〈铕(Ⅲ)/HNO3/N7402HTTA }〉及〈钆(Ⅲ)/HNO3/N7402HTTA }〉协同萃取的体系

本文报导了HTTA和N₇₄₀₂混合萃取剂萃取铕(Ⅲ)和钆(Ⅲ)的协同效应。分别测定了HTTA与N₇₄₀₂单独萃取,以及HTTA和N₇₄₀₂混合萃取剂协同萃取的最佳条件以及铕(Ⅲ)与钆(Ⅲ)的分离因数,这两个元素的协萃合物为离子缔合物,其稳定性呈现\     

常用二元熔盐氯化物相图及其热力学性质的最优化

本文介绍了一种优化处理二元相图及热力学性质的方法。通过系统分析全部所获得的LiCl—KCl,LiCl—SrCl₂,NaCl—SrCl₂,NaCl—CaCl₂,NaCl—BaCl₂,KCl—BaCl₂,CaCl₂—BaCl₂,BaCl₂—SrCl₂等八个二元系热力学性质和相图的数据并进行优化处理,取得了热力学性质和相图自相一致的结果。     

岩体工程系统失稳的能量突变判断准则及其应用

在明确区分了岩五材料的破坏与岩石工程系统失稳破坏不同含义的基础上,提出了在用有限元计算模拟地下岩石开挖工程和实际工程设计中,不应简单地将岩石材料的破坏与岩石工程系统的破坏用同样的破坏准则加以判断的观点.运用系统能量的原理,借助突变理论的方法,导出了岩体工程开挖系统失稳破坏的能量突变准则,并将其引入有限元程序中,用以判断岩体工程系统失稳的可能性.通过对金川二矿区大面积龙矿柱胶结允填采场稳定性的有限元模拟分析,证明所提出观点和判断准则是正确的,只有一定的实用价值.     

岩石厚壁圆筒三向压缩下的卸荷试验与岩石强度破坏

为研究地下工程开挖影响,采用厚壁圆筒多轴应力试验,对试样施加较高的轴对称内、外壁压力及轴向荷载后,进行内、外壁卸荷破坏试验.试验的破坏结果是在厚壁圆筒壁间形成环向主要破裂面.这一破裂现象在以往相关文献中未见报道,与通常弹塑性理论分析的较高应力发生在圆筒内缘、破坏从内缘开始的结论不同.这一结果与深部矿山巷道围岩出现的分区破裂(zonal disintegration)现象类似.     

3.5%NaCl盐雾条件下Q235A-Z35钢的腐蚀行为研究

为了研究实船钢材在海洋大气环境下的腐蚀规律,在3.5%NaCl溶液环境中进行Q235A-Z35钢的盐雾腐蚀试验。通过宏观形貌观察、腐蚀失重分析、显微形貌观察、X射线衍射(XRD)物相分析以及腐蚀试样的电化学试验等方法研究了Q235A-Z35钢在盐雾腐蚀环境中的腐蚀行为。结果表明:在从0-96 h的腐蚀过程中其表面腐蚀产物的覆盖程度、致密程度都逐渐提高在短时间内的腐蚀条件下表面腐蚀产物以γ-FeOOH为主,而随着腐蚀时间的增加,腐蚀产物逐渐由疏松多孔的层絮状γ-FeOOH转变为致密的团状和块状的β-FeOOH和α-FeOOH;表面产生的腐蚀产物γ-FeOOH会促进钢的腐蚀,β-FeOOH和α-FeOOH能够抑制钢的腐蚀,并对钢材基体有一定的保护作用。     

Effect of Overexpression of γ-Tocopherol Methyltransferase on α-Tocopherol and Fatty Acid Accumulation and Tolerance to Salt Stress during Seed Germination in Brassica napus L.

Rapeseed (Brassica napus L.) is an important oil crop and a major source of tocopherols, also known as vitamin E, in human nutrition. Enhancing the quality and composition of fatty acids (FAs) and tocopherols in seeds has long been a target for rapeseed breeding. The gene γ-Tocopherol methyltransferase (γ-TMT) encodes an enzyme catalysing the conversion of γ-tocopherol to α-tocopherol, which has the highest biological activity. However, the genetic basis of γ-TMT in B. napus seeds remains unclear. In the present study, BnaC02.TMT.a, one paralogue of Brassica napus γ-TMT, was isolated from the B. napus cultivar “Zhongshuang11” by nested PCR, and two homozygous transgenic overexpression lines were further characterised. Our results demonstrated that the overexpression of BnaC02.TMT.a mediated an increase in the α- and total tocopherol content in transgenic B. napus seeds. Interestingly, the FA composition was also altered in the transgenic plants; a reduction in the levels of oleic acid and an increase in the levels of linoleic acid and linolenic acid were observed. Consistently, BnaC02.TMT.a promoted the expression of BnFAD2 and BnFAD3, which are involved in the biosynthesis of polyunsaturated fatty acids during seed development. In addition, BnaC02.TMT.a enhanced the tolerance to salt stress by scavenging reactive oxygen species (ROS) during seed germination in B. napus. Our results suggest that BnaC02.TMT.a could affect the tocopherol content and FA composition and play a positive role in regulating the rapeseed response to salt stress by modulating the ROS scavenging system. This study broadens our understanding of the function of the Bnγ-TMT gene and provides a novel strategy for genetic engineering in rapeseed breeding.     

综放仰斜开采顶板初跨规律及围巷稳定性研究

通过进行综放工作面仰斜开采顶板初跨规律及围巷稳定性研究,可合理指导回采工作面在初采老顶跨落期间的顶板管理以及合理确定风运两巷超前支护参数、排水巷与切眼间煤柱,为首采工作面围岩结构分析提供了新的思路和方法。     

中低品位磷矿和多种稀硫酸生产过磷酸钙的实践

根据目前磷矿质量下降、价格上涨、生产成本增加的情况,采取多种中低品位磷矿、多种稀硫酸生产过磷酸钙,对45%稀硫酸加热浓缩提到58%,并摸索出优惠的混化工艺条件、不同杂质含量的翻堆熟化条件,使生产成本大大降低,仅2008年1季度使用稀硫酸2874t(折纯),获经济效益86万元。     

电子舌技术在低钠盐配方检测评价中的应用

研究电子舌技术在低钠盐配方检测评价中的应用。利用伏安型电子舌对样品溶液进行数据采集,通过小波变换去除信号噪声;基于主成分分析和聚类分析对样品溶液进行分析评价;基于偏最小二乘法建立低钠盐配方的咸味得分预测模型。结果表明:小波变换能去除高频噪声,保留信号的有用成分;主成分分析和聚类分析能对样品进行区分分类,正确反映样品的亲疏关系;采用偏最小二乘法建立的咸味预测模型,建模集和预测集的RMSE分别为3.18%、1.75%,预测效果很好。研究结果为低钠盐配方品质评价提供了一种快速的检测方法。