寻数示波极谱法测定车间空气中铅

采用ＣＣｌ４致小鼠急、慢性肝损伤模型，平行动态观察了肝组织学改变与同期血清脯肽酶和丙氨酸转氨酶变化关系。急性肝损伤中，血清ＰＬＫ和ＡＬＴ活性均明显升高，且二者变化呈显著正相关。ＰＬＤ峰值期为注射ＣＣｌ４后１６ｈ，与肝坏死最严重的时相一致。ＰＬＤ峰值和恢复时间均早于ＡＬＴ。肝硬化形成大致可分为胶原纤维增和一，肝硬化形成和肝硬化３个阶段。其间血甭ＰＬＤ活性第１周开始升高、３－６周达高峰，而后开始下降，     

关于一点的投影的一仿射集合的加权扰动分析

本文讨论了在Ｃ＾ｎ中一点的投影到一个仿射集合的加权扰动分析，我们假定长方矩阵Ａ有任意秩，扰动是任意的这最一般性情形，分别研究了当Ａ有拓动δＡ后为Ａ，当ｒａｂｋＡ＝ｒａｎｋＡ和ｒａｎＫＡ≠ｒａｎｋＡ两种情况下解ｘ的相对误差界，推广了文献「３」「４」「１１」「１２」的主要结果。     

同态原则在定性推理中的应用

本文根据抽象代数的原理，提出良好的定性推理系统应遵循“同态原则”一然后根据该原则对现行的两种定性推理理论进行分析，结果表明:deKleer时‘基手组件”的定性推理系统与其所对应的定量分析系统不是同态的;'Kuipers的“基于约缈m的定性摧理索统与其成对应的定量分析系统是聆向态的.’s后本文还给出二个如何判断定性推理系统、与“实数集3}'是否存在同态映射的充分条件.     

不稳定型二阶中立型方程正解的存在性与有界振动

本文研究一类不稳定型二阶中立型微分方程正解的存在性与有界振动．证明了在一定条件下不稳定型二阶中立型方程总存在无界正解，并给出了保证其方程的一切有界解都振动的充分条件，改进了文［１，２］中的有关条件．     

F同位素的反应总截面测量和17F可能的质子皮结构

应用透射法对中能区F同位素与C靶的反应总截面进行了测量。发现^17F的反应总截面比其邻近同位素的反应总截面稍有增强。用Glauber模型和BUU模型对F同位素进行了差异因子d的分析。^17F的差异因子d比共附近同位素稍有增强。分析结果表明^17F可能存在质子皮结构。     

QuEChERS结合UPLC-M S/M S检测血液中苯丙胺类及其相关9种物质

对QuEChERS前处理方法从提取、分离、净化等方面进行优化以减弱样本中的基质效应,提高灵敏度;使用提取试剂(含0.1%甲酸的乙腈:甲醇=70:30,V/V)进行提取,加入无水硫酸镁、硼酸钠、研磨珠进行提取分离,使用混合净化剂(十八烷基硅烷(C18):乙二胺-N-丙基硅烷(PSA)=1:2,m/m)进行净化,UPLC-MS/MS测定,外标法定量。结果表明:在优化条件下,苯丙胺类及其相关9种物质的色谱峰分离良好,且各标准化合物的线性相关系数均大于0.991,检出限(LODs)为0.3~1.0 ng/mL,定量限(LOQs)均为2.5 ng/mL;血液添加标准品样本在低(20 ng/mL)、中(100 ng/mL)、高(400 ng/mL)3个浓度的加标回收率为80.1%~103.1%,精密度相对标准偏差(RSD)为1.5%~8.6%;临床4份检测样本中有3份检出苯丙胺类阳性,准确率为71.5%~99.1%。所建立的QuEChERS方法与UPLC-MS/MS结合的分析方法可应用于血液样本中苯丙胺类及其相关9种药物的同时检测分析。     

Isoscaling behavior studied by HIPSE model

The isoscaling behavior in the reaction system of 58,64Ni + 9Be has been studied by using the heavy-ion phase-space exploration(HIPSE) model. The extracted isoscaling parameters α and β for both heavy and light fragments for HIPSE model calculations are in good agreement with recent experimental data. The investigation shows that the parameters in the HIPSE model have some effect on the isoscaling parameter. The isoscaling parameters for hot and cold fragments have been extracted.     

Scaling property in one-nucleon removal reactions induced by exotic nuclei

Assuming a core plus valence nucleon structure, one-nucleon removal reaction is investigated within the framework of few-body Glauber theory. Fermi-type distribution is used for the core density, while the wavefunction of the valence nucleon is calculated by solving the single particle eigenvalue problem of the SchrSdinger equation with the Woods-Saxon potential. The parallel momentum distribution （P//） of the fragments is calculated for isotopes with 3 〈 Z 〈 18. A remarkable scaling property is observed from the dependence of the dimensionless quantity P^2 v/R^2 e on the full width at half maximum of the parallel momentum distribution （FWHMp//）. R^2 v/R^2 c is a measure of the exotic extent of the nuclear halo. Based on the obtained 2 2 scaling law, FWHMp// can be used as an experimental observable to extract R^2 v/R^2 c and measure the exotic extent for the nuclear halo.     

Strangeness by Thermal Model Simulation at RHIC

The local temperature effect on strangeness enhancement in relativistic heavy ion collisions is discussed in the framework of the thermal model in which the K^＋ /h^＋ ratio becomes smaller with increasing freeze-out temperature. Considering that most strangeness particles of final-state particles are from the kaon meson, the temperature effect may play a role in strangeness production in hot dense matter where a slightly different temperature distribution in different areas could be produced by jet energy loss. This phenomenon is predicted by thermal model calculation at RHIC energy. The /Ф ratio in central Au＋Au collisions at 200GeV from the thermal model depends on the freeze-out temperature obviously when γs is different. It should be one of the reasons why strangeness enhancements of and Ф are different though they include two strange quarks. These results indicate that thermodynamics is an important factor for strangeness production and the strangeness enhancement phenomenon.     

Isoscaling Behavior in ^48,40Ca＋^9Be Collisions at Intermediate Energy Investigated by the HIPSE Model

The fragment production cross sections for 140 Me V/nucleon ^48,40 Ca^＋9 Be reactions are calculated by the heavyion phase space exploration （HIPSE） model. Isoscaling behavior is observed. The isoscaling parameters a and β for both heavy and light fragments from the HIPSE model calculations are in good agreement with the experimental data. It is shown that the potential parameters in the HIPSE model have very little effect on the isoscaling parameters. The effect of the excitation energy and evaporation on the isoscaling behavior is also discussed.