还原—紫还分光光度法测定水中NO3^—

基于NO3^-在酸性介质中被锌粉还原后,溶液紫外吸收光谱将发生显著变化的原理,建立了测定水中NO3^-浓度的还原－紫外分光光度法,该方法采用的波长为202．0nm,水样的pH值控制为7,以试样还原前后在该条件下的吸光度变化值ΔA对NO3^-溶液的浓度进行标定,还原－紫外分光光度法测定NO3^-浓度的线性范围为0－8．5mg/L,最低检出限为0．02mg/L,且F^-,Cl^-以及HCO3^-等常见离子对温室不产生干扰,地下水,自来水,雪水以及湖水等实际水样的测定结果及加标回收实验结果表明,该方法的相对标准偏差小于2．5％,加标回收率在96．3％－103．1％,相对于标准方法（紫外分光光度法）的偏差为4．0％－4．0％,该方法的精密度,准确度和灵敏度均较高,且操作简便,适用于饮用水以及污染较轻的湖水和地下水中NO3^-含量的测定。     

紫外分光光度法测定异烟肼的含量

利用异烟肼在紫外光区的特定吸收，研究了测定异烟肼含量的最佳条件，建立了一种测定异烟肼的新方法。该法在2．0－30．0mg/L范围内符合朗伯－比耳定律，检出限为2mg/L,平均回收率为100．09％，变异系数为0．33％。本方法快捷、准确。     

反相高效液相色谱法同时测定4种苯二氮Chuo类药物

提出了一种反相高效液相色谱法同时测定4种苯二氮Chuo类药物的分析方法。考察了4种苯二氮Chuo类药物的保留值与流动相组成、流速、pH及柱温等色谱条件的关系，优化了色谱条件．确定了以ODS Hypersil为色谱柱，甲醇-水(5l：49；V／V，用氨水调pH7．8)为流动相，流速为0．8mL／min，柱温为45℃，检测波长为220nm的最佳色谱条件,甲苯作为内标物，以内标法峰面积定量,硝西泮，地西泮，三唑仑和艾司唑仑线性范围分别是0．1mg／L～320mg／L，0．2mg／L～320mg／L，0．1mg／L～320mg／L和0．08mg／L～320mg／L．检测限分别为0．1mg／L，0．2mg／L，0．1mg／L和0．08mg／L,该方法用于尿液中的苯二氮革类药物的测定,其回收率为97．0％～108．7％，标准偏差为1．7％～3．0％(n=7),该方法简单、快速、精确、灵敏、重复性好。     

含铁氨羧螯合树脂配体交换除氟研究

报道了以D401型氨羧螯合树脂螯合固载铁(Fe^3+)，利用水溶液中F^-可与Fe^3+形成稳定配合物性质，实现了配体交换固液分离去除高氟水中的氟．实验研究了该种分离材料在含氟水的除氟性能和条件．结果表明，含氟10-20mg／L左右的水溶液中，除氟率可达99％以上，可使氟含量降至0．05mg／L以下，经测定，树脂对氟的吸附量可达2．7mg F^-／gR，水中常见共存离子对氟离子的吸附无影响，表现出树脂除氟过程的高度选择性．     

米邦塔食用仙人掌组培快繁技术研究

探索了米邦塔食用仙人掌组培快繁技术。得出不定芽诱导使用培养基MS＋6-BA3．0mg／L＋NAA0．1mg/L，外植体分化率达77．3％；继代增殖使用培养基MS＋6-BA1mg／L＋KT0．5mg／L＋NAA0．3mg/L，试管苗平均增殖倍数达10.19，结合反复利用原外植体的方法，增殖效率可进一步提高；生根培养基使用1／2 MS＋NAA0．1mg／L＋IBA0．1mg／L，生根率达100％，且根系发育优良；驯化及试管苗入地后，以保湿为主要管理措施，可保证移栽成活率在95％左右。     

卡德丽亚兰根尖离体培养获得再生植株

对卡德丽亚兰根尖进行离体培养，诱导形成了愈伤组织、原球茎并获得再生植株．2，4—D对愈伤组织的形成起着主导作用；高浓度BA与低浓度NAA配合使南可诱导根尖形成原球茎并分化形成再生植株．愈伤组织员佳诱导培养基为VW 0．5mg/L 2，4—D或VW 0．1mg/L 2，4—D 0．5mg/L NAA 0．1mg/L BA；原球茎最佳诱导培养基为VW 0．5mg/L NAA 3—8mg/L BA；增殖培养基用KC 2．0mg/L BA 5％香蕉提取汁 1％活性炭．     

强化混凝与生物降解联用处理微污染原水的实验研究

该文为高锰酸钾预氧化强化混凝与亲水性悬浮填料处理微污染原水的实验研究．当原水CODMn为6．11mg／L，浊度为10．74NTU，UV254为0．158，NH3-N为1．33mg／L时，投加高锰酸钾1mg／L，聚合硫酸铰（PFS）40mg／L，聚丙烯酰胺（PAM）-0．1mg/L，生物反应柱停留时间60min，出水相应水质参数值分别为2．47mg/L、3．95NTU、0．121、0．55，去除率分别为59．5％、63．25％、23．40％、58．60％．     

蒜头果组织培养再生系统的初步研究

以蒜头果（Malania oleifera）种子萌发获得的无菌苗进行离体培养的初步研究．结果表明：MS＋6-BA1．5mg／L＋NAA0．1mg/L激素组合能够较好地诱导芽的初始分化和增殖；适宜的继代增殖培养基为MS＋6-BA1．0mg/L＋NAA0．2mg/L；采用1／2MS＋IBA0．5mg/L为生根培养基，生根率为45．0％；移栽到河沙的生根苗成活率为52．5％．     

紫外分光光度法测定环境水中的硝酸盐氮

本基于硝酸盐氮在201．2nm处有强烈吸收，且干扰少，在PH=8碱条件下，建立了用紫外分光光度法直接测定水样中的硝酸盐氮的方法。硝酸盐氮在0～7．0mg／L范围内遵守比尔定律．加标回收率为99．1％～100．1％，检出限0．1000mg／L。可用于自来水，湖水中硝酸盐氮的测定，结果满意．     

表面活性剂—火焰原子吸收法测定人发中的微量铁

研究了用表面活性剂十二烷基硫酸钠测定铁的火焰原子吸收法,摸索了测定条件,在1mol/L盐酸介质中,选定合适的仪器工作条件,铁含量0．02－0．2mg/L范围内符合比尔定律,检出限量铁浓度为1.8mg/L,经实际样品分析,变异系数不大于3．6％,样品加标回收率为98％－102％。     

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-