三区带模拟移动床分离邻香兰素与香兰素

建立了同步及异步的三区带模拟移动床(SMB)分离邻香兰素和香兰素的数学模型,并通过实验成功实现了二者的高纯度、高效率分离.首先确定了SMB系统的流动相为V(乙醇)∶V(水)=35∶65,固定相为反相C18硅胶.通过单组分前沿分析法测定了邻香兰素和香兰素在反相C18制备柱上的吸附等温线,通过经验公式分别计算了二者的总传质系数与轴向扩散系数,依据线性驱动力模型建立了SMB及Varicol模型.限定邻香兰素和香兰素的纯度都高于99.5%,洗脱液流量为2.0mL/min,运用复合型法最大化进料流量,之后对优化结果进行实验验证.优化得到SMB分离系统的最大处理量为0.481mL/min,在此优化条件下实验得到邻香兰素和香兰素的纯度分别为99.3%和99.0%;优化得到Varicol分离系统最大处理量为0.551mL/min,与SMB系统相比提高了14.6%,实验得到邻香兰素和香兰素的纯度分别为99.2%和99.1%.     

邻香兰素分子模板聚合物结合作用及选择性研究

 以邻香兰素为烙印分子,α-甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,采用分子烙印技术合成了1类新的分子烙印聚合物.研究了它们的吸附特性及选择性识别能力.结果表明,与组成相同的非模板聚合物相比,模板聚合物有一定的吸附性能和选择性.     

丁香酚制备香兰素研究进展

香兰素是世界上产量最大、应用最广泛的香料之一.随着石油资源的消耗和枯竭,使用可再生资源丁香酚制备香兰素具有重要的意义.介绍了目前国内外利用丁香酚制备香兰素的方法,包括化学合成法和生物转化法,对其进行了评述,并对利用丁香酚制备香兰素的发展趋势进行了预测和展望.     

气相色谱法测定婴幼儿配方奶粉中香兰素和乙基香兰素

建立了婴幼儿配方奶粉中香兰素、乙基香兰素的气相色谱测定方法.利用香兰素在pH>6的环境中以离子形式存在的性质,排除牛奶中乳脂等成分的干扰,然后以乙醚为萃取剂提取样品中的香兰素和乙基香兰素.在0.05 mg/kg、0.1 mg/kg和0.5 mg/kg 3个水平的添加平均回收率为86.1%～96.8%,相对标准偏差为2....     

愈创木酚法合成香兰素研究进展

愈创木酚法合成香兰素的方法主要有亚硝基法、乙醛酸法、甲醛法、Reimer-Tiemann法、三氯乙醛法、电解氧化法,本文综述了愈创木酚法合成香兰素的研究进展,并对愈创木酚法合成香兰素提出了展望。     

婴幼儿乳制品中香兰素的检测方法研究

应用气相色谱(GC)技术建立了婴幼儿乳制品中香兰素和乙基香兰素的内标法定量分析方法.利用香兰素和乙基香兰素在碱性条件下以酚盐形式存在、在水相中溶解度大、酸性条件下以分子形式存在的特点,将样品在含有NaCl的NaOH溶液中适度加热使蛋白质变性后,直接用乙醚萃取,效果良好.对几个具有婴幼儿食品图样包装的市售乳制品中香兰素和...     

香兰素的合成新工艺

1 原理 香兰素又名3—甲氧基—4—羟基苯甲醛,既是一种重要香料,又是合成联苯双酯、利喘贝、哌唑嗪等药物的中间体。以愈创本酚为原料合成香兰素收率偏低。笔者以对甲酚为原料,通过氧化、单溴化、甲氧基化合成香兰素,取得了令人满意的结果。该工艺不仅可合成香兰素,还能合成乙基、丁基和异丙基香兰素。其合成反应如下:     

谷类食品中香料成分快速检测方法研究

对几种不同提取方法研究,发现超声波提取对谷类食品中香兰素和乙基香兰素有较高的提取率和准确度.用这种方法对香兰素和乙基香兰素进行定性定量分析,加标回收率均在92％～106％之间,RSD值在1.08％ ～ 3.87％之间,适用于婴幼儿谷类食品中香兰素和乙基香兰素的快速检测.     

SO42-/ZrO2型固体超强酸催化合成乙基香兰素1,2-丙二醇缩醛

以乙基香兰素和丙二醇为原料,SO_4~2-/ZrO2型固体超强酸为催化剂,合成了乙基香兰素1,2-丙二醇缩醛,考察了带水剂种类、催化剂用量、反应时间、原料摩尔比等对产率的影响.实验表明较优的反应条件为:乙基香兰素用量0.05 mol,n(乙基香兰素):n(1,2-丙二醇)=1:1.5,固体超强酸用量为乙基香兰素质量的1...     

化学计量学-紫外光度法同时测定食用香料四组分

香兰素、乙基香兰素、麦芽酚、乙基麦芽酚是重要的食品添加剂,经多年实验研究发现,大剂量使用香兰素等香料可以导致头痛、恶心、呕吐、呼吸困难,甚至能够损伤肝、肾,对人体有较大危害[1].因此,对食品中的香兰素、乙基香兰素、麦芽酚、乙基麦芽酚进行测定就显得非常重要.国内外测定这些香料的研究报道很少,主要有紫外光光度法[2]、高效液相色谱法[3]、电化学法[4]、流动注射-化学发光法[5],而多组分同时测定尚未见报道.本文采用化学计量学方法,对严重重叠的香兰素、乙基香兰素、麦芽酚和乙基麦芽酚紫外光谱进行解析,实现了不经分离直接测定该香料四组分.     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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