摘要：The development of metal sulfide catalysts with remarkable activity toward efficient overall photocatalytic water splitting remains challenging owing to the dominant charge recombination and deficient catalytic active ***,in the process of water oxidation catalysis,the inhibition of severe photocorrosion is an immense task,requiring effective photogenic hole-transfer ***,stratified Co-MnO_(2)@CdS/CoS hollow cubes with spatially separated catalytic sites were rationally designed and fabricated as highly efficient controllable catalysts for photocatalytic overall water *** unique self-templated method,including a continuous anion/cation-exchange reaction,integrates a Co-doped oxidation co-catalyst(Co-MnO_(2))and a reduction co-catalyst(CoS)on the nanocubes with uniform interface contact and ultrathin two-dimensional(2D)nanometer *** demonstrate that the stratified Co-MnO_(2)@CdS/CoS hollow cubes can provide an abundance of active sites for surface redox reactions and contribute to the separation and migration of the photoionization charge *** particular,CoS nanoparticles dispersed on the walls of CdS hollow cubes were identified as reduction co-catalysts accelerating hydrogen generation,while Co-MnO_(2) nanosheets attached to the inner walls of the CdS hollow cube were oxidation co-catalysts,promoting oxygen evolution *** from the desirable structural and compositional advantages,optimized stratification of Co-MnO_(2)@CdS/CoS nanocubes provided a catalytic system devoid of precious metals,which exhibited a remarkable overall photocatalytic water-splitting rate(735.4(H_(2))and 361.1(O_(2))μmol h^(−1) g^(−1)),being among the highest values reported thus far for CdS-based ***,an apparent quantum efficiency(AQE)of 1.32%was achieved for hydrogen evolution at 420 *** study emphasizes the importance of rational design on the structure and composition of photocatalysts for overall water splittin

摘要：随着轨道交通车辆自动驾驶技术的兴起,网络控制系统的安全性与可靠性标准越来越高,而在可信系统设计中,冗余设计是提高系统可靠性与安全性的必要技术。针对既有网络控制系统自身存在的不足,如单系统在故障后需要人为干预、原有冗余系统切换延时大、切换存在通信周期丢失以及同步精度差(延时导致毫秒级误差)等缺陷,文章提出一种高精度同步与高可靠冗余的网络控制系统设计方案,其通过采用硬件触发的软件节拍控制、优化软件通信效率以及消除累计时间差等方式来保证系统同步精度,且采用了一种基于主控制器优先从控制器跟随的策略来保证系统的无扰切换。试验验证结果表明,本方案不仅实现了主控制器和从控制器之间高精度同步,同步精度误差降低至30μs以下,且通过冗余异构设计,在避免带来共因失效的同时,显著提高了系统的可靠性与可用性。

摘要：针对无固定站台的货运站在装卸载大型车辆或设备时通常需借助吊车或大型叉车进行作业保障且作业效率低下等情形,主要以解决铁路平车侧方卸载为研究思路进行通用平台的方案设计,通过载荷计算校核、加工试制原理样机,最后经过静态和动态试验验证了所开发平台的可靠性和安全性,为无固定站台货运站大型车辆或设备的安全卸载提供一种解决路线和技术方案。

摘要：介绍了采用地震映像法和高密度电法对广州市白云区某场地地下土洞和溶洞情况进行物探勘查。勘查结果揭示了场地内溶洞、土洞的发育情况、分布规律及充填物,以及上部岩层的厚度情况。与钻探资料对比表明,物探推断与钻探资料较吻合,地质效果良好。综合勘查方法揭示了对类似场地的岩溶探测问题的有效解决方案。

摘要：为了进一步提升高速列车变流器在运行过程中的冷却性能,提高变流器设备舱的通风冷却效率,本文针对某型动车组牵引变流器通风性能进行了实车试验研究,通过在变流器进排风口位置布设传感器,监测高速列车运行过程中变流器设备舱进排风口位置处的进风风量、排风风量.对通风风量的结果和通风风量随列车运行状态的变化规律进行分析,并与变流器散热水温温升规律进行对比分析.分析发现当8车作为头车运行时,行车风方向与风机排风方向一致,促进排风,当1车作为头车运行时,行车风方向与风机排风方向相反,抑制排风.最大抑制风量占列车静置风机全速风量的1.6%.本文研究结果可为高速列车设备舱牵引变流器的设计选型及安装布置方式提供指导.

摘要：MYB类转录因子KAN4(KANADI4)在红麻类黄酮合成和纤维发育中发挥着重要作用。本研究以红麻品种‘福红952’为材料,对HcKAN4基因进行克隆和表达模式分析,探讨TRV-VIGS诱导该基因沉默对类黄酮合成途径中关键酶基因表达量改变的影响。基因克隆显示,HcKAN4基因开放阅读框(open reading frame,ORF)全长为966 bp,编码322个氨基酸,包含一个MYB保守结构域。进化树分析发现,其与拟南芥和木槿KAN4s的亲缘关系较近。表达分析表明,该基因在红麻不同组织中均有表达,且转录水平随着植物生长而递增。VIGS诱导基因沉默显示,6株HcKAN4的转录水平显著下调,达到基因沉默效果。进一步实时荧光定量PCR检测发现,类黄酮合成相关基因HcCHS、HcF3’5’H、HcANS、HcANR的转录水平显著下调,分别是对照组的0.51、0.14、0.23、0.11倍,表明HcKAN4基因可调控红麻类黄酮生物合成相关基因。这些结果为阐明红麻MYB转录因子调控类黄酮合成提供了依据,同时为改善纤维品质提供了研究思路。

摘要：论文研究卸载集装箱堆场空间分配与车辆调度的集成作业问题.在该问题中,卸载集装箱动态到达,车辆循环使用,需要同时决策集装箱堆放位置及车辆的分配和路线.对此问题建立整数规划数学模型,考虑车辆调度约束以及堆场吊机操作等实际约束,目标函数为最小化makespan.根据问题的特点设计两阶段禁忌搜索算法来求解此问题.在实验中,通过将禁忌搜索算法的结果同标准优化软件CPLEX所求得的最优解或下界比较,算法求得了其中7组算例的最优解且剩余算例平均偏差小于5%,说明所设计的算法可以有效地解决该集成问题.

摘要：The NEW GIFT Nile tilapia （Oreochromis niloticus niloticus L.） is a nationally certificated new strain selected over 14 years and 9 generations from the base strain of GIFT Nile tilapia, introduced in 1994. This new variety has been extended in most of areas of China. The management of genetically improved strains, including the genetic markers for identification is needed urgently. RAPD analysis was conducted and their conversion to SCAR markers was developed. From NEW GIFT Nile tilapia, two strain-specific RAPD bands, S304624 bp and S36568 bp were identified. The strain-specific RAPD bands were gel-purified, cloned, and sequenced. Locus-specific primers were then designed to amplify the strain-specific bands. PCR amplification was conducted to test the variations in allele frequencies of two converted SCAR markers among the NEW GIFT Nile tilapia and its base strains, as well as 7 additional farmed strains worldwide. The frequency of SCAR marker Ⅰ （553 bp） was 85.7% in NEW GIFT Nile tilapia, but 16.7% in the base strain. The frequency of SCAR marker Ⅱ （558 bp） was 91.4% in NEW GIFT Nile tilapia, but 0% 70% in the 7 other strains. In order to confirm the utility of these two markers, an examination was conducted for a wild population from Egypt, resulted the frequency of SCAR Ⅰ and Ⅱ was 10% and 70%, respectively, much lower than that of New GIFT strain. The increase in allele frequency of these two SCAR markers suggests that these markers might be genetically linked to the quantitative trait loci （QTL） underlining the performance traits by long term selection, and indicate the bright potential of SCAR marker technology for tracking generations during selection progress and for distinguishing among genetically improved strain and other strains.

摘要：干式铁心电抗器长期处于电磁、热及应力等物理场中,其温升和振动问题日益严重。为了解决上述问题,提高金属导体材料的利用率,该文提出了干式铁心电抗器多物理场耦合仿真与协同优化相结合的设计方法。首先分析铁心电抗器温升及振动机理,指出影响铁心电抗器温升及振动的主要因素。然后,搭建干式铁心电抗器系统级协同优化模型。温升方面采用包封线圈-气道单元散热效率优化方法,在振动方面采用Kriging近似模型优化方法,通过灵敏性分析将设计变量划分为敏感和不敏感2个层次。最后,采用多岛遗传算法获得最佳的设计,仿真结果验证了优化设计方法的正确性。优化结果表明,该文提出的干式铁心电抗器多物理场协同优化设计方法,在满足电感、温升和振动等参数的前提条件下,绕组和铁心的用量分别减少了17.1%和6.7%,显著提高了金属导体利用率。

摘要：散热天线是一种兼具电磁辐射特性和散热性能的新型结构,可以实现天线和散热器的功能一体化,提高系统的集成度.本文针对无线通信集成系统的散热天线发展历史和技术现状进行了综述,分别分析了散热单天线和毫米波散热天线阵列的典型结构以及电热协同设计方法的特点,最后对散热天线技术的发展方向进行了展望.本文认为多性能的协同设计理论以及与先进制冷方式的巧妙融合等,在5G无线通信领域将具有广泛的应用前景.