Contour dynamics (CD) method for the motions of typhoon is presented in this paper. The effect of asymmetric inner structure on the typhoon'sanomalous track has been discussed in different environmental steering. ...Contour dynamics (CD) method for the motions of typhoon is presented in this paper. The effect of asymmetric inner structure on the typhoon'sanomalous track has been discussed in different environmental steering. Todemonstrate the feasibility of the method, the track of Typhoon Yancy(9012) isconcerned with. The numerical results show that the method can describe the tendency of looping qualitatively.展开更多
在强光照射下,CdS量子点易发生光腐蚀现象,通过金属掺杂和复合的方式可以提高CdS的光催化性能和光稳定性。采用水热法合成了Zn掺杂CdS/g-C_(3)N_(4)复合纳米材料(Zn-CdS/g-C_(3)N_(4))。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、...在强光照射下,CdS量子点易发生光腐蚀现象,通过金属掺杂和复合的方式可以提高CdS的光催化性能和光稳定性。采用水热法合成了Zn掺杂CdS/g-C_(3)N_(4)复合纳米材料(Zn-CdS/g-C_(3)N_(4))。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)和傅里叶变换红外光谱(FT-IR)等手段对Zn-CdS/g-C_(3)N_(4)复合材料的形貌、结构和组成等进行了表征。结果表明,Zn-CdS纳米颗粒附着在g-C_(3)N_(4)表面上,从而形成Zn-CdS/g-C_(3)N_(4)复合材料,且复合后材料带隙减小,光生电子-空穴复合率降低。在500 W Xe灯照射下,研究了Zn-CdS/g-C_(3)N_(4)对罗丹明B(RhB)的光催化降解性能。在最优条件下,光照40 min后,所制备的Zn-CdS/g-C_(3)N_(4)对RhB的光催化降解效率达99%。此外,所合成的Zn-CdS/g-C_(3)N_(4)复合材料光稳定性较高、可再生性好。这归因于Zn和Cd的协同作用以及与g-C_(3)N_(4)的复合,促进了光生载流子的分离和转移。展开更多
CdS thin films were deposited by the ion layer gas reaction (TLGAR) method.Structural, chemical, topographical development as well as optical and electrical properties ofas-deposited and annealed thin films were inves...CdS thin films were deposited by the ion layer gas reaction (TLGAR) method.Structural, chemical, topographical development as well as optical and electrical properties ofas-deposited and annealed thin films were investigated by XRD, SEM, XPS, AFM and UV-VIS. The resultsshowed that the thin films are uniform, compact and good in adhesion to the substrates, and thegrowth of the films is 2.8 nm/cycle. The evolution of structure undergoes from the cubic structureto the hexagonal one with a preferred orientation along the (002) plane after annealing at 673 K. Anamount of C, O and Cl impurities can be reduced by increasing the drying temperature or byannealing in N2 atmosphere. It was found that the band gap of the CdS films shifts to higherwavelength after annealing or increasing film thickness. The electrical resistivity decreases withincreasing annealing temperature and film thickness.展开更多
地质和环境样品中Cd同位素组成的准确、高精度分析对于研究海洋初级生产力、古环境变化、重金属Cd污染的溯源、硫化物矿床的成因和海洋Cd循环等领域具有重要意义.然而,环境和地质样品的低Cd含量和复杂基体给高精度Cd同位素分析带来挑战...地质和环境样品中Cd同位素组成的准确、高精度分析对于研究海洋初级生产力、古环境变化、重金属Cd污染的溯源、硫化物矿床的成因和海洋Cd循环等领域具有重要意义.然而,环境和地质样品的低Cd含量和复杂基体给高精度Cd同位素分析带来挑战.针对地质和环境样品,开发了一种高效可靠的两柱Cd色谱分离流程和高精度的Cd同位素测定方法.在第一柱AG-MP-1M阴离子交换树脂中,主要基体元素(包括≥99%的Sn)被优先去除,随后Cd及少量残余的Sn用4 mL 1 M HNO_(3)溶液快速洗脱.与传统第二柱分离Cd常用的TRU.Spec、UTEVA和BPHA萃取树脂不同,除了Mo、Sn、Zr等元素,TOPO树脂还能有效去除其他潜在残余基体元素(如Mg、Fe、Pb、Ti、V、Ag、Cu、Zn等),且避免了树脂来源有机质引入的问题.Cd同位素比值在Neptune Plus MC-CP-MS上测定,仪器的质量分馏采用Cd的双稀释剂法(111Cd-113Cd)校正.两个标准溶液(NIST SRM 3108和Spex Cd)长期测量值的外部精度优于0.05‰.采用优化的两柱Cd色谱分离流程处理地质和环境标准样品,其测定的Cd同位素值在误差范围内与文献报道值一致,证实了该方法准确可靠且高效实用.此外,首次报道了国内的地质标样GSR-2、GSR-3及土壤标样GSS-6a的Cd同位素组成,这些参考数据为不同实验室间Cd同位素分析能力的评估和数据质量控制提供了依据.综上,本研究为地质和环境样品的高精度Cd同位素分析建立了一种高效实用的可靠分析方法.展开更多
The titanium oxide （TiO2） nanotubes have attracted attention for their use in dye-sensitized solar cells as photoanode. In this study semiconducting cadmium sulfide （CdS） nanoparticles arc grown on top opened TiO2...The titanium oxide （TiO2） nanotubes have attracted attention for their use in dye-sensitized solar cells as photoanode. In this study semiconducting cadmium sulfide （CdS） nanoparticles arc grown on top opened TiO2 nanotubes arrays by radio-frequency magnetron sputtering. X-ray diffraction, scanning electron mieroscopy, transmission electron microscopy and diffuse reflection spectra are used to study structural, morphological and optical properties of the CdS/TiO2 bilayer.展开更多
文摘Contour dynamics (CD) method for the motions of typhoon is presented in this paper. The effect of asymmetric inner structure on the typhoon'sanomalous track has been discussed in different environmental steering. Todemonstrate the feasibility of the method, the track of Typhoon Yancy(9012) isconcerned with. The numerical results show that the method can describe the tendency of looping qualitatively.
文摘在强光照射下,CdS量子点易发生光腐蚀现象,通过金属掺杂和复合的方式可以提高CdS的光催化性能和光稳定性。采用水热法合成了Zn掺杂CdS/g-C_(3)N_(4)复合纳米材料(Zn-CdS/g-C_(3)N_(4))。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)和傅里叶变换红外光谱(FT-IR)等手段对Zn-CdS/g-C_(3)N_(4)复合材料的形貌、结构和组成等进行了表征。结果表明,Zn-CdS纳米颗粒附着在g-C_(3)N_(4)表面上,从而形成Zn-CdS/g-C_(3)N_(4)复合材料,且复合后材料带隙减小,光生电子-空穴复合率降低。在500 W Xe灯照射下,研究了Zn-CdS/g-C_(3)N_(4)对罗丹明B(RhB)的光催化降解性能。在最优条件下,光照40 min后,所制备的Zn-CdS/g-C_(3)N_(4)对RhB的光催化降解效率达99%。此外,所合成的Zn-CdS/g-C_(3)N_(4)复合材料光稳定性较高、可再生性好。这归因于Zn和Cd的协同作用以及与g-C_(3)N_(4)的复合,促进了光生载流子的分离和转移。
文摘CdS thin films were deposited by the ion layer gas reaction (TLGAR) method.Structural, chemical, topographical development as well as optical and electrical properties ofas-deposited and annealed thin films were investigated by XRD, SEM, XPS, AFM and UV-VIS. The resultsshowed that the thin films are uniform, compact and good in adhesion to the substrates, and thegrowth of the films is 2.8 nm/cycle. The evolution of structure undergoes from the cubic structureto the hexagonal one with a preferred orientation along the (002) plane after annealing at 673 K. Anamount of C, O and Cl impurities can be reduced by increasing the drying temperature or byannealing in N2 atmosphere. It was found that the band gap of the CdS films shifts to higherwavelength after annealing or increasing film thickness. The electrical resistivity decreases withincreasing annealing temperature and film thickness.
文摘地质和环境样品中Cd同位素组成的准确、高精度分析对于研究海洋初级生产力、古环境变化、重金属Cd污染的溯源、硫化物矿床的成因和海洋Cd循环等领域具有重要意义.然而,环境和地质样品的低Cd含量和复杂基体给高精度Cd同位素分析带来挑战.针对地质和环境样品,开发了一种高效可靠的两柱Cd色谱分离流程和高精度的Cd同位素测定方法.在第一柱AG-MP-1M阴离子交换树脂中,主要基体元素(包括≥99%的Sn)被优先去除,随后Cd及少量残余的Sn用4 mL 1 M HNO_(3)溶液快速洗脱.与传统第二柱分离Cd常用的TRU.Spec、UTEVA和BPHA萃取树脂不同,除了Mo、Sn、Zr等元素,TOPO树脂还能有效去除其他潜在残余基体元素(如Mg、Fe、Pb、Ti、V、Ag、Cu、Zn等),且避免了树脂来源有机质引入的问题.Cd同位素比值在Neptune Plus MC-CP-MS上测定,仪器的质量分馏采用Cd的双稀释剂法(111Cd-113Cd)校正.两个标准溶液(NIST SRM 3108和Spex Cd)长期测量值的外部精度优于0.05‰.采用优化的两柱Cd色谱分离流程处理地质和环境标准样品,其测定的Cd同位素值在误差范围内与文献报道值一致,证实了该方法准确可靠且高效实用.此外,首次报道了国内的地质标样GSR-2、GSR-3及土壤标样GSS-6a的Cd同位素组成,这些参考数据为不同实验室间Cd同位素分析能力的评估和数据质量控制提供了依据.综上,本研究为地质和环境样品的高精度Cd同位素分析建立了一种高效实用的可靠分析方法.
文摘The titanium oxide （TiO2） nanotubes have attracted attention for their use in dye-sensitized solar cells as photoanode. In this study semiconducting cadmium sulfide （CdS） nanoparticles arc grown on top opened TiO2 nanotubes arrays by radio-frequency magnetron sputtering. X-ray diffraction, scanning electron mieroscopy, transmission electron microscopy and diffuse reflection spectra are used to study structural, morphological and optical properties of the CdS/TiO2 bilayer.
