Ein Gasabsorptionsapparat nach dem Zerstäubungsprinzip

Zusammenfassung In dem beschriebenen Absorptionsapparat ist es m?glich, die bei den gew?hnlichen Absorptionsverfahren erreichbare Kapazit?t gewaltig zu steigern, ohne die Menge der absorbierenden Flüssigkeit zu erh?hen. Die Flüssigkeit wird im Gase nach dem Spritzverfahren verteilt und zirkuliert etwa einmal in der Sekunde. Arbeitsweise und Anwendungen werden diskutiert. Es k?nnen sehr hohe Empfindlichkeiten beim Nachweis von Fremdstoffen erhalten werden. Das Verfahren hat noch den Vorteil, eine betr?chtliche Absorption von Nebeln zustande zu bringen.     

多重分形谱研究溶胶-凝胶SiO2疏水减反膜的激光预处理作用

采用溶胶-凝胶提拉技术制备了SiO₂疏水减反膜.使用Nd：YAG激光（波长为1064nm,脉宽为7.5ns）采用“R on 1”方式对所得膜层进行了激光预处理.在预处理前后采用“1 on 1”方式考察了薄膜的激光损伤阈值的变化,使用原子力显微镜（AFM）观察了薄膜的表面形貌的变化,并使用多重分形谱（MFS）方法分析了薄膜分形结构的变化.结果表明经过激光预处理后薄膜的抗激光损伤阈值有了明显提高,均方根表面粗糙度（R_q）稍有减小,膜面变平整,多重分形谱宽度收缩,分形区间的分布均匀性改善.这说明经过激光预处理后薄膜表面微结构趋向规整,使之能够承受更强的激光的辐照.同时也说明借助多重分形谱可以获得更多薄膜表面结构变化的信息,多重分形谱是探索强激光对光学薄膜辐照作用机理的一个十分有用的方法. 关键词： 2疏水减反膜')" href="#">SiO₂疏水减反膜 激光预处理 多重分形谱 激光损伤阈值     

反相高效液相色谱-串联质谱法测定尿液中儿茶酚胺和肾上腺素(英文)

The measurement of urine catecholamine and metanephrine concentrations is important for biochemical screening and diagnosis of pheochromocytoma.The goal of this work was to develop a simple liquid chromatography-tandem mass spectrometry(LC-MS/MS)method for determining catecholamines and metanephrines in urine to replace an existing liquid chromatographic method using electrochemical detection.Urine samples were prepared using Oasis weak-cation-exchange cartridges.The eluate was analyzed on an Agilent ZORBAX Eclipse Plus Phenyl-Hexyl column in 3 min.Adrenaline,noradrenaline,dopamine,metanephrine,normetanephrine,and their deuterated internal standards were monitored in positive electrospray ionization mode by multiple reaction monitoring(MRM).No evidence of ion suppression was observed.The assay was linear up to 5μmol/L for adrenaline,5μmol/L for noradrenaline,6.1μmol/L for dopamine,5.6μmol/L for metanephrine,and 34.6μmol/L for normetanephrine,with lower limits of quantification of 5,5,12,6 and 7nmol/L,respectively.The intra-day and inter-day precisions for all analytes ranged from 0.59%to 4.64%and1.98%to 4.80%,respectively.External quality assurance samples were assayed and showed excellent agreement with the target values.This simple method provides an improved assay for determining urine catecholamines and metanephrines.     

氯化三有机基锡和氯化三有机基铅与三苯基氧胂配合物的合成和晶体结构研究

描述了一事三苯基氧胂Ｐｈ３ＡｓＯ．Ｈ２Ｏ（１）及其与氯化三苯基锡,氯化三对氯苯基锡及氯化三苯基铅配合物「Ｐｈ３ＳｎＣｌ（ＯＡｓＰｈ３）」（２）,「（ＣｌＰｈ）３ＳｎＣｌ（ＯＡｓＰＨ３）」（３）和」Ｐｈ３ＰｂＣｌ（ＯＡｓＰｈ３）（４）的合成和晶体结构,晶体数据分别为（１）单斜晶系,空间群Ｐ２、／ｎ,ａ＝９．４６０４（７）,ｂ＝１６．６３４７（７）,ｃ＝１１．１５４４（１１）Ａ,Ｂ＝１１３．２３３（６     

Bidentate Lewis Acids Derived from o‐Diethynylbenzene with Group 13 and 14 Functions

Starting from 1,2‐diethynylbenzene, a series of bidentate Lewis acids was prepared by means of hydrometalations, in particular hydrosilylation, hydroboration, hydroalumination and terminal metalation based on group 13 and 14 elements. In the case of terminal alkyne metalation, the Lewis‐acidic gallium function was introduced using triethylgallium under alkane elimination. A total of six different Lewis acids based on a semiflexible organic scaffold were prepared, bearing −SiClMe₂, −SiCl₂Me, −SiCl₃, −B(C₆F₅)₂, −AlBis₂ (Bis=bis(trimethylsilyl)methyl) and −GaEt₂ as the corresponding functional units. In all cases, the Lewis acid functionalisation was carried out twice and the products were obtained in good to excellent yields. In the case of the twofold gallium Lewis acid, a different structural motif in the form of a polymer‐like chain was observed in the solid state. All new bidentate Lewis acids were characterised by multinuclear NMR spectroscopy, CHN analysis and X‐ray diffraction experiments.     

Optimization of permanent magnet plasma confinement

Confinement of plasma by permanent magnets is studied with three magnet geometries. Full line cusps are found to give optimum plasma density. Increase in density is primarily due to confinement of primary electrons.     

The alkaline substances of the protein derived from legume seeds

Conclusions 1. Substances containing a large amount of hexone bases and containing no tryptophan, which permits them to be assigned to the alkaline proteins of the histone type, have been isolated for the first time from legume seeds at pH 9.0–12.5 by a method developed for the purpose.2. The amino acid composition and some of the properties of these substances have been determined by chromatography.Khimiya Prirodnykh Soedinenii, Vol. 5, No. 2, pp. 102–103, 1969     

Localized partial traps in diffusion processes and random walks

Reaction-diffusion equations, in which the reaction is described by a sink term consisting of a sum of delta functions, are studied. It is shown that the Laplace transform of the reactive Green's function can be analytically expressed in terms of the Green's function for diffusion in the absence of reaction. Moreover, a simple relation between the Green's functions satisfying the radiation boundary condition and the reflecting boundary condition is obtained. Several applications are presented and the formalism is used to establish the relationship between the time-dependent geminate recombination yield and the bimolecular reaction rate for diffusion-influenced reactions. Finally, an analogous development for lattice random walks is presented.