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  • Articles  (27)
  • Engineering  (12)
  • Inorganic Chemistry  (8)
  • Condensed Matter: Electronic Properties, etc.  (7)
  • 11
    Electronic Resource
    Electronic Resource
    Oxofluorovanadates(V). II Dioxodifluorovanadates (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 255-259 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ammonium-, Natrium-, Hexamminkobalt (III) und Åthylendiaminium-dioxofluorovanadat(V), MIVO2F2. wurden dargestellt und durch Röntgenpulveraufnahmen, IR-Spektrum und im Falle des NH4-Salzes-Thermogravimetrie charakterisiert.
    Notes: The syntheses of ammonium, sodium, hexamminecobalt(III) and ethylene-diamine dioxodifluorovanadate(V), MIVO2F2, are reported. Their x-ray powder diffraction data are different from those of the corresponding tetrafluoroborates and perchlorates. Their infrared spectra have been recorded (700-4000 cm-1), and probable band assignments made. The ammonium dioxodifluorovanadate has been studied through thermogravimetry, and the composition of an intermediate product is discussed from its chemical analysis and infrared spectrum.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713840310
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  • 12
    Electronic Resource
    Electronic Resource
    Oxofluorovanadates(V). IV. Dioxotetrafluorovanadates (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 390 (1972), S. 311-315 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es werden die Darstellung und die Eigenschaften der Salze M3IVO2F4 (M = NH4+, Na+, K+, 1/2 Ni2+ 1/3 [Co(NH3)6]3+) beschrieben. Aus Leitfähigkeitsmessungen von Na3VO2F4 in verschiedener Konzentration wird auf eine Dissoziation in 3 Na+- und VO2F43--Ionen geschlossen. Der Ionenaustausch von (NH4)3VO2F4-Lösung am Kationenaustauscher (H+-Form) zeigt, daß die entsprechende Säure zum Teil zu V2O5 zerfällt. (NH4)3VO2F4, reagiert mit BaCl2- und AgNO3- Lösungen unter Bildung von BaVO2F3 bzw. AgVO3. Röntgen-Untersuchungen sind an (NH4) VO2F4- und Na3VO2F4-Pulvern durchgeführt worden.
    Notes: Preparation and properties of the salts of the series MI3VO2F4, where M = NH4+, Na+, K+, 1/2 Ni2+, and 1/3 [Co(NH3)6]3+ are described. Molecular conductivity of Na3VO2F4 at different dilutions indicates that Na3VO2F4 dissociates into 3 Na+ and VOaF43- ions. Ion exchange study of (NH4)3VO2F4 solution through cation exchange resin (H+ form) suggests that the corresponding acid decomposes partly to vanadium pentoxide. Reaction between (NH4)3VO2F4 with BaCl2 and AgNO3 solutions shows the formation of BaVO2F3 and AgVO3 respectively. Thermogravimetric study of (NH4)3VO2F4 shows the formation of impure vanadium pentoxide as the ultimate product on heating up to 450°C. X-ray powder diffraction data are given for (NH4)3VO2F4 and Na3VO2F4.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19723900311
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  • 13
    Electronic Resource
    Electronic Resource
    Complex Carbonates of Iron(III) (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 327-336 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Komplex-Carbonate des Eisen (III).Komplex-Carbonate des Eisen(III) (Formeln siehe Abstract) wurden dargestellt und thermogravimetrisch untersucht. Das Eisen liegt hier im Anion des Komplexes vor, und die Lösungen dieser Komplexe haben ein Absorptionsmaximum bei 460 nm. Die IR-Spektren wurden aufgenommen und Bandenzuordnungen vorgenommen. Die Reaktion zwischen KHCO3 und Fe(NO3)3 wurde mit chemischen und physikalischen Methoden untersucht.
    Notes: The complex carbonates of iron(III) are shown to be anionic in nature. The solutions containing these complexes show a maximum absorbance at 460 nm. The complex carbonates of iron(III), viz., (i) K6[Fe2(OH)2(CO3)5] · H2O,  -  (ii) Na2[Fe3O2(OH)3(CO3)2],  -  (iii) K[Co(NH3)6]2[Fe3(OH)4(CO3)6],  -  (iv) K5[Co(NH3)6]3[Fe3(OH) 4(CO3)6]2,  -  (v) K[Co(NH3)6][Fe2(OH)4(CO3)3], and (vi) NH4[Co(NH3)6][Fe2(OH)4(CO3)3] are isolated and studied by thermogravimetry. The infrared spectra of these compounds are recorded and probable band assignments made. Besides, the reaction between KHCO3 and Fe(NO3)3 was studied through chemical and physicochemical methods.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030312
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  • 14
    Electronic Resource
    Electronic Resource
    Complex Carbonates of Chromium(III) (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 404 (1974), S. 81-86 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Komplex-Carbonate des Chrom(III)Durch Mischen von Cr(III)-Lösungen mit Lösungen von (NH4)2Co3 oder KHCO3 werden tieffarbige Lösungen und mit NaHCO3 ein Niederschlag erhalten. Das Spektrum von Cr(NO3)3 (violett) gelöst in 35proz. KHCO3-Lösung zeigt Absorptionsmaxima bei 430 und 580 nm, wogegen Cr(NO3)3 (violett) Absorptionsmaxima bei 410 und 575 nm hat. Die Lösung von Cr(III) in 20proz. KHCO3-Lösung wurde durch Ionenaustausch untersucht. Die Komplex-Carbonate des Chroms (Formeln siehe Abstract) wurden dargestellt und thermogravimetrisch untersucht sowie die IR-Spektren aufgenommen und Bandenzuordnungen vorgenommen.
    Notes: On adding chromium(III) solution to solutions of (NH4)2CO3 or KHCO3, deep coloured solutions are obtained, whereas, in the case of NaHCO3 a precipitate is obtained. The spectrum of chromium(III) nitrate (violet) dissolved in KHCO3 (35%) solution shows maximum absorbances at 430 and 580nm, whereas the spectrum for chromium(III) nitrate (violet) shows maximum absorbances at 410 and 575 nm. The chromium(III) solution dissolved KHCO3 (20%) is studied by ion exchange method. The complex carbonates of chromium (III), viz., (i) (NH4)2[Cr2(OH)4(CO3)2] · H2O, - (ii) K7[Cr4(OH)9(CO3)5] · 6 H2O, - (iii) Na3[Cr2(OH)5(CO3)2] · 4 H2O, - (iv) NH4[Co(NH3)6] [Cr3(OH)7(CO3)3] · 4 H2O, and (v) K6[Co(NH3)6]2[Cr2(OH)4(CO3)3]3 are isolated and studied by thermogravimetry. The infrared spectra of these compounds are recorded and probable band assignments made.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744040107
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  • 15
    Electronic Resource
    Electronic Resource
    Mechanistic studies on the Reactions of Cis-Diaquobis (Biguanide)Chromium(III) ion with 2,2′-dipyridyl and 1,10-phenanthroline (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 424 (1976), S. 93-96 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Untersuchungen der Mechanismen der Reaktionen des cis-Diaquobis(biguanid)-Chrom(III)-Ions mit 2.2′-Dipyridyl und 1.10-PhenanthrolinKinetische Untersuchungen in wäßriger Lösung über den Austausch der Wasser-Liganden im cis-[Cr(BigH)2(OH2)2]3+ (BigH = Biguanid, C2H7N5) durch 2.2′-Dipyridyl bzw. 1.10-Phenanthrolin (phen) unter Bildung von [Cr(BigH)2(AA)]3+ (AA = dipy bzw. phen) wurden spektralphotometrisch durchgeführt.
    Notes: Kinetic studies in aqueous solution on the replacement of the aqua ligands in cis-[Cr(BigH)2(OH2)2]3+ (BigH = biguanide, C2H7N5) by 2,2′-dipyridyl (dipy) and 1,10-phenanthroline (phen) forming [Cr(BigH)2(AA)]3+ (AA = dipy or phen) have been made spectrophotometrically. In both the cases the reaction proceeds by a path purely first-order with respect to the ligand. From the values of the rate constant at four different temperatures, values of the activation parameters, ΔH≠ and ΔS≠, have been evaluated for each system. The results are consistent with a mechanism involving outer-sphere association of the reactants followed by transformation of the outer-sphere complex in a dissociative process.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19764240114
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  • 16
    Electronic Resource
    Electronic Resource
    Oxofluorovanadates(V). I. Monooxopentafluorovanadates and monooxotetrafluorovanadates (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 251-254 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wird über die Darstellung der Monooxopentafluorovanadate(V) MI2VOF5 von Kalium, Ammonium und Åthylendiamin sowie der Monooxotetrafluorovanadate(V) MIVOF4 von Natrium, Pyridin, α Picolin, Chinolin, Guanidin, Äthylendiamin, α,α′-Dipyridyl und o-Phenanthrolin berichtet. Die Tetrafluoroverbindungen des Natriums, Chinolins und α,α′-Dipyridyl wurden IE-spektroskopisch charakterisiert (700-4000 cm-1), und bei (py · H)VOF4, (Chinolin · H)VOP4 und (α,α′-Dipyridyl · H2) (VOF4)2 wurde thermogravimetrisch unreines V2O5 als Endprodukt der thermischen Zersetzung an Luft beobachtet.
    Notes: The preparation of potassium, ammonium and ethylenediamine monooxopentafluorovanadates and of pyridine, α-picoline, quinoline, guanidine, ethylenediamine, α,α′-dipyridyl, o-phenanthroline and sodium monooxotetrafluorovanadates are reported. Infrared spectra of NaVOF4 · 0.7 HaO, (quinoline · H)(VOF4) and (α-α′-dipyridyl · H2) (VOF4)2 have been recorded (700-4000 cm-1). Thermogravimetric study up to 450°C of (pyridine · H)(VOF4), (quinoline H)(VOF4) and (α,α′-dipyridyl · H2)(VOP4)2 show that in all cases impure V2O5 is the ultimate product on heating.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713840309
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  • 17
    Electronic Resource
    Electronic Resource
    Boundary conformed co-ordinate systems for selected two-dimensional fluid flow problems. Part II: Application of the BFG method (1986)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 6 (1986), S. 529-539 
    Details
    ISSN: 0271-2091
    Keywords: Shallow Water Equations ; Boundary Fitted Grids ; Time Dependent Solution Domains ; Free Surface Problems ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper gives the results of an application of the SWEs (shallow water equations) to a part of the Hamburg harbour area, which is a complex flow domain, using the BFG approach, outlined in Part I. The results of a grid doubling procedure generating the desired computational grid from a coarse initial mesh are also presented. A second class of problems which is addressed, demands time-dependent co-ordinate systems. The problems which are solved are the free surface problem for a moving wave which eventually breaks and for a wave which is reflected by the solid walls of a rectangular basin.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650060804
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  • 18
    Electronic Resource
    Electronic Resource
    Boundary conformed co-ordinate systems for selected two-dimensional fluid flow problems. Part I: Generation of BFGs (1986)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 6 (1986), S. 507-527 
    Details
    ISSN: 0271-2091
    Keywords: Computational Fluids Dynamics ; Numerical Grid Generation ; Two-dimensional Fluid Flow Problems ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper the generation of general curvilinear co-ordinate systems for use in selected two-dimensional fluid flow problems is presented. The curvilinear co-ordinate systems are obtained from the numerical solution of a system of Poisson equations. The computational grids obtained by this technique allow for curved grid lines such that the boundary of the solution domain coincides with a grid line. Hence, these meshes are called boundary fitted grids (BFG). The physical solution area is mapped onto a set of connected rectangles in the transformed (computational) plane which form a composite mesh. All numerical calculations are performed in the transformed plane. Since the computational domain is a rectangle and a uniform grid with mesh spacings Δξ = Δη = 1 (in two-dimensions) is used, the computer programming is substantially facilitated. By means of control functions, which form the r.h.s. of the Poisson equations, the clustering of grid lines or grid points is governed. This allows a very fine resolution at certain specified locations and includes adaptive grid generation. The first two sections outline the general features of BFGs, and in section 3 the general transformation rules along with the necessary concepts of differential geometry are given. In section 4 the transformed grid generation equations are derived and control functions are specified. Expressions for grid adaptation arc also presented. Section 5 briefly discusses the numerical solution of the transformed grid generation equations using sucessive overrelaxation and shows a sample calculation where the FAS (full approximation scheme) multigrid technique was employed. In the companion paper (Part II), the application of the BFG method to selected fluid flow problems is addressed.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650060803
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  • 19
    Electronic Resource
    Electronic Resource
    Effect of open boundary condition on numerical simulation of three-dimensional hydrothermal behavior of Biscayne Bay, Florida (1981)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 1 (1981), S. 145-169 
    Details
    ISSN: 0271-2091
    Keywords: Numerical Model ; Estuary ; Open Boundary Condition ; Three dimensional ; Hydrothermal Biscayne Bay ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A three-dimensional time dependent free-surface model has been used to simulate the velocity and temperature distributions in Biscayne Bay, an estuarine basin in South Florida. Comparisons with tide gauge data and airborne infrared temperature data have been made. Analyses of three-dimensional velocity structure, phase relationships of velocity with depth and horizontal location have been conducted.One of the major concerns with three-dimensional models is the specification of conditions at open-boundaries, since it is rare that complete time dependent variations of variables at these boundaries are available. Two sets of approximate boundary conditions at the Biscayne Bay-Atlantic Ocean interface have been used for computations. It was found that specification of averaged surface height variation at open boundaries yield significantly better results than specification of estimated values of velocity.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650010205
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  • 20
    Electronic Resource
    Electronic Resource
    Orthogonal grid generation for Navier-Stokes computations (1998)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 28 (1998), S. 215-224 
    Details
    ISSN: 0271-2091
    Keywords: orthogonal grids ; hyperbolic grid generation ; Navier-Stokes equations ; higher-order methods ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Body conforming orthogonal grids were generated using a fast hyperbolic method for aerofoils, and were used to solve the Navier-Stokes equation in the generalized orthogonal system for the first time for time accurate simulation of incompressible flow. For grid generation, the Beltrami equation and the definition equation for the orthogonality are solved using a finite difference method. The grids generated around aerofoils by this method have better orthogonality than the results published by earlier investigators. The Navier-Stokes equation at Reynolds numbers of 3000 and 35 000 for NACA 0012 and NACA 0015 respectively, have been solved as an application. The obtained results match quite well with the corresponding experimental results. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 6 Ill.
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