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Search Results: 1 - 10 of 17184 matches for " Xuewen Fu "
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Template-Monomer Interaction in Molecular Imprinting: Is the Strongest the Best?  [PDF]
Xuewen Fu, Qiang Yang, Qiang Zhou, Qiang Lin, Chun Wang
Open Journal of Organic Polymer Materials (OJOPM) , 2015, DOI: 10.4236/ojopm.2015.52007
Abstract: Molecularly imprinted polymers (MIPs) represent a new class of materials possessing high selectivity and affinity for the target molecule. They have been utilized as sensors, catalysts, sorbents for solid-phase extraction, stationary phase for liquid chromatography, mimics of enzymes, receptors, and antibodies. In this research, molecular imprinted polymers (MIPs) for luteolin were prepared using acrylamide, 4-vinylpyridine and 1-allyl-piperazine as functional monomers and ethylene glycol dimethacrylate as cross-linker by non-covalent imprinting method. UV-visible spectra were used to evaluate the interaction strength between the template and the monomers. The composites of the polymers were calculated from elementary analysis. The porous properties of the imprinted polymers have been determined from nitrogen adsorption-desorption isotherms. The imprinting efficiency of the prepared MIPs was evaluated by selective adsorption for luteolin and its structural analogues. Although the interaction strength of monomers to the template was in the order 1-ALPP > 4-VP > AA, the binding affinity of the imprinted polymers towards luteolin was in the order MIP 2 > MIP 3 > MIP 1. Our results demonstrated that the imprinting efficiency was depending not only on the interaction strength between the template and the monomer, but also on the fidelity in transferring the complex into the polymer.
Empirical Analysis of Impact of Conversion ofConvertible Bonds on Corporate Performance of Different Industries in China  [PDF]
Hua Ding, Xuewen Lu
Open Journal of Statistics (OJS) , 2011, DOI: 10.4236/ojs.2011.12013
Abstract: We apply the methods of principle component analysis (PCA) and Wilcoxon’s signed rank test (WSRT) to study influence of conversion of convertible bonds on corporate performance of different industries in China. In this paper, 33 convertible bonds that were issued by non-financial sectors from 2002 to 2009 in China with the convertible rate more than 50% within a year were selected as a research sample. In order to provide a reference for the parties concerned, the influence of conversion of convertible bonds on corporate performance in different industries was studied from the industrial properties point of review.
Application of Google Earth in Modern River Sedimentology Research  [PDF]
Xuewen Zhou, Hongliang Wang
Journal of Geoscience and Environment Protection (GEP) , 2015, DOI: 10.4236/gep.2015.38001
Abstract: Google Earth, a software based on satellite’s images and database of navigation, gains features of high resolution, integrated images, quick update, convenience, simpleness and free cost. Practice of this software shows that it plays an important role in mapping, construction and river research. Based on the fundamental features of Google Earth, this passage makes an introduction to its application in studying modern river sedimentology through the case study of the Yellow River. The results show that Google Earth satellite’s high-resolution images and image overlay functions make it easy for users to quickly navigate river, determine the type of river, track the river flows and measure the terrain slope; the software’s “Ruler” and “Add Path” functions make it easy for users to measure channel width, curvature, amplitude, wavelength, size, morphology of point-bar and other river parameters; the software’s “Historical Image” function has important significance in the study of modern river migration, sedimentary evolution and river geomorphological shape during different seasons.
Fresh Fruits and Vegetables “Last Mile” Home Delivery in China Current Situation Research  [PDF]
Xuewen Zhang, Haifang Zhang
American Journal of Industrial and Business Management (AJIBM) , 2016, DOI: 10.4236/ajibm.2016.67080
Abstract: 2012 was named as “the first year of Fresh Electronic Commerce” in China. Then the Electronic Commerce of fresh and fresh home delivery obtained rapid development. Although the development speed of fresh home delivery is fast, it still could not meet the demand of Fresh Electronic Commerce. The aim of this paper is to analyze the current situation of development of “the last mile” of Chinese fresh delivery and put forward some suggestions can be adopted for fresh delivery terminal development.
Influence and Application of Cloud Logistics Mode on Express Service  [PDF]
Guangshu Xu, Xuewen Zhang
Open Journal of Applied Sciences (OJAppS) , 2016, DOI: 10.4236/ojapps.2016.68055
Abstract: In this paper, we first introduced the concept of cloud logistics, described the current status of the express delivery and analyzed the impacts of introducing cloud logistics on China’s express delivery industry. Then based on the case of Stars Express, how to introduce the cloud logistics model to the express industry was discussed. Finally, a new model of cloud logistics platform was constructed.
Hyperoxia disrupts pulmonary epithelial barrier in newborn rats via the deterioration of occludin and ZO-1
Kai You, Xuewen Xu, Jianhua Fu, Shuyan Xu, Xiaohong Yue, Zhiling Yu, Xindong Xue
Respiratory Research , 2012, DOI: 10.1186/1465-9921-13-36
Abstract: Newborn rats, randomly divided into two groups, were exposed to hyperoxia (95% oxygen) or normoxia for 1–7?days, and the severity of lung injury was assessed; location and expression of key tight junction protein occludin and ZO-1 were examined by immunofluorescence staining and immunobloting; messenger RNA in lung tissue was studied by RT-PCR; transmission electron microscopy study was performed for the detection of tight junction morphology.We found that different durations of hyperoxia exposure caused different degrees of lung injury in newborn rats. Treatment with hyperoxia for prolonged duration contributed to more serious lung injury, which was characterized by increased wet-to-dry ratio, extravascular lung water content, and bronchoalveolar lavage fluid (BALF):serum FD4 ratio. Transmission electron microscopy study demonstrated that hyperoxia destroyed the structure of tight junctions and prolonged hyperoxia exposure, enhancing the structure destruction. The results were compatible with pathohistologic findings. We found that hyperoxia markedly disrupted the membrane localization and downregulated the cytoplasm expression of the key tight junction proteins occludin and ZO-1 in the alveolar epithelium by immunofluorescence. The changes of messenger RNA and protein expression of occludin and ZO-1 in lung tissue detected by RT-PCR and immunoblotting were consistent with the degree of lung injury.These data suggest that the disruption of the pulmonary epithelial barrier induced by hyperoxia is, at least in part, due to massive deterioration in the expression and localization of key TJ proteins.
Tailoring exciton dynamics by elastic strain-gradient in semiconductors
Xuewen Fu,Cong Su,Qiang Fu,Xinli Zhu,Rui Zhu,Chuanpu Liu,Jun Xu,Ji Feng,Ju Li,Dapeng Yu
Physics , 2013,
Abstract: As device miniaturization approaches the atomic limit, it becomes highly desirable to exploit novel paradigms for tailoring electronic structures and carrier dynamics in materials. Elastic strain can in principle be applied to achieve reversible and fast control of such properties, but it remains a great challenge to create and utilize precisely controlled inhomogeneous deformation in semiconductors. Here, we take a combined experimental and theoretical approach to demonstrate that elastic strain-gradient can be created controllably and reversibly in ZnO micro/nanowires. In particular, we show that the inhomogeneous strain distribution creates an effective field that fundamentally alters the dynamics of the neutral excitons. As the basic principles behind these results are quite generic and applicable to most semiconductors, this work points to a novel route to a wide range of applications in electronics, optoelectronics, and photochemistry.
The study of the Index Wiener Integral processes on real domain R through haar wavelet
Xuewen Xia
International Journal of Engineering, Mathematics and Computer Sciences , 2013,
The Study of Wiener Processes with Linear-Trend Base on Wavelet
Xuewen XIA
Studies in Mathematical Sciences , 2012, DOI: 10.3968/j.sms.1923845220120402.1900
Abstract: In this paper,through wavelet methods,we obtain the wavelet alternation and wavelet express of a class of random processes– Wiener processes with linear trend,and analyse its some properties of wavelet alternation, and we obtain some new results. Key words Wiener processes; Linear trend; Wavelet alternation; Stochastics processes; Wavelet express; Power; Energy; System
The Analysis of A Class of Random Processes Base on Wavelet
Xuewen XIA
Studies in Mathematical Sciences , 2012, DOI: 10.3968/2250
Abstract: In this paper,through wavelet methods,we obtain the wavelet alternation and wavelet express of a class of random processes,and analyse the queer property of wavelet alternation. Key words: Wavelet alternation; Random processes; Queer property
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