快速气相色谱法测定食品中的六种常见防腐剂

建立了一种分离测定食品中6种常见防腐剂(山梨酸，苯甲酸，对羟基苯甲酸甲酯、对羟基苯甲酸乙酯、对羟基苯甲酸丙酯、对羟基苯甲酸丁酯)的简单、准确的快速气相色谱法，采用10m长，100μm内径的HP-5溶融石英毛细管柱，在快速程序升温条件下，六种常见防腐剂的分析时问为1．3min。各组分平均回收率(n=3)为96．45％；最低检测限为1．2-10μg／mL；线性相关系数大于0．994。     

分光光度法测定矿石中痕量铅

用双硫腙显色分光光度法测定铁矿石中痕量铅，该方法具有简单、快速、灵敏等特点，用以测定铁矿石中的痕量铅，获得了满意的结果．检出限为0．06μg／mL，线陛范围为0．01μg／mL～1．0μg／mLPb^2＋，相关系数为0．9996，回收率89％～99％．     

对羟基苯甲醛的GC分析方法研究

应用GC分析建立了对甲酚催化氧化法合成对羟基苯甲醛的主要产物及其副产物和反应液的分析方法，在色谱柱5％ SE-30，检测器为FID，柱温120～220℃，升温速率为8℃／min的条件下，由内标法定量，所得各组分的线性回归方程分别为：对羟基苯甲醛为y=0.0579x 0．4036，对羟基苯甲醚为y=0．0502x 0．4165，对甲酚为y=0．073x 0．3387;相关系数R^2分别为：0．9984，0.9885，0．9932；方法的最低检测限分别为：3．47μg／mL、1．68μg/mL、1．62μg／mL；CV％分别为0．13，0．16和0．08。探索一种针对此类反应进行的中控鉴测和产品的定量分析，以求建立决速、准确的分析方法。     

毛细管色谱法测定头孢美唑中的有机溶剂残留量

采用毛细管气相色谱法，以叔丁基甲醚为内标，用Agilent DB-200毛细管气相色谱柱和氢焰离子化检测器．同时测定了头孢美唑中甲醇、乙醇、二氯甲烷、三乙胺、乙酸乙酯、苯甲醚等6种有机溶剂残留量．6种溶剂的线性范围分别为0～480μg／mL（r=0．9996）、0—800μg／mL（r=0．9994）、0～96μg／mL（r=0．9990）、0～800μg/mL（r=0．9993）、0～800μg／mL（r=0．9995）、0～800μg／mL（r=0．9993）；平均回收率分别为100．1％、100．5％、101．2％、100．1％、100．7％和100．4％；相对标准偏差分别为0．90％、1．30％、1．18％、1．23％、1．52％、1．41％（n=9）．     

用比布列西猩红共振光散射技术测定蛋白质

在酸性溶液中，比布列西猩红与蛋白质作用，产生共振光散射(RLS)增强光谱，最大散射峰位于286．0nm，且增强RLS强度在一定范围内与蛋白质浓度呈线性关系．研究了pH、比布列西猩红的浓度及离子强度对RLS强度的影响．人血清白蛋白(HSA)的线性范围为0.02～4．0μg／mL，牛血清白蛋(BSA)0．02-4．5μg／mL，溶菌酶(Lys)为0．02-2．0μg／mL，γ-球蛋白(γ-IgG)为0.0l-7.5μg／mL.测定的检测限(3σ)分别为：16．6ng／mL(HSA)，15．7ng／mL(BSA)，16．7ng／mL(Lys)和7．5ng／mL(γ-IgG)．此方法用于人血清样品测定，结果满意．     

Ir(Ⅳ)-二甲基黄-高碘酸钾体系催化光度法测定痕量铱

在稀磷酸介质中，铱催化高碘酸钾氧化二甲基黄褪色，据此建立了测定痕量铱的新催化光度法。方法的线性范围为0．032～0．088μg／mL，检出限为7．54×10^-7μg／mL，对1．0μg／25mL Ir（Ⅳ）测定的相对标准偏差为1．5％（n=11）。这种方法简单、灵敏，已用于冶金产品中铱的测定，结果较好。     

毛细管气相色谱法测定酱腌菜中对羟基苯甲酸酯类防腐剂含量

应用毛细管气相色谱法在FID检测器上同时测定酱腌菜中2种对羟基苯甲酸酯类防腐剂.方法的线性范围10～200μg/mL,方法的检出限小于2μg/mL,测定的回收率大于90%,相对标准偏差小于3%.该方法可为酱腌菜制品中对羟基苯甲酸乙酯、对羟基苯甲酸丙酯毛细管气相色谱标准方法的建立提供参考.     

酸性高锰酸钾化学发光体系测定针剂中的头孢噻肟钠

头孢噻肟钠碱性水解产物与高锰酸钾反应可产生微弱的化学发光，多聚磷酸对其有强烈的增敏作用，据此建立了一种简单、快捷、灵敏的流动注射化学发光测定头孢噻肟钠的新方法．化学发光信号ICL与头孢噻肟钠质量浓度C在0．02-20μg／mL和20～120μg／mL范围内呈良好的线性关系，回归方程分别表示为ICL=3.169＋20．961C（r=0．9998，n=9）；ICL=147．5＋14．752C（r=0．9994，n=9），方法的检出限为20ng／mL．对5μg／mL头孢噻肟钠进行11次平行测定，相对标准偏差为0．8％，用本法对针剂中头孢噻肟钠的含量进行了测定，得出了令人满意的结果．     

腐乳中苯甲酸、山梨酸残留量的液相色谱测定

建立了腐乳中苯甲酸、山梨酸残留量的检验方法。研究了腐乳样品的净化方法，选择合适的沉淀剂使腐乳凝结。再调节清液的pH值，在碱性条件下用乙醚萃取去除杂质，在酸性条件下，用乙醚提取苯甲酸、山梨酸残留。苯甲酸和山梨酸在1．0～20μg/mL范围内，相关系数分别为γ=0．9991和γ=0．9993(n=6)。最低定量限(LOQ)均为2．0mg／kg。标准添加回收率均大于85％，相对标准偏差均小于4．64％。     

反相高效液相色谱法测定消毒剂中三氯羟基二苯醚

本用HPLC法对消毒剂中三氯羟基二苯醚含量进行测定，样品经80％甲醇水溶液稀释，用ODS C18柱进行分离，以甲醇：水(80：20)为流动相，紫外280nm检测，回收率在98％～102％，相对标准偏差(CV)为0．47％，最低检出浓度为7．0mg／kg，线性范围为5～200μg/mL，相关系数为0．999。     

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

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.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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.     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.