Using series iteration techniques identities and apply each of these identities in we derive a number of general double series order to deduce several hypergeometric reduction formulas involving the Srivastava-Daoust ...Using series iteration techniques identities and apply each of these identities in we derive a number of general double series order to deduce several hypergeometric reduction formulas involving the Srivastava-Daoust double hypergeometric function. The results presented in this article are based essentially upon the hypergeometric summation theorems of Kummer and Dixon.展开更多
In the field of economy, there are more and more electronic scanning cash images, which need to be compressed in a higher compression ratio. This paper proposes a specific compression algorithm for cash images. First,...In the field of economy, there are more and more electronic scanning cash images, which need to be compressed in a higher compression ratio. This paper proposes a specific compression algorithm for cash images. First, according to cash image characteristics and standard JPEG （joint photographic experts group） compression, image re-ordering techniques are analyzed, and the method of modifying some blocks into single color blocks is adopted. Then, a suitable quantization table for cash images is obtained. Experimental results show that the method is effective.展开更多
Adsorption is one of the most effective technologies in the treatment of colored matter containing wastewater. Graphene related composites display potential to be an effective adsorbent. However, the adsorption mechan...Adsorption is one of the most effective technologies in the treatment of colored matter containing wastewater. Graphene related composites display potential to be an effective adsorbent. However, the adsorption mechanism and their regeneration approach are still demanding more efforts. An effective magnetically separable absorbent, Fe3O4 and reduced graphene oxide(RGO) composite has been prepared by an in situ coprecipitation and reduction method. According to the characterizations of TEM, XRD, XPS, Raman spectra and BET analyses, Fe3O4 nanoparticles in sizes of 10-20 nm are well dispersed over the RGO nanosheets, resulting in a highest specific area of 296.2 m2/g. The rhodamine B adsorption mechanism on the composites was investigated by the adsorption kinetics and isotherms. The isotherms are fitting better by Langmuir model, and the adsorption kinetic rates depend much on the chemical components of RGO. Compared to active carbon, the composite shows 3.7 times higher adsorption capacity and thirty times faster adsorption rates. Furthermore,with Fe3O4 nanoparticles as the in situ catalysts, the adsorption performance of composites can be restored by carrying out a Fenton-like reaction, which could be a promising regeneration way for the adsorbents in the organic pollutant removal of wastewater.展开更多
The influence of the RE-rich phase distribution in the precursor alloys on the anisotropy of the hydrogenation disproportionation desorption recombination（HDDR） processed powders is investigated. The homogenized ing...The influence of the RE-rich phase distribution in the precursor alloys on the anisotropy of the hydrogenation disproportionation desorption recombination（HDDR） processed powders is investigated. The homogenized ingot alloy and the as-cast strip casting（SC） alloy with a uniform RE-rich grain boundary phase lead to high anisotropy of the refined powders,acquiring degrees of alignment（DOA） of 0.62 and 0.54, respectively. The RE-rich phase aggregation results in a deteriorated DOA of the powders due to the drastic disproportionation rate, while a thin and uniform RE-rich phase distribution is beneficial for DOA. A reaction model of the initial particle microstructure is proposed for optimizing the HDDR powder anisotropy.展开更多
人参皂苷Re是人参的主要药理活性成分,具有抑制癌细胞增长、阻止癌细胞转移及保护神经等重要生理作用,稀有人参皂苷Rh1在抗癌方面的疗效更为显著。为获得较高含量的Rh1,微生物转化是目前较为有效途径。该研究从人参种植土中筛选可转化...人参皂苷Re是人参的主要药理活性成分,具有抑制癌细胞增长、阻止癌细胞转移及保护神经等重要生理作用,稀有人参皂苷Rh1在抗癌方面的疗效更为显著。为获得较高含量的Rh1,微生物转化是目前较为有效途径。该研究从人参种植土中筛选可转化常量人参皂苷Re为稀有人参皂苷Rh1的目的菌株S329,以西洋参提取物为反应底物进行微生物发酵实验,利用高效液相色谱(HPLC)法对人参皂苷Re及其发酵产物进行分析。结果表明,通过对菌株形态学观察和18S r DNA测序分析,且通过在NCBI数据库上的Blast比对分析,鉴定高效菌株S329属于溜曲霉(Aspergillus tamarii),人参皂苷Re转化人参皂苷Rh1的转化率为27.65%。展开更多
文摘Using series iteration techniques identities and apply each of these identities in we derive a number of general double series order to deduce several hypergeometric reduction formulas involving the Srivastava-Daoust double hypergeometric function. The results presented in this article are based essentially upon the hypergeometric summation theorems of Kummer and Dixon.
基金supported by the National Natural Science Foundation of China under Grant No. 60703087the Project of Science and Technology Department of Zhejiang Province under Grant No. 2010C31006 and No. 2011C21081
文摘In the field of economy, there are more and more electronic scanning cash images, which need to be compressed in a higher compression ratio. This paper proposes a specific compression algorithm for cash images. First, according to cash image characteristics and standard JPEG （joint photographic experts group） compression, image re-ordering techniques are analyzed, and the method of modifying some blocks into single color blocks is adopted. Then, a suitable quantization table for cash images is obtained. Experimental results show that the method is effective.
基金financially supported by National Natural Science Foundation of China (No. 21377084)Shanghai Municipal Natural Science Foundation (No. 13ZR1421000)
文摘Adsorption is one of the most effective technologies in the treatment of colored matter containing wastewater. Graphene related composites display potential to be an effective adsorbent. However, the adsorption mechanism and their regeneration approach are still demanding more efforts. An effective magnetically separable absorbent, Fe3O4 and reduced graphene oxide(RGO) composite has been prepared by an in situ coprecipitation and reduction method. According to the characterizations of TEM, XRD, XPS, Raman spectra and BET analyses, Fe3O4 nanoparticles in sizes of 10-20 nm are well dispersed over the RGO nanosheets, resulting in a highest specific area of 296.2 m2/g. The rhodamine B adsorption mechanism on the composites was investigated by the adsorption kinetics and isotherms. The isotherms are fitting better by Langmuir model, and the adsorption kinetic rates depend much on the chemical components of RGO. Compared to active carbon, the composite shows 3.7 times higher adsorption capacity and thirty times faster adsorption rates. Furthermore,with Fe3O4 nanoparticles as the in situ catalysts, the adsorption performance of composites can be restored by carrying out a Fenton-like reaction, which could be a promising regeneration way for the adsorbents in the organic pollutant removal of wastewater.
基金Project supported by the National Natural Science Foundation of China(Grant No.51101167)the Ningbo Natural Science Foundation,China(Grant No.2013A610075)+4 种基金the Ningbo Science and Technology Project,China(Grant No.2013B10004)the Program of International Science and Technology Cooperation of China(Grant No.2010DFB53770)the China Postdoctoral Science Foundation(Grant No.2012M520943)the State Key Program of the National Natural Science Foundation of China(Grant No.2011AA03A401)the National Key Technologies R&D Program of China(Grant No.2012BAE01B03)
文摘The influence of the RE-rich phase distribution in the precursor alloys on the anisotropy of the hydrogenation disproportionation desorption recombination（HDDR） processed powders is investigated. The homogenized ingot alloy and the as-cast strip casting（SC） alloy with a uniform RE-rich grain boundary phase lead to high anisotropy of the refined powders,acquiring degrees of alignment（DOA） of 0.62 and 0.54, respectively. The RE-rich phase aggregation results in a deteriorated DOA of the powders due to the drastic disproportionation rate, while a thin and uniform RE-rich phase distribution is beneficial for DOA. A reaction model of the initial particle microstructure is proposed for optimizing the HDDR powder anisotropy.
文摘人参皂苷Re是人参的主要药理活性成分,具有抑制癌细胞增长、阻止癌细胞转移及保护神经等重要生理作用,稀有人参皂苷Rh1在抗癌方面的疗效更为显著。为获得较高含量的Rh1,微生物转化是目前较为有效途径。该研究从人参种植土中筛选可转化常量人参皂苷Re为稀有人参皂苷Rh1的目的菌株S329,以西洋参提取物为反应底物进行微生物发酵实验,利用高效液相色谱(HPLC)法对人参皂苷Re及其发酵产物进行分析。结果表明,通过对菌株形态学观察和18S r DNA测序分析,且通过在NCBI数据库上的Blast比对分析,鉴定高效菌株S329属于溜曲霉(Aspergillus tamarii),人参皂苷Re转化人参皂苷Rh1的转化率为27.65%。
