-scale landslides in the Northeastern Chongqing area, China. The distribution of these landslides coincided with variations in rainfall intensity, with a threshold of 200 mm. The leading causes of these landslides are topographical, geological, geotechnical, and rainfall conditions. Future disaster prevention and mitigation should take these findings into consideration.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Environmental Sciences
Nuo-dong Li, Wei Liu, Jin-heng Zhao
Summary: On August 30, 2020, a high-intensity storm triggered a landslide-generated debris flow in the Heixiluo basin, causing fatalities and damage. Through a detailed field investigation and simulation analysis, the behavior and formation process of the debris flow were studied.
JOURNAL OF MOUNTAIN SCIENCE
(2022)
Article
Environmental Sciences
Kavita V. Mitkari, Manoj K. Arora, Reet Kamal Tiwari, Sanjeev Sofat, Hemendra S. Gusain, Surya Prakash Tiwari
Summary: This paper presents a method for large-scale glacier cover mapping using remote sensing imagery and OBIA, which can efficiently classify multiple glacier cover classes and accurately map important geomorphological features.
Article
Automation & Control Systems
Bo Fang, Dengqing Cao, Chao Chen, Shuai Chen
Summary: This paper develops a dynamic modeling approach for the mode characteristics analysis and forced vibration analysis of a cable dragged flexible spacecraft. The natural frequencies and global mode shapes of the spacecraft are determined using the Global mode method. Interesting mode localization and mode shift phenomena are observed, and the influence of joint nonlinearity on the overall system vibration is studied. The validity of the method is verified through comparison with finite element method results.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2022)
Review
Chemistry, Analytical
Elias A. G. Zagatto, Fabio R. P. Rocha
Summary: This article discusses the development of flow analysis from repetitive to real-time assays, emphasizing the importance of real-time decision-making, feedback mechanisms, and flow/manifold programming. Applications include segmented and unsegmented flow analysis of agronomical, clinical, environmental, industrial, pharmaceutical, and geological samples.
Article
Energy & Fuels
Biao Xie, Hanyang Zhang, Wenming Huo, Renfang Wang, Ying Zhu, Lizhen Wu, Guobin Zhang, Meng Ni, Kui Jiao
Summary: Gaining a deeper and clearer understanding of the transport mechanism in proton exchange membrane (PEM) fuel cells is crucial for their commercialization. This study investigates the water transition mechanism in the catalyst layer of PEM fuel cells from a macro-scale performance model perspective. Various operating conditions and water transition mechanisms are analyzed, and a self-adaptive mechanism is proposed and validated. The results show that the proposed method has good adaptability and fidelity for multi-condition simulation, which is an urgent requirement for PEM fuel cell research and development.
Article
Geochemistry & Geophysics
Zhenyu Wang, Gaowei Yue, Haixiao Lin, Minmin Li
Summary: The study of landslide dynamic characteristics and accumulation patterns is crucial in assessing landslide hazards. This study focuses on the Tangjiashan landslide and employs a combination of 3D modeling, terrain data, and image analysis to understand its movement. The results reveal that the Tangjiashan landslide is a traction-type landslide, with four distinct stages and notable characteristics of high speed and short range.
Article
Multidisciplinary Sciences
Sen Wang, Hanwu Zheng, Er Huang, Xingnian Liu, Ming Luo
Summary: Flash floods in mountainous regions have caused significant damage globally in recent years, affecting and destroying structures. The impact load of flash floods is a crucial factor in the destruction process. This study compared and analyzed five existing models for calculating impact pressure based on experimental data. Moreover, a new model considering both hydrodynamic and hydrostatic pressure was proposed by combining two existing models. The results showed improved accuracy in the new model, with reduced relative errors for empirical coefficients. Additionally, the distribution of fluid impact and the maximum pressure point against a passable obstacle were discussed. The findings of this research could contribute to ideas for designing structures that can withstand flood impact.
Article
Construction & Building Technology
Jun Gao, Faning Dang, Zongyuan Ma, Jie Ren
ADVANCES IN CIVIL ENGINEERING
(2019)
Article
Materials Science, Multidisciplinary
Shuangfeng Guo, Ning Li, Wenpeng Liu, Zongyuan Ma, Naifei Liu, Gao Lv
ADVANCES IN MATERIALS SCIENCE AND ENGINEERING
(2020)
Article
Engineering, Chemical
Zongyuan Ma, Wei Li, Zhaoyu Li, Xuefei Ruan, Kai Jiao
Summary: This paper analyzes the issues of temperature field, damaged areas, and structure cracking during the construction process of concrete pouring. An elastic and damaged constitutive model for concrete and a fully coupled analysis method for temperature-stress field were proposed. The study does not consider the influence of different concrete compositions and material properties. The results show that the temperature-stress complete coupling analysis method can be applied to analyze cracking in complex concrete structures during the pouring process. An efficient method is proposed to analyze the damage and cracking issues caused by temperature changes during the construction of concrete structures in metro stations, providing predictions and evaluations for reference in metro station construction and operation.
