甘氨酸的荷移分光光度法测定

文章用分光光度法研究了甘氨酸与四氯苯醌 ( TCBQ)的荷移反应 ,确定在 p H=9.0的硼砂缓冲溶液中 ,于 5 0℃水浴中恒温 60 min,可获得 1∶ 1的络合物 ,其λmax=35 0 nm,表观摩尔吸光系数 ε=1 .98× 1 0 4 L· mo L- 1· cm- 1线性范围为 0～ 2 .7× 1 0 - 5mo L/L.应用拟定的方法测定了甘氨酸制剂的含量 ,结果与文献方法一致 ,回收率为 95 .0 %～ 1 0 4 .2 %相对标准偏差为 0 .79% .     

亚苄基海因水解制备苯丙酮酸过程的色-质联用分析

针对亚苄基海因水解体系建立了一种高效实用的液相色谱分析方法,为生产工艺控制提供了依据,并应用液-质联用技术对此体系中的未知副产物进行了初步检测.具体液相色谱条件为流动相乙腈-5 mmol·L-1乙酸盐缓冲液(用醋酸调pH4.5),流速0.5 mL·L-1;梯度洗脱;色谱柱Agilent Eclipse XDB-C8,5 μm,4.6×150 mm,20 ℃;二极管阵列检测器,检测波长204 nm.色-质联用中质谱条件为ESI离子源,负离子模式;气帘气流量1.03×105 Pa,电喷雾电压-4 200 V,离子源温度500 ℃,辅助雾化气1.37×105 Pa,干燥气4.13×105 Pa,相对分子质量检测范围m/z 40～600.液相色谱法测定亚苄基海因和苯丙酮酸的线性相关系数为0.999 05和0.999 86,亚苄基海因和苯丙酮酸的平均回收率为101.45 %和97.23 %,相对标准偏差为1.002%和0.833 8%.精密度以相对标准偏差来表示,分别为0.591 9 % 和0.648 2 %.结果表明,该液相色谱分析方法简便、快速,结果准确,可以用于苯丙酮酸生产的质量控制.     

芳香族亚砜缓蚀剂对碳钢的腐蚀抑制作用

按照有机结构-吸附现象-腐蚀性能的线性关系设计合成了几种芳香族亚砜化合物,采用正交设计法添加KI等配制成相应缓蚀剂,并用失重法评价了它们在H2SO4体系中的缓蚀作用.实验结果表明,芳香亚砜化合物在1 mol·L-1硫酸介质中对20号碳钢的腐蚀率符合Hammett方程式lgη=-0.196σ+1.86.在浓度相同的化合物为主体的缓蚀剂中,二对胺基苄基亚砜缓蚀效率最高,且缓蚀率由大到小的顺序为二对胺基苄基亚砜→二对甲氧基苄基亚砜→二对甲基苄基亚砜→二苄基亚砜;二对胺基苄基亚砜主体缓蚀剂在1 mol·L-1硫酸介质中对20号碳钢的腐蚀率为0.28×10-3 kg·m-2·h-1,二对胺基苄基亚砜与I-具有较好的协同效应.     

量热法研究氯化钆与甘氨酸配位反应的热化学性质

应用具有恒温环境的反应量热计,分别测定了[GdCl3·6H2O(s)+3Gly(s)](Gly代表甘氨酸)和配合物Gd(Gly)3Cl3·3H2O(s)在2mol·L-1HCl溶液中的溶解焓.根据盖斯定律设计一个热化学循环,可计算得到六水氯化钆和甘氨酸配位反应的反应焓ΔrHmθ(298.15K)=-9.471kJ·mol-1,并估算出配合物Gd(Gly)3Cl3·3H2O(s)在298.15K时的标准生成焓ΔfHmθ(298.15K)=-3629.67kJ·mol-1.     

邻羟基苄基氨乙酸及其配合物的研究(VII)——三价钴配合物的合成、性质及结构

在氨-氯化铵水溶液中,以氯化钴(Ⅱ),HBG(邻羟基苄基氮乙酸)为原料,经配位取代、氧化反应得到了Co(Ⅲ)的配合物,即氯化二[二邻羟基苄基氨乙酸合钴(Ⅲ)酸]·六氨合钴(Ⅲ)·七水盐,其分子式为[Co(NH_3)_6]·[Co(OC_6H_4CH_2NHCH_2COO)_2]_2,·Cl·7H_2O。进行了元素分析、摩尔电导、磁性、热谱测定,红外及紫外可见光谱的表征。培养得到了单晶,并用X射线分析测定它的晶体结构,其中配位阴离子CoL_2~-的配位环境是一个微变形的八面体。     

量热法测定氯化镱与甘氨酸配合物的标准生成焓

应用具恒温环境的反应热量计 ,分别测定了 [Yb Cl3· 6H2 O(s) +3 Gly(s) (Gly代表甘氨酸 ) ]和配合物 Yb(Gly) 3Cl3· 3 H2 O(s)在 2 mol· L- 1 HCl溶液中的溶解焓 .通过盖斯定律所设计的一个热化学循环 ,可计算得到六水氯化镱与甘氨酸配位反应的反应焓Δr Hmθ(2 98.1 5 K) =1 .0 73 k J· mol- 1 ,并估算出配合物 Yb(Gly) 3Cl3· 3 H2 O的标准生成焓Δf Hmθ(2 98.1 5 K) =-3 5 99.1 3 k J· mol- 1 .     

一种新型端氨基环磷腈衍生物的合成

以六氯环三磷腈为前体制备了六甘氨酸乙酯取代环三磷腈,然后采用氨基-酯交换法以双氨基化合物乙二胺直接与六甘氨酸乙酯取代环三磷腈反应合成了端氨基环磷腈衍生物。化合物六甘氨酸乙酯取代环三磷腈和端氨基环磷腈衍生物的结构经IR、¹H-NMR和质谱表征。讨论了反应温度、反应时间和投料比对端氨基环磷腈衍生物合成反应的影响,以及六甘氨酸乙酯取代环三磷腈和端氨基环磷腈衍生物后处理过程。该合成方法的反应条件温和,操作简单且收率高达95%。     

铅、镉-卟啉配合物的研究及其分析应用

研究了卟啉与铅、镉的反应及其相应配合物的电子吸收光谱。并结合巯基棉富集分离方法 ,将该具有特定光学性质的分析体系成功地应用于中药中痕量铅、镉的测定 .方法简便 ,测定体系抗干扰的效果好 ,灵敏度高 .对Pb(Ⅱ )、Cd(Ⅱ )的摩尔吸光系数分别为 2 .5× 10 5L·mol- 1·cm- 1和 5 .1× 10 5L·mol- 1·cm- 1.实际样品测定的RSD在 3.3%～ 13.0 %之间 .样品加标回收率在 85 %～ 110 %之间     

黄河表层沉积物和镉离子相互作用的离子交换率E(%)-pH曲线的研究

研究了黄河水中表层沉积物与镉液 -固界面相互作用的离子交换率E(% ) -pH曲线 ,以及河水中甘氨酸的存在对该曲线的影响 .实验结果表明 :1)镉是以Cd(OH) 形式在沉积物表面进行阳离子交换反应 .pH值是控制Cd 向固相迁移的主要因素 ,离子交换率E(% )随pH升高而增大 ,且在天然河水 pH为 8.0～ 8.5下接近最大值 ;2 )镉离子浓度由8.9× 10 - 7mol·L- 1 增大到 3× 8.9× 10 - 6mol·L- 1 时 ,离子交换率降低 ;3)河水中有2 .7× 10 - 6 mol·L- 1 甘氨酸存在时 ,会提高离子交换率 ;4 )转化沙和未转化沙分别对镉的吸附作用不同 ,后者大于前者 ,与理论推断相一致 .     

两种贵金属萃取剂萃取性能的研究

以N ,N二苄基甘氨酸和N ,N二苯基甘氨酸为固定相 ,以不同浓度的盐酸和高氯酸为展开剂 ,研究了它们对 8种贵金属的萃取行为 .实验表明 :N ,N二苯基甘氨酸的萃取能力较N ,N二苄基甘氨酸大 ;两种萃取剂在盐酸体系中的萃取能力比在高氯酸体系中大 .     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with