亚麻油中α-亚麻酸含量的测定研究

目的:建立高效液相色谱法测定亚麻油中α-亚麻酸含量的方法.方法:样品经甲酯化后用高效液相色谱法进行分析,色谱柱为AgiIent C18(4.6mm×150mm,5μm),流动相为甲醇-水(95∶5),流速1.0ml/min,检测波长210nm,柱温30℃.结果:α-亚麻酸在0.20～2.0μg范围内线性关系良好,回归方程为Y=51.73 154.71X,(r=0.999 8),加样平均回收率为99.66%,RSD为1.06%.结论:本法操作简便、准确、重现性好.     

阿司匹林软膏制备工艺及稳定性试验研究

目的:比较不同类型的基质对阿司匹林软膏稳定性的影响,确定基质类型和制备工艺.方法:采用对比研究的方法制备处方并进行稳定性试验.结果:阿司匹林软膏宜采用乳化法制备W/O型乳剂基质.结论:W/O型阿司匹林软膏稳定性好,制备工艺简单,方便易行.     

椒目仁油中α-亚麻酸的鉴定和含量测定研究

对椒目仁油的鉴定及有效成分测定方法进行研究,为药材及制剂标准的制定提供试验依据.采用薄层色谱法对椒目仁油中α-亚麻酸进行定性鉴别;用高效液相色谱法对其有效成分α-亚麻酸进行含量测定.结果是α-亚麻酸在(20～400) μg·mL -范围内呈良好线性关系.α-亚麻酸平均回收率为98.80％;5批椒目仁油中α-亚麻酸的平均含量为21.70％.为椒目仁油制剂标准的制订提供了参考.所建立的方法操作简便、准确可靠、重现性好,能有效控制椒目仁油的质量.     

近红外光谱法定量分析亚麻油中的主要组分

用厚度为 1cm的玻璃比色皿作为吸收池 ,测定了亚麻油的近红外光谱 ,利用 70 0 0～ 6 0 0 0cm-1范围内的透波率 ,建立了主成分回归分析模型和BP人工神经网络模型 ,用二模型预测了亚麻油中油酸、亚油酸和亚麻酸的含量 ,预测结果的平均相对误差均在 2 %以内 ,并BP人工神经网络模型预测的效果较好。该法可用于亚麻油中主要组分的实时成分分析。     

亚麻油微胶囊的制备研究

目的:制备亚麻油微胶囊,考察其影响因素,找出最优方案.方法:采用单凝聚法,以明胶为囊材制备亚麻油微胶囊,观察其形态、分析其粒径.结果:获得圆球形、平均粒径19μm,且分布较均匀的亚麻油微囊.意义:作为一种干性油,亚麻油微型胶囊可应用于汽车涂料中产生自愈效果,可开发汽车自愈涂料.     

亚麻油渣提取物制备工艺研究

采用单因素试验、正交试验法进行研究,以HPLC法对提取液中的木酚素含量进行测定,大孔吸附树脂从提取物中分离纯化亚麻木酚素,对亚麻油渣提取物的制备工艺进行了研究.结果显示:亚麻油渣的提取方法为回流提取,其工艺参数为加入16倍量70%乙醇,回流提取3次,每次1 h;分离纯化工艺参数为2 BV/h流速上样,6 BV的30%乙醇,3 BV/h洗脱.该工艺稳定可行,可作为亚麻油渣提取物的制备工艺.     

尿素包合法纯化α-亚麻酸方法的研究

以亚麻籽油为原料对尿素包合法纯化α-亚麻酸的工艺条件进行研究.采用单因素实验考察包合时间、包合温度、尿素与脂肪酸质量比、甲醇体积与尿素质量比对提取α-亚麻酸的影响,同时采用响应曲面法分析建立二次回归模型,对影响因素包合时间、尿素与脂肪酸质量比、甲醇体积与尿素质量比进行优化组合.以产物中α-亚麻酸质量浓度为指标,确定了尿素包合法提取α-亚麻酸的最佳工艺条件,即包合时间12.80 h,尿素与脂肪酸质量比为2.82,甲醇体积与尿素的质量比为2.44mL/g,该工艺制备α-亚麻酸质量浓度为179.96μg/mL.采用紫外光谱检测将样品与标准品进行对照,确定样品为α-亚麻酸.     

木鳖子种仁油的理化特性分析测定

对木鳖子种仁油的理化性质和脂肪酸组成进行了分析,结果表明木鳖子种仁油由7种脂肪酸组成,主要为由亚油酸、油酸、硬脂酸和α-亚麻酸,四者的含量占总脂肪酸含量的90%以上,其中α-亚麻酸含量相对较高。     

微生物油脂中多不饱和脂肪酸的富集研究

采用脲包法富集微生物油脂中的多不饱和脂肪酸 (亚油酸和γ -亚麻酸 ) .结果表明 :当混合脂肪酸∶尿素∶甲醇为 1∶3∶7.88时 ,富集效果最佳 ,微生物油脂中亚油酸和γ -亚麻酸的含量从 9.88%增加到 44 .79% ,其中γ -亚麻酸的含量从 2 .0 3%增加至 19.79% ,富集了将近 10倍     

热榨与冷榨对亚麻油风味物质的影响及风味特征成分分析

采用顶空固相微萃取和气相色谱-质谱联用技术检测热榨和冷榨工艺制得的亚麻油中的挥发性物质,对不同压榨工艺制得的亚麻油中的醇类、醛类、酮类等挥发性物质的含量及占总挥发性物质含量的比例进行探讨,并采用气味活度值(OAV)对不同压榨工艺下得到的亚麻油的关键性风味物质进行评价与确定.研究表明:热榨和冷榨工艺得到的亚麻油风味物质主要包括醇类、醛类、酮类、呋喃类、二甲基硫醚等;亚麻油的关键风味物质呈味次序依次为二甲基硫醚己醛丙醛2-丁醇1-己醇3-甲基-1-丁醇3-戊烯醇2-甲基丙醇2-甲基丁醇,其中二甲基硫醚和醛类物质在亚麻油整体风味中贡献率最大,醇类物质的贡献率最小,而酮类和呋喃类物质等由于其气味阈值较大,OAV较小,对亚麻油的整体风味无实际影响;热榨样品中二甲基硫醚及醛类物质的OAV远大于冷榨样品,因此,热榨亚麻油比冷榨亚麻油具有较浓的青草味或腥味.     

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