纯铜中铋,锑,砷,铁,镍,铅,锡,锌的光谱定量分析

本文介绍了一种光谱定量分析方法。该方法使用ＢＹＧ０１－１氧化铜光谱标准样品，对１－４号纯铜中铋、锑、砷、铁、镍、铅、锡、锌８个杂质元素进行定量分析。分析方法简单，测定结果与化学结果基本相符。方法的测定下限为３×１０￣（０６）。     

Enhanced, Unconditionally Stable, Explicit Pseudodynamic Algorithm

In performing a pseudodynamic test, an explicit method is generally preferred over an implicit method since it involves no iteration procedure or extra hardware that is often needed for an implicit method. However, its integration time step is usually limited by stability. Hence, it is very promising for the pseudodynamic testing if an explicit method can have unconditional stability, which might eliminate the limitation on time step for the testing of a multiple degree of freedom system or a substructure system. Although an explicit pseudodynamic algorithm with unconditional stability has been successfully implemented and its superior characteristics have been identified, an enhanced unconditionally stable explicit pseudodynamic algorithm is further proposed. In this study, it is verified that both explicit pseudodynamic algorithms possess the same numerical characteristics in the step-by-step integration. However, the newly developed explicit pseudodynamic algorithm shows better error propagation properties when compared to that developed previously.     

矿石样品中Au、Pt、Pd、Rh、Ir的连续测定

文中介绍了矿石样品中Au、Pt、Pd、Rh、Ir的连续测定方法，并讨论了测定每种元素分析条件和注意事项。经过国家一级标准物质和多次样品检验，该方法可靠，易于操作。     

ICP—AES法测定海绵铁中砷、锡、铅、锑、铋

文章提出了用ICP—AES法直接测定海绵铁As、Sn、Pb、Sb、Bi含量的方法,建立了最佳工作条件。对各元素的分析线进行了选定,考察了干扰情况、介质酸度等对测定结果的影响。方法准确,快速简便,重现性好。     

Determination of Als,Cu,Mn,P in titanium-iron using ICP-AES

Titanium-iron is an important raw material with high-added value.In order to ensure the quality of steel products,accurate analysis of its impurities is very important.Common analysis using the gravimetric method and spectrophotometry to determine the chemical composition is tedious,long cycle.They no longer meet the needs of they modern mass production.This paper describes the use of plasma emission spectrometry to determine the Als,Cu,Mn,P elements,in ilmeniteing the samples were treated with hydrochloric acid,nitric acid,a small amount of hydrofluoric acid.As the acidity increased,the solution viscosity increased and spectral intensity decreased.By adding sulfuric acid digestion and quantitative means of taking strict control of smoke acidity,smoke makes sulfuric acid take nitrogen oxides and fluorine away,and then add internal standard elements.After series of tests,choose instrument conditions were selected and emission intensities of various elements and internal standard elements were determined,a set of analysis were established(precision of the method RSD is less than 5%).By comparison and analysis it was found that the results were satisfactory.The method provides accurate analysis results featuring high precision and sensitivity,low blank,simple and rapid analysis.It can meet the production needs.Analytical precision of this method is equivalent to wet analysis accuracy,analysis time was reduced to 20%of the original and greatly increased the labor productivity.It was proved that using plasma emission spectroscopy to determine titanium-iron impurity element is suitable.It can replace the traditional spectral photometer test method.     

ICP-AES法测定超基性岩石样品中的磷、锡、钒、铬、锰

应用电感耦合等离子体发射光谱法对超基性岩石样品中P、Sn、V、Cr、Mn的测定进行了研究;采用基体匹配法消除了大量基体的干扰,选择了最佳激发条件。该方法采用国家标准样品验证,结果令人满意,10次测定精密度小于5％。     

用ICP-AES法同时测定锰矿中氧化钙、氧化镁、钴、镍、锌、铅、铜含量的应用

用ICP-AES法同时测定锰矿中氧化钙、氧化镁、钴、镍、锌、铅、铜元素的分析方法,其中氧化钙、氧化镁测量范围:0.10％～15.00％,钴、镍、锌、铅、铜测量范围:0.001％～0.500％,选用元素分析谱线和仪器进行测定,相对标准偏差较小,回收率在95.92％～ 102％之间.该法测定锰矿中氧化钙、氧化镁、钴、镍、锌、铅、铜含量的分析误差和精密度符合企业标准技术要求,结果令人满意,方法快速、简便.     

ICP-AES法测定压铸锌合金中的铝、镁、铜、铅、铁、镉、锡量

本文介绍了用ICP法对压铸合金锭中铝、镁、铜、铅、铁、镉、锡八项元素的测定,确定了最佳工作条件,本方法的准确度和精密度都达到了要求,测定结果令人满意。     

Process dissociation, single-process theories, and recognition memory.

According to the assumptions of L. L. Jacoby's (1991) process dissociation method, performance in recognition memory is determined by the combination of an unconscious familiarity process and a conscious intentional recollection process. The process dissociation method is used to produce estimates of the contributions of the 2 components to recognition performance. This article investigates whether the method provides the correct estimates of components if performance actually depends on only a single process or on 2 processes different from those assumed by the method. The SAM model (G. Gillund and R. M. Shiffrin, 1984) was used to produce simulated data based on a single process. Variants of SAM with 2 processes and R. C. Atkinson and J. F. Juola's (1973) 2-process model were used to produce data based on 2 processes. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Furazolidone, amoxycillin, bismuth triple therapy for Helicobacter pylori infection

A simple and sensitive spectrophotometric method is described for the assay for the moclobemide. The method is based on the molecular interaction between the drug and chloranilic acid, to form a charge-transfer complex in which the drug acts as n-donor and chloranilic acid as pi-acceptor. Chloranilic acid was found to form a charge-transfer complex in a 1:1 stoichiometry with a maximum absorption band at 526 nm. Conformity with Beer's law was evident over the concentration range 4-36 mg 100 ml-1. A complete, detailed investigation of the complex formed was made with respect to its composition, association constant, molar absorptivity and free energy change. The method has been applied successfully to the analysis of commercially available moclobemide tablets with good recovery and reproducibility.     

ICP-OES法同时测定烧结矿中的Ca、Mg、Si、Al、Mn

介绍了用ICP-OES法对烧结矿中Ca、Mg、Si、Al、Mn五种元素同时测定的分析方法,该方法测定速度快、样品处理简单、分析精度高,能够为企业的生产提供准确及时的数据,回收率为99.5%～99.9%。     

精炼合成渣中SiO2、CaO、MgO、Al2O3、CaF2的测定

试样用混合熔剂熔融,稀盐酸浸取酸化、定容,移取部分试液,通过控制分析时各组分的酸度,分别用硅钼蓝光度法测定SiO2,EDTA滴定法测定MgO,强碱沉淀分离、氟化盐置换、EDTA滴定法测定Al2O3,EDTA滴定法测定CaO总量。利用CaO易被乙酸溶解,而CaF2不溶解于乙酸的特性,另称取一份试样用稀乙酸处理过滤后,将滤液定容,移取部分滤液,用EDTA滴定法测定CaO量。该方法实现了多成分联合快速测定,SiO2、CaO、MgO、Al2O3、CaF2的相对标准偏差分别<1.21%、0.16%、1.39%、0.61%和1.14%。     

纯铝中硅铁铜镓钛的光度法快速测定

提出了用一份制备液同是测定纯铝中硅，铁，铜，镓钛的新方法。用氧化钠溶解试样，盐酸酸化，然后用硅钼蓝光度法测定硅，邻二氮杂菲光度法测定铁，双环己酮草酰二腙光度法测定铜，丁基罗丹明Ｂ光度法测定镓，二安替比啉甲烷光度法测定钛，利用该方法分析铝标样，其结果与标准值合合，该方法简便，快速，准确。     

Simple, Robust, and Efficient Algorithm for Gradually Varied Subcritical Flow Simulation in General Channel Networks

This paper details the development of a method for subcritical flow modeling in channel networks by using the implicit finite-difference method. The method treats backwater effects at the junction points on the basis of junction-point water stage prediction and correction (JPWSPC). It is applicable to flows in both looped and nonlooped channel networks and has no requirement on the flow directions. The method is implemented in a numerical model, in which the Saint-Venant equations are discretized by using the four-point implicit Preissmann scheme, and the resulting nonlinear system of equations is solved by using the Newton-Raphson method. With the help of JPWSPC, each branch is computed independently. This guarantees the simplicity, efficiency, and robustness of the numerical model. The model is applied to two hypothetic channel networks and a real-life river network in South China. All the networks contain both branched and looped structures. The simulated results compare well with the results from literature or the measurements.     

Treatment of snake, insect, scorpion, and spider bites in the pediatric emergency department

Obtaining an adequate depth of anesthesia is a continuous challenge to the anesthetist. With the introduction of muscle-relaxing agents the traditional signs of awareness are often obscured, or difficult to interpret. These signs include blood pressure, heart rate, pupil size, etc. However, these factors do not describe the depth of anesthesia (DA) in a cerebral activity sense. Hence, a better measure of the DA is required. It has been suggested that Auditory-Evoked Potentials (AEP) can provide additional information about the DA. The general method of extracting AEP is by use of a Moving Time Average (MTA). However, the MTA is time consuming because a large number of repetitions is needed to produce an estimate of the AEP. Hence, changes occurring over a small number of sweeps will not be detected by the MTA average. We describe a system-identification method, an autoregressive model with exogeneous input (ARX) model, to produce a sweep-by-sweep estimate of the AEP. The method was clinically evaluated in 10 patients anesthetized with alfentanil and propofol. The time interval between propofol induction and the time when the Na-Pa amplitude was decreased to 25% of the initial amplitude was measured. These measurements showed that ARX-estimated compared to MTA-estimated AEP was significantly faster in tracing transition from consciousness to unconsciousness during propofol induction (p < 0.05).     

ICP-AES法测定硅铁中锰、磷、铝、钙、铬、镍、铜

以电感耦合等离子体光谱法(ICP-AES)直接同时进行硅铁中Mn、P、Al、Ca、Cr、Ni、Cu的测定，提出了：试样溶解的方法、元素的干扰情况、元素分析谱线的最佳选择和背景校正的最佳方法。优化了仪器工作条件，综合确定了最佳试验条件。结果表明，该法准确、快速、简便，精密度、回收率、标准样品分析对照均取得了满意的结果。     

能量色散X-射线荧光光谱法测定钼精矿中钼、铁、铅、铜、二氧化硅、氧化钙

采用硼酸镶边垫底,粉末压片法制样,用标准样品建立工作曲线,能量色散X-射线荧光光谱法同时测定了钼精矿中钼、铁、铅、铜、二氧化硅、氧化钙的含量。讨论了样品粒度、压片机压力对测定结果的影响;选择了合适的激发条件;采用经验系数法解决了元素间的相互干扰。测定结果与国家标准方法的测定值相符,相对标准偏差在0.28%-6.74%之间。可满足日常分析工作需要。     

ICP-AES法测定镨钕氧化物及镨钕金属中的镧、铈、钐、钇、铝和硅量

重点研究了镨钕配分对测定镨钕中镧、铈、钐、钇、铝、硅量的影响。通过研究镨钕配分与其空白值之间的关系,采用一定校正方法,成功地用一套标样解决了不同镨钕配分试样中的镧、铈、钐、钇、铝和硅量的测定问题。方法简单易行,结果稳定可靠。与ICP-M S的对照结果令人满意。     

电感耦合等离子体原子发射光谱法测定金矿石中铅锌砷铋镉汞

国家标准方法测定金矿石中的铅、锌、砷、铋、镉和汞需多次溶样,操作繁琐。研究建立了混合酸消解,电感耦合等离子体原子发射光谱法同时测定金矿石中铅、锌、砷、铋、镉和汞的分析方法。实验对混合酸加入量、氟化氢铵溶液加入量、消解温度、消解时间等影响因素进行了优化。该方法各元素加入标准物质回收率为98.0%~104.0%,测定结果的相对标准偏差(n=11)为0.60%~4.76%,且与国家标准方法测定结果一致,具有操作简单,一步消解、多元素同时测定,检测效率高等优点,适用于大批量金矿石样品的检测。     

Comparison of numerical modeling techniques for complex,two-dimensional,transient heat-conduction problems

The accuracy, stability, and cost of the standard finite-element method, (Standard), Matrix method method of Ohnaka, and alternating-direction, implicit finite-difference method (ADI) have been compared using analytical solutions for two problems approximating different stages in steel ingot processing. The Standard and Matrix methods both employ triangular elements and were compared using the Dupont, Lees, and Crank-Nicolson time-stepping techniques. Other variables include mesh and time-step refinement, type of boundary condition formulation, and the technique for simulating phase change. The best overall combination of methods investigated for modeling two-dimensional, transient, heat conduction problems involving irregular geometry was the Dupont-Matrix method with a lumped boundary condition formulation and temperature dependent properties evaluated at time level two, coupled with the Lemmon latent-heat evolution technique if phase change is involved. For problems with simple geometry, the ADI method was found to be more cost effective.