分光光度法测定食用植物油中的总黄酮含量

建立了食用植物油样品皂化后显色-分光光度法测定总黄酮含量的方法。样品在80℃水浴条件下用氢氧化钾-乙醇溶液皂化后直接以亚硝酸钠-硝酸铝溶液显色,选择353 nm波长用分光光度法测定吸光度。以芦丁为标样,用测定过含量的脱色油样制备标准溶液,显色后测定标准曲线。实验显示,测定大豆油样品的日内精密度相对标准偏差(RSD)为0.82%,日间精密度RSD为1.8%。食用油中的抗氧化剂、甾醇、多酚类成分对本法没有干扰。加标回收率99.1%±0.7%。用于实际样品测定市售大豆油样品中总黄酮含量为10.1 mg/L,大豆油样品中总黄酮含量为13.1 mg/L。通过对样品皂化处理,避免了实验过程中的乳化现象,精密度较好且操作简便。可用于植物油中总黄酮的测定。     

UV固化环氧大豆油丙烯酸酯的合成及反应物物料比对其性能的影响研究

以环氧大豆油(ESO)为原料,丙烯酸为开环试剂,在催化剂三苯基膦的作用下以不同配比的环氧大豆油和丙烯酸合成一系列环氧大豆油丙烯酸酯(AESO)低聚物,并在紫外光照射下固化成膜.采用傅里叶红外光谱(FT-IR)对环氧大豆油丙烯酸酯低聚物进行结构表征.利用热重分析(TGA)对环氧大豆油丙烯酸酯的热性能进行测试,结果显示丙烯酸含量的提高会导致固化膜热分解温度降低.通过拉力测试研究不同配比固化膜的拉伸性能的变化,发现丙烯酸含量的变化,对固化膜拉伸性能影响显著.通过铅笔硬度、涂膜附着力及冲击强度测试研究了固化膜的其他力学性能,结果表明,随着丙烯酸含量的增加,固化膜相应的力学性能都明显提高.     

紫外光固化环氧大豆油树脂的合成和表征

研究了可作为紫外光固化涂料和油墨等产品的基体树脂的改性环氧大豆油树脂的合成及表征.利用环氧大豆油的环氧环的化学活性,先后与丙烯酸和马来酸酐进行反应,分别合成了油溶性环氧大豆油丙烯酸酯(AESO)和水溶性的马来酸改性环氧大豆油树脂(MAESO).并用红外和核磁对两种产物的结构进行了表征.添加紫外光引发剂后,两种产物在紫外光照射下均可快速固化.合成AESO最佳条件为环氧大豆油:丙烯酸=1.2:1(摩尔比),催化剂三苯基膦的用量为总质量的1%,反应温度为120℃;合成MAESO最佳条件为AESO:马来酸酐=4:1(摩尔比),催化剂钛酸正丁酯用量为1%,反应温度90℃.     

大豆油的环氧化反应宏观动力学研究

通过对环氧大豆油制备的小试和中试实验 ,给出了大豆油环氧化反应的最佳工艺条件 ,宏观动力学关系公式 :rEO =d(EO) dt=0 0 752 .得出大豆油环氧化反应在该条件下为传质控制的结论     

α-淀粉酶协同超声波法提取复方半边莲注射液工艺优化

在超声波条件固定的情况下,采用正交试验设计,运用α-淀粉酶提取复方半边莲注射液指标成分野黄芩苷,以HPLC方法检测野黄芩苷含量.最佳工艺条件为:酶解时间30 min,pH6.0,酶解温度30℃,酶用量0.5 g.在此优化条件下,提取复方半边莲注射液的野黄芩苷含量为4.45 g/L,明显大于复方半边莲注射液注册标准煎煮法野黄芩苷的含量1.34 g/L、单一超声法3.84 g/L、单一α-淀粉酶法1.89 g/L.     

大豆油基聚氨酯丙烯酸酯的制备及应用研究

以大豆油为原料,采用过氧甲酸氧化法制备不同环氧值的环氧大豆油(ESO),然后用冰乙酸开环环氧大豆油,得到不同羟基数的大豆油基多元醇(ESOP),再与丙烯酸羟乙酯单封端的异佛尔酮二异氰酸酯反应,制备不同官能度的大豆油基UV树脂,采用~1H NMR、FT-IR对产物结构进行表征.经紫外光照射,制得一系列UV固化膜.使用扫描电镜(SEM)、应力-应变、凝胶含量、吸水率、铅笔硬度、热重(TG)等测试这一系列固化膜的力学性能、物理性能和热稳定性能.结果表明:随着UV树脂的官能度的增加,对应的UV固化膜的凝胶含量、铅笔硬度、拉伸强度和弹性模量逐渐增加,而吸水率却呈现降低趋势,热稳定性能变化不明显.     

大豆油基UV树脂的制备及应用研究

以自制的环氧大豆油(ESO)为原料,合成丙烯酸化环氧大豆油(AESO),分别用马来酸酸酐和丙烯酸羟乙酯(HAM)半封端的异佛尔酮二异氰酸酯(IPDI)接枝AESO,得到两种可UV固化的大豆油基低聚物MAESO和HAESO,并用红外(FT-IR)对中间产物进行表征.在两种大豆油基低聚物中分别加入质量分数分别为20%的1,6-己二醇二甲基丙烯酸酯和3%的IRG-184,然后涂抹在马口铁片和和聚四氟乙烯板上,进行UV固化.通过应力-应变测试、冲击强度试验、热重分析(TG)、扫描电镜(SEM)、凝胶含量、吸水率、附着力、铅笔硬度和光泽度等手段对膜的性能进行测试.结果表明,用马来酸酐接枝的丙烯酸化环氧大豆油做成的UV固化膜的综合性能比较好.     

大鼠高脂血症建模的改进方法

目的:改进大鼠高脂血症模型的建立方法。方法对脂肪乳处方及配制方法进行改进,采用脂肪乳灌胃建立大鼠高脂血症模型,用酶比色法测定模型组与正常组血清总胆固醇(TC)、甘油三脂(TG)含量。结果模型组大鼠死亡率低,与正常组相比较,TC和TG具有显著差异。结论本造模方法成功率高,切实可行。     

奥硝唑注射液与木糖醇注射液配伍的稳定性实验

目的探讨在不同温度(25℃、37℃)下奥硝唑注射液与木糖醇注射液配伍稳定性.方法将临床用药量的奥硝唑注射液加到临床用药量的木糖醇注射液中,在不同温度下放置,0～8h内观察外观、测定混合液pH值、紫外分光度法测定混合液中奥硝唑的含量.结果在25℃与37℃条件下放置8h内,两种注射液配伍后的溶液的外观、pH值、奥硝唑的含量均无明显变化,结论奥硝唑注射液与木糖醇注射液可以配伍,在8h内配伍液性质稳定.     

腌制条件对小白菜中硝酸盐和亚硝酸盐含量的研究

研究不同腌制条件下的小白菜中硝酸盐和亚硝酸盐的含量,结果表明小白菜中硝酸盐和亚硝酸盐含量在不同盐度和贮藏条件下变化明显.硝酸盐和亚硝酸盐含量由低到高变化的腌制盐添加量依次为70 g/kg100 g/kg20g/kg50 g/kg;亚硝酸盐含量由低到高变化的贮藏条件为冷冻(-20℃)室温(20℃)保鲜(4℃),而硝酸盐在保鲜(4℃)下较高,冷冻(-20℃)和室温(20℃)条件下无差异.但是在不同p H腌制条件下硝酸盐和亚硝酸盐含量变化均不明显.因此,在腌制小白菜时,加入70 g/kg的食用盐和冷冻(-20℃)条件下保存,这样腌制出来的小白菜硝酸盐和亚硝酸盐的含量都相对偏低,食用更安全.     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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

正~~