摘要：基于Matlab/simulink程序,针对小型直接布雷顿循环反应堆系统,通过模块化思想建立该系统数学物理模型,开发了系统分析程序。通过改变反应堆、透平、压缩机、换热器等关键设备的运行参数或引入阶跃扰动,模拟了系统稳态工况与瞬态变工况运行,得到了关键设备功率、进出口压力、温度等关键参数的变化曲线。结果表明,系统分析程序对小型直接布雷顿循环反应堆系统稳态与瞬态运行特性的模拟结果较合理,能为小型直接布雷顿循环反应堆系统的设计、优化与安全分析提供依据。

摘要：Sintering inhibition of a catalyst at high temperatures is a challenge during heterogeneous catalysis. In this paper, we report that hexagonal boron nitride(h-BN) is an optimal material for anti-sintering γ-Al_(2)O_(3)-supported Pt nanoparticles(NPs) originating from the high thermal conductivity of h-BN. The high thermal conductivity of h-BN ensures maximal heat dissipation from Pt NPs to γ-Al_(2)O_(3),thereby causing both Ostwald ripening and particle coalescence of Pt NPs to be decelerated at elevated *** of Pt NP sintering is also shown in the reducible TiO^(2-)supported Pt NPs with the help of h-BN. The proposed anti-sintering strategy using thermal management is universal, providing new insight into the design of anti-sintering materials and structures for a wide range of applications in heterogeneous catalysis.

摘要：Aimed at the guidance requirements of some missiles which attack targets with terminal impact angle at the terminal point,a new integrated guidance and control design scheme based on variable structure control approach for missile with terminal impact angle constraint is ***,a mathematical model of an integrated guidance and control model in pitch plane is established,and then nonlinear transformation is employed to transform the mathematical model into a standard form suitable for sliding mode control method design.A sufficient condition for the existence of linear sliding surface is given in terms of linear matrix inequalities（LMIs）,based on which the corresponding reaching motion controller is also *** verify the effectiveness of the proposed integrated design scheme,the numerical simulation of missile is *** simulation results demonstrate that the proposed guidance and control law can guide missile to hit the target with desired impact angle and desired flight attitude angle simultaneously.

摘要：针对多源、多时相卫星图像所构成的“广义立体模型”定位精度难以预估的实际难题,该文提出了一种通用的基于RFM(有理函数模型)的预估计算方法。首先,介绍定位精度重要指标基高比与立体交会角的关系,然后基于RFM模型通过投影轨迹法建立同名光线在物方空间的直线方程,计算出同名光线的立体交会角,进而实现定位精度的预估。利用实际工程卫星图像资料进行了试验,验证了该文方法的有效性。

摘要：本文针对多源SAR遥感影像联合定位的实际问题,将有理函数模型引入到SAR影像联合定位中,构建了基于有理函数模型的多源SAR区域网平差模型。对覆盖我国某地区的3景不同源SAR影像进行试验,验证了本文方法的有效性,并表明在缺少地面控制情况下,该方法不失为一种有益的补充方案。

摘要：碳化硅复合陶瓷泵是应用型国内首创全新技术产品,包括材料、生产工艺装备及产品设计的创新,是一种可以输送极端耐磨、耐腐固液混合介质的离心泵装置,其过流部件(叶轮、护板、泵体)均为陶瓷材质SiCEP制作,其他部件与传统材质一致。广泛应用于FGD脱硫、脱硫废水及化工等领域,有效推进了国内先进输送流程工艺(脱硫废水零排放工艺、多晶硅尾气处理工艺等)技术的实施。碳化硅复合陶瓷材料在离心泵上的成功应用,打破了国外企业的垄断地位,解决了相关国内工艺设备卡脖子的技术难题,填补了国内相关空白,提高了我国高端设备在全球市场的竞争地位。

摘要：Electrochemical reduction from nitrate into ammonia is a chance for nitrate removal from drinking water,while at higher concentrations,this 8-electron reduction process could even become relevant for energy storage,high conversions and low onset potentials ***,we report the synthesis and analysis of a NiFe_(2)O_(4)/C-MS hybrid system made by a molten-salt strategy where the Ni-Fe oxide spinel nanoparticles act as the active center for electrochemical nitrate(NO_(3)−)reduction reaction,while the microporous carbon serves as a conductive support to form a cohesive electrode *** NiFe_(2)O_(4)/C-MS catalyst achieves a maximum NH3 yield rate of 5.4 mg mgcat.^(−1)h^(−1)and Faradaic efficiency of 98%at−0.6 V versus reversible hydrogen *** NiFe_(2)O_(4)nanoparticles buried into microporous carbon,the onset potential decreases *** propose that this reduction originates from charge redistribution in NiFe_(2)O_(4)in the electronic heterojunction with carbon,while enhanced electrolyte diffusion in microporous carbon facilitates high conversion *** functional theory calculations clarify the low energy barrier on NiFe_(2)O_(4),highlighting the essential role of Ni in activating Fe *** COMSOL Multiphysics simulations demonstrate that the microporous curled carbon accelerates NO_(3)−transport and enhances adsorption on the reactive *** work offers insights for designing carbon-based nanocomposites for efficient nitrate reduction electrocatalysis.

摘要：本文针对多个条带WorldView卫星图像,研究了基于有理函数模型的附加参数区域网平差方法,对高分辨率卫星图像定位精度进行了详细分析。青海地区WorldView卫星图像试验结果表明:无地面控制点时,多条带整体区域网定位结果优于各个条带单独平差结果,区域网平差方法结果优于直接前方交会方法;有地面控制点时,多条带区域网平差结果与各个条带单独平差结果相当,且沿路线不大于10km布设一个地面控制点,其精度可满足1∶2000比例尺加密精度要求,可用于公路初步设计。

摘要：满族说部是满族先民在漫长的历史长河中积淀和孕育出来的古朴而悠久的民间长篇说唱形式,是中国满族及其女真先民中传袭的古老的民间口承艺术。其讲述的主要内容为英雄的故事,而这些英雄故事,都离不开神祇降生和英雄成长这两个母题。观照满族说部的叙事模式,不难发现这些母题都是满族先民世代传承的自强不息、骁勇坚毅的民族精神的体现。

摘要：为实现航空橡塑密封结构的适航要求与产品研制过程融合,支持密封结构的适航性设计,提出密封结构适航领域知识模型构建方法。首先从CCAR条款、咨询通告、工业标准提取了面向全生命周期的密封结构适航要求,分析航空密封结构适航领域知识组成及关系;然后基于民机及系统研制系统工程,建立密封结构的适航性设计过程;在此基础上,定义了密封结构适航领域知识模型框架,利用“七步法+protégé”构建了密封结构的适航领域知识模型。实例证明该方法能支持密封结构适航审定基础快速生成,有效支持产品的适航性设计。