温度和车速对半刚性基层沥青路面 模量场和疲劳寿命的影响

为分析半刚性基层沥青路面中沥青层模量在时间域和空间域上的分布特征,研究模量场年变化对结构层疲劳寿命的影响,将沥青面层细分为1 cm厚的亚层,基于Odemark法经迭代计算得到了沥青层中的模量场分布,分析全年456种工况下路面结构的力学响应,基于Miner线性疲劳损伤模型计算得到了考虑模量场影响的疲劳寿命修正系数.结果表明:模量场随时间显著变化,车速为70 km/h时,沥青层各深度处的模量年最大与最小值之比达20.1～34.9,且同一时间沿路面深度方向的模量不相等;车速对模量场有显著影响,车速120 km/h与10 km/h时,沥青层模量之比达1.12～2.28;路面结构的疲劳寿命分析中,应考虑模量场年变化的影响,在20℃、10 Hz标准工况下分析得到的上基层疲劳寿命偏保守,下基层疲劳寿命偏危险,建议采用考虑模量场影响的疲劳寿命修正系数调整标准工况下计算得到的结构层疲劳寿命.     

网络参数的可解性与可诊断性

本文研究了网络元件参数值的可解性与可诊断性问题，在已经获得的有源网络拓扑分析表达式的基础上，提出了以网孔分析为出发点的故障诊断方程，这是故障诊断的重要方程。     

有源网络拓扑分析与网络的故障诊断

本文研究有源网络的故障诊断问题，着重研究其可解性与可诊断性，在分析两种形式的有源网络典型支路和基础上，把无源网络的网孔方程、节点方程、回路方程、割集方程推广为有源网络下的相应方程，并提出了一组基于节点分析的故障诊断方程，最后，提出了关于网络理论第三类问题的扼要观点。     

使用CCD测量玻璃管内液体界面位置的灵巧测量头

本文介绍一种使用线阵ＣＣＤ进行玻璃管内液位测量的光电测量头。与其他ＣＣＤ尺寸测量的光学系统不同，本文依据不同的液体具有不同的折射率，提出利用柱形容器中液体的聚光特性，得到两种不同液体的分界面在线阵ＣＣＤ上清晰的像。     

广西昆虫生态地理概要

广西已定名的昆虫计有５９０１种，分别隶属２９目３３１科２８０６属。本文系从昆虫生态地理角度，论述了广西昆虫的区系结构、分布特点和规律，探讨了广西昆虫地理区划。在昆虫种类组成方面，鞘翅目、鳞翅目、膜翅目、半翅目、双翅目、同翅目、直翅目、等翅目等８个目的昆虫种数约占广西昆虫总种数的９４．３％。在区系结构方面，广西地处东洋区的北部，各区系成分的排序为：东洋区系种＞东洋—古北兼有种＞本区特有种＞世界广布种＞古北区系种。在东洋区系内，以中—缅亚区种明显大于马—菲亚区种。本文在详细论述昆虫生态地理分布特点及其规律的基础上，探讨了广西昆虫地理区划，大致将广西划分为５个昆虫治理开发区：Ⅰ桂东北区；Ⅱ桂西北区；Ⅲ桂东南区；Ⅳ桂西南区；Ⅴ桂南区。并对各区害虫发生与发展的预报、控制和有计划合理开发利用益虫提出了建议。     

使用多个线阵CCD-计算机系统实时监控多界面位置

本文提出一套多界面位置实时监控系统。该系统采用八个线阵ＣＣＤ像感器分别接收每个界面的光学图像。按照控制程序的设定，适时点亮界面的照明光源，同时驱动ＣＣＤ开始工作，并在采集完界面位置信息后，关掉照明光源及ＣＣＤ，以延长系统的寿命，实现长期连续工作。为了同时分别监控多个界面，设计了专用微机接口电路，通过硬件电路实现各界面数据的同时锁存，然后将每个ＣＣＤ的光电信号采入计算机，解决了目视读数无法保证多处数据在时间上一致性的困扰。运用该系统监控多处油水界面，每处均可在１００ｍＬ体积的检测管内测量到０．１ｍＬ的界面变化。     

一些图的Double图的点可区别全色数

文献【2】定义点可区别全染色,对—个图其所用最少染色数称为它的点可区别全色数．本文得到了星、扇和轮的Double图的点可区别全色数．     

Designing a Perylene Diimide/Fullerene Hybrid as Effective Electron Transporting Material in Inverted Perovskite Solar Cells with Enhanced Efficiency and Stability

Electron transport materials (ETM) play an important role in the improvement of efficiency and stability for inverted perovskite solar cells (PSCs). This work reports an efficient ETM, named PDI‐C₆₀, by the combination of perylene diimide (PDI) and fullerene. Compared to the traditional PCBM, this strategy endows PDI‐C₆₀ with slightly shallower energy level and higher electron mobility. As a result, the device based on PDI‐C₆₀ as electron transport layer (ETL) achieves high power conversion efficiency (PCE) of 18.6 %, which is significantly higher than those of the control devices of PCBM (16.6 %) and PDI (13.8 %). The high PCE of the PDI‐C₆₀‐based device can be attributed to the more matching energy level with the perovskite, more efficient charge extraction, transport, and reduced recombination rate. To the best of our knowledge, the PCE of 18.6 % is the highest value in the PSCs using PDI derivatives as ETLs. Moreover, the device with PDI‐C₆₀ as ETL exhibits better device stability due to the stronger hydrophobic properties of PDI‐C₆₀. The strategy using the PDI/fullerene hybrid provides insights for future molecular design of the efficient ETM for the inverted PSCs.     

Freestanding Carbon Nanotube Film for Flexible Straplike Lithium/Sulfur Batteries

Flexible lithium/sulfur (Li/S) batteries are promising to meet the emerging power demand for flexible electronic devices. The key challenge for a flexible Li/S battery is to design a cathode with excellent electrochemical performance and mechanical flexibility. In this work, a flexible strap-like Li/S battery based on a S@carbon nanotube/Pt@carbon nanotube hybrid film cathode was designed. It delivers a specific capacity of 1145 mAh g⁻¹ at the first cycle and retains a specific capacity of 822 mAh g⁻¹ after 100 cycles. Moreover, the flexible Li/S battery retains stabile specific capacity and Coulombic efficiency even under severe bending conditions. As a demonstration of practical applications, an LED array is shown stably powered by the flexible Li/S battery under flattened and bent states. We also use the strap-like flexible Li/S battery as a real strap for a watch, which at the same time provides a reliable power supply to the watch.     

Poly(ether ketone)s bearing pendent sulfonate groups via copolyacylation of a sulfonated monomer and isomeric AB‐type comonomers

Poly(ether ketone)s bearing pendent sulfonate groups (SPEK‐x/y/z) have been successfully synthesized via copolyacylation of a presulfonated monomer SBP and two isomeric AB‐type self‐condensable comonomers, that is, 4‐phenoxybenzoic acid (p‐POBA) and 3‐phenoxybenzoic acid (m‐POBA). Proton‐exchange membranes (PEMs) with precisely controlled ion‐exchange capacity (IEC) and high strength can be readily prepared from these ionomers. PEMs prepared from p‐POBA other than m‐POBA exhibit much higher dimensional stability and proton conductivity at elevated temperature above 60 °C, showing prominent isomeric (para vs. meta) effects of polymer structural units. Furthermore, properties of PEMs prepared from p‐POBA are optimized by tuning IEC. SPEK‐1.0/2.2/0 with an IEC of 1.84 mmol g^?1 exhibits acceptable swelling, much higher proton conductivity, and lower methanol permeability than commercial Nafion 115, implying potential application in direct methanol fuel cells. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52, 200–207