100毫升比色皿的试制及其在光度滴定测铋中的使用结果

在前两届开设的仪器分析实验中,我们曾安排同学用光度滴定法对一些金属离子进行测定,最初是用乙二胺四乙酸二钠滴定水杨酸铁,通过78、79两届学生的实践,我们确认在络合滴定的基础上进行光度比色,它既有络合滴定的准确度,又有分光光度法的快速灵敏等特点,而且主要设备简单,只需用国产721型分光光度计即可满足要求,因此可以在基础课里     

电生I2自动光度滴定药片中Vc的含量

用绿色发光二极管和硅光电二极管制成光度探头，监测电生Ｉ２滴药片中Ｖｃ时淀偻指示剂的颜色变化，通过ＭＸ２１Ｂ型光度探头式数字自动光度滴定仪实现了自动光度滴定，无需标准溶液。     

HT-1型数字式自动滴定仪的试制

HT-1型数字式自动滴定仪由四个部分组成:(1)滴定器;(2)两级微分检出器;(3)控制器;(4)A/D转换器。此仪器可以用作电位滴定。终点可由预置电位法或两级微分法检出。本文着重介绍自动滴定仪的机械部件和电子线路。仪器的指标如下: 应用浓度范围:0.01～0.5N 滴定器误差:10.00±0.02ml 精确度:±0.1mv 数字显示:±600.0mv     

示差分光光度法测定硅铁稀土合金中的硅

硅的测定至今多为重量法和容量法,手续冗长,且准确度较差。利用示差法进行硅的测定,已有过报导,结果较佳。但由于其实验仪器条件所限,致使该方法较难用于一般分析实验室中。本文的目的是将硅的示差分光光度测定法用于硅铁稀土合金中硅的测定,并探讨使用72型分光光度计的可能性。本文就试样溶解,铁干扰之消除以及被测有色液温度之控制等方面进行了研究。实验确认:用72型分光光度计进行硅铁稀土合金中硅的测定可以给出满意的结果。方法相对标准偏差为0.3％。 (一)仪器、药品仪器:72型分光光度计; 液池0.50cm。(按示差法要求进行挑选)     

光度滴定法判断COD的滴定终点

提出了判断化学需氧量(COD)滴定终点的新方法——光度滴定法,分析比较了光度滴定法和现有国标法的区别。试验结果表明:滴定终点红褐色溶液最佳吸收可见光波长是510 nm;滴定反应速度不影响光度滴定终点的确定;光度滴定曲线能够较好地确定滴定终点;实际水样测定中,国标法和光度滴定法的滴定终点判断误差分别为1.12%和0.84%;光度滴定法的相对标准偏差小于1.20%,与国标法相比无显著性差异。光度滴定法以光学的角度判断COD的滴定终点,避免了国标法的视觉判断误差,为未来检测仪器的全自动化提供了新思路。     

用Bi-EDTA为电生试剂的络合库仑滴定

1仪器与试剂 所用仪器为CT-1型自动微库仑仪(自制)(1);82-1新示波伏安仪(浙江丽水无线电厂).试剂皆为分析纯,用去离子水配制.汞膜电极的制备为取 0.1mol/L AgNO3溶液30毫升置于烧杯中,滴加1mol/L 氨水使之产生沉淀,再滴加氨水至产生的沉淀溶解,加水至100毫升,该溶液为电解液.抛光的光谱石墨电极为阴极,铂电极为阳极,用0.6毫安/厘米2电流密度进行电解约24小时,将没有镀银的那部发石墨密封在玻璃管中,露出的镀 着银膜的那部分沾上纯汞即可使用.2指示滴定终点方法 采用半微分循环伏安法指示滴定终点,即是阴极化“富集”,阳极化“溶出”,由待…     

用PAN-CHCl_3萃取光度法测定人尿中微量镍

目前,微量镍的测定,多采用含有(?)功能团的有机试剂,但其灵敏度较低。为此,我们研究了镍-PAN[1-(2-吡啶偶氮)-2-萘酚]络合物的形成和萃取的适宜条件,它的分光光度特征及络合物的组成。并据此,拟订了一个测定人尿中微量镍的新方法。实验部份一、仪器和试剂72型分光光度计;pH-2型酸度计。     

XC-AⅣ型溶解氧自动电位滴定仪

本文叙述了以双极化电极恒电流电位滴定法为基础而设计的全自动电位滴定仪。仪器采用下列线路部件:电压～脉冲转换线路、自动控制零点、自动补偿、自行滴定、直接数码读数和步进电机带动加滴定剂系统。当它用于间接测定天然水中的溶解氧时,其滴定曲线在滴定终点区的灵敏度为400mV/0.05ml(0.1000N),平均偏差为0.03ml—O_2/l。本仪器同样可用以测定pH、沉淀滴定和自动控制加液。     

亚硫酸氢钠控制输液杂质的分析方法

亚硫酸氢钠控制输液杂质的分析方法成家珍１基本原理亚硫酸氢钠与葡萄糖３－去氧葡萄糖不饱和邻酮醛结合，生成葡萄糖羟基亚硫酸，使亚硫酸使化学反应延迟，从而减少了５—ＨＭＦ的生成，因此增加了葡萄糖输液的稳定性．２仪器与试药１）仪器：紫外分光光度仪（７５１型、...     

卡尔曼滤波法在混合酸各组分浓度测定中的应用

1979年,Poulisse首次将卡尔曼滤波理论用于多组分体系分光光度分析之后,该法在多组分混合物分析中已得到广泛应用。目前国内的报道大多在多组分光度分析中应用。在滴定分析中的应用研究报道甚少。本文将卡尔曼滤波法用于混合酸各组分浓度的计算分析得到了较满意的结果,且计算速度快、所需内存少,有利于联机处理和实时分析。     

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-