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Effect of lead sulfate on chloride ion transport properties in cementitious material
Xianfeng Wang,Yabin Yuan,Yingxin Huang,Tielin Han,Weilun Wang,Jian Liu,Feng Xing 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.S1
A novel microcapsule-based self-healing system was developed in Guangdong Key Laboratory of Durability in Coastal CivilEngineering to prolong the concrete service life, in which lead sulfate is used as the shell material of the microcapsules. Theself-healing system is triggered by the reaction of lead sulfate with chloride ion. In this study, the effect of lead sulfate onchloride ion transport in cement-based materials was investigated. The bulk diffusion and rapid chloride migration tests werecarried out. The time dependence of chloride diffusion was analysed based on the results of the Bulk diffusion test. The changein the microstructure of cement-based materials upon incorporation of lead sulfate was observed and analysed via mercuryintrusion porosimetry and scanning electron microscopy. Results showed that chloride-binding was prevalent at an immersionperiod of less than 90 days, while sulfate attack superseded after 90 days. Therefore, the impact of both factors needs to beconsidered when utilizing lead sulfate as a shell material in cementitious materials.
Xianfeng, Zhang,Xiaojuan, Li 대한원격탐사학회 2001 International Symposium on Remote Sensing Vol.17 No.1
The functionality of spatio-temporal analysis and modeling is a drive for Geographical Information Systems (GIS) to further applications in various applied fields and Digital Earth plan. However, currently commercial GIS systems lack those capabilities for spatio-temporal. distribution, prediction, and simulation of spatio-temporal data. So more effective and powerful modeling methods need to be developed. Cellular Automata Model (CA) provides GIS with a bottom-to-top spatio-temporal modeling framework, which is composed of a fourfold: cells, states, neighbors and rules. The simplicity and flexibility make CA able to simulate a variety of behaviors of complex systems, such as urban land use evolution. By expanding CA model to spatial domain and integrating CA with GIS, a new model (SUDS) for simulating urban land use evolution was established. To take Baotou City as a case study, this model was used to simulate the evolution of urban expansion and sustainable land use. This initial time is 1992 when land use data were acquired by aerial photography. The change data collected by differential GPS are used for model calibration. The appropriate extents of Baotou City development in 1998, 2005 and 2012 are simulated. The result of 1998 is consistent with the surveyed data with GPS. Thus, the established model can be used as a virtual laboratory for decision support in urban planning and land policy-making.
Xianfeng Zhu 한국정보처리학회 2023 Journal of information processing systems Vol.19 No.2
As the Internet has expanded and the continuous expansion of online shopping in China, many rural areas alsohave sales outlets. Due to the impact of economic conditions, rural locations have inadequate e-commercelogistical infrastructure, the number of outlets is small, and each other is in a decentralized state. For variousreasons, the advancement of rural e-commerce logistics lags far behind that in urban areas. As the Internet ofThings with big data grow in popularity, we can create and enhance the assurance system for the booming ecommercein rural areas by building the support system of rural online shopping platform, and strengtheningthe joint distribution of logistics terminals based on data mining, so as to encourage the quick and healthygrowth of rural online shopping.
Xianfeng Gong,Minwei Wang,Shin-ichi Tashiro,Satoshi Onodera,Takashi Ikejima 생화학분자생물학회 2006 Experimental and molecular medicine Vol.38 No.4
A terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL) assay was used to determine that apoptosis causes HeLa cell death induced by pseudolaric acid B. The c-Jun N-terminal kinase (JNK) inhibitor SP600125 decreased p53 protein expression during exposure to pseudolaric acid B. SP600125 decreased the phosphorylation of p53 during pseudolaric acid B exposure, indicating that JNK mediates phosphorylation of p53 during the response to pseudolaric acid B. SP600125 reversed pseudolaric acid B-induced down-regulation of phosphorylated extracellular signal-regulated pro-tein kinase (ERK), and protein kinase C (PKC) was activated by pseudolaric acid B, whereas stau-rosporine, calphostin C, and H7 partly blocked this effect. These results indicate that p53 is partially regulated by JNK in pseudolaric acid B-induced HeLa cell death and that PKC participates in pseudolaric acid B-induced HeLa cell death.
Xianfeng Gong,M inwei Wang,Zhen Wu,S hin -ichi T ashiro,Satoshi Onodera,Takashi Ikejima 생화학분자생물학회 2004 Experimental and molecular medicine Vol.36 No.6
Pseudolaric acid B was isolated from Pseudolarix kaempferi Gordon (Pinaceae) and was evaluated for the anti-cancer effect in HeLa cells. We ob-served that pseudolaric acid B inhibited cel proliferation and induced apoptosis in a time- and dose-dependent manner. HeLa cels treated with pseudolaric acid B showed typical characteristics of apoptosis including the morphological changes and DNA fragmentation. JNK inhibitor, SP60125, markedly inhibited pseudolaric acid B-induced cel death. In addition, Bcl-2 expression was down-re-gulated while Bax protein level was up-regulated. Caspase-3 inhibitor, z-DEVD-fmk, partially blocked pseudolaric acid B-induced cel death, and the expression of two classical caspase substrates, PARP and ICAD, were both decreased in a time- pase activation.
Xianfeng Yu,Zhuangning Xie,Ming Gu 대한토목학회 2019 KSCE Journal of Civil Engineering Vol.23 No.9
After considering the combination of internal pressure and external pressure acting on the roof, the coupling dynamic equations to describe the relationship between wind-induced internal pressure and flexible roof are reviewed and further refined. The internal pressure responses and the first order modal response of a flexible roof can be evaluated by the coupling equations. Wind tunnel test was carried out on an aeroelastic roof model which was treated as a single-degree-of-freedom system. Three factors, approaching wind velocities at the center of the dominant opening, acceleration responses at dominant opening areas and background leakages, which have effects on roof acceleration responses were studied. On this basis, the effectiveness and calculation precision of the coupling equations were verified. Results show that the root-mean-square (RMS) value of roof acceleration increases with the increase of the approaching wind velocity and dominant opening area, and in background leakage decreases. Meanwhile, theoretical calculation values of RMS internal pressure and RMS acceleration response corresponding to the first order modal of flexible roof agree well with the wind tunnel experimental data.
Linearized analysis of the internal pressures for a two-compartment building with leakage
Xianfeng Yu,Ming Gu,Zhuangning Xie 한국풍공학회 2019 Wind and Structures, An International Journal (WAS Vol.28 No.2
The non-linear equations governing wind-induced internal pressures for a two-compartment building with background leakage are linearized based on some reasonable assumptions. The explicit admittance functions for both building compartments are derived, and the equivalent damping coefficients of the coupling internal pressure system are iteratively obtained. The RMS values of the internal pressure coefficients calculated from the non-linear equations and linearized equations are compared. Results indicate that the linearized equations generally have good calculation precision when the porosity ratio is less than 20%. Parameters are analyzed on the explicit admittance functions. Results show that the peaks of the internal pressure in the compartment without an external opening (Compartment 2) are higher than that in the compartment with an external opening (Compartment 1) at lower Helmholtz frequency. By contrast, the resonance peak of the internal pressure in compartment 2 is lower than that in compartment 1 at higher Helmholtz frequencies.