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51.
Zusammenfassung Diskussion der Forderungen, die sich ergeben, wenn man die Eisenkorrosion in neutralen belüfteten Elektrolytlösungen als reinen diffusionskontrollierten Vorgang, entsprechend dem 1.Fickschen Gesetz betrachtet: Das 1.Ficksche Gesetz ist nur dann anwendbar, wenn sichunter sonst konstanten Bedingungen (Elektrolyt, Widerstand, Elektrodenmaterial) die Variablen Oberfläche, Konzentration des Depolarisators, Dicke der Diffusionszone, ändern. Die Diffusionsstromstärke gehorcht in dem untersuchten Fall demOhmschen Gestz; sie ist stark von dem Bearbeitungszustand der Kathode abhängig. Rechnet man die kathodischen Gewichtsverluste auf Coulombs um, so ist die Summe aus der gemessenen und der berechneten Strommenge konstant; ein Hinweis, daß die depolarisierende Sauerstoffmenge konstant und der Gewichtsverlust an der Kathode ebenfalls durch Sauerstoffdepolarisation erfolgt sein muß.Mit 5 Abbildungen.Herrn Prof. Dr.A. Klemenc zum 70. Geburtstag gewidmet. 相似文献
52.
Purple IrCl3(CCl2)(PPh3)2 results from reaction between IrHCl2(PPh3)3 and Hg(CCl3)2. X-ray crystal structure determination reveals an octahedral complex with trans-phosphine ligands and a short IrC distance to the CCl2 ligand of 1.872(7) Å, compatible with an iridiumcarbon double bond. Chloride is easily displaced from the dichlorocarbene ligand and the products which have been derived include IrCl3(CO)(PPh3)2, IrCl3(CS)(PPh3)2, IrCl3(CNMe)(PPh3)2, IrCl3(CClNMe2)(PPh3)2, IrCl3(CNHCH2CH2NH)(PPh3)2 and IrCl(CSCH2CH2S)-(PPh3)2. 相似文献
53.
We consider interpolation of operators acting on functions that belong to a given cone Q with the so‐called decomposition property. The set of all positive functions whose level sets are the level sets of a given function is the main example, and the cone of all decreasing functions is a particular case. As applications, we obtain conditions for the identity (E0 ∩ Q,E1 ∩ Q)θ,p = (E0,E1)θ,p ∩ Q and interpolation results for operators which are bounded when restricted to a given family of characteristic funcions. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
54.
In an investigation on the decomposition of oxide minerals containing Ti, Nb, Fe, U and Y mixtures of TiO2, Nb2O5, Fe2O3, U3O8 and Y2O3 have been heated in streaming Cl2 containing SOCl2. In order to avoid the formation of NbOCl3, which is highly disturbing the distribution pattern of the chlorides, the reaction boat was covered with carbon powder. TiCl4 was absorbed in sulphuric acid; NbCl5, FeCl3 and UCl4 were condensed in the reaction tube and were separated by usual methods; YCl3 remained in the reaction boat. 相似文献
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Ohne Zusammenfassung 相似文献
57.
de Campo L Yaghmur A Sagalowicz L Leser ME Watzke H Glatter O 《Langmuir : the ACS journal of surfaces and colloids》2004,20(13):5254-5261
Aqueous submicron-sized dispersions of the binary monolinolein/water system, which are stabilized by means of a polymer, internally possess a distinct nanostructure. Taking this as our starting point, we were able to demonstrate for the first time that the internal structure of the dispersed particles can be tuned by temperature in a reversible way. Upon increasing the temperature, the internal structure undergoes a transition from cubic via hexagonal to fluid isotropic, the so-called L2 phase, and vice versa. Intriguingly, in addition to the structural changes in topology, the particles expel (take up) water to (from) the aqueous continuous phase when increasing (decreasing) the temperature in a reversible way. At each temperature, the internal structure of the dispersed particles corresponds very well to the structure observed in nondispersed binary monolinolein with excess water. This agreement is independent of any thermal history (including phase transitions), which proves that the structures in the dispersed particles actually are in thermodynamic equilibrium with the surrounding water phase. 相似文献
58.
Electromagnetic sheet metal forming (EMF) is a high-speed forming process driven by the dynamics of a coupled electromagneticmechanical system. The purpose of the current work is the investigation of a possible reduction in the yield stress due to electric currents. While thermoelastic and viscoplastic effects are well-understood, the possible influence of electric currents on dislocation motion, generally referred to as the electro-plastic effect [3], is still an unresolved issue. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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Detlev?Sülzle Marcus?Bauser Thomas?Frenzel Gregor?Jost Hubertus?Pietsch Martina?Sch?fer Markus?BergerEmail author Jorma?Hassfeld Heribert?Schmitt-Willich 《Journal of Cluster Science》2015,26(1):111-118
In recognition of the seminal contributions of F. A. Cotton and A. Bino to the field of aqueous chemistry of organometallic, trinuclear cluster compounds of tungsten, we describe their modifications and use as contrast agents for X-ray computed tomography. To enable their fundamental work for an advantageous diagnostic application in medicine a new generation of polydentate W3O2 complexes with improved hydrolytical stability has been synthesized and characterized. The applicability as new metal based contrast agent has been demonstrated in a computed tomography angiography animal study with increased signal intensity. Especially the bis tridentate W3O2 complexes with their reduced stereochemical complexity represent a promising new class in the field of X-ray contrast agents. 相似文献