Numerical investigations on stability evaluation of a jointed rock slope during excavation using an optimized DDARF method

Li, Yong,Zhou, Hao,Dong, Zhenxing,Zhu, Weishen,Li, Shucai,Wang, Shugang Techno-Press 2018 Geomechanics & engineering Vol.14 No.3

A jointed rock slope stability evaluation was simulated by a discontinuous deformation analysis numerical method to investigate the process and safety factors for different crack distributions and different overloading situations. An optimized method using Discontinuous Deformation Analysis for Rock Failure (DDARF) is presented to perform numerical investigations on the jointed rock slope stability evaluation of the Dagangshan hydropower station. During the pre-processing of establishing the numerical model, an integrated software system including AutoCAD, Screen Capture, and Excel is adopted to facilitate the implementation of the numerical model with random joint network. These optimizations during the pre-processing stage of DDARF can remarkably improve the simulation efficiency, making it possible for complex model calculation. In the numerical investigations on the jointed rock slope stability evaluations using the optimized DDARF, three calculation schemes have been taken into account in the numerical model: (I) no joint; (II) two sets of regular parallel joints; and (III) multiple sets of random joints. This model is capable of replicating the entire processes including crack initiation, propagation, formation of shear zones, and local failures, and thus is able to provide constructive suggestions to supporting schemes for the slope. Meanwhile, the overloading numerical simulations under the same three schemes have also been performed. Overloading safety factors of the three schemes are 5.68, 2.42 and 1.39, respectively, which are obtained by analyzing the displacement evolutions of key monitoring points during overloading.

Comparative transcriptome analysis reveals differential transcription in heat-susceptible and heat-tolerant pepper (Capsicum annum L.) cultivars under heat stress

Tao Li,Xiaowan Xu,Ying Li,Hengming Wang,Zhiliang Li,Zhenxing Li 한국식물학회 2015 Journal of Plant Biology Vol.58 No.6

Heat stress is an important agricultural problem around the world. In pepper (Capsicum annum L.), heat stress seriously affects pollination and yield. However, to date, the molecular basis of heat stress has not been extensively studied. Using the HiSeq™ 2000 sequencing platform, the seedling transcriptome of heat-susceptible C.annuum ‘S590’(CaS) and heat-tolerant ‘R597’ (CaR) under the heat stress was examined. Over five million clean reads were generated from each library, each corresponding to a coverage of >250,000 nt. About 73% of the reads were mapped to the pepper genome, and 3,799 and 4,010 differentially expressed genes (DEGs) were identified in ‘R597’ (CaR) and ‘S590’(CaS), respectively. Gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses determined that the identified DEGs were involved in heat shock protein, heat shock transcription factors, hormone, as well as calcium and kinase signaling. Further validation identified 35 genes that were involved in stress response, and that most of the heat shock proteins were upregulated in two genotypes, and highly expressed in susceptible S590 than in tolerant cultivar R597; the transcription factors and hormone signaling genes showed higher levels of expression in the heat-tolerant cultivar R597 than that observed in the heat-susceptible S590. These findings facilitate in better understanding of the molecular mechanism underlying heat stress in different pepper genotypes.

A hybrid decoding of Reed–Muller codes

Li, Shuang,Zhang, Shicheng,Chen, Zhenxing,Kang, Seog Geun Taylor & Francis 2017 INTERNATIONAL JOURNAL OF DISTRIBUTED SENSOR NETWOR Vol.13 No.2

The Nonlinear Effect of Industrial Structural Upgrading on Carbon Emission Intensity: An Empirical Analysis of 30 Provinces in China

Li Haiyan,LUO ZHENXING 한국아시아학회 2023 아시아연구 Vol.26 No.4

Given the urgent and disturbing state of global warming, a meticulous investigation into the determinants influencing carbon emission intensity becomes imperative. This paper comprehensively analyzes carbon emission intensity data and its influencing factors from 1997 to 2019 across 30 provinces in China. By constructing a panel dataset and employing the panel threshold model as a methodological tool, our study explores the nonlinear relationship between industrial upgrading and carbon emission intensity within the regional scope of Chinese provinces. Furthermore, in this specific context, our study examines various economic development determinants' impact on carbon emission intensity. Empirical research results indicate that the relationship between China's industrial structure upgrading and carbon emission intensity is rather complex. As the industrial structure continuously upgrades, a U-shaped curve relationship is observed between the two variables. Energy intensity and technological progress exhibit positive impacts of 0.56% and 0.04%, respectively, on carbon emission intensity. In contrast, the inhibitory effect of per capita GDP on carbon emission intensity is 0.17%. Therefore, to achieve low-carbon and sustainable development, the Chinese government must strategically prioritize cultivating high-value-added service sectors in the tertiary industry. Simultaneously, while promoting and developing low-carbon technologies, coordination is necessary to enhance energy-intensive sectors' synchronous enhancement. Additionally, the scope of efforts must also include the systematic decarbonization of the second industry by enhancing energy efficiency and increasing the proportion of clean energy utilization.

New 3D 16-Ary Signal Constellations and Their Symbol Error Probabilities in AWGN and Rayleigh Fading Channels

Chen, Zhenxing,Liu, Jiaheng,Li, Shuang,Kang, Seog Geun Hindawi Limited 2018 WIRELESS COMMUNICATIONS AND MOBILE COMPUTING Vol.2018 No.-

<P>Two three-dimensional (3D) 16-ary signal constellations having extended lattice structures are presented in this paper. The theoretical symbol error probabilities (SEPs) of the new constellations in additive white Gaussian noise (AWGN) and Rayleigh fading channel are derived. Computer simulation confirms that the closed-form expressions for average SEPs of the constellations in the AWGN channel are very accurate. The theoretical SEP upper bounds in the Rayleigh fading channel are very tight. Since the presented constellations have larger minimum Euclidean distance (MED) than the conventional one, error performance can be improved up to 0.9 dB in an AWGN environment. Hence, the proposed constellations and their theoretical analysis can be used as a reference for the development of a wireless communication system with 3D signal constellations.</P>

A GPC-based Multi-variable PID Control Algorithm and Its Application in Anti-swing Control and Accurate Positioning Control for Bridge Cranes

Bin Yang,Zhenxing Liu,Hui-Kang Liu,Yan Li,Sen Lin 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.10

It is one of the key tasks for the bridge crane to achieve anti-swing control of the hook and the accurate positioning of the body to work efficiently, safely and automatically. Based on the Lagrange equation, this paper is to propose a dynamic model of the crane motion system for designing controller. In the controller design, ProportionalIntegral-Derivative (PID), the most widely used controller in engineering, is adopted and a new parameter tuning algorithm for a multi-variable PID controller based on generalized predictive control (GPC) is given. It is foundthat the multi-variable PID controller shares the same structural mathematical expressions with the GPC law, which makes for the transfer and calculation of the three parameters P, I and D, and that the new algorithm enables the traditional PID controller to perform as brilliantly as the GPC. The results of both the simulation and real-time control experiments show that the newly-proposed PID controller can effectively eliminate the swing of the hook and control the bridge cranes moving position accurately.

Optimization of urban ecological security and spatial pattern based on remote sensing monitoring- A case study of Shenyang

Jiang Mingzhuo,Li Sui,Li zhenxing,Shi Tiemao 국제온돌학회 2016 International Journal of Ondol Vol.9 No.2

The study concentrates on the status of ecological environment development in Shenyang, uses the remote sensing images and social statistics in different periods as the data base, establishes a dynamic monitoring system and model of urbanization and ecological security. Through the identification and quantitative analysis of ecological security dynamic monitoring information, with the support of spatial information technology, we have formed a key technology system which combines ecological security warning with ecological security structure optimization. Moreover, the spatial database of ecological key elements in Shenyang city was constructed. The vertical pattern, horizontal pattern and ecological function of urban ecological system is organically combined, which provides the basic data for the layout and regulation of green space and water system. With these efforts, a key technology system is formed, including the warning of urban ecological security- the space regulation of economic development- the optimization of urban ecological security pattern - the regulation of urban elements’ spatial layout. The research results provide scientific and accurate data base for ecological planning and regulation in Shenyang City, carry out effective ecological security monitoring and management for the development of Shenyang, protect the ecological integrity of the system as well as the healthy development of the economy in Shenyang City during the urbanization process.

An Improved Phase-Shifted Carrier Pulse Width Modulation Based on the Artificial Bee Colony Algorithm for Cascaded H-Bridge Multilevel Inverters

Xinjian Cai,Zhenxing Wu,Quanfeng Li,Shuxiu Wang 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2

Cascaded H-bridge multilevel (CHBML) inverters usually include a large number of isolated dc-voltage sources. Some faults in the dc-voltage sources result in unequal cell dc voltages. Unfortunately, the conventional phase-shifted carrier (PSC) PWM method that is widely used for CHBML inverters cannot eliminate low frequency sideband harmonics when the cell dc voltages are not equal. This paper analyzes the principle of sideband harmonic elimination, and proposes an improved PSCPWM that can eliminate low frequency sideband harmonics under the condition of unequal dc voltages. In order to calculate the carrier phases, it is necessary to solve transcendental equations for low frequency sideband harmonic elimination. Therefore, an approach based on the artificial bee colony (ABC) algorithm is presented in this paper. The proposed PSCPWM method enhances the reliability of CHBML inverters. The proposed PSCPWM is not limited to CHBML inverters. It can also be applied to other types of multilevel inverters. Simulation and experimental result obtained from a prototype CHBML inverter verify the theoretical analysis and the achievements made in this paper.

Preconditioned Gauss-Seidel iterative method for Z-matrices linear systems

Hailong Shen,Xinhui Shao,Zhenxing Huang,Chunji Li 대한수학회 2011 대한수학회보 Vol.48 No.2

For Ax=b, it has recently been reported that the convergence of the preconditioned Gauss-Seidel iterative method which uses a matrix of the type P=I+S(α) to perform certain elementary row operations on is faster than the basic Gauss-Seidel method. In this paper, we discuss the adaptive Gauss-Seidel iterative method which uses P=I+S(α) +[기호](β) as a preconditioner. We present some comparison theorems, which show the rate of convergence of the new method is faster than the basic method and the method in [7] theoretically. Numerical examples show the effectiveness of our algorithm.

An Improved Phase-Shifted Carrier Pulse Width Modulation Based on the Artificial Bee Colony Algorithm for Cascaded H-Bridge Multilevel Inverters

Cai, Xinjian,Wu, Zhenxing,Li, Quanfeng,Wang, Shuxiu The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2

Cascaded H-bridge multilevel (CHBML) inverters usually include a large number of isolated dc-voltage sources. Some faults in the dc-voltage sources result in unequal cell dc voltages. Unfortunately, the conventional phase-shifted carrier (PSC) PWM method that is widely used for CHBML inverters cannot eliminate low frequency sideband harmonics when the cell dc voltages are not equal. This paper analyzes the principle of sideband harmonic elimination, and proposes an improved PSCPWM that can eliminate low frequency sideband harmonics under the condition of unequal dc voltages. In order to calculate the carrier phases, it is necessary to solve transcendental equations for low frequency sideband harmonic elimination. Therefore, an approach based on the artificial bee colony (ABC) algorithm is presented in this paper. The proposed PSCPWM method enhances the reliability of CHBML inverters. The proposed PSCPWM is not limited to CHBML inverters. It can also be applied to other types of multilevel inverters. Simulation and experimental result obtained from a prototype CHBML inverter verify the theoretical analysis and the achievements made in this paper.