DEAR EDITOR, The distribution of the capped langur （Trachypithecus pileatus） in China has become controversial since Shortridge＇s langur （Trachypithecus shortridgei） was upgraded to a full species. The capped lan...DEAR EDITOR, The distribution of the capped langur （Trachypithecus pileatus） in China has become controversial since Shortridge＇s langur （Trachypithecus shortridgei） was upgraded to a full species. The capped langur is considered to be distributed in northeast India, Bangladesh, Bhutan, and northwest Myanmar only （Brandon-Jones et al., 2004; Choudhury, 2008, 2014; Das et al., 2008; Groves, 2001）. In our field survey, however, we obtained photos of the capped langur, demonstrating its existence in China. Following the species promotion of Shortridge＇s langur （Brandon-Jones et al., 2004; Groves, 2001） and the delimiting of its distribution range to northwestern Yunnan in China and northeastern Myanmar （Brandon-Jones et al., 2004; Cui et al.,展开更多
Hydrothermal reactions of Na2MoO2·2H2O and NH4VO3（or V2O5） with appropriate reducing agents such as organic amines, NH2OH·HCl and Mo（CO）6 gave rise to the formation of a series of capped Keggin derivativ...Hydrothermal reactions of Na2MoO2·2H2O and NH4VO3（or V2O5） with appropriate reducing agents such as organic amines, NH2OH·HCl and Mo（CO）6 gave rise to the formation of a series of capped Keggin derivatives, [N（CH3）4]2Na3（NH4）2[（V^VO4）Mo^VI8V^IV4O36（V^IVO）2]·-13H2O（1）, [NH4]7[（V^VO4）Mo^VI8V^IV4O36（V^IVO）2]·7H2O（2）, [HN（CH2CH2）3NH][（PO4）Mo^V3Mo^VI9O36（V^IVO）2]·-3[N（CH2CH2）3N]·（en）·4.5H2O（3） and [HNH2OH][NH4]2[（V^VO4）Mo^VI8V^IV4O36（V^IVO）4]·24H2O（4）. Single-crystal X-ray diffraction analysis revealed that the anions in 1-3 are two-capped Keggin derivatives with characteristic trans vanadium-oxygen caps, whereas the heteropoly anion in 4 is a tetra-capped α-Keggin derivative with characteristic vanadium-oxygen caps on the equatorial plane.展开更多
Tin monosulphide(SnS) thin films capped by PVA have been successfully deposited on glass substrates for cost effective photovoltaic device applications by a simple and low-cost wet chemical process, chemical bath depo...Tin monosulphide(SnS) thin films capped by PVA have been successfully deposited on glass substrates for cost effective photovoltaic device applications by a simple and low-cost wet chemical process, chemical bath deposition(CBD) at different bath temperatures varying in the range, 50–80 °C. X–ray diffraction analysis showed that the deposited films were polycrystalline in nature, showing orthorhombic structure with an intense peak corresponding to(040) plane of SnS. These observations were further confirmed by Raman analysis. FTIR spectra showed the absorption bands which corresponds to PVA in addition to SnS.The scanning electron microscopy and atomic force microscopy studies revealed that the deposited SnS films were uniform and nanostructured with an average particle size of 4.9 to 7.6 nm. The optical investigations showed that the layers were highly absorbing with the optical absorption coefficient ～10~5 cm^(-1). A decrease in optical band gap from 1.92 to 1.55 eV with an increase of bath temperature was observed. The observed band gap values were higher than the bulk value of 1.3 eV, which might be due to quantum confinement effect. The optical band gap values were also used to calculate particle size and the results are discussed.展开更多
基金supported by the Second National Survey of Terrestrial Wildlife Resources of the State Forestry Administration of China(Semnopithecus schistaceus Project,No.176 Geographic Unit Project)the National Natural Science Foundation of China(31400361)+1 种基金the Science and Technology Planning Project of Guangdong Province,China(2013B061800042)the National Key Program(2016YFC0503200)from the Ministry of Science and Technology of China
文摘DEAR EDITOR, The distribution of the capped langur （Trachypithecus pileatus） in China has become controversial since Shortridge＇s langur （Trachypithecus shortridgei） was upgraded to a full species. The capped langur is considered to be distributed in northeast India, Bangladesh, Bhutan, and northwest Myanmar only （Brandon-Jones et al., 2004; Choudhury, 2008, 2014; Das et al., 2008; Groves, 2001）. In our field survey, however, we obtained photos of the capped langur, demonstrating its existence in China. Following the species promotion of Shortridge＇s langur （Brandon-Jones et al., 2004; Groves, 2001） and the delimiting of its distribution range to northwestern Yunnan in China and northeastern Myanmar （Brandon-Jones et al., 2004; Cui et al.,
基金Supported by the 973 key program of the MOST(2010CB933501,2012CB821705)the Chinese Academy of Sciences(KJCX2-YW-319,KJCX2-EW-H01)+1 种基金the National Natural Science Foundation of China(21373221,21221001,91022008,91122027,51172232)the Natural Science Foundation of Fujian Province(2011HZ0001-1,2012J06006,2006L2005)
文摘Hydrothermal reactions of Na2MoO2·2H2O and NH4VO3（or V2O5） with appropriate reducing agents such as organic amines, NH2OH·HCl and Mo（CO）6 gave rise to the formation of a series of capped Keggin derivatives, [N（CH3）4]2Na3（NH4）2[（V^VO4）Mo^VI8V^IV4O36（V^IVO）2]·-13H2O（1）, [NH4]7[（V^VO4）Mo^VI8V^IV4O36（V^IVO）2]·7H2O（2）, [HN（CH2CH2）3NH][（PO4）Mo^V3Mo^VI9O36（V^IVO）2]·-3[N（CH2CH2）3N]·（en）·4.5H2O（3） and [HNH2OH][NH4]2[（V^VO4）Mo^VI8V^IV4O36（V^IVO）4]·24H2O（4）. Single-crystal X-ray diffraction analysis revealed that the anions in 1-3 are two-capped Keggin derivatives with characteristic trans vanadium-oxygen caps, whereas the heteropoly anion in 4 is a tetra-capped α-Keggin derivative with characteristic vanadium-oxygen caps on the equatorial plane.
文摘Tin monosulphide(SnS) thin films capped by PVA have been successfully deposited on glass substrates for cost effective photovoltaic device applications by a simple and low-cost wet chemical process, chemical bath deposition(CBD) at different bath temperatures varying in the range, 50–80 °C. X–ray diffraction analysis showed that the deposited films were polycrystalline in nature, showing orthorhombic structure with an intense peak corresponding to(040) plane of SnS. These observations were further confirmed by Raman analysis. FTIR spectra showed the absorption bands which corresponds to PVA in addition to SnS.The scanning electron microscopy and atomic force microscopy studies revealed that the deposited SnS films were uniform and nanostructured with an average particle size of 4.9 to 7.6 nm. The optical investigations showed that the layers were highly absorbing with the optical absorption coefficient ～10~5 cm^(-1). A decrease in optical band gap from 1.92 to 1.55 eV with an increase of bath temperature was observed. The observed band gap values were higher than the bulk value of 1.3 eV, which might be due to quantum confinement effect. The optical band gap values were also used to calculate particle size and the results are discussed.
