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Search Results: 1 - 10 of 120053 matches for " Xuewen Wang "
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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.
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.
Acute Impact of Moderate-Intensity and Vigorous-Intensity Exercise Bouts on Daily Physical Activity Energy Expenditure in Postmenopausal Women
Xuewen Wang,Barbara J. Nicklas
Journal of Obesity , 2011, DOI: 10.1155/2011/342431
Abstract: This study determined whether performing a single moderate- or vigorous-intensity exercise bout impacts daily physical activity energy expenditure (PAEE, by accelerometer). Overweight/obese postmenopausal women underwent a 5-month caloric restriction and moderate- (=18) or vigorous-intensity (=18) center-based aerobic exercise intervention. During the last month of intervention, in women performing moderate-intensity exercise, PAEE on days with exercise (577.7±219.7 kcal·d−1) was higher (=.011) than on days without exercise (450.7±140.5 kcal·d−1); however, the difference (127.0±188.1 kcal·d−1) was much lower than the energy expended during exercise. In women performing vigorous-intensity exercise, PAEE on days with exercise (450.6±153.6 kcal·d−1) was lower (=.047) than on days without exercise (519.2±127.4 kcal·d−1). Thus, women expended more energy on physical activities outside of prescribed exercise on days they did NOT perform center-based exercise, especially if the prescribed exercise was of a higher intensity.
Preparation and Performance Research of CuInSe2 Materials Applied in Solar Cell  [PDF]
Xuewen Wang, Yuan Zhang, Zhouhu Deng, Yujue Wang, Zidong Wang, I. Shih
Journal of Crystallization Process and Technology (JCPT) , 2012, DOI: 10.4236/jcpt.2012.24020
Abstract: At present, CuInSe2 (referred to as CIS) semiconductor has become one of the hot points in solar cell field at home and abroad for its excellent performances, such as direct bandgap, high light absorption coefficient, high photoelectric conversion efficiency and long-term stability. In this paper, the CIS bulk materials are prepared by the horizontal Bridgman method with double-heat sources, the crystal structure, microstructure morphology and composition of the samples are analyzed in X-ray diffraction instrument (XRD) and scanning electronic microscope (SEM) with Energy Dispersive X-ray Spectrum (EDX), and surface electrical state and electrical properties of the samples are characterized in X-ray photoelectron spectroscopy (XPS) and four point resistivity test system. The results show that the CIS crystal was grown, and that the conductive performance of the samples is good which display the characteristics of p-type semiconductor. Furthermore, a thin film CIS sample was obtained by argon ion-beam scanning bombardment, and it has high solar energy absorptivity and the bandgap of 0.99 eV analyzed in Ultraviolet-visible Spectrum that is suitable for solar cell. Keywords: Solar
Theoretical Study on the Optical and Electrical Properties of AlxGa1-xN Crystals  [PDF]
Xuewen Wang, Yuzhou Jing, Xinkang Zhu, Chan Liu, Jiangni Yun, Zhiyong Zhang
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.43A063
Abstract:
By making use of the density functional theory (DFT) of the first principles and generalized gradient approximation method, the electronic structures and properties of ideal GaN and AlxGa1-xN crystals (x = 0.25, 0.5, 0.75) have been calculated and analyzed, and the influence of the doping quantity of x on the characteristics of AlxGa1-xN has been studied. The calculation results show that optical band gap of AlxGa1-xN crystal is widened that the
ESTIMATING THE CONTENT OF SOIL CARBON BY USING NEAR-INFRARED SPECTRA
用近红外光谱预测土壤碳含量的研究

SHEN Zhang-Quan,WANG Ke,Xuewen HUANG,
沈掌泉
,王珂,Xuewen HUANG

红外与毫米波学报 , 2010,
Abstract: Partial least squares regression(PLSR) was employed to build predicting model of the content of soil carbon with on-the-go near-infrared reflectance spectroscopy(NIRS) measurements.The model based on band ratio or normalized difference of NIRS data can improve the prediction precision than the model with the original NIRS data.The reasons might be that the process of band arithmetic combination could reduce the risk of overfitting and it made the model include more useful components and information.The resu...
Structure and 57Fe conversion electron M ssbauer spectroscopy study of Mn-Zn ferrite nanocrystal thin films by electroless plating in aqueous solution
JianRong Sun,XueWen Wang,JinHong Liu,JianBo Wang,FaShen Li
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0045-7
Abstract: Mn1 x Zn x Fe2O4 thin films with various Zn contents and of different thickness were synthesized on glass substrates directly by electroless plating in aqueous solution at 90°C without heat treatment. The Mn-Zn ferrite films have a single spinel phase structure and well-crystallized columnar grains growing perpendicularly to the substrates. The results of conversion electron 57Fe M ssbauer spectroscopy (CEMS) indicate that the cation distribution of Mn1 x Zn x Fe2O4 ferrite nanocrystal thin films fabricated by electroless plating is different from the bulk materials’ and a great quantity of Fe3+ ions are still present on A sites for x>0.5. When the Zn content of the films increases, Fe3+ ions in the films transfer from A sites to B sites and the hyperfine magnetic field reduces, suggesting that Zn2+ has strong chemical affinity towards the A sites. On the other side, with the increase of the thickness of the films, Fe3+ ions, at B sites in the spinel structure, increase and the array of magnetic moments no longer lies in the thin film plane completely. At x = 0.5, H c and M s of Mn1 x Zn x Fe2O4 thin films show a minimum of 3.7 kA/m and a maximum of 419.6 kA/m, respectively.
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.
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.
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