共查询到20条相似文献,搜索用时 15 毫秒
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Ohne ZusammenfassungUnserem hochverehrten Lehrer, Herrn Prof. Dr. Dr. h. c.Franz Patat, zum 65. Geburtstag gewidmet. 相似文献
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Zusammenfassung Zur Vermeidung der beim Abfunken hochlegierter Stähle häufig auftretenden Zündschwierigkeiten wird eine Anordnung angegeben, mit der Kondensatorentladungen bei besonders hoher Einsatzstromstärke und einer Folgefrequenz von 500 Hz erzeugt werden können. Das spektroskopische Verhalten der Entladung und ihre für die spektrochemische Anwendung günstigen Eigenschaften werden beschrieben.
Summary To avoid difficulties in ignition which often occur when sparking highly alloyed steels, an arrangement is established that makes condenser discharges at especially high starting current and at a repetition rate of 500 cps. The spectroscopic behaviour of the discharge and its favourable characteristics for spectrochemic practice are described.相似文献
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Analytical and Bioanalytical Chemistry - 相似文献
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Rhenium Compounds Containing Heterocyclic Thiols – Syntheses and Structures Reactions of trans‐[ReOCl3(PPh3)2] with 1,3‐thiazoline‐2‐thiol (thiazSH), pyridine‐2‐thiol (pyrSH) or pyrimidine‐2‐thiol (pyrmSH) result in the formation of rhenium(V) oxo complexes or rhenium(III) species depending on the conditions applied. mer‐[ReOCl3(thiazSH)(OPPh3)], trans‐[ReCl3(PPh3)(thiazSH)2], [ReO(2‐propO)(PPh3)Cl(pyrS‐S,N)], cis‐[ReCl2(PPh3)2(pyrS‐S,N)] and [ReCl2(PPh3)2(pyrmS‐S,N)] have been isolated from such reactions and structurally characterized. cis‐[ReCl2(PPh3)2(pyrS‐S,N)] and [ReCl2(PPh3)2(pyrmS‐S,N)] are obtained in better yields by ligand substitution on trans‐[ReCl3(MeCN)(PPh3)2]. The reaction between (n‐Bu4N)[ReOCl4] and purine‐6‐thiol (purinSH) gives the oxo‐bridged [O{ReO(purinS‐S,N)2}2]. 相似文献
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Wilfried Rhse 《无机化学与普通化学杂志》1978,438(1):222-232
Investigation of Iron(III)(hydr)oxides Iron(III) (hydr)oxides were precipitated under well defined conditions in the pH-range of 4.6 to 7.9. The adsorption of electrolytes (alkali carbonates) and the yield stresses of the gels could be determined as a function of the precipitation- pH and the electrolyte amount. The measurements show that the isoelectric point is reached at the pH of 6.7. The chemical structures of the charged iron(III) (hydr)oxids and the consequences with regard to their catalytic activity in the Fischer-Tropsch synthesis are discussed. 相似文献