一种大视场相位测量轮廓术系统标定方法

在进行大视场相位测量轮廓术系统参量标定时需要大的标定平面和精密移动台,由于携带不方便,不易进行现场标定。提出了一种用于相位测量轮廓术系统参量的高精度、现场标定方法,采用一块较小的平面标定靶在有效测量体积内不同位置多次摆放,以获取密集的数据点。先标定出摄像机的内参量和外参量,再指定一个全局参考平面和若干辅助参考平面,然后在图像平面上分区计算出每个位置标定靶上每点相对辅助参考平面的高度差和相位差,最后应用极大似然估计法估计出相位高度映射参量。实验中平面高度测量的标准偏差达到0.0433 mm。这种方法只需要较小的平面标定靶,标定过程方便、精度高,完全适合大视场三维测量相位测量轮廓术系统现场标定要求。     

微波辅助快速制备核-壳型尿苷印迹聚合物及其在线富集应用研究

采用微波辅助加热,以尿苷为模板分子,丙烯酰胺(AA)为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,快速制备尿苷印迹聚合物,聚合时间大大缩短,仅为传统加热的1/8.采用红外光谱和扫描电镜对印迹聚合物进行表征,结果表明二氧化硅表面成功包覆尿苷印迹壳层;该印迹聚合物颗粒分散均匀,印迹壳层厚度约为100 nm.将该印...     

在线富集离子色谱-质谱联用法同时测定饲料添加剂中的16种有机酸

建立了在线富集方式结合离子色谱-质谱(IC-MS)快速分离分析16种有机酸的方法。离子色谱配备自制富集柱和分离柱对有机酸进行在线富集和分离;质谱采用大气压化学电离源负离子电离方式(APCI^-),在选择离子监控(SIM)模式下对有机酸进行定性和定量分析。采用200 μL大体积进样,在线富集时间为3 min,以NaOH溶液作为淋洗液,梯度洗脱。结果表明,富集柱和分离柱对有机酸有很好的富集分离能力;16种有机酸在30 min内完全洗脱,并在一定浓度范围内线性关系良好;方法检出限(LODs)为0.01~0.22 mg/L;加标回收率为70.6%~110.8%,相对标准偏差(RSD)≤6.3%。该方法样品前处理简单,分离速度快,有机酸检测灵敏度高,适用于多种饲料添加剂样品中有机酸添加剂的检测。     

金属-有机骨架MIL-101(Cr)掺杂聚合物整体柱的制备及其用于酚类化合物的在线固相萃取

制备了金属-有机骨架（MOF）MIL-101（Cr）掺杂聚合物整体柱，建立了在线固相萃取-高效液相色谱检测水中4-硝基苯酚、2-硝基苯酚、3-甲基苯酚和2，4-二氯苯酚的方法。考察了样品溶液pH值、上样时间、上样流速和解吸时间对酚类化合物萃取效果的影响。在最优萃取条件下，采用制备的整体柱检测水中酚类化合物，其富集因子高，线性范围宽，精密度好，检出限低，适用于水中酚类化合物的检测。制备掺杂聚合物整体柱是促进和拓宽MOFs在线固相萃取应用的有效方法之一。     

电感耦合等离子体质谱(ICP-MS)法测定地质样品中Cu和Zn的干扰研究

电感耦合等离子体质谱(ICP-MS)法标准模式测定地质样品中Cu和Zn时,样品溶液中Ti在高温下易形成TiO⁺和TiOH⁺产生离子重叠干扰,使测定值偏离真值而影响测定结果。采用氢氟酸-高氯酸-硝酸消解、王水复溶样品,通过多级在线校正⁴⁶Ti¹⁶O⁺,消除TiO⁺和TiOH⁺离子重叠干扰,研究了单质Ti与⁴⁶Ti¹⁶O⁺、质荷比63、64、65、66离子间存在的关系,建立了一种电感耦合等离子体质谱(ICP-MS)法测定地质样品中Cu和Zn的分析方法。结果表明：单质Ti对Cu和Zn产生的干扰值与其质量浓度呈非简单的正相关性,TiO⁺产生的干扰离子质荷比65离子强度比63高,质荷比64离子强度比66高;⁴⁶Ti¹⁶O⁺对质荷比63、66离子干扰增量值与单质Ti质量浓度变化无关;^6...     

污垢热阻动态监测装置及其传热计算方法的研究

介绍了污垢热阻动态监测装置的构成及特点.根据传热学基本原理,对该套装置进行了光滑管对流换热性能测试,结果表明两侧流体热平衡最大偏差小于10%,实验结果与经验公式计算的Nu数相吻合,其最大偏差小于l0%.用该装置进行换热表面污垢的动态自动监测,可以得出准确可靠的实验结果.     

LIST developments at IGISOL

The ion guide technique was developed in Jyv?skyl? during the early 1980's. In the ion guide the reaction recoil products are stopped and thermalized in high purity helium gas where they remain ionic due to high ionization potential of helium atoms. Different designs of ion guide exist for light-ion induced fusion reactions, for heavy-ion induced fusion and for proton induced fission. Although the IGISOL method is fast and universal it is chemically unselective and in many cases relatively inefficient. In order to address these deficiencies in the technique, a new laser ion source project, FURIOS (Fast Universal Resonant laser Ion Source), commenced in 2004. In addition, resonance ionization spectroscopy has been tested off – line within a sextupole ion beam guide.     

近严格凸与最佳逼近

本文研究近严格凸与最佳逼近的关系．证明了Ｂａｎａｃｈ空间Ｘ是近严格凸的当且仅当Ｘ的每个子空间是紧－半－切比晓夫空间．     

A novel synthetic strategy for preparing semi‐aromatic components modified polyamide 6 polymer

In this work, a novel synthetic path for preparing semi‐armotic components modified polyamide 6 was developed by caprolactam as solvent of purified terephthalic acid and 1,6‐hexanediamine. First, the ring opening reaction and poly‐addition of caprolactam were initiated by 1,6‐hexanediamine to generate a prepolymer containing amino groups in both ends, then followed by the poly‐condensation reaction with purified terephthalic acid, a long chain copolymer was produced, which the reaction time was reduced by 4 h compared with conventional hydrolytic ring‐opening polymerization of pure caprolactam. By varying the ratio of terephthalic acid and 1,6‐hexanediamine, a series of copolymers with different number average molecular weight and physical properties were prepared. Analytical results showed that the conversion percentage of caprolactam is significantly increased by the proposed method. Furthermore, this new copolymers exhibited excellent transparence and high decomposition temperature. Besides, the copolymers with average molecular weight ≥15,000 present good mechanical properties, making it a potentially useful application in plastics, textile yarn, and membranes. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56, 959–967