矿物掺合料对页岩陶粒混凝土抗压强度的影响

以页岩陶粒混凝土为基础配方,系统研究了单掺和双掺不同含量的偏高岭土、粉煤灰、钢渣等矿物掺合料对其抗压强度影响,通过SEM和XRD进行了相关的微观结构和组成分析.结果表明当单掺矿物掺和料质量分数为10%时,页岩陶粒混凝土达到最高的抗压强度;双掺和时,总掺量为10%(质量分数)、比例为1∶2的偏高岭土和粉煤灰时,页岩陶粒混凝土的抗压强度最好,其3d、7d和28d的抗压强度分别达到了18.1、28.6和35MPa,对比没有加入矿物掺合料的页岩陶粒混凝土的抗压强度分别增加了417%、267%和250%,主要原因是偏高岭土和粉煤灰的掺加能够优化轻骨料混凝土的微观结构,对强度具有较大贡献.     

页岩气水平井地质信息解析与三维构造建模

页岩气开发具有开发评价期短,评价井少（直井）的特点,直井密度低增加了储层精细描述和地质建模的技术难度。因此,建立研究区地层的岩性、物性和电性特征的定量识别标准,利用该标准对水平井水平段开展精细小层划分,并对实际钻遇地层厚度进行校正,将水平井水平段等效为多口平面分布的直井。在此基础上,以水平井段解析的各小层数据资料作为控制点,建立研究区精细构造模型。水平井多点地质信息解析,将水平段等效为多口评价井获取相关地质参数资料,可有效地弥补评价井资料少的不足。     

大兴安岭中段哈达陶勒盖组火山岩U-Pb定年及成因

为了研究大兴安岭中段哈达陶勒盖组火山岩的形成时代和岩石成因,进行了锆石U-Pb同位素年龄测试和地球化学研究.LA-ICP-MS锆石U-Pb定年结果显示,哈达陶勒盖组火山岩形成于234~244Ma的中三叠世.岩石地球化学研究表明,哈达陶勒盖组火山岩具有低硅富碱、富钙镁的特征;稀土丰度总量w(∑RE)= 122.32×10^-6~140.66×10^-6,轻、重稀土分馏较明显,m(La)/m (Yb)_N=11.99~18.68, 无明显Eu负异常(δ_○Eu=0.84~0.98),微量元素以富集Rb,K,Ba,Th,亏损Nb,P,Ti为特征.哈达陶勒盖组火山岩岩浆源区为富集的岩石圈地幔, 并遭受了地壳物质的混染.     

页岩纹层与破裂方式实验研究

页岩纹层发育,微观非均质性强,页岩破裂方式受多种因素控制。以川南地区X101井龙马溪组深层页岩为研究对象,利用岩芯、薄片、测井资料、X-射线衍射与CT扫描等手段,结合单轴压缩与常规三轴压缩实验,系统研究了页岩破裂方式与纹层产状、矿物组成的关系。结果表明,主压应力垂直纹层方向的单轴压缩岩样形成张拉劈裂破坏,产生80°左右的垂直缝;三轴压缩实验中,主压应力垂直于纹层的岩样形成剪切破坏,裂缝与纹层以45°～65°高角度斜交,主压应力与纹层45°斜交的岩样以沿纹层面的剪切滑移破坏为主,主压应力平行纹层的岩样产生共轭剪切破坏,两者形成的裂缝与纹层呈10°～45°低角度斜交。对于不同纹层倾角的岩样,杨氏模量均与石英含量呈显著正相关,与黏土矿物呈显著负相关的关系,抗压强度与石英、黏土矿物含量的相关性受不同纹层倾角的影响。硅质纹层发育单层厚度大将增强页岩力学性质。     

四川某金矿中非金属单矿物的元素分析及意义

利用中子活化分析法对四川某地区的非金属单矿物(热液脉矿物)的元素进行了测试,并利用元素地球化学研究方法对元素间的相关关系进行了分析。结果表明,在该地区可以利用元素间的伴生关系指导找矿。     

利骨素抗去卵巢大鼠骨矿物元素代谢紊乱的作用机制

通过测定骨元素含量和血清相关激素及白细胞介素-6水平,探讨了利骨素对去卵巢大鼠骨元素代谢的影响及其机制。将健康4月龄雌性SD大鼠24只随机分成3组:A组,假去卵巢组;B组,去卵巢组;C组,去卵巢+利骨素组。结果表明,去卵巢大鼠骨Ca、Mg、S、Mn、Zn等含量显著降低,P含量显著增加;应用利骨素可使去卵巢大鼠降低的骨Ca、Mg、S、Mn、Zn等含量显著回升,P含量显著回降。血清相关激素:去卵巢组较假去卵巢组大鼠,血清雌二醇(E2)、孕酮(P)、促甲状腺激素(TSH)、甲状腺素(T4)、降钙素(CT)、皮质醇(Cortisol)、生长素(GH)等含量降低,卵泡刺激素(FSH)、黄体生成素(LH)、白细胞介素-6(IL-6)等含量升高;去卵巢+利骨素组较去卵巢组,血清P,GH,Cortisol,TSH,T4等含量回升,LH含量回降。提示利骨素改变去卵巢大鼠体内相关激素水平是其纠正去卵巢大鼠骨元素代谢紊乱作用的重要机制。     

双旋转附属圆柱对主圆柱尾流控制的影响

基于Fluent软件平台,采用数值模拟方法对非稳态圆柱体结构尾流流动特性进行了研究。对在Re=50～200范围内,双旋转附属圆柱的转速对主圆柱体尾流流动特性的影响进行了分析。研究结果表明:随着附属圆柱旋转速率的增加,主圆柱体表面所受阻力系数平均值与均方根值、升力系数均方根值均会减小。同时,旋转速率的变化对柱体结构表面压力分布的影响显著,压力系数在附属圆柱的位置产生了跳跃性变化。另外,当附属圆柱转速达到临界值时,尾流涡街变窄,涡脱落现象消失,并且系统的能量效率到达最佳状态。     

Nutritional Attributes and Phenolic Composition of Flower and Bud of Sophora japonica L. and Robinia pseudoacacia L.

Sophora japonica L. (SJL) and Robinia pseudoacacia L. (RPL) are widely cultivated in China. However, the utilization of their main by-products are limited due to a lack of comprehensive nutritional attributes. Herein, the proximate composition, mineral elements, fatty acids, amino acids, monosaccharides, and phenolics were analyzed to investigate the nutritional attributes of SJL and RPL. Dietary fiber was the main ingredient in SJL and RPL, followed by protein and lipids. The content of Fe in SJL and RPL was highest, especially in flowers of SJL, reaching about 1179.51 mg/kg. The total unsaturated fatty acids accounted for 89.67% of the bud of SJL. Meanwhile, the essential amino acids contents of the flower and bud of SJL and RPL accounted for 35.95–40.59% of total amino acids. The flower of SJL (373.75 mg/g) exhibited the most abundant monosaccharides. Meanwhile, the total phenolics and flavonoid contents in the buds of SJL and RPL were significantly higher than that of the flower, implying the buds possessed better biological activity. Moreover, the bud of SJL possessed the most abundant phenolics. The results provided a reference for the development of functional food derived from SJL and RPL.     

Alternative Ecosorbent for the Determination of Trihalomethanes in Aqueous Samples in SPME Mode

A new sorbent material based on modified clay with ionic liquid immobilized into an agarose film was developed as part of this study. It was applied to determine organochlorine pollutants, like disinfection byproducts, through headspace solid-phase microextraction-gas chromatography-electron capture detection (HS-SPME-GC-ECD). The disinfection byproducts determined in this study were used as model molecules because they were volatile compounds, with proven severe effects on human health. Their presence in aquatic environments is in trace concentrations (from pg L⁻¹ to mg L⁻¹). They are classified as emergent pollutants and their determination is a challenge for analytical chemists. The parameters which affected the extraction efficiency, i.e., number and distance between SPME discs, salt concentration, the temperature of extraction, extraction time, and desorption time, were optimized. A wide linear dynamic range of 10–1000 ng mL⁻¹ and coefficients of determination better than 0.997 were achieved. The limits of detection and the limits of quantitation were found in the ranges of (1.7–3.7) ng mL⁻¹ and (5.6–9.9) ng mL⁻¹, respectively. The precision, expressed as relative standard deviation (RSD), was better than 8%. The developed sorbent exhibits good adsorption affinity. The applicability of the proposed methodology for the analysis of trihalomethanes in environmental and water samples showed recoveries in the range of 86–95%. Finally, the newly created method fully complied with the principles of green chemistry. Due to the fact that the sorbent holder was made of agarose, which is a wholly biodegradable material, sorbent clay is a widespread material in nature. Moreover, the reagents intercalated into the montmorillonite are new green solvents, and during the whole procedure, low amounts of organic solvents were used.     

纤维与膨胀剂对大掺量矿物掺合料混凝土塑性收缩开裂的影响

采用平板限制收缩试验法,研究了聚丙烯纤维、钢纤维与膨胀荆及其复合技术对大掺量矿物掺合料混凝土早期塑性收缩开裂的影响。结果表明,大掺量矿物掺合料混凝土的早期抗裂性大小顺序为：纤维增强高性能膨胀混凝土〉纤维增强高性能混凝土〉混杂纤维增强高性能混凝土〉混杂纤维增强高性能膨胀混凝土〉高性能膨胀混凝土。因此,采用膨胀剂与钢纤雏的复合技术是防止混凝土发生塑性收缩开裂的比较理想的技术措施。