跳扩散对偶模型在带壁分红策略下的分红函数

考虑了带干扰的古典风险模型的对偶模型,讨论了模型在带壁分红策略下的一些结论．通过研究过程的局部时,证明了所讨论函数的边界条件．用在没有分红策略下模型的函数,给出了期望折现分红函数的显示表达．在最后一节,对于跳服从相位分布的情形,给出了数值例子,并讨论了最优分红边界的存在性．     

千特斯拉级内爆磁压缩装置初始磁场电源系统研制

初始磁场电源系统用于激励千特斯拉级内爆磁压缩装置的初级线圈产生初始磁场,是内爆磁压缩装置的关键设备。在分析千特斯拉级内爆磁压缩装置初始磁场电源需求和技术难点的基础上,系统设计了核心部件选择方案和主脉冲电路及控制系统结构,研制成功一套输出电压1～40 kV可调、主放电电流脉冲上升沿约60 μs、总峰值电流达3.2 MA的初始磁场电源系统,已应用于千特斯拉级内爆磁压缩装置动态试验。     

Rogue Wave Solutions for Nonlinear Schrödinger Equation with Variable Coefficients in Nonlinear Optical Systems

In this paper, the generalized Darboux transformation is constructed to variable coefficient nonlinear Schrödinger (NLS) equation. The N-th order rogue wave solution of this variable coefficient NLS equation is obtained by determinant expression form. In particular, we present rogue waves from first to third-order through some figures and analyze their dynamics.     

Determination of Acidity of Hydrocracking Catalyst Support

In hydrocracking, the most hinges are to develop a good quality catalyst, and the key is to prepare a high quality support. Generally speaking, the support of hydrocracking catalyst consists of Al₂O₃,SiO₂-Al₂O₃, zeolite and so on. The composition of the support can be changed or modified according to the acid property required by the reaction. Therefore, to study the acid amount and distribution of acid strength of each single component will give us insight into the development of to design a good support.     

MFI/BEA双沸石复合物的合成及其在甲烷选择性还原NOx中的应用

以合成的β沸石固液混合物作为ZSM-5沸石的部分原料制备了含有ZSM-5和β沸石的双相沸石复合物MFI/BEA。采用XRD, FTIR, 吡啶红外, NH₃-TPD, TEM, SEM和氮吸附-脱附等对合成的材料进行了表征。结果表明后合成的ZSM-5沸石在β沸石内部孕育生长, MFI/BEA双沸石复合物中两相沸石的组成比例可以通过控制第二步晶化时间来进行有效调控;与单一的Co-ZSM-5或Co-β相比, 通过离子交换法制备的Co-基复合催化剂Co-MFI/BEA在富氧条件下甲烷选择催化还原NO反应中具有高活性和高的稳定性, 并且表现出较好的抗SO₂毒化性能和良好的可逆性。     

共价有机框架材料在碘捕捉方面的研究进展

With the development of the nuclear industry, radioactive iodine was identified as one of the most hazardous nuclear wastes. Radioactive iodine capture also plays an important role in reducing the contamination of nuclear wastewater. Covalent organic frameworks (COFs), a crystalline porous organic material formed by covalent bond connection, are considered an ideal candidate for iodine capture materials for their large specific surface area, regular pore structure and high chemical stability. COFs are considered as ideal iodine trapping materials due to their structural characteristics and the fact that the adsorption sites of COFs are easily occupied by iodine molecules. This paper mainly reviews the progress of COFs with periodic porous structure and tunable functions in the field of iodine capture. Firstly, the recent progress in iodine capture of imine bonded COFs was briefly reviewed. Secondly, iodine capture capacity of compound COFs and ionic COFs are discussed. Finally, the potential of efficient iodine capture COFs to scale and the future development of this field. Contents 1 Introduction2 Capture of iodine by different types of COFs2.1 Imine bonded COFs2.2 Compound-functionalized COFs2.3 3D COFs2.4 Ionic-multivariated COFs3 Conclusion and outlook     

环氧树脂-胺类固化体系微结构的正电子湮没研究

采用正电子湮没寿命谱（PALS）研究固化剂的种类及含量对环氧树脂基体自由体积特性、力学性能和密度的影响.实验结果发现:固化剂的含量与理论值越接近,固化产物的自由体积半径越小,密度越高,力学性能越好.固化剂中的氨基对环氧基发生交联作用的程度,直接影响了固化产物的密度及力学性能.