阻抑动力学光度法测定痕量草酸

在稀盐酸介质中，痕量革酸对KIO4氧化玫瑰桃红R的褪色反应有显著的阻抑作用，据此建立了阻抑动力学光度分析测定革酸的新方法。方法的线性范围是0．008～0．500μg／mL，检测限为0．004μg／mL，用于菠菜和尿样中草酸含量的测定。     

智能石墨炉原子吸收光谱法直接测定尿镉

目的建立快速有效的减少尿镉测定中尿基体干扰的预处理方法，改善尿镉原子吸收光谱测定的效果。方法通过比较不同稀释剂、基体改进剂、升温程序及温度对尿镉测定的影响，选择0．25％Mg（NO3）2-0．5％TritonX-100作为样品稀释剂，0．1％Pdcl2-0．125％Mg（N03）2-0．5％TritonX-100-1％HNO3为基体改进剂，采用三步匀速干燥的石墨炉升温程序。该方法灵敏度b=0．21370A（μg/L），检测限为0．0716μg/L，相对偏差为0．8％～1．5％，回收率为98．8％～99．2％，线性范围0～10Ixg／L，样品稳定性〉10天。检测某电池厂镉作业工人60人，同时检测非镉接触的某单位工作人员79人，尿镉测定结果分别为（7．31±4．37）μg/gcr和（1．23±1．11）μg/gcr，两组比较，差异有统计学意义（P〈0．000）。结论该方法尿样可直接稀释测定，简单、快速、灵敏、准确、可靠，可满足大批量检测的要求。     

用离子色谱法测定人尿中的草酸

本文叙述了一种使用离子色谱技术测定人尿中的草酸的新方法。该方法只需要简单的样品制备:尿样用盐酸酸化,用去离子水按需要稀释,最后通过0.2μm孔径的微孔滤膜过滤就能直接注入离子色谱仪分析。本方法每分析一个尿样仅需10min,在稀释后的尿样中草酸的低检测限为0.1ppm(1.1μmol/l),用标准加入法获得的草酸平均回收率为100.28%。我们使用本方法测定了300多个尿样中的草酸,其线性范围为1～1000ppm,相对标准偏差为4%。本方法可以用于人尿中草酸的直接测定。     

硫酸链霉素的单扫描示波极谱法测定

建立了测定硫酸链霉素的新方法．在0．5mol/L NH3-NH4Cl(pH 10.4)缓冲溶液中，硫酸链霉素产生两个还原波，峰电位分别为-1．44V和-1．55V，其中-1．55V处还原波的二阶导数峰电流与硫酸链霉素浓度呈线性，线性范围为250-1100μg／mL，检测下限为200μg／mL。该方法用于注射液中硫酸链霉素含量的测定，结果满意．     

高效液相色谱法测定白菜中农药马拉硫磷残留量

采用高效液相色谱法测定了白菜中农药马拉硫磷残留量．研究结果显示：在10．0-50．0μg/mL浓度范围内峰面积与进样量具有良好的线性关系，相关系数r=O．9996；相对标准偏差RSD为0．21％（以峰面积计算）和0．84％（以浓度计算）；平均加标回收率在85．6％-106．0％之间；最低检出限LDD=2．0μg/L.     

离子增强-反相高效液相色谱法快速测定落羽杉中莽草酸

建立了离子增强反相高效液相色谱法(RP-HPLC)快速测定落羽杉中痕量莽草酸的方法．用色谱柱Hyper- silODS 25μm(4．6 mm×150 mm),以HClO4(pH=2．5)溶液为流动相,柱温30℃时于214 nm波长处以外标法测定．结果表明莽草酸在2．22×10-8-3．59×10-4g／mL范围内,浓度与峰面积有良好的线性关系(r=0．999 8)．莽草酸的回收率为98．52％-98．91％,相对标准偏差为1．45％-1．70％(n=5)．检测限为2．02×10-10g／mL(S／N= 2)．实验表明该法简便、快速,应用于实际落羽杉样品中莽草酸的测定,取得了很好的结果．     

HPLC法测定小儿清热止咳口服液中盐酸麻黄碱和盐酸伪麻黄碱的含量

采用C18色谱柱（4．6mm×250mm,5μm）,以甲醇-0．02mol／L磷酸二氢钠溶液（含0．2％三乙胺,磷酸调pH值2．5,9：91）为流动相,流速1．0ml·min^-1,检测波长210nm,建立反相高效液相色谱法测定小儿清热止咳H服液中盐酸麻黄碱和盐酸伪麻黄碱含量。结果表明,盐酸麻黄碱在0．102～1．02μg范围内与峰面积呈良好线性关系,r=0．9999,平均加样回收率为97．62％,RSD为1．56％（n=6）;盐酸伪麻黄碱在0．1016～1．6256μg范围内与峰面积呈良好线性关系,r=0．9999,平均加样回收率为97．55％,RSD为1．84％（,2=6）。本方法分离度好,具有良好的重复性,可以同时测定小儿清热止咳口服液中盐酸麻黄碱和盐酸伪麻黄碱的含量。     

毛细管区带电泳测定八角中莽草酸含量

建立了八角中莽草酸的毛细管区带电泳-紫外检测分析新方法．在单一磷酸盐和硼砂溶液中由于电扩散现象,莽草酸峰宽并严重前倾或脱尾,采用磷酸盐-硼砂混合溶液为缓冲液改善了峰形并提高了检测灵敏度,通过优化获得其最佳分离条件为pH8．63,10mmol／L NaH2PO4-9mmol／L硼砂,分离电压25kV．该条件下莽草酸的峰面积与浓度呈良好的线性关系,线性方程的相关系数为0．9998,检测限（S／N=3）为0．12μg／mL,比文献报道的方法约高10倍．该方法成功用于八角壳和籽中莽草酸的定量分析,其加标回收率分别为98．9％和104．6％．     

HPLC法测定蒙药巴特日七味丸中没食子酸的含量

目的：建立测定蒙药巴特日七味丸中没食子酸含量的方法．方法：采用高效液相色谱法．应用Spherisorb C18（250mm×4．6mm,5μm）色谱柱;以甲醇-0．1％磷酸水溶液（15：85）为流动相;流速为0．8ml·min^-1;检测波长为273nm;柱温为25℃．结果：没食子酸在0．102μg～0．306μg范围内,与峰面积具有良好的线性关系,r=0．9999;平均回收率为98．89％、RSD为1．41％（n=6）．结论：该方法简便、快捷、准确、重复性好,可用于巴特日七味丸中没食子酸的含量测定．     

流动注射荧光法测定微量草酸根研究

根据三价铈在稀硫酸溶液中具有很强荧光,而四价铈在相同的条件下无荧光的现象,利用流动注射荧光分析技术测定草酸根。采用草酸根还原四价铈为三价铈而建立间接测定草酸根的方法.激发光波长258nm,发射光波长354nm。线性范围0～30μs/mL。检出限0.0285μg/mL,测定频率可达120样/h。本方法简便,快速,对蔬菜中微量草酸进行测定结果令人满意。     

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。     

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.     

A computer generator for randomly layered structures

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