荧光法测定片剂中抗坏血酸的含量

基于抗坏血酸（Vc）本身没有荧光,苯甲酸（BA）与Vc反应生成强荧光物质的特性,建立了一种荧光法测定vc含量的方法．在0．20mol·L^-1（pH=6．00）的Na（）HKHC8H4O4缓冲介质中,Vc能使BA体系的荧光明显增强,λex／λen=310nm／410nm．实验结果表明,Vc浓度在5．00×10^-7～1．50×10^-5 g·mL^-1范围内与增强的荧光强度△F呈良好线性关系,相关系数为0．9982,检测限为2．02×10^-9g·mL^-1,加标回收率为95．33％～102．67％,利用本法成功测定r不同厂家维生索c片剂中Vc的含量．     

CaAl_2O_4:Eu~(2+),Nd~(3+)纳米颗粒荧光猝灭法测定水中的Pb~(2+)

基于Pb^2＋对CaAl2O4：Eu^2＋,Nd^3＋纳米颗粒的荧光猝灭作用,建立了用琼脂溶液来固定CaAl2O4：Eu^2＋,Nd^3＋纳米颗粒并用于测定水中微量Pb^2＋的荧光分析新方法．在pH=3．0的条件下,测定的荧光最大激发波长和发射波长分别为328nm和440nm,测定Pb^2＋浓度的线性范围为6．0×10^-6mol·L^-1-8．0×10^-4mol·L^-1,回收率为97．7％-107．0％．该方法用于水中Pb^2＋的测定,结果满意．     

头孢拉定荧光光度法测定环境水中铬(VI)

基于铬（VI）对荧光试剂头孢拉定（CEFC）的荧光熄灭,建立了测定铬（VI）的荧光分析方法．在pH=3．0的盐酸介质中,最大激发与发射波长分别350nm和431nm及CEPC加入量为0．400g／L等条件下,相对荧光强度F护与铬（VI）的浓度lgc呈良好的线性关系,测定铬（VI）浓度的线性范围为1．0×10^-6-4．0×10^-4mol／L,检出限为8．3×10^-7-mol／L,常见的共存离子不干扰测定,此分析方法可用于环境水样中铬（VI）含量的测定．     

氧氟沙星荧光光度法测定痕量铁

研究了在HAc-NaAc缓冲溶液中氧氟沙星与Fe(Ⅲ)的络合反应，结果表明：在pH=4．0的缓冲溶液中，氧氟沙星有稳定而较强的荧光；与Fe(Ⅲ)络合后，荧光强度减弱．最大激发及发射波长为324nm和498．6nm，Fe(Ⅲ)的质量浓度在0．56～3．08mg／L范围内，荧光强度与浓度呈良好的线性关系．检出限为0，076mg／L，常见的共存离子不干扰其测定．本方法用于水中痕量铁的测定，得到了满意的结果。     

分光光度法测定2，4-二羟基二苯甲酮的含量

建立了测定2,4-二羟基二苯甲酮含量的分先先度法。实验表明,在pH为10的B—R缓冲溶液中,2,4-二羟基二苯甲酮在404nm波长下有最大吸收,8=4．36×10^4L／（m01．em）．于1．0×10^-5mol／L～3．0×10^-4mol／L范围内其吸光度与浓度呈良好的线性关系,其线性回归方程为A=0．4361×10^4c（mol／L）＋0．0083,相关系数为r=0．9996．用加入回收法进行试验,回收率为98．1％～104.7％．     

金(Ⅲ)-卤化物-吖啶红体系的光谱特性及应用

在pH3．6的Walpole缓冲溶液中,吖啶红（ADR）在526nm处有一吸收峰,在570nm处有一荧光峰,AuCl4^-与过量的I^-反应生成AuI2^-和I3^-,二者与ADR缔合形成[（ADR）2-AuI2-I3]n缔合微粒．它在320,400和600nm处产生3个共振散射峰,在570nm处存在荧光猝灭,在526nm处存在减色效应．Au（Ⅲ）浓度在0．047～2．84mg／L范围内与共振散射强度△I600nm呈线性关系,检测限为0．011mg／L．方法用于合成样和含金废水中金的测定,结果满意．     

基于（Sn，Ba，La）·（P04）3C1．Eu纳米颗粒荧光猝灭法测定废水中Cr（VI）

基于Cr（VI）对（Sn,Ba,La）5·（PO4）3Cl·Eu纳米颗粒的荧光猝灭作用,建立了用琼脂溶液来固定分散（Sn,Ba,La）5·（PO4）3Cl·Eu纳米颗粒并用于测定水中微量Cr（VI）的荧光分析新方法．研究表明：Cr（Ⅵ）离子对固定于琼脂溶液中的（Sn,Ba,La）5·（PO4）5Cl·Eu纳米颗粒有荧光猝灭作用．在pH=9．0的条件下,测定的荧光最大激发波长和发射波长分别为271nm和447nm,测定Cr（VI）浓度的线性范围为4．0×10^-6mol／L^-1．4×10^-4mol／L,检测限为2．99×10^-6mol／L,回收率为98．9％～103．0％．方法具有良好的重现性和选择性,一些常见金属离子不干扰测定．应用于环境水中Cr（VI）离子含量的测定,结果满意．     

基于罗丹明S缔合微粒荧光猝灭效应测定ClO-

在稀盐酸介质中,ClO^-与过量的I^-反应生成I3^-,I3^-与罗丹明S（RhS）、罗丹明B（RhB）及丁基罗丹明B（b-RhB）形成缔合微粒而导致各体系的荧光分别在550,580,580nm处发生猝灭．ClO^-浓度分别在0．020～0．35,0．020～0．51,0．020～0．35mg／L范围内与各体系的荧光猝灭强度成线性关系．各体系的检测限分别为0．016,0．028,0．029mg／L．据此建立了测定次氯酸根的荧光猝灭分析法．其中ClO^- -KI-RhS体系的灵敏度高而且稳定性较好,用于漂渍液和漂白粉中ClO^-的测定,并与碘量法对照,结果满意．     

锰在渣／N之间分配平衡的热力学评估

对不同研究者获得的锰在渣／钢之间分配平衡的相关热力学数据进行了归纳和评估。结果表明,在温度为1873K下,对组成为（O．2％～36．8％）CaO-（4．0％～69．7％）FetO-（7．5％～31．0％）Si02-（6．7％～25．0％）MgO-（O．5％～3．4％）P2O5-（3．4％～16．0％）MnO的炼钢渣,利用聚集电子相模型和经验公式计算MnO的活度与实验测定值相吻合,MnO的活度值为0．02～0．20,用正规溶液模型计算的结果低于实验测定值。MnO的活度受渣中FetO含量的影响不明显,随渣中MnO含量和渣碱度的增加而增大。在误差为±20％的范围内,可用经验公式和聚集电子相模型来预测与渣平衡钢中的锰含量。在炼钢温度下,碱度对锰的分配比影响较大,碱度相同的情况下,高FetO渣有较强的脱锰能力。在温度为1623K下,锰在渣／铁之间的分配比可以通过测定锰在渣／钢之间的分配比,再通过计算得到。     

天山花楸中总黄酮和槲皮素测定

以芦丁、槲皮素为标准品建立了用分光光度法测定天山花楸叶中总黄酮的含量和果实中槲皮素含量的测定方法，分别采用5％ NaNO2～10％Al（NO3）3～4％NaOH和2％AlCl3显色系统，并分别在510nm和422nm处进行了含量测定。结果表明：天山花楸果实中总黄酮为7．75％（RSD％=1．09），在1．596～6．384mg／100mL（R^2=0．9999）范围内，线性关系良好；7月天山花楸叶子中槲皮素为0．777％（RSD％=0．66）、8月其叶子中槲皮素为0．397％（RSD％=0．81），叶子中槲皮素在0．241～0．723mg／100mL（R^2=0．9995）范围内，线性关系良好。     

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.     

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。     

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.     

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.     

The Analects and the Moment in Peking——The influence of a Confucian education system on the personality formation,the way of thinking and the fate of the main characters

0.Preface China has long been boasting of its colorful and immense culture which comprises of Taoism,Confucianism and Buddhism.The interwoven influence among the religions on Chinese way of thinking,on the nation＇s behavior in their social life throughout the long history is beyond list.