摘要：Because of their boundary-free and long-rangedisordered microstructure,Fe-based metallic glasses(MGs)exhibit an ultra-low pinning effect on the magnetic domain and unparalleled soft-magnetic properties[1-3],and thus are increasingly used in electric devices for the energy-saving and high-efficiency requirements[4,5].

摘要：针对海洋机动目标任务规划难、搜索难度大的特点,设计了一种面向海洋热点区域机动目标搜索监视的卫星组网星座。首先,根据机动目标搜索任务的特点,建立考虑时空约束条件的卫星成像条带拼接搜索策略;其次,根据机动目标搜索策略,设计了一种高时间分辨率组网星座构型;最后,构建以最小组网卫星侧摆角度和任务观测时间为优化目标的鲁棒模型,采用遗传算法对组网卫星进行优化求解,并给出算法实现流程。仿真结果表明,该卫星组网星座能够有效完成对目标区域机动目标覆盖监视,为热点区域海洋机动目标监视任务提供了一定的方法支撑。

摘要：目前对地球同步轨道(GEO)空间目标的探测和识别,主要依赖光学监视系统接收其反射的太阳光线.鉴于可见光反射原理,和空间目标可见光反射特性计算模型,提出光学隐身卫星设计策略,分别对卫星平台构型、太阳能帆板、半球形遮光罩进行设计,对整星外形进行仿真分析,最后提出分布式卫星的构想.结果表明,该卫星构型光学横截面积峰值达到0.082 m^2,该构型设计具有较高的隐蔽性,不易被光学监视系统探测识别.

摘要：介绍了运用可控源音频大地电磁测深法解决沂沭断裂带岩溶裂隙型热储深部地热勘查的问题。由于热储层埋藏较深,覆盖层较厚,深部构造裂隙发育,常规勘查方法难以实现。凭借CSAMT法的勘探优势,结合深部岩溶发育规律及地热流体形成条件,设计了一眼地热井,后经钻探验证,技术方法可行,找矿成果良好。不仅在沂沭断裂带实现深部地热找矿突破,对研究该区岩溶裂隙型热储成矿规律具有指导意义。

摘要：Stress analysis and optimization of combined die structure with two stress rings were *** thermoelastic deformation,the contact pressure at the interfaces between layers was ***,theoretical expressions of stress distribution for the combined die were *** thermal-mechanical effect under working conditions was *** verify the theoretical expressions,simulation work was *** of die design was carried out by defining radius ratio and shrink fit coefficient as optimization *** objective was to minimize the effective circumferential stress at the inner surface of the die insert,under the constraint that the maximum equivalent stress values of die insert and stress rings did not exceed their respective yield *** Kriging model was used to describe the influence of shrink fit and die dimensions on the objective function and the maximum equivalent *** a genetic algorithm,optimum parameters were found with a minimum circumferential stress of 442.9 MPa under a working stress of 1800 *** analysis of five selected optimal results was carried out,and the specific design parameters of these combined dies are different under the same level of circumferential stress,and the combined die is overdesigned if the thermal effect is ignored.

摘要：To design novel phenanthroline-derived soft ligands for selectively separating minor actinides from lanthanides, four tetradentate phenanthroline-derived heterocyclic ligands(BTPhen, BPyPhen, BPzPhen, and BBizPhen) were constructed and their complexation behaviors with Am(ⅡI) and Eu(ⅡI) were systematically investigated by density functional theory(DFT) coupled with relativistic small-core pseudopotential. In all the 1:1-type species, the metal ion is in the center of the cavity and coordinates with two nitrogen atoms(N1 and N1′) of the phenanthroline skeleton and the other two nitrogen atoms(N2 and N2′) of the auxiliary groups. The bond lengths of Am–N are comparable to or even shorter than those of Eu–N bonds because the ionic radii of Am(ⅡI) are larger than those of Eu(ⅡI). Additionally, the negative ΔΔGAm/Eu value for the reaction of [M(H2O)4-(NO3)3] + L → ML(NO3)3 + 4H2 O indicates that the complexation reaction of Am(ⅡI) is more energetically favorable than that of Eu(ⅡI); this can be considered as an important design criterion to screen phenanthroline-derived ligands for MA(ⅡI) extraction. According to this criterion, the selectivity of tetradentate phenanthroline-derived ligands for separating Am(ⅡI) over Eu(ⅡI) follows the order of BTPhen > BBizPhen > BPyPhen > BPzPhen.

摘要：针对中国东北地区玉米秸秆粗壮量大、不易腐烂,造成免耕播种机破茬防堵装置秸秆根茬切断率低和作业所需切割扭矩大的技术难题,以蝗虫口器多段阶梯锯齿状结构和双上颚异向等速咬合运动方式为仿生原型,设计一种可在东北地区实现高效破茬防堵作业的动态仿生破茬装置。通过仿生构建、机构设计、理论分析和参数优化等方法设计了行星齿轮变速机构和仿生破茬刀;运用Arduino系统和智能控制方法设计了智能驱动系统,实现了运动方式-结构耦合仿生;通过参数优化试验和回归分析等方法,研究了结构和作业参数对秸秆切断率和切割扭矩的影响规律,并得出最佳参数组合:作业速度为10 km/h,回转半径为250 mm,正转破茬刀仿蝗虫口器刀片数量为9,反转破茬刀仿蝗虫口器刀片数量为18;最终通过对比试验得出动态仿生破茬装置相较于被动缺口圆盘破茬刀可提高秸秆根茬切断率22.6%~27.4%;相较于驱动缺口圆盘破茬刀可提高秸秆根茬切断率8.6%~13.5%,降低扭矩输出19.5%~21.8%;作业后使用共聚焦激光扫描仪进行耐摩擦磨损对比试验,其平均表面粗糙度和最大磨痕深度相较于驱动缺口圆盘破茬刀分别下降14.5%和15.9%。

摘要：设计了一款前置灭茬深松、后置旋耕的悬挂式联合整地机。简述了整机结构和工作原理,灭茬、深松、旋耕和镇压起垄部件设计以及动力传递系统方案。整机试验表明,1ZQHF-350/5型联合整地机能够提高拖拉机稳定性;较单独后悬挂式同幅宽整地机,油耗降低6.2%,碎土率提高2.3%,破茬率提高5.8%。

摘要：[目的]随着风光耦合制氢项目规模的增大和数量的增多,为了满足可再生能源制氢系统设计、主设备选型和经济方案比选需要,文章结合多个风光氢储一体化项目设计经验,提炼出风光耦合制氢系统典型设计方案,给出设计选型的依据。[方法]文章从风光氢储装机容量配置方案、电解制氢设备性能、整流电源选型、氢氧分离和纯化设计,以及经济性和绿氢市场等方面介绍风光耦合制氢设计方案。[结果]装机容量配置可通过约束条件采用开发的设计软件匹配优化;制氢设备选型现阶段仍以碱性电解装备为主,质子交换膜(Proton Exchange Membrane,PEM)电解装备可做小规模工程示范;晶闸管和绝缘栅双极型晶体管(IGBT,Insulated Gate Bipolar Transistor)整流电源各有优点,IGBT整流逐渐有工程应用;氢氧分离和纯化可根据项目规模特点作相应配置优化,节约投资;风光制绿氢市场规模巨大,随着化石能源价格高企和风光制氢系统造价降低,加之产品的绿色属性,绿氢已初具经济性。[结论]风光耦合制氢项目仍处于起步示范阶段,需要装备技术进步、设计方案优化和一定的政府政策支持,共同促进绿氢产业发展。

摘要：精密锻造是一种近净成形或净成形技术,来自工业界的现实需求推动了该项技术的发展。针对精锻工艺、锻造模具、复杂件锻造成形以及数值模拟在精锻中的应用分别作了介绍。在工艺方面,出现了具有代表性的温锻-冷锻联合成形、分流锻造成形、流动控制成形、冲锻复合成形与闭塞锻造等新型精锻工艺;在模具结构设计方面,形成了新的方法与理念;在复杂零件的开发方面,围绕具体零件开展的工艺创新与实践依然十分活跃,虽然受到一定的应用限制,但仍具有重要的实际意义;在数值模拟技术应用方面,不断成熟的数值模拟技术使用广泛且逐渐成为必备的研发分析工具。结合以上精锻技术的发展现状,指出了精锻技术在未来的发展趋势。