The Study on the Evaluation of Universities’ Network Teaching Platforms’ Quality in Jiangxi Province

In recent years, network teaching platform has been more and more popular. First, this article describes the development of domestic and international network teaching platform. Second, the development of network teaching platform in Jiangxi province is introduced. Third, the literatures on the evaluation of web sites’ quality are reviewed. Finally, the quantitative evaluation system is proposed based on the quality evaluation method (QEM) of web sites. The system includes five indices. They are speed, navigability, teaching information, teacher and faculty information, help information. Network teaching platform of major universities are evaluated using these indices. These indices have important value to enhance the quality of network teaching platforms

Temporal variability in early afterglows of short gamma-ray bursts

The shock model has successfully explained the observed behaviors of afterglows from long gamma-ray bursts (GRBs). Here we use it to investigate the so-called early afterglows from short GRBs, which arises from blast waves that are not decelerated considerably by their surrounding medium. We consider a nearby medium loaded with $e^{\pm}$ pairs (Beloborodov 2002). The temporal behaviors show first a soft-to-hard spectral evolution, from the optical to hard X-ray, and then a usual hard-to-soft evolution after the blast waves begin to decelerate. The light curves show variability, and consist of two peaks. The first peak, due to the pair effect, can be observed in the X-ray, though too faint and too short in the optical. The second peak will be easily detected by {\it Swift}. We show that detections of the double-peak structure in the light curves of early afterglows are very helpful to determine all the shock parameters of short GRBs, including both the parameters of the relativistic source and the surroundings. Besides, from the requirement that the forward-shock emission in short GRBs should be below the BATSE detection threshold, we give a strong constraint on the shock model parameters. In particular, the initial Lorentz factor of the source is limited to be no more than $\sim 10^3$, and the ambient medium density is inferred to be low, n\la 10^{-1} cm$^{-3}$.Comment: 5 pages, 1 figure, minor changes to match the publish in MNRA

The Impacting Factors of College Students’ Willingness to Use the Online Education- an Example of Jiujiang University

Online education has many advantages, but many college students have never used the online education.Therefore, it is necessary to study the impacting factors of willingness to use the online education. In this paper, samples are collected in full-time college students of Jiujiang University.The theory of planned behavior is expanded by introducing perceived usefulness and perceived ease of use.The model of willingness to use the online education is established.Reliability analysis,validity analysis, confirmatory factor analysis and structural equation model testing are conducted by Amos20.0 and Spss17.0. The results show that: firstly,perceived usefulness and perceived ease of use of online education have a significantly positive effects on attitude;secondly,attitude, subjective norm, perceived behavioral control have a significantly positive impact on willingness to use the online education

The Study on the Influence about Trust to Online Shopping Behavior

This paper is based on theory of reasoned behavior and trust.Factors which influence the online shopping are studied. This research establishs the trust model of online shopping. Trust is analysed and stressed.The model is verified by SPSS16.0 and LISREL8.7 .Finally,this paper puts forward the measures about promoting trust to facilitate online shopping

The Study on Affecting Factors of Learners’ Satisfaction of Online Course Platform

Online course platforms have many advantages.Many universities establish online course platforms for online courses.Students\u27 satisfaction with the online course platform largely determine the adopt of online course platform. In this paper, students in JiuJiang University Jiangxi province are regarded as research objects. Moderating variables are Big Five personality traits.Dependent variables are reliability, navigation,richness, friendliness and aesthetics. Independent variable is satisfaction.A learners’ satisfaction model of online course platform is established. The collected 368 valid questionnaires are processed by Amos20.0 and spss17.0.The reliability and validity of questionnaires is reasonably. Confirmatory factor analysis is conducted. The hypotheses of structural equation model is also confirmed.The moderating effect of personality traits is partly verified by using grouping regression and hierarchical regression. The results shows that: firstly, the reliability, navigation, richness, friendliness and aesthetics of the online course platform are significantly positively related to satisfaction; secondly, apart from conscientiousness grouping,the remaining four personality traits have some moderating effect on the relationship between satisfaction and reliability, navigation, richness, friendliness, aesthetics of online course platform. Finally, the article makes a conclusion and proposes suggestions, limitations and directions of future research

The Study on Factors Influencing Personal Internet Banking Customers’ Loyalty

Customers’ Loyalty is important to internet banking. Customers’ Loyalty is not only involved in the survival of internet banking,but also the revenue of intenet banking.This paper studies the factors influencing personal internet banking customers’ loyalty. The model of loyalty of internet banking is constructed on the basis of theoretical research and china’s reality. And the model is tested by LISREL8.7 and SPSS17.0

TiO2 Nanocrystals Grown on Graphene as Advanced Photocatalytic Hybrid Materials

Graphene/TiO2 nanocrystals hybrid is successfully prepared by directly growing TiO2 nanocrystals on graphene oxide (GO) sheets. The direct growth of nanocrystals on GO sheets was achieved by a two-step method, in which TiO2 was coated on GO sheets by hydrolysis first and crystallized into anatase nanocrystals by hydrothermal treatment in second step. Slow hydrolysis reaction through the use of EtOH/H2O mixed solvents and addition of H2SO4 allows the selectively growing TiO2 on GO and suppressing free growth in solution. The method offers easy access to the GO/TiO2 nanocrystals hybrid with well controlled coating and strong interactions between TiO2 and the underlying GO sheets. The strong coupling could lead to advanced hybrid materials for various applications including photocatalysis. The prepared graphene/TiO2 nanocrystals hybrid has demonstrated superior photocatalytic activity in degradation of rhodamine B over other TiO2 materials, showing an impressive 3-fold photocatalytic enhancement over P25. It is expected that the hybrid material could also be promising for various other applications including lithium ion battery where strong electrical coupling to TiO2 nanoparticles is essential.Comment: Nano Research, in pres

Evaluation of SMOS soil moisture retrievals over the central United States for hydro-meteorological application

Soil moisture has been widely recognized as a key variable in hydro-meteorological processes and plays an important role in hydrological modelling. Remote sensing techniques have improved the availability of soil moisture data, however, most previous studies have only focused on the evaluation of retrieved data against point-based observations using only one overpass (i.e., the ascending orbit). Recently, the global Level-3 soil moisture dataset generated from Soil Moisture and Ocean Salinity (SMOS) observations was released by the Barcelona Expert Center. To address the aforementioned issues, this study is particularly focused on a basin scale evaluation in which the soil moisture deficit is derived from a three-layer Xinanjiang model used as a hydrological benchmark for all comparisons. In addition, both ascending and descending overpasses were analyzed for a more comprehensive comparison. It was interesting to find that the SMOS soil moisture accuracy did not improve with time as we would have expected. Furthermore, none of the overpasses provided reliable soil moisture estimates during the frozen season, especially for the ascending orbit. When frozen periods were removed, both overpasses showed significant improvements (i.e., the correlations increased from r = −0.53 to r = −0.65 and from r = −0.62 to r = −0.70 for the ascending and descending overpasses, respectively). In addition, it was noted that the SMOS retrievals from the descending overpass consistently were approximately 11.7% wetter than the ascending retrievals by volume. The overall assessment demonstrated that the descending orbit outperformed the ascending orbit, which was unexpected and enriched our knowledge in this area. Finally, the potential reasons were discussed

Jet-cloud/star interaction as an interpretation of neutrino outburst from the blazar TXS 0506+056

Recently, a high-energy neutrino event IceCube-170922A in the spatial and temporal coincidence with the flaring gamma-ray blazar TXS 0506+056 was reported. A neutrino outburst between September 2014 and March 2015 was discovered in the same direction by a further investigation of $9.5$ years of IceCube data, while the blazar is in a quiescent state during the outburst with a gamma-ray flux only about one-fifth of the neutrino flux. In this letter, we propose the neutrino outburst originates from the interaction between a relativistic jet and a dense gas cloud which may be formed via the tidally disrupted envelope of a red giant being blown by the impact of the jet. Gamma-ray photons and electron/positron pairs that are produced correspondingly will induce electromagnetic cascades. Comptonization of the cascade emission inside the cloud forms an X-ray photon field with Wien distribution. GeV flux is suppressed due to the absorption by the Comptonized photon field and, as a result, a hard spectrum above 10 GeV is formed. The gamma-ray spectrum predicted in our model is consistent with the Fermi-LAT data of TXS 0506+056.Comment: 6 pages, 3 figure

Pair loading in Gamma-Ray Burst Fireball And Prompt Emission From Pair-Rich Reverse Shock

Gamma-ray bursts (GRBs) are believed to originate from ultra-relativistic winds/fireballs to avoid the "compactness problem". However, the most energetic photons in GRBs may still suffer from $\gamma-\gamma$ absorption leading to electron/positron pair production in the winds/fireballs. We show here that in a wide range of model parameters, the resulting pairs may dominate those electrons associated with baryons. Later on, the pairs would be carried into a reverse shock so that a shocked pair-rich fireball may produce a strong flash at lower frequencies, i.e. in the IR band, in contrast with optical/UV emission from a pair-poor fireball. The IR emission would show a 5/2 spectral index due to strong self-absorption. Rapid responses to GRB triggers in the IR band would detect such strong flashes. The future detections of many IR flashes will infer that the rarity of prompt optical/UV emissions is in fact due to dust obscuration in the star formation regions.Comment: 8 pages, 2 figures, ApJ accepte