非均匀卵砾石粗糙床面的分形特征

针对传统方法刻画粗糙床面总体特征存在缺陷的问题,将分形几何理论引入非均匀卵砾石粗糙床面特征研究,以卵砾石床面激光扫描试验资料为基础,探讨了分形尺度区宽度与中值粒径d50的关系,分析了覆盖基准面对分形维数的影响,研究了床面整体与局部分形维数的特征与联系,获得了分形维数随床面颗粒组成及高程统计参数的变化规律。结果表明:分形尺度区宽度与床面颗粒中值粒径d50有关,上临界尺度可取为1.5d50;分形维数与覆盖基准面位置有关,覆盖基准面距平均床面的距离越大,分形维数越大且逐渐失真,为有效量化和区分床面粗糙特征,覆盖基准面宜取平均床面;粗糙床面分形维数具有良好的稳定性,局部分形维数变异性很小,并与整体分形维数接近;粗糙床面的分形维数与颗粒大小、级配组成及床面高程统计参数有关,中值粒径越大,颗粒组成越均匀,床面高程极差、标准差、偏度(绝对值)和峰度越大,分形维数越小。     

酸性镀锡液的新进展

从近几年美国发明专利的角度扼要综述酸性镀锡液的新进展。说明酸性镀锡液由氟硼酸盐型发展为烷基磺酸盐型的改进过程。列出参考文献９篇。     

Transport of Gellan Gum Microbeads in Soil Columns of Various Grain Size Distributions

The transport of gellan gum microbeads as potential cell carriers was investigated in horizontal columns packed with different grain size classes of gravel (2–16 mm) and sand (0.25–2 mm). A suspension of microbeads was pulsed into each column for 6 h, followed by injection of water for 42 h. In general, the total amount of microbeads travelling across a given section of the column increased with injection time but decreased towards the column outlet, varying as a direct function of grain size. The results of this study demonstrate the feasibility of the transport of gellan gum microbeads through medium sand to medium gravel across distances up to 110 cm.     

电石渣在酸性废水治理中的应用

叙述了用电石渣做中和剂，治理酸性废水的“以废治废”方法，阐述了电石渣与酸性废水的反应原理运行方式及沉渣产生量的计算方法，并列举了两个应用实例。     

球磨效率探讨

主要讨论了球石的装载量、球石空隙率、球石级配、泥浆密度等因素对球磨效率的影响。运用正交试验优选了各因素。     

酸性铵盐沉钒条件实验研究

以温度、时间、搅拌强度为变量，以沉淀率、抽滤后滤饼含水量、烘干后多钒酸铵(APV)中杂质含量等作为评价指标，对酸性铵盐沉钒条件进行了研究. 结果表明：以含钒30 g/L左右的溶液为原料，加硫酸铵后用硫酸调节pH至2.2左右，沸水浴(95℃)中沉淀120 min左右，桨式搅拌转速300 r/min，可获得99%以上的沉淀率，抽滤滤饼含水量20%以下，烘干后APV含Na 0.70%~ 1.08%, S 0.78%~1.20%.     

级配碎石柔性基层固体体积率指标研究

级配碎石的固体体积率是其级配设计的重要控制指标,对级配碎石的强度和抗变形能力有着重要的影响,本文通过大量的试验研究了级配设计、粗集料性能以及细集料性能对级配碎石固体体积率指标的影响规律,提出了固体体积率的指标控制取值,为级配碎石的设计和施工提供了有利的参考。     

汉画像石的文化渊源

作为汉代厚葬习俗的产物,汉画像石的出现和发展,既有一定的物质基础作为保障,更有思想文化的深层背景。分别从楚文化、道教文化、儒家文化、汉代精神四方面阐述了其对汉画像石的影响。     

A new process of extracting vanadium from stone coal

A new process of extracting vanadium from the stone coal vanadium ore in Fangshankou, Dtmhuang area of Gansu Province, China was introduced. Various leaching experiments were carried out, and the results show that the vanadium ore in Fangshankou is difficult to process due to its high consumption of acid and the high leaching rate of impurities. However, the leaching rate can be up to 80% and the content of V2O5 in the residue can be between 0.22%-0.25% in the process of ore fine grinding→oxidation roasting→mixing and ripen-ing→aqueous leaching→P2O4 solvent extraction→sulfiuie acid stripping→oxidation and precipitation→decomposition by heat. Also, the quality of flaky V2O5 produced by this process can meet the requirements of GB3283-87. The total leaching rate of vanadium is 70%. Also, three types of wastes are easy to treat. The vanadium extraction process is better in relation to the aspect of environmental protection than the sodium method.     

夯扩挤密碎石桩处理液化砂土

目的 消除砂土液化,保证处理深度范围内地基土上下均匀,为液化砂土桩处理探索新的途径.方法 夯扩挤密碎石桩采用相同的夯击能量和贯入度控制桩体质量,以高能量施工设备进行孔内夯击填料,振动和挤密桩底和桩间土,使松散砂土颗粒重排,提高砂土的承载力和压缩模量.笔者对比分析夯扩挤密碎石桩在沿海高速路基工程上的应用实例.结果 采用夯扩挤密碎石桩复合加固地基,可提高砂层标贯锤击数30%,消除砂土液化现象,提高地基承载力,与振冲桩相比节省造价约20%.结论 夯扩挤密碎石桩方法工艺简单,施工质量易保证,节约水资源;夯扩挤密碎石桩对于公路路基工程,具有广阔的应用前景,开辟了处理砂土液化的新途径.