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Xiaopeng Jia,Haibing Wang,Hongfang Wang 한국지질과학협의회 2014 Geosciences Journal Vol.18 No.2
Siltation of coarse sediment in the river channel isthe main cause of flooding and dike burst on China’s Yellow River,and the loess are thought as the coarse sediment sources of the lowerreach of the Yellow River. The Ningxia-Inner Mongolia reaches ofthe Yellow River flow through an extensive area of aeolian desert,with flood events occurring frequently in this region. In this paper,we investigate the trace element contents of the coarse sediment inthe Ningxia-Inner Mongolia reaches of the Yellow River. The mainchemical components of the coarse sediments consist of 28 traceelements. Correlation analysis and factor analysis of 21 of thesetrace elements indicates that Ti and Zr are stable indicators of thecoarse sediment sources. Comparing the spatial distribution of someof the main trace elements to major sources and riverbed sedimentof the main reaches of the Yellow River suggests that the coarsesediments deposited in the Ningxia-Inner Mongolia reaches aremostly controlled by the local sediment sources. The results of R-factoranalysis further proved that desert sand, riverbank material,and the Ten Tributaries are the primary sources of the coarse sedimentin the Ningxia-Inner Mongolia reaches of the Yellow River.
Xiaopeng Wang,Jia-gang Wu,Ting Zheng,Xiaojing Cheng,Binyu Zhang,Dingquan Xiao,Jian-guo Zhu 한국물리학회 2014 Current Applied Physics Vol.14 No.5
In this work, 0.96(K0.48Na0.52)1xLixNbO3e0.04Bi0.5Na0.5ZrO3 lead-free piezoceramics were prepared using the conventional solid state reaction method in order to attain both a high TC and an enhanced d33. The effect of Li content on their phase structure, electrical properties, and stability was systematically investigated. These results indicate that adding Li could result in the increase of TC and the decrease of TOeT. Here we obtain the ceramics with an orthogonaletetragonal phase boundary in the composition of x ¼ 0.02, and then enhanced piezoelectric properties and a high Curie temperature (i.e., d33 w 255 pC/N, kp w 41%, and TC w 360 C) were observed, showing the realization of our objective. In addition, a good stability of piezoelectric and ferroelectric properties has been shown in such a material system.
A Parametric Study of the Functioning of an Axisymmetric Explosive Separation Device
Guangyu Wang,Quan Wen,Xiaopeng Wang,Yushi Wang 한국항공우주학회 2021 International Journal of Aeronautical and Space Sc Vol.22 No.6
At present, the design and optimization of the linear explosive separation device mainly depends on experiment, which is not only costly but also low efficient. The introduction of finite element analysis prior to experiment may reduce the cost to design a linear explosive separation device. Herein, arbitrary Lagrangian–Eulerian (ALE) numerical method is utilized to investigate the functioning of an axisymmetric explosive separation device. Firstly, several ALE models are validated via explosive separation experiments and photonic Doppler velocimetry (PDV) measurements, and found to have reasonable accuracy. Then, a series of ALE models are developed to study the transient separation process of an axisymmetric explosive separation device. Multiple factors which may influence the process are identified through parametric study. Especially, it is found that the linear density of the explosive core in the detonating cord and the bottom radius of the v-notch on the separation plate are critical for the accumulation of effective plastic strain at the v-notch. In addition, the material of the protection plate and the angle of the v-notch have a certain influence on the effective plastic strain at the v-notch. The material strength of the protection plate almost has little influence on the effective plastic strain at the v-notch. The study may facilitate the optimal design of the axisymmetric explosive separation device.
Chengbin Wang,Hao Chen,Xiaopeng Wang,Zhongping Wu,Weiwei Liu,Yuanmei Guo,Jun Ren,Nengshui Ding 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.12
Objective: Copy number variations (CNVs) are a major source of genetic diversity complementary to single nucleotide polymorphism (SNP) in animals. The aim of the study was to perform a comprehensive genomic analysis of CNVs based on high density whole-genome SNP markers in Chinese Dongxiang spotted pigs. Methods: We used customized Affymetrix Axiom Pig1.4M array plates containing 1.4 million SNPs and the PennCNV algorithm to identify porcine CNVs on autosomes in Chinese Dongxiang spotted pigs. Then, the next generation sequence data was used to confirm the detected CNVs. Next, functional analysis was performed for gene contents in copy number variation regions (CNVRs). In addition, we compared the identified CNVRs with those reported ones and quantitative trait loci (QTL) in the pig QTL database. Results: We identified 871 putative CNVs belonging to 2,221 CNVRs on 17 autosomes. We further discarded CNVRs that were detected only in one individual, leaving us 166 CNVRs in total. The 166 CNVRs ranged from 2.89 kb to 617.53 kb with a mean value of 93.65 kb and a genome coverage of 15.55 Mb, corresponding to 0.58% of the pig genome. A total of 119 (71.69%) of the identified CNVRs were confirmed by next generation sequence data. Moreover, functional annotation showed that these CNVRs are involved in a variety of molecular functions. More than half (56.63%) of the CNVRs (n = 94) have been reported in previous studies, while 72 CNVRs are reported for the first time. In addition, 162 (97.59%) CNVRs were found to overlap with 2,765 previously reported QTLs affecting 378 phenotypic traits. Conclusion: The findings improve the catalog of pig CNVs and provide insights and novel molecular markers for further genetic analyses of Chinese indigenous pigs.
Ultimate Behavior and Design of Cold-Formed Steel Square Hollow Section Members
Xiaopeng Shi,Xin Cheng,Xiaxin Wang,Mohamad Mansour 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.3
The ultimate behavior and design of cold-formed steel square hollow section (SHS) members are investigated in the present study, with the focus on their local buckling behavior under pure compression and pure bending, as well as combinations of compression and bending. Finite element (FE) models are established and validated against existing experimental data collected from the literatures; the FE models take into account the initial local imperfections, geometric and material nonlinearities, and cold-formed eff ect. Following the validation, the FE models are utilized to perform a series of parametric studies, considering diff erent cross-section width-to-thickness ratios and loading cases. The stress distributions within the critical cross-section of the SHS members under diff erent loading conditions are investigated and an eff ective plastic width method (EPM) is proposed for the determination of the ultimate resistance of SHS in compression and bending. The numerically obtained results are used to assess the accuracy of the existing design rules stipulated in the Chinese and European design codes and the proposed EPM. It is shown that the proposed EPM is able to provide more accurate design predictions in relative to the codifi ed design approaches, owing largely to its rational considerations of the strain hardening, cold-formed eff ect and partial plasticity of the cold-formed SHS members.
A Smart Home Context-aware Model Based on UML and Colored Petri Net
Xiaopeng Niu,Zhiliang Wang 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.1
Smart Home is one of the main application domains of Pervasive Computing, and it can provide Context-aware Services to homeowners. As context information is obtained from different sources in the Smart Home environment, the context information may be heterogeneous, inaccurate and dynamic. How to effectively model these different types of context information is a main research issue. To address this issue, we propose a hybrid Context-aware Modeling approach based on UML and Colored Petri Net in this paper. We also model leave home scenario using this approach, and use Coverability Graph to verify the leave home scenario model.
Xiaopeng Zhang,Boxiong Shen,Kai Wang,Jianhong Chen 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
‘Three catalysts Mn/Ce–ZrOX, Mn–Co/Ce–ZrOX and Mn/Co–Ce–ZrOX were used for low-temperature NH3-SCR of NO. XRD, TPR and XPS were performed to characterize the physicochemical property of the catalysts. Experimental results showed that Mn/Co–Ce–ZrOX had a higher dispersion of manganese oxides, a better redox property, more surface acid sites and more surface adsorbed oxygen species and Mn4+ ion. These facts caused a better low-temperature activity for Mn/Co–Ce–ZrOX which was 99.0% at 180 8C. Furthermore, Mn/Co–Ce–ZrOX showed the best resistance to SO2 and H2O which mainly because the introduction of cobalt inhibited the formation of sulfate salts and hydroxyls on the surface of Mn/Co–Ce–ZrOX.