CCD阵列检测-流动注射分析保健食品中原花青素

建立了原花青素的流动注射分析方法。利用原花青素在强酸介质中,铁离子的催化下形成红色花色素,以NH4Fe(SO4)2、盐酸、乙醇的混合溶液为载流,用流动注射-二极管阵列检测器扫描待测物的吸收光谱图,测定最大吸收波长(545 nm)处的吸光度值。优化了影响显色反应的有关因素及流动注射参数,原花青素的浓度在0.010~0.20 mg.mL-1的范围内呈良好的线性关系。方法检出限为5μg.mL-1,加标回收率为82.47%~98.18%,相对标准差1.5%~4.9%。本文所建立的分析方法灵敏、准确,采样频率为10 samples.h-1,并已成功用于保健食品中原花青素的检测。     

高效液相色谱法测定喷昔洛韦钠原料药含量

高效液相色谱法测定了喷昔洛韦钠原料药的含量,并与常量非水滴定法的测定结果进行了比较,该法简便、快速、结果准确。为喷昔洛韦钠药物在生产过程中的质量控制提供了可靠依据。     

基底温度对电子束蒸发制备氧化铝薄膜的影响

为了考察基底温度对氧化铝薄膜折射率以及沉积厚度的影响情况,在不同基底温度环境下,通过离子辅助电子束蒸发方式,在玻璃基底上制备了同一Tooling因子条件下所监测到相同厚度的Al2O3薄膜,利用分光光度计测量光谱透过率,依据光学薄膜相关理论,计算了基底温度在25℃～300℃范围内获得的膜层实际物理厚度为275.611 nm～348.447 nm,以及膜层折射率的变化。通过对实验结果的数值计算和曲线模拟,给出了基底温度对于薄膜的折射率和实际厚度的影响情况。     

Topological and affine classification of complete noncompact flat 4-manifolds

In this paper we give topological and affine classification of complete noncompact flat 4-manifolds. In particular, we show that the number of diffeomorphism classes of them is equal to 44. The affine classification uses the results of [M. Sadowski, Affinely equivalent complete flat manifolds, Cent. Eur. J. Math. 2 (2) (2004) 332–338]. The affine and the topological equivalence classes are the same for flat manifolds not homotopy equivalent to S¹,T²$S^1,T^2$ or the Klein bottle.     

光纤麦克风传感探头设计的理论分析

鉴于光纤传感器具有体积小、结构简单、灵敏度高、抗电磁干扰且光纤本身的低损耗、耐腐蚀和安全可靠等优良特性,将光纤传感器应用到麦克风中可使麦克风的体积显著降低而灵敏度和抗电磁干扰性显著提高。提出一种新型反射式光纤麦克风的设计方法,采用Y形单根多模反射式光纤传感探头结构形式,给出了光纤麦克风的系统框图。由光纤出射光场分布理论出发,给出弹性膜片在声场作用下,中心形变大小h与出射光光强调制函数I(Z″)的关系。根据实际应用中有关参数的取值,用Matlab软件模拟出膜片形变后变形量h与光强调制函数I(Z″)的关系曲线。     

浸渍工艺对ZrO2纤维布结构及性能的影响

采用前驱体浸渍工艺制备ZrO2纤维布.利用SEM、XRD研究粘胶织物及ZrO2纤维布的微观结构;测试了ZrO2纤维布的横向抗张强度,研究了浸渍工艺对ZrO2纤维布微观结构、面密度和抗张强度的影响.结果表明:粘胶织物是制备ZrO2纤维布的理想前驱体材料;改善浸渍方式、提高浸渍溶液浓度和温度均能提高ZrO2纤维布的面密度;浸渍方式显著影响单根纤维的致密程度,残液去除方式显著影响纤维的分散程度,采用辊压浸渍和离心甩干去除残液的方式能够显著提高ZrO2纤维布的抗张强度.     

高填方地基中场地地震动参数确定研究

高填方地基的广泛应用,使得对在不同高填方地质情况下,开展研究地震动参数的变化规律有着重要的工程指导意义。根据某机场高填方工程的地基参数,分别概化建立了不同填方厚度、不同压实度、不同厚度原土基的土层计算模型。通过计算得出了场地地震动反应结果。对比研究计算结果,得出了不同高填方地层地质情况下地震动参数的变化特征。为工程设计提供了有效的参数和科学合理的依据。     

苯并咪唑类缓蚀剂的3D-QSAR研究及分子设计

采用比较分子场分析法(CoMFA)和比较分子相似性指数分析法(CoMSIA), 对苯并咪唑衍生物抗盐酸腐蚀的缓蚀性能进行了三维定量构效关系研究, 并使用留一法交叉验证手段对3D-QSAR模型的稳定性及预测能力进行了分析. 结果表明, 立体场、静电场和氢键供体场(电子给体)是影响苯并咪唑缓蚀剂缓蚀性能的主要因素; 所构建的CoMFA模型(q2=0.541, R2=0.996)和CoMSIA模型(q2=0.581, R2=0.987)均具有较好的统计学稳定性和预测能力. 基于3D-QSAR等势图设计出了几种具有较好缓蚀性能的苯并咪唑化合物, 为油气田新型缓蚀剂的研发提供了一种新思路.     

Influence of Control Parameters on the Competition Between Spiral Waves and Target Waves

In this paper we systematically investigate the influence of control parameters on the competition results between spiral waves and target waves. Driving frequency f, amplitude A and injection area n of the input signals are three important parameters and the competition results between spiral waves and target waves are influenced by these three parameters remarkably. Based on these understandings we can control spiral waves effectively by suitable combination these parameters to generate faster target waves. And the effective controllable parameter regions are also studied.     

A New Tetrasubstituted Imidazole Based Difunctional Probe for UV-spectrophotometric and Fluorometric Detecting of Fe3+ Ion in Aqueous Solution

Two new compounds,4-(2-bromophenxl-4,5-diphenyl-imidazol-1-yl)ani 1 ine(probe 1)and 4-[2,4,5-tris(4-bromopheny1)-1H-imidazol-1-y1]aniline(probe 2),were synthesized via a soft and high-efficiency one-pot microwave-assisted method under solvent-free conditions.Their sensing to different metal ions was detected by UV spectrophotometry and fluorescence spectrometry.Probe 2 revealed highly selective and sensitive UV and fluorescence response to Fe^3+ion.Upon the addition of Fe^3+ion,probe 2 showed obvious color change of the solution,conspicuous absorbance enhancement and relatively quick fluorescence quenching.The detection limit for Fe^3+ion was respectively calculated to be 0.72μmol/L(fluorescent detection)and 0.48μmol/L(UV-spectnim detection).Also,probe 2 was bound by Fe^3+ion to tonn a 1:1 complex.Moreover,preliminary application of probe 2 tor detecting Fe^3+ion in aqueous solution was attempted,and satisfying results were obtained.