膨胀土路基CBR值的达标研究

采用生石灰和熟石灰时孝襄公路路基膨胀土进行改良处理，以提高路基承载能力，试验结果表明，掺加4％～7％的生石灰或者熟石灰，可以大大改善中型或弱型膨胀土的路用性能。改良后的膨胀土的CBR值达到了8％以上，最高达到70％以上，满足了路面设计对路基土的质量要求。     

国产快堆燃料元件包壳材料316不锈钢的中子辐照效应

介绍国产六种不同成分与工艺的快堆燃料元件包壳材料316不锈钢(316SS)经650℃高温、积分中子注量3.1×1021n/cm2(En>0.1MeV)的辐照概况,以及辐照后在650℃与室温下的拉伸力学性能试验和金相检查的结果及评述。     

对象池模式的扩展与设计

在object pool设计模式的基础上，研究了实际应用中对象池模型的共性接口和策略，设计了对象池的管理接口、对象建立与消亡接口、对象回收接口等，并根据这些接口提出了新的抽象扩展模型，为thread pool、connect pool等应用提供了基础模式。     

车用三元催化器故障诊断系统和实车检测装置的研究

作者在汽车的机外排放控制装置———三元催化器的失效原理的基础上 ,提出了汽车三元催化器故障诊断系统。该方案主要是检测发动机排气的参数和催化器的转化效率 ,通过这些特征参数诊断催化器故障。同时 ,对本系统采集的数据进行了分析 ,证实了该方法的可行性     

中子照相技术及其应用

本文简述中子照相的原理、方法和特征。包括中子源 ,中子转换屏 ,中子成像技术等关键技术。给出在 4 5MV静电加速器上快中子照相的结果。并概述中子照相技术的一些应用实例     

钢绞线混凝土黏结性能试验与锚固长度分析

为研究较大直径钢绞线与混凝土间的黏结锚固问题并提出合理锚固长度,针对15.2、17.8、21.6mm三类公称直径的高强低松弛钢绞线,以混凝土保护层厚度、体积配箍率及埋置长度为基本参数,完成了32个钢绞线的中心及偏心拔出试验.试验结果表明,不同参数水平条件下拉拔试件的破坏可分为两类,一是较薄保护层厚度与较小体积配箍率的少量试件劈裂破坏;二是在绝大部分试件中出现的表面未开裂但钢绞线拔出的破坏.结合破坏特征及拉拔力-滑移关系曲线,揭示了钢绞线混凝土间的黏结破坏机制,并以拉拔力-滑移曲线的峰值为破坏标志,提出了分别考虑3个参数影响的钢绞线混凝土黏结强度计算方法;结合本文试验结果,引入近似概率法,确定了满足相应可靠指标要求的钢绞线锚固长度设计值,可为装配式公共建筑结构中采用的大型先张预制预应力混凝土构件的设计提供技术支持.     

Multicolor carbon dots with concentration-tunable fluorescence and solvent-affected aggregation states for white light-emitting diodes

Multicolor emissive carbon dots (M-CDs) have tremendous potential applications in manifold fields of bioimaging, biomedicine and light-emitting devices. Until now, it is still difficult to produce fluorescence tunable CDs with high quantum yield across the entire visible spectra. In this work, a type of M-CDs with concentration-tunable fluorescence and solvent-affected aggregation states was synthesized by solvothermal treatment of citric acid (CA) and 1-(2-pyridylazo)-2-naphthol (PAN) and the formation mechanism was monitored by different reaction time and raw material ratio. The fluorescence spectra of M-CDs in organic solvents can range from 350 to 750 nm by adjusting the concentration. M-CDs possess different aggregation states in water and organic solvents, accompanied by different fluorescence emission, which is attributed to the different surface states of various component CDs in M-CDs. Moreover, the obtained products can be uniformly dispersed into polymethylmethacrylate (PMMA) solutions as well as epoxy resins to fabricate transparent CDs/PMMA films and CDs/epoxy composites, which can effectively prevent the aggregation and produce multicolor and white light-emitting diodes (WLED). In addition, the prepared WLED with Commission Internationale de L’Eclairage (CIE) of (0.29, 0.31) by using M-CDs/epoxy resin as packages, demonstrating the M-CDs exhibit potential applications for light-emitting devices.

     

从“流动的现代性”到“液态时尚”

本文主要通过齐格蒙·鲍曼的社会学著作《流动的现代性》(Liquid Modernity),讨论当代社会生活特性,并援引了原著中“Liquid”,即“液态、流动的”这一形容词,提出“液态时尚”这一与“流动的现代性”相适应的时尚概念。通过对“液态时尚”设计案例的分类分析,思考“液态时尚”在当代的社会意义和价值。     

A new strategy to reduce edge chipping using stress wave impedance matching

To restrain edge chipping and elucidate its mechanism during machining, the initiation of edge chipping was investigated in this study from the propagation properties of stress waves in the fractured media. Three technological principles of the support for chipping suppression were proposed to reduce the intensity of reflected extension waves, namely, the wave impedance matching, the smaller residual gap and the higher viscosity of the gap filler between the workpiece and the support. As demonstrated from the experimental results, using brass support with non-solid epoxy gap filler can significantly restrain the edge chipping of pressureless sintered silicon carbide during grinding.     

GITT studies on oxide cathode LiNi1/3Co1/3Mn1/3O2 synthesized by citric acid assisted high-energy ball milling

Layered LiNi_1/3Co_1/3Mn_1/3O₂ was synthesized by a citric acid assisted solid-state method. The structure and electrochemical properties of the LiNi_1/3Co_1/3Mn_1/3O₂ materials were investigated. XRD analysis indicated the as-synthesized LiNi_1/3Co_1/3Mn_1/3O₂ was with the layered α-NaFeO₂ structure. The discharge capacity was about 154 m·Ahg^???1 at 0·1 °C rate in the range of 2·0–4·5 V. The kinetics of the LiNi_1/3Co_1/3Mn_1/3O₂ materials was investigated by the galvanostatic intermittent titration technique (GITT) method. The lithium ion diffusion coefficient of the LiNi_1/3Co_1/3Mn_1/3O₂ was determined in the range of 10^???8??? 10^???9 cm²· s^???1 as a function of voltage of 3·7?4·5 V.