微波消解-ICP-MS法同时测定植物源性转基因食品中的稀土元素

建立内标法定量，微波消解-电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry, ICP-MS)同时测定植物源性转基因食品中稀土元素的分析方法，及对甜椒、玉女番茄、紫番薯、大豆、西葫芦和玉米六批次转基因样品中稀土元素含量进行数据分析.样品经前处理后，微波消解，内标法定量，用ICP-MS测定样品溶液中稀土元素含量.16种稀土元素在20.0μg/L以内呈线性关系，相关系数不低于0.999,方法所测元素的检出限在0.02～0.55μg/kg之间，方法的相对标准偏差(RSD)在0.71%～13.7%,回收率在79.8%～111.3%.该方法简单、效率快、重现性好、准确度高，能准确测定植物源性转基因食品中的稀土元素含量，可为植物源性转基因食品的稀土元素分析方法和质量标准的制定和研究提供参考.     

微波消解ICP-MS同时测定茶叶中的35种元素

采用HNO3微波消解,ICP-MS测定了茶叶中的38种元素,并从方法的线性、检出限、准确度、精密度和回收率方面进行了验证,实验表明其中35种元素的线性r>0.9960,精密度RSD<3%,回收率在89.3%～111.2%之间,满足实际样品检测的需求。本方法可以通过一次消化快速测定茶叶样品中35种元素,结果准确可靠、快速灵敏,缩短了检测周期。     

ICP-MS法测定黔产枳椇果梗、枳椇子中22种金属元素

建立微波消解-电感耦合等离子体质谱(ICP-MS)法同时分析枳椇果梗、枳椇子中Be、Mg、Al、Ti、V、Cr、Mn、Fe、Co、Ni、Cu、Zn、As、Sr、Mo、Ag、Cd、Sn、Sb、Ba、Tl、Pb等22种元素的含量。样品经微波消解后,利用ICP-MS测定上述22种元素,通过标准曲线计算其含量。实验结果表明,22种元素在其线性范围内线性关系良好,r值0.995;检出限为0.0007～1.0713μg/L;重复性的相对标准偏差(RSD)3%;精密度的相对标准偏差(RSD)7%;回收率为81.14%～112.91%。该方法灵敏度高,重复性好,分析速度快,适用于枳椇果梗、枳椇子中22种元素的含量测定。     

ICP-MS分析复方甘草口服溶液中15种元素

建立电感耦合等离子体质谱(ICP-MS)法测定复方甘草口服溶液中15种元素(Cr、Mn、Co、Ni、Cu、Zn、As、Cd、Sn、Sb、Ba、Hg、Pb、Al、Fe)。样品经微波消解后,根据待测元素的质量数选择相应元素作为内标,采用碰撞模式(氦模式)进行测定。结果显示,15种元素线性关系良好,相关系数均大于0.999,各元素的检出限在0.08～38.00ng·mL~(-1),回收率在88.57%～107.10%(n=6)。该方法操作简便,分析速度快,灵敏度高,线性范围宽,可同时测定多种元素,适用于复方甘草口服溶液中元素的测定。     

微波消解-电感耦合等离子体质谱法测定有机硅树脂中痕量铂元素

将微波消解法与电感耦合等离子体质谱(ICP-MS)相结合,通过对微波消解条件及ICP-MS测定条件进行优化,建立了微波消解-电感耦合等离子体质谱法测定有机硅树脂中痕量铂的方法,并对方法的检出限、加标回收率和精密度进行了分析.实验表明:该方法线性范围宽,线性相关系数大于0.9999,方法检出限为0.024μg/L,加标回收率在86.40%～111.74%之间,相对标准偏差小于2.0%.该方法简便、快速、准确,完全能够满足有机硅树脂中铂含量的检测要求.     

ICP-MS法同时测定桉叶油中5种有害重金属元素

建立了ICP-MS法同时测定桉叶油中有害重金属元素铅、镉、砷、铬、汞的实验方法.样品经微波消解后,直接用ICP-MS同时测定上述5种元素,结果显示5种元素的检出限分别为Pb:3.0μg/kg、Cd:0.4μg/kg、As:3.4μg/kg、Cr:2.6μg/kg,Hg:52.4μg/kg;所有元素相关系数r≥0.999 7;相对标准偏差RSD<5%;回收率在80.6%～116.1%之间.该法简便、测定速度快、结果准确,适用于桉叶油等精油中有害金属元素的测定.     

微波消解-ICP-MS法测定土壤、沉积物中多元素

考察了微波消解-电感耦合等离子体质谱（ICP-MS）法同时测定土壤、沉积物等样品中的12种元素的方法.结果表明,由3 mL HNO3-1 ml HCl-1 mL HF组成的混合酸对土壤、沉积物具有较好的消解能力.5种标准物质的测定结果表明,该方法快速简便、准确度高、精密度好是一种土壤、沉积物样品中多元素同时测定的广普方法.各元素的检出限为0.01-3.64 ng·g^-1RSD〈3.64%.     

ICP—MS法测定纺织品中痕量重金属的研究

研究了微波消解样品,试液用ICP-MS法同时测定样品中Pb、As、Dd、Cr、Ni等重金属元素.对影响其测量的各种因素进行了研究,确定了实验的最佳测定条件.结果表明,方法的检出限为0.001～0.008 μg/l,回收率为93.17%～109.12%,RSD小于3.42%.该法准确、快速、简便,适用于纺织品中重金属元素的测定.     

微波消解法和湿式消解法测定紫薯中镉的对比研究

本文通过石墨炉原子吸收法来测定紫薯中的镉元素,由微波消解法与湿式消解法处理紫薯样品,通过这两种方法的比较可知,微波消解法测得的结果更靠近实际值,镉元素的损失少;微波消解法加标的回收率在99.1%~99.8%之间,精密度为1.35%,实验说明了微波消解法具有操作简单速度快、回收率好、消解时间短等优点,符合检测分析的要求.     

食品中多种金属元素的同时测定-电感耦合等离子体质谱法

本工作利用硝酸-双氧水微波消解前处理法结合电感耦合等离子体质谱仪对食品中的15种金属元素进行同时测定。在微波消解仪的密闭高温高压条件下,经过酸体系消解食品中的金属元素完全释放出来,消解后的样品经过赶酸仪驱赶酸后,定容进行测定。在最佳实验条件下,测试了该方法的准确性、精密度及加标回收实验。实验结果表明各元素的曲线相关系数均在0.999以上,精密度和实际样品加标回收率均满足《实验室质量控制规范食品理化检测》(GB/T 27404-2008)中规定的要求。因此,该方法简单、快速,对食品中金属元素污染提供技术支撑,且对食品中金属元素污染控制方面具有重要的意义。     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-