玉林市植物叶片中氟含量的初步调查

本文采用高氯酸对植物叶片中氟化物含量浸取，以柠檬酸钠-氯化钠-冰醋酸所组成的总离子强度调节剂（TISAB），PH控制在5．0～60之间，氟离子选择电极法测定植物叶片中微量氟，并简述TISAB对测定[F-]的影响文中采用了标准曲线法计算试样中的微量氟，其方法简便、灵敏、准确，并得出化肥厂的芒果树、南瓜藤受到污染，其氟含量随距离的增加而减少，化肥厂属于氟污染源的结论．     

氧弹燃烧-离子选择性电极法测定茶叶中的氟

采用氧弹燃烧技术对茶叶样品进行预处理,用碱溶液吸收燃烧产物,向吸收液中加入TISAB,消除Al3+、Fe3+等离子干扰,调节溶液pH值为5.6后定容,利用氟离子选择性电极标准加入法测定溶液的电势,计算茶叶中氟离子的含量.结果表明,其线性范围为10-1～10-6 mol·L-1,回收率为96.6%～102.8%.     

离子选择性电极法测定牙膏中微量的氟

测定牙膏中氟离子的含量,使用氟离子选择性电极.通过加入TISAB缓冲溶液控制测定条件,利用电位分析法,完成对牙膏中氟离子的测定.结果:回收率为98.91％,检出限为1.0×10-1-1.0×10-6mol/L.说明操作简便,方法可靠,准确度高,检出限低.值得推广.     

冷酸解离氟电极法测定牙膏中的氟含量

探讨了冷酸解离氟电极法测定牙膏中氟的含量,在冷硝酸介质中牙膏中氟解离效果最佳。讨论了总离子强度调节缓冲剂TISAB的组成及用量、溶液的PH值、加氟标液用量对准确度的影响等。实验结果表明：TISAB（I）用量在20%,溶液PH值在5.0～7.0范围时,氟离子浓度在10-2-10-6mol/L范围内,具有良好的线形关系。回归方程：E=-50.9PF-57.6,相关系数R=0.9995。加入0.50 ml0.01mol/L的氟标液加标回收率为104.1%。     

离子选择性电极直接电位法测定牙膏中游离氟

利用氟离子选择性电极直接电位法测定了牙膏中的游离氟．讨论了总离子强度调节缓冲剂(TISAB)的组成及用量，氟电极在测定后快速恢复到空白值，以及不同空白值对测定结果的影响．实验结果表明游离氟的浓度在0．1000-9．000mg／ml范围内线性关系良好．方法的最低检出限为0．02000μg／ml，相对标准偏差RSD≤2．5％，加标平均回收率为100．8％～104．7％，方法简便，准确．     

玉林市环境水体及饮用水中氟含量的初步调查

以柠檬酸钠-氯化钠-冰醋酸所组成的总离子强度调节剂(TISAB),PH控制在5.0～6.0之间,用氟离子选择电极法直接测定玉林市环境水以及自来水中的氟含量并得出玉林市的环境水与饮用水中的氟含量普遍低于国家规定标准,特别是居民饮用水.     

海水中氟氯烃的吹扫捕集气相色谱分析

建立了吹扫捕集气相色谱法测定海水中氟氯烃的方法.结果表明,本方法测得的氟氯烃的精密度和回收率高,CFC-11、CFC-113、CCl4的相对标准偏差为1.9%～4.1%,回收率为99.3%～101.0%,检测限分别为0.014 5 pmol/kg、0.033 2 pmol/kg、0.019 8 pmol/kg.本方法操作简便快速,是一种海水氟氯烃测定的可靠分析方法,已成功应用于北冰洋海域海水样品的分析测定.     

离子选择性电极连续标准加入—半对数纸图解法——测定水和废水中微量氟

本文提出一个采用微量添加技术的题示方法,阐述了方法原理,并应用于自来水,长江水和钢铁厂废水中氟含量的测定,结果满意。本法测定氟的检测下限为0.016mg/L;加标回收率为93.5～100％。还可应用本法绘制试样加标工作曲线,对相同基体的大量样品进行分析,简便、快速、准确。     

氟离子选择性电极法测定重水中微量氟

氟电极法测定氟比分光光度法具有快速、简便、干扰少和量程宽等优点,但其灵敏度比氟试剂萃取光度法差约一个数量级。为了把氟电极法用于测定重水成品中的微量氟,我们从样品含氟量低、杂质少的特点出发,改进“TISAB”(总离子强度调节缓冲液)的组分和浓度,提高了灵敏度,检测下限低于0.02PPm。氟电极格氏作图法与氟试剂萃取光度法比较,测定结果无显著性差别,灵敏度相近,回收率较好。     

微波程序压力消解-逆扩散流动注射化学发光法快速测定枸杞果中的微量铬

为了建立一种快速测定枸杞中微量铬的新方法,将样品经微波程序消解后,用亚硫酸将Cr6+还原为Cr3+,利用逆扩散流动注射分析技术,结合Cr3+对Luminol-H2O2化学发光体系的线性催化作用测定枸杞中总铬含量.结果表明:在最佳条件下,该方法的线性范围为1.0×10-12～1.0×10-7mol/L,相关系数r=0.9991,对1.0×10-7mol/LCr3+,测定的RSD为3.1%(n=11);按3倍标准偏差(3S)计算的检出限为8.64×10-13mol/L,枸杞样品中铬的质量比为8.217μg/g,加标回收率为94.81%～101.54%.该方法快速简便,灵敏度高,选择性好,用于枸杞中微量铬的测定,结果令人满意.     

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。     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.