Sample preparation procedure for the determination of sulphur and trace metals in oil products by the ICP with a minitorch using emulsions

A quick sample preparation method was used for the determination of sulphur and trace metals in oil and oily products by the ICP with a minitorch. Stable aqueous emulsions of oils and oil products were made by using two kinds of emulsifiers (one with low sulphur content, the other sulfonated). Aqueous standard solutions can be used for the preparation of calibration solutions. The contents of S, Al, Cr, Cu, Fe, Mg, Ni and Pb in aqueous emulsions were determined and the results were in good agreement with the composition of oil standard solutions used for control analysis procedure.     

Transformations of <Emphasis Type="Italic">N</Emphasis>-ethylamines into amide derivatives under the action of sulfur monochloride

Tertiary N-ethylamines were converted into amide derivatives by reactions with sulfur monochloride and DABCO at 0 °C. Depending on the nature of the substituents in the amine, the reaction can be accompanied by unexpected transformations. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1135–1140, June, 2007.     

新型红外测油仪中的液芯波导技术

首次将液芯波导技术应用于中红外吸收测量的油成分分析领域, 研制的新型MFA-450型红外测油仪的灵敏度比现有同类型仪器提高一个数量级, 检出限为0.01 mg/L(油/萃取剂).     

N,N‐dimethylaminopyridine as initiator in the copolymerization of diglycidylether of bisphenol A with six‐membered cyclic carbonates

N,N‐Dimethylaminopyridine (DMAP) was used as initiator to cure mixtures of diglycidylether of bisphenol A (DGEBA) and 1,3‐dioxan‐2‐one (TMC) or 5,5‐dimethyl‐1,3‐dioxan‐2‐one (DMTMC). The curing was studied by differential scanning calorimetry (DSC) and Fourier transform infrared in the attenuated‐total‐reflection mode (FTIR/ATR). FTIR/ATR was used to monitor the competitive reactive processes and to quantify the evolution of the groups involved in the curing. We observed the formation of five‐membered cyclic carbonates and anionic carbonate groups that remain unreacted at the chain ends. The formation of these groups was explained by the attack of the anionic propagation species on the methylene carbon of the carbonate group, which leads to an alkyl‐oxygen rupture. By performing the cure in the thermobalance we could evaluate the loss of CO₂ produced in the samples containing carbonates. The kinetics were studied by DSC and analyzed with isoconversional procedures. The addition of carbonates slows down the curing rate. Thermogravimetric analysis (TGA) and dynamic mechanical thermal analysis (DMTA) experiments were used to evaluate the properties of the materials obtained. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 2873–2882, 2006     

一维问题的一种积分形式的流量重构算法

1引言我们考虑如下一维二阶椭圆边界值问题(-(β(x)p′)(x))′=f(x),x∈(a,b) p(a)=p(b)=0(1))其中β=β(x)是一恒正函数,且β∈H~1(a,b),f∈L~2(a,b)．事实上,在此条件下,我们可保证p∈H~2(a,b)(见[1],[2])．(1)之弱形式为：求p∈H_0~1(a,b)使得a(p,q)=(f,q),(?)q∈H_0~1(a,b),(2)其中a(p,q)=(?)_a~bβp′q′dx,(f,g)=(?)_a~bfqdx．给定(a,b)的一个分割α=x_0＜x_1＜…＜x_(n-1)＜x_n=b,令h=(?)(x_i-x_(i-1)),(?)_i表示通常相应于节点x_i的形状函数,即(?)_i是连续的分段线性函数且满足(?)_i(x_k)=δ_(ik),这里δ_(ik)=(?)i,k=0,1,…,n．又记V_h~0=span{(?)_1,(?)_2,…,(?)_(n-1)),取V_h~0作为p的逼近空间,则求解(1)的标准有限元格式为：求ph∈V_h~0使得     

甲醇与蓖麻油混合物运动粘度的实验研究

利用改型的乌别洛特毛细管粘度计,本文对243～353K温度范围内对质量配比为98.8:1.2的甲醇与蓖麻油混合物的运动粘度进行了实验研究,运动粘度测量结果的不确定度为1.06%,利用得到的实验数据拟合了甲醇 蓖麻油二元混合物的运动粘度方程.方程与实验数据最大偏差为3.31%,平均偏差为1.11%.     

物理精炼菜籽油的前处理——菜籽油的物理精炼研究(Ⅱ)

本课题采用正交试验方法,对脱胶添加剂和国产脱色白土的种类、用量及其他操作条件进行筛选试验研究,将试验结果对贵州产二级毛菜籽油进行前处理,经水蒸汽精炼后可以制得合符标准的外销色拉油。     

对完善我国工伤保险制度的思考

完善我国工伤保险制度的根本措施就是扩大工伤保险的范围、拓宽工伤保险基金的来源渠道，把工伤补偿与工伤预防、医疗康复、职业康复紧密地结合起来，不断提高工伤保险的管理水平。     

一种安全的IP网络模型的构建

本文介绍了网络安全的现状以及网络安全威胁的概念，从而提出了一种安全的IP网络模型。其主要由四大技术组件组成，既安全身份识别、安全传送、安全防御和安全监控，并对每个组件进行详细的分析，最后肯定了这种IP网络模型是安全的。     

DGPVT软件包的开发及应用

介绍了针对油藏流体及其注气体系的相态及物性的预测而开发的DGPVT软件包功能、模型及特点。基于实验数据对DGPVT软件包的预测准确性进行了检验,并与石油界知名的商用油气相态及物性计算软件包STATPACK进行了比较。