Pulsed digital holographic interferometry by using a flexible fiber endoscope

A system based on digital holographic interferometry in combination with a flexible fiber endoscope is described. A Q-switched pulsed laser is used. Two digital holograms of the test object, corresponding to the two laser pulses, are captured at separate video frames of a CCD-camera, transferred in a frame grabber and further processed in a PC. If the object undergoes a deformation during the interval between the two laser pulses (usually in the range of 5–600 μs), a fringe pattern will result from the difference between the two holograms. This fringe pattern has the information needed to evaluate quantitatively the amount of the deformation. A compact system has been developed to be used for various applications, both mechanical and biological, where measurements need to be performed at “hidden” surfaces or inside more or less closed objects. The quality of the results obtained by using mechanical objects is usually better than for biological objects. This can be explained easily by the fact that a biological surface is much more complex, in particular some parts of the surface may reflect the light well whereas some other parts may absorb it. Experimental results are presented.     

Topographic Measurement Of Internal Surfaces Using a Sequence of Stereo Charge-Coupled DeVice Endoscopic Images: (1) Method

In endoscopic diagnosis, there has been a strong requirement to measure the internal surface topography of the rectum or esophagus. Accurate measurement, however, is very difficult, because the object is usually observed from an inclined view. In this paper, we propose a method to overcome this difficulty utilizing sequential stereo-pair images; the relative shape is roughly measured from sequential images taken by one of the change coupled device (CCD) cameras, and the size is determined by stereo-pair matching using the measured shape. A coarse-to-fine approach is also used to improve the resolution of topographic measurement. Through a basic experiment using a monocular CCD endoscope and a polyp phantom, the proposed method is confirmed to improve measurement accuracy in comparison with conventional methods.     

Reconstruction of the Gastric Surface Structure Using a Monocular CCD Endoscope

The object’s surface structure can be obtained from an image sequence taken through a conventional CCD endoscope. This paper reports clinical experimental results of the method. The accuracy of the estimation is studied and a method to estimate the reliability of the reconstructed shape is also described.     

联吡啶分光光度法测蒙药利胆胶囊中微量铁

采用浓硝酸和高氯酸的混合消解法处理苏斯-12(利胆胶囊)样品,盐酸羟胺将铁()还原成铁(),在pH为5的条件下,用联吡啶分光光度法测定铁含量,校准曲线回归方程为:y=0.1552x-0.0014(r=0.9999)。方法的加标回收率在98.4%—101.6%之间,相对标准偏差为0.29%,苏斯-12(利胆胶囊)中铁含量为3457.76μg.g-1,该方法具有操作简单、重现性好的特点,可以运用于利胆胶囊中微量铁的测定。     

Hydrogen-bonded Multicomponent Behavior in Tetra-<Emphasis Type="Italic">iso</Emphasis>-butyl-resorcin[4]arene–1,4-Bis(pyridyl)ethane–Methanol–Water (1/2/0.5/1)

Abstract  Co-crystallization of the tetra-iso-butyl-resorcin[4]arene (1) with 1,4-bis-(pyridyl)ethane (bpe) obtained from methanol yields a molecular solid of the multicomponent host–guest complex 1 · 2(bpe) · 0.5MeOH · H₂O (2) in which 1 assemblies with water molecules to form a hydrogen-bonded dimer. The bpe ligands in both cis- and trans-stereo configurations exist in the complex 2, of which trans-bpe moieties as guests are encapsulated in the capsules constructed by two pairs of opposition bowls of resorcinarenes. Graphical Abstract  The 1,4-bis(pyridyl)ethane (bpe) ligands in both cis- and trans-stereo configurations exist in a multicomponent molecular solid, of which trans-bpe moieties as guests are encapsulated in the capsules constructed by two pairs of opposition bowls of resorcinarenes.      

金纳米棒状微粒的胶囊模型及吸收光谱

提出了金纳米棒状微粒的胶囊模型,用Waterman发展的T矩阵方法计算了金纳米棒状微粒的吸收光谱.计算谱和实验谱基本符合,520 nm左右处的吸收峰对应于金纳米棒的横向表面等离体子共振（横模）,长波长处的吸收峰对应于金纳米棒的纵向表面等离体子共振（纵模）.随着金纳米棒纵横比的增加,纵模吸收峰表现出显著的红移,横模吸收峰则微弱地蓝移.此外,计算结果表明,金纳米棒状微粒外部介质的介电常数必须随着金纳米棒纵横比的增大非线性地减小.     

诺氟沙星的铽敏化化学发光法研究与应用

本文根据 Tb3+能显著增强 Ce ( ) - SO2 - 3- NFLX体系的化学发光 ,建立了流动注射铽敏化化学发光测定诺氟沙星的新方法。本法的线性范围为 9.0× 1 0 - 9～ 1 .0× 1 0 - 6 mol/L,检出限为 4.5× 1 0 - 11mol/L。利用该法测定了诺氟沙星胶囊中诺氟沙星的含量 ,并对血清和尿样进行了回收率测定 ,回收率在 1 0 0 .4%～ 1 0 5 .7% ,结果令人满意。     

内表面掺硅聚苯乙烯空心微球初步研究

 靶丸内表面掺杂诊断元素可以为内爆压缩界面的研究提供必要的手段。以二甲基二乙氧基硅烷为原料，利用乳液微封装技术和界面聚合技术可以实现单一内表面掺硅的空心聚苯乙烯微球的制备。X光照相和X能谱分析表明：内表面掺硅量比外表面高出2~3个数量级。均匀内表面掺硅层的厚度小于0.3μm，掺杂层厚度越小，均匀性越好。     

Recent Advances in Multifunctional Capsule Catalysts in Heterogeneous Catalysis?

Capsule catalysts composed of pre-shaped core catalysts and layer zeolites have been widely used in the tandem reactions where multiple continuous reactions are combined into one process. They show excellent catalytic performance in heterogeneous catalysis, including the direct synthesis of middle isoparaffins or dimethyl ether from syngas, as compared to the conventional hybrid catalysts. The present review highlights the recent development in the design of capsule catalysts and their catalytic applications in heterogeneous catalysis. The capsule catalyst preparation methods are introduced in detail, such as hydrothermal synthesis method, dual-layer method, physically adhesive method and single crystal crystallization method. Furthermore, several new applications of capsule catalysts in heterogeneous catalytic processes are presented such as in the direct synthesis of liquefied petroleum gas from syngas, the direct synthesis of para-xylene from syngas and methane dehydroaromatization. In addition, the development in the design of multifunctional capsule catalysts is discussed, which makes the capsule catalyst not just a simple combination of two different catalysts, but has some special functions such as changing the surface hydrophobic or acid properties of the core catalysts. Finally, the future perspectives of the design and applications of capsule catalysts in heterogeneous catalysis are provided.     

概率神经网络在胃镜样品红外光谱检测中的应用

将人工神经网络方法应用于人体胃镜样品红外光谱检测,以克服常规线性判别分析方法的局限性,从而提高了胃镜样品判别的准确率。概率神经网络是一种适用模式分类的径向基神经网络,采用样本的先验概率和最优判定原则对新的样本进行分类,具有识别率高、训练速度快、不会陷入局部极值等优点。文章采用概率神经网络进行胃镜样品红外光谱模式识别,将预处理后的胃镜样品光谱进行主成分分析,将得分值作为输入,建立概率神经网络判别模型。文中选取118例胃镜离体样品进行红外光谱判别分析,其中正常胃组织19例,胃炎组织64例,胃癌35例,选取其中59例样品建立概率神经网络校正模型,其余样品作为预测集来检验模型。实验结果表明,正常、炎症及癌症胃镜样品检测的总体准确率达到81.4%,对胃镜样品的判别取得了较好的结果。