氮肥种类与旌量对油菜种子生育酚的影响

研究目的：创新要点：研究方法：重要结论：生育酚是菜籽重要的品质指标,氮肥是影响作物生物学与籽粒产量最常用的肥料。这项研究旨在搞清楚氮肥种类与施量对油菜种子生育酚含量与组分的确切影响,以及这种影响在基因型之间的差异。这篇论文研究了不同的氮肥种类（硝态氮与铵态氮）与低、中、高施用量对种子生育酚总量与组分的影响,并分析了其中的原因,为通过合理的氮肥施用方案配置,以达到最理想的菜籽生育酚含量或组分提供依据。采用盆钵实验控制氮肥施量与流失的精准方法,五种基因型、二种氮肥种类、三档施量水平,三重复控制误差;尝试用气相色谱法检测菜籽生育酚含量的新方法。尿素比硝酸氨更有利于菜籽总生育酚、阿尔法生育酚及伽马生育酚的有效形成;提高氮肥施量对于菜籽形成高含量的总生育酚与伽马生育酚非常有效,但对提高菜籽阿尔法生育酚含量的效果却不太明显。     

各向异性永磁锶铁氧体的晶粒取向与磁性

用SEM、TEM和磁性测量等手段分析了各向异性烧结SrFe12O19的晶粒取向对宏观磁性能的影响.结果表明,锶铁氧体磁粉中有废磁体经破碎、球磨后成粉状的SrFe12O19针状颗粒,沿C轴方向整齐排列,对产品质量无害.烧结SrFe12O19磁体中,颗粒呈六角型,其取向度越高,磁性越好.取向磁场的大小和添加剂的加入量对SrFe12O19磁体的取向度和磁性有着显著的影响.     

An in-situ DRIFTS study in the reaction between NO_x and soot on BaAl_2O_4

The interactions between NO, O2 and their mixture on BaAl2O4, as well as the reaction of NOx with soot in the presence of O2, have been investigated using Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). NO adsorption produces only nitrites species in the absence of O2. NO2 ad- sorption produces nitrates species besides nitrites species. The produced nitrites will further react with O2, O-su rf and O l2-att ice to form nitrates. The reaction of NOx with soot begins with the reaction of ni- trates with soot oxygenated complex (C(O)), which is regarded as the key and rate determining step. A reaction pathway is proposed for the catalyzed reaction of NOx with soot in the presence of O2.     

对溴苯基咪唑二羧酸构筑的锶配聚物的合成、晶体结构及性能

采用溶剂热法合成了锶的配聚物[Sr2 （p-BrPhHIDC）2（H2O）2]n（p-BrPhH3IDC=2-（对溴）苯基-4,5-咪唑二羧酸）,进行了元素分析、红外光谱的表征,X射线单晶衍射结果表明它是一个二维的固态结构.采用TGA进行了配合物在空气气氛下的失重分析,发现在212.6℃以后,首先失重4.19％,说明配合物在212.6℃内是热稳定的.采用荧光光度法研究了其固态荧光性能,发现在325 nm处产生有发射光谱,原因是金属锶离子与有机配体形成配聚物增大了刚性所致.     

单斜相SrAl2Si2O8陶瓷的烧结及其对Sr的固化

Monoclinic SrAl₂Si₂O₈ ceramics for Sr immobilization were prepared by a liquid-phase sintering method. The sintering temperature, mineral phase composition, microstructure, flexural strength, bulk density, and Sr ion leaching characteristics of the SrAl₂Si₂O₈ ceramics were investigated. A crystalline monoclinic SrAl₂Si₂O₈ phase formed through liquid-phase sintering at 1223 K. The introduction of four flux agents (B₂O₃, CaO·2B₂O₃, SrO·2B₂O₃, and BaO·2B₂O₃) to the SrAl₂Si₂O₈ ceramics not only reduced the densification temperature and decreased the volatilization of Sr during high-temperature sintering but also impacted the mechanical properties of the ceramics. Product consistency tests showed that the leaching concentration of Sr ions in the sample with flux agent B₂O₃ was the lowest, whereas that of Sr ions in the sample with flux agent BaO·2B₂O₃ was the highest. These results show that the leaching concentration of Sr ions depends largely on the amorphous phase in the ceramics. Meanwhile, the formation of mineral analog ceramics containing Sr is an important factor to improve Sr immobilization.     

Strontium isotopic signature of hydrothermal sedimentation from Early Cambrian barite deposits in east Guizhou,China

The ore genesis model for barite deposits in east Guizhou Province has been in dispute and the major debate focuses on whether they are product of the submarine hydrothermal sedimentation. This note presents new strontium isotope data from 19 samples of Dahebian and Yuping barite deposits, and their ^87Sr/^86Sr ratios are significantly lower than that of the coeval seawater. The ^87Sr/^86Sr ratios of 17 samples out of 19 samples rang from 0.708310 to 0.708967, indicating that they might be related to the mantel admixture. Two isotopic ratios in this study are higher than those of coeval seawater (0.7090), collected from late-stage barite mineral vein of interpenetrative strata and a barite nodule bearing hypidiomorphic granular pyrite, which indicates that they might be related to the continental admixture. The study provides Sr isotopic evidence not only for the submarine hydrothermal exhalative genesis of Dahebian and Yuping barite deposits, but also for distinguishing the barite mineralization of late stage.     

锶同位素研究在古季风演化研究中的应用研究

自从Rb-Sr同位素体系被应用于地质年龄以来,随着Rb-Sr同位素地球化学理论和测试分析技术的逐步发展和完善,其应用越来越广泛。主要介绍了锶同位素的基本地球化学特征,分析了锶同位素研究进行全球对比的可能性,探讨了锶同位素研究在我国黄土季风演化研究中的应用。众多研究显示Rb/Sr和87Sr/86Sr的比值变化受控于风化成壤作用的强弱,与降雨量、磁化率变化有很好的线性相关关系。通过曲线的分析、对比发现Rb/Sr和87Sr/86Sr曲线所蕴含的气候信息比磁化率曲线更为丰富和详细,与SPECMAP     

锶胁迫条件下生菜光谱效应特征

锶（Sr）胁迫条件下生菜的反射光谱特征会发生明显改变。通过室内生菜水培试验，获取了36个不同生长期、6个不同锶浓度胁迫的生菜叶片400～950 nm波段区间的生化参数信息（叶绿素含量、细胞结构、叶片金属含量）和反射光谱信息，利用光谱技术并结合数学统计方法研究了生菜叶片7个光谱特征参数与实测叶片锶元素含量之间的相关性，优选了较敏感光谱特征参数，建立了其与生菜叶片锶含量的线性回归模型。结果表明，锶胁迫生菜叶片叶绿素含量呈先上升后下降的规律，细胞结构差异不明显。锶胁迫生菜叶片反射光谱直观上无规律，通过采用光谱技术方法分析得出锶胁迫生菜叶片的红边波段位置先“红移”再“蓝移”，红谷波段位置则“红移”，植被指数B4/B3比值先升高后降低，红边归一化植被指数（NDVI）值随着锶浓度的升高而降低。相关性及线性回归模型分析表明红边波段位置与叶片锶含量显著相关。本文为下一步基于光谱特征的叶片重金属含量反演模型的构建提供了较好的数据源和基础理论。