高效液相色谱法测定分析周位酸及其有机杂质含量的方法研究

本文建立了高效液相色谱法( HPLC)定量分析周位酸及其有机杂质含量的方法.使用二极管阵列检测器确定了检测波长.通过对流动相等色谱条件的优化,确定了本方法的实验条件.采用峰面积内标法对周位酸及其有机杂质进行了定量.对该方法的准确度、精密度及响应值的线性范围进行了测定,验证了该方法的可行性.     

水泥熟料中方镁石定量分析

本文简要介绍了水泥熟料中氧化镁的定量分析方法,并采用化学方法和XRD内标法对水泥熟料中的方镁石进行定量分析,用回收率评价了该方法的准确性.结果表明:化学方法和XRD内标法定量水泥熟料中方镁石的含量是可行的,化学方法的回收率在99.40%以上,两种方法的测定结果一致.     

2-乙酰噻吩反应体系的毛细管气相色谱分析

采用毛细管气相色谱法,以草酸二乙酯为内标物,对噻吩、乙酸酐、3-乙酰噻吩和2-乙酰噻吩的混剂进行定量分析.在本研究中建立的色谱条件下,同分异构体3-乙酰噻吩同2-乙酰噻吩有较好的分离效果.建立了各组分与内标物浓度比(Y)与其积分面积比(X)之间的线性回归方程;该方法对反应体系中噻吩、乙酸酐、3-乙酰噻吩和2-乙酰噻吩的...     

GC-MS/MS法与HPLC-MS/MS法相结合检测果蔬中农药多残留

建立果蔬样品中农药多残留的快速筛查及定量分析的检测方法,前处理采用盐析-乙腈均质提取,氮吹浓缩,经GCB/PSA-SPE固相萃取柱净化,分别由GC-MS/MS和HPLC-MS/MS检测。在缺少匹配的阴性基质线性时,以各类基质做单点添加,采用试剂线性做校准曲线,预测样品中的农药残留量,若初步实验表明,任何抑制或增强效果不显著影响结果,则可用于定量分析,一旦相关残留浓度达到方法检出限,则采用匹配的基质线性或加内标法进行更精准的定量分析。通过实际检测650个国抽样品,考察了该法对不同种类果蔬样品的加标回收、线性及检出情况。结果表明,本方法通过将GC-MS/MS和HPLC-MS/MS两台不同类型的仪器相结合,不仅能够满足农药多残留日常检测要求,还提高了结果的准确性,拓宽了农药的检测种类,节约了检测方法成本。     

毛细管气相色谱法测定天然除虫菊酯

研究了毛细管气相色谱法定量分析天然除虫菊提取液中6种酯的方法,FID检测,邻苯二甲酸二丁酯作为内标物。方法的线性范围为:0.1～1.0g/L:线性相关系数为0.9958～0.9964,平均回收率为99.50%(RSD=1.10%,n=5)。     

气相色谱法测定γ-戊内酯的方法学研究

采用内标法进行了γ-戊内酯测定的气相色谱方法学研究。采用十二烷为内标物,对气相色谱分析γ-戊内酯的专属性、精密度、准确度、检测限等进行了验证。结果表明,气相色谱检测γ-戊内酯具有良好的线性（γ-戊内酯和内标物十二烷的浓度比（g/g）在0.25～2.5之间成线性,相关系数R2=0.9984）,重复测定相对标准偏差小于5.0%,加标回收率为99.5%~104.6%。实验表明内标气相色谱法可以用于γ-戊内酯的定量分析。     

-蒎烯、 对伞花烃和长叶烯

选用正十二烷为内标物,采用内标法对α-蒎烯、β-蒎烯、对伞花烃和长叶烯进行了定量分析。确定了最优的气相色谱分析条件,分别测定了α-蒎烯、β-蒎烯、对伞花烃和长叶烯的相对质量校正因子和线性回归相关系数。用内标法和面积归一法分别对试样进行了定量分析,结果表明两者误差小于2.33%。     

用线性回归法测定聚酯切片中二甘醇含量

介绍了用线性回归法测定聚酯切片中二甘醇含量的方法 ,即根据二甘醇的重量及其与内标物的峰面积比进行线性回归 ,得出线性回归方程 ,据此进行计算 ,该方法计算简单 ,准确度和精确度较高     

三氨基三苯甲烷定量分析方法

本文通过多次条件试验,确定了三氨基三苯甲烷的高效液相色谱定量分析方法。给出了该定量分析方法的线性回归方程,线性相关系数r为0.9998,线性范围0.374～5.610mg/100mL,该方法的变异系数0.5%,最小检出限0.7ng/L,回收率101.55%。     

2—氯—3—异硫氰基—1—丙烯的高效液相色谱分析

采用高效液相色谱内标法对2－氯－3－异硫氰基－1－丙烯进行定量分析。标准偏差为0．53％,变异系数为0．67％,方法回收率为98．9％,线性回归系数为0．99994。     

基于模糊预测型线性规划模型的矿山产能配置

将线性规划与模糊数学及灰色理论有机结合,构建了与产能分配实际情况较为接近的模糊预测型线性规划模型.利用灰色预测理论对各灰色系数进行白化,将模糊预测型线性规划模型转化为模糊线性规划模型,利用最优判决条件进一步转化,得到以最大隶属度为目标函数的一般线性规划模型,求解得到了矿山的最优产能分配,以实现矿山产能的科学配置和效益的最大化.     

酶标法检测抗菌素残留量数据处理方法的探讨

目的探讨酶标法检测抗菌素残留量的数据处理方法。方法采用卡那霉素和庆大霉素快速检测试剂盒(间接竞争ELISA法)检测乙型脑炎减毒活疫苗2种抗菌素的残留量;采用半对数直线、半对数二次曲线和对数直线3种方法,以最小二乘法对实验数据进行拟合处理,分析、比较实验点残差分布、残差平方和、相关系数和实验误差等指标。结果半对数直线拟合较差,半对数二次曲线和对数直线方程拟合较好;半对数二次曲线法中实验点在标准曲线两侧的分布较均匀,各点的残差平方和远小于半对数直线法;半对数二次曲线法和对数直线法所得标准曲线的相关系数较高,检测庆大霉素标准品的实验误差均小于半对数直线法。结论半对数二次曲线法和对数直线法均优于试剂盒推荐的半对数直线法,而在极限值处理、计算简便等方面对数直线法更优。     

2-氨基-4-甲基苯并噻唑的高效液相色谱分析

本文确定了2-氨基-4-甲基苯并噻唑的高效液相色谱分析方法。给出了该方法线性回归方程,线性相关系数为0.9999,线性范围0.25～2.5μg,该方法的变异系数0.0071%,样品检测限为0.25 ng,回收率99.92%。方法快速、准确。     

Identification and structure elucidation of the components of commercial linear alkylbenzenes

A gas chromatography and gas chromatography mass spectrometry study was performed on four commercial linear alkylbenzenes (LAB). A preliminary detailed analysis was done on some model compounds: four tetralin mixtures obtained by alkylation of benzene with linear dichloro n-paraffins (C₁₀, C₁₁, C₁₂, and C₁₃), 1-methyl-4-heptyltetralin and 1-methyl-3-octylindane. We concentrated on the minor components (5–10%) present in the linear alkylbenzenes. Three different types of compounds were identified: A) branched alkylbenzenes, B) 1,4-dialkyltetralins with linear alkyl groups, and C) 1,4-dialkyltetralins with branched alkyl groups. Quantitative evaluation of these minor components was also done. No evidence of 1,3-dialkylindane structures, at least those with linear alkyl groups, was found in the commercial linear alkylbenzenes studied.     

一种截顶线性聚能装药射流特性的数值模拟

为了得到特性更好的线性聚能射流,设计了一种截顶线性药型罩加矩形辅助药型罩的新型装药结构,利用ANSYS/LS-DYNA3D有限元程序对6组新型装药结构及传统装药结构进行了模拟计算,分析了矩形辅助药型罩宽度和截顶间隙长度对线性射流特性的影响。结果表明,该新型结构形成的线性射流的头部最大速度总体较传统线性聚能射流高,形成的线性射流形态更细更长,并且杵体相对较少,药型罩质量利用率较高。在6组方案中,矩形辅助药型罩宽度为1.0cm、截顶间隙为0.4cm时,该结构形成的线性聚能射流头部速度最大,为3.58km/s,连续性较好,有效宽度最大。     

线形EFP药型罩设计

为提高多EFP战斗部单位面积上的弹丸个数,提出了一种新型EFP--线形EFP,并探索了新型EFP药型罩的设计方法和毁伤效应.参考常规EFP药型罩设计方法,设计了不同形状和不同材料的线形EFP药型罩,并通过数值仿真和试验比较了线形EFP药型罩顶点厚度、形状和材料以及相邻两条预控刻槽间的圆心角对线形EFP成行性和穿甲能力的影响.结果表明,将线形EFP药型罩用于多EFP战斗部可使防空反导型战斗部对钢板的侵彻能力提高到25mm.     

Fast-responsive semi-interpenetrating hydrogel networks imaged with confocal fluorescence microscopy

The composition of semi-interpenetrating polymer networks (semi-IPNs) based on responsive N-isopropylacrylamide (NIPAAm) hydrogels has been shown to affect the kinetics of the volume phase transition. Several N-alkyl-substituted acrylamides were used as the linear polymers in a crosslinked NIPAAm network, and the kinetics was observed as a function of crosslinking density and linear polymer concentration. The time required for collapse of the network could be reduced by as much as 90%, with little change to the corresponding swelling ratio and volume phase transition temperature. However, the underlying changes in network morphology are not known, and here we present kinetics data in combination with imaging of the resulting hydrogel networks. The crosslinked networks and the linear polymers were fluorescently labeled, and the resulting morphology was imaged with confocal fluorescence microscopy and two-photon laser scanning microscopy. The most hydrophilic of the linear polymers was acrylamide, which was shown to phase separate during polymerization. The hydrophilic domains become more interconnected at higher concentrations of the crosslinker and the linear polymers. This correlates well with the kinetics of the volume phase transition for the corresponding networks. The semi-IPNs containing more hydrophobic linear polymers had very similar morphology, but some domains were present, ranging from 500 nm to 2 μm and increasing in size with increased linear polymer concentration. The time scale of collapse was an order of magnitude faster than expected, based on size of the hydrophobic N-alkyl group, when the linear polymer had the same lower critical solution temperature as the hydrogel network. This is an indication that the simultaneous collapse of the linear polymer and the crosslinked network contributes to the fast response of these semi-IPNs.     

Fabrication and applied investigation of a muscle‐like linear actuator using lonic polymer metal composites

Focusing on the existing issues of ionic polymer metal composites (IPMC), for example, little force output and swing motion, and the applied requirements in the biomimetic artificial muscles using as the actuators, under the current framework, a muscle‐like linear actuator based on the combination of Bi‐IPMC linear actuator unit, whose experimental characteristics have been discussed in our previous work, was fabricated. The performance investigation showed that it can generate a linear movement type like artificial muscle, and there is an prominent improvement of force output capabilities compared with Bi‐IPMC linear actuator unit. Also, based on the 3D printing technique, a bionic jumping robot was experimented using the fabricating muscle‐like linear actuator, and the experimental result was validated against the feasibility of muscle‐like linear actuator. POLYM. COMPOS., 38:147–156, 2017. © 2015 Society of Plastics Engineers     

基于FPGA的多通道数据隔离采集电路设计

介绍了一个基于FPGA的多通道数据隔离采集硬件电路.该电路以FPGA为主控制器,采用线性光耦设计了隔离运算放大器,实现了对多路数据的隔离采集.介绍了线性光耦的使用方法,试验验证了线性光耦的线性度及带宽特性.     

两种方法测定赤泥中可溶性硫酸根

赤泥中含有硫酸根离子,其含量对赤泥的回收利用过程带来麻烦,也对回收产品的质量有影响.本文用2种方法测定赤泥中的硫酸根并进行对比,希望找到简便、快捷、准确、精密度高的实验方法.铬酸钡分光光度法:在410nm硫酸根在0～6.00mg·(50mL)-1范围内与铬酸根吸光度呈线性关系,线性回归方程:y=0.1747x-0.00...