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| 1 | Evolution of windblown sand flux and dune field——Trans-scale modeling and simulation显示文摘Windblown sand flux and dune field evolving toward the oasis have been a common ecological and environmental threat confronted by many countries.Meanwhile,it is also a kind of complex dynamical process involving multiple temporal and spatial scales which is still out of accurate description through current field observations.Available models and reliable quantitative simulations are of significant value to predict the spreading rate of desertification and provide an optimal design for sand prevention.This paper presents a 'triple-jump' method to realize quantitative simulations to the formation and evolution of an aeolian dune field from an arbitrary initial configuration.Simulated results achieve a satisfactory agreement with observations qualitatively and quantitatively,which also reveal the characteristics and dynamical behaviors of dunes and dune field.Such a paradigm is of a good level of generality,which provides an exploratory probe into the subject of multi-scale physics. | Xiaojing Zheng a) Key Laboratory of Mechanics on Western Disaster & Environment,Ministry of Education,Lanzhou 730000,China | 2011 | Theoretical & Applied Mechanics Letters2011，1，4： | 1 |
| 2 | Solid-state synthesis of LnOCl/Ln_2O_3(Ln=Eu, Nd) by using chitosan and PS-co-P4VP as polymeric supports显示文摘A series of lanthanide materials of type LnOCl or Ln_2 O_3(Ln = Eu, Nd) were successfully prepared via a convenient and straightforward two-step procedure. Firstly, and by using chitosan and PS-co-P4 VP as polymeric supports, macromolecular complexes of type chitosan ·LnCl_3 and PS-co-P4 VP·LnCl3 were prepared. These macro molecular complexes were treated in solid state at 800 ℃ under air, leading to the corresponding LnOCl or Ln_2 O_3 materials(Ln = Eu, Nd) with moderate to good yields. The nature of the asprepared lanthanide materials(LnOCl and/or Ln_2 O_3) is strongly influenced by the polymeric template(i.e.,chitosan or PS-co-P4 VP), the lanthanide salt precursor, and the polymer/lanthanide molar ratio. Thus, when chitosan · EuCl_3 and PS-co-P4 VP·EuCl_3 are used as macromolecular precursors, a mixture of crystalline phases of both EuOCl and Eu_2 O_3 are obtained. However, when chitosan· NdCl_3 and PS-co-P4 VP· NdCl_3 are used, a sole pure crystalline phase of NdOCl is obtained. The nano structured lanthanide materials were characterized by means of XRD(X-ray diffraction of powder), SEM, EDS, TEM, and HRTEM. The luminescent spectra of the asprepared EuOCI/Eu_2 O_3 mixture materials show an emission pattern whose intensity is strongly influenced by the nature of the polymeric precursor, as well as on the metal/polymer molar ratios. | C.Diaz D.Carrillo R.de la Campa A.Presa Soto M.L.Valenzuela | 2018 | Journal of Rare Earths2018，36，12： | 0 |
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