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Yanmei Gao,Liang Fan,Weipeng Yang,Lu Shi,Dan Zhou,Ming Wang 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.45 No.3
The mechanical behaviors of the prefabricated steel-concrete composite beams are usually affected by the strength and the number of shear studs. Furthermore, the discrete degree of the arrangement for shear stud clusters, being defined as the clustering degree of shear stud λ in this paper, is an important factor for the mechanical properties of composite beams, even if the shear connection degree is unchanged. This paper uses an experimental and calculation method to investigate the influence of λ on the mechanical behavior of the composite beam. Five specimens (with different λ but having the same shear connection degree) of prefabricated composite beams are designed to study the ultimate supporting capacity, deformation, slip and shearing stiffness of composite beams. Experimental results are compared with the conventional slip calculation method (based on the influence of λ) of prefabricated composite beams. The results showed that the stiffness in the elastoplastic stage is reduced when λ is greater than 0.333, while the supporting capacity of beams has little affected by the change in λ. The slip distribution along the beam length tends to be zig-zagged due to the clustering of studs, and the slip difference increases with the increase of λ.
Yanmei Feng,Zhiqiang Wang,Yunfeng Yang,Xiang-Feng Wu,Xiaodong Gong,Yajian Liu,Yufei Li,Zuo-Lin Cao,Chao Wang,Xin Tong 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.7
The Ag2SO3/NaNbO3 hybrids have been fabricated via a facile method at room temperature. Several methods such as X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, scanning electron microscopy, electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy were used to characterize the samples. Moreover, the photocatalytic activity of the samples was assessed by degradation of rhodamine B and methyl orange under the visible light illumination. Experimental results indicated the photocatalytic degradation efficiency of the as-fabricated hybrids was first increased and then decreased with increasing the dosage of NaNbO3. When the molar ratio of Ag2SO3 to NaNbO3 was 1:0.7, the as-fabricated composites had the best photodegradation efficiency of 96.4% in 30 min for rhodamine B and 97.1% in 60 min for methyl orange, respectively. These were obviously higher than that of pure samples. Furthermore, Ag2SO3 was conjugated with NaNbO3 via chemical-bonds rather than physical contact. In addition, the possible photocatalytic degradation mechanism was also provided and the main roles during the process of photocatalytic degradation were played by holes.
Yanmei Liu,Yunna Sun,Yan Wang,Guifu Ding,Bin Sun,Xiaolin Zhao 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.1
A complex reinforced polymer interposer comprised with conductive Nicylinders, ordered Ni grid and SiC nano-whiskers/Polyimide (PI)composite was proposed. The conductive Ni cylinders distributing in themiddle of each Ni grid unite designed as the supporting structure wereused as electric connecting component for the interposer and wereinsulated by the SiC nano-whiskers/PI composite. The comprehensiveproperties of the complex reinforced polymer interposer were improvedby a complex reinforced mechanism: the improved thermal conductivityand mechanical strength by the Ni supporting structure and the reducedmetal/polymer interfacial mismatch due to the SiC nano-whiskers/PIcomposite with the optimized mixture ratio. The above complexreinforced polymer interposer and a traditional reinforced polymerinterposer only with Ni grid were fabricated using micro-machiningtechnology for comparative analysis. The comprehensive properties ofthese two polymer interposers were analyzed respectively. Comparedwith the traditional design, the comprehensive properties of the proposedcomplex reinforced polymer interposer were improved further, such as,21.3% increase for the Young modulus, 10.1% decrease for thecoefficient of thermal expansion (CTE) and 54.9% increase for thethermal conductivity. Such complex reinforced mechanism based on themetal ordered grid and random nano-whiskers has potential to expandthe applications of the polymer interposer.
Yanmei Zhou,Yue Li,Shujie Liu,Enyou Li 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.9
Sevoflurane, one of the most commonly used inhalation anesthetics, induces apoptosis and oxidative stress in lymphocytes. Propofol, an intravenous anesthetic, exhibits antiapoptotic and antioxidative activities. Therefore, the present study aimed to investigate whether propofol attenuates sevoflurane-induced cellular injury in human peripheral lymphocytes. Lymphocytes harvested from healthy volunteers were assigned to treatments with different concentrations of propofol, or 8% sevoflurane, or their combination. Propofol at concentrations of 5, 10 or 25 μg/mL had little effect, but 50 μg/mL propofol or 8% sevoflurane significantly reduced cell viability and mitochondrial membrane potential (ΔΨm), and increased cell apoptosis, activation of caspase-3 and the production of intracellular reactive oxygen species, compared with untreated cells. Five and ten μg/mL propofol attenuated the impact of sevoflurane on cell viability, apoptosis and ΔΨm, and 5, 10 and 25 μg/mL propofol inhibited the production of intracellular reactive oxygen species stimulated by sevoflurane. However, a combination of 50 μg/mL propofol and 8% sevoflurane led to more severe cellular injury than sevoflurane alone. The results suggest that propofol can attenuate sevoflurane-induced cellular injury of human peripheral lymphocytes in a concentration-dependent manner, providing a rational for the clinical use of sevoflurane combined with appropriate doses of propofol.
Yanmei Zhan,Leung, H.,Keun-Chang Kwak,Hosub Yoon IEEE 2009 IEEE transactions on instrumentation and measureme Vol.58 No.9
<P>An automated speaker recognition system for home service robots is proposed in this paper. In an uncontrolled environment, a speech classifier should be adaptive to different users and robust to noisy environments. It is usually observed that specific features and classifiers are more appropriate to parts of the problem domain than others; therefore, we propose a self-optimizing approach in which multiple feature extraction and classification techniques are simultaneously considered. The system uses a genetic algorithm to simultaneously select features and classifier, and the results from multiple classifiers are then combined using the Dempster-Shafer theory. The set of feature extractors used here includes linear-prediction coefficients, linear-prediction cepstral coefficients, mel-frequency cepstral coefficients, and bark-frequency cepstral coefficients, and the set of classifiers includes the Gaussian mixture model, support vector machines, C4.5 decision tree, <I>k</I> nearest neighbors, and multilayer perceptron neural network. The WEVER-R2 home service robot is used in a typical Korean home environment to collect speech signals for evaluating the performance of the proposed system for gender and age classification. Classification results show that the performance of the proposed method consistently outperforms the individual classifiers.</P>
Yanmei Jia,Hongwu Jiang,Yan Wang,Zhimei Liu,Peng Liang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10
The integration of agricultural by-products and natural fibers is increasingly welcomed for sustainablemanufacturing of functional textiles. This study presents a facile strategy for fabricating bio-based coloristic and ultraviolet(UV) protective cellulosic fabric pre-cationized with a chitosan derivative - hydroxypropyltrimethyl ammonium chloridechitosan (HACC) followed by simultaneous coloration and finishing using chestnut shell extract (CSE). Results revealed thatHACC significantly enhanced the CSE adsorption quantity on cellulose fibers due to the increased number of cationicbinding sites. Both cotton and viscose showed a good building up property indicating their potential for dark shade dyeing. Cotton displayed higher CSE adsorption improvement than viscose due to the higher adsorption quantity of HACC duringpre-cationization. The washing and rubbing fastness was rated as mediate to high level, which was contributed by theelectrostatic interactions between the cationized cellulose fiber and anionic CSE. Importantly, the ultraviolet protective factor(UPF) of treated cellulosic reached over 40 and well retained over 70 % after 10 repeated washings. In summary, thefabrication strategy for coloristic and functional cellulosic fabrics using two natural products introduced in this research,contributes to sustainable manufacturing of textile.
Cao, Yanmei 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.8
This paper develops a method based on a semi-analytical/FEM model to predict the ground vibrations induced by high-speed train running through continuous girder bridge. The prediction method has two steps: the solution of reaction on top of pier and the solution of ground vibrations. The reaction on pier top is solved by the semi-analytical dynamic interaction model for train-track-continuous girder bridge system, taking the dynamic characteristics of train, track, and bridge into account. The solution of ground vibrations is accomplished by establishing the 3-dimensional pile foundation-soil finite element model and then applying the negative reaction force got from pier top to the pile foundation-soil model. The effectiveness of the presented model is verified by comparing with other existed results.
Jin, Yanmei,Tan, Tu Quang,Zhang, Caiqiao Asian Australasian Association of Animal Productio 2009 Animal Bioscience Vol.22 No.3
Arachidonic acid (AA) is a polyunsaturated fatty acid that is a normal constituent of membrane lipids in animal cells. In addition to its role as a precursor of prostaglandins, AA itself may play an important role in the regulation of cell function. The effect of AA on functions of granulosa cells was investigated in pre-hierarchical small yellow follicles of laying hens. Immuno-cytochemical staining showed that AA ($10^{-7}-10^{-5}$ M) increased the expression of the extracellular matrix glycoprotein laminin, gap junction connexin 43 and protein kinase C (PKC). Therefore, mediated by the PKC signal pathway, AA may regulate the intercellular communication of granulosa cells and follicular development by increasing the expression of laminin and connexin.