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Journal of Rare Earths 2024年第1期42卷 228-236,I0008页

作者： Wen He Dunqiang Tan Zhiqiang Yi Zhiqiang Liu School of Materials Science and Engineering Nanchang UniversityNanchang330031China instrumental analysis center of nanchang hangkong university Nanchang330063China

In order to reduce or eliminate the adverse effects of calcium impurity,the interaction of Ca and rare earth Y co-doping on the preparation of WC-Co cemented carbides was investigated.X-ray diffraction,scanning electron microscopy and transmission electron microscopy were employed to analyze the phase compositions,particle sizes and morphologies of them,*** results show that the second type of"yttrium barrier effect"is observed and the adverse influence of Ca-rich phase on tungsten powder can be eliminated by *** flexural strength and fracture toughness of YG6-0.01%Ca+0.09%Y alloy are 2199.5 MPa and 11.49 MPa·m^(1/2),showing improvement of 6.5% and 2.7% compared to YG6 alloy,*** evolutions of Ca-rich phase and Y-rich phase at the every alloy preparation stage of WO_(3),W,WC and cemented carbides are ***,the strengthening mechanism of WC-Co cemented carbide with co-addition of Ca and Y is proposed.

关键词： Yttrium barrier effect Ca-rich phase WC-Co cemented Carbide Microstructures Mechanisms Rare earths

Cross-Project Software Defect Prediction Based on SMOTE and Deep Canonical Correlation analysis

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Computers, Materials & Continua 2024年第2期78卷 1687-1711页

作者： Xin Fan Shuqing Zhang Kaisheng Wu Wei Zheng Yu Ge School of Software Nanchang Hangkong UniversityNanchang330063China Software Testing and Evaluation center Nanchang Hangkong UniversityNanchang330063China

Cross-Project Defect Prediction(CPDP)is a method that utilizes historical data from other source projects to train predictive models for defect prediction in the target ***,existing CPDP methods only consider linear correlations between features(indicators)of the source and target *** models are not capable of evaluating non-linear correlations between features when they exist,for example,when there are differences in data distributions between the source and target *** a result,the performance of such CPDP models is *** this paper,this paper proposes a novel CPDP method based on Synthetic Minority Oversampling Technique(SMOTE)and Deep Canonical Correlation analysis(DCCA),referred to as *** Correlation analysis(CCA)is employed to address the issue of non-linear correlations between features of the source and target projects.S-DCCA extends CCA by incorporating the MlpNet model for feature extraction from the *** redundant features are then eliminated by maximizing the correlated feature subset using the CCA loss ***,cross-project defect prediction is achieved through the application of the SMOTE data sampling *** Under Curve(AUC)and F1 scores(F1)are used as evaluation *** paper conducted experiments on 27 projects from four public datasets to validate the proposed *** results demonstrate that,on average,our method outperforms all baseline approaches by at least 1.2%in AUC and 5.5%in F1 *** indicates that the proposed method exhibits favorable performance characteristics.

关键词： Cross-project defect prediction deep canonical correlation analysis feature similarity

Tuning the shell thickness of core-shell α-Fe_(2)O_(3)@SiO_(2) nanoparticles to promote microwave absorption

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Chinese Chemical Letters 2022年第2期33卷 957-962页

作者： Honghong Fu Yue Guo Jian Yu Zhen Shen Jie Zhao Yu Xie Yun Ling Sheng Ouyang Shiqi Li Wei Zhang Department of Materials Chemistry School of Environment and Chemical EngineeringNanchang Hangkong UniversityNanchang 330063China instrumental analysis center of nanchang hangkong university Nanchang 330063China School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210023China Research Institute of Aero-Engine Beihang UniversityBeijing 100191China School of Ecology and Environment Zhengzhou UniversityZhengzhou 450001China

Various advanced microwave absorbing materials have been developed for reducing/avoiding the harm of microwave *** them,core-shell structural nanomaterials have been widely fabricated for microwave ***,the“structure-performance”relationship between shell thickness and microwave absorption performance is rarely *** this paper,we first explored the“structure-performance”relationship between shell thickness and microwave absorption performance,based on the core-shellα-Fe_(2)O_(3)@SiO_(2)nanoparticles with a constantα-Fe_(2)O_(3)-core size and changeable SiO_(2)-shell *** increasing the SiO_(2)-shell thickness,the microwave absorption ability first increased,then *** a proper SiO_(2)-shell thickness of 35 nm,α-Fe_(2)O_(3)@SiO_(2)sample achieved the strongest microwave absorbing ability with a reflection loss minimum value of-4.3 d B,better than that of pureα-Fe_(2)O_(3)(-3.8 dB).This enhanced microwave absorption performance was mainly derived from the di-electric *** the absolute value of the reflection loss was relatively low(-4.3 d B),this study shed an important reference on designing next-generation advanced iron oxide-based materials for mi-crowave absorption.

关键词： α-Fe_(2)O_(3)@SiO_(2) Core-shell structure Microwave absorption Dielectric loss Interfacial polarization Conductivity loss

The First Two-dimensional Supramolecular Network Constructed by Na(Ⅰ) with 2-Methylimidazole-4,5-dicarboxylate Building Blocks

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Chinese Journal of Structural Chemistry 2011年第12期30卷 1770-1774页

作者：涂勇刚熊志强宋秀英聂旭亮温世和刘光斌 College of Food Science and Engineering Jiangxi Agricultural University instrumental analysis center Nanchang Hangkong University College of Science Jiangxi Agricultural University

The title complex [Na（H2MIA-）（H2O）]（1,H3MIA = 2-methyl-1H-imidazole-4,5-dicarboxylic acid） has been synthesized by hydrothermal synthesis and structurally characterized by X-ray *** 1 crystallizes in orthorhombic,space group ibam with a = 14.4737（19）,b = 17.553（2）,c = 6.5285（9）,V = 1658.6（4） 3,C6H7N2NaO5,Mr = 210.12,Z = 8,Dc = 1.675 g/cm3,F（000） = 864,μ = 0.188 mm-1,λ（MoKα） = 0.071073 ,R = 0.0383 and wR = 0.0987 for 1046 observed reflections（I 2σ（I））.In the structure of 1,each coordination water coordinates with two Na（I） ions at the same time and links the neighboring Na（I） ions to form a one-dimensional Na（I）-water *** H2MIA-ligand links the neighboring Na（I） of Na（I）-water chain to form a novel two-dimensional supramolecular *** 2-D network is stabilized by O-H…N hydrogen bonds and π-π *** 2D network is further linked via O-H…O hydrogen bonds to yield a three-dimensional framework.

关键词： Na 2-methyl-1H-imidazole-4 5-dicarboxylic acid hydrothermal synthesis crystal structure

Review of preferentially selective lithium extraction from spent lithium batteries: Principle and performance

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Journal of Energy Chemistry 2023年第3期78卷 253-261,I0008页

作者： Zhe Gao Meiting Huang Liming Yang Yufa Feng Yuan Ding Penghui Shao Xubiao Luo National-Local Joint Engineering Research center of Heavy Metals Pollutants Control and Resource Utilization Nanchang Hangkong UniversityNanchang 330063JiangxiChina

Lithium,as the lightest and lowest potential metal,is an ideal "battery metal" and the core strategic metal of the new energy industry *** lithium from spent lithium batteries(LIBs)has become one of the significant approaches to obtaining lithium *** present,the lithium extraction being generally placed at the last step of the spent LIBs recovery process has puzzles such as high acid consumption,low Li recovery purity and low recovery *** lithium extraction at the first step of the recovery process can effectively solve those *** lithium leaching is a non-spontaneous reaction requiring additional energy to achieve,it is found that these methods can be divided into five ways according to the different types of energy driving the reaction occurring:(ⅰ)electric energy driving lithium extraction;(ⅱ) chemical energy driving lithium extraction;(ⅲ) mechanical energy driving lithium extraction;(ⅳ) thermal energy driving lithium extraction;(ⅴ) other energy driving lithium *** the analysis of the principle,reaction process and results of recovering lithium methods can provide a few directions for scholars’ subsequent *** is necessary to speed up the exploration of the principle of these *** is expected that this study could provide a reference for the research on the selective lithium extraction.

关键词： Lithium Spent lithium batteries(LIBs) Recovery efﬁciency Preferentially Selective

Formation of high-density cold molecules via electromagnetic trap

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Chinese Physics B 2022年第10期31卷 371-376页

作者： Ya-Bing Ji Bin Wei Heng-Jiao Guo Qing Liu Tao Yang Shun-Yong Hou Jian-Ping Yin State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200241China Key Laboratory of Nondestructive Test(Ministry of Education) Nanchang Hangkong UniversityNanchang 330063China Collaborative Innovation center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Preparation and control of cold molecules are advancing rapidly, motivated by many exciting applications ranging from tests of fundamental physics to quantum information processing. Here, we propose a trapping scheme to create high-density cold molecular samples by using a combination of electric and magnetic fields. In our theoretical analysis and numerical calculations, a typical alkaline-earth monofluoride, MgF, is used to test the feasibility of our proposal.A cold MgF molecular beam is first produced via an electrostatic Stark decelerator and then loaded into the proposed electromagnetic trap, which is composed of an anti-Helmholtz coil, an octupole, and two disk electrodes. Following that,a huge magnetic force is applied to the molecular sample at an appropriate time, which enables further compressing of the spatial distribution of the cold sample. Molecular samples with both higher number density and smaller volume are quite suitable for the laser confinement and other molecular experiments such as cold collisions in the next step.

关键词： Stark effect Zeeman effect cold molecules

Two-dimensional RGO-bridge S-scheme phosphorus-doped g-C_(3)N_(4)/Bi_(5)O_(7)Ivan der Waals heterojunctions for efficient visible-light photocatalytic treatment of real pharmaceutical wastewater

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Science China(Technological Sciences) 2023年第10期66卷 3011-3024页

作者： WANG ZhenZhou XU XiWei DENG Fang DIONYSIOU Dionysios D LI XiBao PENG JunLong LUO XuBiao ZOU JianPing LUO ShengLian National-Local Joint Engineering Research center of Heavy Metal Pollutants Control and Resource Utilization Nanchang Hangkong UniversityNanchang 330063China Environmental Engineering and Science Program Department of Chemical and Environmental Engineering(DChEE)University of CincinnatiCincinnati 45221-0012USA

The design of van der Waals heterojunctions with S-scheme charge transfer pathway is expected to be an effective strategy for improvement of photocatalytic ***,two-dimensional(2D)phosphorus-doped g-C_(3)N_(4)/Bi_(5)O_(7)Ivan der Waals heterojunctions with reduced graphene oxide as electron bridge(PCN/RGO/Bi_(5O)_(7)I)were successfully synthesized via hydrothermal *** van der Waals interaction endowed 2D PCN/RGO/Bi_(5O)_(7)I with intimate contact interface,lattice match,tunable band structure,and internal electric field,which efficiently promoted interfacial charge separation and enhanced redox ability of photogenerated charge *** a result,the S-scheme PCN/RGO/Bi_5O_7I van der Waals heterojunctions exhibited superior photocatalytic performance in ciprofloxacin degradation and real pharmaceutical wastewater *** optimized 12%PCN/RGO/Bi_5O_7I displayed the highest photocatalytic activity with 92%removal of ***,the COD removal efficiency and extent of mineralization of real pharmaceutical wastewater reached 66.9%and 59.8%,respectively,and the biodegradability of pharmaceutical wastewater was significantly *** photocatalytic mechanism of the S-scheme PCN/RGO/Bi_(5)O_(7)I van der Waals heterojunctions based on the analysis of reactive species,work function,and internal electric field was *** study provides fresh insights into plausible design of S-scheme van der Waals heterojunction to enhance photocatalytic redox ability.

关键词： S-scheme heterojunction van der Waals heterostructure photocatalytic degradation ciprofloxacin energy consumption

Enhancement of Fenton oxidation for removing organic matter from hypersaline solution by accelerating ferric system with hydroxylamine hydrochloride and benzoquinone

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Journal of Environmental Sciences 2016年第3期28卷 16-23页

作者： Siwei Peng Weijun Zhang Jie He Xiaofang Yang Dongsheng Wang Guisheng Zeng Key Laboratory of Jiangxi Province for Ecological Diagnosis-Remediation and Pollution Control Nanchang Hangkong University State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of Sciences

Fenton oxidation is generally inhibited in the presence of a high concentration of chloride *** study investigated the feasibility of using benzoquinone（BQ） and hydroxylamine hydrochloride（HA） as Fenton enhancers for the removal of glycerin from saline water under ambient temperature by accelerating the ferric *** was found that organics removal was not obviously affected by chloride ions of low concentration（less than 0.1 mol/L）,while the mineralization rate was strongly inhibited in the presence of a large amount of chloride *** addition,ferric hydrolysis-precipitation was significantly alleviated in the presence of HA and BQ,and HA was more effective in reducing ferric ions into ferrous ions than HA,while the H_2O_2 decomposition rate was higher in the BQ-Fenton *** spin resonance analysis revealed that OH production was reduced in high salinity conditions,while it was enhanced after the addition of HA and BQ（especially HA）.This study provided a possible solution to control and alleviate the inhibitory effect of chloride ions on the Fenton process for organics removal.

关键词： Saline solution Fenton oxidation Hydroxyl radicals Benzoquinone Hydroxylamine hydrochloride

A pyrazine based metal-organic framework for selective removal of copper from strongly acidic solutions

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Frontiers of Environmental Science & Engineering 2023年第3期17卷 75-86页

作者： Jiachuang Shao Penghui Shao Mingming Peng Min Li Ziwei Yao Xiuqin Xiong Caiting Qiu Yufan Zheng Liming Yang Xubiao Luo Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource utilizationNanchang Hangkong UniversityNanchang 330063China Department of Chemical Engineering Chongqing University of Science and TechnologyChongqing 401331China

The selective capture of copper from strongly acidic solutions is of vital importance from the perspective of sustainable development and environmental *** organic frameworks(MOFs)have attracted the interest of many scholars for adsorption due to their fascinating physicochemical characteristics,including adjustable structure,strong stability and ***,pz-UiO-66 containing a pyrazine structure is successfully synthesized for the efficient separation of copper from strongly acidic *** copper removal at low pH values is accomplished by using this material that is not available in previously reported metal–organic ***,the material exhibits excellent adsorption capacity,with a theoretical maximum copper uptake of 247 mg/*** proven by XPS and FT-IR analysis,the coordination of pyrazine nitrogen atoms with copper ions is the dominant adsorption mechanism of copper by *** work provides an opportunity for efficient and selective copper removal under strongly acidic conditions,and promises extensive application prospects for the removal of copper in the treatment for acid metallurgical wastewater.

关键词： Pyrazine Metal-organic frameworks Copper removal Strong acidity High selectivity

Modal analysis of subway tunnel in soft soil during operation

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Underground Space 2023年第1期8卷 181-195页

作者： Ling Wan Xiongyao Xie Lujun Wang Pan Li Qiang Huang College of Civil Engineering and Architecture Nanchang Hangkong UniversityNanchang 330063China Jiangxi Transportation Institute Co LtdNanchang 330200China Key Laboratory of Geotechnical and Underground Engineering Ministry of EducationTongji UniversityShanghai 20092China center for Hypergravity Experimental and Interdisciplinary Research MOE Key Laboratory of Soft Soils and Geoenvironmental EngineeringCollege of Civil Engineering and ArchitectureZhejiang UniversityHangzhou 310058China Institute of Geotechnical Engineering Ningbo UniversityNingbo 315211China

Modal parameters are of great significance in civil engineering because they can characterize the properties of structures and be used for vibration control and structural health *** tunnels are long linear truss structures combined with the mutual cou-pling of the surrounding ***,the operational modal analysis of a mutual coupling tunnel is complicate,as is the modal iden-tification of shield tunnels in a time–frequency domain,and these are hot civil engineering *** the shield tunnel of Shanghai metro line No.12 project as a case study,we carried out the vibration response monitoring of a subway tunnel during operation and presented methods to identify structural modal *** modal parameters of lower vibration modes were estimated using response *** frequencies and shapes were identified with high precision and accuracy using the orthogonal polynomial clustering algorithm under hammer excitation conditions and the autoregressive-moving-average model under ambient excitation *** dynamic behavior of a mutual coupling tunnel presented obvious low frequency characteristics,and the first 9th order mode frequencies were less than 100 *** diagonal values of the modal assurance criteria were all greater than *** modal parameters can be used for the health monitoring of operational subway tunnels.

关键词： Monitoring method Modal identification Vibration response Operational subway tunnel