次黄嘌呤在铜电极上的伏安特性研究

研究了次黄嘌呤在铜电极上的电化学行为。实验发现,以１．９６×１０＾－３￣４×１０＾－４ｍｏｌ·Ｌ＾－１ＮａＯＨ作支持电解质时,在－０．２５￣－０．４０Ｖ的电位范围内有一灵敏的阴极峰,它是吸附于铜电极表面的Ｈｘａ与Ｃｕ＾＋络合物的溶出伏安峰,在选择的实验条件下,峰高与Ｈｘａ的浓度在１．４６×１０＾－６￣２×１０＾－３ｍｏｌ·Ｌ＾－１范围内呈良好的线性关系,最低检测限为５．６×１０＾－８ｍｏｌ·Ｌ＾－     

锌在PAN修饰的铅笔芯电极上的差分脉冲阳极溶出伏安特性

用１－（２－吡啶偶氮）－２－萘酚（ＰＡＮ）修饰铅笔芯电极研究锌的差分脉冲阳极溶出伏安特性。测得锌在ＰＡＮ修饰的铅笔芯电极（ＰＣＰＥ）上,于－０．９２Ｖ处有良好的溶出峰。峰电流ｉｐ与锌离子浓度在４．０×１０－７～４．０×１０－５ｍｏｌ·Ｌ－１范围内呈良好的线性关系。用以测定植物中的微量锌,与原子吸收法测定结果基本一致。并初步探讨了该修饰电极对锌的富集和溶出机理     

化工原料及制药中间体中二苯胺亚硝化衍生的极谱法测定

报道一种经亚硝化后用极谱定量二苯胺的极谱测定方法。在０．２ｍｏｌ／ＬＨＡｃ－０．０２５ｍｏｌ／ＬＨ＿２ＳＯ＿４－４×１０￣（－６）ｍｏｌ／ＬＮａＮＯ＿２底液中，二苯胺的亚硝化产物有一良好的极谱还原波，峰电位为－０．６１Ｖ（ｖｓ，ＳＣＥ），峰高与二苯胺浓度在２×１０￣（－７）～１×１０￣（－５）ｍｏｌ／Ｌ范围内有线性关系（ｒ＝０．９９９９）。     

稀土掺杂普鲁士蓝化学修饰电极上过氧化氢的伏安性质研究

研究了过氧化氢在稀土掺杂的类普鲁士蓝化学修饰电极（ＲｅＭＰＢＣＭＥｓ）上的电化学行为．结果表明,该修饰电极对过氧化氢的还原有稳定的催化作用．过氧化氢在修饰电极上有较低的过电位,其还原峰电位为－０９Ｖ,在１５×１０－４～２０×１０－２ｍｏｌ／Ｌ范围内峰电流与浓度呈线性关系,电极稳定可靠．     

示差脉冲溶出伏安法测定湖水中痕量硫

本文基于Ｓ２－能与Ａｇ＋生成难溶化合物的特征，在银微盘电极上研究了Ｓ２－的示差脉冲溶出伏安法（ＤＰＳＶ）．该法不要镀汞，不需搅拌，在较稀的支持电解质溶液中就能实施．ＤＰＳＶ于０．１０ｍｏｌ／ＬＨＡｃ－ＮａＡｃ及０．０１ｍｏｌ／ＬＥＤＴＡ介质中，能检出１．０×１０－８ｍｏｌ／Ｌ的Ｓ２－，Ｓ２－的浓度为１．０×１０－７～９．０×１０－７ｍｏｌ／Ｌ及１．０×１０－６～８．０×１０－６ｍｏｌ／Ｌ范围与峰电流有良好的线性关系．该法用于湖水中Ｓ２－的测定，结果令人满意，加标回收率为９５．７％，与标准分析法比较相对误差为－６．２％．     

电聚吡咯固定化酪氨酸酶电极的制备及性能

用恒电位法在电化学聚合吡咯的同时，将酪氨酸酶固定在导电聚吡咯膜内，制成一种灵敏、稳定的酪氨酸酶电极。讨论了溶液ｐ Ｈ 值和聚合电位对酶固定化的影响，对酶分子嵌入前后吡咯膜的 Ｓ Ｅ Ｍ 图和 Ｃ Ｖ 曲线进行了分析和比较。该电极响应对甲苯酚的线性范围为５ ．０ ×１０ － ８ ～１ ．０ ×１０ － ６ ｍｏｌ· Ｌ－ １ ，最适ｐ Ｈ 值为６ ．６ ，酶反应表观上遵循 Ｍｉｃｈａｅｌｉｓ＿ Ｍｅｎｔｅｎ 动力学，表观米氏常数为２ ．２ ×１０ － ５ ｍｏｌ· Ｌ－ １ 。     

溶菌酶的极谱催化氢波研究与应用

在０．３６ｍｏｌ／ＬＮＨ４Ｃｌ－０．０４ｍｏｌ／ＬＮＨ３Ｈ２Ｏ（ｐＨ８．３１）支持电解质中,溶菌酶（ＬＥ）产生一个极谱催化氢波,峰电位为－１．８０Ｖ（ｖｓ ＳＣＥ）．该极谱催化氢波二阶导数峰电流与ＬＥ浓度在 １．２ × １０－８－５．６ × １０－８ｍｏｌ／Ｌ范围内有线性关系．用于鸡蛋清中ＬＥ的测定,结果满意．     

Cr－CPFX络合吸附波的研究及其应用

在０．０５ｍｏｌ／ＬＮＨ４Ｃｌ溶液中。环丙氟哌酸与Ｃｒ（Ⅲ）发生络合反应，产生一个灵敏的还原波，峰电位为－１．６４０Ｖ（ｖｓ·Ａｇ／ＡｇＣｌ），还原峰导数峰高与Ｃｒ（Ⅲ）在１×１０－７～１×１０－６ｍｏｌ／Ｌ范围内呈良好的线性关系。本文还用多种电化学方法和技术详细研究了Ｃｒ—ＣＰＦＸ的极谱伏安行为，实验结果表明，该波为络合吸附波。本文还测定了络合物的络合比和稳定常数，提出了电极反应机理     

淀粉—KI体系光度法测定微量铜（Ⅱ）的研究

本文利用碘与淀粉的高灵敏显色反应，建立了光度法测定微量铜的新分析方法。该法简单易行，灵敏准确．Ｃｕ２＋离子浓度在１．０×１０－６～６．０×１０－５ｍｏｌ．Ｌ－１区间符合比耳定律，检测限为５×１０－７ｍｏｌ．Ｌ－１。对水样中微量铜的测定．回收率在９８．２％～９９．６％之间变化，ＲＳＤ为２．２％和２．５％。     

硫氮氧杂大环汞修饰电极的研究

利用合成的新型硫氮氧杂大环化合物为载体制备了ＰＶＣ膜汞（Ⅱ）修饰电极．该电极对汞（Ⅱ）的线性响应范围为８×１０－６～６×１０－３ｍｏｌ·ｌ－１，对大多数金属离子的选择性系数小于１×１０－３．还研究了修饰电极的各种性能，讨论了修饰电极的响应机理，并将修饰电极应用于直接电位法和电位滴定法的测定中．     

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.     

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.     

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.