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Jianmin Shi,Xiaodai Jia,Yan Xing,Xiuxiu Bu,Qiang Lei,Qunqun Sun 아시아스포츠융합과학회 2023 Asia Pacific Journal of Applied Sport Sciences Vol.4 No.1
PURPOSE Based on theoretical evidence and previous literature, this study proposes research hypotheses and establishes a structural equation model (SEM) that includes variables such as motivation, goal orientation, satisfaction, and adherence. METHOD Study participants included skiers at the ski resorts located around Beijing. In total, 700 questionnaires were distributed, and 44 invalid questionnaires were removed for being incomplete or incorrect; 656 questionnaires were retained and analyzed using SPSS v. 26 and Amos v. 23. Descriptive statistics, exploratory factor analysis, confirmatory factor analysis, and structural equation modeling methods were used in the analyses. RESULT This study explored the relationship between motivation, goal orientation, satisfaction, and adherence in skier participants through a quantitative analysis. Through the establishment and verification of the structural equation mode, the following conclusions were drawn: First, motivation directly affects goal orientation. Second, motivation directly affects satisfaction. Third, motivation directly affects adherence. Fourth, goal orientation directly affects satisfaction. Fifth, goal orientation directly affects adherence. Sixth, satisfaction directly affects adherence. CONCLUSION To improve skiing adherence, Beijing ski resort operators should understand the motivation for skiing, formulate supporting policies and services, and enhance the goal orientation and satisfaction of skiers. This study provides some practical implications for ski resort operators that may increase the profit of ski resorts contribute to the sustainable development of Beijing skiing.
Xin Zhang,Jianmin Zhao,Xinghui Zhang,Xianglong Ni,Haiping Li,Fucheng Sun 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.3
Gearbox compound fault pattern recognition is challenging because of its complexity and non-stationarity of the vibration signal. In this study is proposed a novel hybrid method based on narrow band interference canceller (NIC), multifractal detrended fluctuation analysis (MFDFA) and support vector machine optimized by whale optimization algorithm (WOASVM) for compound fault pattern recognition of gearbox. Specifically, the raw signal is processed by NIC to filter the deterministic signal which interferes with the fault signal, and then the multifractal features are extracted from the residual signal via MFDFA. Finally, the compound fault pattern is identified via WOASVM. Compound fault experiments of a gearbox under fixed condition and variable condition were done to evaluate the performance of the proposed method. The results show that the proposed method can effectively identify the compound faults and it outperforms other methods mentioned in this paper.
A Detection Framework of Malicious Code Based on Multi-Classifiers Ensemble
Chao Dai,Jianmin Pang,Feng Yue,Pingfei Cui,Di Sun,Liang Zhu 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.6
Malicious code detection is one of the important missions of malicious code analysis. Current researches on the detection of malicious code mostly focused on single classifier, whereas the single classifier is not suitable for the detection based on features of different types. We utilized multi-classifiers ensemble based on fuzzy integral to improve the accuracy of the detection framework. A framework based on the Choquet fuzzy integral was proposed to fuse the analysis results of the base classifiers with different features. And the genetic algorithm was used to obtain the fuzzy measure. Finally, the result of Choquet fuzzy integral was compared to a threshold predefined to determine the maliciousness of binary code. Experiment showed that the framework proposed in this paper could be used to determine the maliciousness of binary code more accurately.
Weak magnetic field accelerates chromate removal by zero-valent iron
Feng, Pian,Guan, Xiaohong,Sun, Yuankui,Choi, Wonyong,Qin, Hejie,Wang, Jianmin,Qiao, Junlian,Li, Lina Elsevier 2015 Journal of environmental sciences Vol.31 No.-
<P>Weak magnetic field (WMF) was employed to improve the removal of Cr(VI) by zero-valent iron (ZVI) for the first time. The removal rate of Cr(VI) was elevated by a factor of 1.12-5.89 due to the application of a WMF, and the WMF-induced improvement was more remarkable at higher Cr(VI) concentration and higher pH. Fe2+ was not detected until Cr(VI) was exhausted, and there was a positive correlation between the WMF-induced promotion factor of Cr(VI) removal rate and that of Fe2+ release rate in the absence of Cr(VI) at pH4.0-5.5. These phenomena imply that ZVI corrosion with Fe2+ release was the limiting step in the process of Cr(VI) removal. The superimposed WMF had negligible influence on the apparent activation energy of Cr(VI) removal by ZVI, indicating that WMF accelerated Cr(VI) removal by ZVI but did not change the mechanism. The passive layer formed with WMF was much more porous than without WMF, thereby facilitating mass transport. Therefore, WMF could accelerate ZVI corrosion and alleviate the detrimental effects of the passive layer, resulting in more rapid removal of Cr(VI) by ZVI. Exploiting the magnetic memory of ZVI, a two-stage process consisting of a small reactor with WMF for ZVI magnetization and a large reactor for removing contaminants by magnetized ZVI can be employed as a new method of ZVI-mediated remediation.</P>
Li, Jianhui,Yuan, Jianmin,Guo, Yuming,Sun, Qiujuan,Hu, Xiaofei Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.4
A $2{\times}2$ factorial experiment was conducted to study the effect of dietary calcium and non-phytate phosphorus (nPP) imbalance on calbindin and NaPi-IIb mRNA levels in the small intestine and tibia parameters of broiler chicks. One hundred and forty four 1-d-old Arbor Acres male broiler chicks were divided into four treatments consisted of six replicates with six chicks each. The two dietary calcium levels were 1.10% and 0.60%, and two dietary nPP levels were 0.50% and 0.27%. Results showed that a high Ca/nPP ratio diet (4.07:1) significantly depressed feed intake and weight gain of broilers (p<0.05), but a lower Ca:nPP ratio (1.2:1) had no influence (p>0.05). Low-Ca with low-P diet resulted in low tibia minerals and tibia breaking strength of broilers, and all the tibia parameters were further decreased when the dietary ratio of Ca to P was relative higher. Low dietary Ca or P up-regulated the calbindin and NaPi-IIb mRNA expression levels. Low Ca with normal P diet up-regulated duodenal calbindin mRNA expression level to the greatest extent. Low P with a normal Ca diet significantly enhanced NaPi-IIb mRNA expression level to the highest extent. These results suggest that the calbindin and NaPi-IIb mRNA expression were enhanced by the imbalance between dietary Ca and nPP, and their expression were not only influenced by Ca or nPP level, but also the ratio of Ca:nPP.
Chunlei Wang,Juntao Yan,Jianfen Li,Jianmin Sun 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.9
A series of hierarchical mesoporous ZSM-5 zeolites with different morphology were successfully syn-thesized by the CO2-in-water microemulsion method, and mesoporosity was formed without organotemplate. The dif-ferent synthesis conditions, including silica alumina molar ratio, stirring time and compressed CO2 pressure, were sys-tematically investigated to discuss the influence of these conditions on the morphology of ZSM-5 zeolite. The resultingsamples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), inductively coupledplasma (ICP) and nitrogen adsorption-desorption measurement. XRD results indicated that compressed CO2 route forthe synthesis of MFI zeolites had a fast crystallization rate and good crystallinity. SEM images showed that the ZSM-5hierarchical mesoporous ZSM-5 zeolite had a uniform chain-like crystal morphology, whereas silicalite-1 displayed amonodisperse crystal morphology. In addition, the nitrogen adsorption-desorption measurement provided sufficientevidence for the presence of hierarchical mesopores in ZSM-5 zeolite.
Fan, Qinghua,Noh, Hyuk-Jun,Wei, Zengxi,Zhang, Jiakui,Lian, Xin,Ma, Jianmin,Jung, Sun-Min,Jeon, In-Yup,Xu, Jiantie,Baek, Jong-Beom Elsevier 2019 Nano energy Vol.62 No.-
<P><B>Abstract</B></P> <P>Although lithium ion batteries (LIBs) hold great promise as a next generation power supply, the poor rate capability of the graphite that is mainly used as the battery anode limits high-performance LIBs. Compared to other reported carbon-based materials, however, its relatively low average working voltage still makes it attractive. Herein, we were able to introduce carbon disulfide (CS<SUB>2</SUB>) at the edges of graphene nanoplatelets (GnPs) with rich –C=S/-C-S bonds <I>via</I> ball-milling graphite in the presence of CS<SUB>2</SUB>. The resultant edge-thionic acid-functionalized GnPs (TAGnPs) exhibited a larger accessible surface area and smaller particle size than pristine graphite. Importantly, the TAGnPs retained a long-range-ordered layered structure similar to pristine graphite. When the TAGnPs were used as anode materials for LIBs, they displayed superior rate capability (<I>e.g.</I>, high average reversible capacities of 228.3, 208.1, 141.0 and 80.6 mAh g<SUP>−1</SUP> at 0.5, 1, 2 and 5 A g<SUP>−1</SUP>, respectively) compared to pristine graphite and the reference edge-hydrogenated GnPs (HGnPs), which mainly have -C-H bonds at their edges. Theoretical calculations also indicated that the presence of –C=S/-C-S bonds at the edges of TAGnPs enabled stronger Li<SUP>+</SUP> adsorption capability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Edge-thioated graphene nanoplatelets (TAGnPs) prepared by ball-milling graphite in the presence of carbon disulfide (CS<SUB>2</SUB>). </LI> <LI> TAGnPs have long-range-ordered structure similar to graphite. </LI> <LI> The TAGnPs have a larger accessible surface area than graphite. </LI> <LI> TAGnPs exhibit superior rate capability (>0.5 A g<SUP>−1</SUP>). </LI> <LI> TAGnPs reveal high average reversible capacities of 228.3, 208.1, 141.0 and 80.6 mAh g<SUP>−1</SUP>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>