Three-dimensional digitalization modeling characterization of pores in high-rank coal in the southern Qinshui basin

Shiqi Liu,Shuxun Sang,Jingsheng Ma,Xin Wang,Yi Du,Tian Wang 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.1

Pore connectivity is an important property of coal. To explore the connectivity of pore-fractures in terms of macropores and mesopores in high-rank coal, two coal samples collected from the coal seam #3 in the southern Qinshui basin were selected. A pore-fracture network model of high-rank coal on the nanometer (10–100 nm) to micrometer (0.1–10 μm) scale is constructed, and key parameters are extracted using the 3D (three-dimensional) digital spatial characterization based on 3D scanning with FIB-SEM (Focused Ion Beam Scanning Electron Microscopy). Then, the connectivity of the pore-fractures and the contribution of pores with different genetic types to the connectivity of the high-rank coal are confirmed. The results show that the pores and throats of high-rank coal in coal seam #3 in the southern Qinshui basin are very narrow, with predominant mesopores < 50 nm in width. The tortuosity of the coal samples is low, an the cross-section is predominantly square and triangular in shape, which means that the capillary resistance is small. The connectivity of the pores is poor, and mesopores play an important role in the pore connectivity. Linear differential shrinkage pores are the main connected pores on the nanometer scale and communicate with irregularly rounded and elliptic differential shrinkage pores, secondary pores, and mineral pores. The types and contents of the minerals in coals determine the morphological characteristics and degree of development of the differential shrinkage pores, and have an important influence on the pore connectivity in high-rank coal. The content of quartz determines the degree of development of the linear differential shrinkage pores, and is the primary reasons for the differences in the connectivity of the two samples.

Numerical Investigation of the Influence of Rock Characteristics on the Soil-Rock Mixture (SRM) Slopes Stability

Shiqi Liu,Huanling Wang,Weiya Xu,Zhichao Cheng,Zhipeng Xiang,Wei-Chau Xie 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.11

Soil-rock mixture is a widely distributed geological material in mountainous regions, where slope stability is an important issue. To investigate the influence of rock on slope stability, firstly, rocks in SRM are generated and then SRM slope models are simulated based on the finite difference method (FDM). The impact of various characteristics of rocks on slope factor of safety (FOS) is studied systematically by using the reduced strength method. The characteristic of rock considered include rock content, number of rock edges, aspect ratio, rock size and inclination of rock. The simulations indicate that increasing the rock content can prevent the development of high strain region and improve slope stability. However, the aspect ratio of rock has negligible impact on the mean value of FOS. For slopes with 45o slope angle, rocks with 45o angle of inclination result in smooth potential sliding surface, whereas rocks with 135o angle of inclination lead to more tortuous potential sliding surfaces. Statistical indices are utilized to analyze the results of numerical modelling.

A NOTE ON ω-NOETHERIAN RINGS

Shiqi Xing,Fanggui Wang 대한수학회 2015 대한수학회보 Vol.52 No.2

Let R be a commutative ring. An R-module M is called a ω-Noetherian module if every submodule of M is of ω-finite type. R is called a ω-Noetherian ring if R as an R-module is a ω-Noetherian module. In this paper, we present an exact version of the Eakin-Nagata Theorem on ω-Noetherian rings. To do this, we prove the Formanek Theorem for ω-Noetherian rings. Further, we point out by an example that the condition (†) in the Chung-Ha-Kim version of the Eakin-Nagata Theorem on SM domains is essential.

A NOTE ON w-NOETHERIAN RINGS

Xing, Shiqi,Wang, Fanggui Korean Mathematical Society 2015 대한수학회보 Vol.52 No.2

Let R be a commutative ring. An R-module M is called a w-Noetherian module if every submodule of M is of w-finite type. R is called a w-Noetherian ring if R as an R-module is a w-Noetherian module. In this paper, we present an exact version of the Eakin-Nagata Theorem on w-Noetherian rings. To do this, we prove the Formanek Theorem for w-Noetherian rings. Further, we point out by an example that the condition (${\dag}$) in the Chung-Ha-Kim version of the Eakin-Nagata Theorem on SM domains is essential.

Highly Sensitive Optical-fiber Humidity Sensor Based on Nafion-PVA Sol-gel

Ning Wang,Yuhao Li,Xiaolei Yin,Wenting Liu,Shiqi Liu,Liang Xu,Xuwei Zhao,Yanxi Zhong 한국광학회 2023 Current Optics and Photonics Vol.7 No.1

Simulations of the hysteretic behavior of thin-wall cold-formed steel members under cyclic uniaxial loading

Dong, Jun,Wang, Shiqi,Lu, Xi Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.24 No.3

In this paper, the hysteretic behaviors of channel and C-section cold-formed steel members (CFSMs) under cyclic axial loading were simulated with the finite element method. Geometric and material nonlinearities, Bauschinger effect, strain hardening and strength improvement at corner zones were taken into account. Extensive numerical results indicated that, as the width-to-thickness ratio increases, local buckling occurs prematurely. As a result, the hysteretic behavior of the CFSMs degrades and their energy dissipation capability decreases. Due to the presence of lips, the hysteretic behavior of a C-section steel member is superior to that of its corresponding channel section. The intermediate stiffeners in a C-section steel member postpone the occurrence of local buckling and change its shapes, which can greatly improve its hysteretic behavior and energy dissipation capability. Therefore, the CFSMs with a large width-to-thickness ratio can be improved by adding lips and intermediate stiffeners, and can be used more extensively in residential buildings located in seismic areas.

UDGAN: A new urban design inspiration approach driven by using generative adversarial networks

干薇,Zhao Zichen,Wang Yuankai,Zou Yixuan,Zhou Shiqi,오지강 한국CDE학회 2024 Journal of computational design and engineering Vol.11 No.1

The morphological design of urban space affects the quality of the environment. The traditional experience-based design approach was greatly improved by introducing computational design tools. However, the existing urban design tools are mostly developed on pre-set rules or given targets, which have few contributions to enhance creativity or generate inspiring schemes. Therefore, this paper proposes a new computational urban design approach named UDGAN, integrating generative adversarial networks (GANs) and multi-objective optimization algorithms. This model utilizes urban design scheme plans over the past 20 years from a particular designer as training datasets. Four preference models were trained to autonomously generate stylized urban design schemes. Eight morphological parameters were used to analyze the model performance by comparing generated results with the ground truth. This GAN-based surrogate approach is combined with a morphological indicator alignment process using multi-objective optimization model to obtain better results. The result shows that the R2 predicted by the improved Pix2Pix model reaches 0.798, and the similarity of the generated results can be stably distributed between 0.7 and 0.8, so the design scheme of this preferred style can be effectively learned. At the same time, the pre-trained model greatly reduces the time consumption of the design scheme generation, taking 5 min approximately to complete a generation process. This approach quickly generated the design scheme with preferred features, supporting the designer with creativity and greatly saving the time of design creation, transforming computational design into an inspiration-driven process.

A Novel Identification Approach for Palm Bio-impedance Spectroscopy

Lintao Lv,Sheng Wang,Shiqi Huang,Xinhong Hei,Yuxiang Yang 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.5

Aiming at the properties of the palm bio-impedance spectroscopy (PBIS) data and shortage of the existing algorithms, this paper proposed a kind of the PBIS identification method based on immune clone. This method mainly consisted of three parts, which are data normalization, feature selection and matching. The PBIS algorithm constructed a new classifier based on the immune clone selection algorithm (ICSA) and the hidden space support vector machine (HSSVM), called the ICSA-HSSVM. It was compared with other classifiers such as Euclidean distance, cosine distance and support vector machine (SVM). The experimental results show that the proposed classification method can achieve more than 95% accuracy in identity recognition. The PBIS biometric identification tech depends on the human body inherent characteristics to carry out the status identification so as to overcome the drawbacks of traditional information safety tech status identification. The main advantages of PBIS algorithm include four aspects. The first is the uniqueness, universality, stability, easy collection, and it is basically not being subject to the influence of pathological changes in the human body positions. The second is not sensitive to the environment and the excellent recognition performance can be obtained through the method easily. The three is high stability and uniqueness when it is served as the biometric potentiality, being in agreement with biometric identification requirements. (4) The four is able to resist against counterfeiting attacks effectively. The method proposed in this paper is of great theoretical and practical values in the fields of national public security, internet information security, military communication security, micro-blog micro-message public opinion supervision.

MicroRNA-576-3p Inhibits Proliferation in Bladder Cancer Cells by Targeting Cyclin D1

Liping Xie,Zhen Liang,Shiqi Li,Xin Xu,Xianglai Xu,Xiao Wang,Jian Wu,Yi Zhu,Zhenghui Hu,Yiwei Lin,Yeqing Mao,Hong Chen,Jindan Luo,Ben Liu,Xiangyi Zheng 한국분자세포생물학회 2015 Molecules and cells Vol.38 No.2

MicroRNAs (miRNAs) are small, endogenous RNAs that play important gene-regulatory roles by binding to the imperfectly complementary sequences at the 3 -UTR of mRNAs and directing their gene expression. Here, we first discovered that miR-576-3p was down-regulated in human bladder cancer cell lines compared with the non-malignant cell line. To better characterize the role of miR-576-3p in bladder cancer cells, we over-expressed or down-regulated miR-576-3p in bladder cancer cells by transfecting with chemically synthesized mimic or inhibitor. The overexpression of miR-576-3p remarkably inhibited cell proliferation via G1-phase arrest, and decreased both mRNA and protein levels of cyclin D1 which played a key role in G1/S phase transition. The knock-down of miR-576-3p significantly promoted the proliferation of bladder cancer cells by accelerating the progression of cell cycle and increased the expression of cyclin D1. Moreover, the dual-luciferase reporter assays indicated that miR-576-3p could directly target cyclin D1 through binding its 3 -UTR. All the results demonstrated that miR-576-3p might be a novel suppressor of bladder cancer cell proliferation through targeting cyclin D1.

Whole Genome Sequence of Lactiplantibacillus plantarum HOM3204 and Its Antioxidant Effect on D-Galactose-Induced Aging in Mice

Zhang Di,Shin Heesung,Wang Tingting,Zhao Yaxin,Lee Suwon,Lim Chongyoon,Zhang Shiqi 한국미생물·생명공학회 2023 Journal of microbiology and biotechnology Vol.33 No.8

Lactiplantibacillus plantarum, previously named Lactobacillus plantarum, is a facultative, homofermentative lactic acid bacterium widely distributed in nature. Several Lpb. plantarum strains have been demonstrated to possess good probiotic properties, and Lpb. plantarum HOM3204 is a potential probiotic strain isolated from homemade pickled cabbage plants. In this study, wholegenome sequencing was performed to acquire genetic information and predict the function of HOM3204, which has a circular chromosome of 3,232,697 bp and two plasmids of 48,573 and 17,060 bp, respectively. Moreover, various oxidative stress-related genes were identified in the strain, and its antioxidant activity was evaluated in vitro and in vivo. Compared to reference strains, the intracellular cell-free extracts of Lpb. plantarum HOM3204 at a dose of 1010 colony-forming units (CFU)/ml in vitro exhibited stronger antioxidant properties, such as total antioxidant activity, 2,2- diphenyl-1-picrylhydrazyl radical scavenging rate, superoxide dismutase activity, and glutathione (GSH) content. Daily administration of 109 CFU Lpb. plantarum HOM3204 for 45 days significantly improved the antioxidant function by increasing the glutathione peroxidase activity in the whole blood and GSH concentration in the livers of D-galactose-induced aging mice. These results suggest that Lpb. plantarum HOM3204 can potentially be used as a food ingredient with good antioxidant properties.