相干光被粗糙表面散射后衍射谱的分布探讨

利用傅立叶光学的基本原理，对相干光波被粗糙表面散射后衍射谱的分布进行探讨。     

Simulation study on the gasification process of Ningdong coal with iron-based oxygen carrier

Chemical looping gasification (CLG) of Ningdong coal by using Fe₂O₃ as the oxygen carriers (OCs) was studied, and the gasification characteristics were obtained. A computation fluid dynamics (CFD) model based on Eulerian‐-Lagrangian multiphase framework was established, and a numerical simulation the coal chemical looping gasification processes in fuel reactor (FR) was investigated. In addition, the heterogeneous reactions, homogeneous reactions and Fe₂O₃ oxygen carriers' reduction reactions were considered in the gasification process. The characteristics of gas flow and gasification in the FR were analyzed and it was found that the experiment results were consistent with the simulation values. The results show that when the O/C mole rate was 0.5:1, the gasification temperature was 900 ℃ and the water vapor volume flow rate was 2.2 ml·min^-1, the mole fraction of syngas reached a maximum value of the experimental result and simulation value were 71.5% and 70.2%, respectively. When the O/C mole rate was 0.5:1, the gasification temperature was 900 ℃, and the water vapor volume flow was 1.8 ml·min^-1; the gasification efficiency reached the maximum value was 62.2%, and the maximum carbon conversion rate was 84.0%.     

Energy and economic analysis of a hydrogen and ammonia co-generation system based on double chemical looping

In this work, a model of hydrogen production by double chemical looping is introduced. The efficiency benefit obtained was investigated. The chemical looping hydrogen generation unit is connected in series to the downstream of a chemical looping gasification unit as an additional system for 100 MW·h coal gasification, with the function of supplementary combustion to produce hydrogen. Using Aspen Plus software for process simulation, the production of H_2 and N_2 in the series system is higher than that in the independent Chemical looping gasification and Chemical looping hydrogen generation systems, and the production of hydrogen is approximately 25.63% and 12.90% higher, respectively; The study found that when the gasification temperature is 900 °C, steam-carbon ratio is 0.84 and oxygen-carbon ratio is 1.5,the hydrogen production rate of the system was the maximum. At the same time, through heat exchange between logistics, high-pressure steam at 8.010×10~4 kg·h~(-1) and medium-pressure steam at 1.101×10~4 kg·h~(-1) are generated, and utility consumption is reduced by 61.58%, with utility costs decreasing by 48.69%. An economic estimation study found that the production cost of ammonia is 108.66 USD·(t NH_3)~(-1). Finally, cost of equipment is the main factors influencing ammonia production cost were proposed by sensitivity analysis.     

PFF与PUF热稳定性及燃烧性能研究

制备了酚醛泡沫和聚氨酯泡沫，并研究了酚醛硬泡与聚氨酯硬泡的热稳定性及燃烧性能。结果表明：和聚氨酯泡沫比较，酚醛泡沫的热失重小，热释放速率和热释放总量低。因此酚醛泡沫的热稳定性和阻燃性能明显优于聚氨酯泡沫。     

MgO／Ni系梯度功能材料的设计与制备

对ＭｇＯ／Ｎｉ系梯度功能材料（ＦＧＭ），分别用实验和微观力学模型测定和计算了用于热应力缓和设计的各物性参数。讨论了两种结果之间存在差异的原因。用有限元方法模拟了制备过程中ＦＧＭ的热应力，得到ＭｇＯ／Ｎｉ系ＦＧＭ的综合设计准则。按设计结果进一步调整粉末工艺性质，成功地烧制出ＭｇＯ／Ｎｉ系ＦＧＭ。     

纳米铁氧体复合材料制备及吸波性能研究

采用溶胶-凝胶与自蔓延燃烧相结合的方法制备出碳．纳米铁氧体复合材料，应用X射线衍射仪、扫描电镜分别对产物的晶体结构和微观形貌进行了表征分析，着重对比研究了超细碳材料加入前后的变化。利用小型烟箱试验测出产物在军用红外波段质量消光系数大于1．1m^2／g；利用矢量网络分析仪测试其在2～18GHz的电磁参数，并得到损耗角正切值随频率变化的曲线。结果表明：在纳米铁氧体中添加超细碳材料，铁氧体原有的磁损耗不变，介电损耗值有了显著提高，从而增加了电磁波的总损耗。由此证实超细碳-纳米铁氧体复合材料具有宽频吸波特性。     

Ba和Sm双原子填充Skutterudite化合物的制备及热电性能

以Ba和Sm作为填充原子，用熔融法结合放电等离子快速烧结（SPS）制备出了单相的Ba和Sm复合填充的Skutterudite化合物BamSmnFexCO4-xSb12,研究了两种原子复合填充总量及填充比例对其热电性能的影响规律。结果表明：随着Ba和Sm双原子复合填充总量的增加，P型BamSmnFexCo4-xSb12化合物的Seebeck系数增加、电导率和热导率降低。当复合填充总量相近时，Ba原子填充比例较大的Skutterudite化合物，其电性能稍好：而Sm原子填充比例较大的Skutterudite化合物，其热导率稍低。本研究中Ba0.218Sm0.204Fe1.51Co2.50Sb12化合物的最大热电性能指数ZTmax。值在800K时为0．75。     

MoS2/C纳米复合材料的合成及其电化学性能研究

理论比能量高达2 600 Wh/kg的锂硫电池已经成为锂电池研究热点,然而硫导电性不好、穿梭效应和锂化体积效应较大等问题阻碍了锂硫电池的产业化。将无定型多孔碳材料的高导电性和极性MoS₂的固硫作用相结合改善锂硫电池的电化学性能。所得的S@MoS₂/C在0.05 C和2 C电流密度下的放电比容量分别为1 507和406.3 mAh/g,比S@MoS₂在相同电流密度下的放电比容量（1 400和345.7 mAh/g）更高。在循环性能测试中,S@MoS₂/C容量保持率为46.9%,要高于S@MoS₂（39.1%）。因此,MoS₂/C复合材料作为硫载体可以显著改善锂硫电池性能。     

“车体-多边形化车轮-轨道”耦合系统动力分析及多边形车轮识别

列车车轮多边形是铁路车辆中最常见的一种车轮失圆形态。车轮多边形是车轮沿圆周方向出现不平顺的现象,能够引发轮轨冲击荷载,从而对轨道结构各部件产生严重影响。本文基于有限元法建立了“车体-多边形化车轮-轨道”耦合系统动力学有限元模型,研究了不同波深、车速和多边形阶数对轮轨力及轨道结构动力响应的影响。最后,将实测数据进行拟合,得到锯齿波函数,实现对多边形车轮的有效识别。