Tectonic types and evolution of Ordovician proto-type basins in the Tarim region

The Ordovician system is an important target for exploration in the Tarim Basin. Restoration of the Ordovician tectono-depositional environment is a key basis for the study of the structural development history in Tarim block and the prediction of the favorable Ordovician reservoir belts （zones）. Based on the surrounding tectonic settings, the litho-facies and sedimentary fill, the palaeo-geography, palaeoclimate and palaeo-ecology, and the structural deformation and magmatic eruptions, in this paper we combine the sedimentary fill in the basin with the development of the surrounding orogenic belts and re-build the proto-type basins of the different Ordovician periods. During the Ordovician period, the Tarim region was characterized by the composite of the interior cratonic depression with the peripheral cratonic depression. The interior cratonic depression in the central and western parts is mainly the deposiUonal area of the platform facies while the peripheral cratonic depression in the eastern part is mainly the zone of deepwater basin facies, with the slope acting as the transition belt between them. During the Late Ordovician period, the closure of the Northern Kunlun Ocean and destruction of the trench-arc-basin system in the Altyn Tagh region put the southern part of the Tarim block under com- pression and uplifting and turned the central and western parts of the carbonate platform into the mixed deposiUonal continental shelf. The eastern region of the basin had the over-compensated flysch sedimentation with huge thickness, marking the drastic turn of the basin nature. The basin tectonic framework turned to the south-north differentiation of the Silurian period from the east-west differentiation of the Ordovician period.     

Latent iron deficiency alters gamma-aminobutyric acid and glutamate metabolism in rat brain

Summary A diet containing 18–20 mg iron/kg to young weaned rats for 8 weeks altered the metabolism of gamma-aminobutyric acid and glutamate in the central nervous system without affecting blood hemoglobin. Subsequent rehabilitation with 390 mg iron/kg diet for 2 weeks normalized these changes.     

Melt Quality Evaluation of Ductile Iron by Pattern Recognition of Thermal Analysis Cooling Curves

The melt quality of ductile iron can be related to the melt's thermal analysis cooling curve. The freezing zone of the thermal analysis cooling curve was found to indicate the melt quality of the ductile iron. A comprehensive difference parameter, Ω, of the thermal analysis cooling curves was found to be related to the properties of ductile iron melts such as composition, temperature, and graphite morphology. As Ω ap- proached O, the thermal analysis cooling curves were found to come together with all the properties indicat- ing melt quality about the same. A database of thermal analysis cooling curves related to the properties of the ductile iron melts was set up as a basis for a method to accurately evaluate the melt quality of ductile iron by pattern recognition of thermal analysis cooling curves. The quality of a ductile iron melt can then be immediately determined by comparing its thermal analysis cooling curve freezing zone shape to those in the database.     

生命物质铁卟啉活性部位分子轨道的群论处理

用群论寻找可约表示特征标的规则，群论的对可约表示约化的公式，群论关于属于同一不可约表示的基才能对称性匹配组合分子轨道等方法，原理处理生命的关键物质铁卟啉活性部位的分子轨道，分析分子轨道能级与生化性质和电子光谱的关系。     

氨基酸螯合铁的研究及应用现状

对氨基酸螯合铁的吸收机制、吸收作用的特点、化学和生物化学制备方法及其在饲料、食品中的应用现状进行了综述,提出了目前氨基酸螯合铁研究及应用中存在的主要问题和今后发展的方向.     

纯铁液凝固过程的分子动力学模拟

为了研究纯铁熔液体系在凝固过程中的演变行为,采用分子动力学方法和带有范德瓦尔斯项的长程F-S势函数对液态Fe凝固过程的结构和能量演变进行模拟。径向分布函数、原子均方位移函数和Fe原子的聚集状态变化图像显示,凝固过程是Fe原子由无序向短程有序再向长程有序的变化过程,其中的短程有序结构可能是Fe原子组成的团簇结构;凝固过程中体系的总能量变化呈逐渐降低,Fe单质完美晶体的凝固温度约为2400 K。     

基于不同气候变化情景的东江流域水资源量预测研究

采用半分布式水文模型HSPF,结合1978-1998年东江流域实测气象数据和5个气候模式在3种RCP气候情景(RCP8.5,RCP4.5,RCP2.6)下基准期(1960-2000年)和未来时期(2020-2070年)降水、蒸发情景模拟结果,在对东江流域径流模拟检验基础上,对2020-2070年东江流域水资源量做了深入分析。结果表明,HSPF模型能很好模拟东江流域年、月径流以及洪水期径流变化,博罗站的NASH系数均超过0.81,PBIAS低于10%,RSR低于0.45;所选取气候模式能很好的反映研究流域气象数据在年内分布情况。对未来气候和东江流域水资源量模拟结果表明:1 2020-2070年不同气候变化情景下东江流域降水及蒸发量在RCP2.6和RCP4.5情景下均呈上升趋势,而在RCP8.5情景下,东江流域蒸发量则呈现下降趋势;2未来东江流域多年月均径流量呈增加趋势;3未来东江流域不同频率下的洪水和枯水流量均呈不同程度的增长。相对于基准期,未来时期的洪水天数呈增长趋势,洪水灾害有加剧态势。     

赤峰市平庄—元宝山盆地汉诺坝玄武岩的地球化学特征及其构造背景

对分布于赤峰东部平庄—元宝山盆地的汉诺坝玄武岩进行了岩石学、地球化学研究.结果表明,研究区内火山岩主要岩石类型为玄武岩及少量沉凝灰岩.玄武岩岩石成分较均一,主量元素变化不大,富钛、贫铝,富Na2O,低K2O.玄武岩稀土元素总量低,轻稀土元素富集,铕、铈异常不明显.玄武岩富集大离子亲石元素Rb,Ba,Th,K,Ta和LREE,高场强元素U相对亏损,相容元素Cr,Co,Ni含量较低.本区汉诺坝玄武岩属于拉斑玄武岩系列,火山岩的源区是软流圈上地幔,玄武岩形成于大陆裂谷的拉伸环境,是大陆板块内部稳定构造环境的产物.     

硼铁矿应用于高铬型钒钛矿烧结优化的实验研究

实验室条件下,研究了硼铁矿对高铬型钒钛矿烧结工艺及冶金性能的影响.研究表明:随着硼铁矿质量配比的升高,垂直烧结速度、成品率、转鼓指数、烧结杯利用系数、综合指标及低温还原粉化性能均呈先升高后降低的趋势,在硼铁矿质量配比为5.0%时,以上各指数均达到最高值,分别为28.84 mm·min-1,86.02%,61.2%,1.919 t·(m2·h)-1,363及90.76%,均优于未配加硼铁矿时的烧结矿性能.因此,烧结矿性能得以优化,可以为高炉冶炼提供更为优质的高铬型钒钛烧结矿.     

铁矿粉烧结液相流动性能的特征数方程的建立

为解决在研究铁矿粉烧结液相流动性能时通常只考虑面积增长率这一终点信息,而没有考虑过程信息的缺陷以及采用多个指标来表征流动性能在使用上的不便,对影响流动性的因素进行了分析,结合量纲分析和白金汉定理推导出了能定量表征流动性强弱的流动性特征数(LD),简化特征数方程后得到等效流动性特征数(LdΘ)。试验采用了可视卧式高温炉,记录了铁矿粉烧结液相流动的整个过程信息,通过基础实验和对照实验确定液相流动的起点和终点之后,可以得到每一种矿粉相应的等效流动性特征数数值。测量5种铁矿粉在两种方法下的流动性指标,当只考虑面积增长率时的流动性强弱顺序为AC≈DBE,新方法下为LdΘALdΘDLdΘC≈LdΘELdΘB,两种方法下的指标相近,但是综合了各种重要信息的新指标能进一步区分出各个因素对流动性能的影响程度。