无机结合料中含石量与最大干密度关系的研究与应用

通过对高速公路路面基层底基层中的施工实例,论证了检测含石量是控制实际最大干密度的有效快捷手段,证实无机结合料含石量与最大干密度存在线性关系。     

无机陶瓷膜处理餐饮废水的研究

研究了无机陶瓷膜处理餐饮废水的操作条件对膜通量及COD(Chemical Oxygen Demand)去除率的影响。实验结果表明:操作参数对膜通量及餐饮废水的COD去除率均有一定影响。过滤压差增大,膜通量增大;膜孔径增大及运行温度升高,膜通量增大;小孔径的陶瓷膜对COD的去除效果较好;进水浓度越高,COD的去除率越高;而膜内压力对COD去除率的影响不大。     

浅谈捣实法无机结合料配合比设计

从工程实践角度介绍了捣实法无机结合料配合比设计的过程.     

排水性沥青路面降温性与效果分析

目前沥青路面车辙病害现象严重,为了降低车辙的严重程度,对车辙产生的原因作详细论述,并提出沥青路面降温的必要性及关键面层。针对各面层降温的程度不同,因此在国内比较早地在各面层中埋设温度传感器,监测中面层及下面层温度,对不同面层进行温度比较分析。结果表明,排水性沥青路面对中面层和下面层的降温程度均比SMA路面高。中面层降温效果的显著将有助于节约修筑道路的资金,降低修筑成本。     

On the relation between organic and inorganic carbon in the Weddell Sea

Carbon cycling in the Weddell Sea was investigated during the ANT X/7 cruise with `FS Polarstern' December 1992–January 1993. Samples were taken on a cross section from Kapp Norvegia to Joinville Island, and on a section from the Larsen Ice Shelf to the northeast. The following quantities were measured: total carbon dioxide (TCO₂), fluorescence from humic substances and total organic carbon. The distribution of TCO₂ was strongly positively correlated to the time elapsed since the various water masses were last ventilated. In general, humic substance fluorescence was positively correlated with TCO₂, with the exception of the productive part of the western Weddell Sea, where the correlation was negative in the surface mixed layer. The increased fluorescence at the surface is suggested to be a result of biological production. The distribution of total organic carbon showed less structure, since this quantity includes a particulate component, which is subject to dispersion processes different from those of the dissolved components TCO₂ and humic substances. The mean total organic carbon concentration below the surface mixed layer was 50 μmol l⁻¹. At some stations, a steep TOC maximum around 2000 m depth was observed. This was interpreted to result from mass sinking of phytoplankton blooms. Total organic carbon had a maximum in surface water, and at some stations also a second subsurface maximum. In the Warm Deep Water (WDW), TCO₂ and fluorescence had their maximum values, while total organic carbon tended to be low. In low productivity surface water in the eastern part of the Kapp Norvegia–Joinville Island section, the lowest flourescence was found. Surface water is eventually formed from Warm Deep Water, which had the highest fluorescence values, and therefore it is concluded that humic substances were removed in situ from surface water. In the central area of the Weddell Sea, TCO₂ and fluorescence showed the highest Warm Deep Water maxima, while total organic carbon was low. The Warm Deep Water in this area is part of the so-called Central Intermediate Water which circulates for a long time within the Weddell Gyre. Reduced total organic carbon, which coincides with the most pronounced Central Intermediate Water characteristics, and high TCO₂ can thus both be accounted for by continued degradation of organic matter in this water mass. The associated fluorescence maximum implies that humic substances are also produced during mineralisation. Recently formed bottom water, by contrast, could be seen as patches of low TCO₂, low fluorescence and high total organic carbon along the western slope of the Weddell Sea.     

Bioethanol Fermentation from Stalk Juice of Sweet Sorghum by Immobilized Yeast

Nowadays, energy is the key and seriousproblem in most countries of the world with theexhausting fossil-fuel resources and more increas-ing consumption demands. Meanwhile any energysource should be evaluated with consideration of itsenvironmental impacts[1]. So refining renewableenergy from green plants is the major project.Some countries rich in agricultural resources ex-ploit vigorously carbohydrate crops and starchcrops to refine ethanol and develop alternative fu-els, such as Brazil, Amer…     

水溶液中以无机阴离子为掺杂剂动电位法合成聚吡咯

以HCl、KCl、NaCl、NH4Cl、NaNO3、Na2SO4和Na3PO4为掺杂剂动电位法快速合成聚吡咯,聚吡咯的循环伏安特性在0.1M磷酸盐缓冲液中表征.结果表明,掺杂剂阳离子不同,对聚吡咯膜的性质影响不大,而对于化合价为单价、二价及三价的不同阴离子掺杂聚吡咯的性质有明显不同.     

生物油再生沥青胶结料路用性能分析

为研究生物油再生沥青胶结料的路用性能，分析比较了基质沥青与生物油再生沥青胶结料的流变性质与化学特性。首先通过三大指标与黏度测试确定生物油在老化沥青中的最佳掺量；之后重点分析最佳生物油掺量下再生沥青与基质沥青的高温与疲劳性能，高温性能通过多应力蠕变回复试验（MSCR）测试，疲劳性能通过DSR时间扫描测试；最后利用红外光谱（FTIR）和凝胶渗透色谱（GPC）测试分析2种沥青的化学特性。研究结果表明：10%生物油可恢复老化沥青针入度与延度至基质沥青水平；基质沥青与10%生物油再生沥青的PG分级分别为PG64-16与PG70-16；MSCR结果表明再生沥青相比基质沥青具有较好的高温性能；N_f50指标表明再生沥青的抗疲劳性能较基质沥青胶结料更好，因为2种沥青模量相近，再生沥青的弹性组分含量更高；FTIR结果表明生物油稀释了老化沥青中高极性的亚砜基；GPC结果表明生物油降低了老化沥青中的大分子和小分子含量，改善了老化沥青分子量分散度。生物油改善了老化沥青的路用性能和化学特性，是一种较有潜力的沥青再生剂。     

叠氮类含能粘合剂研究进展

介绍了几种主要的叠氮类含能粘合剂及其各自的物理化学性质、性能和优缺点,总结了这几种叠氮类含能粘合剂作为推进剂组分时的燃速及压力指数等数据,展望了叠氮类含能粘合剂的应用前景。     

无机结合料稳定低液限粉土路用性能试验研究

为了研究水泥、石灰等无机结合料稳定低液限粉性土的路用性能,对石灰和水泥稳定粉性土的混合料配比进行了设计,通过无侧限抗压强度试验、劈裂强度试验和水稳定性试验,对其路用性能进行了评价。结果表明,8%的石灰稳定粉性土和5%水泥稳定土满足二级及二级以下公路基层要求,8%的石灰稳定粉性土水稳定较差,不适合用于水文地质条件较差路段。