流动注射在线分离富集-火焰原子吸收光谱法用于Cr(Ⅲ)和Cr(Ⅵ)的形态分析

在单阀流动注射系统中 ,分别以串联在阀体流路中的阴、阳离子交换树脂微型柱分离富集 ,两种洗脱剂逆向洗脱 ,实现了Cr(Ⅲ )和Cr(Ⅵ )的在线分离富集和火焰原子吸收光谱法同时测定 .当富集 2min时 ,分析速度为 1 8样 /h ,测定Cr(Ⅲ )和Cr(Ⅵ )的特征浓度分别为 1 0 .1 2 μg/L和 1 4.43μg/L ( 1 %吸收 ) ,线性范围分别为0～ 1 0 μg/mL和 0～ 1 5 μg/mL ,对浓度分别为 1 μg/mL的Cr(Ⅲ )和Cr(Ⅵ )测定的相对标准偏差分别为 1 .6 2 %和 3.94% .该法应用于实际水样分析 ,加标回收率在90 .9%～ 1 0 4 5 %之间 .     

~1Rh(Ⅲ)对鲁米诺-H_2O_2-Cu(Ⅱ)化学发光抑制作用的研究及其测定

研究 Rh( )对 Lu- H2 O2 - Cu( )化学发光体系的抑制作用 ,提出在贵金属混合物中测定微量 Rh( )的新方法 :在 p H=1 2 .40～ 1 2 .6 0的碱性溶液中 ,微量 Rh( )可抑制 ( 2 .5～ 7.5)× 1 0 -3 mol/ L Lu- ( 1～ 4)× 1 0 -2 mol/ L H2 O2 - Cu( ) (与待测 Rh在同一数量级 )体系的化学发光 ,线性范围 0 .1～ 1 0μg/ m L Rh( ) ,相对标准偏差 2 % ,检出限 0 .0 4 μg/ m L Rh( ) ,已用于 7种贵金属人工混合试液和 Pt- Rh合金中 Rh的测定 .     

陕北柠条的光合特性

用Licor-6400便携式光合作用测定系统测定了陕北吴旗县柠条在年生长季内叶片净光合速率随光照度和CO2浓度的变化规律,并测定了柠条叶片的蒸腾速率(Tr)和水分利用率(WUE)随光照度的变化规律.结果表明:在年生长季内,柠条叶片光补偿点(LCP)的变动范围为37.4～70.92 μmol/(m2·s),光饱和点(LSP)为1 324.07～1 626.04 μmol/(m2·s),表观光量子效率(φ)为0.008 99～0.014 76 μmol/mol;柠条叶片的CO2补偿点(CCP)为56.76～126.80 μmol/mol,CO2饱和点(CSP)为1 154.60～1 828.86 μmol/mol.说明柠条为C3植物,不耐荫,应栽植在阳光充足的地方.柠条在年生长季内蒸腾速率(Tr)的大小排序为:Tr9月＞Tr8月＞Tr6月＞Tr7月＞Tr5月;水分利用率(WUE)高低排序为:WUE5月＞WUE7月＞WUE8月＞WUE6月＞WUE9月.     

铑(Ⅲ)一高碘酸钾一偶氮胭脂红B催化光度法测定痕量铑的研究与应用

在硫酸和热水浴中 ,Rh(Ⅲ )催化高碘酸钾氧化偶氮胭脂红B褪色 ,由此建立了测定铑的新催化光度法 .铑质量浓度在 0～ 1 1μg/2 5mL范围内符合比尔定律 ,检出限为 4 0 8× 10 - 9g/mL .对 1 0 μg/2 5mLRh(Ⅲ )测定的相对标准偏差为 2 2 0 % (n =11) .催化反应的表观活化能为 10 0 38 KJ/mol.考察了 4 0多种共存离子的影响 ,Os(IV)、Ru(Ⅲ )和Ir(IV)干扰 ,其它贵金属、有色金属和铁不干扰 .题示体系已用于某些催化剂和冶金产品中痕量铑的测定 ,结果满意 .     

双季铵盐表面活性剂的合成及表面活性研究

用脂肪酸制备了乙撑双(二甲基)季铵盐基双脂肪酸甲酯(B)及乙撑双(二甲基)季铵盐基双脂肪酸钠盐(C),用红外光谱对其结构进行了表征.经测定,分别用十二酸和十四酸制备的B1和B2其临界胶束浓度(cmc)分别为1.4×10-4和2.2×10-4 mol/L,其表面张力(γcmc)分别为30.5和37.8 mN/m;C1和C2的cmc分别为7.8×10-5和3.0×10-4 mol/L,γcmc分别为28.9和36.9 mN/m.结果表明,与普通表面活性剂相比,双子表面活性剂B1和B2的cmc要低1～2个数量级,γcmc也低了2～9个mN/m;C1、C2的cmc仅为普通表面活性剂的1/60～1/230,而γcmc相差不大.     

LC-MS/MS法测定毛曼陀罗中莨菪碱、东莨菪碱和山莨菪碱的含量

目的建立LC-MS/MS测定毛曼陀罗中莨菪碱、东莨菪碱和山莨菪碱含量的方法。方法利用盐酸与浓氨水和三氯甲烷提取毛曼陀罗根部中的生物碱,以乙腈-(0.05%甲酸)水溶液=68:32为流动相;Agilent ZORBAX SB-C18(2.1 mm×100 mm,3.5μm)的色谱柱;柱温25℃;流速0.3 mL/min;进样量:2μL。结果莨菪碱、东莨菪碱和山莨菪碱在分别为1～200 ng/mL;1～1000 ng/mL;1～1000 ng/mL的范围内有良好的线性关系。线性方程依次为:Y=813.8904X+2165.3000(r2=0.9922);Y=714.1221X+517.4311(r2=0.9892);Y=872.9971X+1024.4247(r2=0.9952);平均加样回收率分别为97.17%、97.2%、92.68%,RSD分别为1.02%、1.31%、1.41%。通过对12批曼陀罗根中莨菪碱、东莨菪碱和山莨菪碱的测定,其浓度范围分别为1～20 ng/mL;1～18 ng/mL;1～19 ng/mL。结论该方法简单、灵敏度高、稳定性好可用于毛曼陀罗中莨菪碱、东莨菪碱和山莨菪碱含量的测定。     

共振光散射测定辣根过氧化物酶

辣根过氧化物酶(HRP)催化H2O2氧化四甲基联苯胺(TMB)生成大分子聚合物并产生强烈的共振光散射,由此建立了操作简单快速、高灵敏度测定HRP的新方法. 探讨了酸度、TMB浓度、H2O2浓度、温度等对散射信号的影响. 在最佳实验条件下测定HRP的线性范围为1×10-7～1×10-6 g/L,最低检出限1.8×10-8 g/L.     

杉木优良无性系组培快繁技术体系的建立

从杉木遗传测定林中选择36株杉木优良个体进行组培快繁技术研究,在对36株杉木优良个体进行诱导、继代培养的基础上,筛选出5个优良无性系建立了相应的组培快繁技术体系.诱导培养基:1/2MS 6-BA(0.3～0.8 mg/L) 蔗糖(3%);继伐增殖培养基:1/2MS 6-BA(0.5～0.7 mg/L) IBA(0.1～0.3 mg/L) 蔗糖(3%);生根培养基:1/4改良MS IBA(0.5～1.0 mg/L)/NAA(0.5～1.0 mg/L)/ABT1#(1.0～1.5 mg/L) 蔗糖(1.5%);组培苗移栽基质中,m(黄心土):m(细沙)=9:1.采用该技术体系的杉木组培苗生根率可达90%,移栽成活率可达96%.     

广义Fibonacci数列的和公式

通过定义广义的Fibonacci数列{Gn}:Gn+1=uGn+vGn-1,G0=a,G1=b,其中a,b,u,v∈R。利用特征方程得到了数列{Gn}的通项公式Gn=((((u2+4v)～(1/2))-u)a+2b)/(2(u2+4v)～(1/2))((u+(u2+4v)～(1/2)))/2+((u2+4v)～(1/2)-u-2b/2(u2+4v)～(1/2))(((u-(u2+4v)～(1/2)))/2)n);运用数列{Gn}的递推性质,采用初等方法证明了数列{Gn}的几个求和公式∑nk=0、∑nk=0G2k 、∑nk=1G2k-1 、∑nk=0kGk、∑mk=0(-1)kGk将广义Fibonacci数列的结论进行了推广。     

聚乙烯吡啶化学修饰电极预富集-GFAAS测定废水中痕量Cr(VI)和Cr(Ⅲ)的研究

本文研究了用聚乙烯吡啶化学修饰电极预富集——石墨炉原子吸收法测定废水中痕量Cr(Ⅵ)和Cr(Ⅲ)的方法.废水中的痕量Cr(Ⅵ)被富集到经聚乙烯吡啶修饰的钨丝电极上,然后放入石墨杯中进行原子吸收测定“Cr(Ⅲ)在碱性条件下经H_2O_2氧化为Cr(Ⅵ),同法测定在pH为4的HCl介质中,测定的线性范围为1～25ng/m1,对含Cr(Ⅵ)10ng/ml的溶液十次平行测定,相对标准偏差为5.4%,检出限0.4ng/ml,二十多种共存离子不干扰测定.样品测定回收率在94～104%之间.     

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.     

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.     

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.     

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.     

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。     

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.     

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.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that