摘要：Recently, the power conversion efficiencies(PCEs) of all-polymer solar cells(all-PSCs) have increased rapidly. To further increase the PCE of all-PSCs, it is necessary to create new donor polymers matching the polymer acceptors. In this paper, we synthesize a new quinoxaline-based polymer donor PBQ8 with n-octyl side chain on the quinoxaline unit, which possesses the same skeleton structure to the previously reported PBQ5(with isooctyl side chain). The effects of alkyl side chains on the physicochemical properties of the polymer donor were investigated. In comparison with PBQ5, PBQ8 exhibits stronger intermolecular interactions and better molecular packing. When blending with polymer acceptor PY-IT, the PBQ8:PY-IT based devices demonstrated a higher PCE value of 17.04%, which is one of the highest PCEs occurred in the all-PSCs. And the PBQ5:PY-IT(PCE 15.56%, Voc0.907 V, FF 69.72%, and Jsc24.60 m A cm^(-2)) is much lower. The PBQ8:PY-IT blend displayed more efficient exciton dissociation, better molecular stacking properties, preferable phase separation and higher mobility. These indicate that as an effective method, side chain engineering can improve the efficiency of the all-PSCs.

摘要：Perovskite solar cells(pero-SCs)performance is essentially limited by severe non-radiative losses and ion *** numerous strategies have been proposed,challenges remain in the basic understanding of their ***,we report a dielectric-screening-enhancement effect for perovskite defects by using organic semiconductors with finely tuned molecular structures from the atoms *** method produced various perovskite films with high dielectric constant values,reduced charge capture regions,suppressed ion migration,and it provides an efficient charge transport pathway for suppressing non-radiative recombination beyond the passivation *** resulting pero-SCs showed a promising power conversion efficiency(PCE)of 23.35%with a high open-circuit voltage(1.22 V);and the 1-cm^(2) pero-SCs maintained an excellent PCE(21.93%),showing feasibility for scalable *** robust operational and thermal stabilities revealed that this method paved a new way to understand the degradation mechanism of pero-SCs,promoting the efficiency,stability and scaled fabrication of the pero-SCs.

摘要：为确定氯氧镁水泥稳定碎石应用在路面基层结构中合理的胶凝材料组成,解决击实试验中变量不恒定的问题,采用相理论推导和正交设计试验,利用矩阵分析法,对影响氯氧镁水泥稳定碎石力学性能的因素进行了分析和验证。结果表明,相理论配比结合正交试验所得的配比最优组合与击实试验所得的配比结果一致,确定了氯氧镁水泥稳定碎石胶凝材料的最佳配比范围为轻烧粉掺量3.5%~4%,MgO/MgCl_(2)摩尔比6~7,MgCl_(2)浓度20%~22%。氯氧镁水泥稳定碎石混合料可以通过相理论配比来进行材料组成正交设计,解决了通过击实试验无法解决的MgCl_(2)浓度的问题,为氯氧镁水泥稳定粒料基层的后续研究奠定了理论基础。

摘要：高性能的柔性透明电极是实现高效柔性有机太阳能电池的关键因素之一.以银为代表的微纳金属透明电极,如网格银以及银纳米线等,具有高导电性、高透光性、优异的耐机械弯曲性以及低成本等特点,是柔性有机太阳能电池中常用的透明电极材料.在近10年的研究中,基于微纳银透明电极的柔性有机太阳能电池实现了光电转换效率的不断突破.本文首先介绍了网格银与银纳米线的几种不同的制备方法;接着对银纳米线薄膜导电性的优化方法进行了总结,并综述了基于微纳银透明电极的柔性有机太阳能电池的研究进展;最后对基于微纳银透明电极的高效柔性有机太阳能电池的后续研究所面临的挑战进行了展望.

摘要：我国古代碑刻不仅是对中华传统文化的记录和延续,亦是中外文化交流的重要载体,其丰富的文字信息、精美的边饰纹样等,具有很高的文化价值、艺术价值。本文仅就汉代碑刻边饰纹样开始兴起的历史原因、艺术特征以及文化意蕴等做一探讨,以就教于方家。

摘要：基于眼动试验，以广告牌设置参数（面积、高度、距离道沿距离）为分析对象，对驾驶员注视高速公路广告牌的视觉特性进行分析，研究广告牌设置参数对安全驾驶的影响。利用眼动仪测试驾驶员对广告牌的平均眼球移动速度、注视时间等数据，通过分析采集的数据，得出高速公路广告牌设置时应在满足相应法规的条件下以大面积、高尺寸为宜，距道沿的距离以4．8～7m范围为最佳。

摘要：为满足灵活扩展、安全可靠的建网需求,设计一种基于BGP MPLS VPN企业跨域组网方案在eNSP仿真平台搭建网络结构,在设备上部署OSPF、BGP、MPLS VPN等多种复杂协议,分析了BGP MPLS VPN技术中BGP对等体建立、VPN实例创建、MPLS标签分发与交换、VPNv4私网路由跨域传递等配置过程。仿真结果表明,方案提高了网络转发效率,保障了企业私网路由传递的安全性,较好地满足了企业网络建设需求。

摘要：汽车轻量化设计是在确保整车性能的基础上,对汽车整备质量进行最小化的设计。驱动桥的强度及刚度对整车的安全可靠有直接影响,卡车在承载质量以及使用寿命上更高的要求。论文在保证轻卡的强度和安全性能前提下,基于ABAQUS软件对整体后桥的疲劳耐久性做出分析论证。最终定型的85 mm×85 mm×6 mm方管整体冲焊式桥壳、上下半体材料均采用高强度钢QSTE460TM。在各工况条件下,都满足强度及刚度要求,分析结果表明,桥壳的轻量化设计是可行的。

摘要：针对铁路数据通信网分区域组网的现状,提出一种跨域铁路数据网综合组网设计方案,并在eNSP环境中进行仿真。方案在多AS区域、多协议作用场景中,实现了域内路由、域间路由、路由控制优化、跨域私网互通等高级路由控制。有效解决综合数据网设计、设备管理配置、结果分析测试、网络故障诊断等网络工程技术问题。方案可为设备维护人员提供技术帮助,为后续铁路数据网的线网建设提供有效依据和参考。

摘要：对NB虚拟化学实验的精点及设计原则进行了介绍,举例说明了NB虚拟化学实验的结果,并对该项研究进行了反思。