Four new types of microporous beryllophosphates were hydrothermally synthesized using BeO - P_2O_5- R - MCl (or MCl_2) - H_20, R being HMDA (1, b-hexanediamine), EDA (ethylenediamine), or TBAOH (tetrabutytamine hydrox...Four new types of microporous beryllophosphates were hydrothermally synthesized using BeO - P_2O_5- R - MCl (or MCl_2) - H_20, R being HMDA (1, b-hexanediamine), EDA (ethylenediamine), or TBAOH (tetrabutytamine hydroxide), M alkali or alkali earth cation. By means of X-ray diffraction patterns (XRD), infrared (IR), TG-DT and elemental analyses we show that the crystalline beryllopbospbates have novel, unique framework structures, composed from basic units of tetrahedral P0_4 and Be0_4. These materials exhibit zeolite-like adsorption and ion-exchange properties.展开更多
Hybrid materials incorporating Eu-(TTA)3·2H20 (hereafter designated as Eu-TTA, with TTA: thenoyltrifluoroacetone) in unmodified or modified MCM-41 by 3-aminopropyl-triethoxysilane (APTES) were prepared by impregn...Hybrid materials incorporating Eu-(TTA)3·2H20 (hereafter designated as Eu-TTA, with TTA: thenoyltrifluoroacetone) in unmodified or modified MCM-41 by 3-aminopropyl-triethoxysilane (APTES) were prepared by impregnation method. The obtained materials were characterized using X-ray diffraction (XRD), IR and diffuse reflectance spectroscopy and luminescence spectra. All the hybrid samples exhibited the characteristic emission bands of Eu3+ under UV light exci-tation at room temperature, and the excitation spectra showed significant blue-shifts compared to the pure rare-earth complex. Although the red emission intensity in the modified hybrid was almost the half of the red emission intensity in the pure Eu-TTA complex at room temperature, the hybrid showed a much higher thermal stability due to the shielding character of the MCM-41 host.展开更多
Salmonella is a member of the family Enterobacteriaceae. This genus comprises two species, namely Salmonella enterica and Salmonella bongori. Salmonella enterica is further divided into six subspecies, namely enterica...Salmonella is a member of the family Enterobacteriaceae. This genus comprises two species, namely Salmonella enterica and Salmonella bongori. Salmonella enterica is further divided into six subspecies, namely enterica, salamae, arizonae,展开更多
A new maximal function is introduced in the dual spaces of test function spaces on spaces of homogeneous type. Using this maximal function, we get new characterization of atomic H^p spaces.
Low-Z materials, such as carbon-based materials and Be, are major plasma-facing material (PFM) for current, even in future fusion devices. In this paper, a new type of multielement-doped carbon-based materials develop...Low-Z materials, such as carbon-based materials and Be, are major plasma-facing material (PFM) for current, even in future fusion devices. In this paper, a new type of multielement-doped carbon-based materials developed are presented along with experimental re-sults of their properties. The results indicate a decrease in chemical sputtering yield by one order of magnitude, a decrease in both thermal shock resistance and radiation-enhanced sublimation, an evidently lower temperature desorption spectrum, and combined properties of exposing to plasma.展开更多
There are 93 groups of characters in the Chu bamboo slips of Mingxun that have different forms with traditional charac-ters used latter.The 93 groups of characters can be divided into 4 types.Among them Type 1,the int...There are 93 groups of characters in the Chu bamboo slips of Mingxun that have different forms with traditional charac-ters used latter.The 93 groups of characters can be divided into 4 types.Among them Type 1,the interchangeable characters,ac-count for 72.0%in total.The statistics reveal that it was so common to use different forms of characters during the Warring States period and this is a characteristic of the Chu bamboo slips.Besides,the statistics emphasize the importance of phonic sign in the character.展开更多
Restriction endonuclease analysis(REA),or restriction fragment length polymorphism(RFLP),was useful for identifying and determining the relatedness and putative identities of microbial strains(Tang et al.,1997)and for...Restriction endonuclease analysis(REA),or restriction fragment length polymorphism(RFLP),was useful for identifying and determining the relatedness and putative identities of microbial strains(Tang et al.,1997)and for characterizing and discriminating large numbers of samples inexpensively in the past。展开更多
文摘Four new types of microporous beryllophosphates were hydrothermally synthesized using BeO - P_2O_5- R - MCl (or MCl_2) - H_20, R being HMDA (1, b-hexanediamine), EDA (ethylenediamine), or TBAOH (tetrabutytamine hydroxide), M alkali or alkali earth cation. By means of X-ray diffraction patterns (XRD), infrared (IR), TG-DT and elemental analyses we show that the crystalline beryllopbospbates have novel, unique framework structures, composed from basic units of tetrahedral P0_4 and Be0_4. These materials exhibit zeolite-like adsorption and ion-exchange properties.
基金financial supportfrom PRAMX 98-05 and helpful discussion with Dr.A.C.Franville.
文摘Hybrid materials incorporating Eu-(TTA)3·2H20 (hereafter designated as Eu-TTA, with TTA: thenoyltrifluoroacetone) in unmodified or modified MCM-41 by 3-aminopropyl-triethoxysilane (APTES) were prepared by impregnation method. The obtained materials were characterized using X-ray diffraction (XRD), IR and diffuse reflectance spectroscopy and luminescence spectra. All the hybrid samples exhibited the characteristic emission bands of Eu3+ under UV light exci-tation at room temperature, and the excitation spectra showed significant blue-shifts compared to the pure rare-earth complex. Although the red emission intensity in the modified hybrid was almost the half of the red emission intensity in the pure Eu-TTA complex at room temperature, the hybrid showed a much higher thermal stability due to the shielding character of the MCM-41 host.
基金financially supported by the University of Malaya Research Grant (UMRG) (RP003A-13BIO)UM Postgraduate Research Fund (PPP) (PS319/2010B)
文摘Salmonella is a member of the family Enterobacteriaceae. This genus comprises two species, namely Salmonella enterica and Salmonella bongori. Salmonella enterica is further divided into six subspecies, namely enterica, salamae, arizonae,
文摘A new maximal function is introduced in the dual spaces of test function spaces on spaces of homogeneous type. Using this maximal function, we get new characterization of atomic H^p spaces.
基金The work was supported by the National Nature Science Foundation of China No.19789503.
文摘Low-Z materials, such as carbon-based materials and Be, are major plasma-facing material (PFM) for current, even in future fusion devices. In this paper, a new type of multielement-doped carbon-based materials developed are presented along with experimental re-sults of their properties. The results indicate a decrease in chemical sputtering yield by one order of magnitude, a decrease in both thermal shock resistance and radiation-enhanced sublimation, an evidently lower temperature desorption spectrum, and combined properties of exposing to plasma.
文摘There are 93 groups of characters in the Chu bamboo slips of Mingxun that have different forms with traditional charac-ters used latter.The 93 groups of characters can be divided into 4 types.Among them Type 1,the interchangeable characters,ac-count for 72.0%in total.The statistics reveal that it was so common to use different forms of characters during the Warring States period and this is a characteristic of the Chu bamboo slips.Besides,the statistics emphasize the importance of phonic sign in the character.
基金supported by the National Natural Science Foundation of China (31570155 and 31370199)"Young Top-notch Talents" of the Guangdong Province Special Support Program (2014)+3 种基金the Excellent Young Teacher Training Plan of Guangdong Province (Yq2013039)the Guangzhou Healthcare Collaborative Innovation Major Project (201400000002)funded by the China Scholarship Council (CSC No. 201508440056) as a Visiting Scholar (2015-2016)supported by a summer research grant to D.S. from the Office of the Vice President for Research at George Mason University
文摘Restriction endonuclease analysis(REA),or restriction fragment length polymorphism(RFLP),was useful for identifying and determining the relatedness and putative identities of microbial strains(Tang et al.,1997)and for characterizing and discriminating large numbers of samples inexpensively in the past。