Simultaneously photocatalytic removal of Cr(VI) and metronidazole by asynchronous cross-linked modified sodium alginate

Shaojie Wu,Mingyang Li,Lili Xin,Hongming Long,Xiangpeng Gao 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-

Conventional photocatalysts for environmental applications are mainly transitional metal compounds orprecious metal nanoparticles, which suffer from weak pollutant adsorption performance, thus limitedtheir applications for high concentrated wastewaters. In this study, asynchronous cross-linked triethylenetetraminemodified sodium alginate (CFTS) was used as photocatalyst for the simultaneouslycatalytic degradation of Cr(VI) and metronidazole (MNZ). Experimental results suggested that asynchronouscross-linking and triethylenetetramine modification have dramatically enhanced the chemicalstability as well as the adsorption and photocatalytic behavior of the material. The grafted amino functionalgroups and cross-linked Fe3+ ions can promote the rapid separation and transfer of electrons, thusreducing the recombination rate of photo-generated electron-hole pairs. The optimum removal rate of Cr(VI) has reached 99.5 % and MNZ can be completely removed within 20 and 30 min at pH 1.0 under UVlight irradiation, respectively. The removal mechanism of Cr(VI) by CFTS is the synergistic effect of electrostaticadsorption and photocatalytic reduction, while photocatalytic oxidation dominated the degradationprocess of MNZ. Moreover, the removal efficiency can be enhanced in the binary solution ofthese two pollutants due to the utilization of photo generated electron-hole pairs, which provides newpathways in the treatment of complicated pharmaceutical and domestic sewage wastewaters.

Effects of the Production-Oriented Approach on the Syntactic Complexity of English Writing by Chinese University Students: Evidence from a Pedagogical Intervention Study

Shaojie Li,장세은 대한언어학회 2021 언어학 Vol.29 No.4

The Production-oriented Approach (POA) has been developed over the past decade to improve university English instruction in China, and has proven effective. Empirical studies investigating its long-term effects on the quality of university students’ English writing are still under-represented, however. To fill the research gap, we conducted a 16-week experiment, exploring its effects on the syntactic complexity of six Chinese university students’ English writing. The results are as follows: (1) Generally, the POA exerted a positive impact on the syntactic complexity of the students’ writings. (2) In terms of proficiency level, for the higher-level learners, although there were no significant differences among the pretest, posttest, and delayed posttest, there was an improvement from the pretest to delayed posttest in the mean length of T-unit (MLT) and from the pretest to posttest in the complex nominal per T-unit (CN/T), demonstrating the effectiveness of the POA. For the intermediate level learners, there were no significant differences in both the MLT and CN/T, whereas the continuous improvement from the pretest to delayed posttest revealed the POA’s lasting impact on the syntactic complexity. For the lower-level learners, the values of the CN/T showed a significant difference between the pretest and delayed posttest, indicating that the POA had a significant effect on the syntactic complexity of their written language. It is hoped that this study can shed light on an effective approach to teaching English as a foreign language at the tertiary level.

Effects of Production-Oriented Approach on Syntactic Complexity of English Writings by Chinese University Students: Evidence from a Pedagogical Intervention Study

Shaojie Li 새한영어영문학회 2021 새한영어영문학회 학술발표회 논문집 Vol.2021 No.10

This comparative study aims to explore frequent four-word lexical bundle found in each rhetorical Moves of research article (RA) abstract and the relationship between functional distribution of lexical bundles and RA Moves. The two corpora used in this study were Native Research Article Abstract Corpus and Chinese Research Article Abstract Corpus, which were self-built out of research article abstracts from international and Chinese journals of Applied linguistics. The two corpora were manually tagged with rhetorical move information. Results indicated that differences and similarities of lexical bundle preference were found in the two corpora. For frequent bundles in the five Moves, we found more research-oriented and stance-oriented bundles for Move 1, research-oriented bundles for both Move 2 and Move 3, text-oriented bundles for Move 4, and stance-oriented and text-oriented bundles for Move 5. Comparison of functional distribution of L1 and L2 group showed that L2 writers demonstrated a tendency to overuse research-oriented and text-oriented bundles in Move 3 and Move 4, and underuse them in Move 5. L2 writers used heavily certain bundles in their RA abstract moves, which may indicate a lack of variety in the move rhetorical realization. Findings from this study may provide a positive reference for academic writing instruction in English for Academic Purpose.

Rapid and Automatic Image Acquisition System for Structural Surface Defects of High-Speed Rail Tunnels

Shaojie Qin,Taiyue Qi,Bo Lei,Zongyang Li 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.2

Continuous high-speed (>80 km/h) tunnel-image detection introduces new challenges to defect image acquisition, including machine recognition of entry and exit from a tunnel, storage of massive image data streams, image distortion due to surface photography, and encoder errors. In this study, an automatic image acquisition system is designed, and several critical technologies are proposed for high-speed rail tunnels. The system realizes quick tunnel identification and automatic camera control and uses the proposed line-scan software-matching method to obtain accurate images. Before storage, the real-time modification of the distorted images is implemented using an error-correction algorithm. An alternative mapping storage algorithm is proposed to improve the efficiency and stability of long-term storage. The test results show that the proposed method effectively reduces photographic errors. The lateral pixel-error rate of the corrected image is 1.60%, which is 10 times lower than that of the pre-correction, and the error rate of the longitudinal image is controlled within 10% when the system is moving at a variable speed and within 1% when it is moving at a constant speed. Furthermore, experiments have proven that the alternate mapping storage algorithm improves the storage efficiency of RAID by 50% and ensures data integrity; storage is accomplished by 8 HDDs at a camera throughput of 1.52 GB/s. This study will contribute to improvements in the speed and accuracy of tunnel defect-image detection.

Intermittent Failure Detection of Multiple Electrical Connectors in EWIS

Shaojie Zhang,Zhen Cai 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.2

Electrical wiring interconnection system (EWIS) of civil aircraft has been paid more attention in recentyears, and intermittent failure detection of electrical connectors in EWIS is a challenging problem. This paperpresents a sliding mode observer (SMO) approach for the intermittent failure detection of an aircraft electricalsystem with multiple connector failures. The mathematical model of the aircraft electrical system which containsmultiple connector failures is established for transforming the intermittent failure detection problem into observerbasedmultiplicative faults isolation and estimation problems. A set of adaptive sliding mode observers are designedto locate the failure connectors preliminarily, the observers can adapt the unknown upper bound of the faults. Furthermore, a fault-reconstruction scheme applying the equivalent output error injection principle is proposed forfault estimation, where the characteristic parameters of connecters are reconstructed to identify the failures. Finally,a numerical example is provided to show the effectiveness of the proposed method.

Control Surface Faults Neural Adaptive Compensation Control for Tailless Flying Wing Aircraft with Uncertainties

Shaojie Zhang,Weifang Shuang,Qingkai Meng 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.4

A neural adaptive compensation tracking control scheme considering the prescribed tracking performance bound is proposed for a flying wing aircraft with control surface faults, actuator saturation and uncertainties of aerodynamic parameters. Second-order command filters are introduced to avoid the saturation of the actuators, prescribed performance bound strategy is designed to characterize the convergence rate and maximum overshoot of the tracking error, uncertainties of aerodynamic parameters are approximated by online RBF neural networks, and control allocation law is designed to reduce the coupling of the flight dynamics. The closed-loop control law is given based on adaptive backstepping compensation control scheme, and the stability of the closed-loop system is proved by Lyapunov based design. Simulation results are given to illustrate the effectiveness of the proposed neural adaptive compensation control scheme.

Dynamic Generation Method of Virtual Coal Mining Scene Based on 3D Entities Transformation and Combination

Shaojie Hou,Xianzun Meng,Yuwei Zhang 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.11

In order to present the virtual scene of underground coal mining, a dynamic and data-driven method for the virtual scene generation was proposed and its experimental software was developed. The data model of the software system is classified as two types that are the primary model and the display model. The system structure is designed as four layers from bottom to top, namely storage layer, display layer, combination layer and operation layer. Storage layer, the lowest layer and the data center of the system to store all the primary models, is a database containing some data tables, views, constrains, rules and storage processes. Display layer as the second lower layer is to implement an essential data-driven algorithm to transform the selected primary models into display models through scaling, stretching, rotating or assembly operations. Combination layer focuses on the whole scene building business based on the operation of related display models such as visible setting, connecting, handling the shading and presenting special effects. Operation layer as the top layer is to respond to user’s instructions such as free roaming and screen pickup. Finally, the software is tested in Qinan colliery of China. Results show that the proposed method is practicable and efficient to implement virtual coal mining scene.

Investigation lateral deformation and failure characteristics of strip coal pillar in deep mining

Chen, Shaojie,Qu, Xiao,Yin, Dawei,Liu, Xingquan,Ma, Hongfa,Wang, Huaiyuan Techno-Press 2018 Geomechanics & engineering Vol.14 No.5

In deep mining, the lateral deformation of strip coal pillar appears to be a new characteristic. In order to study the lateral deformation of coal-mass, a monitoring method and monitoring instrument were designed to investigate the lateral deformation of strip coal pillar in Tangkou Coalmine with the mining depth of over 1000 m. Because of without influence of repeated mining, the bedding sandstone roof is easy to break and the angle between maximum horizontal stress and the roadway is small, the maximum lateral deformation is only about 287 mm lower than the other pillars in the same coalmine. In deep mining, the energy accumulation and release cause a discontinuous damage in the heterogeneous coal-mass, and the lateral deformation of coal pillar shows discontinuity, step and mutation characters. These coal-masses not only show a higher plasticity but also the high brittleness at the same time, and its burst tendency is more obvious. According to the monitoring results and theoretical calculations, the yield zone of the coal pillar width is determined as 15.6 m. The monitoring results presented through this study are of great significance to the stability analysis and design of coal pillar.

Phase Transitions of Formamidinium Lead Iodide Perovskite under Pressure

Jiang, Shaojie,Luan, Yiliang,Jang, Joon I.,Baikie, Tom,Huang, Xin,Li, Ruipeng,Saouma, Felix O.,Wang, Zhongwu,White, Timothy J.,Fang, Jiye American Chemical Society 2018 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.140 No.42

<P>The pressure-induced structural evolution of formamidinium-based perovskite FAPbI<SUB>3</SUB> was investigated using <I>in situ</I> synchrotron X-ray diffraction and laser-excited photoluminescence methods. Cubic α-FAPbI<SUB>3</SUB> (<I>Pm</I>3̅<I>m</I>) partially and irreversibly transformed to hexagonal δ-FAPbI<SUB>3</SUB> (<I>P</I>6<SUB>3</SUB><I>mc</I>) at a pressure less than 0.1 GPa. Structural transitions of α-FAPbI<SUB>3</SUB> followed the sequence of <I>Pm</I>3̅<I>m</I> → <I>P</I>4/<I>mbm</I> → <I>Im</I>3̅ → partial amorphous during compression to 6.59 GPa, whereas the δ-phase converted to an orthorhombic <I>Cmc</I>2<SUB>1</SUB> structure between 1.26 and 1.73 GPa. During decompression, FAPbI<SUB>3</SUB> recovered the <I>P</I>6<SUB>3</SUB><I>mc</I> structure of the δ-phase as a minor component (∼18 wt %) from 2.41-1.40 GPa and the <I>Pm</I>3̅<I>m</I> structure of the α-phase becomes dominant (∼82 wt %) at 0.10 GPa but with an increased fraction of δ-FAPbI<SUB>3</SUB>. The photoluminescence behaviors from both the α- and δ-forms were likely controlled by radiative recombination at the defect levels rather than band-edge emission during pressure cycling. FAPbI<SUB>3</SUB> polymorphism is exquisitely sensitive to pressure. While modest pressures can engineer FAPbI<SUB>3</SUB>-based photovoltaic devices, irreversible δ-phase crystallization may be a limiting factor and should be taken into account.</P> [FIG OMISSION]</BR>

重建?北老工?基地???展的社?基?

Liu ShaoJie(?少杰) 한국사회학회 2003 한국사회학회 기타간행물 Vol.- No.-