偶氮胂K催化动力学光度法测定痕量铜

利用催化动力学光度法测定痕量铜多采用催化氧化动力学光度法和阻抑动力学光度法。笔者利用较少见的还原反应进行痕量铜的测定。研究发现在pH =5 .4的HAc -NaAc缓冲介质中 ,活化剂α ,α’ -联吡啶存在下 ,痕量铜 (II)能强烈地催化抗坏血酸还原偶氮胂K的反应。通过系统地研究反应的最优化实验条件 ,建立了利用还原法催化动力学光度法测定痕量铜 (II)的新方法 ,并计算了反应的活化能和反应速率常数。该方法选择性好 ,灵敏度高 ,是目前测定铜的最灵敏的方法之一。方法的检出限为 5 .4 1× 10 -10 g·L-1,检测范围为 0～ 0 .35 μg铜 (II) / 2 5mL。可用于自来水及食品中的痕量铜 (II)的测定。     

过氧化氢-茜素体系催化光度法测定痕量铜的研究

研究了催化动力学褪色光度法测定痕量铜(Ⅱ)的新体系,反应介质为NH3·H2O-NH4Cl缓冲溶液(pH=10.0),催化体系为痕量Cu(Ⅱ)催化H2O2氧化茜素的褪色反应.考察了反应体系的适宜条件、动力学性质及28种干扰离子的影响,建立了一种催化动力学光度法测定痕量铜的新指示反应.本法的线性范围为0～1.2×10-7 g/mL,其灵敏度远远高于普通光度法,检出极限为1.76×10-10g/mL,可应用于农产品和蒙药中铜的测定,相对标准偏差为1.1%～3.2%.     

褪色光度法测定痕量铬（Ⅲ）

在稀盐酸介质中,痕量铬(Ⅲ)能够催化溴酸钾氧化靛蓝胭脂红的反应,由此建立了催化动力学光度法测定痕量铬(Ⅲ)的方法.通过实验确定了反应的最佳条件.方法线性范围为0.04～0.8mg/L,检出限为4.32×10-9g/mL.将该方法用于废水、污水中痕量铬(Ⅲ)的测定,获得了较满意的结果.     

双指示剂催化动力学测定痕量铬-Cr(Ⅵ)-H_2O_2-次甲基蓝-罗丹明B体系

在pH 4.8的HAc-NaAc缓冲溶液介质中,利用痕量铬(Ⅵ)催化H2O2氧化次甲基蓝和罗丹明B褪色的指示反应,通过测量在555 nm和665 nm下催化体系和非催化体系吸光度的变化,建立双波长双指示剂催化动力学光度分析测定痕量铬(Ⅵ)的新方法.方法的线性范围为0.025～1.40μg/25mL,检出限为5.2 × 10-10g/mL.该法简单、灵敏度高、选择性好,用于废水中痕量铬(Ⅵ)的测定,结果满意.     

痕量Fe(Ⅲ)催化动力学分析的新方法

研究了硫酸介质中 ,铁 (Ⅲ )催化过氧化氢氧化百里酚蓝而使其褪色的新指示反应 ,建立了一种催化动力学光度法测痕量铁 (Ⅲ )的新方法 ,其灵敏度达到 3.4 7× 10 -10 g/mL ,测定范围是 0～ 0 .4 μgFe3 + /2 5mL .用于水样、人发中痕量铁 (Ⅲ )的测定 ,获得了满意的结果     

偶氮羧I催化动力学光度法测定痕量铋的研究

研究了在H2 SO4介质中 ,高碘酸钾氧化偶氮羧I的反应。研究发现痕量铋 (III)的存在 ,可以强烈催化高碘酸钾氧化偶氮羧I的反应 ,由此建立了一种催化动力学光度法测定痕量铋的新方法。线性范围为铋量在 0～ 0 .2 μg/mL之间 ,检出限为 2 .30× 10 -9g/mL。该方法选择性好 ,灵敏度高 ,可用于人发、天然水及合金中铋的测定     

偶氮羧Ⅰ催化动力学光度法测定痕量铋的研究

研究了在H2SO4介质中,高碘酸钾氧化偶氮羧Ⅰ的反应.研究发现痕量铋(Ⅲ)的存在,可以强烈催化高碘酸钾氧化偶氮羧Ⅰ的反应,由此建立了一种催化动力学光度法测定痕量铋的新方法.线性范围为铋量在0～0.2μg/mL之间,检出限为2.30×10-9g/mL.该方法选择性好,灵敏度高,可用于人发、天然水及合金中铋的测定.     

催化动力学光度法测定痕量铁-Fe(Ⅲ)-KBrO_3-酸性铬蓝K体系

本文研究了在稀硫酸介质中,痕量铁(Ⅲ)催化溴酸钾氧化酸性铬蓝K褪色的新指示反应及动力学条件,建立了催化动力学光度法测定痕量铁的新方法。方法的灵敏度为9.6×1O~(-10)gEe(Ⅲ)/ml。线性范围为0.05—3.5μgFe(Ⅲ)/25ml。方法用于环境水样和人发中痕量铁的测定,结果满意。     

铬-溴酸钾-偶氮氯膦(Ⅲ)体系测定水中痕量铬

在稀硫酸介质中，铬能灵敏催化溴酸钾氧化偶氮氯膦（Ⅲ）的褪色反应，据此建立了催化动力学光度法测定铬的新方法．线性范围为0．02-1．0μg/mL，检出限0．005μg/mL．测定方法具有准确、灵敏、简便，且体系稳定，用于水样中微量铬的测定，结果满意．     

Ti(Ⅲ)-孔雀绿体系催化动力学光度法测定痕量钨

基于在稀盐酸介质中 ,钨 (Ⅵ )催化Ti(Ⅲ )还原孔雀绿褪色的反应 ,建立了催化动力学光度法测定痕量钨的新方法 .方法的线性范围为 0～ 0 .8μg/mL ,检出限为 1.1× 10 - 8g/mL .本方法简便快速、选择性好 ,用于几种钨矿石样品的测定 ,取得了令人满意的结果 ,并对反应的机理进行了探讨     

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.     

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.     

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.     

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。     

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.