应力边界条件下饱和多孔介质的一维瞬态波动

采用基于混合物理论的多孔介质模型,提出了饱和多孔介质一维动力响应的初边值问题;利用拉氏变换和卷积定理,得到了在任意应力边界条件下瞬态波动方程的解析表达,为检验相关问题数值分析方法的精度和收敛性提供了依据。     

饱和含水土壤埋地原油管道冬季停输温降

建立了饱和含水土壤埋地原油管道在低于冰点环境温度下的停输流动和传热模型，该模型不仅考虑土壤水分结冰和管内原油凝固相变过程与初始温度场和流场的影响，而且考虑了水分在土壤多孔介质中和管内原油的自然对流。通过数值模拟，获得了停输期间温度场、流场以及土壤水分结冰界面和管道中原油凝固界面的分布情况。结果表明，停输期间越靠近管壁正上方的土壤，其温度梯度越大；受温度分布的影响，土壤水分和管内原油产生沿y轴对称线自下而上的自然对流；土壤水分结冰界面和管道中原油凝固界面随停输时间向埋深方向推进，管道顶部土壤中的结冰界面推进速度较远离管道土壤中的结冰界面缓慢，管内原油凝固界面也向埋深方向偏移。     

P1波在饱和土层和建筑基础界面的反射与透射

考虑了土颗粒、孔隙流体的压缩性及孔隙流体与土骨架之间的粘性耦合作用,采用修改的Biot模型分析入射P1波在饱和土体和建筑基础界面的反射与透射,得到了反射系数与透射系数的一般计算式,并对反射系数、透射系数随入射角、频率的变化规律进行了数值模拟.结果表明,入射角是影响反射和透射系数的主要因素.     

非饱和-饱和区域中重金属污染物运移数值模拟

为了定量整体描述非饱和-饱和区域内水流及溶质迁移过程,在基于非饱和流动理论及溶质运移理论基础上,建立了非饱和-饱和区域内水流方程与重金属污染物运移方程耦合的数学模型。采用V-G模型来描述土壤水分特征函数.用Lagrange-Quadratic方法进行求解并给出模拟结果:分析结果表明,在非饱和-饱和区域内的压力水头、饱和度以及污染物阻滞因子等参数均随含水率的变化而改变,这是区别于饱和流的主要特点。     

API P105油管钢在含CO2溶液中的电化学腐蚀行为

用电化学阻抗谱(EIS)和极化测量,研究了在含CO2的溶液中NaCl含量对API P105钢的电化学腐蚀行为的影响.结果表明,随着NaCl含量的增大,P105钢的腐蚀电位正移,抑制了腐蚀过程的阴阳极反应,降低了P105钢的腐蚀速率.分析表明,Cl在API P105钢表面的吸附为Temkin等温吸附.     

时效性对单桩极限承载力的影响分析

目前，盐城地区正广泛采用打入式预制桩和泥浆护壁成孔灌注桩。从这两种桩的成桩工艺，结合地基条件，对盐城地区饱和软粘土层中这两种桩成桩后休止时间对单桩极限承载力的影响规律进行了分析研究，并对载荷试验的间歇时间的确定问题作一些有益的探讨。     

粉煤灰的酸处理及其对染料脱色效果的影响

介绍了一种酸处理粉煤灰的方法。用 8mol/L的H2 SO4 处理粉煤灰 ,可较好地改善其表面状况 ,粉煤灰的饱和吸附量明显增大。用处理后的粉煤灰对染料进行脱色试验 ,寻找到了最佳的处理条件 ,取得了较好的脱色效果     

The ecological sequence of Hipparion fauna in the mid-dle reaches of the Yellow River during Neogene

The faunal ecological type and sequence in the Tertiary red clay indicate that Hipparion fauna during the period 7.4-6.1 Ma in the middle reaches of the Yellow River is composed mainly of dorcadoides and mixed types. This represents semiarid veld environment with small fluctuation. The fossil assemblages characterized by the abundance of gaudryi types and even the occurrence of some Hominoid and Chalicotherium indicate an obviously warm and humid period since 5.3 Ma. The fossil assemblages during 3.4 Ma show the typical steppe fauna representing dry climate. It is indicated by the changes of ecological sequence that the climatic conditions in Pliocene are drier than that in late Miocene. The clay-skin content of red clay, which has a synchronous change with faunal features, is a rather good replacing palaeoclimatic index.     

The ecological sequence of Hipparion fauna in the middle reaches of the Yellow River during Neogene

The faunal ecological type and sequence in the Tertiary red clay indicate that Hipparion fauna during the period 7.4–6.1 Ma in the middle reaches of the Yellow River is composed mainly of dorcadoides and mixed types. This represents semiarid veld environment with small fluctuation. The fossil assemblages characterized by the abundance of gaudryi types and even the occurrence of some Hominoid and Chalicotherium indicate an obviously warm and humi period since 5.3 Ma. The fossil assemblages during 3.4 Ma show the typical steppe fauna representing dry climate. It is indicated by the changes of ecological sequence that the climatic conditions in Pliocene are drier than that in late Miocene. The clay-skin content of red clay, which has a synchronous change with faunal features, is a rather good replacing palaeoclimatic index.     

尼龙6/粘土纳米复合材料的熔融挤出制备及表征

为了研究尼龙6／粘土纳米复合材料制备和结构，采用合适的改性剂对粘土进行有机改性，改性后的有有机土与尼龙按一定比例在具有反螺旋段的双螺杆挤出机中熔融复合。TEM测试结果表明：大多数粘土以单层层均匀分解于基体中（即使有少数以多晶层出现，厚度大约20nm），形成纳米复合材料。