石墨炉原子吸收测定生物样品中痕量铬的基体比较研究

对石墨炉原子吸收分光光度法测定生物样品中痕量铬的基体改进剂进行了比较研究,选定了Ｍｇ（ＮＯ３）２为基体改进剂,拟定了不需校正背景、不用分离直接石墨炉原子吸收法测定痕量铬的分析方法．结果表明,方法的线性范围为０～２００ｎｇ／ｍＬＣｒ,其特征量为３．５×１０－１２ｇ／１％．方法已用于人血清、人尿和人发中痕量铬的测定．     

石墨炉原子吸收测定血清中痕量硒及其基体改进剂的比较研究

在比较硒的基体改进剂的基础上，选定了Ｃｕ（ＮＯ３）２和Ｎｉ（ＮＯ３）２同时存在为基体改进剂，拟定了用石墨炉原子吸收法测定牛血清和人血清中的痕量硒的分析方法．其线性范围为０．０２０～０．１６０μｇ／ｍＬＳｅ，特征量为３．１６×１０－１２ｇ／１％，检出限为４．１８ｎｇ／ｍＬ．方法用于标准牛血清测定，结果与其标准值基本吻合，其相对误差为１．３６％；人血清测定其标准加入回收率为８７％～１０５％．     

简易氢化法测定人发中的痕量元素硒和砷

采用简易氢化法应用于电感耦合高频等离子体原子发射光谱仪（ＩＣＰ—ＡＥＳ）同时测定了人发中的痕量元素硒、砷，所用氢化物发生装置，具有结构简单、操作方便的特点。该方法的检出限为硒１．２ｎｇ／ｍＬ，砷１．０ｎｇ／ｍＬ，在１．０μｇ／ｍＬ浓度下，其相对标准偏差分别为３．９％和２．１％，回收率为９５．１％和９２．３％。应用于饮用水、茶叶等环境和生物样品中硒、砷的测定，均取得令人满意的结果。     

石墨炉原子吸收法测定水中的痕量钴

考察了石墨炉原子吸收法（ＧＦＡＡＳ）中不同基体改进剂对钴的灰化、原子化温度的影响,采用钯－锶为基体改进剂测定了自来水、井水及河水中的痕量钴,方法的灵敏度和检出限分别为０１５ｐｇ和０２１ｐｇ,回收率为９７８％～１０１３％。     

石墨炉原子吸收光谱测定微量钴

研究了石墨炉原子吸收测定微量钴，钴吸收线的特性，各种酸对钴原子化的影响以及Ｍｇ（ＮＯ３）２的基体改进效应，提出了以Ｎａ２ＳｉＯ３为稳定剂，用石墨炉原子吸收人发中痕量钴的方法。     

催化动力学光度法测定痕量铜

在ＨＡｃ－ＮａＡｃ介质中,以邻菲罗啉为活化剂,铜对抗坏血酸还原乙基橙具有强烈的催化作用,由此建立了测定痕量铜的催化动力学新方法,测定的线性范围为５～３０ｎｇ／ｍＬ,方法检出限为１．０ｎｇ／ｍＬ,直接用于人发中铜的测定,结果满意．     

无机还原剂铀（Ⅲ）──光泽精化学发光反应的研究

利用流动注射技术研究了由Ｊｏｎｅｓ柱产生的铀（Ⅲ）与光泽精的化学发光反应．建立了痕量铀的流动注射化学发光分析法，方法的检出限为２×１０－１０ｇ／ｍＬ铀，线性范围为１×１０－９～１×１０－５ｇ／ｍＬ铀，相对标准偏差为１．０％（１×１０－７ｇ／ｍＬ铀，ｎ＝１１）．此法已用于合成海水中痕量铀的测定．同时对于反应机理也进行了研究．     

Nafion修饰铂丝富集——火焰原子吸收法测定银

利用Ｎａｆｉｏｎ修饰铂丝基体富集——火焰原子吸收法测定痕量银．在０．５～３０ｎｇ／ｍＬ范围内,银的浓度与吸光值呈线性关系,该方法已用于黄铁矿中痕量银的测定,方法的相对标准偏差为３．７％,其灵敏度比常规火焰原子吸收高２５０倍．     

催化动力学光度法测定痕量铋（Ⅲ）的研究

发现了痕量铋（Ⅲ）在氨性介质中能催化高碘酸钾与靛红之间的褪色反应，研究了反应的最优化条件和动力学参数，建立了测定痕量铋（Ⅲ）的新方法。方法的最低检测限为４．９×１０＾－１２ｇ Ｂｉ（Ⅲ）／ｍＬ，检测范围为０．００３￣０．２００μｇ Ｂｉ（Ⅲ）／２５ｍＬ，用于测定人发及其它生物样品中痕量铋（Ⅲ），获得了满意结果。     

N_2O—C_2H_2火焰原子吸收法测定土壤中痕量铍和钒

本文在文献［１］、［２］的基础上，进一步研究了用Ｎ＿２Ｏ—Ｃ＿２Ｈ＿２火焰原子吸收法测定土壤样品中痕量Ｂｅ和Ｖ时，样品的消解方法及消除共存组分干扰的方法，从而建立了Ｎ＿２Ｏ—Ｃ＿２Ｈ＿２火焰原子吸收法测定土壤样品中痕量Ｂｅ和Ｖ的方法。该法具有抗干扰能力强、准确可靠、简便易行、线性范围较宽的特点。测定Ｂｅ的线性范围为０—１μｇＢｅ／ｍＬ试液；测定Ｖ的线性范围为０—２５μｇＶ／ｍＬ试液。测定Ｂｅ和Ｖ的灵敏度（１％吸收）分别为０．０１４μｇ／ｍＬ和０．５１μｇ／ｍＬ，检测限分别为０．００７μｇ／ｍＬ和０．２５μｇ／ｍＬ。     

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.