Synthesis and Magnetic Properties of FeCo Alloy Nanowires via AC Frequency Conversion Electrodeposition

Lirong Wang,Shunzhen Feng,Tingting Lu,Lizhen Zhen,Jiwei Zhang,Lihu Liu 한국자기학회 2022 Journal of Magnetics Vol.27 No.3

Binary alloy nanowires of Fe3Co7 system are synthesized in the highly ordered porous anodic aluminum oxide (PAA) templates by AC frequency (5, 50, 120, and 200 Hz) conversion electrodeposition method. High resolution field emission transmission electron microscope (HRTEM) and Lorenz TEM (LTEM) were used to study the morphology and the magnetic domain structure of the Fe3Co7 alloy nanowires, respectively. Magnetic measurements showed that the M-H curves presented a discontinuity in a restricted magnetic field, but with high squareness (about 90 %). Quantitative local measurements of the magnetic properties of the nanowires are explored by differential phase contrast (DPC) imaging. The magnetic properties, however, were significantly affected by the AC frequency, which is correlated with the specific magnetic structure formation of Bloch line. We reported herein a detailed investigation on Fe3Co7 alloy nanowires and their magnetic properties.

An Approach Based on Statistical Features to Fall Detection

Hui Wang,Xiaohe Chen,Xingyu Wu,XinjianChen,Lirong Wang 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.12

Falls in elderly is a very serious health problem. For these years, the wearable devices based on tri-axial accelerator has been proven to be an effective way to fall detection. Most current methods for fall detection are based on threshold and machine learning. A approach based on statistical features was proposed to distinguish falls and normal activities of daily living(ADL) in this paper. What is worth mentioning is that Kernel Principal component analysis(KPCA) is firstly used to extract the statistical features from the original 3D data of acceleration, we don’t need to design features specially. The support vector machine (SVM) algorithm and K-Nearest Neighbor(KNN) algorithm are combined for prediction. Finally the validation of the prediction is done to improve the accuracy. Algorithm is mainly conducted on the public databases(UCI). And our method obtained the result is proved to be better compared with the other literature based on this public databases.

Network Characteristics Analysis of Microblog Public Opinion

Lirong Qiu,Jie Li,Zhen Hai Zhang,Yi Lei Wang 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.10

This paper uses public opinion propagation structure of Sina microblog as research object, it sets up simulation model of public opinion propagation structures based on complex network theory. Through the analysis of the degree distribution, clustering coefficient and community structure of the model, the validity of the model has been well confirmed. The paper also conducts research and analysis towards propagation quantity of the hot topic within 800 well-known spread microblog from 2013 to 2015, the paper establishes a community structure, through the simulation and demonstration of the community structure, it declares the community structure characteristic under the complex network environment.

The effect of interaction between La2AlCoO6 and CuCl2 on ethane oxychlorination

Lirong Yang,Ruisheng Hu,Huan Li,Yun Jia,Qihua Zhou,Hongye Wang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-

Supported perovskite-type catalyst La2AlCoO6–CuCl2–g-Al2O3 was synthesized by impregnation–sol– gel–mechanical-mixing methods and characterized by means of XRD, BET, H2-TPR, XPS, O2-TPD and TGDSC techniques. It is found that there is a strong interaction between La2AlCoO6 and CuCl2. The catalyst La2AlCoO6–CuCl2–g-Al2O3 reduces the reduction activation energy of Cu2+! Cu+ and increases the amount of surface adsorbed oxygen species, which are advantageous to the transition of redox group Cu2 +/Cu+, therefore promote the catalytic performance. The catalyst La2AlCoO6–CuCl2–g-Al2O3 shows a superior catalytic activity for ethane oxychlorination with the C2H6 conversion of 100% and the C2H3Cl selectivity to 43.8%.

Association of multiple anthropometric indices with in 944,760 elderly Chinese people

Lirong Dong,Yuanyuan Wang,Jinshui Xu,Yang Zhou,Guiju Sun,Dakang Ji,Haijian Guo,Baoli Zhu 한국역학회 2023 Epidemiology and Health Vol.45 No.-

OBJECTIVES: The aims of this study were to update the latest data on the prevalence of hypertension (HTN) in the elderly Chinese population and to assess relationships between new anthropometric indices and HTN. METHODS: Data were obtained from the Basic Public Health Service (BPHS) survey for Jiangsu Province, China. A total of 944,760 people aged 65 years and older were included in this study. Blood pressure was measured by trained investigators. Body weight, body mass index (BMI), waist circumference (WC), waist-to-height ratio (WtHR), conicity index (COI), body roundness index (BRI), and a body shape index (ABSI) were included in the analysis as anthropometric indices. Logistic regression analysis and restricted cubic splines were used to evaluate the association of anthropometric indices with HTN. RESULTS: The prevalence of HTN among elderly residents of Jiangsu Province was 64.7% (95% confidence interval, 64.6 to 64.8). After adjusting for multiple covariates, all anthropometric indices except ABSI showed significant non-linear positive dose-response associations with HTN across sex (pnonlinear<0.001). Among participants with BMI <28 kg/m2, abnormal weight, WC, WtHR, BRI, COI, and ABSI were positively associated with HTN. CONCLUSIONS: The prevalence of HTN in the elderly in Jiangsu Province is gradually increasing. It is necessary to consider the combination of ABSI and COI with BMI for screening elderly individuals for HTN in follow-up prospective studies.

Calibration of Ductile Fracture Criterion with Optimal Experiment Design and Prediction on Forming Limit for Aluminum Alloy Sheet

Lirong Sun,Zhongyi Cai,Jiaxin Gao,Mingwei Wang,Li Li 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.4

This paper is concerned with accurate prediction on the fracture strain and fracture forming limit curve (FFLC) by calibratingthe material constants by the specimens with reasonable shapes and sizes. The Lou–Huh ductile fracture criteria (DFC)in analytic and integral forms were adopted, and the theoretical formulas in various stress states were derived. The processand basis for calibrating the material constants of DFC by hybrid experimental–numerical method were described in detail. Moreover, the material constants calculated by different test groups including the uniaxial tensile, plane strain and shearspecimens with different shapes and sizes vary enormously, and the optimal test group was determined to calibrate the materialconstant of DFC. Meanwhile, it can be found that the different material constants greatly impact on the magnitude andshape of the fracture strain and FFLC, and the effect of each material constant on the fracture strain and FFLC was analyzedand compared in this paper. Finally, the FFLCs theoretically calculated by DFC in analytic and integral forms were verifiedby the experimental forming limiting data of the bulge test.

3-D Hexagonal Close-Packed Nano-Structure from Self-Organization of Triblock Copolymer Containing Lateral Ethyl Groups in the Middle of Rod Segment

Zhuoshi Wang,Lirong Tian,Zhegang Huang,Bingzhu Yin,Tie Chen,Long Yi Jin 한국고분자학회 2013 Macromolecular Research Vol.21 No.6

We report an unusual 3-D hexagonal supramolecular nano-structure via self-assembly of a coil-rod-coil molecule in the solid state. The rod-coil molecule consists of five biphenyls linked together with ether bonds as a rod segment, incorporating lateral ethyl groups in the center of the rod segment, and poly(propylene oxide) (PPO)with a degree of polymerization of 17 as coil segments. The molecular structure was characterized by 1H NMR and matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectroscopy. The self-assembling behavior of the molecule was investigated by means of differential scanning calorimetry, polarized optical microscopy and small angle X-ray scattering reveals that the lateral ethyl groups in the center of rod segment and the PPO coil segments strongly induce the molecule to self-assemble into the 3-D hexagonal close-packed nano-structure in the solid state.

Fabrication of N-doped Reduced Graphene Oxide/Ag3PO4 Nanocomposite with Excellent Photocatalytic Activity for the Degradation of Organic Pollutants

Longhai Feng,Lirong Kong,Zhenyuan Ji,Yi Wang,Xiaoping Shen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.1

An efficient N-doped reduced graphene oxide (N-RGO)/Ag3PO4 nanocomposite with enhanced photocatalytic activity has been prepared through a facile solution-based approach. Since N-RGO could offer more sites for the anchoring of Ag3PO4 nanoparticles, and effectively promote the charge carriers separation and transfer due to its high electrical conductivity, the photocatalytic activity of N-RGO/Ag3PO4 nanocomposite is much higher than bare Ag3PO4 and N-RGO in the degradation of phenol pollutant under simulated solar light irradiation. The mechanism for the photocatalytic process was also investigated. The excellent photocatalytic performance makes the N-RGO/Ag3PO4 nanocomposite a promising photocatalyst for organic pollutant treatment.

车天辂《五山说林》解李白诸条辨析

王?霞(Wang-Hongxia),任利?(Ren-Lirong) 동아인문학회 2016 동아인문학 Vol.34 No.-

WuShanShuoLin(three volumes) was a representative work in the Koryo period of the north korea whose writer was Che-Tianlu. Che- Tianlu(1556~1615), named FuYuan and also was called WuShan、Lan Yu、JuShi、QingMiaoJuShi.His representative works are WuShanJi、WuShanShuoLin and so on. There are nine detail analysis in the book WuShanShuoLin which writed by the Korean scholar Che-Tianlu on Li-Bai’s poems. Among them , four focus on collating the words or phrases; the rest are focus on discriminating the annotation of Li-Bai’s poems. All of them are reasonable and original. The analysis happened to coincide with lots of Chinese scholars and instructive.

Preparation of High-purity 1,3-Diacylglycerol Using Performanceenhanced Lipase Immobilized on Nanosized Magnetite Particles

Jiong-feng Zhao,Tao-Wang,Jianping Lin,Lirong Yang,Mian-bin Wu 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.2

Early research on the nutritional value of 1,3- diacylglycerols (1,3-DAGs) has resulted in a significant interest in their synthesis. 1,3-DAGs can be produced chemically and biologically. In this work, a regioselective lipase from Rhizopus oryzae was efficiently immobilized on nanosized magnetite particles (NSM) in an oriented way, resulting in significant enhancement of activity. The specific hydrolytic and esterification activities of the immobilized enzyme were 1,660% and 260% of those of the free enzyme, respectively. The immobilized enzyme was then used to catalyze the esterification of oleic acid with glycerol in a solvent-free system for preparation of 1,3-DAG in a 1 L reactor. The catalytic process was studied in detail, the final concentration of 1,3-DAG reached >76% under the optimal condition when the molar ratio of oleic acid to glycerol was 2.8:1. The regioselectivities of free and immobilized enzyme were both >97%. The immobilized enzyme was reused for 55 cycles with only ~30% activity loss at 30ºC. The purity of 1,3-DAG was up to ~95% (w/w) after a simple purification step with the recovery ratio ~85%. This is the first report of efficient 1,3-DAG purification by neutralization without acyl migration.